Hybrid girder cable-stayed bridge closure front girder body pre-bias pushing device

Abstract

The invention discloses a hybrid girder cable-stayed bridge closure front girder body pre-bias pushing device. The hybrid girder cable-stayed bridge closure front girder body pre-bias pushing device is characterized in that the end of a bridge abutment girder body is symmetrically provided with two concrete bases with concrete and rebars, and steel plates are embedded in the positions, corresponding to girder pushing positions, of the inside of the bases; triangular bracket supports are welded to the embedded steel plates, and force transferring columns made of steel plates are placed on the bracket supports; and jacks are lifted through lifting device bodies, the back ends of the jacks abut against the force transferring columns, and meanwhile a steel base plate is placed between the oil cylinder end of each jack and the girder body. After a low-temperature closure condition is prepared, formal pre-bias pushing is started, the two jacks synchronously conduct pushing at the constant speed till the girder body pre-bias value meets design and calculation requirements, loads are held till mid-span closure locking is completed, and the jacks are dismantled. By means of the hybrid girder cable-stayed bridge closure front girder body pre-bias pushing device, on the premise that the safety and the quality of construction are ensured, the construction period is overall shorted by two months.

Description

technical field [0001] The invention relates to a pre-deflection and pushing device for a front girder body of a cable-stayed bridge. Background technique [0002] In the closing construction of hybrid girder cable-stayed bridges, it is necessary to consider the influence of the temperature environment on the closing. Generally, the method of temperature closing is adopted, that is, the closing temperature is specified, and the width of the closing mouth at this temperature is used as the length of the closing section. This method is very important for the design closing temperature. It is very convenient to close the dragon in the environment or close to the design temperature environment. After the bridge is completed, the internal force of the beam, the cable force and the offset of the tower top are all consistent with the design; but for the closure in the low temperature environment, the forced displacement of the beam body after the bridge is completed The amount will...

AI Technical Summary

Problems solved by technology

[0002] In the closing construction of hybrid girder cable-stayed bridges, it is necessary to consider the influence of the temperature environment on the closing. Generally, the method of temperature closing is adopted, that is, the closing temperature is specified, and the width of the closing mouth at this temperature is used as the length of the closing section. This method is very important for the design closing temperature. It is very convenient to close the dragon in the environment or close to the design temperature environment. After the bridge is completed, the internal force of the beam, the cable force and the offset of the tower top are all consistent with the design; but for the closure in the low temperature environment, the forced displacement of the beam body after the bridge is completed The quantity will easily cause the additional cable force of the short cable to exceed the limit, which will affect the quality and safety of the project, which has great limitations.

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