CN113107560A - Broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and using method thereof - Google Patents
Broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and using method thereof Download PDFInfo
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- CN113107560A CN113107560A CN202110512356.3A CN202110512356A CN113107560A CN 113107560 A CN113107560 A CN 113107560A CN 202110512356 A CN202110512356 A CN 202110512356A CN 113107560 A CN113107560 A CN 113107560A
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- yielding
- grouting anchor
- rod
- anchoring
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- 238000004873 anchoring Methods 0.000 title claims abstract description 77
- 239000003245 coal Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 57
- 239000002184 metal Substances 0.000 claims abstract description 57
- 239000004636 vulcanized rubber Substances 0.000 claims abstract description 36
- 239000011435 rock Substances 0.000 claims abstract description 28
- 238000001125 extrusion Methods 0.000 claims abstract description 16
- 239000004033 plastic Substances 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 16
- 239000011440 grout Substances 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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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
-
- 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
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
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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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- 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
- E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid
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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
- E21D21/008—Anchoring or tensioning means
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and a using method thereof belong to the technical field of underground engineering support. The device comprises an elastic yielding component consisting of a metal tray, a positioning rod, an annular vulcanized rubber air bag, a metal spacer and a limiting plate, a plastic yielding component consisting of a porous metal disc, a necking round rod and a high-strength porous extrusion plate, and a reinforced anchoring structure consisting of a hollow grouting anchor rod, a resistance-increasing pawl sleeve and the like. The hollow grouting anchor rod and the resistance-increasing pawl sleeve can effectively improve anchoring strength and mechanical property of a coal rock mass, when the coal rock mass deforms, the elastic yielding component and the plastic yielding component work in a coordinated mode, good large-deformation yielding working efficiency is achieved, the anchor rod is effectively prevented from being broken by overload, stability and safety in use of the coal rock mass and a supporting structure are maintained, supporting requirements of deep high-stress broken coal roadways are met, and the hollow grouting anchor rod and the resistance-increasing pawl sleeve have the advantages of being high in anchoring strength, constant in resistance yielding, reasonable in structure and the like.
Description
Technical Field
The invention relates to the field of underground engineering support, in particular to a reinforced anchoring type yielding grouting anchor rod anchoring device and method suitable for deep large-deformation broken coal roadways.
Background
In recent years, with the increasing of mining depths of mineral resources such as coal mines and metals, the facing mining environment and geological conditions are increasingly complex and changeable, surrounding rocks of a coal roadway are broken in some deep high-ground-stress areas, large deformation and damage are easy to occur, supporting difficulty of the deep high-stress coal roadway is caused, the surrounding rocks are still unstable after repeated repair, great threats are generated to constructors and production equipment, and the method is a technical problem to be solved urgently in safe and efficient development of the deep coal mine resources in China.
The anchor rod is used as an effective support form commonly used for surrounding rock control and is widely applied to the field of underground engineering. Generally, the anchor rod is made of twisted steel, the elongation rate of the anchor rod is low, and the extension length of the anchor rod is often insufficient when the anchor rod is used for a large deformation roadway with deep surrounding rock breakage, so that the anchor rod is easy to break and fail. In order to overcome the defects of elongation of the anchor rod, some yielding deformation anchoring devices are developed by combining the characteristics of the anchor rod at present, for example, a solid anchor rod, an anchor cable and a hollow anchor rod are combined by CN209654064U, a yielding device is sleeved on the hollow anchor rod to realize yielding support of a large deformation roadway, a yielding sleeve and an inner sliding piece are arranged at the anchor head of CN111456782A, the yielding sleeve is extruded by the inner sliding piece to generate plastic deformation to realize an energy-releasing yielding function, the CN212337328U divides the hollow grouting anchor rod into two sections, and the two sections of hollow anchor rods are fixedly connected by the yielding sleeve and the inner sliding piece, so that the hollow anchor rod has the characteristics of grouting reinforcement and yielding energy release. On one hand, however, due to the defects of the design of the yielding deformation anchoring device, such as the adoption of the combination of the anchor rod and the anchor cable and the sectional design, the yielding device is used as a connecting piece, whether the connection strength is sufficient or not is not considered, the structural strength is designed to have defects, and the adopted yielding form is single, so that the actual yielding deformation effect of the designed device is poor, and the yielding deformation anchoring device is difficult to meet the yielding requirement of a deep large-deformation roadway; on the other hand, the existing yielding deformation anchoring device does not fully consider the problem of insufficient anchoring strength in the use of the broken coal roadway, does not overcome the problem of anchor falling of the yielding deformation anchoring device, and is not suitable for deep broken coal roadway support. Therefore, the hollow grouting anchor rod anchoring device with large deformation yielding and enhanced anchoring characteristics is needed to be developed to meet the requirement of deep high large deformation broken coal roadway support.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a crushing coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and a use method thereof,
the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device comprises a hollow grouting anchor rod 1, wherein the tail part of the hollow grouting anchor rod 1 is provided with a resistance-increasing pawl sleeve 4, a grout stop plug 7 penetrating through the hollow grouting anchor rod 1 is positioned at the orifice section of an anchor hole 3,
a constant-resistance yielding structure is arranged in cooperation with the hollow grouting anchor rod 1, and comprises an elastic yielding component and a plastic yielding component which are axially overlapped and penetrated;
the elastic yielding assembly comprises an annular vulcanized rubber air bag 11 and a limiting plate 13 for limiting the deformation limit of the annular vulcanized rubber air bag 11;
the plastic yielding component comprises a porous metal disc 14, a necking round rod 15 and a high-strength porous extrusion plate 16.
Further, a metal tray 9 is further arranged on the hollow grouting anchor rod 1 in a penetrating mode, one side of the metal tray 9 is matched with the anchor hole 3, the other side of the metal tray 9 is in butt fit with an annular vulcanized rubber air bag 11 in the elastic yielding component, the limiting plate 13 comprises a raised circular ring which is matched with the metal tray 9, and the axial size of the circular ring is used for limiting the deformation limit of the annular vulcanized rubber air bag 11; the porous metal disc 14 abuts against one side, far away from the metal tray 9, of the annular vulcanized rubber air bag 11, the porous metal disc 14 comprises a plurality of threaded holes 20, the necking round rod 15 is an aluminum round rod and is installed on the threaded holes 20, the high-strength porous extrusion plate 16 is provided with a plurality of compression holes 21, the free end of the necking round rod 15 is provided with a necking portion, the necking portion is arranged in the compression holes 21 in a penetrating mode, and the diameter of the necking round rod 15 except the necking portion is larger than the diameter of the compression holes 21.
Further, a plurality of positioning rods 10 are arranged between the metal tray 9 and the limiting plate 13, and each positioning rod 10 is sleeved with the annular vulcanized rubber air bag 11.
Furthermore, a plurality of annular vulcanized rubber air bags 11 are arranged, the annular vulcanized rubber air bags 11 are overlapped and penetrate through the positioning rod 10, and a metal spacer 12 is arranged between every two adjacent annular vulcanized rubber air bags 11.
Furthermore, the rod body of the hollow grouting anchor rod 1 is provided with a plurality of slurry overflow holes 6, the tail part of the rod body is provided with at least one resistance-increasing pawl sleeve 4 which penetrates through the rod body and is welded on the rod body, and the resistance-increasing pawl sleeve 4 is a metal lantern ring with a plurality of pawls.
The use method of the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device comprises the steps of using any one of the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring devices; comprises the following steps:
s1, fixing the hollow grouting anchor rod 1 at the bottom of the anchor hole 3 by using the resin anchoring agent 5;
s2, a constant-resistance yielding structure is arranged in the hollow grouting anchor rod 1 in a penetrating mode;
s3, rigidly connecting a resistance-increasing pawl sleeve 4 at the tail part of the hollow grouting anchor rod 1 to form an anchoring and reinforcing structure;
s4, grouting and reinforcing the crushed coal rock body 2 through the hollow grouting anchor rod 1;
s5, applying prestress, and fixing the hollow grouting anchor rod 1 by using a bolt 17;
and S6, plugging the end of the hollow grouting anchor rod 1.
Further, the step s2 includes installing a rubber pad 8 on the coal rock mass outside the hole of the anchor hole 3.
Further, the step s2 includes inserting the grout stop plug 7 through the anchor rod 1 and into the hole of the anchor hole 3.
Has the advantages that: due to the adoption of the technical scheme, the grouting anchor rod device has the characteristics of large deformation yielding and enhanced anchoring strength, and overcomes the defects of insufficient yielding and low anchoring strength of the conventional grouting anchor rod device in dealing with large deformation broken coal roadways. A plurality of grout overflow holes are arranged on the rod body of the common grouting anchor rod, so that the grouting operation efficiency is improved; the resistance-increasing pawl sleeve is arranged at the tail part of the rod body of the hollow grouting anchor rod, so that the contact area between the rod body of the hollow grouting anchor rod and the resin anchoring agent is increased, the frictional resistance between the resistance-increasing pawl sleeve and the wall of the anchor hole obviously improves the anchoring strength of the hollow grouting anchor rod, and the defect that the mechanical anchoring strength of a common grouting anchor rod using an anchor head barb is insufficient is overcome; the annular vulcanized rubber air bags are used as elastic yielding components in the constant-resistance yielding structure to replace a traditional compression spring, so that the deformation capacity is stronger, the vulcanized rubber is more ageing-resistant, the defect that a metal spring is easy to rust and lose efficacy is overcome, and the metal isolation sheets are arranged between the annular vulcanized rubber air bags to effectively prevent rubber ageing accelerated by frictional heating between the rubber air bags; the limiting plate is arranged in the elastic yielding component to limit the compression and expansion of the annular vulcanized rubber air bag to exceed the limit, so that the elastic yielding component is prevented from losing efficacy due to the damage of the rubber air bag, and the yielding effect of the anchoring device is reduced; the metal tray is additionally provided with the positioning rod, so that the installation of the annular vulcanized rubber air bag is facilitated, the metal tray, the limiting plate and the porous metal disc are connected into a whole, and the overall stability of the constant-resistance yielding structure is improved; the necking round rod and the high-strength porous extrusion plate are used as a plastic yielding component to replace a yielding pipe, the extremely good ductility of an aluminum material is fully utilized, and the compression holes in the high-strength porous extrusion plate extrude the necking round rod to enable the necking round rod to be elongated, so that a yielding space is provided, and sufficient working resistance is also provided for a yielding anchoring device; the elastic yielding component and the plastic yielding component are combined into the constant-resistance yielding structure, when the coal rock mass deforms less, the elastic yielding component is firstly subjected to instantaneous compression deformation to provide yielding deformation, when the coal rock mass deforms further greatly, the plastic yielding component generates plastic deformation to provide yielding space, and the yielding structure adopting a single form is more reasonable. In conclusion, the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and the using method thereof disclosed by the invention have the characteristics of economy, reliability, reasonable structure, convenience in operation, strong applicability and the like, the anchoring strength of the broken coal roadway anchoring device is obviously improved, the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device has better large-deformation yielding efficiency, and the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device is suitable for coal-rock body support of a deep broken large-deformation coal roadway.
Drawings
FIG. 1 is a schematic view of an anchor eye in an embodiment of the present invention;
FIG. 2(a) is a schematic view of the installation of the anchoring device in the embodiment of the present invention;
FIG. 2(b) is a schematic view of the installation of the anchoring device in the embodiment of the present invention;
FIG. 2(c) is a schematic three-dimensional view of the installation of the anchoring device in an embodiment of the invention;
FIG. 2(d) is a four-schematic view of the installation of the anchoring device in an embodiment of the invention;
FIG. 3 is a schematic plan view of a positioning rod and a necking round rod of the present invention;
FIG. 4 is a schematic plan view of a metal tray and a three-dimensional schematic view of a limiting plate according to the present invention;
FIG. 5 is a schematic plan view of a porous metal disc and a high strength porous extrusion plate of the present invention;
FIG. 6 is a plan and three-dimensional schematic view of the resistance increasing pawl sleeve of the present invention;
FIG. 7 is an enlarged cross-sectional view of the annular vulcanized rubber bladder of the present invention.
FIG. 8 is a partially enlarged view of FIG. 2(d)
In the figure: 1-hollow grouting anchor rod, 2-coal rock mass, 3-anchor hole, 4-resistance-increasing pawl sleeve, 5-resin anchoring agent, 6-grout overflow hole, 7-grout stop plug, 8-rubber base plate, 9-metal tray, 10-positioning rod, 11-annular vulcanized rubber air bag, 12-metal spacer, 13-limiting plate, 14-porous metal disc, 15-necking round rod, 16-high-strength porous extrusion plate, 17-bolt, 18-positioning threaded hole, 19-positioning hole, 20-threaded hole, 21-compression hole and 22-coal rock mass crack.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
the invention relates to a broken coal roadway enhanced anchoring type yielding grouting anchor rod anchoring device, which mainly comprises a hollow grouting anchor rod 1 fixed in an anchor hole 3 through a resin anchoring agent 5, the tail part of the hollow grouting anchor rod 1 is provided with a resistance-increasing pawl sleeve 4, a grout stop plug 7 penetrating through the hollow grouting anchor rod 1 is positioned at the orifice section of the anchor hole 3, an elastic yielding component consisting of a metal tray 9, a positioning rod 10, an annular vulcanized rubber air bag 11, a metal spacing sheet 12 and a limiting plate 13 and a plastic yielding component consisting of a porous metal disc 14, a necking round rod 15 and a high-strength porous extrusion plate 16 are arranged outside the anchor hole 3, the elastic yielding component and the plastic yielding component jointly form a constant-resistance yielding structure, and a rubber base plate 8 is arranged between the metal tray 9 and the coal rock body 2, and the outer end of the high-strength porous extrusion plate 16 is provided with a bolt 17 for fastening the hollow grouting anchor rod 1.
As shown in FIG. 3, the positioning rod 10 is a metal round rod with equal diameter, the diameter of the rod body is about 5-8 mm, one end of the rod body is provided with threads, the necking round rod 15 is an aluminum round rod with variable diameter, the diameter of the end part of the round rod is about 10-12 mm, the diameter of the middle rod body of the round rod is about 12-15 mm, and the tail part of the round rod is provided with threads.
As shown in fig. 4, the metal tray 9 includes 4 positioning threaded holes 18, the positioning threaded holes 18 are used for connecting the positioning rod 10, the diameter of the positioning threaded holes 18 is the same as that of the positioning rod 10, the limiting plate 13 is a metal disc including 4 positioning holes 19, the diameter of the positioning holes 19 is matched with that of the positioning rod 10, the inner side of the limiting plate 13 includes a protruding ring, and the limitation of the compression and expansion of the annular vulcanized rubber airbag 11 is limited.
As shown in fig. 5, the porous metal disc 14 includes 4 positioning holes 19 and a plurality of threaded holes 20, the diameter of each threaded hole 20 is about 12-15 mm, and the threaded holes 20 are connected to the necking round bars 15, the high-strength porous extrusion plate 16 is a metal disc including a plurality of compression holes 21, the diameter of each compression hole 21 is about 10-12 mm, and the number of the compression holes 21 is the same as the number of the necking round bars 15.
As shown in figure 6, the resistance-increasing pawl sleeve 4 is a metal circular tube welded with 4 pawls, the inner diameter of the metal circular tube is matched with the hollow grouting anchor rod 1, the wall thickness of the circular tube is about 5-8 mm, and the length of the circular tube is about 50-70 mm.
As shown in fig. 7, the annular vulcanized rubber bladder 11 is an annular bladder made of vulcanized rubber and has good expansion performance.
As shown in figure 1, the diameter of an anchor hole 3 constructed in a coal rock body 2 of a broken coal roadway is matched with the diameter of a hollow grouting anchor rod 1.
As shown in fig. 2(a), 3-4 resistance-increasing pawl sleeves 4 penetrate through the hollow grouting anchor rod 1, are welded at the tail of the hollow grouting anchor rod 1 (the process can be completed on the ground in advance), the hollow grouting anchor rod 1 welded with the resistance-increasing pawl sleeves 4 is pushed into the anchor hole 3, the tail of the hollow grouting anchor rod 1 and the coal rock body 3 are anchored by using a resin anchoring agent 5, and a grout stop plug 7 penetrates through the hollow grouting anchor rod 1 and is plugged into the orifice of the anchor hole 3.
As shown in fig. 2(b), the positioning rod 10 is connected with the metal tray 9 (this process can be completed on the ground in advance), the assembly of the rubber tie plate 8, the positioning rod 10 and the metal tray 9 is passed through the hollow grouting anchor rod 1 in sequence and is tightly attached to the coal rock body 2 at the orifice, the annular vulcanized rubber air bag 11 and the metal spacer 12 are installed on the metal tray 9 through the positioning rod 10, and the metal spacer 12 is located between the annular vulcanized rubber air bags 11. And (3) penetrating a positioning hole 19 on the limiting plate 13 through the positioning rod 10, pushing the limiting plate 13 into the annular vulcanized rubber air bag 11 and abutting against the annular vulcanized rubber air bag, and completing the installation of the elastic yielding component.
As shown in fig. 2(c), a plurality of necking round rods 15 are correspondingly connected with threaded holes 20 on a porous metal disc 14 one by one (the process can be completed on the ground in advance), the assembled assembly passes through a positioning rod 10 and is installed on the outer side of a limiting plate 13, compression holes 21 on a high-strength porous extrusion plate 16 are butted with the end parts of the necking round rods 15, the installation of a plastic yielding component is completed, the hollow grouting anchor rod 1 is tensioned, prestress is applied, and the bolt 17 is used for extruding the high-strength porous extrusion plate 16 to fix the hollow grouting anchor rod 1.
As shown in fig. 2(d), after the reinforced anchoring type yielding grouting anchor rod anchoring device is assembled and anchored, a grouting pipe of grouting equipment is connected with the end of the hollow grouting anchor rod 1, high-pressure grouting is performed, after the anchor hole 3 and the crack 22 of the coal rock body 2 are filled with grout, the end of the hollow grouting anchor rod 1 is plugged, and grouting reinforcement operation of the anchoring device is completed.
The working principle is as follows: after the reinforced anchoring type yielding grouting anchor rod anchoring device is installed, grouting and reinforcing of the crushed coal rock mass are carried out through the hollow grouting anchor rod, slurry flows into the anchor hole through the slurry overflow hole of the rod body and finally enters cracks in the coal rock mass, the crushed coal rock mass is cemented into a whole, the mechanical property of the coal rock mass is improved, and the deformation resistance of the coal rock mass is improved; when the coal rock mass deforms and the axial tension of the hollow grouting anchor rod gradually increases, the bolt gradually transmits the axial tension to the limiting plate through the high-pressure multi-hole extrusion plate, the necking round rod and the multi-hole metal disc so that the limiting plate extrudes the annular vulcanized rubber air bag arranged on the positioning rod, the limiting plate moves towards the orifice coal rock mass until the protruding ring of the limiting plate contacts the metal tray to prevent the metal tray from continuously extruding the annular vulcanized rubber air bag, and the elastic yielding stage is completed; along with the axial tension of the hollow grouting anchor rod is further increased, the high-strength porous extrusion plate begins to extrude the necking round rod on the porous metal disc to enable the necking round rod to be subjected to plastic deformation, the necking round rod after necking deformation penetrates through the compression hole on the high-strength porous extrusion plate to generate a yielding space, and sufficient working resistance is provided for the anchoring device, so that the hollow grouting anchor rod is effectively prevented from being subjected to overload breakage to cause failure of a supporting structure.
The foregoing is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art and construction, various modifications or substitutions can be made without departing from the technical principle of the present invention, and these modifications or substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. Broken coal road reinforcing anchor type lets pressure slip casting stock anchor device, including cavity slip casting stock (1), its characterized in that: the tail part of the hollow grouting anchor rod (1) is provided with a resistance-increasing pawl sleeve (4), a grout stop plug (7) penetrating through the hollow grouting anchor rod (1) is positioned at the orifice section of the anchor hole (3),
a constant-resistance yielding structure is arranged in a matched manner with the hollow grouting anchor rod (1), and comprises an elastic yielding component and a plastic yielding component which are axially overlapped and penetrated;
the elastic yielding assembly comprises an annular vulcanized rubber air bag (11) and a limiting plate (13) for limiting the deformation limit of the annular vulcanized rubber air bag (11);
the plastic yielding component comprises a porous metal disc (14), a necking round rod (15) and a high-strength porous extrusion plate (16).
2. The crushing coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device according to claim 1, characterized in that:
a metal tray (9) is further arranged on the hollow grouting anchor rod (1) in a penetrating mode, one side of the metal tray (9) is matched with the anchor hole (3), the other side of the metal tray is matched with an annular vulcanized rubber air bag (11) in the elastic yielding component in a propping mode, a limiting plate (13) comprises a raised circular ring which is matched with the metal tray (9), and the axial size of the circular ring is used for limiting the deformation limit of the annular vulcanized rubber air bag (11); porous metal disc (14) butt keep away from in annular vulcanized rubber gasbag (11) one side of metal tray (9), porous metal disc (14) contain a plurality of screw holes (20), necking down round bar (15) be aluminium system round bar, install on screw hole (20), porous stripper plate (16) of excelling in be provided with a plurality of compression holes (21), necking down round bar (15) free end set up the throat, the throat wears to establish in compression holes (21), just diameter outside necking down round bar (15) the throat is greater than compression holes (21) diameter.
3. The crushing coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device according to claim 2, characterized in that: the metal tray (9) and the limiting plate (13) are provided with a plurality of positioning rods (10) therebetween, and each positioning rod (10) is sleeved with the annular vulcanized rubber air bag (11).
4. The crushing coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device according to claim 3, characterized in that:
the annular vulcanized rubber air bags (11) are multiple, the annular vulcanized rubber air bags (11) are overlapped and penetrate through the positioning rod (10), and a metal isolation sheet (12) is arranged between every two adjacent annular vulcanized rubber air bags (11).
5. The crushing coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device according to claim 1, characterized in that: the hollow grouting anchor rod (1) is characterized in that a rod body of the hollow grouting anchor rod (1) is provided with a plurality of slurry overflow holes (6), the tail part of the rod body is provided with at least one resistance-increasing pawl sleeve (4) which penetrates through the rod body and is welded on the rod body, and the resistance-increasing pawl sleeve (4) is a metal lantern ring with a plurality of pawls.
6. The use method of the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device is characterized in that the broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device of any one of claims 1 to 5 is used; comprises the following steps:
s1, fixing the hollow grouting anchor rod (1) at the bottom of the anchor hole (3) by using a resin anchoring agent (5);
s2, a constant-resistance yielding structure is arranged in the hollow grouting anchor rod (1) in a penetrating mode;
s3, rigidly connecting a resistance-increasing pawl sleeve (4) at the tail part of the hollow grouting anchor rod (1) to form an anchoring and reinforcing structure;
s4, grouting and reinforcing the crushed coal rock body (2) through the hollow grouting anchor rod (1);
s5, applying prestress, and fixing the hollow grouting anchor rod (1) by using a bolt (17);
s6, plugging the end of the hollow grouting anchor rod (1).
7. The use method of the crushed coal roadway reinforced anchoring type yielding grouting bolt anchoring device according to claim 6, wherein the step s2 further comprises installing a rubber pad (8) on the coal rock mass outside the hole of the anchor hole (3).
8. A method of using a crushed coal roadway enhanced anchoring type yielding grouting bolt anchoring device according to claim 6, wherein the step s2 further comprises inserting a grout stop plug (7) through the bolt (1) and into the hole of the bolt hole (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110512356.3A CN113107560B (en) | 2021-05-11 | 2021-05-11 | Broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110512356.3A CN113107560B (en) | 2021-05-11 | 2021-05-11 | Broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113107560A true CN113107560A (en) | 2021-07-13 |
| CN113107560B CN113107560B (en) | 2023-03-31 |
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| CN202110512356.3A Active CN113107560B (en) | 2021-05-11 | 2021-05-11 | Broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and using method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542144A (en) * | 2022-02-22 | 2022-05-27 | 中国矿业大学 | Broken surrounding rock enlarged type end anchoring multi-stage yielding constant-resistance large-deformation anchor rod and method |
| CN115013016A (en) * | 2022-06-17 | 2022-09-06 | 湖南科技大学 | Drilling, anchoring, injecting and discharging integrated construction method for broken surrounding rock control |
| CN116988825A (en) * | 2023-09-25 | 2023-11-03 | 中国矿业大学(北京) | Resistance-increasing large-deformation grouting anchor rod and application method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114542144A (en) * | 2022-02-22 | 2022-05-27 | 中国矿业大学 | Broken surrounding rock enlarged type end anchoring multi-stage yielding constant-resistance large-deformation anchor rod and method |
| CN115013016A (en) * | 2022-06-17 | 2022-09-06 | 湖南科技大学 | Drilling, anchoring, injecting and discharging integrated construction method for broken surrounding rock control |
| CN116988825A (en) * | 2023-09-25 | 2023-11-03 | 中国矿业大学(北京) | Resistance-increasing large-deformation grouting anchor rod and application method |
| CN116988825B (en) * | 2023-09-25 | 2023-12-05 | 中国矿业大学(北京) | Resistance-increasing large-deformation grouting anchor rod and application method |
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