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.

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.

The "Hybrid Joint TCF Type" is an expansion device for bridges designed for the Tohoku region, capable of withstanding "snow load." It meets the 10kN snow load requirement set by the Tohoku Regional Development Bureau. Additionally, it adopts a structure known as the "face plate type," which prevents the water-stopping material from being exposed on the surface, and comes standard with "secondary water-stopping material." By utilizing a double structure, it reduces the risk of leakage and achieves higher water-stopping performance. Furthermore, to prevent snowplow blades from getting caught in the expansion device, it is also equipped with a "snow removal guide plate" as standard. This not only protects the product itself but also considers safety during snow removal operations. 【Features】 ■ An expansion device for bridges that is compatible with "snow load" and has excellent water-stopping performance. ■ A durability of 50 years, reducing life cycle costs. ■ Contributing to social infrastructure with a comprehensive product lineup. *For more details, please refer to the related links 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.

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 create expansion gaps to prevent the bridge girders from colliding with the bridge abutments or with each other due to thermal expansion and contraction. 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 for it to only fulfill that function. Consideration must be given to the safe passage of vehicles and economic aspects, and specifically, the following functions are highlighted: [Functions Generally Required of Expansion Devices] - No noise during travel - No impact during travel - Long-term usability - No leakage under the girder - Easy installation - Simple and cost-effective 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 installation - Replaceable - Economical

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.

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 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.

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.

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.