CN102226405A - Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable - Google Patents

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

The method that the nonmetal grouting cable anchor of a kind of usefulness is reinforced the weak seam work plane

Technical field

The present invention relates to the method for with grouting cable anchor the weak seam work plane being reinforced under a kind of mine, the method that the nonmetal grouting cable anchor of particularly a kind of usefulness is reinforced in exploitation process in advance to coal-face under the soft broken wall rock condition.

Background technology

At present, along with the superficial part coal resources reduce day by day, enter the resource deep mining in succession, because the increase of the coal mining degree of depth and geostatic stress, make increasing coal mine work area be in soft broken country rock state, wall caving, roof fall appear in work plane easily in exploitation process, even cause work plane to stop production, according to statistics, because of 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 of 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 this method cost height, control range are 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 coal winning machine cutting bit easily.

Summary of the invention

Technical problem to be solved by this invention is to overcome existingly with anchor metal, anchor cable the soft broken country rock 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 spark, flame-retardant and anti-static, tensile strength height, in light weight, flexiblely coil, convenient transportation, the safe and reliable nonmetal grouting cable anchor of a kind of usefulness are reinforced the weak seam work plane, 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: the method that the nonmetal grouting cable anchor of this usefulness is reinforced the weak seam work plane is characterized in that: it can be undertaken by following five steps:

A, at first loose coal is surveyed,, then measured setting-out, implement bore operation, finish boring according to the degree of depth of the Thickness Design boring of loose coal;

B, make the respective length grouting cable anchor, and it is inserted in the boring according to drilling depth;

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, injects chemical grout then in it, chemical grout at the hole sealing device internal reaction, expand, solidify, to port closing;

D, finish sealing of hole after, the Grouting Pipe by grouting cable anchor is usefulness slip casting facility pressure injection chemical slip casting material in boring, chemical slip casting material is full of 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, anchor cable is applied prestressing force, the anchor cable tail end can be unloaded, expose anchor cable and carry out stretch-draw,, finish reinforcing to designing the anchoring value as need.

The present invention solves another technical scheme that its technical problem takes: the method that the nonmetal grouting cable anchor of this usefulness is reinforced the weak seam work plane, be characterized in: when the nonmetal grouting cable anchor of described usefulness was reinforced loose coal, its layout had dual mode:

A, work plane are directly reinforced loose coal;

B, loose coal is reinforced from crossheading side up and down.

The present invention solves the technical scheme that its technical problem takes: the employed equipment of method that the nonmetal grouting cable anchor of this usefulness is reinforced the weak seam work plane, described nonmetal grouting cable anchor includes 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 is formed 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 employed equipment of method that the nonmetal grouting cable anchor of this usefulness is reinforced the weak seam work plane, be 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 employed equipment of method that the nonmetal grouting cable anchor of this usefulness is reinforced the weak seam work plane, be characterized in: described Grouting Pipe is made with aluminium plastic material.

The method that the nonmetal grouting cable anchor of this usefulness provided by the present invention is reinforced the weak seam work plane, 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, the tensile strength height, be higher than steel, higher Fracture Force is arranged, in light weight, 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 under 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, and can reinforce in advance the work plane coal body in conjunction with chemical grouting in the lane up and down at work plane at the work plane scene.

Description of drawings

Fig. 1 directly carries out the structural representation of reinforcement means to the weak seam work plane for the nonmetal grouting cable anchor of the usefulness that the embodiment of the invention provided.

Fig. 2 carries out the structural representation of reinforcement means from crossheading side up and down to the weak seam work plane for the nonmetal grouting cable anchor of the usefulness that the embodiment of the invention provided.

One of employed nonmetal grouting cable anchor structural representation of method that Fig. 3 reinforces the weak seam work plane for the nonmetal grouting cable anchor of the usefulness that the embodiment of the invention provided.

Two of the employed nonmetal grouting cable anchor structural representation of method that Fig. 4 reinforces the weak seam work plane for the nonmetal grouting cable anchor of the usefulness that the embodiment of the invention provided.

The specific embodiment

With reference to Fig. 1～4, the method that the nonmetal grouting cable anchor of this usefulness that the embodiment of the invention provided is reinforced the weak seam work plane, it can be undertaken by following five steps:

A, at first loose coal 1 is surveyed,, then measured setting-out, implement bore operation, finish boring 2 according to the degree of depth of the Thickness Design boring 2 of loose coal 1;

B, make respective length grouting cable anchor 3, and it is inserted in the boring 2 according to boring 2 degree of depth;

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, injects chemical grout then in it, chemical grout at hole sealing device 4 internal reactions, expand, solidify, to port closing;

D, finish sealing of hole after, with slip casting facility pressure injection chemical slip casting material 5, chemical slip casting material 5 is full of holes 2 to the Grouting Pipe 8 by grouting cable anchor 3 in 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, anchor cable is applied prestressing force, anchorcable tail end 11 can be unloaded, exposeanchor cable 7 and carry out stretch-draw,, finish reinforcing to designing the anchoring value as need.

When 3 pairs of loose coals 1 of the nonmetal grouting cable anchor of described usefulness were reinforced, its layout had dual mode:

A, work plane are directly reinforced loose coal 1;

B, loose coal 1 is reinforced from crossheading side up and down.

Described nonmetal grouting cable anchor 3 includes guiding cap 6,anchor cable 7, GroutingPipe 8, slurry outlet 9, GroutingPipe joint 10, anchorcable tail end 11,anchor cable 7 usefulness high strength composite carbon fibers/fiberglass are made, form a branch of being arranged in the GroutingPipe 8 by three, GroutingPipe 8 tube walls are provided with a plurality of slurry outlets 9, and the evenly distribution that becomes to interlock, GroutingPipe 8 usefulness aluminium plastic materials are made, GroutingPipe 8 one ends are provided with guiding cap 6, the other end is provided with GroutingPipe joint 10, GroutingPipe joint 10 links to each other with anchorcable tail end 11, anchorcable tail end 11 is provided withscrew thread 12, links to each other with the slurry filling machine pipeline byscrew thread 12.

Described chemical grout is a 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 properties, with the rock stratum affinity is preferably 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/m³

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/m³

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 nonmetal grouting cable anchor, it is characterized in that: it can be undertaken by following five steps:

A, at first loose coal (1) is surveyed,, then measured setting-out, implement bore operation, finish boring (2) according to the degree of depth of the Thickness Design boring (2) of loose coal (1);

B, make respective length grouting cable anchor (3), and it is inserted in the boring (2) according to boring (2) degree of depth;

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, injects chemical grout then 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, anchor cable is applied prestressing force, anchor cable tail end (11) can be unloaded, expose anchor cable (7) and carry out stretch-draw,, finish reinforcing to designing the anchoring value as need.

2. the method that the nonmetal grouting cable anchor of usefulness according to claim 1 is reinforced the weak seam work plane is characterized in that: when reinforcing, its layout has dual mode to the nonmetal grouting cable anchor of described usefulness (3) to loose coal (1):

A, work plane are directly reinforced loose coal (1);

B, loose coal (1) is reinforced from crossheading side up and down.

3. for implementing the employed equipment of method step of claim 1, it is characterized in that: described nonmetal grouting cable anchor (3) includes guiding cap, it is characterized in that: it also includes anchor cable (7), Grouting Pipe (8), slurry outlet (9), Grouting Pipe joint (10), anchor cable tail end (11), anchor cable (7) is formed 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. the equipment of the method for the weak seam work plane being reinforced with nonmetal grouting cable anchor according to claim 3, it is characterized in that: described anchor cable (7) is made with carbon fibre of composite material/glass fiber.

5. the equipment of the method for the weak seam work plane being reinforced with grouting cable anchor according to claim 3, it is characterized in that: described Grouting Pipe (8) is made with aluminium plastic material.

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