Processing method of weak surrounding rock of substrate of novel tunnel invert

A technology for weak surrounding rocks and treatment methods, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of large settlement, long duration, and no attention paid to it, and achieve fast speed, less materials, and safe operation Effect

Inactive Publication Date: 2018-08-10
SINOHYDRO BUREAU 14 CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the construction of weak surrounding rock in the tunnel only pays attention to the tunnel excavation method and the selection of the main support parameters of the tunnel. The treatment of the weak surrounding rock at the base of the inverted arch has not attracted much attention. long

Method used

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  • Processing method of weak surrounding rock of substrate of novel tunnel invert
  • Processing method of weak surrounding rock of substrate of novel tunnel invert
  • Processing method of weak surrounding rock of substrate of novel tunnel invert

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Experimental program
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Embodiment

[0025] A new type of method for treating weak surrounding rock at the base of an inverted arch of a tunnel. The specific steps are as follows:

[0026] 1) Excavation and leveling of tunnel inverted arch

[0027] The tunnel inverted arch is excavated according to the size of the design drawing and manually leveled;

[0028] 2) Initial support of inverted arch

[0029] Firstly, the base of the inverted arch is sprayed with C25 concrete for 4cm, and I22 I-beams are installed on the base of the inverted arch of shotcrete. The distance between two adjacent I22 I-beams is 0.6m. I22 I-beam welded distribution bars are arranged, and the distance between Φ25 threaded steel bars is 1m, the steel arch frame is connected as a whole, and finally C25 concrete is sprayed to the design thickness;

[0030] 3) drilling

[0031] Drill holes vertically on the initial support surface of the inverted arch with a hand drill, and install Φ50mm steel pipes 1, Φ50mm steel pipes 1 are arranged in a q...

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Abstract

The invention relates to a processing method of weak surrounding rock of a substrate of a novel tunnel invert and belongs to the technical field of construction engineering. The processing method comprises the following specific steps: 1) excavation and leveling of the tunnel invert: excavating the tunnel invert according to the size of a design drawing, and artificially leveling the excavated tunnel invert; 2) performing primary support on the invert; 3) drilling: vertically drilling the primary support surface of the invert by adopting a hand drill, mounting steel pipes of which the diameteris phi 50mm at an interval of 1m in a quincuncial shape, and drilling grouting holes in the pipe walls of the steel pipes in a quincuncial shape; 4) grouting: filling cement grout after the steel pipes are drilled, when the underground water of the substrate of the invert is larger, filling cement-soluble glass grout, and during construction, when the grouting pressure in each hole reaches the designed grouting pressure, finishing grouting; and 5) after construction of the cement grout of the steel pipes is completed, normally constructing the invert and filling the invert according to the requirements of the design drawing. The processing method provided by the invention reduces the influence of foundation settlement of the weak surrounding rock as much as possible and ensures the quality of the main structure of the tunnel, the engineering quality and the operation safety of the tunnel.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a method for treating weak surrounding rock of a tunnel inverted arch base. Background technique [0002] At present, the construction of weak surrounding rock in the tunnel only pays attention to the tunnel excavation method and the selection of the main support parameters of the tunnel. The treatment of the weak surrounding rock at the base of the inverted arch has not attracted great attention. long. In the construction of tunnel projects on weak surrounding rocks, the potential post-construction settlement will cause great harm to transportation and the main structure of the tunnel. Therefore, reasonable and effective reinforcement measures should be taken for weak foundations. There are many methods of soft soil foundation treatment, each with its advantages, disadvantages and limitations. How to choose a reasonable foundation treatment method i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/14E21D11/10E21D11/20E21D11/18
CPCE21D9/001E21D11/10E21D11/107E21D11/14E21D11/18E21D11/20
Inventor 周刚梁志强崔成涛邹智波
Owner SINOHYDRO BUREAU 14 CO LTD
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