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Construction method for shield tunnel to underneath pass through sensitive buildings in shallow-buried soft stratum

A technology of shield tunneling and weak ground, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as damage, unimaginable, settlement and deformation of buildings

Active Publication Date: 2020-10-30
CCCC SECOND HIGHWAY ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the rapid development of urban subway rail transit projects, it is inevitable that the lines will pass through some bustling blocks and sensitive building groups. Due to the limitation of line and ground environmental factors, some sensitive buildings cannot be dismantled or relocated from the scope of the construction line, especially when the shield tunnel passes through the existing buildings, the settlement needs to be strictly controlled. If the risk control fails, the building settlement deformation or damage, or cause other personal and property losses, and even lead to unimaginable consequences, which brings great safety risks and challenges to the construction parties involved in the subway construction

Method used

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  • Construction method for shield tunnel to underneath pass through sensitive buildings in shallow-buried soft stratum
  • Construction method for shield tunnel to underneath pass through sensitive buildings in shallow-buried soft stratum
  • Construction method for shield tunnel to underneath pass through sensitive buildings in shallow-buried soft stratum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] refer to figure 1 Shown is a construction method for a shield tunnel passing through a sensitive building group in a shallow buried soft ground, including the following steps,

[0061] Step 1: Construction preparation;

[0062] Step 2: stratum composite pre-grouting reinforcement treatment;

[0063] Two compound deep grouting methods, layered grouting on the ground and advanced grouting of the shield machine, are used to arrange oblique grouting reinforcement holes around the sensitive buildings, and grouting reinforcement into the grouting reinforcement holes;

[0064] Step 3: Conduct construction test in the non-underpass section;

[0065] Conduct construction tests in the non-underpass section, obtain and analyze settlement monitoring data and tunneling parameter data of the shield machine, and correct grouting reinforcement parameters according to the analysis results;

[0066] Step 4: The shield machine passes through sensitive buildings:

[0067] According to ...

Embodiment 2

[0070] refer to figure 1 Shown is a construction method for a shield tunnel passing through a sensitive building group in a shallow buried weak stratum, on the basis of Embodiment 1: the step 1 construction preparation includes the following steps:

[0071] The first step is to determine the characteristics, scale, structure and foundation treatment form of the sensitive buildings passing through the ground surface under the shield tunnel, in view of the design route of the shield tunnel passing through the non-removable and immovable sensitive buildings on the ground 2; Determine the construction geological conditions of shield tunnels passing through sensitive buildings;

[0072] In the second step, a plurality of first settlement observation points are set on the surface above the shield tunnel area along the tunnel axis, and a plurality of observation sections are set in the surface buildings perpendicular to the direction of the tunnel axis, and a plurality of second sett...

Embodiment 3

[0091] refer to Figure 1 to Figure 4 A construction method for a shield tunnel passing through a sensitive building complex in a shallow buried soft stratum is shown, on the basis of the first embodiment: the specific method of the compound pre-grouting reinforcement treatment of the stratum in the second step is as follows:

[0092] The first step is layered grouting on the ground:

[0093] Firstly, set oblique grouting holes on the surface 2 meters away from the sensitive buildings. The angle between the grouting holes and the horizontal plane is α, where 45°≤α≤60°, and the grouting hole spacing is 0.5m×0.5m , arranged in 2 rows in a plum blossom shape; the grouting pipe adopts steel sleeve valve pipe 3, the pipe length is 5.5 meters, the drilling diameter is φ50, and the diameter of the grouting pipe is φ42mm; the effective diffusion diameter of a single hole is 1m; the grouting slurry is made of cement Double liquid slurry composed of slurry and water glass slurry, where...

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Abstract

The invention belongs to the technical field of subway construction, and particularly relates to a construction method for a shield tunnel to underneath pass through sensitive buildings in a shallow-buried soft stratum. Through the four steps of construction preparation, combined type pre-grouting reinforcement treatment on the stratum, construction testing in a non-underpass section, and passingthrough the sensitive buildings by a shield tunneling machine, ground surface settlement and deformation are effectively controlled during underneath passing of the shield tunneling machine, and the safety of the sensitive buildings is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of subway construction, and in particular relates to a construction method for a shield tunnel passing through a sensitive building complex in a shallow buried soft ground. Background technique [0002] In recent years, with the rapid development of urban subway rail transit projects, it is inevitable that the lines will pass through some bustling blocks and sensitive building groups. Due to the limitation of line and ground environmental factors, some sensitive buildings cannot be dismantled or relocated from the scope of the construction line, especially when the shield tunnel passes through the existing buildings, the settlement needs to be strictly controlled. If the risk control fails, the building settlement deformation or Damage, or cause other aspects of personnel and property losses, and even lead to unimaginable consequences, which brings great safety risk challenges to the construction parties par...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/06E21D11/10C04B28/00C04B28/26
CPCE21D9/001E21D9/002E21D9/0671E21D9/0678E21D9/0685E21D11/10C04B28/00C04B28/26C04B2111/00724C04B14/06C04B18/08C04B14/104C04B7/00C04B22/002
Inventor 夏润禾许前顺肖飞朱增耀杨箭亮吴洪群王丽华杨梁福
Owner CCCC SECOND HIGHWAY ENG CO LTD
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