Examples of Installation of Expansion Devices | Keiji Bypass / Keihan Overpass [Crittec Industries]
Continuous adoption on Meishin Expressway and Keiji Bypass. A large expansion joint with a proven durability of 100 years【Hybrid Joint Type 3LII】.
We would like to introduce a case study of the hybrid joint (3LII type) for bridge expansion devices, which excels in water resistance and durability. 【Case Study 1】 - Location: Kyoto Prefecture (Keiji Bypass, Keihan Overpass) - Client: Kyoto Expressway Office - Project Name: FY 2023 Replacement Work for Expansion Devices within the Jurisdiction of Kyoto Expressway Office - Construction Period: September 2024 - Product: Hybrid Joint 3LII-350 【Case Study 2】 - Location: Kyoto Prefecture (Keiji Bypass, Keihan Overpass) - Client: Kyoto Expressway Office - Project Name: FY 2023 Replacement Work for Expansion Devices within the Jurisdiction of Kyoto Expressway Office - Construction Period: November 2025 - Products: Hybrid Joint 3LII-150, 3LII-160 - Comment: The high evaluation of the construction results in 2024 led to continued adoption for the following year's project. The replacement with product joints has achieved water resistance, durability, and low noise. The standard specifications of non-drainage structure and secondary water stop materials have significantly reduced the risk of leakage under the girders. For more details, please contact us or request a catalog.
basic information
**Features** 1) Ultra-long durability of 100 years: Achieved 12 million cycles in fatigue loading tests by a third-party organization, proving 100 years of durability. 2) Long-term waterproofing of 50 years: Proven waterproofing performance equivalent to 50 years through tests by a third-party organization. Secondary waterproofing material is standard specification. 3) Large expansion and contraction capacity for wide gaps: One of the largest expansion capacities among NEXCO-approved products. Capable of accommodating expansion from 150mm to 350mm, and maximum gap of 730mm. 4) Ultra-low noise and vibration-free: A vertical integrated structure with 32mm thick steel plates arranged vertically and alternately, making it difficult for air vibrations to transmit under the girder, reducing noise. Provides smooth and comfortable driving. The small wheel load support interval minimizes impact vibrations during travel. 5) Easy to install: Can be constructed without road closures by regulating lanes shared on one side, applicable for both new installations and repairs. Lighter compared to conventional large products. 6) Maintenance-free: The load support plate and anchor plate have a vertical integrated structure with high durability. Additionally, the structure prevents damage from metal fatigue, allowing for visual maintenance management. Visual inspections are sufficient, eliminating the need for regulated sound inspections. 7) NETIS registered: This new technology is registered in the Ministry of Land, Infrastructure, Transport and Tourism's database system "NETIS." Registration No. KT-210067-A.
Price range
Delivery Time
Model number/Brand name
3LII-150，160，200，250，300，350, 400, 450, 500
Applications/Examples of results
NEXCO, the Ministry of Land, Infrastructure, Transport and Tourism, urban expressways, and various public organizations such as local governments have adopted this product widely across the country. This product has passed the water stop test and durability test conducted by NEXCO.
Related Videos
Line up（9）
| Model number | overview |
|---|---|
| 3LII-150 | Expansion amount 150mm (±75mm) |
| 3LII-160 | Expansion and contraction amount 160mm (±80mm) |
| 3LII-200 | Expansion amount 200mm (±100mm) |
| 3LII-250 | Expansion amount 250mm (±125mm) |
| 3LII-300 | Expansion amount 300mm (±150mm) |
| 3LII-350 | Expansion amount 350mm (±175mm) |
| 3LII-400 | Expansion amount 400mm (±200mm) |
| 3LII-450 | Expansion amount 450mm (±255mm) |
| 3LII-500 | Expansion and contraction amount 500mm (±250mm) |
catalog（4）
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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.
