Supporting structure for six-pilot-holes large-section metro station undercrossing existing line

Abstract

Provided is a supporting structure for a six-pilot-holes large-section metro station undercrossing existing line. The invention relates to the field of tunnel and underground engineering construction; two operation wells are symmetrically arranged at the right side and the left side of the existing line, and an advanced reinforcement soil is arranged between the two operation wells and at the lower portion of the existing line, two layers of guiding holes are arranged in the advanced reinforcement soil, the upper guiding holes from left to right are a fourth guiding hole, a third guiding hole, a second guiding hole, a first guiding hole; a fifth guiding hole and a sixth guiding hole are arranged under the third guiding hole and the second guiding hole respectively; beams at pile top are arranged in the first guiding hole and the fourth guiding hole, a lifting jack temporary support mechanism is arranged at a stair part of the upper portion of the beams at the pile top, a lifting jack is arranged at the upper portion of the lifting jack temporary support mechanism, a steel plate is arranged at the upper portion of the lifting jack. The supporting structure can not only control the settlement of the existing line remarkably, which ensures safety operation of the existing line, but also can achieve communication between metro station hall and platform floor, which remarkably improves overall use function and the riding experience of the station.

Description

Technical field [0001] The invention relates to the field of tunnel and underground engineering construction, in particular to a supporting structure for a six-guide tunnel large-section subway station underneath an existing line. Background technique [0002] my country is in a period of large-scale underground space development with large-scale urban subway construction as the main body. More and more intersections of subway lines need to cross existing lines. Undercutting underneath the existing line is one of the most difficult and risky key projects in the subway construction process. The traditional underground excavation method of underground excavation under the existing line often adopts the multi-guide tunnel CRD method, the double-side tunnel method, the PBA method and the hole column method, etc. The arches generally adopt the arc roof form, and the new line and the existing line Interlayer soil is left between the lines to facilitate grouting and reinforcement. Th...

AI Technical Summary

Problems solved by technology

In order to reduce the risk of excavation, the traditional concept of underground excavation under the existing line is generally in the form of a double-hole single-layer with a small cross-section. Poor, the passenger experience is poor, and there are many changes in the excavation process, the deformation and settlement of the existing line is too large, and the space utilization rate is low.

In addition, some underground excavation stations constructed by the hole pile method pass through the existing lines. Due to the large force on the center column of the station and the large diameter of the pile foundation, in some places where the ground strength is high, the construction of large-diameter pile foundations in the pilot tunnel is more efficient. Low, long construction period, needs to be improved urgently

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