Construction method for dismantling prestressed rigid diagonal member of cable-stayed bridge

Abstract

The invention discloses a construction method for dismantling a prestressed rigid diagonal member of a cable-stayed bridge. The method comprises the following steps of: stripping a section of a surrounding concrete layer from the upper end of the rigid diagonal member, and retaining the prestressed steel bundle at the part; dismantling the anchoring nodes at the lower part of the rigid diagonal member, and gradually shortening the rigid diagonal member from the lower end of the rigid diagonal member; gradually drooping the rigid diagonal member and attaching to the side surface of a bridge tower; and enabling the bridge tower to fall down toward the other side, wherein the rigid diagonal member falls down together with the bridge tower. The construction method disclosed by the invention has high safety; as the concrete layer in contact with the bridge tower can be removed in advance, the drop of the concrete layer is avoided in the dismantling process; as the prestress in the rigid diagonal member is effectively released by shortening the rigid diagonal member, the construction safety can be ensured; the construction method is economical; as the difficulty in dismantling the rigid diagonal member is shifted to the bridge tower which can be dismantled more easily, the construction cost is low, the operability is high, and the operation is simple and convenient; and moreover, the practicability is strong, the construction process is compact and the construction period is short.

Description

technical field [0001] The invention belongs to the technical field of bridge demolition construction, in particular to a construction method for demolishing prestressed rigid cable-stayed rods of a cable-stayed bridge. Background technique [0002] Cable-stayed bridge, also known as cable-stayed bridge, is a bridge in which the main girder is directly pulled on the bridge tower with multiple prestressed rigid cable-stayed rods. A structural system composed of beams and bodies. Among them, the rigid diagonal stay rod is composed of high-strength prestressed steel beams wrapped with concrete layers, and the two ends are respectively anchored on the main girder and bridge tower. When the cable-stayed bridge cannot meet the requirements of use, it needs to be dismantled. One of the commonly used demolition methods is the non-blasting method. When dismantling cable-stayed bridges by non-blasting methods, especially when dismantling prestressed rigid cable-stayed bridges by no...

AI Technical Summary

Problems solved by technology

However, whether it is directly removed from the anchor nodes at the upper and lower ends of the rigid diagonal stay or directly cut off from the lower end of the rigid diagonal stay, the prestress in the rigid diagonal stay cannot be effectively released, and the rigid diagonal stay will gradually sag after the lower part is cut off. Close to the bridge tower, at this time, the concrete layer on the upper part of the rigid diagonal stay will fall off due to the extrusion of the bridge tower, so the construction safety cannot be guaranteed

However, if the method of directly removing the rigid diagonal tie rods section by section is used, the construction area of ​​the construction machinery will be small and the efficiency will be low.

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