Novel semi-wrapped full-drainage waterproof subway station and construction method

Abstract

The invention relates to a novel semi-wrapped full-drainage waterproof subway station and a construction method. According to the subway station, on the basis of fully utilizing the bearing capacity of surrounding rock, a traditional composite lining of an arch wall is adjusted into a structural form of an anchor rod supporting layer, a sprayed waterproof film layer and a double-layer concrete spraying layer, only a beam, plate and column bearing system with simple force transmission is arranged in the subway station, the lining thickness can be reduced, the material cost can be saved, the construction organization can be simplified, the construction speed can be increased, waterproof weak joints such as traditional secondary lining construction joints and deformation joints can be omitted, and flood treatment and rectification are not needed in the operation period; and meanwhile, the subway station is provided with a semi-wrapped full-drainage waterproof system composed of capillary drainage plate strips, the sprayed waterproof film layer, longitudinal drainage blind pipes, drainage side ditches, a plurality of transverse drainage pipes, a plurality of drainage longitudinal pipes and drainage transverse pipes, so that the lining of the subway station can be prevented from being threatened by underground water pressure, and the waterproof effect and the drainage capacity of the subway station can be improved in an all-around mode.

Description

technical field [0001] The invention relates to the field of subway engineering design and construction, in particular to a new semi-enclosed and fully drainage and waterproof subway station and a construction method. Background technique [0002] At present, the urban subway engineering structure is mostly based on "composite lining", including primary support, waterproof board and secondary lining. The primary support is a temporary structure without durability requirements, and its role is only to maintain the tunnel structure during construction. stability, while the water and soil pressure during the operation period are all permanently borne by the cast-in-place secondary lining with better durability. The waterproof board is used to block groundwater from entering behind the secondary lining. Usually, the secondary lining is designed to have a large thickness and high steel content to resist the external water pressure head load; on the other hand, various constructio...

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Problems solved by technology

[0002] At present, the urban subway engineering structure is mostly based on "composite lining", including primary support, waterproof board and secondary lining. The primary support is a temporary structure without durability requirements, and its role is only to maintain the tunnel structure during construction. stability, while the water and soil pressure during the operation period are all permanently borne by the cast-in-place secondary lining with better durability. The waterproof board is used to block groundwater from entering behind the secondary lining. Usually, the secondary lining is designed to have a large thickness and high steel content to resist the external water pressure head load; on the other hand, various construction joints formed during the secondary lining mold construction Deformation joints have become key waterproof weak points in the later period. During the operation of the subway, the phenomenon of "ten prevention and nine leakages" is common.

[0003] Since the subway tunnel is surrounded by geological surrounding rock, which is both a supporting structure and a source of load, when the engineering surrounding rock has high strength, good integrity, and poor groundwater, especially hard rock in Qingdao, Dalian, Chongqing and other areas The subway project built in the strata is a typical representative, but the traditional composite lining still has many disadvantages such as waste of engineering materials, complicated construction organization, and reduced degree of mechanized operation. The cost of engineering support is generally high and the construction period is generally long; for For this kind of hard rock formation, the design of the underground structure should be considered as a "combination of eternal and temporary", and the construction concept of "New Austrian Method" should be always implemented, that is, to give full play to and utilize the self-bearing capacity of the surrounding rock, and appropriately weaken the support formed by artificial materials. At the same time, a reasonable groundwater drainage system is set up to alleviate or even eliminate the threat of external water pressure to the secondary lining

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