Bridge expansion joint: refers to meet the requirements of bridge deck deformation, usually in the two beam ends, between Liang Duan and abutment or bridge hinge position to set expansion joints. 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 setting of expansion joints, the railing and deck pavement should be disconnected.
The function of bridge expansion joint is to adjust the displacement and connection between the superstructure caused by the vehicle load and the bridge building material. Once the telescopic device of the skew bridge is destroyed, it will seriously affect the speed, comfort and safety of the vehicle, and even cause safety accidents.
According to the performance and installation method, the expansion joint can be divided into GQF-C, GQF-Z, GQF-L and GQF-F.
The GQF-MZL model number mode bridge expansion joint device is a bridge expansion joint device designed by the hot rolled integral shaped 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.
GQF-C type bridge expansion device features:
Type GQF-C bridge expansion device adopts whole hot rolled 16Mn shaped steel, overcome the extrusion special-shaped steel straightness and set size uneven, low building height, homemade hot rolled profiled steel forming the overall height of only 50mm, has the advantages of simple structure, convenient installation, with comfort and durability, reliability obvious. It is convenient for the replacement of the old telescopic device, and it can also be used for the new bridge.
GQF-MZL type bridge expansion device features:
The structure of the MZL expansion device is characterized by a series of telescopic devices consisting of a side beam, a middle beam, a beam, a displacement control system, a sealed rubber belt and so on. Apart 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, and can achieve the uniform displacement, so that all beams in a displacement control box are supported on the same vertical beam of the traditional method, so on large displacement expansion device is very favorable, reducing the number of beams, the displacement of the control box volume is reduced to the minimum, saving steel.
The structure also overcomes the harsh conditions that the inclined supporting telescopic device requires high accuracy in processing and assembly. Otherwise, the four link structure is prone to self locking phenomenon, which affects the expansion and freedom and is not easy to ensure uniform displacement. The structure of the structure is both rotating and sliding. Therefore, the flexural, slope, oblique and wide bridges have strong adaptability, which can meet the requirements of the use of various bridge structures.