The manufacturer and seller of bridge bearings tell you what the bridge expansion joint is and what its function is

Bridge expansion joint refers to the expansion joint usually set between two beam ends, between beam ends and abutment or at the hinge position of the bridge to meet the requirements of bridge deck deformation. It is required that the expansion joint can freely expand and expand in two directions parallel to and perpendicular to the bridge axis, and it is firm and reliable. The vehicle shall be smooth and free of sudden jump and noise when it is running; It shall be able to prevent rainwater and garbage from seeping into and blocking; Installation, inspection, maintenance and removal of dirt should be simple and convenient. At the place where the expansion joint is set, the handrail and the deck pavement shall be disconnected.

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The function of bridge expansion joint is to adjust the displacement and connection between superstructure caused by vehicle load and bridge construction materials. Once the expansion device of skew bridge is damaged, it will seriously affect the speed, comfort and safety of driving, and even cause driving safety accidents.

Bridge expansion joints generally include butt joint, steel bearing type, combined shear type (plate type), modulus bearing type and elastic device.

Butt type expansion joint device can be divided into two types according to its structural form and stress characteristics: plug type and embedded type. The filling and docking expansion device is used to fill the gap with asphalt, wood, oakum, rubber and other materials, and the expansion body is under pressure under any circumstances. This type of expansion device is generally used in conventional bridge works with expansion amount less than 40mm, but it is rare. The embedded butt expansion joint device uses steel members of different shapes to embed and fix the rubber strips (strips) of different shapes, and absorbs the deformation of the beam body with the tensile and compressive deformation of the rubber strips (strips), and its expansion body can be in the compression state. It can also be in tension.

Now, in order to reduce earthquake damage, expansion joints also play a role in preventing excessive displacement in the bridge area. In short, it is a device for buffering displacement.

The above is the content of the bridge expansion joint introduced by the manufacturer and seller of the bridge bearing. If there is anything unclear, you can leave a message or contact us.