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Rockburst tunnel section primary support method and support anchor rod structure

A technology of primary support and bolt, which is applied in the installation of bolt, earthwork drilling, wellbore lining, etc. It can solve problems affecting construction progress, hidden dangers of construction safety, and ejection of rock blocks, so as to save investment, enhance integrity, Avoid the effect of shedding

Pending Publication Date: 2021-02-23
CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the rockburst tunnel section, watering is generally used to reduce rock brittleness, leading pilot tunnels and drill holes to relieve stress, early spraying, anchoring and netting support, etc., but in moderate and strong rockburst tunneling sections, if only spraying, anchoring and hanging are used as support measures. There may still be a phenomenon of rock ejection, and there are certain construction safety hazards. If steel arches are added to strengthen the support, it will be uneconomical and affect the construction progress.

Method used

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  • Rockburst tunnel section primary support method and support anchor rod structure
  • Rockburst tunnel section primary support method and support anchor rod structure
  • Rockburst tunnel section primary support method and support anchor rod structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The initial support method for the rockburst tunnel section includes the following steps:

[0036] 1) Carry out hole excavation along the excavation direction;

[0037] 2) Clean the rock surface of the cavern section after excavation;

[0038] 3) Spray concrete to the rock face and form the first concrete layer 1;

[0039] 4) Drill anchor holes 5 extending to the rock body on the surface layer of the first concrete layer 1;

[0040] 5) Install anchor rod 2;

[0041] 6) Lay reinforcement mesh 3 on the surface layer of the first concrete layer 1;

[0042] 7) Connect the exposed part of the anchor rod 2 through the connecting rib 19, and spot welding is used for the connecting position;

[0043] 8) Spraying concrete on the surface of the first concrete layer 1 to form the second concrete layer 4;

[0044] 9) Repeat steps 1)-8) to complete the hole excavation construction.

[0045] In a preferred solution, in step 5), after the installation of the anchor rod 2 is comp...

Embodiment 2

[0053] On the basis of Embodiment 1, the connecting rib 19 includes an axial connecting rib 191 and a radial connecting rib 192. The axial connecting rib 191 connects the ends of a plurality of anchor rods 2 along the axial direction of the cavity, and the radial connecting rib 192 The connecting rib 192 connects the ends of multiple anchor rods 2 along the radial direction of the cavity.

[0054] In a preferred solution, the axial connecting ribs 191 are arranged in an "X" shape along the axial direction of the cavity, the axial connecting ribs 191 and the radial connecting ribs 192 are spot welded at the intersecting positions, and the axial connecting ribs 191 and the radial The connecting ribs 192 are welded to the connecting ribs 19 to form triangular holes for strengthening the strength of the connecting ribs 19 .

Embodiment 3

[0056] On the basis of embodiment 1,

[0057] The support bolt used for the initial support method of the above-mentioned rockburst tunnel section has the following specific structure:

[0058] The anchor 2 includes a first anchor section 6 and a second anchor section 7, and both the first anchor section 6 and the second anchor section 7 are hollow structures;

[0059] One end of the first anchor section 6 is an anchor head, and the other end is provided with a first fixing seat 8;

[0060] The second anchor section 7 is fixed with a second fixing seat 9 on the part of the outer wall located in the surrounding rock, and a backing plate 16 is provided on the outer wall of the second anchor section 7 near the other end;

[0061] An energy release spring 10 is arranged between the first fixing seat 8 and the second fixing seat 9 , and both ends of the energy releasing spring 10 are respectively fixed on the first fixing seat 8 and the second fixing seat 9 .

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Abstract

The invention discloses a rockburst tunnel section primary support method. The method comprises the following steps of 1), excavating a tunnel; 2), rock surface cleaning; 3), spraying a first concretelayer; 4) ,drilling anchoring holes; 5), installing anchor rods; 6), laying a reinforcing mesh; 7), connecting the exposed parts of the anchor rods with connecting ribs by spot welding; 8), sprayinga second concrete layer; and 9), repeating the steps from step 1) and the step 8) to complete hole digging construction. By the adoption of the method, overlarge deformation of surrounding rock can berestrained in time, the integrity of a primary supporting system is enhanced, the problem that rock blocks are still ejected after bolting-shotcreting supporting is conducted on a rockburst tunnel section is solved, the supporting work amount is reduced, investment is saved, the construction progress is accelerated, and the technical safety risk of original supporting measures can be effectivelyreduced.

Description

technical field [0001] The invention relates to the technical field of tunnel support, in particular to an initial support method for a rockburst tunnel section and a support bolt structure. Background technique [0002] Rockburst is a phenomenon in which the elastic variable energy accumulated in a rock mass is suddenly and violently released under certain conditions, causing the rock to burst and be ejected. When excavating tunnels in areas with high ground stress, rockbursts are a serious problem, and accidents involving injuries and equipment damage have occurred. At present, in the rockburst tunnel section, watering is generally used to reduce rock brittleness, leading pilot tunnels and drill holes to relieve stress, early spraying, anchoring and netting support, etc., but in moderate and strong rockburst tunneling sections, if only spraying, anchoring and hanging are used as support measures. There is still a possibility that rock blocks will be ejected, and there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D11/10E21D11/14
CPCE21D21/0026E21D21/0093E21D11/10E21D11/14
Inventor 刘军伟乔雁彬李小卫伍赛吴昊谢东佑
Owner CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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