High-strength anti-fatigue modular bridge expansion device and construction method

Abstract

The invention discloses a high-strength anti-fatigue modular bridge expansion device and a construction method. The high-strength anti-fatigue modular bridge expansion device comprises a roadway displacement box; boundary beams are correspondingly arranged on the two sides of the roadway displacement box; a plurality of anchor plate welding pieces are uniformly distributed on the external side walls of the boundary beams; one or multiple center sills are arranged between the two boundary beams; cross beams perpendicular to the center sills horizontally penetrate into the roadway displacement box; the high-strength anti-fatigue modular bridge expansion device is characterized in that upper expanded special supporting cushion blocks are welded and connected between the center sills and the cross beams; at least one center sill supporting rib plate is fixedly arranged on the two sides, in the length directions of the center sills, of the upper expanded special supporting cushion blocks; the top edges of the center sill supporting rib plates are welded to the center sills; and the side edges of the center sill supporting rib plates are welded and connected to the cross beams. In the construction process, the upper surfaces of the upper expanded special supporting cushion blocks are connected with the center sills in a full-length welding manner. The high-strength anti-fatigue modular bridge expansion device has the advantage that strength and anti-fatigue requirements of national regulations on the bridge expansion device can be satisfied through calculation.

Description

technical field [0001] The invention relates to the field of bridge connecting parts and construction, in particular to a high-strength anti-fatigue modulus bridge expansion device and a construction method. Background technique [0002] In order to adapt to changes in the length of the bridge structure caused by factors such as thermal expansion and cold contraction, expansion devices need to be installed at both ends of the bridge, and the modular expansion device is a commonly used bridge expansion joint device. like figure 1 As shown, the modular expansion device includes structures such as side beams, middle beams, and cross beams. By adjusting the gap width between side beams and beams, and between beams (in the case of multiple beams), it can adapt to the expansion of the bridge structure. shrink. The modular bridge expansion joint device is simple in structure and convenient in construction, and is widely used in engineering. However, due to the expansion joints p...

AI Technical Summary

Problems solved by technology

In the traditional modular bridge expansion device, the middle beam and the cross beam are usually welded and connected by a rectangular support pad. The upper surface of the support pad is flat. Heat penetration, during the penetration process, it is easy to form welding defects such as incomplete penetration, incomplete fusion, and slag inclusion, which will affect the overall strength of the structure

After welding, the supporting pads are as image 3 , the shape is close to a cuboid. As can be seen from the figure, the maximum stress is at the welding feet on both sides, which is 397MPa, which exceeds the yield limit of the material by 345MPa, and far exceeds the pulsating failure strength of the material by 281MPa, so it is easy to fatigue damage

Images