Installation of telescopic device
Anchor width of the expansion device.
Need to sew steel reinforcement embedded in the beam (plate) specification expansion anchor width end and the abutment. Considering the coordination of the construction technology of anchor width expansion device according to the 50cm settings as appropriate, should adopt the abutment back wall width is set, it is convenient for the bridge panel, cast-in-place concrete pavement concrete construction the stability of the telescopic device also has been protected.
Anchorage reinforcement of the expansion device.
In the precast beam (plate) and the end of the back wall embedded within the expansion device of anchor bars is carried out in two different conditions. The general design is given to the width of the bridge in the center of symmetry, beam (plate) is arranged on the end of the pre buried steel, reinforced in each beam (plate) in the the embedded position is not the same, to increase the difficulty of construction, so the anchor bars should be symmetrical to each piece of beam (plate) of the center set, this should be considered in the design.
In order to ensure the construction of anchor bars. Only setting is not desirable in the pouring of concrete bridge deck 8 - 10cm thick, this fact does not allow positioning telescopic device firmly angle and beam (plate) and the back wall concrete connection into a whole, the formation of unstable risks, need construction seriously.
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.