Bridge expansion joints: to meet the requirements of bridge deck deformation, the expansion joint is usually installed between the two beam ends, between the Liang Duan and abutment or the hinge position of the bridge. Requirements of expansion joints in two directions parallel and perpendicular to the axis of the bridge, can free expansion, firm and reliable, the vehicle had to be smooth, no sudden jump and noise; to prevent rainwater and waste soil infiltration obstruction; installation, inspection, maintenance, eliminate dirt to be simple. At the expansion joint, the railing and the bridge deck should be disconnected.
The role of bridge expansion joints is to adjust the displacement and connection between the superstructure caused by the vehicle load and the bridge building materials. Once the telescopic device of the skew bridge is damaged, it will seriously affect the speed, comfort and safety of the train, and even cause traffic accidents.
According to the performance and installation method, the expansion joint can be divided into GQF-C, GQF-Z, GQF-L and GQF-F types.
The bridge expansion joint device of GQF-MZL number model is a bridge expansion joint device which is made of hot-rolled profiled steel. GQF-C type, GQF-Z type, GQF-L type, GQF-F type jointless bridge joint device is suitable for the expansion of the following 80mm, GQF-MZL type expansion joint device is composed of modular bridge expansion edge beam, beam, beam and linkage mechanism joint device, suitable for large and medium span bridge expansion 80mm-1200mm.
The characteristic of the GQF - MZL type expansion device is separated from the expansion device of bearing structure and displacement control system, the two forces do not interfere with each other, a clear division of labor, so as to ensure the safety of the force, but also ensure the uniform stress displacement.
The value of direct influence on the choice of expansion device specification calculation of bridge expansion volume, if the expansion device specification selection is not reasonable, it directly affects the use effect of expansion device at the same time, expansion device should be taken into consideration when the beam and plate expansion device gap size, to ensure the expansion device has sufficient anchorage and beam, both ends of the board, in order to achieve the best use effect. Therefore, in the selection of telescopic device specifications, we must leave enough margin, in order to ensure the use and durability of telescopic device.