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A bridge expansion device is something that is installed in the gaps (expansion gaps) between the bridge abutment and the bridge girder, or between bridge girders. When designing a bridge, it is necessary to provide expansion gaps to prevent the bridge girders from colliding with the bridge abutments or with each other due to thermal expansion and contraction caused by temperature changes. To cover these gaps and ensure safe passage for vehicles and pedestrians, a bridge expansion device is required. The role of the expansion device is to fill the gaps, but it is not sufficient to only fulfill that requirement. Consideration must also be given to the safe passage of vehicles and economic aspects, with specific functions including the following: 【Functions Generally Required of Expansion Devices】 - No noise during travel - No impact during travel - Long-term usability - No leakage under the girder - Simple construction - Easy and low-cost maintenance - Low cost of the device itself Our hybrid joint has eight major features that meet the required functions: - Compatible with small bridges to long-span bridges - Usable for all types of bridges - Ultra-low noise and comfortable travel - Long-term durability and maintenance-free - High water-tightness - Safe and easy construction - Replaceable - Economical

We are currently offering technical materials from Crittec Industries Co., Ltd. titled "Expansion Device Explanation Series - Structure of Expansion Devices." This includes an introduction to the classification of structures, their respective features, and the locations where they are used, along with illustrations. [Contents] ■ Classification of Structures ■ Features of Butt Joint Type ■ Features of Load Support Type *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

The "NCS-40" is a bridge expansion device that is bonded using press vulcanization of rubber and steel plates. Its uneven shape in the gap area enhances durability and achieves ultra-low noise, making it suitable for wide slab gaps. The standard length is 1.8m, and it can be adjusted on-site to accommodate the standard length and ends according to the width. 【Features】 ■ Press vulcanization bonding of rubber and steel plates ■ Excellent water resistance ■ Improved durability ■ Ultra-low noise *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

The "CS-50" is a bridge expansion device that bonds rubber and steel plates through press vulcanization. It exhibits excellent water-stopping performance. The steel vertical uneven shape enhances durability and achieves ultra-low noise, making it suitable for wide-span floor slabs. 【Features】 ■ Press vulcanization bonding of rubber and steel plates ■ Excellent water-stopping performance ■ Improved durability ■ Ultra-low noise ■ Compatible with steel floor slabs *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

We are currently offering a comprehensive catalog (excerpt version) that clearly introduces the bridge expansion device "Hybrid Joint," which accommodates various types of bridges, for free. It is compatible with various bridge types, including steel bridges, PC bridges, RC bridges, as well as cable-stayed and curved bridges, featuring a high-performance waterproof structure that combines rubber and steel through press vulcanization bonding. Due to its small surface exposure, it generates less impact during vehicle passage, resulting in reduced noise and vibration. Its compact size allows for installation using a 4-ton unic crane, enabling safe, easy, and quick construction. 【Features】 ■ Compatible with various bridge types such as steel bridges, PC bridges, RC bridges, cable-stayed bridges, and curved bridges ■ Ultra-low noise and vibration-free ■ High waterproof performance ■ Long-term durability of 50 years ■ Ease of installation *For more details, please refer to the PDF document or feel free to contact us. *The PDF document is a digest version. If you would like the complete catalog, please contact us.

The "PS type" is a checker plate with a non-slip surface treatment. To ensure safety for pedestrians, a sliding mechanism is incorporated in the expansion joints. It employs press vulcanization adhesion, which excels in water resistance and durability. We offer a wide range of products including "PS-20," "PS-30," "PS-100," and "PS-250." 【Features】 ■ Non-slip prevention using checker plate ■ Sliding mechanism in expansion joints for pedestrian safety ■ Press vulcanization adhesion used for steel plates and water seal rubber ■ Improved durability of the adhesive surface at the water stop section *For more details, please refer to the PDF document or feel free to contact us.

Before installing the expansion joint, in many cases, the manufacturer calculates and sets the width for installation. Depending on the manufacturer, this may be referred to as "pre-compression" or "installation adjustment." What is the purpose of this? Expansion Joint Navi explains the purpose and calculation details. For more information, please refer to the related link. 【Contents】 ■ Purpose of pre-compression ■ Calculation method for pre-compression ■ Cases where pre-compression is unnecessary ■ Summary * For more details, please check the related link page or feel free to contact us.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

"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.

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.