Bridge expansion joints: refers to the deformation of the bridge to meet the requirements, usually between two end of the beam, or set the position articulated joints on the bridge between the end of the beam and the abutment. Require expansion joints in parallel, perpendicular to the axis of the bridge in both directions, can freely scalable, secure and reliable vehicle should be smooth too, no sudden jump and noise; to be able to prevent the infiltration of rainwater and garbage soil obstruction; installation, inspection, maintenance eliminate the dirt to be simple and easy to use. Set expansion joints, railings and the bridge deck to be disconnected. Bridge expansion joints role: that of the upper structure by adjusting the vehicle load and bridge materials arising between the displacement and bonding. Skew Bridge telescopic device is damaged, it will seriously affect traffic speed, comfort and safety, and even cause traffic accidents. One end of the beam bridge expansion joints specially designed beam ends must have sufficient rigidity to meet the operational role during repeated loading. The design process to adopt proper stretching distance to ensure the normal operation of the telescopic device to use. 2 rational use of bridge expansion joints expansion joint device selection is the most important bridge expansion joint device telescopic device itself stiffness and mass. Ideal expansion joint device must meet the following requirements: (1) meet the displacement between the upper beam and structural beams and between the beam and Taiwan; (2) anchoring telescopic device is solid and reliable, durable, resistant to mechanical wear, Collision; (3) the vehicle stable and comfortable; (4) to prevent the infiltration of rainwater and garbage; convenient (5) installation, simple and easy to inspect and easy to track maintenance workers operate. 3 bridge expansion joints installed telescopic device (1) Anchoring telescopic device width bridge expansion joints need to standardize embedded steel expansion joints in the beam (plate) ends and abutments anchoring width. Taking into account the construction process of coordination, anchor width 50 cm telescopic device according to the appropriate setting for the bridge table should be used to set the width of the back wall, which not only facilitates the deck, in-situ concrete pavement construction, but also the Stability telescopic device has been secured. Anchor bars (2) telescopic device in precast beam (plate) and the end of the back wall anchor bars telescopic device is buried under two different circumstances. www.grxjgc.com given are generally designed to bridge the wide center of symmetry in the beam (plate) end portion embedded steel is embedded in every piece of steel beam position (board) are not the same inside, to the construction more difficult, and therefore should be anchored to the center of each piece of steel beams (board) of symmetrical set, this should give full consideration in the design. Construction to ensure the role of anchor bars. Setting is desirable only in pouring 8 ~ 10 cm thick concrete deck, this fact does not make the positioning angle telescopic device securely with the beam (plate) and the back wall of concrete linked into a whole, the formation of unstable risks, take seriously the need to construction. Positioning angle orientation angle (3) telescopic device telescopic device must be installed in accordance with the measured temperature when you want to calculate the amount of stretching joints to adjust the distance between the two orientation angles, press deck height positioning angle iron welded to the embedded steel, such a strict control of the seam away. For expansion joint spacing, multi holders rather small not big tendency, which is absolutely unacceptable. www.grgcxj.com orientation angle near the concrete in the construction of the more difficult vibrators, and steel-intensive parts of the dead should be strengthened artificially inserted pound. www.grgcxj.cn www.grxjgs.com www.hsgrgc.com 

palabras clave: Bridge expansion joints, Modular bridge expansion joints, highway bridge expansion joint device,