クリテック工業 List of Products and Services

【Feature 1】Low Product Height In recent years, in response to the increasing demand for low-height expansion devices, we have developed a unique product. This product, with a height of 75mm, fits within the typical pavement thickness and is particularly suitable for older bridges where there are restrictions on the thickness of the deck. Additionally, in snowy regions, products that can handle snow compaction have also been developed. Please feel free to reach out if you have any concerns. 【Feature 2】High Water Resistance The connection points between joints and the rubber and steel plate sections are bonded through press vulcanization, preventing delamination and providing excellent water resistance. 【Feature 3】Short Construction Time Due to the shallow notch depth, construction can be completed in a shorter time compared to conventional products. 【Feature 4】Design Tailored to Expansion Amount and Shape Designed and manufactured according to the expansion amount and shape for each location. It can be used in various situations, including connection points, ultra-small bridges, and pedestrian areas.

• Bridge Materials

Buried expansion devices, unlike other joints, are not visible from the road. Since they are embedded in the pavement, they are integrated with the road, resulting in minimal noise and vibration. Additionally, maintenance is relatively easy, and over the long term, costs can be significantly reduced. As a result, they are increasingly being installed in small to medium-sized bridges. This article explains the features and benefits of buried expansion devices. We will also introduce the manufacturers producing them, so you can grasp all the details. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Bridge Materials
• Bridge Construction

The expansion and contraction devices can be broadly divided into drainage type and non-drainage type. When these devices first started being installed, the drainage type was used, but over time, the non-drainage type has become the mainstream. The difference between the two lies in whether or not water leakage measures are implemented. However, due to the infrastructure development policies set by the government, most manufacturers have started producing non-drainage types. This article introduces the differences between drainage and non-drainage types as well as their usage ratios. Additionally, we have summarized the mechanisms that enhance the functions of the devices, so please refer to that as well. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

• Bridge Materials
• Bridge Construction

The expansion and contraction of a bridge is very important information when selecting expansion devices. Bridge girders expand and contract regularly due to changes in temperature. To accommodate this, expansion devices are installed, making the calculation of expansion and contraction very important. However, the amount of expansion and contraction is not determined solely by temperature changes. It is complex because various conditions, such as drying and deformation due to loads, must be taken into account. In this article, we will clearly explain how to determine the expansion and contraction of bridge girders. We have summarized the key points and main ideas, so you can grasp the overall concept. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

• Bridge Materials
• Bridge Construction

The replacement of expansion joints requires thorough on-site investigation and construction tailored to the situation. Since the construction time is limited to one day, schedule management is also very important. Additionally, there are many points to consider that differ from new installations, such as the height of the installation and the area of concrete removal. This article summarizes the flow and key points related to the replacement of expansion joints. Please refer to it as preliminary knowledge before the construction. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Bridge Materials
• Bridge Construction

One of the functions required of expansion joints is water-tightness. High water-tightness not only extends the lifespan of bridges but also reduces lifecycle costs, providing many benefits. However, the water-stopping materials that fulfill this role are very susceptible to damage and are a major cause of leaks. Therefore, various measures are being implemented by manufacturers to maintain the water-stopping materials for as long as possible. This article explains the role of water-stopping materials in expansion joints and the types of water-stopping materials. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

• Bridge Materials
• Bridge Construction

The installation of expansion joints differs depending on whether they are newly installed or replacing existing ones. Additionally, whether the device is set up first or later, as well as the type of device being installed, also affects the process, making the steps surprisingly complex. In this article, I have summarized the basic methods of installation based on the new installation of expansion joints. I have also explained the key points and precautions for each installation, so you will have a solid understanding of the overview after reading it. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

• Bridge Materials
• Bridge Construction

When an expansion joint is installed, gaps are created around it. The material used to fill those gaps is called joint material (elastic sealant). Joint material is used to prevent water leakage, but on its own, it does not have very high durability. Therefore, depending on the requirements for the bridge, other methods may be used in combination with joint material. This article explains the role and characteristics of joint material for expansion joints, and also summarizes methods to supplement sealants. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Bridge Materials
• Bridge Construction

Steel deck plates have the advantage of being able to lighten the bridge girders themselves. Additionally, they are valued for their ability to significantly shorten construction periods, but care must be taken when installing expansion devices. This article explains the characteristics of steel deck plates and the key points for installing expansion devices. We also introduce expansion devices that can be used with steel deck plates, so please refer to this as a guide for selecting devices. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

• Bridge Materials
• Bridge Construction

At the base of the abutments and piers, foundations are established to transfer the load of the bridge to the ground. The foundations are classified into three types based on their construction, each with distinct characteristics. This article explains the types and features of bridge foundations. Additionally, we have summarized the usage ratios of each foundation and their trends, so please use this information as knowledge about bridges. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Bridge Materials
• Manufacturing Equipment

The abutments and piers are the substructures that support the superstructure of a bridge. The abutments are also referred to as abutments, and the piers are called piers. Expansion devices are installed between the ends of the girders and the parapets on the abutments. When the ends of the girders are on the piers, expansion devices are installed, but these expansion devices are only placed between the girders and do not affect the piers. *For detailed information on the columns, please refer to the related links. For more information, feel free to contact us.*

• Bridge Materials
• Manufacturing Equipment

A bridge girder refers to the part where people and vehicles pass. It is a major component of the bridge and is constructed using materials such as concrete and steel. Additionally, the impact on the bridge girder varies significantly depending on the scale of the bridge and the environment in which it is installed. Therefore, there are various types of bridge girders designed to accommodate these factors, each with its own characteristics. This article introduces what a bridge girder refers to, accompanied by illustrations. It also summarizes the types and structures of bridge girders, so please use it as foundational knowledge about bridges. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Manufacturing Equipment

A bridge is a structure built over rivers, valleys, seas, and roads, designed to provide a transportation route across to the opposite bank. Bridges have a long history of development alongside humanity, and today there are various types. Additionally, the characteristics of these bridges differ based on their structures, so construction must be tailored to the environment in which the bridge is installed. This article explains the structures and types of bridges. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Manufacturing Equipment

A finger joint is one type of expansion device installed at the joints of bridges and highways. It is made of steel and is characterized by its comb-like appearance, and it is a device that has been used for a long time. In this article, we will explain the features of finger joints based on three key points. It summarizes basic knowledge such as appearance and structure, so by reading it, you will grasp the overall outline. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Manufacturing Equipment

Rubber joints are one type of expansion device, primarily made from rubber and sealing materials. Basically, the device itself cannot support the weight of a vehicle, so it is often installed in places like sidewalks or areas with low traffic. However, rubber materials are easy to maintain after installation and have the characteristic of reducing the impact on vehicles passing over them. Therefore, it is common for expansion devices to be made not just from rubber alone, but in combination with steel materials. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.

• Manufacturing Equipment

The hybrid joint is an expansion device manufactured by our company. Expansion devices vary in performance and elasticity depending on their type, so it is necessary to choose one based on the bridge or road where it will be installed. However, the hybrid joint can be used in any location and has high durability, allowing for long-term use. In this article, we will introduce the features of the hybrid joint along with product examples and photos. Please use this as a reference when selecting an expansion device. *For detailed information in the column, please refer to the related links. For more information, feel free to contact us.

• Manufacturing Equipment

A PC bridge refers to a bridge constructed using prestressed concrete. It has a higher strength compared to reinforced concrete bridges, making it suitable for longer spans. Additionally, PC bridges are categorized into different types based on their structure, each with its own characteristics. Therefore, it is necessary to install them according to the usage environment, which requires an understanding of each characteristic. This article summarizes what a PC bridge is, including its advantages. It also introduces the differences between PC bridges and steel bridges, so please refer to it as foundational knowledge about PC bridges. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Manufacturing Equipment

The ground cover refers to the foundation of the bridge's railing and the horizontal material that is installed adjacent to the road. In typical roads, gutters are installed to drain rainwater, preventing overflow onto the road surface. This road gutter is similarly installed on bridges, designed to ensure smooth drainage even on elevated roads, with the ground cover fulfilling that function. *For more details, you can view the related links. If you have any questions, please feel free to contact us.*

• Manufacturing Equipment

It refers to the components installed between the upper structure of the bridge (main girder/main frame) and the lower structure (abutments and piers). Also known as "kutsu," it is called "bridge bearing" in English. These components accommodate the expansion and contraction of the girder due to temperature changes and the deflection caused by live loads, and since they constantly support the bridge girder, they are a very important part. A bridge that connects the upper structure directly to the lower structure without installing bearings is called a rigid-frame bridge. *For detailed information about the columns, please refer to the related links. For more information, feel free to contact us.

• Manufacturing Equipment

An expansion joint is a device used to fill the gaps found in bridges and highways. If there are gaps in a bridge, it can cause issues when vehicles pass over it, so these joints are installed to cover the gaps and allow for a comfortable passage. However, although they are referred to as coverings, they are not simply metal plates that cover the gaps. There are other roles that an expansion joint is required to fulfill, and manufacturers produce and handle products that meet the necessary quality and functionality. This article explains the roles that expansion joints play. It also summarizes the types of expansion joints and manufacturers, so by reading it, you should gain a general understanding of the topic. *For detailed information, please refer to the related links. Feel free to contact us for more information.*

• Manufacturing Equipment

The lifespan of a bridge is greatly affected by the water-stopping performance of the expansion device. While it is natural to require the water-stopping performance of the main product (primary water stop), recently there have been increasing cases where the installation of "secondary water-stopping materials" is requested in case the primary water-stopping performance of the main body deteriorates. Therefore, I would like to explain the "purpose" of the secondary water-stopping materials related to the water-stopping performance of the expansion device and provide "introductions to products from various manufacturers." *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

• Manufacturing Equipment

Expansion devices can be broadly divided into three types: by structure, by material, and by function. Each device has different characteristics, such as high shock absorption and ease of maintenance. Therefore, it is very important to understand the merits of each device in order to choose one that fits the environment of the bridge or road where it will be installed. This article introduces the types of expansion devices and explains their characteristics and advantages. By reading the article, you can get a general idea of what types of devices are available. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

• Manufacturing Equipment

To adopt our products on the expressway (NEXCO), it is necessary to obtain certification in accordance with NEXCO's guidelines. Our lineup for NEXCO has traditionally included the CF type (expansion amounts of 30, 50, and 80mm) and the 3LII type (expansion amounts of 200, 250, 300, and 350mm). However, there was a gap between 80mm and 200mm, making it difficult to provide good proposals for projects requiring an expansion amount of 100mm. To address this demand, we developed the NCF-100 with an expansion amount of 100mm, and the 3LII-150 and 3LII-160 with expansion amounts of 150mm and 160mm, respectively. Additionally, we developed the CF-20 with a compact design and an expansion amount of 20mm, as well as the NCF type that can handle snow compaction. We are pleased to announce that these new products have received new certification from NEXCO. It is worth noting that the expansion amounts of 150mm and 160mm are close because the order documents may specify those exact expansion amounts. Please feel free to request materials or contact us at the timing of your product consideration before bidding or after winning the bid.

• Bridge Materials

The Hybrid Joint NS-LL type and 3LIIA type have been confirmed to have a durability of 50 years after undergoing a loading test of 6 million cycles as specified by NEXCO's fatigue durability test. Traditionally, expansion devices are often required to have a durability of about 30 years, but since bridges are expected to last 100 years, it is undeniable that expansion devices can shorten the lifespan of bridges. Our product, the Hybrid Joint, contributes to extending the lifespan of the expansion device itself, thereby reducing lifecycle costs and promoting the longevity of bridges. We offer a wide range of products from small to large, accommodating expansion amounts from 20mm to 600mm. 【Features】 ○ 50 years of durability ○ High water-tightness ○ Steel vertical shape ~~ We are currently seeking agents! Agents from the Tohoku and Hokuriku regions are very welcome! Of course, we can also accommodate companies from other regions! ~~ For more details, please contact us or request a catalog.

• Foundation construction

The bridge expansion device "Hybrid Joint CS Type" has passed water-tightness and durability tests according to the specifications of the Metropolitan Expressway. It has been decided to be newly adopted by the Metropolitan Expressway Company. As a result, the CS Type has become a pioneering approved product for the steel deck slabs of the Metropolitan Expressway. 【Features】 ■ Dedicated for steel deck slab installation ■ Compatible with single-sided and double-sided steel deck slabs ■ Excellent water-tightness ■ Improved durability ■ Ultra-low noise *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

• Bridge Materials

The Hybrid Joint NS-LL type is manufactured using the press vulcanization bonding technology, which is also used in the production of bearings. Regarding the bonding part, it has been confirmed through a tensile test by the Chemical Substance Evaluation Research Organization that the failure mode was material failure rather than cohesive failure, meaning there was no delamination. This indicates that the steel plate and rubber are bonded very strongly, making it a product with excellent water-tightness. In addition to the strong adhesive force between the rubber and the steel plate, the structure is designed so that the water-stopping rubber does not come into direct contact with the tires of passing vehicles, making it less prone to wear. The range of products available includes both small and large items, accommodating expansion amounts from 20mm to 175mm and a maximum applicable slab gap of 395mm. **Features** - High water-tightness - Steel vertical tooth shape - One-lane assembly product ~~ We are currently seeking agents! Agents from the Tohoku and Hokuriku regions are very welcome! Of course, we also accommodate companies from other regions! ~~ For more details, please contact us or request a catalog.

• Foundation construction
• Dam construction

"Expansion Device Navi" is a comprehensive guide for those troubled by bridge expansion devices. It is useful for both newcomers who are unsure about the types of expansion devices available and veterans seeking specialized knowledge, such as wanting to know repair procedures or comparing multiple manufacturers. This document, "Quick Reference Table of Expansion Device Lineup," introduces the allowable expansion ranges of major products from various manufacturers. It includes a "Comparison Table of Expansion Device Manufacturers" and "Overview of Each Manufacturer." It is recommended for those considering expansion devices for the first time, those wanting to compare multiple products, and those interested in knowing the range of products offered by each manufacturer. Please take a look. [Contents (Excerpt)] ■ Comparison Table of Expansion Device Manufacturers - Comparison Table of Expansion Device Manufacturers 1 - Comparison Table of Expansion Device Manufacturers 2 - Matrix Table of Expansion Device Manufacturers *For more details, please refer to the PDF document or feel free to contact us. "Expansion Device Navi" is operated by Crittec Industrial Co., Ltd.

• Joints between components

This document introduces the "Automatic Selection Tool for Expansion and Contraction Devices." By entering the "expansion amount" and "gap" for the location where you want to install the expansion and contraction device, you can easily select the appropriate product. If you are struggling with thoughts like, "I think there might be a more suitable product, but I don't have time to research..." please feel free to use this tool. 【Contents】 ■ What is the Automatic Selection Tool ■ How to Use the Automatic Selection Tool *For more details, please refer to the PDF document or feel free to contact us.

• Other Software

The expansion and contraction device can be selected based on "expansion and contraction amount" and "play," but it is difficult to search for each one in the catalog. Therefore, we have created a tool that allows you to easily select products by inputting the "expansion and contraction amount" and "play" for the location where you want to install the expansion and contraction device. This document introduces how to use the 'Hybrid Joint Automatic Selection Tool.' Please make use of it. [Contents] ■ What is the automatic selection tool? ■ How to use the automatic selection tool *For more details, please refer to the PDF document or feel free to contact us.

• Other Software

Have you ever heard a "thud" sound coming from above when passing under a bridge? It might be the sound of a vehicle passing over an expansion joint. When the sound is small, people tend not to pay much attention to it, but when it becomes loud, it can be a significant source of stress for those living nearby. At Expansion Joint Navi, we provide information on "causes of noise generation," "noise countermeasures," and "inspection methods," among other topics. For more details, please visit the related link page. 【Contents】 ■ Damage caused by noise ■ Causes of noise generation ■ About noise countermeasures ■ About inspection methods ■ Summary *For more details, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment
• others

In the construction work for the ground cover section that needs to be done at both ends of the expansion joint, aesthetics tend to be emphasized, but the treatment of the ground cover section of the expansion joint is also a part that prevents the deterioration and leakage of the bridge. Since it doesn't appear much in cost estimation, many people may not have been very aware of it until now. At Expansion Joint Navi, we will explain about expansion joints and ground cover treatment. For more details, please refer to the related links. [Contents] ■ Ground cover treatment from the perspective of water stopping ■ Cover plates and their performance ■ Shapes and types of ground cover ■ Summary *For more details, please check the related link page or feel free to contact us.

• Manufacturing Equipment
• others

When constructing product joints, post-cast concrete is structurally essential. What are the performance requirements for post-cast concrete in terms of construction and planning? In Expansion Joint Navi, we present three key performance points required for post-cast concrete to ensure the longevity of expansion joints. For more details, please refer to the related link page. [Contents] ■ What are the performance requirements for post-cast concrete? ■ What specific actions should be taken? ■ Summary *For more details, please check the related link page or feel free to contact us.

• Manufacturing Equipment
• others

Even though they are called expansion devices for bridges, their shapes, materials, and functions are highly diverse. They may all look the same, but it is essential to choose an expansion device that suits the bridge in terms of maintenance and functionality. In Expansion Device Navi, we introduce "The Perfect Method! A Simple 3-Step Guide to Selecting Expansion Devices." For more details, please refer to the related link page. [Contents] ■ Preparations before calculations ■ Let's try calculating! ■ Summary *For more information, please check the related link page or feel free to contact us.

• Manufacturing Equipment

There are various types of "expansion joints for bridges." Even when looking at the design drawings, some might say, "I don't really understand" or "Aren't they all the same?" At Expansion Joint Navi, we explain the features and differences of each type of bridge expansion joint and provide an introduction. For more details, please visit the related link page. [Contents] ■ Expansion joints viewed by component ■ Explanation of the three classifications of expansion joints ■ Explanation of rubber joints (simple steel joints) ■ Summary *For more details, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment

There are various types and shapes of expansion devices, but many people may think, "I don't know which product to choose based on the design conditions" or "They all seem similar." At Expansion Device Navi, we introduce 13 manufacturers of expansion devices, allowing you to select the most suitable one based on your design conditions. For more details, please visit the related link page. [Contents] ■ Features of each manufacturer *For more information, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment

Many people might think, "I rarely deal with niche construction types like expansion joints, and I don't understand the construction process!" At Expansion Joint Navi, we provide ten key points necessary for managing the installation of expansion joints, aimed at those struggling with construction management. We also touch on cost and scheduling aspects that are useful for estimation, so we encourage design and estimation personnel to check out the related link page. [Contents] - List of Key Points - Individual Explanations *For more details, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment

So far, we have mainly introduced the types and selection methods of expansion joints. The construction procedure for expansion joints (repair work) generally follows this flow: pre-construction → cutter work → removal of existing expansion joints → installation of the product → fixing (welding, etc.) → pouring of backfill concrete → completion. At Expansion Joint Navi, we introduce the equipment necessary for the installation of expansion joints in accordance with the construction flow. For more details, please refer to the related links. [Contents] ■1. Cutter Work ■2. Removal of Existing Expansion Joints ■3. Product Installation ■4. Fixing (Welding, etc.) ■5. Concrete Pouring ■Summary *For more details, please refer to the related links page or feel free to contact us.

• Manufacturing Equipment
• others

In November 2017, the Road Bridge Design Guidelines were revised. In particular, significant changes were made to fundamental aspects such as the verification methods and live load stresses, which are essential for design and estimation. Additionally, there have been additions and modifications to the formulas related to expansion devices. The Expansion Device Navi mainly introduces the changes in the selection calculation methods as outlined in the Road Bridge Design Guidelines. For more details, please refer to the related links. [Contents] ■ Changes ■ Summary * For more information, please check the related links page or feel free to contact us.

• Manufacturing Equipment

Did you know that there are actually various materials used for the installation of expansion devices? This time, I will introduce the accessory "rebar" for expansion devices, which is not often discussed. For more details, please refer to the related link page. [Contents] ■ How is the expansion device fixed? *For more details, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment
• others

The water-stopping performance of expansion joints significantly affects the lifespan of bridges. While it is natural to require the primary water-stopping performance of the product itself, there has been an increasing demand recently for the installation of "secondary water-stopping materials" that can provide additional water-stopping in case the primary performance deteriorates. At Expansion Joint Navi, we provide explanations of the "purpose" of secondary water-stopping materials related to the water-stopping performance of expansion joints, as well as introductions to products from various manufacturers. For more details, please refer to the related links page. [Contents] ■ Purpose of secondary water-stopping materials ■ Secondary water-stopping materials from various manufacturers ■ Summary *For more information, please check the related links page or feel free to contact us.

• Manufacturing Equipment
• others

In many cases, the required quality control items for contractors are mainly "installation height," "surface irregularities," and "finish height." In the Expansion Device Navi, we explain each of the quality control items related to expansion devices. For more details, please refer to the related link page. [Contents] ■ Installation Height ■ Surface Irregularities ■ Finish Height *For more details, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment
• others

When installing expansion joints, there are times when "under-beam protection" is required. However, there is often a lack of information on how to do this, which can be quite troublesome. At Expansion Joint Navi, we explain under-beam protection based on different site conditions. For more details, please check the related link. 【Contents】 ■ Why is under-beam protection necessary? ■ A comprehensive introduction to methods of under-beam protection! ■ Summary *For more details, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment
• others

Have you ever had the experience of thinking about replacing an expansion device only to find that the bridge type was a steel deck? Steel decks have the advantages of being lighter in weight, having a lower structural height, and significantly shortening on-site construction time. However, there are points to be cautious about when replacing expansion devices. Expansion Device Navi provides detailed check points for installing expansion devices on steel decks. For more details, please refer to the related link page. [Contents] ■ Differences between steel decks and other types of decks ■ Expansion devices installed on steel decks ■ Methods for securing expansion devices to steel decks ■ Typical expansion devices ■ Summary *For more information, please refer to the related link page or feel free to contact us.

• Manufacturing Equipment
• others

When there is a replacement work for the expansion joint device, what is often done with a high probability is "leveling work." In Expansion Joint Navi, we introduce the purpose and required performance of the leveling materials used there, as well as representative product names. For more details, please refer to the related link page. [Contents] ■ Why leveling work is necessary ■ Required performance of leveling materials ■ Leveling materials from various manufacturers *For more details, please check the related link page or feel free to contact us.

• Manufacturing Equipment
• others

Remove the expansion joints, install new expansion joints, pour concrete, and wait for it to cure... When you think about it, an 8-hour traffic restriction seems hardly sufficient. That's where "ultra-rapid hardening concrete" becomes essential. On the Expansion Joint Navi, we provide information on the pouring methods for "ultra-rapid hardening concrete" and representative products from various manufacturers. For more details, please visit the related links page. [Contents] ■ What is ultra-rapid hardening concrete? ■ Pouring methods for ultra-rapid hardening concrete ■ Ultra-rapid hardening concrete from various manufacturers *For more details, please check the related links page or feel free to contact us.

• Manufacturing Equipment
• others