CN111520158A - Inclined coal seam fully-mechanized coal mining face roadway combined supporting system and supporting method thereof - Google Patents
Inclined coal seam fully-mechanized coal mining face roadway combined supporting system and supporting method thereof Download PDFInfo
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- CN111520158A CN111520158A CN202010347234.9A CN202010347234A CN111520158A CN 111520158 A CN111520158 A CN 111520158A CN 202010347234 A CN202010347234 A CN 202010347234A CN 111520158 A CN111520158 A CN 111520158A
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 74
- 239000003245 coal Substances 0.000 title claims abstract description 56
- 238000005065 mining Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004873 anchoring Methods 0.000 claims abstract description 58
- 230000000712 assembly Effects 0.000 claims description 16
- 238000000429 assembly Methods 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000011435 rock Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract 1
- 238000007569 slipcasting Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/006—Lining anchored in the rock
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/28—Longitudinal struts, i.e. longitudinal connections between adjoining arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a combined supporting system and a supporting method for a fully mechanized mining face roadway of an inclined coal seam, relates to the technical field of coal mine roadway supporting, and solves the technical problem that the supporting effect of the fully mechanized mining face of the inclined coal seam is poor by using a U-shaped support supporting and anchor net cable spraying supporting technology in the prior art. The combined supporting system for the roadway of the fully mechanized mining working surface of the inclined coal seam comprises a supporting assembly. The support assembly comprises a U-shaped bracket and a plurality of first anchoring pieces and second anchoring pieces which are radially arranged on the U-shaped bracket. The first anchoring piece comprises a hollow grouting anchor rod and an anchor cable, and the hollow grouting anchor rod is sleeved outside the anchor cable. The second anchor comprises a hollow grouted anchor rod. The combined supporting system for the roadway of the fully mechanized mining working face of the inclined coal seam integrally connects the hollow grouting anchor rod, the anchor cable and the U-shaped bracket to form combined supporting, surrounding rock load is transmitted to the U-shaped bracket through the stress of the anchor cable and the hollow grouting anchor rod, and the anchoring force of the full section of the roadway is mutually superposed to increase the integral supporting strength.
Description
Technical Field
The invention relates to the technical field of coal mine roadway support, in particular to a combined support system and a combined support method for a roadway of a fully mechanized mining face of an inclined coal seam.
Background
The roadway support technology is a key technology in coal mining engineering. Compared with other geotechnical engineering fields, the stability of the surrounding rock of the coal mine tunnel is strongly influenced by dynamic pressure of a stope by 80%, and the maintenance condition of the coal mine tunnel mainly depends on mining influence except natural influence factors of the position of the tunnel.
The fully-mechanized coal mining face stope structure of the inclined coal seam is greatly different from that of a common horizontal coal seam, due to the factor of the working face surrounding rock covering environment, the covering structure of the overlying rock stratum of the top plate of the roadway of the working face is shown in fig. 10, on the premise of not considering horizontal structural stress, the self weight of the overlying rock stratum can be decomposed into sigma 1x along the normal direction of the top plate and sigma 1y along the tangential direction, so that the transportation drift close to the side of the top plate and the return air drift close to the side of the bottom plate form an asymmetric deformation and damage characteristic, and the deformation and crushing degree of a left half arch at the top of the roadway close to the side of the.
The traditional roadway support mode is as follows:
(1) the U-shaped support, however, the U-shaped support is mostly point contact support, and the effective area of contact of support and tunnel wall is less, and the atress situation is relatively poor, and bearing capacity is not given full play to.
(2) The anchor net cable-shotcrete supporting process has the advantages that due to the special overlying strata structure of the inclined coal seam, the effect is not ideal in the traditional supporting process of adding shotcrete to anchor rods, anchor nets and anchor cables, and the supporting process is particularly serious in the process of penetrating through a broken zone. The traditional solid anchor rod has poor shearing resistance, and in a special surrounding rock covering structure of fully mechanized caving mining of an inclined coal seam, the shearing resistance of the anchor rod is particularly important, so that the anchor rod falls off or is sheared and broken in the process of rock stratum plastic deformation or roof separation and rib spalling, and the whole-field anchoring even failure cannot be realized.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art, and provides a combined support system for a roadway of a fully mechanized mining face of an inclined coal seam, so as to solve the technical problem that the traditional U-shaped support and anchor net cable-jet support technology is poor in support effect on the fully mechanized mining face of the inclined coal seam.
The combined supporting system for the inclined coal seam fully mechanized coal mining face roadway solves the technical problems by adopting the following technical scheme:
the roadway combined supporting system for the fully mechanized mining working face of the inclined coal seam comprises a supporting assembly, wherein the supporting assembly comprises a U-shaped bracket, and the U-shaped bracket is supported on the inner wall of the roadway;
the U-shaped support is radially provided with a plurality of first anchoring parts and second anchoring parts, and the first anchoring parts and the second anchoring parts penetrate through the U-shaped support and extend into the roadway to be fixed with the roadway;
the first anchoring part comprises a hollow grouting anchor rod and an anchor cable, the hollow grouting anchor rod is sleeved outside the anchor cable, and a first tray and a first fastening part which are used for fixing the first anchoring part and the U-shaped bracket are arranged at the tail part of the anchor cable;
the second anchoring piece comprises a hollow grouting anchor rod, and a second tray and a second fastening piece which are used for fixing the second anchoring piece and the U-shaped support are arranged at the tail part of the hollow grouting anchor rod.
Preferably, the U-shaped support comprises two layers of U-shaped shells, and foamed aluminum is filled between the two layers of U-shaped shells.
Preferably, the combined supporting system further comprises an anchor net, wherein the anchor net is arranged on the inner wall of the roadway and arranged between the roadway and the U-shaped support.
Preferably, the combined supporting system comprises a plurality of supporting assemblies, and the supporting assemblies are distributed along the length direction of the roadway.
Preferably, adjacent supporting assemblies are connected through a connecting assembly.
Preferably, the anchor cable and the outer wall of the tail part of the hollow grouting anchor rod are both provided with external threads, and the first fastener and the second fastener are both nuts;
the first fastener penetrates through the tail part of the anchor cable to be matched with the external thread of the tail part of the anchor cable, so that the first tray, the first anchoring part and the U-shaped bracket are fixed;
and the second fastener penetrates through the tail part of the hollow grouting anchor rod to be matched with the external thread at the tail part of the hollow grouting anchor rod, so that the second tray, the second anchoring part and the U-shaped bracket are fixed.
Preferably, the connecting assembly comprises a connecting head and a connecting rod;
the connector includes the connecting seat, the connecting seat top be provided with can with anchor rope afterbody threaded connection's fore-set, connecting seat lateral part level is provided with first connecting cylinder and second connecting cylinder, first connecting cylinder with the connection can be dismantled to the connecting rod, the second connecting cylinder with another the connection can be dismantled to the connecting rod.
Preferably, the connecting rod includes length adjustment pole and sets up respectively the connecting rod at length adjustment pole both ends, length adjustment pole threaded connection is in inside or outside the connecting rod, rotates length adjustment pole can adjust the length of connecting rod.
Preferably, the first connecting cylinder is hinged to the connecting seat, so that the first connecting cylinder can rotate in the horizontal direction, and the connecting seat is further provided with a control piece for controlling the first connecting cylinder to rotate.
Compared with the prior art, the inclined coal seam fully-mechanized coal mining face roadway combined supporting system has the beneficial effects that:
1. the combined supporting system for the roadway of the fully mechanized mining working face of the inclined coal seam integrates the hollow grouting anchor rod, the anchor cable and the U-shaped support to form combined supporting, surrounding rock load is transmitted to the U-shaped support through the stress of the anchor cable and the hollow grouting anchor rod, the anchoring force of the full section of the roadway is mutually superposed, and the integral supporting strength is improved.
2. The first anchoring part and the second anchoring part of the fully mechanized coal mining face roadway combined supporting system for the inclined coal seam are fixed with the U-shaped support, so that the contact area between the U-shaped support and the roadway is indirectly increased, and the bearing capacity of the U-shaped support is fully exerted. And after the combined support is formed, the falling and failure of the hollow grouting anchor rod and the anchor cable can be avoided, so that the whole anchoring effect is improved.
3. The combined supporting system for the inclined coal seam fully-mechanized coal mining face roadway selects the first anchoring piece and the second anchoring piece, the first anchoring piece is used for key supporting of the area with large roadway stress aiming at the particularity of stress of the overlying strata of the top plate of the fully-mechanized coal mining face stope of the inclined coal seam, the second anchoring piece is used for supporting the area with small roadway stress, supporting strength is effectively improved, and manpower, financial resources and material resources are saved.
4. The U-shaped support of the fully mechanized mining face roadway combined supporting system for the inclined coal seam is light in weight, convenient to transport, simple to install, low in labor intensity and low in cost. And because the middle part of the U-shaped support is provided with the foamed aluminum, compared with the existing pure U-shaped steel support, the U-shaped steel support has better flexibility, higher bending strength and strong impact resistance. In the supporting process, the support can be slightly deformed after being stressed, so that the U-shaped support is in contact with the full section of the roadway, the contact area between the U-shaped support and the roadway is increased, the stress is uniform, and the bearing capacity can be fully exerted.
5. The connecting assembly of the roadway combined supporting system of the fully mechanized mining working face of the inclined coal seam connects the adjacent supporting assemblies, so that a plurality of U-shaped supports in the roadway, and hollow grouting anchor rods and anchor cables arranged on the U-shaped supports are connected into a whole, the range and the strength of combined supporting are further increased, and the overall supporting strength is further increased.
6. The connecting assembly of the roadway combined supporting system of the fully mechanized mining working face of the inclined coal seam has the advantages of ingenious design, simple structure, low cost, quick and convenient disassembly and assembly, and can be used when the roadway is nonlinear.
The invention also provides a combined supporting method for the inclined coal seam fully mechanized coal mining face roadway, which comprises the following steps:
step 1: drilling holes, wherein a plurality of drilling holes are arranged along the arch axis and two sides of the roadway to form drilling holes, and the diameters of the drilling holes are determined according to the specification of the hollow grouting anchor rod; a plurality of second drill holes are arranged at two sides of the roadway, and the depth of each second drill hole is matched with the length of the corresponding second anchoring piece; a plurality of first drill holes and second drill holes are arranged on the arch axis of the roadway, the first drill holes are positioned at the positions of the roadway needing key supporting, and the depth of the first drill holes is matched with the length of the first anchoring piece;
step 2: tightly attaching the anchor net to the inner surface of the roadway;
and step 3: fixing the U-shaped support close to the inner surface of the roadway, wherein the position of a drill hole drilled in advance on the U-shaped support is required to be superposed with the position of the drill hole in the step 1 in the process;
and 4, step 4: firstly, driving the anchor cable into a first drill hole, and applying prestress; sleeving the hollow grouting anchor rod on the anchor cable and driving the anchor cable into a first drilling hole, and fixing the anchor cable, the hollow grouting anchor rod and the U-shaped bracket through the first tray and a first fastener;
driving the hollow grouting anchor rod into a second drilling hole, and fixing the hollow grouting anchor rod and the U-shaped bracket through the second tray and a second fastener;
and 5: grouting, namely grouting through the hollow grouting anchor rod by using a grouting machine;
step 6: and (5) repeating the steps 1-5 until the whole roadway support is finished.
Compared with the prior art, the combined supporting method for the fully mechanized mining face roadway of the inclined coal seam has the beneficial effects that: aiming at the particularity of stress of an overlying rock stratum of a top plate of a stope of a fully mechanized coal mining face of an inclined coal seam, an asymmetric combined supporting technology is selected, and key supporting is performed on a special area of a roadway in a targeted manner, so that the supporting strength is effectively improved, and manpower, financial resources and material resources are saved.
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.
FIG. 1 is a schematic view of the connection of a first anchor and a second anchor to a U-shaped bracket according to the present invention;
FIG. 2 is a schematic cross-sectional view of a U-shaped bracket of the present invention;
FIG. 3 is a schematic view of a first tray of the present invention;
FIG. 4 is a schematic view of a first anchor of the present invention;
FIG. 5 is a schematic view of the present invention with the connector attached to a U-shaped bracket;
FIG. 6 is a schematic view of the connection head of the present invention in connection with a first anchor;
FIG. 7 is a schematic view of a connector according to the present invention;
FIG. 8 is an exploded view of the connector of the present invention;
FIG. 9 is a schematic view of the connection assembly of the present invention connecting adjacent support assemblies;
fig. 10 is a covering structure of overburden on a roadway roof of a working face of an existing inclined coal seam.
In the figure: 1-U-shaped support, 2-first anchoring piece, 3-second anchoring piece, 4-hollow grouting anchor rod, 5-anchor rope, 6-first tray, 7-second tray, 8-U-shaped shell, 9-foamed aluminum, 10-connector, 11-connecting rod, 12-connecting seat, 13-top column, 14-first connecting cylinder, 15-second connecting cylinder, 16-length adjusting rod, 17-connecting rod, 18-control piece, 19-transport level and 20-return level.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention and are not to be taken as a comprehensive embodiment. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1:
the utility model provides a slope coal seam is combined and is adopted working face tunnel and unite supporting system, as shown in figure 1, including strutting the subassembly, strutting the subassembly and including U type support 1, U type support 1 struts at the tunnel inner wall.
As shown in fig. 4, the first anchoring member 2 includes a hollow grouting anchor rod 4 and an anchor cable 5, the hollow grouting anchor rod 4 is sleeved outside the anchor cable 5, and a first tray 6 and a first fastener for fixing the first anchoring member 2 and the U-shaped bracket 1 are arranged at the tail of the anchor cable 5.
The second anchoring piece 3 comprises a hollow grouting anchor rod 4, and a second tray 7 and a second fastening piece which are used for fixing the second anchoring piece 3 and the U-shaped bracket 1 are arranged at the tail part of the hollow grouting anchor rod 4. Preferably, the outer surface of the hollow grouting bolt 4 is threaded.
The anchor cables 5 enable the structural plane and the broken rock mass to be in a compression state, and displacement of the rock mass is effectively controlled. According to the invention, the hollow grouting anchor rod 4, the anchor cable 5 and the U-shaped bracket 1 are connected into a whole to form combined support, the surrounding rock load is transmitted to the U-shaped bracket 1 through the stress of the anchor cable 5 and the hollow grouting anchor rod 4, the anchoring forces of the full section of the roadway are mutually superposed, and the integral support strength is increased.
According to the invention, the first anchoring part 2 and the second anchoring part 3 are fixed with the U-shaped support 1, so that the contact area between the U-shaped support 1 and a roadway is indirectly increased, and the bearing capacity of the U-shaped support 1 is fully exerted. And after the combined support is formed, the hollow grouting anchor rod 4 and the anchor cable 5 can be prevented from falling off and losing efficacy, so that the full-field anchoring effect is improved.
According to the invention, the first anchoring part 2 and the second anchoring part 3 are selected, aiming at the special stress of the overlying strata of the roof of the stope of the fully-mechanized coal caving face of the inclined coal seam, the first anchoring part 2 is used for carrying out key support on the area with larger stress of the roadway, and the second anchoring part 3 is used for carrying out support on the position with smaller stress of the roadway, so that the support strength is effectively improved, and the manpower, financial resources and material resources are saved.
The hollow grouting anchor rod 4 is adopted, so that the weight is light, the pulling resistance is large, and the labor intensity is low. The hollow grouting anchor rod 4 can be connected with the anchor cable 5 into a whole after grouting, so that the connection strength of the hollow grouting anchor rod 4 and a roadway is increased, the number of drilled holes and trays can be reduced, the supporting efficiency is greatly improved, and the supporting cost is saved.
Preferably, as shown in fig. 2, the U-shaped bracket 1 comprises two layers of U-shaped shells 8, and foamed aluminum 9 is filled between the two layers of U-shaped shells 8. Preferably, the U-shaped shell 8 is U-shaped steel.
The U-shaped support 1 is light in weight, convenient to transport, simple to install, low in labor intensity and low in cost. And because the middle part of the U-shaped support 1 is provided with the foamed aluminum 9, compared with the existing pure U-shaped steel support, the U-shaped steel support has better flexibility, higher bending strength and strong impact resistance. In the supporting process, the support can be slightly deformed after being stressed, so that the U-shaped support 1 is in contact with the full section of the roadway, the contact area between the U-shaped support 1 and the roadway is increased, the stress is uniform, and the bearing capacity can be fully exerted.
Preferably, the combined supporting system further comprises an anchor net, the anchor net is arranged on the inner wall of the roadway, and the anchor net is arranged between the roadway and the U-shaped support 1. Preferably, the anchor net is an antirust wire net.
Further combine anchor net, cavity slip casting stock 4, anchor rope 5 and U type support 1 into a joint support system, and country rock load anchor rope 5, cavity slip casting stock 4 and anchor net stress transfer to U type support 1, and the full section anchor power in tunnel superposes each other, increases holistic support intensity.
Preferably, as shown in fig. 3, the first tray 6 and the second tray 7 are matched with the inner surface of the U-shaped bracket 1, and after the first tray 6 is fixed with the first anchoring member 2 and the U-shaped bracket 1, the first tray 6 is contacted with the U-shaped bracket 1 more tightly. After the second tray 7 is fixed with the second anchoring part 3 and the U-shaped bracket 1, the second tray 7 is contacted with the U-shaped bracket 1 more tightly.
Preferably, the combined supporting system comprises a plurality of supporting assemblies, and the plurality of supporting assemblies are distributed along the length direction of the roadway. Preferably, as shown in fig. 9, the adjacent supporting assemblies are connected by a connecting assembly.
The connecting assembly connects adjacent supporting assemblies, so that the plurality of U-shaped supports 1 in the roadway, the hollow grouting anchor rods 4 and the anchor cables 5 arranged on the U-shaped supports 1 are connected into a whole, the range and the strength of combined supporting are further increased, and the overall supporting strength is further increased.
Preferably, the anchor cable 5 and the outer wall of the tail part of the hollow grouting anchor rod 4 are both provided with external threads, and the first fastener and the second fastener are both nuts.
The first fastener penetrates through the tail part of the anchor cable 5 to be matched with the external thread at the tail part of the anchor cable 5, and the first tray 6, the first anchoring part 2 and the U-shaped support 1 are fixed.
The second fastener passes the external screw thread cooperation of 4 afterbody and the cavity slip casting stock of cavity slip casting stock, fixes second tray 7, second anchor assembly 3 and U type support 1.
Preferably, as shown in fig. 5-9, the connecting assembly includes a connecting head 10 and a connecting rod 11. As shown in fig. 6-8, the connector 10 includes a connector holder 12. The top of connecting base 12 is provided with a top post 13 which can be screwed with the tail of anchor cable 5. The lateral part of the connecting base 12 is horizontally provided with a first connecting cylinder 14 and a second connecting cylinder 15, the first connecting cylinder 14 is detachably connected with the connecting rod 11, and the second connecting cylinder 15 is detachably connected with the other connecting rod 11.
When connecting adjacent support assemblies, as shown in fig. 5, the top post 13 of the connector 10 is directly screwed with the tail of the anchor cable 5 of the first anchor member 2, thereby connecting the connector 10 with the first anchor member 2. And then the other connector 10 is in threaded connection with the tail part of the anchor cable 5 on the first anchoring piece 2 at the corresponding position of the other supporting assembly. Finally, the connecting rod 11 is connected between the two connectors 10, one end of the connecting rod 11 is connected with the first connecting cylinder 14 of one connector 10, and the other end of the connecting rod 11 is connected with the second connecting cylinder 15 of the other connector 10. Thereby connecting adjacent support assemblies.
When the supporting strength is required to be increased, a plurality of first anchoring pieces 2 between adjacent supporting components can be connected through the connecting component according to the requirement.
It is noted that the top pillar 13 may also be arranged to be threadedly connected to the rear of the hollow grouting bolt 4 of the second anchor 3, so that a plurality of second anchors 3 on adjacent support assemblies may be connected by the connecting assembly.
And connector 10 and 5 afterbody threaded connection of cavity slip casting stock 4 or anchor rope, dismouting connector 10 is convenient, swift, after connecting connector 10 on cavity slip casting stock 4 or anchor rope 5 in addition, can rotate connector 10, makes the connector 10 that needs to connect relative, conveniently connects connecting rod 11 to after connecting connector 10, can avoid cavity slip casting stock 4 or anchor rope 5 tail end to expose outside, stab the staff.
Preferably, as shown in fig. 9, the connecting rod 11 includes a length adjusting rod 16 and connecting rods 17 respectively disposed at both ends of the length adjusting rod 16, the length adjusting rod 16 is screwed inside or outside the connecting rods 17, and the length of the connecting rod 11 can be adjusted by rotating the length adjusting rod 16.
The length of the connecting rod 11 can be adjusted by rotating the length adjusting rod 16, and the same is also applicable when the distances between the connecting heads 10 to be connected are different.
Preferably, the connecting rod 17 is screwed with the first connecting cylinder 14 and the second connecting cylinder 15. When the connector 10 is connected with the connecting rod 11, the connecting rod 11 is directly rotated, so that the connector 10 can be connected with the connecting rod 11, and the disassembly and the assembly are fast and convenient.
Preferably, a connector 10 may be provided between the connecting rods 11, and the first anchor 2 and/or the second anchor 3 are connected to the connector 10, so that more anchors are connected to the U-shaped bracket 1 as a whole.
Preferably, as shown in fig. 7 and 8, the first connecting cylinder 14 is hinged to the connecting section 12, so that the first connecting cylinder 14 can rotate in the horizontal direction. The connecting base 12 is further provided with a control member 18 for controlling the rotation of the first connecting cylinder 14.
When the roadway is nonlinear or the anchoring parts required to be connected are not in a straight line due to the construction of workers, the angle of the first connecting cylinder 14 can be adjusted, so that the adjacent anchoring parts can be connected through the connecting rod 11.
Preferably, the control member 18 is a bolt assembly disposed at the hinge joint of the first connecting cylinder 14 and the connecting seat 12. When the first connecting cylinder 14 needs to be rotated, the bolt assembly is loosened, and the first connecting cylinder 14 rotates with the bolt assembly as a rotating shaft. When the first connecting cylinder 14 needs to be fixed, the bolt assembly is screwed.
Example 2
A combined supporting method for a roadway of a fully mechanized mining face of an inclined coal seam comprises the following steps:
step 1: as shown in fig. 1, a plurality of drill holes are arranged along the arch axis and two sides of the roadway to form drill holes, and the diameters of the drill holes are determined according to the specification of the hollow grouting anchor rod 4. The bore diameter is 5-10mm larger than the outer diameter of the hollow grouting bolt 4. And 2 second drill holes are arranged at two sides of the roadway, and the depth of each second drill hole is matched with the length of the hollow grouting anchor rod 4. 5 first drill holes and 2 second drill holes are uniformly distributed on the arch axis of the roadway, wherein the 5 first drill holes are sequentially distributed from the left upper arch springing of the roadway, and the depth of each first drill hole is matched with the length of each anchor cable 5; the 6 th and 7 th boreholes from the left upper arch are the second boreholes.
Step 2: and tightly attaching the anchor net to the inner surface of the roadway.
And step 3: fixing the U-shaped support 1 to be tightly attached to the inner surface of the roadway, wherein the position of a drill hole drilled in advance in the U-shaped support 1 is required to be coincided with the position of the drill hole in the step 1 in the process.
And 4, step 4: firstly, driving an anchor cable 5 into a first drill hole, and applying prestress; and then sleeving the hollow grouting anchor rod 4 on the anchor cable 5 and driving the anchor cable into a first drilling hole, and fixing the anchor cable 5, the hollow grouting anchor rod 4 and the U-shaped support 1 on the inner wall of the U-shaped support 1 through the first tray 6 and the first fastener.
And (3) driving the hollow grouting anchor rod 4 into a second drilled hole, and fixing the hollow grouting anchor rod 4 and the U-shaped support 1 on the inner wall of the U-shaped support 1 through a second tray 7 and a second fastener.
And 5: and (4) grouting by using a grouting machine through the hollow grouting anchor rod 4.
Step 6: and (5) repeating the steps 1-5 until the whole roadway support is finished.
Preferably, in the grouting process, superfine cement is adopted as the grouting aggregate, and glass fiber is doped into the superfine cement slurry. The shear strength of the hollow grouting anchor rod 4 can be improved, and the friction force and the bonding shear strength between the outer surfaces of the hollow grouting anchor rod 4 and the anchor cable 5 and a rock stratum are increased; reducing the prestress loss and other mechanical properties of the anchor cable 5.
When connecting adjacent supporting assemblies, as shown in fig. 5 and 9, the top pillar 13 on the connector 10 is first screwed with the tail of the anchor cable 5 on one U-shaped bracket 1, so as to connect the connector 10 with one U-shaped bracket 1.
And then the other connector 10 is screwed with the tail part of the anchor cable 5 at the corresponding position on the other U-shaped bracket 1, so that the other connector 10 is connected with the other U-shaped bracket 1. The two connectors 10 are rotated to be opposite to each other, and then the length adjustment lever 16 is rotated to adjust the length of the connection rod 11. Then, the connecting rods 17 at the two ends of the connecting rod 11 are respectively connected with the first connecting cylinders 14 and the second connecting cylinders 15 of the two connectors 10, so that the two adjacent U-shaped brackets 1 are connected.
When the next U-shaped support 1 is connected, because the roadway is not a straight line, when the two connectors 10 cannot face each other, the bolt assembly is loosened, the angle of the first connecting cylinder 14 on one connector 10 is adjusted, so that the first connecting cylinder 14 on one connector 10 can face the second connecting cylinder 15 on the other connector 10, and then the bolt assembly is screwed down to fix the first connecting cylinder 14. Finally, two adjacent U-shaped brackets 1 are connected through a connecting rod 11.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. The combined supporting system for the roadway of the fully mechanized mining working surface of the inclined coal seam is characterized by comprising a supporting assembly, wherein the supporting assembly comprises a U-shaped bracket (1), and the U-shaped bracket (1) is supported on the inner wall of the roadway;
the U-shaped support (1) is radially provided with a plurality of first anchoring pieces (2) and second anchoring pieces (3), and the first anchoring pieces (2) and the second anchoring pieces (3) penetrate through the U-shaped support (1) and extend into the roadway to be fixed with the roadway;
the first anchoring piece (2) comprises a hollow grouting anchor rod (4) and an anchor cable (5), the hollow grouting anchor rod (4) is sleeved outside the anchor cable (5), and a first tray (6) and a first fastening piece which are used for fixing the first anchoring piece (2) and the U-shaped support (1) are arranged at the tail part of the anchor cable (5);
the second anchoring piece (3) comprises a hollow grouting anchor rod (4), and a second tray (7) and a second fastening piece which are used for fixing the second anchoring piece (3) and the U-shaped bracket (1) are arranged at the tail part of the hollow grouting anchor rod (4).
2. The combined supporting system for the roadway of the fully mechanized mining face of the inclined coal seam according to claim 1, wherein the U-shaped bracket (1) comprises two layers of U-shaped shells (8), and foamed aluminum (9) is filled between the two layers of U-shaped shells (8).
3. The combined supporting system for the roadway of the fully mechanized mining face of the inclined coal seam according to claim 1, characterized in that the combined supporting system further comprises an anchor net, the anchor net is arranged on the inner wall of the roadway, and the anchor net is arranged between the roadway and the U-shaped bracket (1).
4. The inclined coal seam fully mechanized mining face roadway combined support system according to any one of claims 1 to 3, wherein the combined support system comprises a plurality of support assemblies, and the plurality of support assemblies are distributed along the length direction of the roadway.
5. The combined support system for the fully mechanized mining face roadway of the inclined coal seam according to claim 4, wherein adjacent support assemblies are connected through a connecting assembly.
6. The combined support system for the roadway of the fully mechanized mining face of the inclined coal seam according to claim 5, wherein the anchor cable (5) and the outer wall of the tail part of the hollow grouting anchor rod (4) are provided with external threads, and the first fastener and the second fastener are nuts;
the first fastener penetrates through the tail part of the anchor cable (5) to be matched with the external thread at the tail part of the anchor cable (5), so that the first tray (6), the first anchoring piece (2) and the U-shaped bracket (1) are fixed;
the second fastener penetrates through the tail part of the hollow grouting anchor rod (4) to be matched with the external thread at the tail part of the hollow grouting anchor rod (4), and the second tray (7), the second anchoring piece (3) and the U-shaped bracket (1) are fixed.
7. The inclined coal seam fully mechanized mining face roadway combined support system according to claim 6, wherein the connecting assembly comprises a connecting head (10) and a connecting rod (11);
connector (10) are including connecting seat (12), connecting seat (12) top be provided with can with anchor rope (5) afterbody threaded connection's fore-set (13), connecting seat (12) lateral part level is provided with first connecting cylinder (14) and second connecting cylinder (15), first connecting cylinder (14) with connecting rod (11) can be dismantled and be connected, second connecting cylinder (15) and another connecting rod (11) can be dismantled and be connected.
8. The inclined coal seam fully mechanized mining face roadway combined support system according to claim 7, wherein the connecting rod (11) comprises a length adjusting rod (16) and connecting rods (17) respectively arranged at two ends of the length adjusting rod (16), the length adjusting rod (16) is in threaded connection with the inside or the outside of the connecting rods (17), and the length of the connecting rod (11) can be adjusted by rotating the length adjusting rod (16).
9. The combined support system for the roadway of the fully mechanized mining face of the inclined coal seam according to claim 7, wherein the first connecting cylinder (14) is hinged to the connecting seat (12) so that the first connecting cylinder (14) can rotate in the horizontal direction, and a control element (18) for controlling the rotation of the first connecting cylinder (14) is further arranged on the connecting seat (12).
10. A combined supporting method for a roadway of a fully mechanized mining face of an inclined coal seam is characterized by comprising the following steps:
step 1: drilling holes, wherein a plurality of drilling holes are formed along the arch axis and two sides of the roadway to form drilling holes, and the diameters of the drilling holes are determined according to the specification of the hollow grouting anchor rod (4); a plurality of second drill holes are arranged at two sides of the roadway, and the depth of each second drill hole is matched with the length of the second anchoring piece (3); a plurality of first drill holes and second drill holes are arranged on the arch axis of the roadway, the first drill holes are positioned at the positions of the roadway needing key supporting, and the depth of the first drill holes is matched with the length of the first anchoring piece (2);
step 2: tightly attaching the anchor net to the inner surface of the roadway;
and step 3: fixing the U-shaped support (1) according to the close contact with the inner surface of the roadway, wherein the process needs to coincide the position of a drill hole drilled in advance on the U-shaped support (1) with the position of the drill hole in the step 1;
and 4, step 4: firstly, driving the anchor cable (5) into a first drilling hole, and applying prestress; sleeving the hollow grouting anchor rod (4) on the anchor cable (5) and driving the anchor cable into a first drilling hole, and fixing the anchor cable (5), the hollow grouting anchor rod (4) and the U-shaped bracket (1) through the first tray (6) and a first fastener;
driving the hollow grouting anchor rod (4) into a second drilled hole, and fixing the hollow grouting anchor rod (4) and the U-shaped bracket (1) through the second tray (7) and a second fastener;
and 5: grouting, namely grouting through the hollow grouting anchor rod (4) by using a grouting machine;
step 6: and (5) repeating the steps 1-5 until the whole roadway support is finished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010347234.9A CN111520158B (en) | 2020-04-28 | 2020-04-28 | Inclined coal seam fully-mechanized coal mining face roadway combined supporting system and supporting method thereof |
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| CN202010347234.9A CN111520158B (en) | 2020-04-28 | 2020-04-28 | Inclined coal seam fully-mechanized coal mining face roadway combined supporting system and supporting method thereof |
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| CN115059488A (en) * | 2022-07-14 | 2022-09-16 | 河北工程大学 | Using method of shear-resistant anchor rod for deep roadway surrounding rock targeted control |
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| CN111520158B (en) | 2022-03-25 |
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