CN103147777A - Pumping paste prestress full bolting anchor rod/cable supporting method - Google Patents
Pumping paste prestress full bolting anchor rod/cable supporting method Download PDFInfo
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- CN103147777A CN103147777A CN2013100936731A CN201310093673A CN103147777A CN 103147777 A CN103147777 A CN 103147777A CN 2013100936731 A CN2013100936731 A CN 2013100936731A CN 201310093673 A CN201310093673 A CN 201310093673A CN 103147777 A CN103147777 A CN 103147777A
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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
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 of pumping lotion prestressing force that is applicable to roadway surrounding rock/rope supporting method.
Background technology
In ground and mining engineering, bolt support is the Surrounding Rock Control Technology that has support concurrently and reinforce two kinds of effects, compare with frame set, obtain extensive use with its significant technical economic benefit in countries in the world, the Bolt System development that comprises monomer anchor pole, anchor beam (band), anchor beam (band) net and anchor pole and anchor pole/rope supporting take anchor pole as the basic supporting form rapidly, be widely used in home and abroad colliery roadway support, become the colliery and realize one of requisite key technology of high-yield and high-efficiency.
Prestressed anchor/rope is that a kind of anchorage depth that develops is large, supporting capacity is high, can applies the novel support technology of larger pretightning force on the bolt support basis, can transfer the self-bearing capacity of country rock in a big way, (affect band etc. as large section roadway and crossover point, composite breaking roadway in the roof, geological structure) and adopt anchor pole/rope reinforcing technique under hard situation, can guarantee the stability and security of country rock, now become the Main Means of difficult tunnel reinforcing.
Along with to the increase of energy demand and the continuous increase of mining rate, the superficial part resource reduces day by day, domestic and international many mines all enter deep resource exploitation state in succession, with respect to shallow mining, deep rock mass is in the complex environment that " three high disturbances " intercouples, the roadway deformation amount is large, deformation time is 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 this mode adhesion strength is high, quick solidifying, security reliability are high, but can't realize the prestressing force full length fastening, thereby it is concentrated and disrumpent feelings easily to produce stress under heavily stressed large deformation condition.At present in order to realize that anchor pole/rope full length fastening generally adopts grouting mode, but exist the hole-sealing technology complexity, the problem such as run, the spillage phenomenon is serious, anchoring effect is relatively poor.Above-mentioned phenomenon has a strong impact on anchor pole/rope supporting to the control effect of country rock, particularly can't solve the supporting difficult problem of deep weak broken, dynamic pressure, roadway with large deformation.
Summary of the invention
Technical problem: the objective of the invention is to overcome weak point of the prior art, a kind of simple, easily construction, the effective full anchor anchor pole of pumping lotion prestressing force/rope supporting method are provided.
Technical scheme: the full anchor anchor pole of pumping lotion prestressing force of the present invention/rope supporting method, be included in boring on the scar of tunnel, clear hole, its step is as follows:
A, two kinds of rapid hardening lotion slurries and slow setting lotion slurries that setting time is different of preparation;
Insert the flexible pipe that is connected with grouting pump in b, the boring on the scar of described tunnel, until the bottom of boring;
C, calculate the required lotion slurries of the full anchoring of prestressing force injection rate according to diameter and the anchorage length of boring, anchor pole/rope, 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 inject rapid hardening lotion slurries in boring by flexible pipe, and then inject slow setting lotion slurries in boring, two kinds of lotion slurries are slowly extracted flexible pipe out while injecting, and make rapid hardening lotion slurries, slow setting lotion slurries fill up the space of extracting flexible pipe out;
E, anchor pole/rope is inserted in boring, the rapid hardening lotion slurries of extruding, slow setting lotion slurries are filled in annulus around anchor pole/rope, load onto successively pallet, wedge shape ground tackle at the revealed section of anchor pole/rope;
F, after rapid hardening lotion slurries solidify, use the stretch-draw instrument to carry out stretch-draw to anchor pole/rope revealed section, apply pretightning force in anchor pole/rope length range, namely form full length fastening after slow setting lotion slurries solidify.
Described rapid hardening lotion slurries are configured in mass ratio and are formed by water, cement, anchoring additive, accelerating admixture, wherein the mass ratio of water and cement is 0.25 ~ 0.35, the 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 and are formed by water, cement, anchoring additive, and wherein the mass ratio of water and cement is 0.25 ~ 0.35, and the anchoring additive is 3% ~ 5% of cement amount, and setting time is 6 hours.
beneficial effect: the different lotion injection slurry of two kinds of setting times of our bright employing is as Anchor Agent, have thixotropy and mobility preferably, its Marsh funnel viscosity value can reach the 50s left and right, can stream pendant phenomenon not appear because of gravity effect, can effectively avoid the ordinary Portland cement slurries easily to run leakage problem, it is poor that while two kinds of different lotion slurries of setting time speed have enough setting times, after solidifying, rapid hardening lotion slurries namely anchor pole/rope is applied pretightning force, slow setting lotion slurries complete prestressing force to be applied just can solidify after a period of time, so just pretightning force and full length fastening are combined, effectively improved the control effect of anchor pole/rope to surrouding rock deformation, can solve the supporting difficult problem of the strong dynamic pressure roadway with large deformation of deep-well high-ground stress.The present invention can realize the full length fastening of prestressed anchor/rope, effectively improve single anchor pole/rope to the anchored force of country rock, thereby improve supporting effect of roadway, reduce the support density of anchor pole/rope, more traditional end anchorage mode anchoring body allows deflection larger, can solve a deep-well high stress tunnel supporting difficult problem.The present invention also can be used in surrounding rock supporting in other ground, water conservancy and defence construction.Can effectively solve the problem that the anchorage length that existing anchor pole/rope support technology exists is limited, can not adapt to the roadway surrounding rock large deformation under the condition of high ground stress of deep.Its method is simple, easily construction, anchoring effect are good, and tool is practicality widely.
Description of drawings
Fig. 1 is slip casting process schematic diagram of the present invention;
Fig. 2 is anchor pole/rope scheme of installation.
In figure, 1-tunnel scar, 2-boring, 3-flexible pipe, 4-rapid hardening lotion slurries, 5-slow setting lotion slurries, 6-anchor pole/rope, 7-pallet, 8-wedge shape ground tackle.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described:
Embodiment 1,
(1) be 0.25 to mix slurry and configure respectively rapid hardening lotion slurries 4, slow setting lotion slurries 5 by water and cement quality ratio: get cement 2000 grams, water 500 grams, FLOWCABLE anchoring additive 60 grams by BASF AG's production, accelerating admixture 40 grams are prepared rapid hardening lotion slurries 4 after stirring fully; Get cement 2000 grams, water 500 grams by FLOWCABLE anchoring additive 60 grams that BASF AG produces, are prepared slow setting lotion slurries 5 after stirring fully again;
(2) at tunnel scar 1 construction drill 2, bore diameter is 28mm, and drilling depth is 6000mm, and clear hole;
(3) be that the 15mm external diameter is the bottom of the flexible pipe 3 insertion borings 2 of 22mm with internal diameter;
(4) according to diameter and the anchorage length of boring 2, anchor pole/rope 6, calculate the required lotion slurries of the full anchoring of prestressing force injection rate by following formula,
In formula
s-lotion slurries injection rate;
D-bore diameter;
d-anchor pole/rope diameter;
l—Anchorage length
Getting bore diameter is that 28mm, anchor pole/rope diameter are 22mm, and the length of rapid hardening lotion slurries 4 anchoring sections is 1000mm, and the length of slow setting lotion slurries 5 anchoring sections is 5000mm,
The above-mentioned formula injection rate that calculates rapid hardening lotion slurries 4, slow setting lotion slurries 5 is respectively 0.24L, 1.18L,
(5) open grouting pump, rapid hardening lotion slurries 4, the slow setting lotion slurries 5 that configure are passed through to control injection rate by the metering device on grouting pump in flexible pipe 3 injection holes 2; First to boring 2 interior injection rapid hardening lotion slurries 4, and then to boring 2 interior injection slow setting lotion slurries 5, while two kinds of lotion slurries inject, flexible pipe 3 is slowly extracted out, make rapid hardening lotion slurries 4, slow setting lotion slurries 5 fill up the space of extracting flexible pipe 3 out;
(6) be that 22mm length is that anchor pole/rope 6 of 6300mm inserts in boring 2 with diameter, the rapid hardening lotion slurries 4 of extruding, slow setting lotion slurries 5 are filled in annulus around anchor pole/rope 6, install successively pallet 7, wedge shape ground tackle 8 at the revealed section of anchor pole/rope 6;
(7) after rapid hardening lotion slurries 4 solidify 30min, use the stretch-draw instrument to carry out the stretch-draw pretension to anchor pole/rope 6, apply pretightning force in anchor pole/rope 6 length range, after solidifying 6 hours, slow setting lotion slurries 5 namely form full length fastening at last.
Embodiment 2,
Substantially the same manner as Example 1, something in common slightly.Difference: be 0.3 to mix slurry and configure respectively rapid hardening lotion slurries 4, slow setting lotion slurries 5 by water and cement quality ratio: get cement 2000 grams, water 600 grams, FLOWCABLE anchoring additive 60 grams by BASF AG's production, accelerating admixture 40 grams namely get required rapid hardening lotion slurries 4 after stirring fully; Get again cement 2000 grams, water 600 grams, FLOWCABLE anchoring additive 60 grams by BASF AG produces namely get required slow setting lotion slurries 5 after stirring fully.
Embodiment 3,
Substantially the same manner as Example 1, something in common slightly.Difference: be 0.35 to mix that slurry configures respectively soon, lotion slurries 4,5 slowly by water ash mass ratio: get cement 2000 grams, water 700 grams, by FLOWCABLE anchoring additive 60 grams that BASF AG produces, accelerating admixture 40 grams namely get required rapid hardening lotion slurries 4 after stirring fully; Get again cement 2000 grams, water 700 grams, FLOWCABLE anchoring additive 60 grams by BASF AG produces namely get required slow setting lotion slurries 5 after stirring fully.
Claims (3)
1. the full anchor anchor pole of pumping lotion prestressing force/rope supporting method, be included in the upper boring of tunnel scar (1) (2), clear hole, it is characterized in that:
A, two kinds of rapid hardening lotion slurries (4) and slow setting lotion slurries (5) that setting time is different of preparation;
Insert the flexible pipe (3) that is connected with grouting pump in b, the boring (2) on described tunnel scar (1), until the bottom of boring (2);
C, calculate the required lotion slurries of the full anchoring of prestressing force injection rate according to diameter and the anchorage length of boring (2), anchor pole/rope (6), the length of setting rapid hardening lotion slurries (4) anchoring section is 1/6 of boring (2) degree of depth, and 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 inject rapid hardening lotion slurries (4) in boring (2) by flexible pipe (3), and then inject slow setting lotion slurries (5) in boring (2), two kinds of lotion slurries are slowly extracted flexible pipe (3) out while injecting, and make rapid hardening lotion slurries (4), slow setting lotion slurries (5) fill up the space of extracting flexible pipe (3) out;
E, anchor pole/rope (6) is inserted in boring (2), the rapid hardening lotion slurries (4) of extruding, slow setting lotion slurries (5) are filled in anchor pole/rope (6) annulus on every side, load onto successively pallet (7), wedge shape ground tackle (8) at the revealed section of anchor pole/rope (6);
F, after rapid hardening lotion slurries (4) solidify, use the stretch-draw instrument to carry out stretch-draw to anchor pole/rope (6) revealed section, apply pretightning force in anchor pole/rope (6) length range, namely form full length fastening after slow setting lotion slurries (5) solidify.
2. the full anchor anchor pole of pumping lotion prestressing force/rope supporting method according to claim 1, it is characterized in that: described rapid hardening lotion slurries (4) are configured in mass ratio and are formed by water, cement, anchoring additive, accelerating admixture, wherein the mass ratio of water and cement is 0.25 ~ 0.35, the anchoring additive is 3% ~ 5% of cement amount, accelerating admixture is 2% ~ 3% of cement amount, and setting time is 30min.
3. the full anchor anchor pole of pumping lotion prestressing force/rope supporting method according to claim 1, it is characterized in that: described slow setting lotion slurries (5) are configured in mass ratio and are formed by water, cement, anchoring additive, wherein the mass ratio of water and cement is 0.25 ~ 0.35, the anchoring additive is 3% ~ 5% of cement amount, and setting time is 6 hours.
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| CN103758549A (en) * | 2014-01-09 | 2014-04-30 | 中国矿业大学 | Sequential filling-anchoring prestress full-length anchorage supporting method on basis of paste materials |
| 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 |
| CN104500115A (en) * | 2014-12-15 | 2015-04-08 | 王振伟 | Pre-stress full-length anchoring rock bolt retaining and protecting method |
| 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103758549A (en) * | 2014-01-09 | 2014-04-30 | 中国矿业大学 | Sequential filling-anchoring prestress full-length anchorage supporting method on basis of paste materials |
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| 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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| CN103147777B (en) | 2015-01-21 |
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