A construction method for a large-section subway crossing tunnel

Abstract

The invention discloses a construction method for a large-section subway single connecting tunnel, and belongs to the technical field of tunnel construction. The construction method comprises the steps of constructing a fender post and a water-stopping curtain of a silo, digging the silo and constructing a crown beam at the silo mouth, and constructing a ring beam on the inner wall of the silo; constructing a horsehead at the lower end, facing the inside direction, of the inner wall of the silo, and digging a cross channel from the horsehead along the direction perpendicular to the panel of the horsehead to the end wall; constructing a concrete backfill layer at the bottom of the silo; constructing a supporting structure of a main hole of the channel corresponding to the silo and the crosschannel, and backfilling the concrete backfill layer to the earth surface. According to the construction method provided by the invention, the silo and the cross channel are simultaneously used as the working space for the construction of the main hole of the channel, the ground occupied area and underground earthwork excavated volume are reduced, and the influence to the surrounding road transport and buildings is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for a large-section subway crossing tunnel. Background technique [0002] With the continuous advancement of my country's urban modernization process, in order to expand traffic resources, more and more cities are building subways to ease urban traffic pressure. However, the urban environment has the characteristics of complex environment, dense buildings, dense pipelines, etc., and most subway sections pass through shallow buried strata, and the rock strata are often rich in water and severely weathered, which brings great risks to subway construction. [0003] In order to reduce the construction risk, shield tunneling is adopted for most subway sections, but for special-shaped structures with large cross-sections such as subway stop lines, turnback lines, and crossing lines, the mining method has to be used for construction, but it further incr...

AI Technical Summary

Problems solved by technology

However, the urban environment has the characteristics of complex environment, dense buildings, dense pipelines, etc., and most subway sections pass through shallow buried strata, and the rock strata are often rich in water and severely weathered, which brings great risks to subway construction.

[0003] In order to reduce the construction risk, shield tunneling is adopted for most subway sections, but for special-shaped structures with large cross-sections such as subway stop lines, turnback lines, and crossing lines, the mining method has to be used for construction, but it further increases the Due to the risk of construction, and considering the characteristics of the urban environment, the vertical shaft is generally used to assist the excavation of the main tunnel

[0004] There are two forms of conventional shaft-assisted tunnel excavation: one is to construct tunnel tunnels within the range of the shaft, such as figure 1 As shown, the first shaft 1 is excavated and supported first, and the first tunnel main hole 2 is excavated at the side wall of the first shaft; the defect of this method is that a shaft with a large section needs to be built during the tunnel construction Or foundation pit, the excavation volume of earthwork is large, the support is difficult, and it is easy to affect the surrounding environment

The second is to construct the second tunnel main hole 4 within the scope of the first cross passage 3, such as figure 2 As shown, the second vertical shaft 5 is excavated first to complete the support, and the first horizontal channel 3 is excavated and supported at the side wall of the second vertical shaft 5. On the basis of the working space provided by the first horizontal channel 3, the second horizontal channel is excavated. 2. Tunnel main hole 4; the disadvantages of this method are: it needs to build a long horizontal passage, there are requirements for the location of the vertical shaft, and the amount of earthwork excavation is relatively large

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