Reverse dragging device for construction of dragging large-span steel braced girder

Abstract

The invention discloses a reverse dragging device for construction of dragging a large-span steel braced girder. The reverse dragging device comprises a temporary support and a winch, wherein the temporary support is provided with a slide way with a groove-shaped cross section, a crawler-type conveyor capable of sliding along the slide way is arranged in the slide way, the steel braced girder is arranged on the crawler-type conveyor, the upper portion of the front end of the temporary support is provided with a fixed pulley block, and a hauling cable wound on the winch bypasses the fixed pulley block and is connected with the front end of the steel braced girder via a movable pulley block. The reverse dragging device for the construction of dragging the large-span steel braced girder is simple in structure, reasonable in design, good in bearing performance, safe, reliable, high in construction efficiency, high in practicability and worthy of popularization and application.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a reverse pulling device for dragging construction of large-span steel truss girders. Background technique [0002] The steel truss girder dragging method construction is to assemble the steel truss girders on the embankment at the bridge head or on the scaffolding, and set up a slideway on the steel truss girders, set a glideway on the embankment or scaffolding, and pass through the rollers between the upper and lower girders. Drag the steel truss girder to the predetermined bridge hole, and drop the girder into place. The drag method construction has the obvious advantage of less interference to the traffic under the bridge, and is a common method for the construction of steel truss beams spanning existing railway and highway business lines. [0003] The slideway and the drag system are important stress-bearing structures in the dragging construction. Wh...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defects existing in the prior art, the present invention provides a reverse pulling device for dragging construction of large-span steel truss girders, which solves the complex internal force changes of steel truss girder members in traditional dragging construction, and the longitudinal tension of steel truss girder members. The stability is not easy to maintain; the slideway is easy to deform, the stability is poor, and it is difficult to drag and rectify; the disadvantages are great hidden dangers to traffic safety under the bridge.

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