CN103758549A - Sequential filling-anchoring prestress full-length anchorage supporting method on basis of paste materials - Google Patents

Sequential filling-anchoring prestress full-length anchorage supporting method on basis of paste materials Download PDF

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Publication number
CN103758549A
CN103758549A CN201410010184.XA CN201410010184A CN103758549A CN 103758549 A CN103758549 A CN 103758549A CN 201410010184 A CN201410010184 A CN 201410010184A CN 103758549 A CN103758549 A CN 103758549A
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full
rope
anchor pole
anchoring
anchor
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CN201410010184.XA
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CN103758549B (en
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张农
薛飞
路抗
郑西贵
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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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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting

Abstract

The invention discloses a sequential filling-anchoring prestress full-length anchorage supporting method on the basis of paste materials. The sequential filling-anchoring prestress full-length anchorage supporting method includes utilizing paste grout and resin cartridges as anchoring agents; filing the paste grout into drilled holes, then pushing the resin cartridges to the bottoms of the drilled holes by the aid of anchor rods/ropes, and filling annular gaps among the anchor rods/ropes and the drilled holes by paste grout squeezed out of the drilled holes; starting anchor rod drilling machines to stir the resin cartridges at the bottoms of the drilled holes, sequentially arranging support plates, arched spheres, anti-friction pressurizing gaskets and driving nuts on exposed sections of the anchor rods/ropes, and stretching and drawing the exposed sections of the anchor rods/ropes by the aid of torque wrenches or stretch-draw instruments to exert prestress on the exposed sections of the anchor rods/ropes. A full-length anchorage effect can be realized after the paste grout is solidified. The sequential filling-anchoring prestress full-length anchorage supporting method has the advantages that the prestress is organically combined with the full-length anchorage effect, so that a supporting effect for soft rock roadways in deep wells can be improved; a construction process is simple without working procedures for grout spraying, hole sealing and the like, and the sequential filling-anchoring prestress full-length anchorage supporting method can be widely applied to reinforcing for coal and rock roadways of deep mines and other rock reinforcing engineering.

Description

Anchor prestressing force full-length anchorage support method after a kind of first filling based on ointment material
Technical field
The present invention relates to control and the support technology of coal mine roadway country rock, specifically anchor prestressing force full-length anchorage support method after a kind of first filling based on ointment material that is applicable to Deep Soft Rock Tunnel.
Background technology
Prestressing force full length fastening technology is the novel reliability Roadway Support Technology growing up on common bolt support technology basis, because it can apply larger prestressing force, roadway surrounding rock is played to active support effect, occupies critical role in coal roadway support.Anchor pole/the rope of full length fastening, Anchor Agent is bonded together anchor pole/rope body of rod and borehole wall, has effectively improved the rigidity of anchor pole/rope support system.During full length fastening, ess-strain is inhomogeneous along rock-bolt length direction distributed pole, makes the body of rod very sensitive to surrouding rock deformation and absciss layer, can suppress in time absciss layer and slip.During full length fastening, the stress of anchor pole is good, offers within the scope of anchoring the Support Resistance of country rock large, thus can greatly increase aspect and plane of weakness C, value; In addition, full length fastening not only can make anchor pole have higher anchored force, and makes anchor pole have certain shear resistance; Thereby at large section, geological structure, destroy that location, top board are weak and thicker, high-ground stress etc. is difficult, in complicated tunnel, become the important means that tunnel adds strong supporting.
The key of prestressing force full length fastening technology is that anchor pole/rope, Anchor Agent, hole wall are bonded as to an organic whole, jointly suppresses the distortion of roadway surrounding rock.The solidification shrinkage characteristic that traditional cement paste base Anchor Agent has due to itself, makes Anchor Agent can not be full of boring, thereby does not reach full length fastening object.And along with coal in China exploitation is towards the development of depth & wideth, be faced with Deep Soft Rock Tunnel high-ground stress, large deformation, be subject to the problems such as mining influence is violent.Prestressing force full length fastening technology with its high reliability, the advantage such as with low cost, construction technology is simple and more and more come into one's own, becomes roadway support preferred option.
At present, the full length fastening technology of application comparative maturity is mainly hollow grouting anchor/rope, and its advantage is to adopt traditional cement grout as Anchor Agent, and preparation is simple, cheap.But there is the problems such as sealing of hole difficulty, easy running pulp spillage in the method, simultaneously for slip casting facilitates general cement grout water/binder ratio larger, is difficult to meet the requirement of roadway with large deformation to Anchor Agent intensity.Publication number be CN10194929A's " a kind of prestressing force full length fastening support technology " adopt speed cured resin powder stick group technology, its advantage is to make anchor pole/rope very sensitive to surrounding rock separation layer distortion, can suppress in time surrounding rock separation layer and slip, reduce anchor pole/rope support density.But it is larger that the method requires anchor pole/rope jacking force, in construction, be difficult at the scene implement.
Summary of the invention
Technical problem: the object of the invention is to overcome weak point of the prior art, anchor prestressing force full-length anchorage support method after a kind of simple, easily construction, the effective first filling based on ointment material is provided.
Technical scheme: anchor prestressing force full-length anchorage support method after the first filling based on ointment material of the present invention, comprises construction drill (6), clear hole on the scar of tunnel, on-the-spot preparation lotion slurries (9); Its step is as follows:
A, according to formula: calculate the required lotion slurries of anchoring injection rate,
In formula: V-resin explosive roll volume, D 2-bore diameter, D 1-anchor pole/rope diameter;
B, by flow meter keyhole lotion slurries injection rate, first in the boring on the scar of described tunnel, insert the flexible pipe being connected with grouting pump, until the bottom of deeply holing, then open grouting pump, by flexible pipe, in boring, inject lotion slurries, marginal not enters limit slowly to be extracted flexible pipe out, so that lotion slurries fill up the space forming after flexible pipe is extracted out;
C, with anchor pole/rope, resin explosive roll is pushed in the boring that is marked with lotion slurries, the lotion slurries that extruding is gone out are filled in anchor pole/rope annulus around, opening the resin explosive roll of jumbolter at the bottom of to hole stirs, during stirring, while pushing away, stir, after stirring and anchor pole/rope being pushed at the bottom of hole after 30 seconds, stir again after 5 seconds and stop stirring, at the revealed section of anchor pole/rope, load onto successively supporting plate, vaulted spheroid, antifriction pressure energizing gasket, drive nut;
D, with torque wrench or stretch-draw instrument, anchor pole/rope revealed section is carried out to stretch-draw and apply pretightning force, after lotion slurries solidify 6 hours, complete full length fastening supporting.
Described lotion slurries are formulated in mass ratio by water, cement, anchoring additive, and wherein the mass ratio of water and cement is 0.25~0.35, and anchoring additive is cement amount 3%~5%.
Beneficial effect: the present invention adopts resin explosive roll and lotion slurries as Anchor Agent, resin explosive roll carries out end anchorage, apply after pretightning force, after solidifying, lotion slurries form full length fastening, there is adhesion strength high, quick solidifying, security reliability advantages of higher, lotion injection slurry has good thixotropy and mobility, its Marsh funnel viscosity value can reach 50s left and right, can not there is not stream pendant phenomenon because of gravity effect, can effectively avoid ordinary Portland cement slurries easily to run problem leakage, adoption of innovation is first filled with rear anchor technique, guarantee that Anchor Agent is full of boring, reach full length fastening object, anchor pole/rope is applied to pretightning force simultaneously, so just pretightning force and full length fastening are organically combined, effectively improved anchor pole/rope support system rigidity, significantly improved the control effect of anchor pole/rope to surrouding rock deformation, especially to coal road crosspoint, fault zone, the tunnel that zone of fracture is subject to mining influence to be difficult to supporting has good supporting effect.
Accompanying drawing explanation
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-supporting plate, the vaulted spheroid of 3-, 4-antifriction packing ring, 5-drive nut, 6-boring, 7-resin explosive roll, 8-anchor pole/rope, 9-lotion slurries, 10-flexible pipe.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described:
Embodiment 1,
(1) by water and cement ratio, be 0.25 to mix slurry preparation lotion slurries 9: get 2000 grams of cement, 500 grams, water, 60 grams of the FLOWCABLE anchoring additives of being produced by BASF AG, prepare lotion slurries 9 after stirring completely;
(2) at tunnel scar 1 construction drill 6, bore diameter is 28mm, and drilling depth is 2200mm, and clear hole;
(3) according to formula calculate the required lotion slurries of anchoring injection rate; V-Anchor Agent volume in formula; D 2-bore diameter; D 1-anchor pole/rope diameter;
Getting bore diameter is 28mm, and anchor pole/rope diameter is 22mm, and resin anchoring agent diameter is 23mm, and length is 350mm; By above-mentioned formula, calculating required lotion slurries is 0.37L.
(4) by internal diameter, be that 15mm external diameter is the bottom that the flexible pipe 10 of 22mm inserts boring 6, open grouting pump, the lotion slurries that configure 9, by flexible pipe 10 injection holes 6, are controlled to injection rate by the metering device on grouting pump; Inject lotion slurries while flexible pipe 10 is slowly extracted out, make lotion slurries 9 fill up the space of extracting flexible pipe 10 out;
(5) by diameter, be 23mm, length is that the resin explosive roll 7 use diameters of 350mm are that 22mm length is that anchor pole/rope 8 of 2200mm pushes boring 6 bottoms, the lotion slurries 10 of outwards extruding are filled in the annular space between anchor pole/rope 8 and boring 6, start jumbolter and drive anchor pole/rope 8 agitating resin powder sticks 7, during stirring, note stirring while pushing away (stirring 30 seconds), anchor pole 8/ rope is pushed into behind boring 6 bottoms, stir again about 5 seconds, then stop stirring, revealed section at anchor pole/rope 8 installs supporting plate 2 according to a conventional method successively, vaulted spheroid 3, antifriction pressure energizing gasket 4, drive nut 5,
(6) use stretch-draw jack to carry out stretch-draw pretension to anchor pole/rope 8, in anchor pole/rope 8 length range, apply pretightning force, finally after lotion slurries 9 solidify 6 hours, form full length fastening.
Embodiment 2,
Substantially the same manner as Example 1, something in common slightly.Difference: be 0.3 to mix slurry configuration slow setting lotion slurries 10 by water and cement ratio: get again 2000 grams of cement, 600 grams, water, 60 grams of the FLOWCABLE anchoring additives of being produced by BASF AG, obtain required lotion slurries 9 after stirring completely.
Embodiment 3,
Substantially the same manner as Example 1, something in common slightly.Difference: be 0.35 to mix slurry configuration lotion slurries 10 by water/binder ratio: get 2000 grams of cement, 700 grams, water, 60 grams of the FLOWCABLE anchoring additives of being produced by BASF AG, obtain required lotion slurries 9 after stirring completely.

Claims (2)

1. an anchor prestressing force full-length anchorage support method after the first filling based on ointment material, comprises the upper construction drill (6) of tunnel scar (1), clear hole, on-the-spot preparation lotion slurries (9); It is characterized in that:
A, according to formula: calculate the required lotion slurries of anchoring injection rate,
In formula: V-resin explosive roll volume, D 2-bore diameter, D 1-anchor pole/rope diameter;
B, by flow meter control, calculate the required lotion slurries injection rate of boring, first in the boring (6) on described tunnel scar (1), insert the flexible pipe (10) being connected with grouting pump, the bottom of (6) until deeply hole, then open grouting pump, by flexible pipe (10), in boring (6), inject lotion slurries (9), marginal not enters limit slowly to be extracted flexible pipe (10) out, so that lotion slurries (9) fill up the space forming after flexible pipe (10) is extracted out;
C, resin explosive roll (7) is pushed in the boring that is marked with lotion slurries (9) with anchor pole/rope (8), the lotion slurries (9) of going out that are squeezed are filled in anchor pole/rope (8) annulus around, opening the resin explosive roll (7) of jumbolter at the bottom of to hole stirs, during stirring, while pushing away, stir, after stirring and anchor pole/rope (8) being pushed at the bottom of hole after 30 seconds, stir again after 5 seconds and stop stirring, at the revealed section of anchor pole/rope (8), load onto successively supporting plate (2), vaulted spheroid (3), antifriction pressure energizing gasket (4), drive nut (5);
D, with torque wrench or stretch-draw instrument, anchor pole/rope (8) revealed section is carried out to stretch-draw and apply pretightning force, after lotion slurries (9) solidify 6 hours, complete full length fastening supporting.
2. anchor prestressing force full-length anchorage support method after the first filling based on ointment material according to claim 1, it is characterized in that: described lotion slurries (9) are formulated in mass ratio by water, cement, anchoring additive, wherein the mass ratio of water and cement is 0.25~0.35, and anchoring additive is cement amount 3%~5%.
CN201410010184.XA 2014-01-09 2014-01-09 Anchor prestressing force full-length anchorage support method after a kind of first filling based on ointment material Active CN103758549B (en)

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PCT/CN2014/082187 WO2015103862A1 (en) 2014-01-09 2014-07-15 Method for supporting by means of full-length pre-stressed anchorage with paste material being first poured and last anchored

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104500115A (en) * 2014-12-15 2015-04-08 王振伟 Pre-stress full-length anchoring rock bolt retaining and protecting method
WO2015103862A1 (en) * 2014-01-09 2015-07-16 中国矿业大学 Method for supporting by means of full-length pre-stressed anchorage with paste material being first poured and last anchored
CN107013238A (en) * 2017-03-20 2017-08-04 化工部长沙设计研究院 Resin mortar combined bolt support structure and its construction method
CN111927514A (en) * 2020-08-03 2020-11-13 中国矿业大学 Prestress full-length anchoring system and method based on steel grit adding in post-grouting method

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CN103410543A (en) * 2013-08-13 2013-11-27 中国矿业大学 Pressure yielding internally-grouted anchor cable

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CN86107237A (en) * 1985-11-07 1987-05-27 欧伊坦佩尔拉公司 Concrete is poured into a kind of method and apparatus in the boring of rock bolting
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015103862A1 (en) * 2014-01-09 2015-07-16 中国矿业大学 Method for supporting by means of full-length pre-stressed anchorage with paste material being first poured and last anchored
CN104500115A (en) * 2014-12-15 2015-04-08 王振伟 Pre-stress full-length anchoring rock bolt retaining and protecting method
CN107013238A (en) * 2017-03-20 2017-08-04 化工部长沙设计研究院 Resin mortar combined bolt support structure and its construction method
CN111927514A (en) * 2020-08-03 2020-11-13 中国矿业大学 Prestress full-length anchoring system and method based on steel grit adding in post-grouting method

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WO2015103862A1 (en) 2015-07-16

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