Construction method of overlapped shield tunnel

Abstract

The invention discloses a construction method of an overlapped shield tunnel. The construction method of the overlapped shield tunnel comprises the following steps that a downlink shield tunnel is tunneled, and a tunnel structure adopts a reinforced pipe piece; a soil body clamped between an uplink tunnel and the downlink tunnel is grouted through grouting pipes in secondary grouting holes of the downlink tunnel; a trolley supporting system is arranged inside the downlink tunnel to protect the downlink tunnel before the uplink tunnel is constructed; the uplink tunnel is tunneled, and downlink tunnel supporting trolleys keep synchronous advancing with the tunneling of the uplink tunnel in the construction process; the soil body clamped between the uplink tunnel and the downlink tunnel is grouted through the grouting pipes in secondary grouting holes of the downlink tunnel. The construction method of the overlapped shield tunnel is suitable for the overlapped shield tunnel in the city underground engineering construction, can guarantee safe construction of the overlapped shield tunnel, and enables control measures to be operable, the construction is convenient and rapid, influences of construction on the structure of the overlapped shield tunnel are reduced, influences on the ambient environment are few, and environmental safety risks can be reduced.

Description

technical field [0001] The invention belongs to the technical field of underground construction engineering, in particular, the invention relates to a construction method of a stacked shield tunnel. Background technique [0002] With the acceleration of my country's urbanization process and the expansion of city scale, problems such as urban land shortage, crowded living space, and traffic congestion have seriously affected people's quality of life and hindered the normal and sustainable development of cities. It is the most effective way to solve urban traffic problems. One of the means of subway construction will also be developed rapidly. In major cities across the country led by Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing, etc., various underground projects, especially subway projects, have entered the stage of large-scale construction. [0003] With the development of subway construction, two problems will have to be faced in the process of subway construction: on t...

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Problems solved by technology

[0003] With the development of subway construction, two problems will have to be faced in the process of subway construction: on the one hand, due to the limitation of underground space and the need for transfers, the phenomenon of crossing between subway lines gradually increases, and short-distance crossing The section or station engineering of the existing line will inevitably have an impact on the existing underground structure, which will bring many difficulties to the construction; on the other hand, with the high utilization of land, the corridors of the subway line are very limited, especially in the bustling urban areas. Often the residents are dense, the passenger flow is concentrated, the business is busy, there are many high-rise buildings, and the underground pipelines are criss-crossed. The subway construction in the city is affected by various factors such as underground municipal pipelines, ground buildings, ground transportation, and existing underground projects. The (structure) buildings are densely covered, and the underground environment is complex and changeable, but this kind of area is precisely the place where the subway is most needed

[0004] For the second case, due to the limitation of underground space, it may not be possible to adopt the conventional parallel arrangement of two-hole tunnels in the subway interval tunnels, and it is necessary to stack the two-hole tunnels of the subway line to accommodate the narrow underground building space

The cascading tunnel not only has a small width of underground space corridors and a small impact on the ground, but also greatly reduces the number of times of passing through existing urban facilities. However, the new layout of subway tunnels also brings a series of technical difficulties to the design and construction

At present, there are few overlapping tunnel projects built in the same period, and there are not many research results in this area, and there are limited reference materials

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