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High durability and simple embedded joints Innovative bridge expansion device
The MM-JOINT DS type is a simple and highly durable bridge expansion device composed of a special binder, DS aggregate as the main material, along with a primer, back rod, and gap plate. In January 2026, it obtained the "VE" evaluation from NETIS.
No secondary water stop needed - seismic performance achieved! Buried expansion device boasting high durability.
The "PA Joint" is a buried expansion device that does not require secondary water stopping, featuring seismic resistance due to its ability to expand and contract in all directions by 360 degrees. It does not experience the fluidity and cracking typical of buried joints, and it is robust with high durability (over 15 years). It performs better against temperature fluctuations and can accommodate a maximum expansion of up to 100mm. This significantly improves the durability issues associated with conventional buried joints, suppresses the occurrence of subsidence and cracking due to fluidity, and ensures the safety of passing vehicles. 【Features】 ■ High durability ■ Zero displacement after over 63,000 rotations in wheel tracking tests ■ Average wear of 0.05mm in labeling test results (Japan Road Construction Association) ■ Can be constructed with the same material for the ground cover, allowing for seamless water stopping ■ Exhibits the same expansion and contraction performance in all 360 degrees *For more details, please refer to the PDF materials or feel free to contact us.
High water resistance at the connection surface! Reduced life cycle costs through partial replacement with a bolt fastening structure.
The "Hinodakutairu Joint α CV Type" is a cast iron expansion device that achieves a durability equivalent to 30 years through its unique cast iron technology. The bolt fastening structure allows for partial replacement, reducing lifecycle costs. It is possible to protect the water-stopping material with a load-supporting plate and dustproof material. The water-stopping structure at the connection surface is designed to minimize gaps by compressing the protruding water-stopping material, effectively preventing leakage from the connection surface. 【Features】 ■ Maintainability: Reduced lifecycle costs through partial replacement with a bolt fastening structure ■ Durability: Achieves a durability equivalent to 30 years through unique cast iron technology ■ Water-stopping capability: Protection of water-stopping material with a load-supporting plate and dustproof material ■ High water-stopping capability at the connection surface ■ Safety during passage: The semi-circular shape mitigates impact during vehicle passage *For more details, please refer to the PDF document or feel free to contact us.
Leave the stretchable devices to us!
We offer finger joints and mauler joints, providing expansion devices that match each bridge. We handle expansion devices that accommodate temperature changes in bridges and expansion due to earthquakes, while ensuring durability and good drivability. Please feel free to contact us if you have any requests. 【Lineup】 ■ Mauler-type expansion devices ■ Finger-type expansion devices *For more details, please download the PDF or feel free to contact us.
[NETIS Registration] Solving expansion device issues with elastic joint materials and protective devices.
Our company offers the small-scale bridge expansion device "Double Defense Joint," which ensures that the protective device does not touch the waterproof section and achieves a longer lifespan than conventional methods. The Double Defense Joint, with its extremely high durability of waterproof functionality, features a structure that creates a space between the elastic joint material in the gap and the protective device, ensuring that no wheel load is applied to the waterproof section. Additionally, the structure is simple, allowing for quick installation, which reduces the time for traffic restrictions such as lane regulations and traffic openings. 【Features of the Double Defense Joint】 ■ High water tightness ■ Long lifespan ■ Short installation time ■ Smooth passage possible ■ Quiet operation ■ Joint protection type ■ NETIS registration number: KK-220006-A ■ Patent obtained *For more details, please download the PDF or feel free to contact us.
Protective devices, waterproof sheets, and elastic joint materials—these three elements solve the problems of expansion and contraction devices!
The "Triple Defense Joint" is a small-scale bridge expansion device that allows for quick installation, reducing the time required for lane restrictions and traffic openings. It features a double waterproof structure with elastic joint material in the gap section and a rubber waterproof sheet, completely shutting out water and preventing leaks that can cause damage to the bridge. Additionally, the structure includes a space between the rubber waterproof sheet and the protective device, ensuring that no wheel loads are applied to the waterproof section, significantly enhancing the durability of the waterproof function. 【Features】 ■ High water tightness with double waterproof structure ■ Long lifespan ■ Short installation time ■ Smooth passage due to a flat finish ■ Quiet operation ■ Patent obtained *For more details, please refer to the PDF document or feel free to contact us.
Many advantages with a 65mm high joint! Steel joint for load support within pavement thickness.
The "AI Joint" is a load-supporting steel expansion device that can be installed within the pavement without the need to remove the existing slab. With a joint height of 65mm, it reduces industrial waste generated from chipping work and shortens the time required for chipping and traffic restrictions. Additionally, we offer a type compatible with snow plow guidance plates for cold regions. 【Features】 ■ Reduced risk of damage ■ Noise reduction ■ Environmental measures ■ Snow removal measures *For more details, please refer to the PDF document or feel free to contact us.
What is an expansion device? The roles and required functions in bridges and highways - 8 major features that hybrid joints fulfill.
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
Large expansion range (200–600mm) and wide play space (up to 1230mm) compatible. Bridge expansion device that is environmentally friendly for bridge surroundings [NETIS registered product].
The Hybrid Joint 3LIIA type has a vertical integrated structure for the load support section and the anchor plate section, making it highly durable, with almost no damage from metal fatigue. By using steel plates vertically, the exposed parts are minimized, resulting in very low impact during operation, and the product is less likely to generate noise and vibration. It is capable of accommodating large expansion and contraction (200–600mm) and wide spacing (up to 1230mm). 【Features】 ○ Supports large expansion and contraction and wide spacing ○ High watertightness due to double waterproof structure ○ Long-term durability and maintenance-free For more details, please contact us or request a catalog.
[NETIS Registered Product] A bridge expansion device with high water stop performance, comfortable driving, and ultra-low noise.
This is a bridge expansion device adopted nationwide, primarily by the Ministry of Land, Infrastructure, Transport and Tourism, NEXCO, urban expressways, local governments, and other public organizations. 【Features (excerpt)】 ◆ Compatible with small to large bridges Handles expansion amounts from 20mm to 600mm, with a maximum gap of 1230mm. Other specifications can be designed separately. ◆ Usable for all types of bridges Can be used for all types of bridges, including steel bridges, PC bridges, RC bridges, as well as arch bridges and curved bridges. ◆ High water-tightness "NS-LL type": The steel plate and sealing rubber are bonded using a mold (press vulcanization bonding), preventing separation between the steel plate and rubber. ◆ Safe and easy installation Can be installed using a 4-ton unic crane without the need for large machinery like medium to large rough terrain cranes, allowing for safe and easy (speed-up) construction. Here’s a brief introduction to some installation examples! ~~ At the Tochigi Prefecture Nikko Civil Engineering Office (Maruyama Bridge), a "Hybrid Joint" was used for renovation work. * NS-LL type repair ~~ At the Kinki Regional Development Bureau Kinokawa River National Road Office (Takasegawa Bridge), it was used for a newly constructed bridge. * 3L type For more details, please contact us or download the catalog.
By installing the guide board, it prevents damage to the main body by the grader in snowy areas.
The hybrid joint is a non-drainage expansion device developed using a composite technology of rubber and steel materials, achieving very high water-tightness by press vulcanizing and bonding steel plates and rubber. Furthermore, by adopting a steel vertical shape for the load-bearing structure, the surface exposure area has been minimized, improving sound insulation and durability. 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 ~~ 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.
By shaping the steel plate into a guide plate type, it prevents damage to the main body of the grader due to expansion and contraction in snowy areas.
The Hybrid Joint 3LIIA type has a vertical integrated structure for the load support and anchor plate sections, making it highly durable with almost no damage from metal fatigue. By using steel plates vertically, the exposed areas are minimized, resulting in very low impact during operation and making the product less prone to noise and vibration. It is capable of accommodating large expansion and contraction (200–600mm) and wide gaps (up to 1230mm). 【Features】 ○ Supports large expansion and contraction and wide gaps ○ High watertightness due to double sealing structure ○ Long-term durability and maintenance-free For more details, please contact us or request a catalog.
By installing the guide board, it prevents damage to the main body by the grader in snowy areas.
The Hybrid Joint CF type features a tooth-shaped design that smoothly transmits the movement of wheel loads on its surface, and its structure is designed to minimize noise and vibration by absorbing shocks from unevenness. The water-stopping structure, made of elastic sealing material and rubber, offers high water resistance, and since standard products are assembled and delivered at the factory for installation, the likelihood of water leakage from connection points is low. 【Features】 ○ High water resistance ○ Low noise for comfortable driving ○ Complies with NEXCO standards For more details, please contact us or request a catalog.
A bridge joint with minimal shock during operation and low noise! Load-supporting steel expansion device.
The "CF type" is a bridge expansion device that employs a waterproof structure using elastic seals. Its tooth-shaped design minimizes shocks during travel and reduces noise. Due to factory assembly, it allows for shorter construction time, improved ease of installation, and cost reduction. It is a product that complies with the NEXCO standards revised in July 2011. There is also a snow pressure-resistant product called the "NCF type." 【Features】 - High waterproof performance due to elastic seals - Low noise for comfortable travel - Reduced construction time - Cost reduction - Compliance with NEXCO standards - Basic specifications include a secondary waterproofing material attachment type For more details, please refer to the catalog. Feel free to contact us with any inquiries.
![Expansion Device Hybrid Joint [Construction Example, Wakayama Prefecture]](https://image.www.ipros.com/public/product/image/fb9/2000330445/IPROS5863988359432612479.JPG?w=280&h=280)
We would like to introduce a case study of the hybrid joint (Type 3L), a bridge expansion device that excels in water resistance and durability.
Crittec Co., Ltd. not only sells products but often takes responsibility for installation work as well. We strive to improve our products by considering issues that arise during installation and the condition of existing expansion joints that are removed. 【Construction Example】 ○ Location: Wakayama Prefecture ○ Bridge Name: Takasegawa Bridge ○ Product: 3L-400 ○ Comment: Due to the heavy weight of the product and the windy conditions at the high-altitude site, we exercised utmost caution when lifting with a crane from below the girder and during installation. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example, Yamagata Prefecture]](https://image.www.ipros.com/public/product/image/dd9/2000353406/IPROS8112366154309278883.JPG?w=280&h=280)
We would like to introduce examples of the construction of hybrid joints (NS to LL type) for bridges, which excel in water resistance and durability.
Crittec Industrial Co., Ltd. not only sells products but often takes responsibility for installation work as well. We strive to improve our products by considering issues that arise during installation and the condition of existing expansion joints that are removed. 【Construction Case】 - Location: Yamagata Prefecture - Bridge Name: Haguro Bridge - Product: L-70 and others - Comment: Since it is an area with heavy snowfall, we covered the joint with a blue tarp for curing in preparation for concrete pouring the next day. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example, Ibaraki Prefecture]](https://image.www.ipros.com/public/product/image/9e2/2000353413/IPROS1742021933190894346.jpg?w=280&h=280)
We will introduce examples of the construction of hybrid joints (NS to LL type) for bridges, which excel in water resistance and durability.
Crittec Industries Co., Ltd. not only sells products but often takes full responsibility for installation work as well. We strive to improve our products by considering the issues that arise during installation and the condition of the removed existing expansion devices. 【Construction Example】 - Construction Location: Ibaraki Prefecture - Bridge Name: Fujimi Bridge - Product: L-60 and others - Comment: We also made calls for the safety of nearby residents and pedestrians. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example, Kyoto Prefecture]](https://image.www.ipros.com/public/product/image/985/2000371057/IPROS8210934049607582535.JPG?w=280&h=280)
We would like to introduce a case study of the hybrid joint (CF type) for bridge expansion devices, which excels in water resistance and durability.
Crittec Industries Co., Ltd. not only sells products but often takes full responsibility for installation work as well. We strive to improve our products by considering the issues that arise during installation and the condition of the removed existing expansion devices. 【Construction Example】 ○ Location: Kyoto Prefecture ○ Bridge Name: Asahi Elevated Bridge ○ Product: CF-80 and others ○ Comment: This is the installation of the NEXCO specification CF-80 type. The work was carried out with a complete road closure during concentrated construction. Measures were taken, such as preparing a tent, due to the forecast of rain. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example Kanagawa Prefecture]](https://image.www.ipros.com/public/product/image/612/2000375488/IPROS7100174659779611521.JPG?w=280&h=280)
We will introduce examples of the construction of hybrid joints (NS to LL type) for bridges, which excel in water resistance and durability.
Critic Co., Ltd. not only sells products but also often takes responsibility for installation work, striving to improve products by considering issues that arise during installation and the condition of damaged existing expansion joints that have been removed. 【Construction Case】 ○ Location: Kanagawa Prefecture ○ Bridge Name: Otake Bridge ○ Product: S-40 and others ○ Comments: The existing joint was of the slide type, and the replacement was carried out after painting and paving had already been completed. The thickness of the deck slab is approximately 200mm, so care was taken not to remove the slab during chipping and excavation, as well as during the installation of reinforcing anchors, and protective measures were taken to avoid damaging the pavement and paint. Additionally, since it is a living road used for commuting and walking, restrictions were implemented with the assistance of guides for partial regulation. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example Ehime Prefecture]](https://image.www.ipros.com/public/product/image/1ee/2000384933/IPROS973238709168925302.JPG?w=280&h=280)
We would like to introduce a case study of the hybrid joint (3L type) for bridge expansion devices, which excels in water resistance and durability.
Crittec Co., Ltd. not only sells products but often takes responsibility for installation work as well. We strive to improve our products by considering issues that arise during installation and the condition of existing expansion devices that have been removed. 【Construction Case】 - Location: Ehime Prefecture - Bridge Name: Oshima Bridge - Product: 3L-300 - Comment: Since work had to stop when boats passed under the bridge, we conducted the installation with a supervisor present. It was impressive to see many cyclists stopping on the bridge to take photos of the scenery visible from there. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example, Miyazaki Prefecture]](https://image.www.ipros.com/public/product/image/d85/2000395833/IPROS3937952712290820944.JPG?w=280&h=280)
We will introduce examples of the construction of hybrid joints (NS to LL type) for bridges, which excel in water resistance and durability.
Crittec Industrial Co., Ltd. not only sells products but often takes responsibility for installation work as well. We strive to improve our products by considering issues that arise during installation and the condition of existing expansion devices that are removed. 【Construction Example】 - Location: Miyazaki Prefecture - Bridge Name: Yamazumi Koyagawa Bridge - Product: LL-125 - Comment: This is a new construction project. Care was taken to ensure that the surface coloring material was applied evenly. For more details, please contact us or request a catalog.
![Expansion Device Hybrid Joint [Construction Example, Mie Prefecture]](https://image.www.ipros.com/public/product/image/f98/2000403900/IPROS8156379240733746938.JPG?w=280&h=280)
We would like to introduce a case study of the hybrid joint (CS type) for bridge expansion devices, which excels in water resistance and durability.
Crittec Co., Ltd. not only sells products but often takes responsibility for installation work as well. We strive to improve our products by considering the issues that arise during installation and the damage conditions of the removed existing expansion devices. 【Construction Examples】 ○ Construction Location: Mie Prefecture ○ Bridge Name: Kumikawahara Bridge ○ Product: CS-50 and others ○ Comment: This is the installation of the CS-50, which is a steel deck type. For more details, please contact us or request a catalog.
[NETIS Registered Product] Supports large expansion and contraction (200–600mm) and wide spacing (up to 1230mm). Expansion device for bridges designed with consideration for the surrounding environment.
The Hybrid Joint 3LIIA type, like the conventional Hybrid Joint 3L type, has a vertical integrated structure for the load support and anchor plate sections, resulting in high durability with almost no damage from metal fatigue. By using steel plates vertically, the exposed parts are minimized, leading to very low impact during operation, and making the product less prone to noise and vibration. It is capable of accommodating large expansion and contraction (200–600mm) and wide gaps (up to 1230mm), making it one of the largest products in the category of rubber-based joints (a general term for products other than finger joints and embedded joints). The main differences from the NEXCO specification 3LII type are that the secondary water stop material is not standard equipment (but can be installed separately) and that the painting specifications differ. The durability and water stop structure of the main body are equivalent to the NEXCO specifications. 【Features】 ○ Accommodates large expansion and contraction and wide gaps ○ High water stop performance due to the zipper structure ○ Long-term durability and maintenance-free For more details, please contact us or request a catalog.
We will introduce in detail the points to be careful about when replacing the expansion device!
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.
We will use high adhesion strength deformed rebar! A detailed introduction to the accessory "rebar" of the expansion device.
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.
The water resistance greatly varies depending on the ground cover! A detailed explanation of the shapes and types of ground cover!
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.
Once you enter everything, the selection results will be displayed automatically! We are introducing how to use it!
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.
You can easily see what products each manufacturer offers! It's recommended for those who want to compare multiple products.
"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.
![[Column] Three Types of Expansion Devices: Explanation of Features and Selection by Category](https://image.www.ipros.com/public/product/image/7ee/2001472658/IPROS95798706684031884141.png?w=280&h=280)
Introducing the types of expansion devices and explaining their features and benefits!
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.*
![[Column] Structure of Bridges: Explanation of the Names and Roles of Each Component, and Types of Bridges](https://image.www.ipros.com/public/product/image/72a/2001472669/IPROS75116383484322596835.png?w=280&h=280)
Explaining the structure of bridges and the names and roles of each component! Introducing types of bridges categorized by structure and materials.
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.*
