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Two lines intersection small radius, shallow earth covering and large longitudinal slope complicated linetype shield construction method

A construction method and technology of shallow covering soil, which can be used in earth drilling, infrastructure engineering, artificial islands, etc., and can solve the problems of power vehicles self-propelled, shield tunnels slipping out of the platform, etc.

Active Publication Date: 2011-05-11
CHINA RAILWAY NO 2 ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of shield tunneling construction in large longitudinal slope sections, dangers such as the power vehicle detaching from the vehicle and the shield slipping out of the platform are prone to occur.
From the existing engineering examples, there are two-line interchange excavation, small-radius curve excavation, large longitudinal slope excavation, shallow overburden excavation and other single-line and simple overpass shield tunneling construction methods, and there is no such method as two-line interchange small Literature reports on shield tunneling methods in the case of radius, shallow overburden, and complex line shape of large longitudinal slope

Method used

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  • Two lines intersection small radius, shallow earth covering and large longitudinal slope complicated linetype shield construction method
  • Two lines intersection small radius, shallow earth covering and large longitudinal slope complicated linetype shield construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0086] Using two-dimensional numerical simulation, two working conditions are simulated according to the different tunnel advancement sequences, namely "construct the upper tunnel first, then the lower tunnel" (condition 1) and "construct the lower tunnel first, then the upper tunnel" (condition 1). 2) In two sequences, calculate and analyze the displacement of the first tunnel and the change of the internal force of the structure caused by the shield construction of the later tunnel under the two working conditions.

[0087] The calculation range is taken as 40m from the two sides and the bottom surface to the nearest tunnel edge, and the upper side is taken to the ground. Displacement boundary conditions are adopted as the boundary conditions, the upper boundary is taken from the ground, which is a free surface, and both sides and bottom surfaces are subject to normal constraints. The elastic-plastic model is used for calculation, and the yield criterion adopts the Drucker-P...

Embodiment 2

[0091] The elastic foundation beam model is used to study the longitudinal force and deformation of the tunnel structure during shield tunnel construction in small radius curves, and determine the segment reinforcement rib scheme to strengthen the longitudinal stiffness of the tunnel.

[0092] According to the line parameters of the small-radius curve section, the minimum radius is selected for calculation. Since the segment links are connected by bolts, the longitudinal connection can be simulated as an elastic hinge, and the reduction in lining stiffness is considered. Considering different bolt strengths and tightening degrees, the reduction rates can be considered to be 0.3 and 0.5, respectively. The reinforcing ribs are located at 30m on the left and right of the curved section, and are formed by welding two channel steels with steel plates, and then connected with the reserved grouting holes of the segments with bolts, so as to connect the tunnel longitudinally to enhance...

Embodiment 3

[0113] Take the shield construction of a two-line overpass of an underground tunnel with small radius, shallow overburden, and large longitudinal slope as an example: there are complex lines with small radius curves, two-line overpass, shallow overburden, and large longitudinal slope at the same time in the overpass section of the project Type and compound proximity, where the minimum distance between the upper and lower sides of the interchange is 2.05m, the intersection angle is 19°, and the minimum radius is R=230m, which is the smallest curve radius of the current domestic subway shield tunnel. The shallowest covering soil in this section is only 1.91m. It is far lower than the standard requirement of 1D (shield tunnel diameter) covering soil thickness. The shield construction method of this project is as follows:

[0114] 1) Choose an earth pressure balance articulated shield machine equipped with 2 copying knives, over-excavation range of 100mm, Φ of 6340mm, jack stroke ...

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Abstract

The present invention discloses a shield construction of a two-wire overpass complex linear tunnel with small semi-diameter, shallow earth and large longitudinal slope, pertaining to the art of tunnel construction technology. The construction method provided by the present invention includes the following steps: the proceeding order of the two-wire overpass is confirmed; the shield construction model is selected; the auxiliary strengthening measures are taken for the surface, stratum and duct piece; the shield construction is advanced; the axial line is controlled and the construction is supervised; the shield construction enters into the tunnel. As the shield construction is provided with a hinged part and the sensitivity of the shield construction is increased, the present invention cancontrol the axial line of the tunnel more conveniently; due to the appropriate proposals of pressure strengthening, duct piece layout and reinforced rib, the situation of arc disintegration and the leakage of the duct piece is improved; high-frequency supervision and information feedback strictly control the parameters for advancing the shield construction. Due to the above measures, the present invention effectively controls the deformation and the displacement of the earth surface and the tunnel and reduces the complicated influences of constructing the tunnel first and last, thus ensuring the smooth construction and effective control of the tunnel deformation.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a shield tunnel construction method for a two-line interchange with small radius, shallow soil covering and large longitudinal slope complex line. Background technique [0002] The shield construction process will cause changes in the internal stress of the soil, change the strength of the soil structure, and cause the strata to move within a certain range around the tunnel. When the two-line tunnels are constructed close to each other, there will inevitably be complex mutual influences, especially the construction of the first tunnel will be affected by the construction of the subsequent tunnel; moreover, the successive construction of the tunnels will cause multiple disturbances and superimposed effects on the stratum, which will easily cause the surface to subside Overrun. If there is a compound line pattern of small radius, large longitudinal slope, and shallow o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/093E02D29/045E21D11/04
Inventor 李林崔学忠陈强
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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