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Construction method for shallow-buried bias tunnel portal

A construction method and tunnel technology, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve potential safety hazards, affect tunnel construction safety and use safety, etc., to improve safety, improve stable support capabilities, and improve construction The effect of safety and efficiency

Inactive Publication Date: 2021-02-19
中交一公局第五工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a construction method for shallow-buried bias-pressured tunnel entrances, which solves the potential safety hazards caused by common geological factors in tunnel construction, such as shallow-buried and biased pressure, which seriously affect the tunnel construction process. Construction safety and use safety issues

Method used

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Embodiment

[0035] An embodiment of the present invention provides a construction method for a shallow-buried bias-voltage tunnel entrance, which includes the following steps:

[0036] S1. Pre-construction measurement: Before the opening of the excavation project, the following preparations for the measurement should be done:

[0037] a). Review of the surface of the hole;

[0038] b). Stakeout of the hole brush slope line;

[0039] S2. Pre-embedding for surface subsidence observation: select a section close to the top of the intercepting ditch with good visibility and convenient measurement to pre-embed a firm reference point. The measuring points are arranged along the ground along the tunnel axis and 4 points on both sides;

[0040] S3. Tunnel construction: including the tunnel entrance construction process and the tunnel exit construction process;

[0041] S3-1. The construction process at the entrance is carried out in the order of intercepting ditch at the top of the cave → layere...

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PUM

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Abstract

The invention provides a construction method for a shallow-buried bias tunnel portal, and relates to the technical field of tunnel construction. The construction method for the shallow-buried bias tunnel portal comprises the following steps that S1, measurement is conducted before construction; S2, surface settlement observation and pre-burying is carried out; S3, a hole is constructed; S4, a holeis excavated; S5, hole edge and upward slope protection is performed; S6, the foundation of the hole section is reinforced; S7, a left cantilevered wing wall at the outlet end is constructed; and S8,an advanced large pipe shed is constructed. According to the construction method for the shallow-buried bias tunnel portal, through some necessary measures and construction modes, disturbance of geological factors and the construction process to a rock stratum is reduced, and then the purpose of improving the construction safety and efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for constructing an entrance of a shallow-buried bias-voltage tunnel. Background technique [0002] The tunnel construction is obviously affected by the surrounding rock. If the stability and reliability of the surrounding rock are insufficient, the safety of the tunnel construction may be disturbed or even cause the tunnel to collapse, which seriously threatens the safety of the tunnel. Bias pressure is a common type of surrounding rock in tunnel engineering. If reasonable tunnel construction techniques cannot be adopted, hidden dangers will increase. [0003] Shallow burial and bias pressure are common geological factors in tunnel construction. Shallow burial is due to the fact that the coverage on the tunnel cannot meet the needs of tunnel excavation construction, and it is prone to deep subsidence on the surface. Affected by precipitation, it is extremely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14E21D9/00E21D9/12E21D11/10E21D20/02
CPCE21D9/14E21D9/003E21D9/12E21D11/105E21D20/021
Inventor 李晓亮信国军董丽钢刘科元杨勋
Owner 中交一公局第五工程有限公司