エム・エムブリッジ List of Products and Services

The "Rumoi Ohashi" is a long bridge located at the terminal end of the Fukagawa Rumoi Expressway. The bridge features a mix of different types, including "narrow box girder bridge" and "plate girder bridge." The construction on the national road and land sections was carried out using a typical bent combined crane setup with 300t and 200t crawler cranes, while a special installation equipment, a 650t·m traveler crane, was used for the construction over the Rumoi River. Additionally, during the construction of the deck slab, a composite slab with a bottom steel plate that also functions as a formwork was erected using cranes, followed by the placement of rebar and concrete. 【Overview】 ■ Bridge length: 339m (span lengths of 46m + 94m + 55m + 55m + 58m + 29m) ■ Bridge type: 3-span continuous narrow box girder + 3-span continuous minor girder bridge (mixed bridge) ■ Factory fabrication weight: 1,022.1t ■ Factory painting area: 14,750m2 ■ Transportation weight: 1,195.5t *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

In October 2019, Typhoon No. 19 caused the Tama River to swell, eroding the foundation of the Hino Bridge's pier, resulting in a 70 cm subsidence of one of the piers. This led to a bent condition of the bridge section, creating a step in the road surface that rendered it impassable. This project is an emergency restoration work to remove the subsided pier and the bent bridge girder, and to fabricate and install a new girder. Nishimatsu Construction Co., Ltd. began the construction yard preparation work at the end of November of the same year, and our company started on-site work for the bridge replacement on January 20. Subsequently, the existing bridge was removed at the end of February, the new bridge was installed in March, and the bridge surface work progressed in April, allowing us to lift the traffic ban on May 12, 2020. [Summary] - The Tama River swelled due to the typhoon, eroding the foundation of the Hino Bridge's pier, causing a 70 cm subsidence of one pier and rendering the road impassable due to a step in the surface. - Emergency restoration work was carried out to remove the subsided pier and the bent bridge girder, and to fabricate and install a new girder. - The traffic ban was lifted on May 12, 2020. *For more details, please refer to the PDF document or feel free to contact us.*

• Bridge Construction

The "Tokuda Bridge" was constructed in 1962 and has significantly deteriorated, with repeated traffic restrictions due to repair work, as well as a narrow road that makes it difficult for vehicles to pass each other and poor alignment leading to frequent traffic accidents. The new bridge will have a roadway that is 2 meters wider, with sidewalks on both sides, alleviating the feeling of constriction and allowing everyone to pass safely. Additionally, by eliminating traffic restrictions caused by traffic accidents and rising river levels, it is expected to be used as a vital route for the Morioka metropolitan area. 【Overview】 ■ Bridge Type: Steel 6-span continuous composite narrow box girder bridge ■ Bridge Length: 365.00m ■ Girder Length: 363.90m ■ Live Load: B live load, crowd load ■ Corrosion Protection Method: Weather-resistant steel (Friction joint surface: Coated with inorganic zinc-rich paint) *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

The "Dojima Ohashi" is a lower arch bridge with Italian Romanesque style bridge piers that was completed in 1927 (Showa 2). Ninety years have passed since its completion, and significant deterioration has occurred. Additionally, due to years of ground subsidence, the space under the girders has become lower, hindering navigation. As a result of inspections and diagnostics, a full-scale renovation project has been initiated. The project aims to extend the lifespan of the bridge and secure navigational space, while preserving the relatively sound lower bridge piers and upper arch components to maintain its historical and cultural value. The deck and flooring are being completely replaced. 【Construction Details】 ■ The upper structure will have all components removed and replaced except for the arch elements, and the passage will be secured by switching it according to the progress of the construction. ■ To carry out the work while ensuring navigational space, the waterway will be divided into two sections on the right and left banks, and the navigation route will be adjusted according to the construction site. *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

We would like to introduce the "Fukuoka No. 208 Chikugogawa Bridge Superstructure (P4-P8) Construction." The Chikugogawa Bridge is a long bridge spanning the Chikugo River with a length of 450 meters and a maximum span of 170 meters, featuring two arches. Its horizontal design and gentle arch curves create a lightness as it gracefully crosses the river, harmonizing with the spacious surrounding landscape. Additionally, it is constructed as a "steel arch bridge," allowing for lower pier heights on the de Reike embankment, thereby reducing the sense of pressure. The construction method involves a crane erection method that uses temporary support materials called bent to connect the bridge girders. For the erection between P5 and P6, a special jack is used to gradually advance the bridge girder forward, employing a launching erection method. 【Bridge Specifications】 ■ Bridge Type: Steel 4-span continuous (2-span) single-arch bridge ■ Bridge Length: 450m ■ Arch Spans: 170m, 153m ■ Arch Rise: 30m, 27m ■ Width: 20.5-21.4m ■ Total Weight: 6465t *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

We would like to introduce the construction case of M.M. Bridge Co., Ltd. With the extension of the Sanriku Coastal Road, the Tadakoshi Bridge, which was bending towards National Route 45, was replaced to face the direction of the Kesennuma No. 2 Tunnel (tentative name) by implementing the "replacement of the Tadakoshi Bridge." The existing girders were cut at both ends and moved horizontally, and the newly constructed girders assembled on the support were also moved horizontally and connected. For detailed information about the case, please refer to the related catalog. [Overview] - Until now, the Sanriku Coastal Road has connected to National Route 45, and the bridge was bending towards Route 45. - With the extension of the Sanriku Coastal Road, the bridge will become straight. *For more details, please refer to the PDF materials or feel free to contact us.

• Bridge Construction

The "Daiichi Shirakawa Bridge" suffered significant damage due to the Kumamoto earthquake in 2016, including displacement and deformation of the bridge structure. As a result, the damaged old bridge will be removed, and reinforcement will be carried out on the damaged parts of the substructure, followed by the construction of a new bridge. The design of the new bridge is based on the form and span arrangement of the old bridge, with the aim of making its appearance as similar to the old bridge as possible. Additionally, the removal of the old bridge and the construction of the new bridge will employ the "cable crane direct suspension method." 【Construction Overview】 ■ Project Name: Daiichi Shirakawa Bridge Restoration Work ■ Project Details: From the removal of the old bridge to the construction of the new bridge, including the reconstruction of piers and abutments ■ Bridge Type: Spandrel-braced balanced arch 　・ Bridge Length: 152.15m / Span Length: 30.44m + 90.27m + 30.44m ■ Steel Weight: Old Bridge 619.1 tons (excluding bearings) / New Bridge 635.9 tons (excluding bearings) *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

The "First Shirakawa Bridge" suffered numerous deformations and fractures in its supporting components due to the Kumamoto earthquake in 2016, resulting in a decrease in strength. To restore this railway line and once again enjoy the beautiful scenery, it became necessary to construct a new bridge. This beautiful bridge, which has a rich history, will be carefully designed to maintain its appearance as much as possible while being transformed into a safe and secure structure using new technology. MMB is committed to delivering that breathtaking view back to many hearts and is cooperating on the bridge replacement project with the aim of a swift restoration. 【Main Design Loads】 ■ Train Load: EA-15 ■ Design Speed: 70 km/h ■ Earthquake Load: L1 seismic motion, L2 seismic motion ■ Dam Water Level: During water retention tests and design flood conditions (considering water pressure and buoyancy) *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

We would like to introduce a case of "bridge removal" by M. M. Bridge. The highway was closed, and after supporting the bridge with a special trailer equipped with jacking equipment, the bridge was cut. It was then transported to a community ground that served as the work yard and crushed using a concrete crusher. The work involved the use of special construction machinery, including a "mobile multi-axle trailer" developed for transporting super-heavy objects, a "240t stage jack" that excels in horizontal load resistance, and a "large hydraulic crusher" capable of easily crushing large structures. [Overview] ■ The highway was closed, and after supporting the bridge with a special trailer equipped with jacking equipment, the bridge was cut. ■ It was transported to a community ground that served as the work yard and crushed using a concrete crusher. *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction
• Dismantling and moving

We would like to introduce the construction of the "Bridge that does not stop people or rivers (Okouchi Bridge)." In the examination of the bridge type, it was determined that due to the presence of river structures in the Abe River, it was difficult to install intermediate piers. Therefore, the Nielsen-Lowes bridge, which is suitable for a span of approximately 165 meters, was selected. The Nielsen-Lowes bridge features a truss structure formed by arch members and stiffening girders supported by diagonally placed cables, providing higher rigidity compared to other types of arch bridges and allowing for longer spans. 【Bridge Overview】 ■ Type: Steel Simple Nielsen-Lowes Bridge ■ Bridge Length: 165.5m (Girders Length 164.0m) ■ Girder Height: (Arch Rise) 26.0m ■ Abutment Type: RC Inverted T-shaped Abutment ■ Foundation Type: Cast-in-place Pile Foundation *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

At M.M. Bridge, we are constructing a "bridge that opens up the waterfront" to enhance pedestrian convenience and serve as a hub and junction for circulation. First, we will assemble the steel girder at the yard in front of the post office, above the Sakuragicho entrance intersection. Then, we will perform connection work to install the assembled steel girder all at once. After that, we will assemble a multi-axle dolly to install the assembled steel girder at the designated location. 【Multi-Axle Dolly Movement STEP】 ■ Diagonally avoid the curb (obstacle) 　↓ ■ Pass straight through the curb 　↓ ■ Diagonally move to the designated position *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction
• Road construction

At M.M. Bridge, we are constructing a "bridge that opens up the waterside" as a hub and node for pedestrian convenience. To minimize traffic regulations that may inconvenience nearby residents, we are implementing construction using very specialized and high-difficulty methods within a limited construction yard. We will transport bridge girders assembled in the construction yard using multi-axle transport vehicles and carry out major tasks such as sending bridge girders assembled on the girders out over the Ooka River during limited nighttime closures. 【Bridge Overview】 ■ Bridge Type: 4-span continuous rigid-frame steel deck box girder bridge + simple rigid-frame steel deck box girder bridge ■ Bridge Length (Deck Section 4 Spans): Total length 194m ■ Span Length (Deck Section 4 Spans): P1 to P3 68m + 50m / P2 to CP2 41m + 20m ■ Total Width (Deck Section): Route A 6.5m / Route B 4.6m / Route C 3.1m *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction
• Road construction

The "Yokohama Circular North Line" is a dedicated highway that connects the "Kohoku Interchange" of the Third Keihin Expressway to the "Namamugi Junction" of the Yokohama Bay Bridge, forming the northern section of the Yokohama Circular Road, which is the backbone of the Yokohama City transportation network. In our construction section, in addition to the main bridge section directly above the Yokohama Bay Bridge, we are also constructing and erecting ramp bridges that connect from the "Kinkou Junction" area to the Bay Shore Line and the Third Keihin Expressway. To minimize road closure times, we transport large bridge girders assembled within a limited area to the designated location using a multi-axle trailer with 96 wheels, and then they are erected all at once by a super-large crane that self-propels to the same designated location. 【Project Overview】 ■ Route Name: Yokohama Circular North Line ■ Construction Period: September 1, 2011 - October 29, 2015 (at the time of contract) ■ Construction Location: 1st and 2nd Chome, Namamugi, Tsurumi Ward, Yokohama City *For more details, please refer to the PDF document or feel free to contact us.

• Road construction

The "Toga Ohashi" is located in Toga Village, Nanto City, spanning the first-class river Shogawa (the dam lake of Komaki Dam) and is a steel arch bridge of the through arch type. The arch section of this bridge is primarily composed of pipes with a diameter of 1 meter. The pipes are manufactured (pipe formation) by gradually bending steel plates using a press machine. The maximum plate thickness of the pipes is 93mm (at the base of the arch of Pier P3), and the thickness decreases towards the top. A press machine weighing 10,000 tons was used to press the pipes at intervals of about 40mm, gradually shaping them into a perfect circle. 【Overview of the Superstructure】 ■ Type: Steel through arch bridge ■ Bridge length: 368.0m ■ Span lengths: 27.2m + 28.0m + 205.0m (arch 190.0m) + 36.0m + 36.0m + 34.2m ■ Road width: 8.5m to 9.5m ■ Steel weight: Approximately 1,725t ■ Scope of work: Factory production, erection, on-site painting, composite deck slab, bridge accessories work, painting work *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

The "Toga Dam Shokawa Bridge Superstructure Construction" is being developed as a construction access road for the Toga Dam project, and it involves the construction of a bridge that crosses the first-class river Shokawa, starting from National Route 156. The arch base, bridge pier base, and each bridge pier are integrated with concrete in a rigid structure that can withstand significant earthquakes. A highly durable composite deck is used for the floor slab. Additionally, the stiffening girder and composite deck of the arch section were erected using a cable crane, while a crawler crane was used for other sections. 【Bridge Overview】 ■ Type: Steel through arch bridge ■ Bridge Length: 368.0m ■ Span Length: 27.2m + 28.0m + 205.0m (Arch 190.0m) + 36.0m + 36.0m + 34.2m ■ Road Width: 8.5m to 9.5m ■ Steel Weight: Approximately 1,725t *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

MM Bridge Co., Ltd. is conducting the upper structure construction of the Togadama Shokawa Bridge. This construction is being developed as a construction road for the Togadama Dam project. The work involves the bridge that crosses the first-class river Shokawa, starting from National Route 156, and this road is planned to become the Togabypass of National Route 471 in the future. 【Features】 - The arch section construction adopts the cable erection inclined suspension method. - Emphasis is placed on harmonizing with the surrounding environment while considering economic efficiency. - A rigid structure where each pier and crossbeam are integrated with concrete. - Connected by a beautifully red and elegant pipe arch that stands out in the picturesque valley. - Erected with large blocks. *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

The upper construction work of the Togadama Shokawa Bridge is being carried out as part of the living-related road construction project for the Togadama Dam construction project. The road starts from National Route 156 and crosses the first-class river Shokawa with a bridge, and this road is planned to become the Togabypass of National Route 471 in the future. Steel plates are bent into pipe shapes using press machinery, and the ends of the pipes are processed using special processing machines. 【Features】 ■ Pipe truss form using ultra-thick steel plates ■ A working environment that ensures safety even at high altitudes ■ Two companies with abundant experience combine their accumulated technical skills ■ A beautiful red and elegant pipe arch that stands out against the stunning valley ■ A strong and durable bridge that connects to the future *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

MM Bridge Co., Ltd. is currently carrying out widening work on the Sasebo Viaduct. The Sasebo Viaduct, located on National Route 497 and the Nishi-Kyushu Expressway, is a dedicated roadway approximately 3 km from Sasebo Station towards the sea and is situated on a main road in the city. This improvement work is expected to enhance traffic safety, strengthen functionality (alternative functions for disaster prevention, regional revitalization, and improved convenience), and alleviate congestion. 【Features】 ■ Widening of the bridge pier and beam through a composite structure of concrete and steel materials ■ Installation using large cranes in a single operation ■ Installation using gate equipment in a single operation *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

The highway renewal project aims to maintain the functionality of the highway network over the long term by minimizing the life cycle costs of the main structures of the highway and implementing necessary measures from the perspectives of preventive maintenance and performance enhancement. In this project, the deteriorated reinforced concrete slabs, which had progressed to cracking and delamination, were replaced with more durable precast PC slabs. Typically, construction would involve road closures; however, to minimize the impact of traffic congestion caused by the construction, the slabs were divided into three sections, and the work was carried out using lane restrictions. **Features** - Replacement of slabs divided into three widths - Lane switching using movable protective barriers - Traffic congestion monitoring and information dissemination - Maintaining the flow of the highway even within limited time and space - Noise reduction measures considering the surrounding environment *For more details, please refer to the PDF materials or feel free to contact us.*

• Road construction

MM Bridge Co., Ltd. is engaged in the construction of bridges connecting the Sanriku Coastal Road. We are advancing our plans based on local voices and the insights of experts. Our designs are resilient against earthquakes and tsunamis of the scale of the Great East Japan Earthquake. We also ensure safety and wind resistance against large typhoons. The shape and color of the bridges are designed with consideration for harmony with the landscape. 【Features】 ■ Special and highly challenging bridge design ■ High-difficulty work at sea ■ Anti-corrosion measures for susceptible areas ■ A combination of the technical skills and experience of three companies ■ Vibration control measures for cables *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

MM Bridge Co., Ltd. is constructing a bridge that connects the Sanriku Coastal Road. The Kesennuma Bay Crossing Bridge (tentative name) is a cable-stayed bridge with a total length of 680 meters, spanning across Kesennuma Bay as part of the Sanriku Coastal Road. The main tower stands 115 meters above sea level, and the distance between the two main towers (span length) is 360 meters, making it one of the longest bridges in Japan. Of the two main towers, one on the A2 pier side is located within Kesennuma Bay, and the main tower and the 346 meters of main girder between them will be constructed by the MMB, Miyachi, and Kawada joint venture as part of the upper structure work in the Koko-shio area. [Bridge Overview (Excerpt)] ■ Route Name: Sanriku Coastal Road / Sanriku Vertical Road ■ Road Standard: Type 1, Class 3 (B live load) ■ Design Speed: V = 80 km/h ■ Bridge Type: 3-span continuous steel cable-stayed bridge *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

Our company has been conducting research and demonstration experiments in collaboration with institutions such as the University of Tokyo, coral research organizations, anti-corrosion technology specialists, and local businesses. Since 2007, we have installed four "coral growth shelves" on the seabed in the area known as the sea of the sea urchin reef in Ishigaki Island. We created shelves with no electric current and shelves with three different strengths of electric current to investigate whether there would be differences in coral growth. As a result, we confirmed that corals grew explosively in a weak electric field of 50–100 mA/m². It was particularly noted that the growth of branching corals such as Acropora tenuis was rapid. 【Experiment Overview】 ■ Content - Four coral growth shelves were installed on the seabed. - Shelves with no electric current and shelves with three different strengths of electric current were created. - Investigated whether there would be differences in coral growth. ■ Results - Corals grew explosively in a weak electric field of 50–100 mA/m². - The growth of branching corals such as Acropora tenuis was rapid. *For more details, please refer to the PDF document or feel free to contact us.

• Other services and technologies

At M.M. Bridge Co., Ltd., we are constructing the "Sakura Mirai Bridge." To minimize traffic regulations that may inconvenience nearby residents, we are using a very specialized and high-difficulty construction method within a limited yard. We transport bridge girders assembled in the construction yard using multi-axle transport vehicles, and we perform large-scale operations to send out girders assembled on the bridge deck over the Ooka River during limited hours of nighttime road closures. [Bridge Design] - A simple structure that opens up the waterfront as part of the open shoreline. - Bright colors that harmonize with the surrounding scenery, including the new city hall. - Consideration for the river environment by not installing bridge piers within the river. *For more details, please refer to the PDF materials or feel free to contact us.*

• Bridge Construction

Our company has formed a consortium of eight companies from different industries for a project with the National Research and Development Agency for New Energy and Industrial Technology Development, and has been developing an "air turbine wave power generation device." In the fiscal year 2015, we installed a demonstration device at Sakata Port in Yamagata Prefecture, and as a result of the field verification, we have established a prospect for practical application. Moving forward, we will continue to contribute to environmentally conscious national development through renewable energy. 【Features】 ■ Formed a consortium of eight companies from different industries ■ Installed a demonstration device at Sakata Port in Yamagata Prefecture ■ Established a prospect for practical application based on field verification results *For more details, please refer to the PDF materials or feel free to contact us.

• Power generation equipment
• Other services and technologies

Our company has developed a coral growth device that utilizes an electric substrate that facilitates the attachment of juvenile corals and a weak electric current that promotes the growth of attached corals. We have been conducting monitoring surveys through demonstration tests for over 10 years. The results of the demonstration tests confirmed the effectiveness of the electric substrate in promoting the attachment of juvenile corals and enhancing coral growth. Moving forward, we will work towards the regeneration of reef-building corals and the creation of a source for coral eggs by providing a system that combines these elements. [Technical Overview] ■ Developed Device: Coral Growth Device ■ Survey Content: Monitoring through demonstration tests ■ Survey Results: Confirmation of the effectiveness of the electric substrate in promoting the attachment and growth of juvenile corals *For more details, please refer to the PDF document or feel free to contact us.

• Other services and technologies

Our company has developed an analytical method to reproduce the behavior of bridges when subjected to tsunami effects by applying insights gained from reproduction experiments using a scaled bridge model during tsunami actions, conducting wide-area tsunami propagation analysis (2D tsunami analysis), and 3D tsunami analysis that includes the seabed, topography, and structures. It will be possible to simulate tsunamis caused by anticipated massive earthquakes in the future and utilize this for disaster prevention studies of infrastructure, including bridges. So far, we have conducted reproduction calculations of previous hydraulic experiments targeting bridge superstructures and tsunami reproduction analyses focused on thermal power plants affected by the tsunami from the Great East Japan Earthquake. By comparing the experimental results and actual damage situations, we are verifying the applicability of numerical fluid analysis for evaluating tsunami wave forces acting on various structures. **Features** - Application of insights gained from reproduction experiments using a scaled bridge model during tsunami actions - Ability to estimate damage and consider countermeasures - Useful for disaster prevention studies of infrastructure, including bridges *For more details, please refer to the PDF document or feel free to contact us.*

• Analysis and prediction system
• Scientific Calculation and Simulation Software

The "upright floating breakwater" is a new type of breakwater that quickly rises from the seabed during a tsunami or high waves to protect people and ports from disasters. During normal times, it is stored on the seabed, so it does not obstruct the passage of vessels or the flow of seawater. The Chubu Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism, the Port and Airport Research Institute, and a private group including our company collaborated on the technical development. Through large-scale hydraulic model experiments and verification of technology in real sea area demonstration experiments, trial construction began in the Kainan area of Kushimoto Port, Wakayama Prefecture in fiscal year 2011, with the main construction starting in fiscal year 2012 and completion in fiscal year 2014. [Mechanism of the Breakwater] - During normal times, a smaller upper steel pipe is stored inside a lower steel pipe installed on the seabed. - When a tsunami or high waves approach, the upper steel pipe rises within a few minutes to become the breakwater. *For more details, please refer to the PDF materials or feel free to contact us.

• Coastal construction
• Other services and technologies

The "floating breakwater" is a structure that reduces the energy of waves concentrated near the sea surface through wave-dissipating functions such as reflection, disturbance, or absorption by a floating body. Since it is moored using chains and anchors, it is advantageous in terms of cost-effectiveness and construction in deep water and soft ground. The product constructed by our company features an internal water flow vibration-type cross-sectional shape, which reflects incident waves due to the phase difference between the incident waves and the floating body’s oscillation. The cross-section of the floating body has a structure with a long waterway that is curved. [Features] ■ Internal water flow vibration-type cross-sectional shape ■ Reflects incident waves due to the phase difference between the incident waves and the floating body’s oscillation ■ The cross-section of the floating body has a structure with a long waterway that is curved *For more details, please refer to the PDF materials or feel free to contact us.

• Other services and technologies
• Special Construction Method

We would like to introduce the 'MS Board,' a technology developed by our company to realize a floating dock that is resistant to swaying. By creating a slight gap between the fins and the floating body during installation, the kinetic energy of the waves approaching from the wave side is converted into vortex motion as it passes through the gap, allowing for energy absorption and dissipation. In the renovation project of the floating dock at Majima Fishing Port, we reduced the swaying to 1/10 of that of the existing floating dock. 【Features】 ■ Realizes a floating dock that is resistant to swaying ■ Creates a slight gap between the fins and the floating body during installation ■ Converts the kinetic energy of waves approaching from the wave side into vortex motion as it passes through the gap ■ Absorbs and dissipates energy *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Materials
• Other services and technologies

"3D measurement" is a measurement technology that allows for non-contact, rapid three-dimensional shape measurement by irradiating a structure with laser light and obtaining three-dimensional geometric information from the measurement of the reflected light intensity. When adding new structures to existing ones, it is crucial to accurately understand the current state of the existing structures, while also minimizing road restrictions and reducing social losses as much as possible. This technology can perform measurements of existing structures while keeping road restrictions to a minimum, and it has been successfully applied in multiple junction construction projects. [Features] - Significantly reduces the time required for data acquisition - Enables measurement of existing structures while minimizing road restrictions - Proven application in multiple junction construction projects *For more details, please refer to the PDF document or feel free to contact us.

• Other measuring instruments
• Measurement and analysis equipment leasing and rental

The vibrations caused by constant micro-movements and vehicle drop tests are easy to measure but have small amplitudes, making it difficult to accurately grasp the vibration characteristics. Therefore, when adopting a new bridge design, it is necessary to confirm the vibration characteristics under large amplitudes. Recently, we conducted verification experiments using our large shaker to evaluate the vibration characteristics under large amplitudes for compact cross-section bridges and cable-stayed bridges. Please feel free to consult us when needed. *For more details, please refer to the PDF materials or feel free to contact us.

• Other measuring instruments
• Measurement and analysis equipment leasing and rental

The characteristics of wind acting on bridges vary depending on the construction site, so it is important to examine these characteristics in advance for a rational wind resistance assessment. Depending on the construction site and planned height, we offer methods for examination on paper, methods using numerical flow analysis, and methods for quantitative examination using topographical models in wind tunnel experiments. Additionally, with the support of Mitsubishi Heavy Industries, Ltd., which has one of the largest wind tunnel testing facilities in Japan, we can conduct highly accurate "3D wind tunnel experiments." Furthermore, a simplified wind tunnel testing tool called "Super-VFD" has been developed, enabling reliable wind resistance assessments to be conducted quickly and cost-effectively without compromising overall accuracy. 【Features】 <Wind Environment Assessment> ■ Methods for examination on paper based on the construction site and planned height ■ Methods for examination using numerical flow analysis ■ Methods for quantitative examination using topographical models in wind tunnel experiments *For more details, please refer to the PDF document or feel free to contact us.

• Structural Survey
• Environmental Survey
• Other services and technologies

With the elongation of bridges, bridge girders and main towers are more likely to experience vibrations due to wind. The "TMD (Tuned Mass Damper)" is a vibration control device that attaches a weight to vibrating structures and suppresses the structure's sway by oscillating the weight. It has a proven track record in bridge girders and main towers at sea, providing total engineering from design and construction to maintenance. 【Features】 ■ A vibration control device that attaches a weight to vibrating structures and suppresses the structure's sway by oscillating the weight. ■ Proven track record in bridge girders and main towers. ■ Provides total engineering from design and construction to maintenance. *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-proof and vibration-damping equipment
• Vibration isolation, vibration control, and earthquake resistance construction

The "Dampers Brace" is a steel damper developed with the aim of absorbing seismic energy, featuring an axial yield type design. The core material is restrained by components that prevent buckling during axial compression, allowing for stable repeated plastic deformation in both tension and compression directions, which results in high hysteretic damping performance. This hysteretic damping absorbs seismic energy. It is possible to significantly reduce the forces acting on the main components of bridges. By adopting this product, the necessary seismic performance can be achieved efficiently and economically compared to conventional seismic reinforcement designs. 【Features】 - The reduction in seismic countermeasure weight can significantly lower manufacturing costs and vertical reactions, making it economical. - It can reduce the horizontal seismic reactions from the superstructure to the substructure. - It allows for a smaller scale of substructures, which is economical. - It is applicable to both new bridges and seismic reinforcement of existing bridges. *For more details, please refer to the PDF materials or feel free to contact us.

• Bridge Materials
• Bridge Construction
• Earthquake-resistant construction method

Our company is conducting research and development in collaboration with Mitsubishi Heavy Industries and its affiliates to apply Phased Array Ultrasonic Testing (PAUT), which has been developed in the medical field and is utilized in power generation areas such as nuclear power plants, to the field of bridges. We have developed an automated scanning system using PAUT aimed at simultaneously inspecting deck propagation cracks and weld bead propagation cracks. Through trials on small test specimens and actual bridges, we have developed a technology to detect cracks in the early stages of crack propagation. 【Inspection device capable of accurate detection and evaluation using Phased Array Ultrasonic Method】 <Overview> ■ Automatically travels while adhering with magnets, simultaneously inspecting from both the deck side and U-rib side in the direction of the weld line. ■ Data is linked with inspection location information, allowing results to be reproduced in software. ■ Capable of detecting cracks of approximately 2 to 3 mm in the U-rib welds of steel deck slabs. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection
• Structural Survey

We would like to introduce our "Maintenance, Renewal, and Preservation Technology." Our company is engaged in extending the lifespan and renewal of road infrastructure through advanced inspection and diagnostic technologies, in addition to the bridge construction techniques we have cultivated over many years. We carry out inspections, diagnostics, and reinforcements of steel bridges, as well as large-scale steel girder improvement technologies and construction using refreshing techniques for suspension materials. Additionally, we systematically implement a series of measures for the longevity work on the important cultural property, Eitai Bridge, and for bridges that have suffered fatigue damage, including confirming the extent of damage, investigating the causes of damage, implementing countermeasures, and verifying the effectiveness of those measures. 【Our Technologies】 ■ Inspection, diagnosis, and reinforcement of steel bridges ■ Large-scale steel girder improvement technology ■ Refreshing technology for suspension materials ■ Longevity work on the important cultural property, Eitai Bridge ■ Repair and reinforcement technology for bridges suffering from fatigue damage *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction

We would like to introduce our "special construction technology." Our company's field varies greatly, including urban expressway junctions, main roads, railways, steep mountain areas, and rich natural river environments. In these locations, it is essential to minimize the impact on people's lives and the natural environment while advancing construction. We utilize various construction methods and have consistently focused on the development of special construction technology through integrated design, construction planning, and on-site efforts to meet social demands. Additionally, to enable these special construction technologies, we are also focusing on the development of specialized equipment through joint development with jack manufacturers. 【Examples of Construction】 ■ Launching Construction - Rapid launching construction using jointly developed equipment - On-site assembly in tunnels followed by launching construction ■ Traveler Crane Construction - Bent construction with cranes installed on girders - Cantilever construction without placing a bent in the river *For more details, please refer to the PDF materials or feel free to contact us.

• Bridge Construction

The "Rapid Three-Dimensional Construction Technology (Suisui MOP)" is a technology for converting intersections in urban areas with heavy traffic congestion into grade-separated crossings in a short period of time. In conventional construction methods, traffic congestion can worsen due to the construction work, but this method can minimize traffic congestion during construction. By adopting the "Modular Girder Method" and the simultaneous construction technology for superstructure and substructure using the "Pier Column Pre-Construction Method," significant reductions in construction time are achieved. 【Features】 ■ Adoption of the Modular Girder Method and simultaneous construction technology for superstructure and substructure ■ Significant reduction in construction time ■ Ensures right-turn lanes during construction ■ Reduces traffic congestion associated with construction ■ No need for new assembly land as part of the existing road is utilized as an assembly yard *For more details, please refer to the PDF materials or feel free to contact us.

• Bridge Construction

We would like to introduce our "Space-Saving Urban Construction Technology." Bridge construction in densely populated urban areas is subject to limited yard space and construction time, requiring work to be carried out under many constraints. To overcome such stringent construction conditions, innovative thinking that breaks away from conventional concepts is essential. Our company possesses erection technology that meets these needs, one example being the modular girder method, which involves folding out the cantilever brackets. Using this modular girder method, we have achieved urban construction in narrow spaces with strict time constraints. [Features] ■ Possession of erection technology using the modular girder method with folding cantilever brackets ■ Achievement of urban construction in narrow spaces with strict time constraints ■ Extensive track record of erection using dollies as a technique to erect bridge girders overnight *For more details, please refer to the PDF materials or feel free to contact us.

• Bridge Construction

We would like to introduce our company's "Long-Span Bridge and Large-Scale Bridge Construction Technology." Starting with the Kanmon Bridge, we have been involved in the construction of long-span bridges such as the Akashi Kaikyō Bridge, the Tatara Bridge, and more recently, the Megami Bridge and the Shinminato Bridge. Our company possesses a wealth of know-how in the construction of long-span bridges. Techniques such as cable crane erection and floating crane erection are employed in special environments, such as straits, estuaries, and steep mountainous areas. With the expertise we have cultivated over many years, we achieve high-precision bridge construction. 【Construction Examples】 ■ Large Block Erection ■ Balancing Erection ■ Direct Hanging Erection ■ Cable Crane Erection ■ Floating Crane Erection *For more details, please refer to the PDF materials or feel free to contact us.

• Bridge Construction

We would like to introduce our company's initiatives in the PPP and PFI business. As a comprehensive engineering company, we are engaged in PPP and PFI projects under public-private partnerships to provide high-quality public services that respond to various changes in social environments through infrastructure technologies such as roads and ports. We are committed to contributing to comfortable living in communities. We manage the entire business from planning and design to construction, operation, and management. [Our Initiatives] ■ Comprehensive management of local roads - Integrated road maintenance - Pedestrian bridge refresh ■ Park renewal and management - Community-integrated parks - Multifunctional and disaster prevention base parks *For more details, please refer to the PDF materials or feel free to contact us.

• Other Management Services
• Facility Design

We would like to introduce our initiatives regarding the environment. A significant portion of the energy that enriches our lives relies on fossil fuels, which emit large amounts of greenhouse gases. As a result, it is said to contribute to global warming and rising sea temperatures. Our company is engaged in the development of technology to propagate corals that are threatened by rising sea temperatures, as well as in the development of wave power generation, which is one form of clean energy. [Our Initiatives] ■ Coral Restoration and Growth Promotion Technology - Applying technology used in coastal structures to coral restoration and growth, contributing to environmental conservation. ■ Wave Power Generation - Developing technology to generate electricity using the power of waves. *For more details, please refer to the PDF document or feel free to contact us.

• Other power generation

We would like to introduce our company's work on "disaster prevention." The Great East Japan Earthquake caused significant damage not only from the shaking of the earthquake but also from the tsunami. Our company is engaged in the development and research of products that protect lives from the damage caused by massive earthquakes. Technologies include "Damper Brace," which suppresses the shaking from earthquakes through the hysteretic damping performance of steel's plastic deformation; a special type of breakwater called "Vertical Floating Breakwater," which does not obstruct ship traffic and only rises when needed; and "Tsunami Simulation," which verifies the impact of massive tsunamis on structures through numerical simulation. [Disaster Prevention Technologies] ■ Damper Brace - A vibration control technology that suppresses shaking from earthquakes using the hysteretic damping performance of steel's plastic deformation. ■ Vertical Floating Breakwater - A technology for a special breakwater that does not obstruct ship traffic and only rises when needed. ■ Tsunami Simulation - A technology that verifies the impact of massive tsunamis on structures through numerical simulation. *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-resistant construction method
• others

We would like to introduce the "coastal structures" that we handle. Utilizing the shipbuilding technology we have cultivated so far, we manufacture and construct structures that can float or sink in the sea. We have a track record of producing hybrid floating piers that effectively use steel and concrete for weight reduction, barrier-free floating piers designed with consideration for people by suppressing wave motion, and lightweight caissons that effectively use steel and concrete. [Examples of Manufacturing and Construction] ■ Hybrid Floating Pier ■ Barrier-Free Floating Pier ■ Hybrid Caisson ■ Steel Caisson ■ Floating Breakwater ■ Sunken Caisson *For more details, please refer to the PDF materials or feel free to contact us.

• others

We would like to introduce the "bridges" that our company handles. We work on long-span bridges, highway bridges, pedestrian decks, and also engage in important cultural property repairs, bridge refreshment, and seismic reinforcement to protect bridges. Our company manufactures and constructs a variety of bridges that can contribute to society in various situations, and we also provide maintenance. 【Bridges we handle】 ■ Long-span bridges: Bridges that span straits and gorges ■ Highway bridges: Bridges that help improve logistics efficiency ■ General road bridges: Essential bridges for our daily lives ■ Pedestrian bridges: Bridges that enhance pedestrian convenience and protect people from traffic accidents ■ Railway bridges: Bridges that support the railway network *For more details, please refer to the PDF document or feel free to contact us.

• Bridge Construction