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Advance support fast construction method in shallow tunnelling loose pebble bed

It is a technology of shallow burial and underground excavation and advanced support, which is used in earth-moving drilling, mining equipment, installation of bolts, etc., to achieve the effect of controlling slurry diffusion, high rigidity and speeding up grouting speed.

Active Publication Date: 2010-09-01
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no mature technology of "shallow burial and underground excavation meets loose floating pebble layer, advanced support and rapid construction"

Method used

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Embodiment Construction

[0022] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0023] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0024] A rapid construction method for advanced support in shallow buried excavation loose floating pebble layer, comprising the following steps:

[0025] A. Excavate the core soil in circular excavation on the upper steps of the tunnel, and erect steel frames;

[0026] B. Selection of drilling rig: Guide rail type independent rotary rock drill is adopted, and the main technical parameters should meet:

[0027] Dimensions (length × width × h...

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PUM

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Abstract

The invention discloses an advance support fast construction method in shallow tunnelling loose pebble bed. A guide rail type independent rotary rock drill and a triangle drilling rig are adopted, and a self-advancing hollow grouting anchor bar is adopted to drive the advance support rod body; multi-hole spacing grouting is adopted, and appropriate double grout matching is selected. The invention has the beneficial effects that: part of pebble can be impacted to be crushed or be extruded into a hole, the problems of shifting and aligning of heavy duty drill in a narrow underground tunnel are effectively solved; not only grouting speed is increased, but also grout diffusion can be better controlled; the method can adapt loose pebble stratum well, not only perfect diffusion effect of grouting can be achieved, but also single-hole long-distance diffusion can be controlled, and reinforcing in unpermitted range can be achieved.

Description

technical field [0001] The invention relates to a construction method for a rail transit underground project, in particular to a construction method for advance support in a shallow buried excavation loose floating pebble layer. Background technique [0002] Shallow burial and underground excavation will collapse at the touch of a loose floating pebble layer, and the construction is very difficult. Using traditional advance support, it is very difficult to form a hole, and it is extremely difficult to grasp the direction. It is also very difficult to insert the rod body after the hole is formed. Most of the holes are blocked, and grouting is also difficult; surface drilling grouting is difficult to control the grouting range, consumes a lot of cement, and it is also difficult to form holes, and the surface may not have conditions, and the effect is very uncertain; use full-section closed grouting , The range of grouting is relatively easy to control, and it is also difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D20/00
Inventor 罗兴财卿三惠耿开亮罗飚
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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