Specs: D60 D80 D180

Bridge expansion joint refers to the expansion joint usually set between two beam ends, between beam ends and abutment, or at the hinged position of the bridge to meet the requirements of bridge deck deformation. It is required that the expansion joint can expand freely in two directions parallel and perpendicular to the bridge axis, be firm and reliable, and the vehicle shall travel smoothly without sudden jump and noise; It shall be able to prevent rainwater, garbage and dust from penetrating and blocking; Installation, inspection, maintenance and elimination of dirt shall be simple and convenient. At the place where the expansion joint is set, the railing shall be disconnected from the bridge deck pavement.

The function of the bridge expansion joint is to adjust the displacement and connection between superstructure caused by vehicle load and bridge-building materials. Once the expansion device of the 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 type, steel support type, combined shear-type (plate type), modulus support type, and elastic device.

The butt joint expansion joint device can be divided into filling butt joint type and embedded butt joint type according to its structural form and stress characteristics. The filling and docking expansion device is to fill the gap with asphalt, wood, oakum, rubber, and other materials, and the expansion body is in a compressed state under any circumstances. This kind of expansion device is generally used in conventional bridge engineering with an expansion amount less than 40mm, but it is rare. The embedded butt expansion joint device uses different forms of steel structure to firmly embed and fix the rubber strips (strips) of different shapes and absorbs the deformation of the beam body by the tensile and compressive deformation of the rubber strips (strips), and the expansion body can be in a compressed state. It can also be in tension.

TNow, to reduce seismic hazards, expansion joints also play a role in preventing excessive displacement in the bridge area. In short, it is a device to buffer displacement.

Application of bridge expansion joint

Bridge expansion joint: to meet the requirements of bridge deck deformation, expansion joints are usually set between the two beam ends, between the beam ends and the abutment, or at the hinge position of the bridge. The expansion joints are required to be free, firm, and reliable in both directions parallel and perpendicular to the bridge axis, and the vehicles shall travel smoothly without sudden jump and noise; it shall be able to prevent rainwater, garbage, and dust from penetrating and blocking; Installation, inspection, maintenance and removal of dirt shall be simple and convenient. At the place where the bridge expansion joint is set, the railing and bridge deck pavement shall be disconnected. Expansion joints shall be used in: bridges, sidewalks, highways, expressways, high-speed railways, subways, viaducts, buildings, and other sections.