Construction method for replacing old frame bridge by new frame bridge in existing railway lines

Abstract

The invention relates to a construction method for the new frame bridge to replace the old frame bridge on the prior railway. The construction method comprises the required jacking force of the old frame bridge according to the formula; the prior railway line is strengthened; the line strengthening system and the reinforcing steel drawing ring are tightened through a jack; the lately supplemented triangular blocks is arranged at the rear end of the bottom plate of the old frame bridge; a cantilever bracket is arranged; a new bridge back is arranged, and a jacking column and a jacking pickaxe are respectively arranged between the new frame bridge and the new bridge back and between the old frame bridge and the cantilever bracket; a plurality of thixotropic slurry holes are formed on the both sides of the old frame bridge and the bottom surface of the bottom plate, and thixotropic slurry is filled into the thixotropic slurry holes; the old frame bridge is jacked out; when the old frame bridge is jacked out, the new frame bridge is jacked in. Under the precondition that the railway operation is not interrupted, the construction method can rapidly jacked the old frame bridge out, the application scope is wide, and the construction method can not be limited by time and space. In addition, because the conventional reinforcement method of track lock plus the longitudinal and horizontal beam is adopted in the prior railway line, the construction method is suitable for various railway situations such as a straight line section and the curved line section, and the security is high.

Description

technical field [0001] The invention belongs to a railway engineering construction method, in particular to a construction method for replacing an old frame bridge with a new frame bridge under an existing railway line. Background technique [0002] Frame bridges are usually set at the intersection of railway lines and roads, and are mainly composed of roof panels, side panels (side walls), bottom panels and auxiliary facilities. Wherein the existing railway line is set on the top surface of the frame bridge, and the road at the bottom of the frame bridge is perpendicular or oblique to the railway line. With the rapid progress of urbanization and the improvement of people's material living standards, some existing public transportation facilities can no longer meet the needs of the rapidly developing society. common items. Roads can be widened to reduce traffic jams. However, the narrow frame bridge under the existing railway line has become a bottleneck for the smooth flo...

AI Technical Summary

Problems solved by technology

However, this method is difficult to apply for blasting operations, and at the same time, the blasting quality is not easy to control, which has a great impact on the surrounding environment and poor safety.

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