A construction method for the demolition of a long-span highway suspension bridge

Abstract

The invention discloses a demolition construction method for long-span highway suspension bridges. The construction method specifically comprises the following steps that 1, steel structure counter-force frames are installed at the top of a main tower, cable saddling and pushing are conducted, and the deflection of the main tower is corrected; 2, bridge surface plates and bridge surface paving layers are cut, and blocking and whole hoisting are conducted; 3, demolition of steel truss beams is conducted, and after the steel truss beams are cut off from the midspan, the beams are lowered in a segmental mode as a whole; 4, demolition of main cables are conducted, remaining main cable hangings and catwalks are utilized as an operation platform, the main cables are cut off in situ, and the demolition of the main cables is conducted; 5, demolition of the main tower is conducted, diamond wire saws are utilized to cut reinforced concrete with static force, upper cross beams are lowered as a whole through the adoption of a suspension system, after the main tower is cut and divided into blocks, vehicle cranes are used for hoisting, and cutting and hoisting are conducted after holes are drilled in lower cross beams. The demolition construction method for the long-span highway suspension bridges is applicable to the complex demolition of suspension bridges in geological environment, and the construction method is not only relatively little in resource waste and relatively low in economic cost, but also conductive to environmental protection.

Description

technical field [0001] The invention relates to a construction method for dismantling a long-span highway suspension bridge, and belongs to the technical field of bridge construction. Background technique [0002] The suspension bridge is currently the bridge type with the strongest spanning ability in the world. It originated in China, was innovated in the United Kingdom, and developed in the United States and Japan. Due to the complex structure of the suspension bridge, its construction technology is also very difficult. The construction of modern suspension bridges in my country started relatively late. Before the 1990s, only some suspension bridges with small spans, narrow widths, and low load standards were built. After the 1990s, modern suspension bridges in my country developed rapidly. During the year, more than a dozen long-span suspension bridges with their own characteristics were built, such as the Shantou Bay Bridge and the Xiling Yangtze River Bridge. Since th...

AI Technical Summary

Problems solved by technology

[0005] For a complex bridge type such as a long-span suspension bridge, its demolition construction has no precedent in China, and the construction technology is difficult and risky

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