No-balance-weight horizontal-rotation construction method of steel truss girder bridge spanning railway operating line

Abstract

The invention discloses a no-balance-weight horizontal-rotation construction method of a steel truss girder bridge spanning a railway operating line. The construction method comprises the following construction steps: 1) the design and the construction of a rotation body facility at the rotating end is conducted, wherein the rotation body facility at the rotating end comprises a rotation body running track girder and a pier top facility No.25; 2) the design and the construction of a rotation body facility at the rotating shaft end is conducted, wherein the rotation body facility at the rotating shaft end comprises a positioning shaft, a bearing arm brace, a slide ship, a slide way and a pier pillar widening structure; and 3) the design and the construction of a rotation body running mechanism is conducted, wherein a rotation process adopts a walking type incrementally-launching running mechanism, and the running mechanism comprises the slide ship, a slide groove, an incrementally-launching hydraulic oil cylinder and an incrementally-launching counterforce device. Through technical economy comparison and selection, the invention adopts the construction scheme that a steel truss girder is assembled at a high level on the lateral side of the railway operating line by using a bracket method, and the girder is lowered and emplaced after being rotated to a design position by using the no-balance-weight horizontal-rotation method.

Description

[0001] technical field [0002] The invention relates to a construction method for a steel truss girder bridge spanning a railway business line without balance weight. Background technique [0003] The extra-large bridge spans the existing railway business line. The main bridge spanning the business line is a 1-132m steel truss bridge. The bridge is located on the curve of R=4000m. . The main truss of the bridge adopts the parallel chord triangular truss under-supported ballast bridge deck steel truss girder with integral joints without vertical bars. The composite structure, the bridge deck adopts RPC concrete prefabricated slabs, fixed by wet joints and shear nails. [0004] The existing line of Jibao Railway is an electrified double-track railway, which is an important channel for coal transportation in Inner Mongolia. The traffic is heavy, the train density is high, and the average frequency of train passing is 6 min / train. In addition, the Guchengwan Super Bridge i...

AI Technical Summary

Problems solved by technology

In addition, the Guchengwan Super-Large Bridge crosses the existing line at an angle of 13°. After the completion of the bridge, the minimum clear distance between the bottom of the girder and the rail top of the existing line is only 7.22m, and the construction space is limited. Set up a huge support system, the installation and removal of the support system will greatly interfere with the existing line traffic, high safety risks, large investment, and long cycle time