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A settlement control method for subway tunnels passing through existing operating lines

A technology for settlement control and tunneling, which is applied in tunnels, tunnel linings, underground chambers, etc., and can solve problems such as large shield sections, inability to keep them, and affecting the safety of subway operations, so as to improve stability and strength, prevent settlement, and reduce overburden. side risk effect

Active Publication Date: 2022-08-05
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In subway construction, when the subway tunnel under construction needs to pass through the tunnel of the existing operating line, if the geological data reveals that the full section of the shield excavation is a "soft upper and hard lower" stratum, there will be "impossible push" at the bottom during construction at this layer. If no measures are taken, the construction of the shield tunnel will cause settlement of the existing operation line tunnels that have been completed and operated. If the settlement deformation value exceeds the specification requirements It will affect the operation safety of this section of the subway.
There is no technical solution for this construction problem in the prior art

Method used

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  • A settlement control method for subway tunnels passing through existing operating lines
  • A settlement control method for subway tunnels passing through existing operating lines
  • A settlement control method for subway tunnels passing through existing operating lines

Examples

Experimental program
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Embodiment Construction

[0038] Overview of the pilot construction project

[0039] 1.1 Background of the experimental construction project

[0040] A city's rail transit line 22 A station in the middle of the air shaft ~ A station 2# shield shaft section (the section length is 2.513KM), at the intersection of B and C roads, the existing subway line 3 (station D-E Station), the clear distance between the top of the tunnel of Line 22 and the bottom of the existing line of Line 3 is about 5.5m, the buried depth of the top of the left line of Line 22 is 26.5m, and the depth of the top of the existing line of Line 3 is 15.1m. When the shield passes, first go down the right line of Line 3, and then go down the left line.

[0041] Line 3 is located in the stratum 5Z-2 and 6Z-2. It is a shield tunneling tunnel with an outer diameter of 6 meters. The excavation diameter of the shield machine cutter head of Line 22 is 8.840 meters, and the outer diameter of the segment is 8.5 meters.

[0042] 1.2 Overview of...

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Abstract

The invention discloses a settlement control method for a subway tunnel passing through an existing operating line, comprising the following steps: (A) drilling a horizontal section hole directly below the existing operating line tunnel and directly above the subway tunnel under construction, and the The direction of the drilling holes in the horizontal section is along the direction of the subway tunnel under construction; (B) the grouting valve pipe is installed in the drilling hole in the horizontal section; (C) the grouting valve pipe and the horizontal section are drilled with filling materials Fill the annular space between the hole walls; (D) grouting the formation around the grouting valve pipe. The horizontal hole grouting pre-reinforcement technology is used to pre-reinforce the overlapping areas of the existing operating line tunnels and the subway tunnels under construction. The fully weathered and strongly weathered composite granite is consolidated by grouting to improve the overall stability and strength of the rock mass and reduce shielding. It can effectively prevent the subsidence of the existing operating lines and tunnels.

Description

technical field [0001] The invention relates to the technical field of subway construction. Specifically, it is a settlement control method for subway tunnels to penetrate existing operating lines. Background technique [0002] In subway construction, when the subway tunnel under construction needs to pass through the existing operating line tunnel, if the geological data reveals that the full section of the shield excavation is a "soft upper and lower hard" stratum, there will be "unable to push" stratum below during construction at this stratum. If no measures are taken, the existing operating line tunnels that have been built and operated will cause settlement of the existing operating line tunnels. If the settlement deformation value exceeds the specification requirements It will affect the operational safety of this section of the subway. There is no technical solution for this construction problem in the prior art SUMMARY OF THE INVENTION [0003] Therefore, the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/10E21D11/10E21F15/00E21B33/13E02D3/12C04B26/26C04B28/00
CPCE21D9/10E21D11/105E21F15/005E21B33/13E02D3/12C04B26/26C04B28/00E02D2250/003C04B14/104C04B24/383C04B22/10C04B14/368C04B14/10C04B12/04C04B18/146
Inventor 陈振国梁敏李生生刘书杰贺文陈龙杨明袁东锋冯旭海杨雪陈君王桦田乐
Owner BEIJING CHINA COAL MINE ENG CO LTD
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