What are the characteristics of modular multi joint expansion device
Composed of edge beams, multiple middle beams, supporting crossbeams, displacement control mechanism, and V-shaped rubber sealing tape; The expansion and contraction of a single unit is 80mm, and by increasing the number of middle beam groups, the total expansion and contraction can reach 160-2000mm, suitable for large displacement bridges.
Composed of edge beams, multiple middle beams, supporting crossbeams, displacement control mechanism, and V-shaped rubber sealing tape; The expansion and contraction of a single unit is 80mm, and by increasing the number of middle beam groups, the total expansion and contraction can reach 160-2000mm, suitable for large displacement bridges.
Main advantages
1. Modularity and large scalability
By using multiple sets of joint stacking, the number of middle beams can be increased or decreased according to the displacement calculation of the bridge, which is suitable for large-span continuous beams, cable-stayed bridges, and super large bridges with large deformations; It can adapt to longitudinal expansion, slight lateral displacement, and slight vertical settlement simultaneously.
2. Clear division of labor in the force system and strong carrying capacity
The vehicle load is borne by the special-shaped steel middle beam and side beam, and the load is transmitted to the beam body through the crossbeam; The load-bearing structure and displacement control system are independent of each other, do not interfere with each other, and have good fatigue resistance under heavy load and high-speed working conditions.
3. Automatic and uniform control of seam width
By relying on displacement control box/control spring linkage, the gaps of each group are automatically adjusted during temperature expansion and contraction to ensure that the opening of each gap is basically equal, and there will be no local gaps that are too wide or squeezed or stuck.
4. Good sealing and waterproof performance, easy maintenance
V-shaped EPDM rubber waterstop is embedded in the steel groove to prevent water and dust; The rubber band can be replaced separately, and the sealing components can be replaced without dismantling the entire steel structure, reducing the cost of major repairs.
5. Smooth driving and low noise
The top surface of the steel section is flush with the bridge deck pavement, which reduces the impact of vehicles passing through and provides better driving comfort than comb teeth and plate type expansion devices, making it suitable for high-speed and urban expressway bridges.
6. High overall stiffness and good durability
Metal components are hot-dip galvanized for corrosion resistance, which can adapt to corrosive environments such as coastal areas and snow salt spraying; The overall prefabrication in the factory and on-site hoisting in place result in high installation efficiency.
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