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