Subway station active control grouting lifting method for close-fitting underpass of existing station

Abstract

The invention discloses a subway station active control grouting lifting method for close-fitting underpass of an existing station. The subway station active control grouting lifting method comprises the steps of construction preparation, grouting hole arrangement, grout stop wall arrangement, grouting lifting and grouting effect inspection. Firstly, according to actual field data, the position of a pilot tunnel, the relative position of the existing station and a newly-built station, the position of a deformation joint of the existing station and a main influence area of close-fitting underpass construction on the existing station, a grouting lifting scheme is compiled; and then deep hole grouting is adopted to form a grout stopping wall, after the grout stopping wall is formed, sleeve valve pipe grouting is adopted for grouting to lift the existing station, the grouting effect is checked after pilot tunnel excavation is completed, repeated grouting is carried out on individual parts with the large settlement value, and it is guaranteed that settlement is controlled within the controllable range. According to the subway station active control grouting lifting method for close-fitting underpass of the existing station, settlement deformation of the existing station can be actively controlled during close-fitting underpass of the existing station of the newly-built station in the hole pile method construction, so that the underneath pass section construction is completed under the normal operation condition of the existing station, and the safety of the existing station and close-fitting underpass construction is ensured.

Description

technical field [0001] The invention belongs to the technical field of underground structure construction, and relates to an active control grouting lifting method for a subway station to pass under an existing station, and in particular to an active control grouting lifting method for a subway station to pass under an existing station in the construction of a tunnel pile method. Background technique [0002] In recent years, rail transit has begun to develop three-dimensionally, and the concept of underground three-dimensional intercommunication has been established in the design concept of tunnels and underground projects, which has gradually increased the number of projects that pass through existing lines. For the current close-fitting underpass projects at home and abroad, there are mainly new tunnels closely pasted under existing tunnels or existing station projects and new stations closely pasted under existing tunnel projects, and new stations are closely pasted under...

AI Technical Summary

Problems solved by technology

However, even though the hole pile method is used for construction, the settlement value of the existing station may still exceed the control value during the construction process. At this time, the construction will face huge risks and have a serious impact on the existing station

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