| After-sales Service: | Technical Guidance |
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| Warranty: | 1 Year |
| Certification: | DIN, JIS, GB, BS, ASTM, AISI |
| Function: | Protect, Expansion and Contraction |
| Position: | Upper Structure |
| Type: | Telescopic Device |
| Samples: |
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| Customization: |
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Audited Supplier Modular single seam has good durability, comfort, and reliability. Due to its low structural height, it is particularly suitable for the renovation of old bridge expansion devices, and can also be used for the construction of new bridges. Its allowable expansion and contraction amount is 20-120mm, generally C40, C60, C80, D40, D60, D80, D100, D120, and the main structural forms are C type, F type, Z type, E type, and M type.
Reasonable selection of appropriate expansion and contraction gaps is extremely important, as the larger the gap, the more susceptible the expansion device is to damage. The gap used is too large or too small, and the gap was not adjusted considering the temperature during installation. Especially for plate type rubber expansion devices, they are prone to damage. Even continuous bridge decks often have cracks on the surface layer pavement. Therefore. It is necessary to pre cut the bridge deck, set joints, or use a softer pavement layer to absorb cracks, or install small expansion devices to solve the problem. In the case of larger longitudinal slopes, without considering the construction that adapts to vertical displacement, it is also easy to produce defects and cause damage. The expansion device runs along the longitudinal direction of the bridge deck, and even with small expansion, there is still a problem of large deflection difference. Therefore, attention should be paid to the construction of the expansion device. The combination of the expansion device and the beam body into an equally strong whole is undoubtedly an important means to improve its efficiency. Other types of bridge expansion devices, except for modular expansion devices, often have insufficient fixation and integration with the bridge deck, resulting in less than ideal results. Generally, the structural dimensions are small, the stiffness is insufficient, and the research on the characteristics and coordination of new materials is not in-depth enough. Therefore, sufficient comparative research should be conducted when selecting the type. To prevent water leakage caused by rainwater, although in some steel expansion joint devices, sealing rubber is inserted into the matching parts or drainage devices or pavement layers are used as easy to clean forms, or waterproof materials are poured into the entire gap as a practical form. For rainwater on the bridge deck, a centralized drainage outlet should generally be set up near the expansion device; For components that are not painted multiple times during daily maintenance, high-quality and durable protective materials should be used for effective treatment in the design.
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Audited Supplier 
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