Expandable device [Hybrid Joint] 3LIIA type
[NETIS Registered Product] Supports large expansion (200-600mm) and wide spacing (up to 1230mm). Contributes to the longevity of bridges and reduces lifecycle costs.
The Hybrid Joint 3LIIA type has a vertical integrated structure for the load support and anchor plate sections, making it highly durable and preventing damage from metal fatigue. A fatigue loading test conducted using actual products by a third-party organization confirmed a service life of 100 years, demonstrating durability for 100 years. This 100-year durability aligns with the design service life of bridges. Unlike conventional products that require replacement of expansion devices 3 to 4 times, this product can be used without any replacements, significantly reducing lifecycle costs. By using steel plates vertically, the exposed parts are minimized, resulting in very low impact during operation, and making it less likely to generate noise and vibration. It is a product capable of accommodating large expansion and wide spans, and it is 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 waterproofing material is not standard equipment (but can be installed separately) and that the painting specifications differ. The durability and the waterproof structure of the main body are equivalent to the NEXCO specifications.
basic information
【Features】 ○ Supports a large expansion range (200–600mm) and wide spacing (up to 1230mm) ○ Compatible with all types of bridges ○ Ultra-low noise and comfortable driving ○ Ultra-long durability of 100 years and maintenance-free ○ High water-tightness for 50 years due to the fastening structure ○ Safe and easy installation (product height is low and relatively lightweight) ○ Replaceable ○ Economical ● For more details, please contact us or request a catalog.
Price range
Delivery Time
Model number/Brand name
3LIIA-200，250，300，350，400，450，500，600
Applications/Examples of results
The Ministry of Land, Infrastructure, Transport and Tourism, NEXCO, urban expressways, and local governments, among other public organizations, have adopted this product nationwide. This product has passed the water stop test and durability test conducted by NEXCO.
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Line up（8）
| Model number | overview |
|---|---|
| 3LIIA-200 | Expansion amount 200mm (±100mm) |
| 3LIIA-250 | Expansion amount 250mm (±125mm) |
| 3LIIA-300 | Expansion amount 300mm (±150mm) |
| 3LIIA-350 | Expansion amount 350mm (±175mm) |
| 3LIIA-400 | Expansion amount 400mm (±200mm) |
| 3LIIA-450 | Expansion and contraction amount 450mm (±225mm) |
| 3LIIA-500 | Expansion amount 500mm (±250mm) |
| 3LIIA-600 | Expansion amount 600mm (±300mm) |
catalog（5）
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News about this product（2）
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Crittec Industries receives the "Shinkin Central Bank Chairman's Award" at the Shinkin Excellent Company Awards - Selected for high evaluation of its 100-year durability bridge expansion devices and social contribution activities.
Crittec Industries, a manufacturer of expansion devices for bridges, received the "Chairman's Award of the Shinkin Central Bank" at the "2026 Shinkin Excellent Company Awards" held on March 16, 2026. This award is a system that selects outstanding companies from among the business partners of 23 Shinkin banks in Tokyo. Our company was nominated as a representative of approximately 20,000 business partners of Shiba Shinkin Bank and received the award after a rigorous screening process. The development of the bridge expansion device "Hybrid Joint Type 3LII," which achieves a durability of 100 years, was highly evaluated for its contribution to reducing maintenance costs through lower replacement frequency, as well as its role in mitigating social costs such as traffic regulations. Additionally, our social contribution activities, including the utilization of senior talent, promotion of health management, and the implementation of the experiential learning program "Crittec Academy" for elementary school students, were also comprehensively recognized. With this award as a catalyst, our company will strive for technological innovation and quality improvement aimed at realizing sustainable social infrastructure and creating further value.
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We will exhibit at the Construction Technology Expo 2022!
We have decided to exhibit at the "Construction Technology Exhibition 2022 Kanto"! The Construction Technology Exhibition 2022 Kanto (C-Xross2022) will be held from November 16 to 17, 2022, at the Sunshine City Exhibition Hall. It will also be conducted online from November 16 to December 28. We plan to showcase a model of the "Hybrid Joint 3LII Type." Our booth number is D-53, located at the corner of the second-floor venue, near the exit. Since it will be a relatively small booth, don't miss it! (laughs) Many employees, mainly from the construction department, are expected to participate on the day, so we look forward to your questions and requests. If you're in the area, please stop by!
Distributors
CRETEC, a company under Crittec Industries, was born from the combination of Create (creation) and Technology. As a comprehensive manufacturer of bridge expansion devices, we continue to develop expansion devices that contribute to the longevity of bridges and environmental protection. Moreover, we do not stop at product manufacturing; by consistently handling everything from research, design, manufacturing, sales, to construction in-house, we can manufacture and install expansion devices that meet the requests of our clients and general contractors, as well as the conditions and environments of the bridges and roads on-site. We also take into account the issues that arise during the installation of expansion devices and the damage conditions of existing devices that are removed, using this information to improve and develop our products. Please feel free to contact us for inquiries about bridge expansion devices, requests for materials, or estimates. ◆ What is a bridge expansion device? It is a component installed in the gap between the bridge abutment and the bridge girder, or between bridge girders. When designing a bridge, it is necessary to create a gap to prevent the bridge girders from colliding due to expansion and contraction caused by temperature changes. The bridge expansion device is required to cover this gap and ensure safe passage for vehicles and pedestrians.
