CN110644995A - Top coal caving pre-splitting section, pre-splitting device and method based on hard and thick coal seam of coal mine - Google Patents

Top coal caving pre-splitting section, pre-splitting device and method based on hard and thick coal seam of coal mine Download PDF

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Publication number
CN110644995A
CN110644995A CN201911025566.9A CN201911025566A CN110644995A CN 110644995 A CN110644995 A CN 110644995A CN 201911025566 A CN201911025566 A CN 201911025566A CN 110644995 A CN110644995 A CN 110644995A
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CN
China
Prior art keywords
coal
hole
splitting
transverse gap
coal seam
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Pending
Application number
CN201911025566.9A
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Chinese (zh)
Inventor
王桂利
张欣荣
郑晓晨
李宗凯
赵猛
刘文东
张洪玉
刘鹏
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SHANDONG DONGSHAN GUCHENG COAL MINE Co Ltd
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SHANDONG DONGSHAN GUCHENG COAL MINE Co Ltd
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Priority to CN201911025566.9A priority Critical patent/CN110644995A/en
Publication of CN110644995A publication Critical patent/CN110644995A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C25/00Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/60Slitting by jets of water or other liquid

Abstract

The invention relates to the field of construction of hard and thick coal seams of coal mines, in particular to a top coal caving pre-splitting section, a pre-splitting device and a method, and particularly relates to a top coal caving pre-splitting section, a pre-splitting device and a method based on the hard and thick coal seams of the coal mines, wherein the pre-splitting section comprises pre-splitting hole groups which are distributed in a branched hole manner and are arranged in the coal seams, and each pre-splitting hole group comprises a plurality of pre-splitting holes; the pre-splitting device comprises a hydraulic support, a conveyor, a drilling machine and a water flow cutting knife, wherein the hydraulic support is arranged on the top layer of the mining area, the conveyor is arranged in the mining area, the drilling machine is arranged on the conveyor, and the water flow cutting knife is arranged on the drilling machine. The method has the advantages that the emulsion drilling machine is adopted for drilling, the water drill rod is connected with the high-pressure water pump, the process of cutting the coal bed by high-pressure water flow is utilized, the treated hard coal bed is cut into layers, the requirement of easy crushing is met, the coal body crushing can be realized underground, and the top coal yield and the coal recovery rate are effectively improved.

Description

Top coal caving pre-splitting section, pre-splitting device and method based on hard and thick coal seam of coal mine
Technical Field
The invention relates to the field of construction of hard and thick coal seams of coal mines, in particular to a top coal caving pre-splitting section, a pre-splitting device and a pre-splitting method, and especially relates to a top coal caving pre-splitting section, a pre-splitting device and a pre-splitting method based on the hard and thick coal seams of the coal mines.
Background
When the hard and thick coal seam of the coal mine is excavated, a pre-splitting gap needs to be formed in the top coal caving, so that the excavation of the hard and thick coal seam of the coal mine is met. In the existing top coal caving pre-splitting section, pre-splitting device and method based on the hard and thick coal seam of the coal mine, the dead weight of a bracket and an overlying rock stratum is utilized to crush coal bodies, the crushed coal bodies have larger lumpiness, can not be completely discharged during top coal caving, and have larger coal dust; when the top coal is caving on the top coal fully mechanized caving working surface of the hard thick coal seam of the coal mine, the coal seam is hard, the lumpiness is large, the top coal caving effect is poor, and the top coal cannot be caving out; the recovery rate of coal is low, resource waste is caused, and the goaf has the left coal, so that spontaneous combustion is easy to occur, coal spontaneous combustion accidents are caused, and hidden dangers are left.
Based on the prior technical problems recorded in the background technology, the applicant makes the following invention designs of a top coal caving pre-splitting section, a pre-splitting device and a method based on a hard and thick coal seam of a coal mine.
Disclosure of Invention
The invention aims to provide a top coal caving pre-splitting section based on a hard and thick coal seam of a coal mine,
the invention aims to provide a top coal caving presplitting device based on a hard and thick coal seam of a coal mine,
the invention aims to provide a top coal caving pre-splitting section pre-splitting method based on a hard and thick coal seam of a coal mine.
The invention provides a top coal caving pre-splitting section, a pre-splitting device and a method based on a hard and thick coal seam of a coal mine for solving one of the technical problems, and aims to improve the top coal caving effect and reduce the volume of a coal briquette; the adopted technical scheme is as follows: the utility model provides a caving coal presplitting section based on hard thick coal seam in colliery, includes to be the branch hole distribution and set up the presplitting punch combination in coal seam (1), the presplitting punch combination contains a plurality of presplitting hole (4).
Because the pre-splitting hole group is designed, a cracking section is formed in the coal seam between the goaf, the coal seam roof and the excavation area through the pre-splitting hole group, and the coal body is not crushed by the dead weight of the bracket and the overlying rock stratum, so that the top coal caving effect is improved, and the volume of the coal block is reduced.
Preferably, the branching holes of the pre-split hole set are integrated in such a way that a pre-set fracture profile is formed in the coal seam (1).
Preferably, the pre-split holes (4) are arranged in the coal seam (1) corresponding to the goaf (2), and the pre-split holes (4) are arranged to extend from the mining area (5) to the coal seam roof (3).
Preferably, the included angle alpha between the central line of the pre-cracking holes (4) and the vertical line of the coal seam (1) is set to be 8-17 degrees, and the pre-cracking holes (4) are arranged to be distributed at intervals along the vertical plane of the coal seam (1).
Preferably, the pre-split hole (4) is provided to include a hole body (40), a first transverse slit body (41), a second transverse slit body (42), a third transverse slit body (43), a fourth transverse slit body (44), a fifth transverse slit body (45), and a sixth transverse slit body (46), and the hole body (40) is provided to communicate with the first transverse slit body (41), the second transverse slit body (42), the third transverse slit body (43), the fourth transverse slit body (44), the fifth transverse slit body (45), and the sixth transverse slit body (46), respectively, the first transverse slit body (41), the second transverse slit body (42), the third transverse slit body (43), the fourth transverse slit body (44), the fifth transverse slit body (45), and the sixth transverse slit body (46) are provided at side surfaces of the hole body (40), and the first transverse slit body (41), the second transverse slit body (42), the third transverse slit body (43), the third, The fourth transverse gap body (44), the fifth transverse gap body (45) and the sixth transverse gap body (46) are arranged and distributed at intervals along the central line of the hole body (40), the hole body (40) is a circular hole body, and the first transverse gap body (41), the second transverse gap body (42), the third transverse gap body (43), the fourth transverse gap body (44), the fifth transverse gap body (45) and the sixth transverse gap body (46) are respectively arranged into a slit body.
The utility model provides a caving coal presplitting section's presplitting device based on hard thick coal seam in colliery includes hydraulic support (6), conveyer (7), rig (8) and rivers cutting knife (9), is provided with on the top layer of mining area (5) hydraulic support (6) are provided with in mining area (5) conveyer (7), rig (8) set up on conveyer (7), rivers cutting knife (9) are installed and are set up on rig (8).
Preferably, the hydraulic support (6) is arranged as a forepoling hydraulic support, the hydraulic support (6) being arranged in a mining area (5);
preferably, the conveyor (7) is arranged as a scraper conveyor, the conveyor (7) is arranged to extend between the mining area (5) and the goaf (2), and the conveyor (7) is connected with the drilling machine (8);
preferably, the drilling machine (8) is arranged as an emulsion drilling machine, and the base of the drilling machine (8) is connected with the conveyor (7);
preferably, a water spraying hole body (92) is arranged on the side surface of the upper end of the rod part (91) of the water flow cutting knife (9), a cutting edge is arranged on the upper end of the rod part (91), a channel hole is formed in the rod part (91) and is communicated with the water spraying hole body (92), the rod part (91) is a rod-shaped body with a blind hole, and the water spraying hole body (92) is a flat hole body.
Preferably, the hydraulic support (6), the drilling machine (8) and the water flow cutting knife (9) are distributed in a mode of forming a forked hole body, and the hydraulic support (6), the drilling machine (8), the water flow cutting knife (9) and the conveyor (7) are distributed in a mode of conveying carriers.
A pre-vertical cracking method for a top coal caving pre-cracking section based on a hard thick coal seam of a coal mine comprises the following steps:
s1, supporting a hydraulic support (6) on a mining area (5), placing a drilling machine (8) on a conveyor (7), installing the drilling machine (8) at a pre-splitting operation point through the conveyor (7), installing a coal seam drill rod on the drilling machine (8), setting an included angle alpha between a center line of the coal seam drill rod and a vertical line of a coal seam (1) to be 8-17 degrees, starting the drilling machine (8), forming a hole body (40) in the coal seam (1), setting the distance between the bottom end of the hole body (40) and a coal seam roof (3) to be 800-shaped and 1100mm, drilling the hole body (40) on a vertical plane of the coal seam (1) at intervals of 1500-shaped and 1900mm,
s2, communicating the rod part (91) with a water pump, spraying the water jet through the water spraying hole body (92), putting the rod part (91) into the hole body (40) to rotate, and forming a first transverse gap body (41), a second transverse gap body (42), a third transverse gap body (43), a fourth transverse gap body (44), a fifth transverse gap body (45) and a sixth transverse gap body (46) through the water jet sprayed from the water spraying hole body (92) at intervals of 500-700mm along the central line of the hole body (40).
The method for pre-splitting the top coal caving pre-splitting section based on the hard and thick coal seam of the coal mine comprises the following steps:
a1, arranging an emulsion drilling machine on a front conveyor frame of a working face, and constructing a drill hole in the middle of a working face support towards the top inclined mining area side by using the emulsion drilling machine, wherein the drill hole is constructed to a position 1m away from the coal seam roof;
a2, conveying high-pressure water to a water conservancy cutter by a pump station through a drill rod, cutting the coal bed by the high-pressure water in the rotation process of the drilling machine, and cutting the hard coal bed into blocks;
a3, breaking the coal body by water conservancy cutting, and fully breaking the coal body by the extrusion of the self-weight stress of the overlying rock stratum and the supporting force of the bracket, thereby achieving the purpose of caving the top coal.
The invention has the beneficial effects that: the method has the advantages that the emulsion drilling machine is adopted for drilling holes, the water drilling rod is connected with the high-pressure water pump, the process of cutting the coal bed by using high-pressure water flow is utilized, the processed hard coal bed is cut into layers, the requirement of easy crushing is met, the coal body crushing can be realized underground, the top coal discharge rate and the coal recovery rate are effectively improved, the dust yield during the top coal discharge is reduced, the phenomena that the crushed coal body has large lumpiness, cannot be completely discharged during the top coal discharge and has large coal dust are prevented, and the phenomena that coal is left over in a goaf, is easy to spontaneously combust and causes coal spontaneous combustion accidents are prevented.
In the technical scheme, the pre-splitting hole group for forming the preset splitting section in the coal seam is an important technical characteristic, and has novelty, creativity and practicability in the technical field of the caving coal pre-splitting section, the pre-splitting device and the method based on the hard and thick coal seam of the coal mine, and the terms in the technical scheme can be explained and understood by using patent documents in the technical field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. Throughout the drawings, like elements or components are generally identified by like reference numerals. In the drawings, elements or components are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural diagram of the pre-splitting hole 4.
Fig. 3 is a schematic structural view of the water flow cutter 9.
In the figure, 1, a coal seam; 2. A gob; 3. a coal seam roof; 4. Pre-cracking holes; 5. A digging area; 40. a porous body; 41. a first transverse slot body; 42. a second transverse slot body; 43. a third transverse slot body; 44. a fourth transverse slot body; 45. a fifth transverse slot body; 46. a sixth transverse slot body; 6. a hydraulic support; 7. a conveyor; 8. a drilling machine; 9. a water flow cutter; 91. a rod portion; 92. a water spray hole body.
Detailed Description
Terms such as "having," "including," and "comprising," as used with respect to the present invention, are to be understood as not specifying the presence or addition of one or more other elements or combinations thereof, in accordance with the examination guidelines.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other, and further, unless otherwise specified, the equipments and materials used in the following examples are commercially available, and if the processing conditions are not explicitly specified, please refer to the commercially available product specifications or follow the conventional method in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-3, which illustrate a top coal pre-splitting section based on a hard and thick coal seam of a coal mine, fig. 1 shows a first embodiment of the present invention, which is described in detail with reference to the accompanying drawings, and includes pre-split holes 4, the pre-split holes 4 are arranged in the coal seam 1 corresponding to the goaf 2, and the pre-split holes 4 are arranged to extend from a mining area 5 to a coal seam roof 3.
In a first embodiment:
the included angle alpha between the central line of the pre-cracking holes 4 and the vertical line of the coal seam 1 is set to be 8-17 degrees, and the pre-cracking holes 4 are arranged and distributed at intervals along the vertical plane of the coal seam 1.
By pre-splitting hole 4, realized having formed the pre-splitting terminal surface in coal seam 1, its technical aim at: for forming a pre-fractured coal seam 1 inclined into the gob 2.
In the present embodiment, the pre-split hole 4 is provided to include a hole body 40, a first transverse slit body 41, a second transverse slit body 42, a third transverse slit body 43, a fourth transverse slit body 44, a fifth transverse slit body 45, and a sixth transverse slit body 46 and the hole body 40 is provided to communicate with the first transverse slit body 41, the second transverse slit body 42, the third transverse slit body 43, the fourth transverse slit body 44, the fifth transverse slit body 45, and the sixth transverse slit body 46, respectively, the first transverse slit body 41, the second transverse slit body 42, the third transverse slit body 43, the fourth transverse slit body 44, the fifth transverse slit body 45, and the sixth transverse slit body 46 are provided at a side surface of the hole body 40 and the first transverse slit body 41, the second transverse slit body 42, the third transverse slit body 43, the fourth transverse slit body 44, the fifth transverse slit body 45, and the sixth transverse slit body 46 are provided to be arranged along a center line of the hole 40, and the first transverse slit body 41, the second transverse slit body 42, the third transverse slit body 43, the fourth transverse slit body 44, the fifth transverse slit body 45, and the sixth transverse slit body 46 are provided to be arranged along a center line of the hole 40 and the hole body 41 is provided to be arranged along the center, The second transverse gap body 42, the third transverse gap body 43, the fourth transverse gap body 44, the fifth transverse gap body 45, and the sixth transverse gap body 46 are provided as slit bodies, respectively.
The formation of the pre-splitting end face in the coal seam 1 is realized by the hole body 40, the first transverse gap body 41, the second transverse gap body 42, the third transverse gap body 43, the fourth transverse gap body 44, the fifth transverse gap body 45 and the sixth transverse gap body 46, and the technical purpose is that: for increasing the separation area of the pre-splitting end face.
In the second embodiment of the present invention, the angle α between the centerline of the pre-split hole 4 and the vertical line of the coal seam 1 is set to 8 °.
In the third embodiment of the present invention, the angle α between the centerline of the pre-split hole 4 and the vertical line of the coal seam 1 is set to 17 °.
In the fourth embodiment of the present invention, the angle α between the centerline of the pre-split hole 4 and the vertical line of the coal seam 1 is set to 12 °.
Second embodiment of the invention:
integrating the branched pores of the pre-fractured group in such a way that a pre-fractured fracture is formed in the coal seam
A second embodiment of the invention is based on the first embodiment.
The utility model provides a caving coal presplitting section's presplitting device based on hard thick coal seam in colliery, includes hydraulic support 6, conveyer 7, rig 8 and rivers cutting knife 9 and be provided with hydraulic support 6 on the top layer of mining area 5, is provided with conveyer 7 and rig 8 sets up on conveyer 7 in mining area 5, and rivers cutting knife 9 sets up on rig 8.
In the present embodiment, the hydraulic support 6 is provided as a forepoling hydraulic support and the hydraulic support 6 is provided in the excavation zone 5.
Through hydraulic support 6, its technical aim lies in: for supporting the excavation zone 5.
In this embodiment the conveyor 7 is arranged as a scraper conveyor and the conveyor 7 is arranged to extend between the excavation zone 5 and the goaf 2, the conveyor 7 being arranged to be coupled to a drilling rig 8.
Through conveyer 7, formed the support connection point to rig 8, by conveyer 7, realized the connection with rig 8, its technical aim at: for use as a support carrier for the transfer rig 8.
In the present embodiment, the drilling machine 8 is arranged as an emulsion drilling machine and the base of the drilling machine 8 is arranged in connection with the conveyor 7.
Through rig 8, formed the support connection point to conveyer 7, by rig 8, realized the connection with conveyer 7, its technical aim at: for forming a pore body 40 in the coal seam 1.
In this embodiment, the side surface portion of the upper end of the rod portion 91 of the water jet cutting blade 9 is provided with the water spray hole body 92 and the upper end of the rod portion 91 is provided with a cutting edge, the rod portion 91 is provided with a channel hole and the channel hole of the rod portion 91 is set to communicate with the water spray hole body 92, the rod portion 91 is set to be a rod-shaped body having a blind hole and the water spray hole body 92 is set to be a flat hole body.
Through water flow cutting knife 9, its technical aim at: for forming a first transverse slot body 41, a second transverse slot body 42, a third transverse slot body 43, a fourth transverse slot body 44, a fifth transverse slot body 45 and a sixth transverse slot body 46 in the coal seam 1.
In the present embodiment, the hydraulic support 6 and the drill 8 and the water jet cutters 9 are arranged to be distributed in such a manner as to form a bifurcated hole body and the hydraulic support 6, the drill 8 and the water jet cutters 9 and the conveyor 7 are arranged to be distributed in such a manner as to transport the carrier.
The invention is further described below with reference to the following examples, which are intended to illustrate the invention but not to limit it further.
The invention discloses a method for pre-splitting a top coal caving pre-splitting section based on a hard thick coal seam of a coal mine, which comprises the following steps of:
s1, supporting the hydraulic support 6 on the excavation area 5, placing the drilling machine 8 on the conveyor 7, installing the drilling machine 8 at the pre-splitting operation point through the conveyor 7, installing the coal seam drill rod on the drilling machine 8, setting the included angle alpha between the center line of the coal seam drill rod and the vertical line of the coal seam 1 to be 8-17 degrees, starting the drilling machine 8, forming a hole body 40 in the coal seam 1, setting the distance between the bottom end of the hole body 40 and the coal seam roof 3 to be 800-1100mm, drilling the hole body 40 on the vertical plane of the coal seam 1 at intervals of 1500-1900mm,
s2, the rod part 91 is communicated with the water pump, so that the water jet is jetted through the water jet hole body 92, the rod part 91 is placed in the hole body 40 to rotate, and the water jet jetted through the water jet hole body 92 forms a first transverse gap body 41, a second transverse gap body 42, a third transverse gap body 43, a fourth transverse gap body 44, a fifth transverse gap body 45 and a sixth transverse gap body 46 at intervals of 500-700mm along the central line of the hole body 40.
The second embodiment of the present invention comprises the following steps:
a1, arranging an emulsion drilling machine on a front conveyor frame of a working face, and constructing a drill hole in the middle of a working face support towards the top inclined mining area side by using the emulsion drilling machine, wherein the drill hole is constructed to a position 1m away from the coal seam roof;
a2, conveying high-pressure water to a water conservancy cutter by a pump station through a drill rod, cutting the coal bed by the high-pressure water in the rotation process of the drilling machine, and cutting the hard coal bed into blocks;
a3, breaking the coal body by water conservancy cutting, and fully breaking the coal body by the extrusion of the self-weight stress of the overlying rock stratum and the supporting force of the bracket, thereby achieving the purpose of caving the top coal.
In a third embodiment of the present invention, the steps are:
s1, supporting the hydraulic support 6 on the excavation area 5, placing the drilling machine 8 on the conveyor 7, installing the drilling machine 8 at a pre-splitting operation point through the conveyor 7, installing a coal seam drill rod on the drilling machine 8, setting an included angle alpha between the central line of the coal seam drill rod and the vertical line of the coal seam 1 to be 8 degrees, starting the drilling machine 8, forming a hole body 40 in the coal seam 1, enabling the distance between the bottom end of the hole body 40 and the coal seam roof 3 to be 800mm, drilling the hole body 40 on the vertical plane of the coal seam 1 at intervals of 1500mm,
s2, the lever 91 is connected to the water pump, the water jet is jetted through the water jet hole 92, the lever 91 is placed in the hole 40 to rotate, and the water jet jetted through the water jet hole 92 forms the first lateral gap body 41, the second lateral gap body 42, the third lateral gap body 43, the fourth lateral gap body 44, the fifth lateral gap body 45, and the sixth lateral gap body 46 every 500mm along the center line of the hole 40.
The fourth embodiment of the present invention comprises the following steps:
s1, supporting the hydraulic support 6 on the excavation area 5, placing the drilling machine 8 on the conveyor 7, installing the drilling machine 8 at a pre-splitting operation point through the conveyor 7, installing a coal seam drill rod on the drilling machine 8, setting an included angle alpha between the central line of the coal seam drill rod and the vertical line of the coal seam 1 to be 17 degrees, starting the drilling machine 8, forming a hole body 40 in the coal seam 1, setting the distance between the bottom end of the hole body 40 and the coal seam roof 3 to be 1100mm, drilling the hole body 40 on the vertical plane of the coal seam 1 at intervals of 1900mm,
s2, the lever 91 is connected to the water pump, the water jet is jetted through the water jet hole 92, the lever 91 is placed in the hole 40 to rotate, and the water jet jetted through the water jet hole 92 forms the first transverse gap body 41, the second transverse gap body 42, the third transverse gap body 43, the fourth transverse gap body 44, the fifth transverse gap body 45, and the sixth transverse gap body 46 every 700mm along the center line of the hole 40.
The fifth embodiment of the present invention comprises the following steps:
s1, supporting the hydraulic support 6 on the excavation area 5, placing the drilling machine 8 on the conveyor 7, installing the drilling machine 8 at a pre-splitting operation point through the conveyor 7, installing a coal seam drill rod on the drilling machine 8, setting an included angle alpha between the center line of the coal seam drill rod and the vertical line of the coal seam 1 to be 12 degrees, starting the drilling machine 8, forming a hole body 40 in the coal seam 1, enabling the distance between the bottom end of the hole body 40 and the coal seam roof 3 to be 950mm, drilling the hole body 40 on the vertical plane of the coal seam 1 at intervals of 1700mm,
s2, the lever 91 is connected to the water pump, the water jet is jetted through the water jet hole 92, the lever 91 is placed in the hole 40 to rotate, and the water jet jetted through the water jet hole 92 forms the first lateral gap body 41, the second lateral gap body 42, the third lateral gap body 43, the fourth lateral gap body 44, the fifth lateral gap body 45, and the sixth lateral gap body 46 every 600mm along the center line of the hole 40.
The invention has the following characteristics:
1. because 4 groups of pre-cracking holes are designed, cracking sections are formed in the coal seam 1 between the goaf 2, the coal seam roof 3 and the mining area 5 through the 4 groups of pre-cracking holes, and the coal body is not crushed by the dead weight of the bracket and the overlying strata, so that the top coal caving effect is improved, and the volume of the coal block is reduced.
2. The hole body 40, the first transverse gap body 41, the second transverse gap body 42, the third transverse gap body 43, the fourth transverse gap body 44, the fifth transverse gap body 45 and the sixth transverse gap body 46 are designed, so that the cracking effect is increased.
3. Due to the design of the hydraulic support 6, the conveyor 7, the drilling machine 8 and the water flow cutting knife 9, the pre-splitting hole 4 is formed.
4. Because the structural shape is limited by the numerical range, the numerical range is the technical characteristic of the technical scheme of the invention, and is not the technical characteristic obtained by formula calculation or limited tests, and tests show that the technical characteristic of the numerical range achieves good technical effect.
5. Due to the design of the technical characteristics of the invention, tests show that each performance index of the invention is at least 1.7 times of the existing performance index under the action of the single and mutual combination of the technical characteristics, and the invention has good market value through evaluation.
Still other features that are the same as or similar to those of the set of pre-split holes 4 forming a pre-set fracture section in the coal seam 1 are one of the embodiments of the present invention, and the features of the above-described embodiments may be combined arbitrarily, and in order to meet the requirements of patent laws, patent practice rules and examination guidelines, all possible combinations of the features of the above-described embodiments will not be described again.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention, and the technical solutions are all covered in the scope of the claims and the specification of the present invention; it will be apparent to those skilled in the art that any alternative modifications or variations to the embodiments of the present invention may be made within the scope of the present invention.
The present invention is not described in detail, but is known to those skilled in the art.

Claims (10)

1. The utility model provides a caving coal presplitting section based on hard thick coal seam in colliery which characterized in that: comprises a pre-cracking hole group which is distributed in a branched hole way and is arranged in a coal seam (1), wherein the pre-cracking hole group comprises a plurality of pre-cracking holes (4).
2. The top coal caving pre-splitting section based on the hard thick coal seam of the coal mine as claimed in claim 1, wherein: branching holes of the pre-split hole set are integrated in such a way that a pre-set split profile is formed in the coal seam (1).
3. The top coal caving pre-splitting section based on the hard thick coal seam of the coal mine as claimed in claim 1, wherein: the pre-splitting holes (4) are arranged in the coal seam (1) corresponding to the goaf (2), and the pre-splitting holes (4) are arranged to extend from the mining area (5) to the coal seam roof (3).
4. The top coal caving pre-splitting section based on the hard thick coal seam of the coal mine as claimed in claim 3, wherein: the included angle alpha between the central line of the pre-cracking holes (4) and the vertical line of the coal seam (1) is set to be 8-17 degrees, and the pre-cracking holes (4) are arranged and distributed at intervals along the vertical plane of the coal seam (1).
5. The top coal caving pre-splitting section based on the hard thick coal seam of the coal mine as claimed in claim 4, wherein: the pre-splitting hole (4) comprises a hole body (40), a first transverse gap body (41), a second transverse gap body (42), a third transverse gap body (43), a fourth transverse gap body (44), a fifth transverse gap body (45) and a sixth transverse gap body (46), the hole body (40) is respectively communicated with the first transverse gap body (41), the second transverse gap body (42), the third transverse gap body (43), the fourth transverse gap body (44), the fifth transverse gap body (45) and the sixth transverse gap body (46), the first transverse gap body (41), the second transverse gap body (42), the third transverse gap body (43), the fourth transverse gap body (44), the fifth transverse gap body (45) and the sixth transverse gap body (46) are arranged on the side surface of the hole body (40), and the first transverse gap body (41), the second transverse gap body (42), the third transverse gap body (43), the fourth transverse gap body (44) and the sixth transverse gap body (46) are arranged on the side surface of the hole body (40), The fifth transverse gap body (45) and the sixth transverse gap body (46) are arranged and distributed at intervals along the center line of the hole body (40), the hole body (40) is a circular hole body, and the first transverse gap body (41), the second transverse gap body (42), the third transverse gap body (43), the fourth transverse gap body (44), the fifth transverse gap body (45) and the sixth transverse gap body (46) are respectively arranged into a slit body.
6. The utility model provides a top coal presplitting section's presplitting device based on hard thick coal seam in colliery which characterized in that: include hydraulic support (6), conveyer (7), rig (8) and rivers cutting knife (9), be provided with on the top layer of mining area (5) hydraulic support (6) are provided with in mining area (5) conveyer (7), rig (8) set up on conveyer (7), rivers cutting knife (9) installation sets up on rig (8).
7. The top coal caving pre-splitting section pre-splitting device based on the hard thick coal seam of the coal mine as claimed in claim 6, wherein: the hydraulic support (6) is arranged as a forepoling hydraulic support, and the hydraulic support (6) is arranged in the excavation area (5);
or the conveyor (7) is arranged as a scraper conveyor, the conveyor (7) is arranged between the mining area (5) and the goaf (2) to extend and run, and the conveyor (7) is connected with the drilling machine (8);
or the drilling machine (8) is set as an emulsion drilling machine, and the base of the drilling machine (8) is connected with the conveyor (7);
or, the side part of the upper end head of the rod part (91) of the water flow cutting knife (9) is provided with a water spraying hole body (92), the upper end head of the rod part (91) is provided with a cutting edge, a channel hole is formed in the rod part (91), the channel hole of the rod part (91) is communicated with the water spraying hole body (92), the rod part (91) is a rod-shaped body with a blind hole, and the water spraying hole body (92) is a flat hole body.
8. The top coal caving pre-splitting section pre-splitting device based on the hard thick coal seam of the coal mine as claimed in claim 6, wherein: the hydraulic support (6) and the drilling machine (8) and the water flow cutting knife (9) are distributed according to a mode of forming a forked hole body, and the hydraulic support (6), the drilling machine (8), the water flow cutting knife (9) and the conveyor (7) are distributed according to a mode of conveying carriers.
9. A top coal caving pre-splitting section pre-splitting method based on a hard and thick coal seam of a coal mine is characterized by comprising the following steps: the method comprises the following steps:
s1, supporting a hydraulic support (6) on a mining area (5), placing a drilling machine (8) on a conveyor (7), installing the drilling machine (8) at a pre-splitting operation point through the conveyor (7), installing a coal seam drill rod on the drilling machine (8), setting an included angle alpha between a center line of the coal seam drill rod and a vertical line of a coal seam (1) to be 8-17 degrees, starting the drilling machine (8), forming a hole body (40) in the coal seam (1), setting the distance between the bottom end of the hole body (40) and a coal seam roof (3) to be 800-shaped and 1100mm, drilling the hole body (40) on a vertical plane of the coal seam (1) at intervals of 1500-shaped and 1900mm,
s2, communicating the rod part (91) with a water pump, spraying the water jet through the water spraying hole body (92), putting the rod part (91) into the hole body (40) to rotate, and forming a first transverse gap body (41), a second transverse gap body (42), a third transverse gap body (43), a fourth transverse gap body (44), a fifth transverse gap body (45) and a sixth transverse gap body (46) through the water jet sprayed from the water spraying hole body (92) at intervals of 500-700mm along the central line of the hole body (40).
10. The method for pre-splitting the top coal caving pre-splitting section based on the hard thick coal seam of the coal mine according to claim 9, wherein: the method comprises the following steps:
a1, arranging an emulsion drilling machine on a front conveyor frame of a working face, and constructing a drill hole in the middle of a working face support towards the top inclined mining area side by using the emulsion drilling machine, wherein the drill hole is constructed to a position 1m away from the coal seam roof;
a2, conveying high-pressure water to a water conservancy cutter by a pump station through a drill rod, cutting the coal bed by the high-pressure water in the rotation process of the drilling machine, and cutting the hard coal bed into blocks;
a3, breaking the coal body by water conservancy cutting, and fully breaking the coal body by the extrusion of the self-weight stress of the overlying rock stratum and the supporting force of the bracket, thereby achieving the purpose of caving the top coal.
CN201911025566.9A 2019-10-25 2019-10-25 Top coal caving pre-splitting section, pre-splitting device and method based on hard and thick coal seam of coal mine Pending CN110644995A (en)

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Publication number Priority date Publication date Assignee Title
CN201090139Y (en) * 2007-10-11 2008-07-23 中国矿业大学 Press control drill scalpel integration drilling bit
CN103089269A (en) * 2013-01-23 2013-05-08 中国矿业大学 Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power

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