Brief introduction of bridge expansion joint:
(1) Liang Duan special design
End of the beam to have enough stiffness to meet the operation process of the role of repeated loads. The design process should be used properly to the distance, to ensure the normal operation of the expansion device.
(2) reasonable selection of expansion joint device
Selection of expansion joint device is the most important is the expansion and contraction of the joint itself the stiffness and quality. We have the ideal expansion joint device must meet the following requirements:
Satisfy the displacement between the upper structure beam and the beam and the beam and the stage;
The anchoring of the telescopic device is firm and reliable, durable, and can resist mechanical abrasion and impact;
Vehicles running smoothly and comfortable;
It can prevent rain and garbage infiltration;
The installation is convenient, simple and convenient, easy to check the Platelayers operation。
At present, China's highway construction in some more expansion device type, common type rubber joints, teeth plate joints, Xi'an SD II - 80 type expansion joint, Hengshui XF 80 imitation molorexpansion joint, the Wanbao expansion joints, expansion joints and Germany TST thermoplastic elastomer and gravel filling type telescopic device etc. are analyzed according to various expansion device usage status and scope of the expansion device the most economical and reasonable.