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Construction method for allowing shield to pass through operated subway tunnel in short distance under complex working conditions

A technology for complex working conditions and tunnel construction, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of ground subsidence, soil loss, displacement, and differential settlement of subway line 2 tunnels, and achieve control of settlement and good Uniformity and permeability, effect of reducing impact

Active Publication Date: 2012-01-11
SHANGHAI FOUND ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the shield is about to enter the hole and the stress is released, the confining pressure required for synchronous grouting construction cannot be guaranteed, and the deformation of the soil is difficult to control
If there is water gushing or sand gushing when the shield enters the tunnel, it will cause ground subsidence and soil loss, which will cause differential settlement and displacement of the subway line 2 tunnel, which will have an adverse impact on the subway line 2 tunnel. In severe cases, it may even endanger the operation safety of Metro Line 2

Method used

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  • Construction method for allowing shield to pass through operated subway tunnel in short distance under complex working conditions
  • Construction method for allowing shield to pass through operated subway tunnel in short distance under complex working conditions
  • Construction method for allowing shield to pass through operated subway tunnel in short distance under complex working conditions

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Effect test

Embodiment 1

[0068] 1. Project overview:

[0069]Shortly after the section tunnel of Metro Line 1 is crossed, the shield machine exits from the working shaft of Changshu Road Station, and the tunnels of the uplink and downlink lines will pass under the section tunnel of Metro Line 1. The tunnel that has been built in this section is the tunnel between Hengshan Road and Changshu Road of Metro Line 1. It was started in 1992 and completed in 1993. It was constructed by Shanghai Basic Engineering Company and is currently in operation. The soil layer of the subway line 1 tunnel to be crossed is mainly silty clay and gray clay layer, the outer diameter of the tunnel is φ6200mm, the lowest elevation of the tunnel center is -9.725m, and the highest elevation is about -9.295m. The thickness of the covering soil at the upper part of the tunnel is 9.99m~10.3m. The overlapping projected length of the uplink tunnel between Changshu Road Station-Zhaojiabang Station and Metro Line 1 Hengshan Road-Changs...

Embodiment 2

[0213] 1. Project overview

[0214] The tunnel for the upper and lower lines of the section tunnel between Hunan Road Station and Baiyang Road Station will pass through the tunnel of the subway line 2 section. The shield will cross the tunnel of the subway line 2 at an angle of 40° after 255m from the tunnel at the west end of Baiyang Road Station. The minimum distance between shield tunnels is only 1.24m, which makes it very difficult for shield tunneling to advance in the tunnel.

[0215] 1. The project scope and mileage of the shield tunnel in the region passing through Metro Line 2 in this section are detailed in the table below.

[0216]

[0217] The minimum curve radius of the interval tunnel plane is R=349.851m, the minimum radius of the vertical curve is R=2000m, the maximum longitudinal slope of the tunnel is 29.06‰, the lowest elevation of the tunnel center is -18.680m, and the highest elevation is about -6.920m. The thickness of the covering soil on the upper pa...

Embodiment 3

[0363] 3. Project overview

[0364]The section of the subway line 2 interval tunnel is crossed. After the shield machine exits the tunnel at the north end of Yuyuan Station, the uplink and downlink tunnels will successively pass through the section below the subway line 2 interval tunnel. This section is Nanjing East Road Station of Metro Line 2~ The tunnel between Lujiazui Station is currently in operation. The soil layer where the subway line 2 tunnel is located is mainly gray silty clay layer, the outer diameter of the tunnel is φ6200mm, the elevation of the tunnel structure bottom is -12.856m, and the thickness of the upper part of the tunnel is about 9.3m. The projection length of the section 6 of Shanghai Rail Transit Line 10 Project Yuyuan Station-Nanjing East Station overlapped with the uplink tunnel of Metro Line 2 is about 22.8 meters (SK19+508.800~SK19+531.600), and the overlapped downlink tunnel The projection length is about 23.6 meters (XK19+507.200~XK19+531.300...

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Abstract

The invention relates to a construction method for allowing a shield to pass through an operated subway tunnel in a short distance under complex working conditions. The method comprises the following steps of: 1) analyzing a passing working condition mathematical model; 2) setting construction parameters; 3) establishing real-time monitoring in the passing period of the shield and monitoring of the tunnel and the surrounding environment; and 4) performing shield construction, namely performing construction parameter control, synchronous grouting and double-liquid grouting. By the method, the shield can successfully pass through the operated subway tunnel, and safe operation of a subway train is ensured.

Description

technical field [0001] The invention relates to a construction method for a subway tunnel, in particular to a construction method for a shield machine passing through an operating subway tunnel at a short distance. Background technique [0002] Shanghai Metro Line 10, Line 10, Line 7, Line 8, and Line 7, Line 25, need to pass through the subway tunnels in operation at close range, which has the following difficulties: [0003] 1. Pass through the subway tunnels that have been built and are in operation at a super short distance [0004] 7.8 The tunnels of the uplink and downlink lines between Changshu Road Station and Zhaojiabang Station pass under the section tunnel of Metro Line 1 in operation, and the minimum distance between the two tunnels is only 1.5m. [0005] 7.25 The tunnels of the uplink and downlink lines between Baiyang Road Station and South Hunan Road Station pass through the section tunnel of Metro Line 2 in operation, and the minimum distance between the two...

Claims

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Application Information

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IPC IPC(8): E21D9/093E21D11/10E21D9/08
Inventor 郑坚陈静刘刚陆正
Owner SHANGHAI FOUND ENG GRP
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