Construction method for jointly building underground fast road and rail traffic interval under urban main road

Abstract

The invention discloses a construction method for jointly building an underground fast road and a rail traffic interval under an urban main road. The construction method comprises the following stepsthat 1, the construction of an underground continuous wall is carried out, an inclined tube is pre-buried, and cement stirring piles and anti-sinking piles are applied; 2, a soil body is excavated, supports are sequentially applied, and after the soil body is excavated to the bottom of a large foundation pit, the soil body is excavated to the bottom of a small foundation pit according to the designed slope, and a plain concrete cushion layer is poured; 3, a structural bottom plate and a side wall of the rail traffic interval are poured sequentially, the two sides of a rail cross section structure are backfilled, and a fast road frame bottom plate is poured; 4, a fourth support is disassembled, the side wall of a tunnel frame is poured upwards, and the supports are replaced; 5, a third support is disassembled, and the fast road tunnel frame top plate is poured; 6, a second support and a first support are removed in sequence, and then the supports are disassembled; and 7, lattice columnsare cut off, an additional waterproof layer is applied to the tunnel frame top plate, soil covering and backfilling are carried out, and the road surface of the urban main road is restored. The invention provides an effective solution method for building the underground fast road tunnel and the rail traffic interval in silt soft soil.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to a construction method for joint construction of an underground expressway and a rail transit section under an urban main road. Background technique [0002] Many areas in coastal cities belong to soft soil strata. With the modernization of the city, it is not suitable to build elevated expressways on the upper part of the main urban roads in the existing high-end business districts and high-end residential areas, so underground expressways have to be built. In this way, when the strength of the soil layer at the lower part of the main road in the city is relatively good, the process of the underground expressway and the rail transit section is generally to construct the enclosure structure first, excavate the foundation pit, and then pour the rail transit section structure and the underground rail transit section structure from bottom to top. Expressway tunnel ...

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the existing problems in the joint construction of underground expressway tunnels and subway shield sections in silty soft soil

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