CN113107523B - Gap-expanding support method and grouting support process for rock burst support - Google Patents
Gap-expanding support method and grouting support process for rock burst support Download PDFInfo
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- CN113107523B CN113107523B CN202110364808.8A CN202110364808A CN113107523B CN 113107523 B CN113107523 B CN 113107523B CN 202110364808 A CN202110364808 A CN 202110364808A CN 113107523 B CN113107523 B CN 113107523B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention belongs to the technical field of support, in particular to a gap-scraping support method and a grouting support process for rock burst support, which comprise a roadway, wherein the roadway comprises a roadway top and a roadway side, a reinforcing assembly and an anchor rod cable net assembly are arranged in the roadway, and reinforcing grooves are symmetrically formed in the bottom end of the side surface of the roadway side; the reinforcing component comprises reinforcing steel ropes, reinforcing mesh holes, reinforcing anchor rods, reinforcing sheets and reinforcing nuts; the anchor rod cable net assembly comprises an anchor rope steel rope, anchor rope mesh holes, anchor rope anchor rods, anchor rope sheets and anchor rope nuts; the inside cavity that is of anchor rod is consolidated to the hollow chamber, has seted up the internal thread on the cavity intracavity wall, and cavity internally mounted has hollow interior pole, and the external screw thread has been seted up to the cooperation on the hollow interior pole lateral wall, and the rotation groove has been seted up on hollow interior pole top, and the inside grafting of rotation groove has the rotor, supports when drawing together the clearance, can expand the clearance to the tunnel depths in the increase security.
Description
Technical Field
The invention belongs to the technical field of supporting for coal mines, in particular to a rock burst roadway design, and particularly relates to a gap supporting method and a grouting supporting process for rock burst supporting.
Background
Coal mines are reasonable spaces that humans excavate when mining coal-rich geologic formations, and generally include roadways, shaft pits, and face formations, among others. Coal mine roadways are various passages drilled between the earth's surface and the ore body for carrying ores, ventilation, drainage, pedestrians, and various necessary preparation passages newly drilled for the extraction of ores by metallurgical equipment. Along with the development of technology, the coal mine roadway support is subjected to the processes of wood support, arch support and section steel frame shed support to an anchor rod net rope support, the anchor rod net rope support is used as a novel support means, belongs to an active support mode, deformation of the side wall of the roadway can be prevented, anchor rod grouting is an important part of the anchor rod net rope support, and the surrounding rock body is reinforced by injecting grout capable of cementing broken rock into surrounding rock cracks, so that the better the effect of exciting the rock cracks in practice is, the higher the cementing strength of the surrounding rock is, the pressure release function is realized, the transmission of stress in the rock body needs a certain path, and the cracks in the rock body are the path through which the stress flows, and generally, the more the corresponding cracks are, the faster the stress is lost. At present, before the anchor rod net rope of a roadway is supported, the weaknesses in surrounding rocks are required to be increased by adopting corresponding measures so as to be beneficial to the release of the stress of the original rocks and the smooth flowing line of grouting slurry, thereby achieving the purposes of releasing the internal stress of the surrounding rocks, improving the cementing range of the surrounding rocks after grouting and stabilizing the surrounding rocks.
Disclosure of Invention
The existing gap expansion is carried out before support, the side wall of the roadway is at risk of falling off in the gap expansion process, the existing gap expansion method is to use a pneumatic pick to blow the wall of the roadway and use a vibration method to expand the gap, but the effect is poor, the gap expansion range is small, only the shallow part inside the wall of the roadway can be penetrated, the desired effect cannot be achieved during grouting, and a thicker layer cannot be formed. The invention provides a gap-scraping supporting method and a grouting supporting process for rock burst supporting, which are used for supporting while scraping gaps, and can be used for carrying out matched construction, so that the safety is improved, and the deep gaps of a roadway can be expanded.
The invention provides the following technical scheme:
a shotcrete supporting method and grouting supporting technology for rock burst supporting comprises a roadway, wherein the roadway comprises a roadway top and a roadway side, a reinforcing assembly and an anchor rod cable net assembly are arranged in the roadway, and reinforcing grooves are symmetrically formed in the bottom ends of the side surfaces of the two groups of roadway sides; the reinforcing component comprises reinforcing steel ropes, reinforcing meshes, reinforcing anchor rods, reinforcing sheets and reinforcing nuts, wherein the reinforcing meshes are woven by a plurality of groups of reinforcing steel ropes, the reinforcing anchor rods penetrate through the reinforcing meshes and are arranged on the side walls of the reinforcing grooves, the reinforcing sheets are sleeved on the side walls of the reinforcing anchor rods, and the reinforcing nuts are arranged on the side walls of the reinforcing anchor rods in a threaded manner; the anchor rod cable net assembly comprises anchor rope steel ropes, anchor rope mesh openings, anchor rope anchor rods, anchor rope pieces and anchor rope nuts, wherein the anchor rope mesh openings are woven by a plurality of groups of anchor rope steel ropes, the anchor rope anchor rods penetrate through the anchor rope mesh openings and are arranged on the inner side of a roadway, the anchor rope pieces are sleeved on the side walls of the anchor rope anchor rods, and the anchor rope nuts are installed on the side walls of the anchor rope anchor rods in a threaded mode; the reinforced anchor rod is characterized in that the reinforced anchor rod is a hollow cavity, internal threads are formed in the inner wall of the hollow cavity, grout outlet grooves are formed in the inner wall of the hollow cavity at equal intervals, a hollow inner rod is mounted in the hollow cavity, external threads are formed in the side wall of the hollow inner rod in a matched mode, grout leakage grooves are formed in the side wall of the hollow inner rod at intervals of the external threads, a hollow drill bit is communicated with the bottom end of the hollow inner rod, a rotating groove is formed in the top end of the hollow inner rod, a rotating piece is inserted into the rotating groove and comprises a rotating rod and a rotating disc, the rotating disc is fixed at the top end of the rotating rod, and a driving groove is formed in the center of the top end of the rotating disc.
The vertical section of the reinforcing groove is right trapezoid, and the bottom edge of the right trapezoid is longer than the length of the reinforcing anchor rod.
The length of the reinforcing sheet is larger than that of the reinforcing mesh, and the width of the reinforcing sheet is larger than that of the reinforcing mesh.
The anchor cable anchor rod comprises a surface anchor rod with smaller depth and a deep anchor rod with larger depth.
The length of the anchor cable sheet is greater than the length of the anchor cable mesh, and the width of the anchor cable sheet is greater than the width of the anchor cable mesh.
The length of the hollow inner rod is equal to that of the reinforced anchor rod, and the external threads are arranged from the bottom end of the hollow inner rod and are smaller than that of the hollow inner rod.
The two groups of through holes are symmetrically arranged, and the length of the extension rod is equal to the vertical distance from the bottom end of the vertical chute to the top end of the vertical plate.
The rotating grooves and the driving grooves are cross grooves, six groups of circumferences are uniformly arranged at the top end of the hollow inner rod, and the rotating rods are cross rods matched with the rotating grooves.
The gap supporting method and grouting supporting process for rock burst supporting comprise the following steps:
s1, pre-reinforcing: reinforcing grooves are arranged on two sides of a roadway bottom corner, reinforcing anchor rods are arranged on the side walls of the juncture of the reinforcing grooves and roadway sides, reinforcing components are installed, the reinforcing components are covered with grouting after fixing and are flush with the outer side surfaces of reinforcing sheets, grouting is carried out through the reinforcing anchor rods after grouting is finished, and the bottom of the roadway is reinforced in advance through the reinforcing components;
s2, supporting an anchor rod cable net: laying anchor cable bolts on the roadway roof and the roadway side, installing an anchor bolt cable net assembly, fixing, spraying slurry to cover the anchor bolt cable net assembly to be flush with the outer side surface of an anchor cable sheet, and primarily supporting the anchor cable bolts by using a surface anchor bolt and a deep anchor bolt;
s3, surface layer gap expansion: the sound wave generator is used for carrying out sound wave vibration gap expansion on the shallower position of the roadway surface layer;
s4, grouting a surface layer: after the surface layer expands the gap, grouting the shallow position of the side wall of the roadway by using the surface layer anchor rod in the S;
s5, deep layer gap expansion: after the intensity of the slurry in the surface layer is improved, the parameters are adjusted by using the sound wave generator again, and the sound wave vibration gap expansion is carried out at the deep position of the roadway by using the sound wave;
s6, deep grouting: after deep layer gap expansion, grouting the deep layer position of the roadway by using the deep anchor rod in the S;
s7, filling concrete: and (3) filling the reinforced groove with concrete so that the reinforced groove is flush with the bottom end of the roadway.
The gap supporting method and grouting supporting process for rock burst supporting comprise the following steps:
step one, deep grouting of a reinforced anchor rod: when grouting is performed by using the reinforced anchor rod, the rotating disc is driven to rotate by using the cooperation of the external cross connector and the driving groove, so that the rotating rod drives the hollow inner rod to rotate, the hollow inner rod is pushed out from the reinforced anchor rod, the hollow inner rod drills into the deep under the cooperation of the hollow drill bit, and deep grouting is performed by the grouting leakage groove;
step two, grouting the surface layer of the reinforced anchor rod: and after the slurry strength of deep grouting is improved, grouting the surface layer by utilizing a slurry outlet groove on the reinforced anchor rod.
Compared with the prior art, the invention has the beneficial effects that: through setting up reinforcement subassembly and stock cable net subassembly, utilize the cooperation of the two, consolidate the slot in roadway base angle both sides peripheral hardware, lay reinforcing anchor rod at the lateral wall at reinforcement slot and lane group juncture, carry out the installation of reinforcement subassembly, fixed back guniting covers reinforcement subassembly and reinforcement piece lateral surface parallel and level, carry out the slip casting through reinforcing anchor rod after the guniting is accomplished, consolidate the roadway bottom in advance through reinforcement subassembly, at the in-process of slip casting, deep slip casting is carried out first, carry out the top of the roadway and lane group and carry out the laying of anchor rope stock, carry out the installation of stock cable net subassembly, fixed back guniting covers stock cable net subassembly and anchor rope piece lateral surface parallel and level, the anchor rope stock divide into top layer stock and deep stock, carry out preliminary support, through the acoustic wave generator, utilize the acoustic wave vibrations of the shallow position in roadway top layer stock to expand the clearance, after the top layer expansion, after the thick liquid intensity in the surface layer promotes, utilize the acoustic wave generator again, adjust the parameter, utilize the acoustic wave to carry out the acoustic wave vibrations of deep position to expand, after deep layer expansion, utilize deep layer slip casting to carry out the deep position, carry out the laying of the anchor rope stock, the deep position is expanded, the roadway is expanded, the bottom of roadway is carried out the clearance simultaneously, the roadway is filled with the deep is expanded, the roadway is expanded, the tunnel is expanded, the bottom is realized simultaneously, the tunnel is expanded, the tunnel is shotcreted, and can be shodded, the bottom, the roadway is shotcrete.
None of the devices/methods are related to the same or are implemented using prior art.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a reinforcement assembly according to the present invention;
FIG. 3 is a schematic view of the structure of the anchor rod cable net assembly of the present invention;
FIG. 4 is a schematic view of a reinforced anchor rod structure according to the present invention;
FIG. 5 is a schematic view of a cross-sectional structure of a reinforced anchor rod according to the present invention;
FIG. 6 is a schematic view of the hollow inner bolt structure of the present invention;
fig. 7 is a schematic view of a rotor structure according to the present invention.
In the figure: 1. a roadway roof; 2. roadway side; 3. a reinforcement assembly; 300. reinforcing the steel rope; 301. reinforcing mesh openings; 302. reinforcing an anchor rod; 303. a reinforcing sheet; 304. reinforcing the nut; 4. an anchor rod cable net assembly; 400. an anchor cable steel rope; 401. anchor cable mesh openings; 402. an anchor rope anchor rod; 403. an anchor cable sheet; 404. an anchor cable nut; 5. reinforcing the trench; 6. an internal thread; 7. a slurry outlet groove; 8. a hollow inner rod; 9. an external thread; 10. a hollow drill bit; 11. a rotating groove; 12. a rotating lever; 13. a rotating disc; 14. and a driving groove.
Detailed Description
Referring to fig. 1-7, the present invention provides the following technical solutions:
the gap-scraping supporting method and grouting supporting technology for rock burst supporting comprise a roadway, wherein the roadway comprises a roadway top (1) and a roadway side (2), a reinforcing component (3) and an anchor rod cable net component (4) are arranged in the roadway, and reinforcing grooves (5) are symmetrically formed in the bottom ends of the side surfaces of the roadway side (2) in two groups; the reinforcing assembly (3) comprises reinforcing steel ropes (300), reinforcing mesh holes (301), reinforcing anchor rods (302), reinforcing sheets (303) and reinforcing nuts (304), wherein the reinforcing mesh holes (301) are formed by weaving a plurality of groups of reinforcing steel ropes (300), the reinforcing anchor rods (302) penetrate through the reinforcing mesh holes (301) and are arranged on the side walls of the reinforcing grooves (5), the reinforcing sheets (303) are sleeved on the side walls of the reinforcing anchor rods (302), and the reinforcing nuts (304) are arranged on the side walls of the reinforcing anchor rods (302) in a threaded mode; the anchor rod cable net assembly (4) comprises anchor rope steel ropes (400), anchor rope meshes (401), anchor rope anchor rods (402), anchor rope pieces (403) and anchor rope nuts (404), wherein the anchor rope meshes (401) are woven by a plurality of groups of anchor rope steel ropes (400), the anchor rope anchor rods (402) penetrate through the anchor rope meshes (401) to be arranged on the inner side of a roadway, the anchor rope pieces (403) are sleeved on the side walls of the anchor rope anchor rods (402), and the anchor rope nuts (404) are installed on the side walls of the anchor rope anchor rods (402) in a threaded mode; the reinforced anchor rod (302) is internally provided with a hollow cavity, the inner thread (6) is arranged on the inner wall of the hollow cavity, the slurry outlet grooves (7) are formed in the inner thread (6) at intervals, the hollow cavity is internally provided with a hollow inner rod (8), the side wall of the hollow inner rod (8) is provided with external threads (9) in a matched mode, the side wall of the hollow inner rod (8) is provided with slurry leakage grooves at intervals of the external threads (9), the bottom end of the hollow inner rod (8) is communicated with a hollow drill bit (10), the top end of the hollow inner rod (8) is provided with a rotary groove (11), rotary pieces are inserted into the rotary groove (11) and comprise rotary rods (12) and rotary discs (13), the rotary discs (13) are fixed at the top ends of the rotary rods (12), and driving grooves (14) are formed in the centers of the top ends of the rotary discs (13).
The vertical section of the reinforcement groove (5) is right trapezoid, the bottom edge of the right trapezoid is longer than the length of the reinforcement anchor rod (302), and the side surface of the reinforcement groove (5) close to the roadway side (2) and the side surface of the roadway side (2) are located on the same vertical surface, so that the reinforcement assembly (3) is conveniently distributed.
The length of the reinforcing sheet (303) is larger than that of the reinforcing mesh (301), and the width of the reinforcing sheet (303) is larger than that of the reinforcing mesh (301), so that the reinforcing sheet (303) is ensured to press the reinforcing steel rope (300) when the reinforcing anchor rod (302) is fixed through the reinforcing sheet (303) and the reinforcing nut (304).
The size of anchor rope mesh (401) is less than the size of consolidate mesh (301), consolidate the degree of density of mesh (301) and be greater than anchor rope mesh (401), anchor rope stock (402) are including the less top layer stock of degree of depth and the great deep stock of degree of depth, and intensive setting consolidate mesh (301) when consolidating reinforcement slot (5), improved the intensity of consolidating.
The length of anchor rope piece (403) is greater than the length of anchor rope mesh (401), the width of anchor rope piece (403) is greater than the width of anchor rope mesh (401), ensures anchor rope piece (403) compress tightly anchor rope steel cable (400) when consolidate anchor rope stock (402) through anchor rope piece (403) and anchor rope nut (404).
The length of hollow interior pole (8) equals the length of reinforcing stock (302), external screw thread (9) set up from hollow interior pole (8) bottom and length is less than the length of hollow interior pole (8), when utilizing the screw-thread fit drive hollow interior pole (8) of external screw thread (9) and internal screw thread (6) to stretch out reinforcing stock (302), avoid hollow interior pole (8) and reinforcing stock (302) to separate completely.
The diameter of the bottom end of the hollow drill bit (10) is smaller than that of the hollow inner rod (8), the diameter of the top end of the hollow drill bit (10) is equal to that of the hollow inner rod (8), and when the hollow drill bit (10) rotates to work, the bottom end drilling position of the hollow drill bit is not in contact with the hollow cavity inside the reinforced anchor rod (302) so that the hollow drill bit can extend out of the reinforced anchor rod (302).
The rotating groove (11) and the driving groove (14) are cross grooves, six groups of circumferences are uniformly formed in the top end of the hollow inner rod (8), the rotating rod (12) is a cross rod matched with the rotating groove (11), the rotating disc (13) is driven to rotate by means of the cooperation of an external cross joint and the driving groove (14), the rotating rod (12) drives the hollow inner rod (8) to rotate, and the hollow inner rod (8) is pushed out from the reinforced anchor rod (302).
A gap supporting method and grouting supporting process for rock burst supporting comprises the following steps:
s1, pre-reinforcing: reinforcing grooves (5) are arranged on two sides of a roadway bottom corner, reinforcing anchor rods (302) are arranged on the side walls of the boundary between the reinforcing grooves (5) and the roadway side walls (2), a reinforcing component (3) is installed, the outer side faces of the reinforcing component (3) and the reinforcing piece (303) are flush after the reinforcing component is fixed, grouting is carried out through the reinforcing anchor rods (302) after the grouting is finished, and the bottom of the roadway is reinforced in advance through the reinforcing component (3);
s2, supporting an anchor rod cable net: laying anchor cable bolts (402) on a roadway roof (1) and a roadway wall (2), installing an anchor cable net assembly (4), and spraying slurry to cover the outer side surfaces of the anchor cable net assembly (4) and anchor cable sheets (403) to be flush after fixing, wherein the anchor cable bolts (402) are divided into surface-layer anchor bolts and deep-layer anchor bolts for preliminary support;
s3, surface layer gap expansion: the sound wave generator is used for carrying out sound wave vibration gap expansion on the shallower position of the roadway surface layer;
s4, grouting a surface layer: after the surface layer expands the gap, grouting the shallow position of the side wall of the roadway by using the surface layer anchor rod in the step S2;
s5, deep layer gap expansion: after the intensity of the slurry in the surface layer is improved, the parameters are adjusted by using the sound wave generator again, and the sound wave vibration gap expansion is carried out at the deep position of the roadway by using the sound wave;
s6, deep grouting: after deep layer gap expansion, grouting the deep layer position of the roadway by using the deep anchor rod in the S2;
s7, filling concrete: and (3) filling the reinforced groove (5) with concrete so as to be flush with the bottom end of the roadway.
A gap supporting method and grouting supporting process for rock burst supporting comprises the following steps:
step one, deep grouting of a reinforced anchor rod (302): when grouting is performed by using the reinforced anchor rod (302), the rotating disc (13) is driven to rotate by using the cooperation of the external cross joint and the driving groove (14), so that the rotating rod (12) drives the hollow inner rod (8) to rotate, the hollow inner rod (8) is pushed out from the reinforced anchor rod (302), and under the cooperation of the hollow drill bit (10), the hollow inner rod (8) drills deep, and deep grouting is performed by the grouting leakage groove;
step two, grouting the surface layer of the reinforced anchor rod (302): and after the slurry strength of deep grouting is improved, performing surface grouting by utilizing a slurry outlet groove (7) on the reinforced anchor rod (302).
The working principle and the using flow of the invention are as follows:
when supporting is carried out in a coal mine roadway, reinforcing grooves (5) are arranged on two sides of a roadway bottom corner, the side walls of the boundary between the reinforcing grooves (5) and a roadway side (2) are provided with reinforcing bolts (302), a reinforcing assembly (3) is installed, grouting is carried out after the reinforcing assembly (3) is fixed and the outer side faces of reinforcing plates (303) are flush, grouting is carried out through the reinforcing bolts (302) after grouting is finished, the bottom of the roadway is reinforced in advance through the reinforcing assembly (3), in the grouting process of the reinforcing bolts (302), the rotating disc (13) is driven to rotate by utilizing the cooperation of external cross connectors and driving grooves (14), the hollow inner rods (8) are driven to rotate by the rotating rods (12), and then the hollow inner rods (8) are pushed out from the reinforcing bolts (302), under the cooperation of a hollow drill bit (10), deep grouting is carried out in advance through a grouting leakage groove, and grouting is carried out on the surface layer of the reinforcing bolts (302) by utilizing the grouting grooves (7) on the reinforcing bolts (302) after the strength of deep grouting is improved; secondly, laying anchor cable anchors (402) on a roadway roof (1) and a roadway wall (2), installing anchor cable net assemblies (4), fixing, spraying slurry to cover the outer side surfaces of the anchor cable net assemblies (4) and anchor cable sheets (403) to be flush, and primarily supporting the anchor cable anchors (402) by using surface anchor rods and deep anchor rods; then, through the acoustic wave generator, utilize the acoustic wave to shake the spread gap of the shallower position in tunnel top layer, after the spread gap in top layer, utilize the top layer stock to carry out the slip casting of the shallower position in tunnel lateral wall, after the thick liquid intensity in the surface layer promotes, utilize the acoustic wave generator again, adjust the parameter, utilize the acoustic wave to shake the spread gap in the deep position of tunnel, after the deep spread gap, utilize the deep stock to carry out the slip casting in the deep position of tunnel, carry out concrete filling to reinforcement slot (5) at last, make it and tunnel bottom parallel and level, realize the reinforcement to the tunnel.
Claims (9)
1. The utility model provides a tunnel to rock burst support which characterized in that: the roadway comprises a roadway top and a roadway side, wherein a reinforcing assembly and an anchor rod cable net assembly are arranged in the roadway, and reinforcing grooves are symmetrically formed in the bottom ends of the side surfaces of the two groups of roadway sides; the reinforcing component comprises reinforcing steel ropes, reinforcing meshes, reinforcing anchor rods, reinforcing sheets and reinforcing nuts, wherein the reinforcing meshes are woven by a plurality of groups of reinforcing steel ropes, the reinforcing anchor rods penetrate through the reinforcing meshes and are arranged on the side walls of the reinforcing grooves, the reinforcing sheets are sleeved on the side walls of the reinforcing anchor rods, and the reinforcing nuts are arranged on the side walls of the reinforcing anchor rods in a threaded manner; the anchor rod cable net assembly comprises anchor rope steel ropes, anchor rope mesh openings, anchor rope anchor rods, anchor rope pieces and anchor rope nuts, wherein the anchor rope mesh openings are woven by a plurality of groups of anchor rope steel ropes, the anchor rope anchor rods penetrate through the anchor rope mesh openings and are arranged on the inner side of a roadway, the anchor rope pieces are sleeved on the side walls of the anchor rope anchor rods, and the anchor rope nuts are installed on the side walls of the anchor rope anchor rods in a threaded mode; the reinforced anchor rod is characterized in that the reinforced anchor rod is a hollow cavity, internal threads are formed in the inner wall of the hollow cavity, grout outlet grooves are formed in the inner wall of the hollow cavity at equal intervals, a hollow inner rod is mounted in the hollow cavity, external threads are formed in the side wall of the hollow inner rod in a matched mode, grout leakage grooves are formed in the side wall of the hollow inner rod at intervals of the external threads, a hollow drill bit is communicated with the bottom end of the hollow inner rod, a rotating groove is formed in the top end of the hollow inner rod, a rotating piece is inserted into the rotating groove and comprises a rotating rod and a rotating disc, the rotating disc is fixed at the top end of the rotating rod, and a driving groove is formed in the center of the top end of the rotating disc.
2. A roadway for rock burst supports as claimed in claim 1, wherein: the vertical section of the reinforcement groove is right trapezoid, and the bottom edge of the right trapezoid is longer than the length of the reinforcement anchor rod.
3. A roadway for rock burst supports as claimed in claim 2, wherein: the length of the reinforcing sheet is greater than the length of the reinforcing mesh, and the width of the reinforcing sheet is greater than the width of the reinforcing mesh.
4. A roadway for rock burst supports as claimed in claim 3, wherein: the size of the anchor rope net hole is smaller than that of the reinforced net hole, the density of the reinforced net holes is larger than that of the anchor rope net hole, and the anchor rope anchor rod comprises a surface anchor rod with smaller depth and a deep anchor rod with larger depth.
5. A roadway for rock burst supports as claimed in claim 4, wherein: the length of the anchor rope sheet is greater than the length of the anchor rope mesh, and the width of the anchor rope sheet is greater than the width of the anchor rope mesh.
6. A roadway for rock burst supports as claimed in claim 5, wherein: the length of the hollow inner rod is equal to that of the reinforced anchor rod, and the external threads are arranged from the bottom end of the hollow inner rod and the length of the external threads is smaller than that of the hollow inner rod.
7. A roadway for rock burst supports as claimed in claim 6, wherein: the rotating grooves and the driving grooves are cross grooves, six groups of circumferences are uniformly arranged at the top end of the hollow inner rod, and the rotating rods are cross rods matched with the rotating grooves.
8. A roadway for rock burst supports as claimed in claim 7, wherein: the method comprises the following steps:
s1, pre-reinforcing: reinforcing grooves are arranged on two sides of a roadway bottom corner, reinforcing anchor rods are arranged on the side walls of the juncture of the reinforcing grooves and roadway sides, reinforcing components are installed, the reinforcing components are covered with grouting after fixing and are flush with the outer side surfaces of reinforcing sheets, grouting is carried out through the reinforcing anchor rods after grouting is finished, and the bottom of the roadway is reinforced in advance through the reinforcing components;
s2, supporting an anchor rod cable net: laying anchor cable bolts on the roadway roof and the roadway side, installing an anchor bolt cable net assembly, fixing, spraying slurry to cover the anchor bolt cable net assembly to be flush with the outer side surface of an anchor cable sheet, and primarily supporting the anchor cable bolts by using a surface anchor bolt and a deep anchor bolt;
s3, surface layer gap expansion: the sound wave generator is used for carrying out sound wave vibration gap expansion on the shallower position of the roadway surface layer;
s4, grouting a surface layer: after the surface layer expands the gap, grouting the shallow position of the side wall of the roadway by using the surface layer anchor rod in the S;
s5, deep layer gap expansion: after the intensity of the slurry in the surface layer is improved, the parameters are adjusted by using the sound wave generator again, and the sound wave vibration gap expansion is carried out at the deep position of the roadway by using the sound wave;
s6, deep grouting: after deep layer gap expansion, grouting the deep layer position of the roadway by using the deep anchor rod in the S;
s7, filling concrete: and (3) filling the reinforced groove with concrete so that the reinforced groove is flush with the bottom end of the roadway.
9. A roadway for rock burst supports as claimed in claim 8, wherein: the method comprises the following steps:
step one, deep grouting of a reinforced anchor rod: when grouting is performed by using the reinforced anchor rod, the rotating disc is driven to rotate by using the cooperation of the external cross connector and the driving groove, so that the rotating rod drives the hollow inner rod to rotate, the hollow inner rod is pushed out from the reinforced anchor rod, the hollow inner rod drills into the deep under the cooperation of the hollow drill bit, and deep grouting is performed by the grouting leakage groove;
step two, grouting the surface layer of the reinforced anchor rod: and after the slurry strength of deep grouting is improved, grouting the surface layer by utilizing a slurry outlet groove on the reinforced anchor rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110364808.8A CN113107523B (en) | 2021-04-06 | 2021-04-06 | Gap-expanding support method and grouting support process for rock burst support |
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| CN202110364808.8A CN113107523B (en) | 2021-04-06 | 2021-04-06 | Gap-expanding support method and grouting support process for rock burst support |
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| CN113107523B true CN113107523B (en) | 2023-06-20 |
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| CN109372555A (en) * | 2018-12-26 | 2019-02-22 | 中国矿业大学 | A kind of fault disruption zone area tunnel 3 D stereo grouting support method |
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