Highway bridge expansion joint

Abstract

The invention relates to a highway bridge expansion joint. The highway bridge expansion joint comprises a front supporting steel plate and a rear supporting steel plate, and further comprises two L-shaped steel angles, wherein the L-shaped steel angles are placed horizontally; the front supporting steel plate and the rear supporting steel plate are separately placed on the L-shaped steel angles; rubber water stopping belts are mounted between one of the two L-shaped steel angles and the front supporting steel plate and the other L-shaped steel angle and the rear supporting steel plate; a reserved hole is formed in each rubber water stopping belt; a supporting washer is arranged in each reserved hole; the L-shaped steel angles, the rubber water stopping belts, the front supporting steel plate and the rear supporting steel plate are fixed through screws; an end of the front supporting steel plate is higher than an end of the rear supporting steel plate; and height difference delta H is formed between the front supporting steel plate and the rear supporting steel plate. Owing to the height difference delta H, when a vehicle passes through the expansion joint at a normal speed, a tiredropping point is positioned on the horizontal plane of the rear supporting steel plate, thus, a bridge main body is subjected to positive pressure in the vertical direction, the impact force of tiresof the vehicle to the expansion joint is avoided, and the service lives of the expansion joint and the bridge main body are greatly prolonged.

Description

technical field [0001] The invention relates to an expansion joint, in particular to a highway bridge expansion joint. Background technique [0002] Expansion joints of highway bridges are structures specially set up during the construction of highway bridges. With the progress of the times, the number of highway bridges in my country has exceeded 800,000, and the number of expansion joints in highway bridges is even more impressive. However, most of the current highway bridge expansion joints are cantilever structures, and the stress points are relatively concentrated, which is easy to cause structural damage, and the maintenance cost is high, and the maintenance cycle is long, which often affects the normal use of the bridge. This is a great loss invisibly. . [0003] In today's expansion joints, because the space reserved for rubber waterstops is basically a cantilever structure on the horizontal plane, when the expansion joints become larger, the wheels will drive in t...

AI Technical Summary

Problems solved by technology

However, most of the current highway bridge expansion joints are cantilever structures, and the stress points are relatively concentrated, which is easy to cause structural damage, and the maintenance cost is high, and the maintenance cycle is long, which often affects the normal use of the bridge. This is a great loss invisibly.

[0003] In today's expansion joints, because the space reserved for rubber waterstops is basically a cantilever structure on the horizontal plane, when the expansion joints become larger, the wheels will drive in the center of the gap, and the tires will return to their original shape. , the wheel will also have a certain downward displacement (free fall), forming a certain impact force on the latter steel plate; at this time, the end of the expansion joint is subjected to the impact force. Under the action of the bending moment, a bending moment is formed, which produces a tensile force on the anchoring steel bar, causing the breakage at the inflection point of the steel, and even transmitting to the anchoring concrete behind, causing loosening or breaking of the concrete, and more seriously, damage to the main body of the bridge

Images