CN116677436A - Porous yielding anchor rod device capable of grouting in segmented mode and application method thereof - Google Patents
Porous yielding anchor rod device capable of grouting in segmented mode and application method thereof Download PDFInfo
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- CN116677436A CN116677436A CN202310755034.0A CN202310755034A CN116677436A CN 116677436 A CN116677436 A CN 116677436A CN 202310755034 A CN202310755034 A CN 202310755034A CN 116677436 A CN116677436 A CN 116677436A
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- anchor rod
- grouting
- section
- anchor
- hole
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Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011435 rock Substances 0.000 claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000002955 isolation Methods 0.000 claims abstract description 33
- 239000004033 plastic Substances 0.000 claims abstract description 25
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 34
- 239000011440 grout Substances 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 27
- 238000004873 anchoring Methods 0.000 claims description 24
- 239000002002 slurry Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims 1
- 230000008093 supporting effect Effects 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
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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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/025—Grouting with organic components, e.g. resin
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- 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
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
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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 discloses a porous yielding anchor rod device capable of grouting in a segmented mode and a use method thereof, and belongs to the field of underground engineering support of roadways, tunnels and the like. The device comprises an anchor rod and a sleeve, wherein plastic teeth are arranged in the sleeve, and the plastic teeth on the inner wall of the sleeve are extruded by utilizing a high-strength nut at the end part of the anchor rod, so that plastic damage is generated to realize the yielding characteristic of the anchor rod device; when the surrounding rock is deformed greatly, the device can synchronously realize constant resistance large deformation, and the anchor rod device is ensured not to be damaged; the device can also realize sectional grouting, and the sectional grouting reinforcement is realized by pulling the sectional grouting stop plug inside the anchor rod through the circular isolation disc and the steel wire which are inherent outside the anchor rod. The structure of the invention can realize the constant resistance yielding effect, can partially and sectionally grouting, and has the advantages of various functions, constant resistance, reasonable structure, economy and applicability.
Description
Technical Field
The invention relates to the field of underground engineering support of roadways, tunnels and the like, in particular to a porous yielding anchor rod device capable of grouting in sections and a use method thereof.
Background
Along with the rapid development of underground engineering construction such as railway and highway tunnels, mine roadways, water conservancy and hydropower, water delivery tunnels and the like in China, along with the continuous increase of the exploitation depth of solid mineral products and the burial depth of tunnels and tunnels, the faced exploitation environment and engineering geological conditions are more complex. The deep surrounding rock roadway is influenced by three-high and one-disturbance and is easy to deform and damage, and the supporting problem of the deep surrounding rock roadway becomes an important task for deep mining and tunnel engineering construction.
The anchor rod is a supporting form which is widely and effectively applied to the field of underground engineering supporting, and in order to solve the supporting problem of large deformation of broken surrounding rock, the anchor rod is required to not only provide constant supporting force, but also generate large elongation deformation so as to meet the requirement of large deformation of broken surrounding rock; in addition, in order to solve the problem of low strength of broken surrounding rock, a grouting method is used for reinforcing the broken surrounding rock to improve the strength. However, during on-site construction operation, after a large amount of engineering grouting, the sections and the positions of the flow directions of the slurry are always unknown, namely, the local broken surrounding rock cannot be accurately reinforced, so that the grouting repair and reinforcement benefits of the surrounding rock are poor; moreover, the common end grouting reinforcement method in the construction site is limited by the grouting position and equipment, drilling holes are reserved after grouting, and after grouting is cured, even secondary drilling holes are needed, the anchor rod can be used for reinforcing and anchoring so as to ensure the supporting effect of the anchor rod on surrounding rock, the time is too long, the working procedure is complex, the working efficiency is low, the anchoring effect is influenced, and the feasibility of the site is extremely low. In contrast, the resin anchoring agent has short anchoring and curing time and better anchoring effect, and can overcome the defects. Based on the above problems, there is a need to develop an anchor rod device which not only can provide a constant supporting force to effectively control the deformation of surrounding rock, but also can perform sectional grouting to accurately repair surrounding rock cracks and strengthen broken surrounding rock, and can be anchored and grouting-reinforced by combining an anchoring agent, so that the anchor rod device can perform operations simultaneously, namely an anchor rod device integrating functions of diversity, constant resistance, reasonable structure, economy and applicability and deformation yielding functions so as to solve the existing engineering technical problems, and realize the integrated operation of anchoring and grouting of broken surrounding rock.
Disclosure of Invention
Technical problems: the invention aims to overcome the defects in the prior art and provides a porous yielding anchor rod device capable of grouting in sections and a use method thereof, which not only can provide constant supporting force to effectively control surrounding rock deformation, but also can perform grouting in sections to accurately repair surrounding rock cracks and strengthen broken surrounding rock, and can also perform anchoring and grouting reinforcement by combining an anchoring agent so as to simultaneously perform the operations.
The technical scheme is as follows: the invention relates to a porous yielding anchor rod device capable of grouting in a segmented way and a use method thereof, wherein the porous yielding anchor rod device comprises an anchor rod, and a sleeve is arranged on the anchor rod; the anchor rod comprises an anchor rod threaded section, an anchor rod hollow section and an anchor rod solid section, wherein the anchor rod threaded section is arranged at the end part of the anchor rod hollow section, the anchor rod threaded section is arranged at the tail part of the anchor rod hollow section, threads for installing a tray and an anti-slip screw nut are arranged on the anchor rod threaded section, a through hole penetrating through the anchor rod threaded section is axially formed in the anchor rod hollow section, a segmented grout stop plug, a limiter and a grouting steel pipe capable of moving in the through hole and sealing the through hole are arranged in the through hole, the segmented grout stop plug and the grouting steel pipe are respectively arranged at two ends of the limiter, steel wires extending to the outer side of the through hole are arranged on the segmented grout stop plug, a plurality of grouting holes communicated with the through hole are formed in the anchor rod hollow section at intervals, three circular isolation discs are arranged at intervals at the outer side of the anchor rod hollow section, the circular isolation discs are matched with the anchor holes in size, so that the space in the anchor hole is divided into a region I, a region II, a region III and a region IV, the region I is the space in which the anchor rod threaded section is located, the space in the region II and the region III is the space in which the anchor rod hollow section is located, and the segmented grout is injected into the region II or the region III as required. The tip of the solid section of stock is equipped with high strength nut through the screw thread, and sleeve cover is established at the solid section of whole stock, and the sleeve front end is equipped with the sealing disk that prevents rock soil broken bits and dust entering, and the inboard interval distance of sleeve is equipped with many rings and cooperates high strength nut to realize letting the plastic tooth of pressing.
Further, the grouting holes arranged on the hollow section of the anchor rod are 8-12 in number, and the grouting holes are arranged on the side wall of the hollow section of the anchor rod among the three circular isolation discs at equal intervals.
Further, an expanding agent or an annular plug for improving the sealing effect is arranged at the outer edge of the circular isolation, and the expanding agent is wrapped by a high-elasticity film and is provided with a time-delay expansion starting device.
Further, 4-6 plastic teeth are uniformly arranged on each section of the inner wall of the sleeve, and the plastic teeth have certain plasticity and deform under the extrusion of the high-strength nut.
Further, the circular isolation disc closest to the solid section of the anchor rod in the three circular isolation discs is arranged at the joint of the solid section of the anchor rod and the hollow section of the anchor rod, the end face of the circular isolation disc is provided with a cylindrical bulge which is used for being connected with and linked with the sleeve, and the cylindrical bulge is clamped in a reserved hole of the circular isolation disc, so that the sleeve can be guaranteed to rotate along with the anchor rod.
Further, the limiter is a bolt arranged on the connecting part of the area II and the area III on the hollow section of the anchor rod, the bolt is radially inserted into the hollow section of the anchor rod and fastened by a nut, and the moving range of the segmented grout stop plug and the grouting steel pipe can be limited.
Further, an annular grouting stop is arranged at the grouting steel pipe port, and the annular grouting stop can prevent slurry from flowing back during grouting.
The application method of the porous yielding anchor rod device capable of grouting in a segmented mode comprises the following steps:
constructing anchor holes in pre-calibrated positions of surrounding rocks, sliding an anchor rod solid section of an anchor rod into a sleeve, opening a sealing disc at the end part of the sleeve, and adding high-strength nuts on the anchor rod solid section according to threads on the side;
wrapping a high-elasticity film of an expanding agent around the peripheral groove of the circular isolation disc;
pushing a sectional grout stop plug connected with a steel wire to the bottom of a hollow section of the anchor rod by using a grouting steel pipe, and then installing a bolt and a nut;
feeding the anchoring agent cement cartridge, the curing agent cartridge and the anchor rod into the anchor hole;
starting a stirrer to drive the anchor rod to rotate and stir the anchoring agent cement cartridge and the curing agent cartridge to fully stir to form an anchoring agent cementing body, and linking the sleeve with the circular isolation disc through the cylindrical bulge; after the anchoring agent is solidified, sequentially sleeving a tray and an anti-skid screw nut on the screw thread section of the anchor rod exposed out of the anchor hole, and providing a pretightening force along a thread lead angle through pretightening the anti-skid screw nut;
when detecting that the part III of the area divided by the circular isolation disc is too many cracks or is in a rock stratum staggered zone, judging that grouting reinforcement is needed to be carried out on the part III; pushing the grouting steel pipe into a position with a bolt in the hollow section of the anchor rod, limiting the further pushing of the grouting steel pipe due to the blocking of the bolt, connecting the exposed tail end of the grouting steel pipe with a high-pressure grouting pump through a rubber catheter, starting the high-pressure grouting pump, injecting grout into a part III of an anchor hole region through a grouting hole, and repairing and reinforcing surrounding rock cracks of the part III;
and when grouting and reinforcing the part II of the area are needed, the steel wire is pulled to pull the segmented grout stop plug (26) to move, and the segmented grout stop plug (26) stops at the bolt due to the blocking of the bolt arranged in the hollow section of the anchor rod, so that the grouting steel pipe is pushed into the threaded section of the anchor rod for grouting, and only the surrounding rock crack of the part II of the reinforced area can be repaired.
When the surrounding rock is greatly deformed, the high-strength nut at the end part of the solid section of the anchor rod presses the plastic teeth on the inner wall of the sleeve, the plastic teeth are plastically deformed, and the high-strength nut is in sliding contact with the plastic teeth of the next section at the moment, so that the constant-resistance large deformation of the device is realized.
The beneficial effects are that: by adopting the technical scheme, the invention has the advantages of providing constant supporting force, generating larger elongation deformation to meet the requirement of large deformation of surrounding rock and realizing the function of repairing surrounding rock cracks and reinforcing broken surrounding rock by sectional grouting, thereby overcoming the defect that the conventional anchor rod cannot deform along with the surrounding rock, and overcoming the defect that slurry is lost after a large amount of grouting, and the surrounding rock cannot be reinforced accurately. The high-strength nut is used for providing constant resistance to the extrusion deformation of the plastic teeth, so that the high-strength nut can be deformed along with surrounding rock within an allowable range to meet the requirement of large deformation of the surrounding rock; the circular isolation disc can isolate the slurry and pull the sectional slurry stop plug when the slurry is injected into the anchor hole, so that the effect of selective sectional grouting is realized. The anchor rod device integrates multiple functions, solves the problem that a common anchor rod cannot meet the requirement of large deformation of surrounding rock, solves the problem that the manufacturing cost of the existing yielding anchor rod is too high, solves the problem that the existing grouting method is difficult to accurately reinforce the surrounding rock, repair cracks and reinforce the surrounding rock, and realizes the 'anchoring-grouting' integrated operation of crushing the surrounding rock. The invention has simple structure, low cost, stable function and simple working procedure, can greatly obtain the working efficiency, and the deformation and pressure-yielding function of the anchor rod can effectively reduce the occurrence of accidents and ensure the life safety of staff.
Drawings
FIG. 1 is a schematic view of an anchor hole in an embodiment of the present invention;
FIG. 2 is a schematic view of an anchoring device according to an embodiment of the present invention;
FIG. 3 is a schematic view of an installation of an anchoring device according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the yielding of the sleeve device according to the embodiment of the invention;
FIG. 5 (a) is a schematic diagram of grouting reinforcement of a surrounding rock area III in an embodiment of the present invention;
FIG. 5 (b) is a schematic diagram of grouting reinforcement of a portion II of a surrounding rock area according to an embodiment of the present invention;
FIG. 6 is an enlarged schematic view of a grouting steel pipe and a rubber conduit according to an embodiment of the invention;
FIG. 7 (a) is a schematic cross-sectional view of a bolt according to an embodiment of the present invention;
FIG. 7 (b) is a schematic cross-sectional view of a grouting hole according to an embodiment of the present invention;
FIG. 7 (c) is a schematic cross-sectional view of a plastic tooth in a sleeve according to an embodiment of the present invention;
FIG. 8 (a) is a schematic front view of a circular isolation disc according to an embodiment of the present invention;
fig. 8 (b) is a perspective view of a circular insulating disk according to an embodiment of the present invention.
In the figure: 1-surrounding rock, 2-anchor rod, 3-anti-slip screw nut, 4-tray, 5-crack, 6-anchor rod thread section, 7-anchor rod hollow section, 8-anchor rod solid section, 9-high strength nut, 10-round isolation disc, 11-expanding agent, 12-sleeve, 13-cylindrical bulge, 14-plastic tooth, 15-anchoring agent cementing body, 16-sealing disc, 17-grouting hole, 18-steel wire, 19-bolt, 20-nut, 21-grouting steel pipe, 22-rubber conduit, 23-anchor hole, 24-high elastic film, 25-annular grouting stopper, 26-segmented grouting stopper.
Detailed Description
The invention is further described below with reference to examples of embodiments in the accompanying drawings:
as shown in fig. 1 and 2, a porous yielding anchor device capable of grouting in a segmented mode comprises an anchor rod 2 and a sleeve 12, wherein the anchor rod 2 is divided into an anchor rod threaded section 6, an anchor rod hollow section 7 and an anchor rod solid section 8. The anchor rod thread section 6 is provided with threads, and a tray 4 and an anti-skid screw nut 3 are sequentially arranged on the threads; a circular isolation disc 10 is arranged on the hollow section 7 of the anchor rod, and the surrounding rock 1 can be divided into a region I, a region II, a region III and a region IV through the circular isolation disc 10; the solid anchor rod segment 8 extends into the sleeve 12. The anchor rod threaded section 6, the anchor rod hollow section 7 and the anchor rod solid section 8 are of an integrated structure and have the same outer diameter; 4 grouting holes 17 are formed in each section of the hollow anchor rod section 7 at intervals along the circumference, as shown in fig. 7 (b), the intervals between the sections are reasonable, and slurry can be injected into the anchor holes 23 from the grouting holes 17 during grouting, so that cracks 5 are repaired, and surrounding rock 1 is reinforced; the joint of the hollow section 7 of the anchor rod and the solid section 8 of the anchor rod is provided with a sectional grout stop 26 for stopping grout, the sectional grout stop 26 is connected with a steel wire 18, and the sectional grout stop 26 can be pulled to move by pulling the steel wire 18 outside the hole of the anchor hole 23. The bolt 19 and the nut 20 are arranged near the joint of the area II and the area III of the hollow anchor rod section 7, and when the segmented grout stop 26 is pulled by the steel wire 18, the segmented grout stop 26 slides to the bolt 19 to be clamped; the hollow section 7 of the anchor rod is also provided with a circular isolating disc 10, the whole body of which surrounds the expanding agent 11, and the expanding agent 11 is wrapped by a high-elasticity film 24. The circular isolation disc 10 can isolate the slurry when the slurry is injected into the anchor holes 23 so as to realize the effect of selective sectional grouting, the solid anchor rod section 8 penetrates into the sleeve 12, the end of the solid anchor rod section is provided with a high-strength nut 9 through threads, and the strength and the rigidity of the high-strength nut 9 are selected to be large enough. The yielding function is realized by the extrusion damage of the high-strength nut 9 to the plastic teeth 14 arranged on the inner wall of the sleeve 12.
As shown in fig. 3, the anchoring agent cement cartridge, the curing agent cartridge and the anchor rod 2 are fed into the anchor hole 23. Starting a stirrer to drive the anchor rod 2 to rotate and stir the anchoring agent cement cartridge and the curing agent cartridge to be fully stirred to form an anchoring agent colloid, and linking the sleeve 12 with the circular isolation disc 10 through the cylindrical bulge 13; after the anchoring agent is cured, the tray 4 and the anti-skid screw nut 3 are sequentially sleeved on the anchor rod thread section 6 exposed out of the anchor hole 23, and the pre-tightening force is provided along the thread lead angle by pre-tightening the anti-skid screw nut 3.
As shown in fig. 4, 4-6 plastic teeth 14 are uniformly arranged on each section of the inner wall of the sleeve 12, and the plastic teeth 14 are made of a material with certain plasticity and can be deformed under the extrusion of the high-strength nut 9, as shown in fig. 7 c. The sleeve 12 is provided with a sealing disc 16 at one side close to the bottom of the anchor hole 23 to prevent rock, soil and dust from entering; the other side of the circular isolation disc is provided with a cylindrical bulge 13, and the cylindrical bulge 13 is clamped in a reserved hole of the circular isolation disc 10, so that the sleeve 12 can be ensured to rotate along with the anchor rod 2; when the surrounding rock 1 is deformed, the high-strength nut 9 at the end part of the solid section 8 of the anchor rod presses the plastic teeth 14 on the inner wall of the sleeve 12, the plastic teeth 14 generate plastic deformation, and at the moment, the high-strength nut 9 slides to contact the plastic teeth 14 of the next section, so that the constant-resistance large deformation of the device is realized;
as shown in fig. 5 (a) and 5 (b), the surrounding rock 1 and the anchor hole 23 may be divided into a region I, a region II, a region III and a region IV according to the location of the circular insulating disc 10. When detecting that the crack of the part III of the area is more or the part III is in a rock stratum staggered zone, namely, the part III of the area needs to be grouting reinforced, the grouting steel pipe 21 can be pushed into the position provided with the bolt 19 in the hollow section 7 of the anchor rod, and the further pushing of the grouting steel pipe 21 is limited due to the blocking of the bolt 19, as shown in fig. 7 (a); when the area II needs to be partially grouting and reinforced, the steel wire 18 can be pulled to further pull the segmented grout stop 26 to move, and the segmented grout stop 26 stops at the bolt 19 due to the blocking of the bolt 19 arranged in the hollow section 7 of the anchor rod. At the moment, the grouting steel pipe 21 is pushed into the anchor rod threaded section 6 for grouting, so that the surrounding rock cracks 5 of the II part of the area can be reinforced; the grouting steel pipe 21 is formed by splicing various sections of steel pipes, and can also be connected with a rubber conduit 22. As shown in fig. 6, an annular grout stop 25 is provided at the mouth of the grouting pipe 21, and the annular grout stop 25 prevents the grout from flowing back during grouting.
As shown in fig. 8 (a) and 8 (b), the hollow section 7 of the anchor rod is further provided with a circular isolation disc 10 which surrounds the swelling agent 11 around the whole body, and the swelling agent 11 is wrapped by a high elastic film 24. The outer diameter of the circular isolation disc 10 is slightly smaller than the aperture of the anchor hole 23, and when the surrounding expanding agent 11 expands, the slurry can be isolated when the slurry is injected into the anchor hole 23, so that the effect of selective sectional grouting is realized.
Claims (9)
1. Porous pressure stock device that lets of can segmenting slip casting, its characterized in that: comprises an anchor rod (2), wherein a sleeve (12) is arranged on the anchor rod (2); the anchor rod (2) comprises an anchor rod threaded section (6), an anchor rod hollow section (7) and an anchor rod solid section (8) which are of an integrated structure and have the same outer diameter, wherein the anchor rod solid section (8) is arranged at the end part of the anchor rod hollow section (7), the anchor rod threaded section (6) is arranged at the tail part of the anchor rod hollow section (7), threads for installing the tray (4) and the anti-slip screw nut (3) are arranged on the anchor rod threaded section (6), a through hole penetrating through the anchor rod threaded section (6) is axially arranged in the anchor rod hollow section (7), a segmented grout stop plug (26), a limiter and a grouting steel pipe (21) which can move in the through hole and block the through hole are arranged in the through hole, the segmented grout stop plug (26) and the grouting steel pipe (21) are respectively arranged at the front side and the rear side of the limiter, the segmented grout stop plug (26) is provided with a steel wire (18) extending to the outer side of the through hole, a plurality of grouting holes (17) communicated with the through hole are formed in the hollow anchor rod section (7) at intervals, three circular isolation discs (10) are arranged in the hollow anchor rod section (7) at intervals, the sizes of the circular isolation discs (10) are matched with those of the anchor holes (23), so that the space in the anchor holes (23) is divided into a region I, a region II, a region III and a region IV, wherein the region I is a space where the threaded anchor rod section (6) is located, the region II and the region III are the space where the hollow anchor rod section (7) is located, the region IV is a space where the solid anchor rod section (8) is located, grouting the region II or the region III in a segmented manner according to the requirement; the tip of stock solid section (8) is equipped with high strength nut (9) through the screw thread, and sleeve (12) cover is established at whole stock solid section (8), and sleeve (12) front end is equipped with sealing disk (16) that prevent rock and soil broken bits and dust entering, and sleeve (12) inboard interval distance is equipped with many rings and cooperates high strength nut (9) to realize yielding plastic tooth (14).
2. The multi-hole yielding anchor device of sectional grouting as claimed in claim 1, wherein: the grouting holes (17) arranged on the anchor rod hollow section (7) are 8-12 in number, and are arranged on the side wall of the anchor rod hollow section (7) among the three circular isolation discs (10) at equal intervals.
3. The multi-hole yielding anchor device of sectional grouting as claimed in claim 1, wherein: the round isolated outer edge is provided with an expanding agent (11) or an annular plug for improving the sealing effect, and the expanding agent (11) is wrapped by a high-elasticity film (24) and is provided with a delay expansion starting device.
4. The multi-hole yielding anchor device of sectional grouting as claimed in claim 1, wherein: 4-6 plastic teeth (14) are uniformly arranged on each section of the inner wall of the sleeve (12), and the plastic teeth (14) have certain plasticity and deform under the extrusion of the high-strength nut (9).
5. The multi-hole yielding anchor device of sectional grouting as claimed in claim 1, wherein: the circular isolation disc (10) closest to the anchor rod solid section (8) in the three circular isolation discs (10) is arranged at the joint of the anchor rod solid section (8) and the anchor rod hollow section (7), the end face of the circular isolation disc (10) is provided with a cylindrical bulge (13) which is used for being connected with and linked with the sleeve (12), and the cylindrical bulge (13) is clamped in a reserved hole of the circular isolation disc (10) so as to ensure that the sleeve (12) rotates along with the anchor rod (2).
6. The multi-hole yielding anchor device of sectional grouting as claimed in claim 1, wherein: the limiter is a bolt (19) arranged on the connecting part of the area II and the area III of the hollow anchor rod section (7), the bolt (19) is radially inserted into the hollow anchor rod section (7) and fastened by a nut (20), and the limiter can limit the moving range of the segmented grouting plug (26) and the grouting steel pipe (21).
7. The multi-hole yielding anchor device of sectional grouting as claimed in claim 1, wherein: an annular slurry stop plug (25) is arranged at the opening of the grouting steel pipe (21), and the annular slurry stop plug (25) can prevent slurry from flowing back during grouting.
8. A method for using the porous yielding anchor rod device capable of grouting in a segmented manner according to the claims 1-7, which is characterized by comprising the following steps:
drilling anchor holes (23) at pre-calibrated positions of surrounding rock (1), sliding an anchor rod solid section (8) of an anchor rod (2) into a sleeve (12), opening a sealing disc (16) at the end part of the sleeve (12), and adding a high-strength nut (9) on the anchor rod solid section (8) by threads on the side;
wrapping a high-elasticity film (24) of an expanding agent (11) around the peripheral groove of the circular isolation disc (10);
pushing a segmented grout stop plug (26) connected with a steel wire (18) to the bottom of a hollow anchor rod section (7) by using a grouting steel pipe (21), and then installing a bolt (19) and a nut (20);
feeding the anchoring agent cement cartridge, the curing agent cartridge and the anchor rod (2) into an anchor hole (23);
starting a stirrer to drive the anchor rod (2) to rotate and stir the anchoring agent cement cartridge and the curing agent cartridge to be fully stirred to form an anchoring agent cementing body (15), and linking the sleeve (12) with the circular isolation disc (10) through the cylindrical bulge (13); after the anchoring agent is solidified, sequentially sleeving a tray (4) and an anti-skid thread nut (3) on an anchor rod thread section (6) exposed out of an anchor hole (23), and providing a pre-tightening force along a thread lead angle by pre-tightening the anti-skid thread nut (3);
when detecting that the part III of the area divided by the circular isolation disc (10) is too many due to cracks (5) or is in a rock stratum staggered zone, judging that grouting reinforcement is needed to be carried out on the part III; pushing the grouting steel pipe (21) into the position of the anchor rod hollow section (7) where the bolt (19) is arranged, limiting the further pushing of the grouting steel pipe (21) due to the blocking of the bolt (19), connecting the exposed tail end of the grouting steel pipe (21) with a high-pressure grouting pump through a rubber conduit (22), starting the high-pressure grouting pump, injecting grout into the area III of the anchor hole (23) through a grouting hole (17), and repairing and reinforcing the surrounding rock cracks (5) of the area III;
and when the grouting reinforcement of the part II is needed, the steel wire (18) is pulled to pull the segmented grout stop plug (26) to move, and the segmented grout stop plug (26) stops at the bolt (19) due to the blocking of the bolt (19) arranged in the hollow section (7) of the anchor rod, so that the grouting steel pipe (21) is pushed into the threaded section (6) of the anchor rod to perform grouting, and only the surrounding rock crack (5) of the part II is guaranteed to be repaired.
9. The method of use according to claim 8, wherein: when the surrounding rock (1) is greatly deformed, the high-strength nut (9) at the end part of the solid section (8) of the anchor rod presses the plastic teeth (14) on the inner wall of the sleeve (12), the plastic teeth (14) are plastically deformed, and at the moment, the high-strength nut (9) is in sliding contact with the plastic teeth (14) of the next section, so that the constant-resistance large deformation of the device is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310755034.0A CN116677436A (en) | 2023-06-25 | 2023-06-25 | Porous yielding anchor rod device capable of grouting in segmented mode and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310755034.0A CN116677436A (en) | 2023-06-25 | 2023-06-25 | Porous yielding anchor rod device capable of grouting in segmented mode and application method thereof |
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| CN116677436A true CN116677436A (en) | 2023-09-01 |
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| CN202310755034.0A Pending CN116677436A (en) | 2023-06-25 | 2023-06-25 | Porous yielding anchor rod device capable of grouting in segmented mode and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2023
- 2023-06-25 CN CN202310755034.0A patent/CN116677436A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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