Double-split starting method of small-clearance double-line tunnel shield

Abstract

The invention discloses a double-split starting method of a small-clearance double-line tunnel shield. The method comprises the following steps that arranging a starting station main body structure, backfilling and reinforcing a starting end, installing a temporary seal of a tunnel door, installing a starting frame, assembling and debugging a shield, installing a reaction frame, installing a negative ring segment, and performing starting trial tunneling of the shield. According to the method, the reasonable space layout is carried out on a starting station structure well, temporary reverse hidden excavation pilot tunnel is constructed to assist split starting, the shield starting frame, the reaction frame and the negative ring segment are sequentially installed, the split starting construction of the double-line small-clearance tunnel shield under the condition that the whole starting is difficult due to the insufficient space of a site is realized, and engineering practice verifies that the split starting method has the advantages of small construction cross influence, small influence on the surrounding environment, reduction of construction period pressure, safety, reliability and the like, and can be applicable to projects with insufficient length of the end well of the subway shield starting vehicle station.

Description

technical field [0001] The invention belongs to the field of tunnel start-up engineering, and in particular relates to a double-split start-up method of a small-clear-distance double-line tunnel shield. Background technique [0002] With the rapid development of urban rail transit, shield construction has gradually become the main method for constructing underground tunnels. According to the conventional shield construction process requirements, it is necessary to set up the shield tunnel at the end of the station, and the construction scope of the main structure of the station should have the conditions for placing the shield machine head, the length space of the supporting equipment and the setting of slag holes. Complete the corresponding starting work in the starting well of the head. [0003] To meet the above conditions, the construction of the main body of the station needs to occupy a large amount of construction site to meet the construction needs. The conventional...

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Problems solved by technology

In the complex surrounding environment of the city, affected by the demolition and land occupation of ground buildings (structures), the relocation of underground municipal pipelines, and the transformation of ground traffic guidance, it is difficult to construct a starting station with a suitable length

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