The construction method of the station guide tunnel and underground excavation of the existing operating station under zero distance

Abstract

The invention discloses a station guide tunnel and underground digging station construction method that passes through the existing operating station at zero distance, solves the problems of slow construction speed and high safety risk in the prior art, improves the efficiency of guide tunnel construction, and shortens the construction time of newly built stations The beneficial effect of avoiding the excessive settlement and deformation of the structure of the existing operation station is to avoid the beneficial effect of the construction period. The specific plan is as follows: the construction method of the station guide tunnel passing through the existing operation station at zero distance, including the use of pipe jacking machines to carry out the operation of the guide tunnel. It includes the following contents: use the underground excavation of the cross passage as the pipe jacking work shaft; after the hole is cut out, the pipe jacking machine jacking operation is carried out in the cross passage; while the pipe jacking machine is jacking, the pipe joints and segments are assembled Form the secondary lining structure of the pilot hole.

Description

Technical field [0001] The present invention relates to the field of rail transit, in particular zero distance under the station guide hole through the existing operating station, the construction method of the hidden excavation station. Background [0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art. [0003] At present, new stations are excavated under the existing operating stations, in order to ensure safety, it is usually necessary to close the existing operating stations, and the newly built stations have zero distances down to penetrate the existing operating stations. The technical characteristics of the flat-topped straight wall section guide hole itself determines that its force form is poor, and there are problems of multi-type stress concentration of local nodes in the initial branch and the second lining, which is not conducive to the formation of soil arc...

AI Technical Summary

Problems solved by technology

The technical characteristics of the pilot tunnel with flat roof and straight wall section determine its stress form is poor. Both the primary support and the secondary lining have the problem of multi-type stress concentration at local nodes, which is not conducive to the formation of soil arches during the excavation period, and the soil structure itself poor stability

[0004] And further, the inventor also found that the flat-top straight section usually adopts the method of manual excavation, so that the existing operating stations also need to be closed, and the manual excavation takes a long time, which makes the existing operating stations closed for a long time, which affects the station. operation and benefits; and above the new station is the existing operating station, the speed of manual excavation is slow and the construction period is long, which makes the settlement control of the existing operating station weak

In addition, during the process of removing the primary lining and the construction of the secondary lining, the structural force transfer is relatively more complicated than that of the arched tunnel, and engineering accidents such as excessive settlement or even collapse are more likely to occur, which is not conducive to the settlement of existing operating stations and new stations. Control and Risk Management

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