A two-way split starting method for small shields in narrow shafts

Abstract

The invention discloses a two-way split initiation method for a small shield in a narrow shaft, which mainly includes seven major steps for implementation. By rationally arranging the sequence of trolleys going down the well, the split pipeline is the shortest, and at the same time, mid-setting Following problems such as pumping station or inability to return oil, improve construction efficiency, the method is concise and reasonable, the process division is clear, there is no complicated redundant process, the schedule requirements for shield starting are guaranteed, mutual interference in the starting process is avoided, and the space utilization rate is high. It can effectively reduce the size of the two-way starting shaft, and at the same time reduce the shield supporting equipment and personnel investment, save the split starting pipeline, and effectively reduce the construction difficulty and cost.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction by shield tunneling method, and in particular relates to a two-way split starting method for small shield tunnels in narrow shafts. Background technique [0002] As a safe, fast and reliable tunnel construction method, the shield method has been widely used in tunnel construction in various fields. Shield method construction mainly includes three links, origination, excavation and reception. During the normal shield tunneling construction, the size of the starting shaft should be larger than the length of the shield machine and the supporting equipment, and the shield machine and the supporting equipment will be hoisted and lowered by the crane for debugging and connection, and then the overall initial excavation will be carried out. However, during the construction of the sewage transmission system project in the core area of ​​Dadong Lake, due to the small section of the tunnel, the...

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