Construction method for shield tunneling machine retaining structure taking position firstly and being constructed secondly and for shield shaft excavation

Abstract

The invention discloses a construction method for a shield tunneling machine retaining structure taking a position firstly and being constructed secondly and for shield shaft excavation. The construction method comprises the following steps that step one, a shield tunneling machine takes the position in an arranged position of the retaining structure, and a tunnel face is sealed; step two, the retaining structure is constructed, and a plurality of shielding short piles are arranged; step three, outward radial grouting reinforcement is carried out on duct piece semi-ring soil mass on the position of a duct piece; step four, a temporary support is additionally arranged in a ring duct piece on the tail portion of a tunnel shield; step five, a shield shaft foundation pit is excavated in the retaining structure to a standard section pit bottom, and in the process of foundation pit excavation, soil mass inclined deep hole grouting reinforcement is carried out on the external of an upper ring on the tunnel duct piece outside each shielding short pile in the foundation pit, and anchor cables are arranged outwards on the inner side wall of the retaining structure. The construction method for the shield tunneling machine retaining structure taking the position firstly and being constructed secondly and for the shield shaft excavation can flexibly arrange a station construction period, and a shield section construction period is not limited by station structure construction.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a construction method for constructing an enclosure structure and excavating a shield well after a shield tunneling machine is in place first. Background technique [0002] In the construction of subway projects, the shield tunneling method has been more and more widely used. In the relevant design, the origin and arrival of the shield machine are the key links. In order to meet the starting and hoisting of the shield machine, it is necessary to install a shield working well at the end of the shield section. In the conventional design, the shield well is set in conjunction with the station, and the shield well is placed at the end of the station. After completing the main structure of the shield well and cutting out the enclosure structure of the portal, the shield machine entered the station and was hoisted out. [0003] However, in actual construction, the constructi...

AI Technical Summary

Problems solved by technology

If the shield machine cannot enter the shield working shaft of the station in time, the follow-up equipment cannot be dismantled in time. At the same time, conditions such as subsequent excavation and transportation of segments need to be reserved, thus affecting the normal construction of the section and the shield starting station

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