Construction Method of Shield Tunneling Milling Ground Connecting Wall Underpassing Subway Stations

Abstract

The invention discloses a construction method for shield excavation and grinding of a ground connection wall to pass under an operating subway station, comprising the following construction steps: a. treatment of the ground connection wall; b. survey; c. backfilling treatment; d. shield tunneling. The present invention adopts the underground excavation method for construction, and adopts the upper and lower steps method for excavation, and only excavates the upper steps, and performs local pretreatment on the ground connection wall of the intruded underground excavation tunnel, mainly for the I-beam joint of the ground connection wall. Removal, cutting off half of the steel bars on the ground connection wall in the range of the intruded underground excavation tunnel, and then backfilling the underground excavation tunnel on the upper step with C20 concrete, and then tunneling through the wall with the shield machine, effectively reducing the construction of underground excavation and the removal of the ground connection wall It reduces or avoids the impact of shield tunneling tunneling on the operation of the subway station, ensures the safety of the operation of the subway station, and at the same time shortens the construction period and saves construction costs.

Description

technical field [0001] The invention belongs to the technical field of construction of an operating subway station, and in particular relates to a construction method for shield tunneling and ground grinding and connecting walls to pass under an operating subway station. Background technique [0002] With the rapid development of my country's urban rail transit construction, multiple subway lines cross each other to form a subway network line, which greatly improves the travel efficiency of passengers. However, in the process of connecting the subway lines into a network, it is inevitable that the subway tunnels of the new lines will pass through the existing subway stations. In Beijing, Guangzhou, Shanghai, Nanjing, Suzhou and other domestic cities, as well as in London, New York, Foreign cities such as San Francisco have similar engineering examples. When the new subway tunnel passes through the existing operating subway station, it needs to pass through the underground d...

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Problems solved by technology

[0003] In the prior art, there are generally two common construction methods for newly-built subway tunnels passing through existing operating subway stations: 1. Excavating the underground tunnel by adopting the underground tunnel method, breaking the connecting wall of the intruding underground tunnel, and then constructing The guide platform and the shield tunnel are pushed through empty. This construction method is a large-section underground excavation tunnel passing under the existing subway station in operation. The risk of underground excavation is high, and the ground connection wall at the joint between the underground excavation tunnel and the shield tunnel has a high risk of water penetration and collapse. , and the entire underground excavation period is long, and the project cost is high; 2. Adopt the method of excavating the shaft close to the ground and connecting the wall to remove the ground connecting wall of the intruded underground excavation tunnel, and then use low-grade plain concrete to backfill the shaft within the scope of the underground excavation tunnel, and the rest Part of the vertical shaft is backfilled with muck, and then excavated by the shield machine. This construction method is vertical shaft excavation, which will be limited by ground conditions. The overall construction period is long, and the project cost is high. In addition, new construction land increases the occupation of land resources. , destroying the surface landscape and underground soil structure

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