横山基礎工事 List of Products and Services

The "LIBRA Method" is a temporary bridge and cantilever construction method that simplifies the securing of pile alignment by using upper steel panels as guides for pile driving, eliminating the need for scaffolding until the upper structure is erected, and streamlining the complex reinforcement of bridge piers on sloped terrain. Since high-altitude work is not required, it ensures safety while reducing work time. It is often adopted as part of national resilience initiatives and has a wealth of experience in construction access roads and work platforms for the expansion of highways to four lanes, as well as disaster recovery projects. 【Features】 - Enables parallel work on upper and lower structures, reducing waiting time and shortening processes. - The connection points of the newly installed panels to the pile bridge piers serve as guides for steel pipe installation, eliminating the need for dangerous guide material installation work. This improves safety while also reducing changes to the natural terrain and minimizing deforestation, thereby lessening the impact on the natural environment. - Drilling and installation can proceed simultaneously, allowing for stable construction from soft ground to hard ground. - Adaptable to various site conditions such as steep slopes in mountainous areas, rivers, dams, ports, and urban civil engineering. *For more details, please refer to the materials. Feel free to contact us with any inquiries.*

• Bridge Construction

The "Super Deck" is a modular spud barge applicable for heavy machinery scaffolding for water construction in inland areas such as dams, rivers, and lakes. The installation and removal of steel materials led to decreased efficiency in water construction, and the high material costs for large crane work platforms contributed to rising construction costs. The development of the modular barge allows for immediate application to construction upon completion of transportation, assembly, outfitting, and inspection, which is expected to improve labor efficiency, safety, and cost-effectiveness. 【Features】 ■ The barge can be transported by trucks with a payload capacity of 15t or 10t. ■ After the barge transportation, assembly, and outfitting are completed, it can be immediately applied to construction. ■ All assembly, disassembly, outfitting, and release work can be done on the float, significantly reducing the risks associated with working at heights. ■ The time required for assembly, disassembly, outfitting, and release is short. ■ The standard specification allows for the installation of a 200t hydraulic crawler crane. *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method

The "Narrow Space Clearance Construction Method" is a machine configuration that combines a narrow space-compatible drilling machine, modified from the specifications of a full-rotation all-casing general-purpose machine, with a hydraulic telescopic boom crawler and a hydrograb. This design minimizes the occupied area and adapts the machine for pile construction in confined spaces. The standard working space for a φ1500mm class drilling machine is more than 160m2, with a width of 8m, a length of 20m, and a headroom height of over 5.5m. 【Features】 ■ Capable of various pile construction in narrow spaces ■ Low vibration and low noise during casing drilling ■ All main machines are hydraulically driven ■ The combination of the narrow space-compatible drilling machine, hydraulic telescopic boom crawler, and hydrograb allows for construction under headroom restrictions of 5.5m *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method

The "Phoenix Stage Construction Method" is a rapid construction method for temporary piers suitable for maintenance and repair work during dry periods. In spaces with a clearance of less than 6 meters, it reduces the number of welding points on support piles using a low-head telescopic crane and the newly developed Phoenix Hammer, enabling high-quality rapid construction. Together with the LIBRA method, it rapidly constructs a working stage for various repair and reinforcement works, as well as disaster recovery works, including low-head spaces within rivers, creating a comfortable construction period. 【Features】 - Rapid construction of piers in working spaces under 6 meters - Pre-construction of superstructures via stay cable equipment - Simultaneous parallel construction of ground assembly and pile driving - Use of steel pipes as support piles *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method

The "Screw Driver Method" can accommodate a wide range of drilling diameters from φ800 to 3200mm. While performing casing drilling with a fully rotating all-casing drilling machine known for its drilling capabilities, it utilizes a screw-type middle drilling device to intermittently discharge large volumes of soil in an earth drill manner, achieving simultaneous improvements in speed, quietness, and environmental performance. This is a new standard that consolidates the features of conventional methods. 【Features of the Screw Driver Method for Hard Ground】 ■ Screw type ■ The storage capacity of excavated soil is approximately 8 to 25 times that of a hammer grab, significantly reducing the number of discharges ■ The discharge efficiency improves compared to a hammer grab in proportion to depth ■ Reliable shear excavation is possible for general earth, consolidated clay layers, gravel layers, sand and gravel layers, soft rock layers, etc. ■ It can be used not only for casing rotary drilling methods but also as a middle drilling device for pipes such as steel pipes and steel sheet piles. *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method

The "Micro Joint Pile Method" is a rock embedding method using special short-length jointed steel pipe sheet piles that eliminates the need for pre-drilling at the joint sections. By utilizing special short-length joints (micro joints) to shorten the pitch, the labor of pre-drilling is eliminated. By installing micro joint-type steel pipe sheet piles specifically designed for this method at approximately one-fourth the conventional short pitch, pre-drilling at the joint sections becomes unnecessary, allowing for simultaneous rock excavation and installation of steel pipe sheet piles in one process. 【Features】 ■ Construction technology review certification obtained ■ Direct installation of steel pipe sheet piles into rock layers is possible ■ Rental options for steel pipe sheet piles are available ■ Elimination of pre-drilling labor through pitch shortening with special short-length joints *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method

The "Large Diameter Deep Depth Steel Pipe Installation Method (φ3200)" is a method for directly rotating and installing steel pipe piles equipped with a drilling bit at the tip. It utilizes a full-circle rotary drilling machine with one of the largest diameters in the country, φ3200mm, capable of handling various underground construction projects. If necessary, large-diameter steel pipes can be directly rotated and installed into bedrock layers. The new technology of casing inner drilling allows for low-noise and low-vibration construction driven by hydraulic power, making it suitable for nighttime work in urban areas. 【Features】 - A method for directly rotating and installing steel pipe piles equipped with a drilling bit at the tip. - Utilizes a full-circle rotary drilling machine with one of the largest diameters in the country, φ3200mm, capable of handling various underground construction projects. - Large-diameter steel pipes can be directly rotated and installed into bedrock layers if necessary. - Effective in construction projects that protect cities from flooding caused by sudden heavy rains. - Can also be used for the construction of launch and arrival shafts for various shield projects. *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method

We, Yokoyama Foundation Construction, are a specialized contractor for foundation work, ranging from heavy temporary works to foundation construction. Until now, we have collaborated with many clients on various projects, providing technical proposals for shortening construction periods, reducing noise and vibration, and overcoming numerous challenging construction tasks, successfully implementing these solutions. In this catalog, we introduce various NETIS registered methods. For more details, please download the catalog or contact us through our website.

• Foundation construction

The A-CR method is a new system for safely removing underground obstacles using heavy machinery with low noise, low vibration, and a low center of gravity. It addresses the challenges of traditional underground obstacle removal methods through a crane-suspended crusher that operates freely within the casing. *For case studies, please visit our website via the related link.

• Steel structure construction

Solving various challenges in maintenance, repair, seismic reinforcement, and renewal construction with the concept of "inner excavation with capsules." 【Features】 ■ Obtained construction technology examination certification ■ Capable of handling difficult construction conditions for well foundation work ■ Possible to perform large-diameter and deep insertion construction ■ Achieves low noise, low vibration, splash prevention, and no soil discharge. Construction considerate of the surrounding environment is possible ■ Shortens construction period by improving soil discharge efficiency *For construction examples, please visit our website via the related links.

• Other earthworks, foundation works, and exterior floors

The "LIBRA Method" makes it easy to secure the center of the piles by using upper steel panels as guides for pile driving, eliminating the need for scaffolding until the upper structure is erected, and significantly reducing the complexity of reinforcing bridge piers on sloped terrain. It is developed with the aim of improving the safety of temporary bridges and temporary piers while pursuing a reduction in construction time, and simultaneously minimizing the impact on the natural environment. Additionally, since the connection points of the new panels to the pile bridge piers serve as guides for steel pipe driving, it reduces the work for shaping the base surface and installing guides on sloped surfaces, thereby enhancing safety and minimizing the impact on the natural environment. 【Features】 ■ Shortened construction period ■ High safety ■ Improved workability ■ Consideration for the natural environment ■ Stable construction 【Method Specifications】 ■ Pile Diameter: Φ457.2, Φ508, Φ609.6, Φ800 (mm) ■ Span Length: 6, 8, 10, 12.5, 20 (m) ■ Load: Automobile, crawler crane (70-200t lifting) *For more details, please refer to the catalog or feel free to contact us.

• Other earthworks, foundation works, and exterior floors

The "Multipurpose SEP (Seito)" is a modular self-elevating platform that pursues mobility and deployment scale. Along with advanced foundation construction techniques from Yokoyama, such as the PRD-ROSE method and the Capsule Hoh-Pyra method, it can meet various needs in inland and offshore construction, including large-diameter deep excavation, steel pipe sheet piling, steel pipe pile driving, cast-in-place pile construction, replacement excavation, and ground improvement. It can be applied to existing pile work, temporary closure work, steel pipe sheet piling, and obstacle removal in river, dam lake, pond, and port construction. 【Features】 ■ It can be transported by sea with cranes and equipment onboard, allowing for quick securing of heavy machinery work platforms in ports and rivers. ■ It supports vertical loads with four legs and can elevate the platform, reducing the impact of waves in ports and swift currents in rivers, enabling stable construction. *For more details, please refer to the PDF document or feel free to contact us.

• Foundation construction

The "PRD-ROSE Method" is a group of open-end down-the-hole hammer drilling technologies that allows for the selection of methods tailored to various construction conditions such as diverse terrain, soil types, and excavation diameters. With a crane-suspended construction style, it can flexibly accommodate the distance and elevation differences between heavy machinery scaffolding and the center of the pile, while also minimizing the installation area of the heavy machinery scaffolding. Thanks to a variety of drilling techniques, including large-diameter low-vibration and low-noise drilling with CD (Cluster Drill) type hammers for hard rock formations, rapid construction is achieved under diverse site conditions. 【SINGLE TYPE Features】 ■ Standard type for open excavation ■ Suitable for stable ground with stable borehole walls ■ Capable of large-diameter drilling up to 1,830mm *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method