Railway construction method of dismantling existing girder bridge and pushing frame structure in situ

Abstract

The invention relates to a railway construction method of dismantling an existing girder bridge and pushing a frame structure in situ. The method of conducting pushing after removing beams is adopted for construction, the position for a beam containing platform is reserved when the frame structure is prefabricated, the upper line and the lower line of a railway line are simultaneously reinforced, beam moving is conducted on the upper line and the lower line independently in the beam moving process, substitute I-beams are used for supporting the railway line after beam bodies are removed, the substitute I-beams are dismantled one by one while pushing is conducted, beam removing is conducted through night skylight closing points, the beams on the lower line are removed at a time from the lower line side, the beams on the upper line are removed at a time from the upper line side, the skylight closing points are occupied once when the beams on the upper line are removed and once when the beams on the lower line are removed, and the skylight closing points are closed for three hours each time. When the construction method is used, the railway operation of each railway line only needs to be interrupted for a short period of time, the operation is convenient, the construction cost is low, and it can be ensured that the influences on the railway operation are reduced to the maximum degree.

Description

technical field [0001] The invention relates to a construction method for adding frame-type bridges and culverts to existing railway lines. Background technique [0002] Due to the uninterruptible operation of existing railways, when adding frame-type bridges and culverts to existing railway lines, the jacking method is often used, that is, prefabricated frame-type bridges and culverts on the side of the existing railway, and after the main body strength of the bridge reaches 100% of the design strength, excavation begins. Soil jacking, jacking while digging, and finally reaching the frame bridge in place according to the design. [0003] In the reconstruction of existing railways, it is often encountered that existing non-standard bridges are rebuilt into frame bridges in situ. There are two conventional construction methods. One is to block the line for 36 hours, remove the line, remove the bridge, and jack the frame structure. Put in place and restore the railway line. D...

AI Technical Summary

Problems solved by technology

[0003] In the reconstruction of existing railways, it is often encountered that existing non-standard bridges are rebuilt into frame bridges in situ. There are two conventional construction methods. One is to block the line for 36 hours, remove the line, remove the bridge, and jack the frame structure. Put in place and restore the railway line. Due to the long blockade time, it is impossible for busy railways to be interrupted for a long time. This method is suitable for railways that can be interrupted for 36 hours or more, such as special railway lines, so the scope of application is very small

The second is to use special D beams for railways to reinforce the line, remove the bridge, and then jack the frame structure. This method does not interrupt the railway operation and is safe for construction, but it is suitable for single-track railways and double-track railways with a line spacing of more than 5m, and the line spacing is 5.0m. The following double-track railways cannot be used. According to the railway design specifications, the line spacing of existing railways in my country is generally 5.0m at stations and 4-4.5m in intervals. Therefore, D beams cannot be used to reinforce lines in most double-track sections

[0004] The scope of application of the above two conventional construction methods is relatively small, and most railway reconstruction sites cannot be used. This poses a new construction problem for us. It is urgent to study a new construction method, which requires little impact on the operation of the railway. Suspension of railway operation for a long time, but also applicable to various double-line spacing conditions, so as to be safe, convenient and economical

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