A Method of Reverse Construction of Subway Stations under Operating Conditions

Abstract

The invention discloses a subway station expanding method by using a reverse method under an operating condition, and relates to the technical field of underground space development. The subway station expanding method solves the problems of complex construction process, long construction period and the high construction cost of connecting of a new subway station and an old subway station and existed in a method for improving the carrying capacity by newly building subway routes. The subway station expanding method comprises the steps that 1, original well and receiving well construction is conducted; 2, pipe-shed construction and grouting reinforcement are conducted; 3, a first underground layer soil body is excavated, temporary support is arranged, steel pipe pile construction is conducted to build a vertical enclosure structure of a second underground layer, steel pipe piles are lengthened to make the tops of the steel pipe piles be connected with the top of a first underground layer, and first underground layer bottom plates are casted, and a soil taking opening is reserved; 4, a second underground layer soil body is excavated till the tunnel center height, an upper layer segment is removed, but bottom standard blocks are reserved; and excavating is continued to the bottom plate position of the second underground layer, and the bottom standard blocks are removed, cast-in-situ of bottom plates of second underground layer is conducted, prefabricated concrete bottom plates with tracks are laid, and the structure is connected with the existing station after being finished.

Description

technical field The invention relates to the technical field of underground space development, in particular to a reverse construction and expansion method of a subway station under operating conditions. Background technique With the increasing population of central cities, the ground transportation has been far from meeting the travel requirements of the majority of residents, and the development of underground transportation is imperative. At present, in China, new subway lines and new subway stations are mainly used to improve underground transport capacity. This method has the following disadvantages when applied to central urban areas: 1) The cost of new subway lines is high, and the construction of central urban areas needs to consider the surrounding demolition and pipeline displacement. Complex situation, high cost, and long construction period; 2) The construction process for the connection between the new subway line and the existing subway station is complicated, ...

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