CN102226405B - Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable - Google Patents

Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable Download PDF

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Publication number
CN102226405B
CN102226405B CN 201110135737 CN201110135737A CN102226405B CN 102226405 B CN102226405 B CN 102226405B CN 201110135737 CN201110135737 CN 201110135737 CN 201110135737 A CN201110135737 A CN 201110135737A CN 102226405 B CN102226405 B CN 102226405B
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China
Prior art keywords
anchor cable
grouting
coal
cable
boring
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CN 201110135737
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Chinese (zh)
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CN102226405A (en
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宋彦波
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河北同成科技股份有限公司
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Abstract

The invention discloses a method for reinforcing a working surface of a loose and soft coal bed by utilizing a nonmetal grouting anchor cable. The grouting anchor cable is made of a high-strength composite material carbon fiber/glass fiber. The reinforcement of the working surface of the loose and soft coal bed is realized through the processes of surveying and lofting, drilling holes in a coal body, manufacturing and arranging the grouting anchor cable, sealing an anchor cable hole, and grouting chemical grout in the hole and the like. As the grouting anchor cable is made of nonmetal materials, no sparks are generated when a coal-winning machine cuts, and the grouting anchor cable has the characteristics of flame retardancy, anti-static electricity, safety and reliability in use and high tensile strength, higher breaking force, light weight, and capability of being bent and coiled, and is higher than steel and convenient in transportation; and by utilizing the method, deep hole reinforcement and support on the working face can be carried out under the condition that the coal face can not be supported by using a metal anchor cable, the grouting support operation can be carried out on the working surface on site by combining a chemical grouting method, and the coal body of the working surface can be reinforced at the upper and lower tunnels of the working face by combining the chemical grouting in advance.

Description

A kind of method of the weak seam work plane being reinforced with Non-metal grouting anchor cable
Technical field
The present invention relates to the method, particularly a kind of method of coal-face under the soft and broken surrounding rocks condition being reinforced in advance with Non-metal grouting anchor cable of with grouting cable anchor the weak seam work plane being reinforced under a kind of mine in exploitation process.
Background technology
At present, along with the superficial part coal resources reduce day by day, in succession enter the resource deep mining, because the increase of the coal mining degree of depth and geostatic stress, make increasing coal mine work area be in the soft and broken surrounding rocks state, wall caving, roof fall appear in work plane easily in exploitation process, even cause work plane to stop production, according to statistics, because causing work plane, working face wall wall caving or roof collapse stop production, its off-time can reach 40%~60% of total off-time, and China has 18% fully-mechanized mining working to be trapped in the low yield state because the Surrounding Rock Control state is undesirable every year approximately.Current domestic normal employing solves work plane wall caving roof fall problem with chemical grouting in conjunction with the method for metal bolt support in working surface hydraulic support, but the method cost is high, control range is little, and when coal-winning machine cutting coal body, can run into anchor metal unavoidably, be easy to produce spark, blast, cause potential safety hazard, in addition, because anchor metal or anchor cable all have higher shear strength, damage easily coal winning machine cutting bit.
Summary of the invention
Technical problem to be solved by this invention is to overcome existingly with anchor metal, anchor cable soft and broken surrounding rocks to be carried out the drawback of reinforcement means, and provide a kind of and can guarantee when coal-winning machine cutting coal body, not produce that spark, flame-retardant and anti-static, tensile strength highly, lightweight, flexible are coiled, convenient transportation, safe and reliable a kind ofly with Non-metal grouting anchor cable the weak seam work plane is reinforced, to the breaking surrounding rock condition under the coal-face method of in exploitation process, reinforcing in advance.
The present invention solves the technical scheme that its technical problem takes: this method of the weak seam work plane being reinforced with Non-metal grouting anchor cable is characterized in: it is undertaken by following five steps:
A, at first loose coal is surveyed, according to the degree of depth of the Thickness Design boring of loose coal, then measured setting-out, implement bore operation, finish boring;
B, make the corresponding length grouting cable anchor according to drilling depth, and it is inserted in the boring;
C, between downward 0.5~1 meter of distance drilling orifice hole sealing device is set, it is made of the rope made of hemp, cotton and other braids, then injects chemical grout in it, chemical grout at the hole sealing device internal reaction, expand, solidify, to port closing;
D, finish sealing of hole after, with slip casting facility pressure injection chemical slip casting material, chemical slip casting material is full of boring to the Grouting Pipe by grouting cable anchor in the boring, and spread in the crack in loose coal, solidify to chemical slip casting material, grouting cable anchor is contained to live, become one;
E, such as need anchor cable is applied prestressing force, the anchor cable tail end is unloaded, expose anchor cable and carry out stretch-draw, to designing the anchoring value, finish reinforcing.
The present invention solves another technical scheme that its technical problem takes: this method of the weak seam work plane being reinforced with Non-metal grouting anchor cable, be characterized in: described when with Non-metal grouting anchor cable loose coal being reinforced, its layout has dual mode:
A, work plane are directly reinforced loose coal;
B, from crossheading side up and down loose coal is reinforced.
The present invention solves the technical scheme that its technical problem takes: the Non-metal grouting anchor cable of this method for the weak seam work plane is reinforced, include guiding cap, be characterized in: it also includes anchor cable, Grouting Pipe, slurry outlet, the Grouting Pipe joint, the anchor cable tail end, anchor cable forms a branch of being arranged in the Grouting Pipe by three, the Grouting Pipe tube wall is provided with a plurality of slurry outlets, and the evenly distribution that becomes to interlock, Grouting Pipe one end is provided with guiding cap, the other end is provided with the Grouting Pipe joint, the Grouting Pipe joint links to each other with the anchor cable tail end, the anchor cable tail end is provided with screw thread, links to each other with the slurry filling machine pipeline by screw thread.
The present invention solves the another technical scheme that its technical problem takes: the Non-metal grouting anchor cable of this method for the weak seam work plane is reinforced is characterized in: described anchor cable is made with carbon fibre of composite material/glass fiber.
The present invention solves another technical scheme that its technical problem takes: the Non-metal grouting anchor cable of this method for the weak seam work plane is reinforced is characterized in: described Grouting Pipe is made with aluminium plastic material.
This method of the weak seam work plane being reinforced with Non-metal grouting anchor cable provided by the present invention, grouting cable anchor is to make with the high strength composite carbon fibers/fiberglass, owing to adopt non-metallic material, do not produce spark during the coal-winning machine cutting, fire-retardant, antistatic, safe and reliable, tensile strength is high, be higher than steel, higher Fracture Force is arranged, lightweight, be 1/4th of unidimensional steel weight, bend radius is 1 meter, flexible coiling, convenient transportation has realized that can not use the metal anchor cable to carry out in the situation of supporting work plane being carried out deep hole at coal-face reinforces and supporting, not only can carry out the grouting support operation in conjunction with the chemical grouting method at the work plane scene, and can reinforce in advance the work plane coal body in conjunction with chemical grouting in the lane up and down at work plane.
Description of drawings
Fig. 1 directly carries out the structural representation of reinforcement means for what the embodiment of the invention provided with Non-metal grouting anchor cable to the weak seam work plane.
Fig. 2 carries out the structural representation of reinforcement means for what the embodiment of the invention provided with Non-metal grouting anchor cable from crossheading side up and down to the weak seam work plane.
One of employed Non-metal grouting anchor cable structural representation of method of the weak seam work plane being reinforced with Non-metal grouting anchor cable that Fig. 3 provides for the embodiment of the invention.
Two of the employed Non-metal grouting anchor cable structural representation of method of the weak seam work plane being reinforced with Non-metal grouting anchor cable that Fig. 4 provides for the embodiment of the invention.
The specific embodiment
With reference to Fig. 1~4, this method of the weak seam work plane being reinforced with Non-metal grouting anchor cable that the embodiment of the invention provides, it is undertaken by following five steps:
A, at first loose coal 1 is surveyed, according to the degree of depth of the Thickness Design boring 2 of loose coal 1, then measured setting-out, implement bore operation, finish boring 2;
B, make corresponding length grouting cable anchor 3 according to boring 2 degree of depth, and it is inserted in the boring 2;
C, apart between downward 0.5~1 meter of 2 apertures of boring hole sealing device 4 is being set, it is made of the rope made of hemp, cotton and other braids, then injects chemical grout in it, chemical grout at hole sealing device 4 internal reactions, expand, solidify, to port closing;
D, finish sealing of hole after, the Grouting Pipe 8 by grouting cable anchor 3 is interior with slip casting facility pressure injection chemical slip casting materials 5 to boring 2, chemical slip casting material 5 is full of boring 2, and spread in the crack in loose coal 1, solidify to chemical slip casting material 5, grouting cable anchor 3 is contained to live, become one;
E, such as need anchor cable is applied prestressing force, anchor cable tail end 11 is unloaded, expose anchor cable 7 and carry out stretch-draw, to designing the anchoring value, finish reinforcing.
Described when reinforcing with 3 pairs of loose coals 1 of Non-metal grouting anchor cable, its layout has dual mode:
A, work plane are directly reinforced loose coal 1;
B, from crossheading side up and down loose coal 1 is reinforced.
Described Non-metal grouting anchor cable 3 includes guiding cap 6, anchor cable 7, Grouting Pipe 8, slurry outlet 9, Grouting Pipe joint 10, anchor cable tail end 11, anchor cable 7 usefulness high strength composite carbon fibers/fiberglass are made, form a branch of being arranged in the Grouting Pipe 8 by three, Grouting Pipe 8 tube walls are provided with a plurality of slurry outlets 9, and the evenly distribution that becomes to interlock, Grouting Pipe 8 usefulness aluminium plastic materials are made, Grouting Pipe 8 one ends are provided with guiding cap 6, the other end is provided with Grouting Pipe joint 10, Grouting Pipe joint 10 links to each other with anchor cable tail end 11, anchor cable tail end 11 is provided with screw thread 12, links to each other with the slurry filling machine pipeline by screw thread 12.
Described chemical grout is ripple thunder sound, it is that effluent north is with becoming the development of mining industry Science and Technology Ltd., these slurries have higher mechanical performance, with the rock stratum preferably affinity is arranged, the flexility of induration bears certain stratum deformation, after material injected the rock stratum, low viscosity mixtures kept several seconds, penetrated into tiny crack and expanded; This product has been done evaluation in 2005, at the beginning of 2006 beginning for sale, be applied under the coal mine, its ripple thunder sound chemical grout performance indications are as follows:
1. emulsification times 10~15S
2. time 50~60S does not touch with one's hand
3. induration density 400~1250Kg/m 3
4. compressive strength 30~50MPa
5. the fire-retardant oxygen index (OI) of fire resistance is greater than 26%
6. adhesive strength 30~50MPa
7. serum density 1200Kg/m 3
8. slurry viscosity 225~300mPa.S
9. the biliquid mixing ratio is 1: 1
10. expansion multiple 1~3

Claims (5)

1. method of the weak seam work plane being reinforced with Non-metal grouting anchor cable, it is characterized in that: it is undertaken by following five steps:
A, at first loose coal (1) is surveyed, according to the degree of depth of the Thickness Design boring (2) of loose coal (1), then measured setting-out, implement bore operation, finish boring (2);
B, make corresponding length grouting cable anchor (3) according to boring (2) degree of depth, and it is inserted in the boring (2);
C, apart between downward 0.5~1 meter of (2) aperture of boring, hole sealing device (4) is being set, it is made of the rope made of hemp, cotton and other braids, then inject chemical grout in it, chemical grout at hole sealing device (4) internal reaction, expand, solidify, to port closing;
D, finish sealing of hole after, Grouting Pipe (8) by grouting cable anchor (3) is used slip casting facility pressure injection chemical slip casting materials (5) in boring (2), chemical slip casting material (5) is full of boring (2), and spread in the crack in loose coal (1), solidify to chemical slip casting material (5), grouting cable anchor (3) is contained to live, become one;
E, such as need anchor cable is applied prestressing force, anchor cable tail end (11) is unloaded, expose anchor cable (7) and carry out stretch-draw, to designing the anchoring value, finish reinforcing.
2. method of the weak seam work plane being reinforced with Non-metal grouting anchor cable according to claim 1 is characterized in that: described with Non-metal grouting anchor cable (3) to loose coal (1) when reinforcing, its layout has dual mode:
A, work plane are directly reinforced loose coal (1);
B, from crossheading side up and down loose coal (1) is reinforced.
3. Non-metal grouting anchor cable that is used for the method for claim 1, it is characterized in that: described Non-metal grouting anchor cable (3) includes guiding cap, it also includes anchor cable (7), Grouting Pipe (8), slurry outlet (9), Grouting Pipe joint (10), anchor cable tail end (11), anchor cable (7) forms a branch of being arranged in the Grouting Pipe (8) by three, Grouting Pipe (8) tube wall is provided with a plurality of slurry outlets (9), and the evenly distribution that becomes to interlock, Grouting Pipe (8) one ends are provided with guiding cap (6), the other end is provided with Grouting Pipe joint (10), Grouting Pipe joint (10) links to each other with anchor cable tail end (11), anchor cable tail end (11) is provided with screw thread (12), links to each other with the slurry filling machine pipeline by screw thread (12).
4. Non-metal grouting anchor cable according to claim 3, it is characterized in that: described anchor cable (7) is made with carbon fibre of composite material/glass fiber.
5. Non-metal grouting anchor cable according to claim 3, it is characterized in that: described Grouting Pipe (8) is made with aluminium plastic material.
CN 201110135737 2011-05-25 2011-05-25 Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable CN102226405B (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635327B (en) * 2012-04-01 2015-04-22 天地科技股份有限公司 Grouting method and system of cracked coal rock mass
CN102852532B (en) * 2012-10-09 2015-06-17 冀中能源股份有限公司东庞矿 Grouting method for preventing rib walk caving
CN103174444B (en) * 2013-02-26 2014-12-10 中国矿业大学(北京) Support method and support structure for soft coal/ rock stratum alley
CN103244157B (en) * 2013-05-24 2015-04-22 焦作煤业(集团)新乡能源有限公司 Spalling prevention method through full-length anchoring of rib with soft bolt
CN103352711A (en) * 2013-05-31 2013-10-16 淮北市平远软岩支护工程技术有限公司 Method for consolidating rock coal body through deeply sealed holes and naked grouting cementing
CN110159305B (en) * 2019-04-12 2020-10-20 平顶山天安煤业股份有限公司 Method for optimizing coal wall grouting parameters of composite roof working surface with large mining depth and large mining height

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