Subway shallow-buried excavation tunnel underneath pass main traffic road pipe curtain construction method

Abstract

The invention relates to a subway shallow-buried excavation tunnel underneath pass main traffic road pipe curtain construction method. The method comprises the following steps that pipe installation is conducted, a lock catch structure is welded to the outer side of a cavity steel pipe, and a plurality of steel pipes are sequentially installed in the walking direction of the lock catch structure;secondly, field leveling is conducted; thirdly, measuring lofting is conducted; fourthly, drilling pipe jacking is conducted, a coaxial spiral drill rod penetrates through the middles of the steel pipes, a guiding measuring hole is formed in the center of the spiral drill rod, the spiral drill rod drives a drill bit to rotate, scraps are discharged out of the steel pipes through cutting residues via the spiral drill rod, steel pipe jacking and spiral soil discharging are conducted at the same time till the steel pipes are jacked in place, and various steel pipes are sequentially conducted; andfifthly, grouting is conducted, a double-liquid-slurry grouting pump is adopted for grouting, cement paste is adopted, and the grouting pressure is controlled at 0.5-1 Mpa.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for a subway shallow-buried underground excavation tunnel passing under a main traffic road pipe curtain, and belongs to the field of subway pipeline construction. Background technique [0002] With the acceleration of urbanization, the subway has been widely used in major cities. The subway lines are mostly laid along the traffic roads, which are divided into two parts: the section and the station. The station is divided into two parts: the main part and the auxiliary part. Under normal circumstances, the entrances and exits are set on both sides of the traffic road, and underground excavation is required to connect with the station hall. Due to the height limit of the station hall, the underground excavation section of the entrance and exit needs to be buried in shallow depths. The method passes through the traffic road. Due to the shallow buried depth of the excav...

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Problems solved by technology

[0002] With the acceleration of urbanization, the subway has been widely used in major cities. The subway lines are mostly laid along the traffic roads, which are divided into two parts: the section and the station. The station is divided into two parts: the main part and the auxiliary part. Under normal circumstances, the entrances and exits are set on both sides of the traffic road, and underground excavation is required to connect with the station hall. Due to the height limit of the station hall, the underground excavation section of the entrance and exit needs to be buried in shallow depths. The method passes through the traffic road. Due to the shallow buried depth of the excavation section at the entrance and exit, the surrounding rock is generally miscellaneous fill, silty clay, sand, and a small part of strongly weathered rock. At the same time, a number of municipal pressured and non-pressured pipelines are buried under the road. The distance between the bottom of the pipeline and the vault is small, and the construction method of using the pipe shed ahead of the small conduit is too risky, and problems such as surrounding rock collapse and roof fall and pipeline deformation are very likely to occur

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