CN103147777B - Pumping paste prestress full bolting anchor rod/cable supporting method - Google Patents

Pumping paste prestress full bolting anchor rod/cable supporting method Download PDF

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CN103147777B
CN103147777B CN201310093673.1A CN201310093673A CN103147777B CN 103147777 B CN103147777 B CN 103147777B CN 201310093673 A CN201310093673 A CN 201310093673A CN 103147777 B CN103147777 B CN 103147777B
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slurries
lotion
anchoring
rope
rapid hardening
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CN103147777A (en
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张农
薛飞
阚甲广
赵一鸣
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention relates to a pumping paste prestress full bolting anchor rod/cable supporting method. Two kinds of paste grouting liquid with different solidification time are adopted as anchoring agents, a flexible pipe is inserted into a drilling hole, rapid hardening paste serous fluid is filled into the drilling hole through the flexible pipe, then, delayed coagulation paste serous fluid is filled into the drilling hole, an anchor rod/cable is inserted into the drilling hole, the exposed section of the anchor rod/cable is sequentially provided with an upper tray and a wedge-shaped anchor tool, after the rapid hardening paste serous fluid is solidified, a tensioning instrument tensions the outer exposed section of the anchor rod/cable, the pretightening force is exerted in the full-length range of the anchor rod/cable, and the full-length anchoring is formed after the delayed coagulation paste serous fluid is solidified. The pumping paste prestress full bolting anchor rod/cable supporting method has the advantages that the anchoring problem of deep holes can be solved, the control can be realized through regulating the addition quantity of rapid hardening agents, the inner and outer sections of the anchor rod/cable are respectively anchored by fast and slow paste serous fluid, the pretightening force and the full-length anchoring are organically combined, the construction process is simple, the control effect of the anchor rod/cable on the surrounding rock deformation is effectively improved, and the supporting problems of high-ground stress, high-dynamic-pressure and great-deformation roadway of the deep well are solved.

Description

The full anchor anchor pole/rope supporting method of pumping lotion prestressing force
Technical field
The present invention relates to control and the support technology of coal mine roadway country rock, especially a kind of full anchor anchor pole/rope supporting method of pumping lotion prestressing force being applicable to roadway surrounding rock.
Background technology
In ground and mining engineering, bolt support is the Surrounding Rock Control Technology having support concurrently and reinforce two kinds of effects, compared with frame set, extensive use is obtained in countries in the world with its significant technical economic benefit, with anchor pole be basic supporting form comprise monomer anchor pole, anchor beam (band), anchor beam (band) net and anchor pole and anchor pole/rope supporting Bolt System develop rapidly, be widely used in home and abroad colliery roadway support, become colliery and realize one of requisite key technology of high-yield and high-efficiency.
Prestressed anchor/rope is that a kind of anchorage depth developed on bolt support basis is large, supporting capacity is high, can applies the novel support technology of larger pretightning force, the self-bearing capacity of country rock can be transferred in a big way, under hard situation, (as large section roadway and crossover point, composite breaking roadway in the roof, Geological Structure Effect band etc.) adopt anchor pole/rope reinforcing technique, the stability and security of country rock can be ensured, now become the Main Means of complicated roadway reinforcing.
Along with to the increase of energy demand and the continuous increase of mining rate, superficial part resource reduces day by day, domestic and international many mines enter deep resource exploitation state all in succession, relative to shallow mining, the complex environment that deep rock mass is in " three high disturbances " intercouples, roadway deformation amount is large, deformation time long, rock crusher is serious, and anchor pole, rope lost efficacy more, and roadway maintenance is very difficult.Tradition prestressed anchor/rope generally adopts resin explosive roll to carry out end anchorage, although which adhesion strength is high, quick solidifying, security reliability are high, but prestressing force full length fastening cannot be realized, thus under heavily stressed large deformation condition, easily produce stress concentrated and disrumpent feelings.Generally adopt grouting mode to realize anchor pole/rope full length fastening at present, but there is hole-sealing technology complexity, the problem such as to run, spillage phenomenon is serious, anchoring effect is poor.Above-mentioned phenomenon has a strong impact on anchor pole/rope supporting to the control effects of country rock, particularly cannot solve a supporting difficult problem for deep weak broken, dynamic pressure, roadway with large deformation.
Summary of the invention
Technical problem: the object of the invention is to overcome weak point of the prior art, provides a kind of simple, easy construction, the effective full anchor anchor pole/rope supporting method of pumping lotion prestressing force.
Technical scheme: the full anchor anchor pole/rope supporting method of pumping lotion prestressing force of the present invention, be included in boring on the scar of tunnel, clear hole, its step is as follows:
The rapid hardening lotion slurries that a, preparation two kinds of setting times are different and slow setting lotion slurries;
The flexible pipe be connected with grouting pump is inserted, until the bottom of boring in b, boring on the scar of described tunnel;
C, calculate lotion slurries injection rate needed for the full anchoring of prestressing force according to boring, the diameter of anchor pole/rope and anchorage length, the length of setting rapid hardening lotion slurries anchoring section is 1/6 of drilling depth, and the length of slow setting lotion slurries anchoring section is 5/6 of drilling depth;
D, open grouting pump and first in boring, inject rapid hardening lotion slurries by flexible pipe, and then slow setting lotion slurries are injected in boring, two kinds of lotion slurries inject while slowly extracted out by flexible pipe, make rapid hardening lotion slurries, slow setting lotion slurries fill up and extract the space of flexible pipe out;
E, inserted in boring anchor pole/rope, the rapid hardening lotion slurries extruded, slow setting lotion slurries are filled in the annulus around anchor pole/rope, load onto pallet, wedge shape ground tackle successively at the revealed section of anchor pole/rope;
F, after rapid hardening lotion grout cures, use stretch-draw instrument to carry out stretch-draw to anchor pole/rope revealed section, in anchor pole/rope length range, apply pretightning force, after slow setting lotion grout cures, namely form full length fastening.
Described rapid hardening lotion slurries are configured in mass ratio formed by water, cement, anchoring additive, accelerating admixtures, wherein the mass ratio of water and cement is 0.25 ~ 0.35, anchoring additive is 3% ~ 5% of cement amount, and accelerating admixture is 2% ~ 3% of cement amount, and setting time is 30min.
Described slow setting lotion slurries are configured in mass ratio formed by water, cement, anchoring additives, and wherein the mass ratio of water and cement is 0.25 ~ 0.35, and anchoring additive is 3% ~ 5% of cement amount, and setting time is 6 hours.
Beneficial effect: the different lotion injection slurry of our bright employing two kinds of setting times is as Anchor Agent, there is good thixotropy and mobility, its Marsh funnel viscosity value can reach about 50s, stream pendant phenomenon can not be there is because of gravity effect, ordinary Portland cement slurries can be effectively avoided easily to run problem leakage, it is poor that the lotion slurries that simultaneously two kinds of setting time speeds are different have enough setting times, after rapid hardening lotion grout cures, namely pretightning force is applied to anchor pole/rope, slow setting lotion slurries just can solidify after complete prestressing force a period of time to be applied, so just pretightning force is combined with full length fastening, effectively improve the control effects of anchor pole/rope to surrouding rock deformation, a supporting difficult problem for the strong dynamic pressure roadway with large deformation of deep-well high-ground stress can be solved.The present invention can realize the full length fastening of prestressed anchor/rope, effective raising single anchor rod/rope is to the anchored force of country rock, thus improve supporting effect of roadway, reduce the support density of anchor pole/rope, more traditional end anchorage mode anchoring body allowable transformation amount is larger, can solve a deep-well high stress tunnel supporting difficult problem.The present invention also can be used in the surrounding rock supporting in other ground, water conservancy and defence construction.Effectively can solve that the anchorage length that existing anchor pole/rope support technology exists is limited, the problem of the roadway surrounding rock large deformation that can not adapt under the condition of high ground stress of deep.Its method simply, is easily constructed, anchoring effect is good, and tool is practicality widely.
Accompanying drawing explanation
Fig. 1 is slip casting process schematic of the present invention;
Fig. 2 is anchor pole/rope scheme of installation.
In figure, 1-tunnel scar, 2-holes, 3-flexible pipe, 4-rapid hardening lotion slurries, 5-slow setting lotion slurries, 6-anchor pole/rope, 7-pallet, 8-wedge shape ground tackle.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are further described:
Embodiment 1,
(1) be 0.25 carry out mixing slurry and configure rapid hardening lotion slurries 4, slow setting lotion slurries 5 respectively by water and cement quality ratio: get cement 2000 grams, 500 grams, water, the FLOWCABLE anchoring additive 60 grams produced by BASF AG, accelerating admixture 40 grams, prepares rapid hardening lotion slurries 4 after stirring completely; Get cement 2000 grams again, 500 grams, water, the FLOWCABLE anchoring additive 60 grams produced by BASF AG, prepares slow setting lotion slurries 5 after stirring completely;
(2) at tunnel scar 1 construction drill 2, bore diameter is 28mm, and drilling depth is 6000mm, and clear hole;
(3) flexible pipe 3 of to be 15mm external diameter by internal diameter be 22mm inserts the bottom of boring 2;
(4) according to diameter and the anchorage length of boring 2, anchor pole/rope 6, lotion slurries injection rate needed for the full anchoring of prestressing force is calculated by following formula,
In formula s-lotion slurries injection rate;
d-bore diameter;
d-anchor pole/rope diameter;
l-anchorage length
Get that bore diameter is 28mm, anchor pole/rope diameter is 22mm, the length of rapid hardening lotion slurries 4 anchoring section is 1000mm, and the length of slow setting lotion slurries 5 anchoring section is 5000mm,
Then above-mentioned formulae discovery goes out rapid hardening lotion slurries 4, the injection rate of slow setting lotion slurries 5 is respectively 0.24L, 1.18L,
(5) open grouting pump, by configure rapid hardening lotion slurries 4, slow setting lotion slurries 5 by flexible pipe 3 injection hole 2, control injection rate by the metering device on grouting pump; First in boring 2, inject rapid hardening lotion slurries 4, and then in boring 2, inject slow setting lotion slurries 5, two kinds of lotion slurries inject flexible pipe 3 is slowly extracted out, make rapid hardening lotion slurries 4, space that slow setting lotion slurries 5 fill up extraction flexible pipe 3;
(6) anchor pole/rope 6 of to be 22mm length by diameter be 6300mm inserts in boring 2, and the rapid hardening lotion slurries 4 extruded, slow setting lotion slurries 5 are filled in the annulus around anchor pole/rope 6, install pallet 7, wedge shape ground tackle 8 successively at the revealed section of anchor pole/rope 6;
(7) after rapid hardening lotion slurries 4 solidify 30min, use stretch-draw instrument to carry out stretch-draw pretension to anchor pole/rope 6, in anchor pole/rope 6 length range, apply pretightning force, finally after slow setting lotion slurries 5 solidify 6 hours, namely form full length fastening.
Embodiment 2,
Substantially the same manner as Example 1, something in common slightly.Difference: be 0.3 carry out mixing slurry and configure rapid hardening lotion slurries 4, slow setting lotion slurries 5 respectively by water and cement quality ratio: get cement 2000 grams, 600 grams, water, the FLOWCABLE anchoring additive 60 grams produced by BASF AG, accelerating admixture 40 grams, namely obtains required rapid hardening lotion slurries 4 after stirring completely; Get cement 2000 grams again, 600 grams, water, the FLOWCABLE anchoring additive 60 grams produced by BASF AG, after stirring completely, namely obtain required slow setting lotion slurries 5.
Embodiment 3,
Substantially the same manner as Example 1, something in common slightly.Difference: be 0.35 carry out mixing that slurry configures soon respectively, lotion slurries 4,5 slowly by water ash mass ratio: get cement 2000 grams, 700 grams, water, the FLOWCABLE anchoring additive 60 grams produced by BASF AG, accelerating admixture 40 grams, namely obtains required rapid hardening lotion slurries 4 after stirring completely; Get cement 2000 grams again, 700 grams, water, the FLOWCABLE anchoring additive 60 grams produced by BASF AG, after stirring completely, namely obtain required slow setting lotion slurries 5.

Claims (1)

1. the full anchor anchor pole/rope supporting method of pumping lotion prestressing force, is included in the upper boring (2) of tunnel scar (1), clear hole, it is characterized in that:
The rapid hardening lotion slurries (4) that a, preparation two kinds of setting times are different and slow setting lotion slurries (5); Described rapid hardening lotion slurries (4) are configured in mass ratio formed by water, cement, anchoring additive, accelerating admixtures, wherein the mass ratio of water and cement is 0.25 ~ 0.35, anchoring additive is 3% ~ 5% of cement amount, and accelerating admixture is 2% ~ 3% of cement amount, and setting time is 30min; Described slow setting lotion slurries (5) are configured in mass ratio formed by water, cement, anchoring additives, and wherein the mass ratio of water and cement is 0.25 ~ 0.35, and anchoring additive is 3% ~ 5% of cement amount, and setting time is 6 hours;
The flexible pipe (3) be connected with grouting pump is inserted, until the bottom of hole (2) in b, boring (2) on described tunnel scar (1);
C, calculate lotion slurries injection rate needed for the full anchoring of prestressing force according to boring (2), the diameter of anchor pole/rope (6) and anchorage length, set the length of rapid hardening lotion slurries (4) anchoring section as 1/6 of (2) degree of depth of holing, the length of slow setting lotion slurries (5) anchoring section is 5/6 of boring (2) degree of depth;
D, open grouting pump and first in boring (2), inject rapid hardening lotion slurries (4) by flexible pipe (3), and then slow setting lotion slurries (5) is injected in boring (2), two kinds of lotion slurries inject while slowly extracted out by flexible pipe (3), make rapid hardening lotion slurries (4), slow setting lotion slurries (5) fill up extract out flexible pipe (3) space;
E, by anchor pole/rope (6) insert boring (2) in, the rapid hardening lotion slurries (4) extruded, slow setting lotion slurries (5) are filled in anchor pole/rope (6) annulus around, load onto pallet (7), wedge shape ground tackle (8) successively at the revealed section of anchor pole/rope (6);
F, after rapid hardening lotion slurries (4) solidify, stretch-draw instrument is used to carry out stretch-draw to anchor pole/rope (6) revealed section, in anchor pole/rope (6) length range, apply pretightning force, after slow setting lotion slurries (5) solidify, namely form full length fastening.
CN201310093673.1A 2013-03-22 2013-03-22 Pumping paste prestress full bolting anchor rod/cable supporting method Active CN103147777B (en)

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CN103758549B (en) * 2014-01-09 2016-09-28 中国矿业大学 Anchor prestressing force full-length anchorage support method after a kind of first filling based on ointment material
CN104343460A (en) * 2014-09-26 2015-02-11 徐州矿务集团有限公司 Surrounding rock support method adopting tensioning type pre-tightening anchor rod
CN104500115B (en) * 2014-12-15 2016-09-14 王振伟 A kind of prestressing force Bolt method for protecting support
CN106546419A (en) * 2015-12-09 2017-03-29 西安科技大学 A kind of physical simulation experiment anchor pole/rope mechanization method for protecting support

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US7775745B2 (en) * 2009-01-20 2010-08-17 J-Lok Co. Anchoring systems and methods of use thereof
CN102146673A (en) * 2011-02-27 2011-08-10 山东科技大学 Anchoring structure for liquid-injection corrosion-resistant anchor rod or anchor cable and construction method thereof
CN102748048A (en) * 2012-07-17 2012-10-24 安徽省煤炭科学研究院 Hole wall grouting anchor cable
CN102865088B (en) * 2012-09-12 2015-04-08 山东科技大学 Tension and compression coupling type high-strength and high-deformation anchor rod and method for using same

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