Active control grouting lifting method for subway station close-fitting and under-penetrating existing station

Abstract

The invention discloses an active control grouting lifting method for a subway station to be closely attached to an existing station, including construction preparation, grouting hole arrangement, grouting stop wall setting, grouting lifting and grouting effect inspection. According to the actual site data, the position of the pilot hole, the relative position of the existing station and the new station, the position of the deformation joint of the existing station, and the main impact area of ​​the close-fitting underpass construction on the existing station, the grouting lifting plan is prepared, and then the Deep hole grouting forms a grouting wall. After the grouting wall is formed, sleeve valve pipe grouting is used to raise the existing station. After the excavation of the pilot hole is completed, the grouting effect shall be checked, and repeated grouting shall be carried out for individual parts with large settlement values. Ensure that the settlement is controlled within a controllable range. This method can actively control the settlement and deformation of the existing station when the new station is closely attached to the existing station by the hole pile method, so that the construction of the underpass can be completed under the normal operation conditions of the existing station, ensuring that the existing station and the densely attached under the existing station are completed. Wear construction safety.

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 subway stations that are closely attached and penetrated through existing stations, in particular to an actively controlled grouting lifting method of tunnel pile method construction of subway stations that are closely attached and penetrated through existing stations. 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 works, which has gradually increased the number of projects that cross existing lines. For the current domestic and foreign closely attached and underpassed projects, mainly new tunnels are closely attached to underpass existing tunnels or existing station projects, and newly built stations are closely attached...

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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