CN109653782B - Grouting anchor rod grouting stopping device based on hydraulic expansion and construction method thereof - Google Patents
Grouting anchor rod grouting stopping device based on hydraulic expansion and construction method thereof Download PDFInfo
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- CN109653782B CN109653782B CN201910099472.XA CN201910099472A CN109653782B CN 109653782 B CN109653782 B CN 109653782B CN 201910099472 A CN201910099472 A CN 201910099472A CN 109653782 B CN109653782 B CN 109653782B
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- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 104
- 239000007924 injection Substances 0.000 claims abstract description 104
- 239000011440 grout Substances 0.000 claims abstract description 96
- 239000003921 oil Substances 0.000 claims description 158
- 239000010720 hydraulic oil Substances 0.000 claims description 78
- 238000005553 drilling Methods 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 31
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 239000011435 rock Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 238000004873 anchoring Methods 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 17
- 230000008093 supporting effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- 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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
Abstract
Grouting anchor rod grout stopping device based on hydraulic expansion and construction method thereof belong to the technical field of geotechnical engineering and mining engineering. The grouting anchor rod grouting device based on hydraulic expansion comprises a recyclable hydraulic expansion grouting plug and an injection return pump system, wherein the recyclable hydraulic expansion grouting plug comprises a grouting plug main body, the grouting plug main body is provided with a first through hole and a second through hole, the second through hole is connected with an injection return pipe of the injection return pump system through an injection return valve, the construction method of the grouting anchor rod grouting device based on hydraulic expansion comprises the steps of selecting the recyclable hydraulic expansion grouting plug, installing the recyclable hydraulic expansion grouting plug, fixing the recyclable hydraulic expansion grouting plug in a drill hole, and recovering the recyclable hydraulic expansion grouting plug. Grouting anchor rod grout stopping device based on hydraulic expansion and construction method thereof, and has the advantages of good grout stopping and blocking effect, controllable grout stopping capability, wide application range, simple structure, convenient operation and recycling.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering and mining engineering, in particular to a grouting anchor rod grouting stopping device based on hydraulic expansion and a construction method thereof.
Background
In the field of geotechnical engineering and mining engineering, the anchor bolt support is used as an effective surrounding rock support process and is widely applied to underground mines, tunnel engineering, open slope reinforcement and other geotechnical engineering, but the common anchor bolt support effect is poor for weak, broken and high-stress rock mass; the hollow grouting anchor bolt supporting process integrates the anchoring process and the grouting process, high-pressure cement slurry is injected into a drilled hole through a hollow anchor bolt, joint cracks in broken rock bodies are filled, the loose structure of surrounding rock is improved, the overall strength of the surrounding rock is improved, and the anchor bolt supporting effect is greatly improved.
For the grouting anchor bolt supporting technology, the current common grouting pressure is generally 5-10 MPa, the higher grouting pressure can ensure that the slurry generates a larger diffusion range in the broken rock mass, a better surrounding rock reinforcing and supporting effect is realized, but the grouting pressure is increased, and the higher requirement is put forward for a grouting stopping system: the good grout stopping system can effectively realize the blocking of the hole opening of the anchor rod drilling hole, improves the grouting pressure in the drilling hole, otherwise, the phenomena of grout overflow, grout leakage and grout spraying can occur in the grouting process, so that the grouting pressure in the drilling hole can not reach the design value, and the grouting supporting effect is greatly influenced.
At present, most common type grout stopping plugs are round table type rubber grout stopping plugs or round table type hard plastic grout stopping plugs, the small diameter end size of the common type grout stopping plugs is smaller than the drilling diameter, the large diameter end size of the common type grout stopping plugs is larger than the drilling diameter, the middle of the common type grout stopping plugs are provided with through holes for an anchor rod to pass through, and the common type grout stopping plugs easily have the following problems in the actual use process: (1) The deformation range of the grout stop plug is limited, the extrusion capability of the anchor rod and the borehole wall is limited, and the effective plugging of a hole with higher grouting pressure cannot be realized; (2) When the surrounding rock where the drilling hole is positioned is high in crushing degree and the drilling hole is not formed well, gaps are easily formed between the outer edges of the grout stop plugs and the wall of the drilling hole, and the leakage and the spraying of grout are caused because the gaps cannot be blocked; (3) The labor intensity of workers is high during construction, and particularly, when slurry stopping and plugging are performed on the hole opening of the upward anchor rod drilling, the operation is very inconvenient. In summary, in the grouting anchor bolt supporting process, the general grouting plug has the biggest problems of poor adaptability, incapability of providing a good plugging and grouting stopping effect for high-pressure grouting, even failure in grouting, and further scrapping of grouting drilling engineering, so that economic loss is caused, the supporting effect is directly influenced, and potential safety hazards are formed.
In order to solve the problems of the common type grout stop plug in engineering application, related researches are carried out: (1) The Chinese patent application CN 107654249A discloses a novel combined type grout stop plug for anchor rods and anchor cables, which consists of a central grout stop plug and end face grout stop plugs which are made of elastic materials, wherein the grout stop plugs are only improved on the basis of common grout stop plugs and still are limited by the deformation range and the plugging capability of the elastic materials, and the grout stop effect of the grout stop plugs can not meet the requirements for a high-pressure grouting process; (2) Chinese patent CN 102296603B discloses a grout stopping plug and a grout stopping system for an anchor rod (anchor rope), wherein rubber air bags arranged in an upper metal partition plate and a lower metal partition plate are taken as main bodies, the grout stopping plug needs to fix the anchor rod (anchor rope) and a grout stopping device into a whole in advance in the use process, and then the anchor rod (anchor rope) and the grout stopping device are integrally put into a drilling hole, so that the grouting stopper is limited by drilling equipment and technology, and the grouting stopper can not be implemented in construction sites of certain grouting anchor rod supporting engineering, so that the application range of the grouting stopper is limited; the slurry stopping system needs to be connected with a plurality of pipelines and observe a condition control valve in use, and the operation process is complex; the rubber air bag is filled with the slurry when the slurry stopping plug is used, the whole slurry stopping plug is firmly clamped in the drill hole under the action of collision deformation after the slurry is solidified, the slurry can not be recycled, even if the slurry stopping plug can be taken out of the drill hole, the slurry solidified in the slurry stopping plug can not be reused, and the cost is increased.
Disclosure of Invention
In order to solve the technical problems of poor grouting effect, small application range, complex structure and operation, non-recycling and the like of a grouting plug in the prior art, the invention provides a grouting anchor rod grouting device based on hydraulic expansion and a construction method thereof, and the grouting anchor rod grouting device has the advantages of good grouting plugging effect, controllable grouting capacity, wide application range, simple structure, convenience in operation, recycling and the like.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a grouting anchor rod grouting stopping device based on hydraulic expansion comprises a recyclable hydraulic expansion grouting stopping plug and an oil injection return pump system;
the recyclable hydraulic expansion grouting stop comprises a grouting stop main body, wherein the grouting stop main body is in a circular column shape, a hydraulic oil cavity is arranged between the inner wall and the outer wall of the grouting stop main body, a polytetrafluoroethylene film is arranged at the top end of the grouting stop main body, a first through hole and a second through hole are arranged at the bottom end of the grouting stop main body, the first through hole and the second through hole are communicated with the hydraulic oil cavity, the first through hole is connected with a safety valve, and the second through hole is connected with an oil injection and return valve;
the oil injection and return pump system comprises a pressure gauge, a regulating valve, an oil injection and return pipe and an oil injection and return pump, wherein the oil injection and return pump is connected with the oil injection and return valve through the oil injection and return pipe, and the pressure gauge and the regulating valve are arranged on the oil injection and return pipe;
the outer wall of the bottom end of the slurry stop plug main body is provided with a steel hoop;
the bottom symmetry of stopping thick liquid stopper main part is equipped with the steel and acts as go-between, the one end that the steel acted as go-between kept away from stopping thick liquid stopper main part is equipped with the pull ring.
The wall thickness of the top end of the main body of the grout stop plug and the wall thickness of the bottom end of the main body of the grout stop plug are 10-30mm.
The wall thickness of the side, close to the inner wall of the main body of the slurry stop plug, of the hydraulic oil cavity is 2-5mm, and the wall thickness of the side, close to the outer wall of the main body of the slurry stop plug, of the hydraulic oil cavity is 2-5mm.
The slurry stop plug main body is made of rubber.
The hydraulic oil cavity is in a circular column shape.
The regulating valve is located at one side close to the oil injection and return pump, and the pressure gauge is located at one side far away from the oil injection and return pump.
The oil injection and return pump is a manual oil pump or an electric oil pump.
The construction method of the grouting anchor rod grouting device based on hydraulic expansion comprises the following steps of:
firstly, selecting a recyclable hydraulic expansion grout stop plug which is adaptive to the size of a hollow grouting anchor rod and the size of a drilling hole, and connecting an oil injection and return valve at the bottom end of the recyclable hydraulic expansion grout stop plug with an oil injection and return pipe;
installing a recyclable hydraulic expansion grouting plug, namely enabling the top end of a grouting plug main body to face the direction of a hollow grouting anchor rod in a drill hole, sleeving an anchor rod through hole in the middle of the grouting plug main body along one end of the hollow grouting anchor rod exposed out of surrounding rock, placing the grouting plug in a drill hole opening, adjusting an oil injection and return pump to be in an oil injection state, opening a valve switch of an oil injection and return valve, injecting oil into a hydraulic oil cavity through the oil injection and return pump, and enabling the first side wall expansion of the recyclable hydraulic expansion grouting plug to extrude the hollow grouting anchor rod under the pressure of the hydraulic oil cavity, and enabling the second side wall expansion to extrude the inner wall of the drill hole to finish temporary anchoring of the hollow grouting anchor rod;
fixing the recoverable hydraulic expansion grouting stop plug in a drill hole, continuously injecting oil into the hydraulic oil cavity through an oil injection and return pump according to grouting pressure requirements, dynamically observing and controlling the pressure in the hydraulic oil cavity through a pressure gauge to enable the pressure to reach a design value, stopping injecting oil, closing a valve switch of an oil injection and return valve, adjusting the oil injection and return pump to be in an oil return state, discharging the pressure of an oil injection and return pipe, disconnecting the oil injection and return pipe from the oil injection and return valve, enabling the hydraulic oil cavity to be in a high pressure state at the moment, enabling the first side wall and the second side wall to generate deformation and radial extrusion force respectively under the expansion action of oil pressure, fixing the recoverable hydraulic expansion grouting stop plug in the drill hole, and achieving a high-pressure grouting and grouting function;
and fourthly, recovering the recoverable hydraulic expansion grouting plug, performing high-pressure grouting operation on the hollow grouting anchor rod, after grouting is completed, solidifying slurry in a drilled hole, connecting an oil injection and return pipe with an oil injection and return valve, opening a valve switch to enable hydraulic oil in a high-pressure state in a hydraulic oil cavity to flow back to the oil injection and return pump along the oil injection and return pipe, recovering the internal oil pressure of the hydraulic oil cavity to an initial state at the moment, closing the valve switch, disconnecting the connection between the oil injection and return pipe and the oil injection and return valve, and then pulling a pull ring at the bottom end of the recoverable hydraulic expansion grouting plug to enable the pull ring to drag a steel pull wire to take out the recoverable hydraulic expansion grouting plug from the drilled hole for recovery.
The invention has the beneficial effects that:
(1) The recoverable hydraulic expansion grout stop plug is made of rubber materials and is internally provided with a hydraulic oil cavity, and can generate larger elastic deformation and radial extrusion force under the action of high-pressure oil in the hydraulic oil cavity, so that effective grout stop is implemented on an anchor rod and a drill hole;
(2) The high-pressure radial extrusion force between the rubber material and the anchor rod and the borehole wall is used for generating larger axial friction force in a hydraulic expansion mode, and the hydraulic expansion type grouting anchor rod support device is suitable for grouting anchor rod support processes with various different grouting pressures;
(3) The invention has simple structure, simple and convenient operation, is not influenced by drilling equipment and grouting anchor rod technology during construction, and has low labor intensity of workers during construction;
(4) After the grouting process is finished, the recyclable hydraulic expansion grouting plug can be recycled through simple pipeline connection and operation, so that the cost in the grouting anchor rod supporting process is reduced, and the recycling rate of a grouting system is improved;
(5) According to the grouting pressure required by the hollow grouting anchor rod construction process, the pressure of the hydraulic oil cavity is controlled and regulated, and the application range is wide.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a grouting anchor rod grouting device based on hydraulic expansion;
FIG. 2 is a cross-sectional view of a recoverable hydraulic expandable grout stop plug provided by the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 in accordance with the present invention;
fig. 4 is a schematic diagram of the working state of the grouting anchor rod grout stop device in the drill hole based on hydraulic expansion.
In the figure, the 1-grout stop body, the 2-steel hoop, the 3-safety valve, the 4-grouting oil return valve, the 5-screwed joint, the 6-steel stay wire, the 7-pull ring, the 8-grouting oil return pipe, the 9-pressure gauge, the 10-regulating valve, the 11-grouting oil return pump, the 12-polytetrafluoroethylene film, the top end of the 13-grout stop body, the 14-second side wall, the 15-first side wall, the 16-hydraulic oil cavity, the bottom end of the 17-grout stop body, the 18-second through hole, the 19-internal thread, the 20-anchor rod through hole, the 21-first through hole, the 22-grouting oil return valve screwed joint, the 23-hollow grouting anchor rod, the 24-drilling inner wall, the 25-hydraulic oil and the 26-valve switch.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless specifically stated or limited otherwise, the terms "mounted," "configured with," "connected," and the like, are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In order to solve the problems in the prior art, as shown in fig. 1 to 4, the invention provides a grouting anchor rod grouting device based on hydraulic expansion, which comprises a recyclable hydraulic expansion grouting plug and an oil injection pump system; the recyclable hydraulic expansion slurry stop plug comprises a slurry stop plug main body 1, wherein the slurry stop plug main body 1 is made of rubber, the slurry stop plug main body 1 is in a circular column shape, a hydraulic oil cavity 16 is arranged between the inner wall and the outer wall of the slurry stop plug main body, the hydraulic oil cavity 16 is in a circular column shape, a polytetrafluoroethylene film 12 is arranged at the top end 13 of the slurry stop plug main body, a first through hole 21 and a second through hole 18 are arranged at the bottom end 17 of the slurry stop plug main body, the first through hole 21 and the second through hole 18 are communicated with the hydraulic oil cavity 16, the first through hole 21 is connected with a safety valve 3, and the second through hole 18 is connected with an oil injection return valve 4; the oil injection and return pump system comprises a pressure gauge 9, a regulating valve 10, an oil injection and return pipe 8 and an oil injection and return pump 11, wherein the oil injection and return pump 11 is connected with the oil injection and return valve 4 through the oil injection and return pipe 8, the pressure gauge 9 and the regulating valve 10 are arranged on the oil injection and return pipe 8, the regulating valve 10 is positioned on one side close to the oil injection and return pump 11, the pressure gauge 9 is positioned on one side far away from the oil injection and return pump 11, the wall thickness of the top end 13 of the grout stop main body and the wall thickness of the bottom end 17 of the grout stop main body are 10-30mm, the wall thickness of one side of the hydraulic oil cavity 16 close to the inner wall of the grout stop main body 1 is 2-5mm, and the wall thickness of one side of the hydraulic oil cavity 16 close to the outer wall of the grout stop main body 1 is 2-5mm.
In this embodiment, as shown in fig. 1, i is a recoverable hydraulic expansion stopper, and ii is an injection return pump system. As shown in fig. 2 and 3, the through hole in the center of the grout stop main body 1 is an anchor rod through hole 20, when grout stop is performed, a hollow grouting anchor rod 23 passes through the grout stop main body 1, the two ends of the grout stop main body 1 are respectively the top end and the bottom end of the grout stop main body, the wall thickness of the top end 13 and the bottom end of the grout stop main body is 20mm, the wall thickness of the top end 13 and the bottom end of the grout stop main body is large, so that the grout stop main body is not easy to deform when being acted by oil pressure in a hydraulic oil cavity 16, the wall thickness of the side of the hydraulic oil cavity 16, close to the inner wall of the grout stop main body 1, is 3mm, namely, the wall thickness of the side of the hydraulic oil cavity 16, close to the outer wall of the grout stop main body 1, is 3mm, namely, the wall thickness of the second side wall 14 in fig. 2 is small, the wall thickness of the first side wall 15 and the second side wall 14 is relatively easy to deform when being acted by oil pressure in the hydraulic oil cavity 16, the anchor rod is deformed and extruded, the wall thickness of the second side wall 14 is relatively large, so that the wall 24 is relatively good grout stop blocking effect is achieved, when the grout stop main body is constructed, the top end 13 of the grout stop main body is located in a drilling hole, the wall is 3mm is close to the direction of the inner wall of the grout stop main body, the grout is repeatedly used, the grout stop main body, and the grout is filled into the grout, and the grout is repeatedly, and the grout is filled in the direction, and the grout stop film is and the grout is recovered, and the grout is filled, and after the grout is and is recycled. The hydraulic oil cavity 16 is a cylindrical cavity for containing hydraulic oil 25, during construction, the initial state of the internal oil pressure of the hydraulic oil cavity 16 is a state full of the hydraulic oil 25, namely the internal pressure of the hydraulic oil cavity 16 is the same as the atmospheric pressure, the grout stop main body 1 is free from deformation, the hydraulic oil 25 in the hydraulic oil cavity 16 has no pressure on the recoverable hydraulic expansion grout stop, and no exhaust operation is needed during oiling and pressurization. The inner walls of the first through hole 21 and the second through hole 18 are respectively provided with an internal thread 19, the first through hole 21 is in threaded connection with the safety valve 3, namely, the safety valve 3 is used for preventing the pressure in the hydraulic oil cavity 16 from being too high to damage the recoverable hydraulic expansion slurry stop plug, and the pressure relief protection function is realized through the safety valve 3 before the internal pressure of the hydraulic oil cavity 16 reaches the limit damage value; the second through hole 18 is in threaded connection with the oil filling and returning valve 4, that is, the oil filling and returning valve threaded joint 22 is screwed into the second through hole 18 to connect the oil filling and returning valve 4, the oil filling and returning valve 4 is used for controlling and maintaining the state of hydraulic oil 25 in the hydraulic oil cavity 16, the oil filling and returning valve 4 is provided with a valve switch 26, the hydraulic oil cavity 16 is communicated with the oil filling and returning pump 11 when the valve switch 26 is opened, the oil filling and pressurizing state or the oil returning pressure relief state is achieved, and the hydraulic oil cavity 16 is kept in a stable state when the valve switch 26 is closed, so that the valve switch 26 is normally in a closed state.
In this embodiment, the oil injection and return pump 11 is a manual oil pump or an electric oil pump, and is mainly used for injecting hydraulic oil 25 into the hydraulic oil chamber 16 to reach a required pressure, or for returning and releasing the hydraulic oil 25 in a high-pressure state in the hydraulic oil chamber 16 to atmospheric pressure. The regulating valve 10 is located near one side of the oil filling and returning pump 11, the pressure gauge 9 is located far away from one side of the oil filling and returning pump 11, the pressure gauge 9 is used for dynamically observing the pressure state of hydraulic oil 25 in the hydraulic oil cavity 16, a valve switch 26 on the oil filling and returning valve 4 is controlled through reading in the pressure gauge 9, and then the regulation of the pressure in the hydraulic oil cavity 16 is achieved, and the regulating valve 10 is located between the oil filling and returning pump 11 and the pressure gauge 9 and used for regulating whether the oil filling and returning pump 11 is in a working state of filling, pressing or returning and pressure relief. The outer wall of the bottom end 17 of the slurry stop plug main body is provided with the steel hoop 2, the radial outer wall of the bottom end 17 of the slurry stop plug main body is provided with the steel hoop 2, the steel hoop 2 can limit the recoverable hydraulic expansion slurry stop plug to deform when the hydraulic oil cavity 16 is filled with oil and is pressurized, and oil leakage phenomenon is avoided at the junction of the first through hole 21 and the safety valve 3 and the junction of the second through hole 18 and the oil filling and returning valve 4. The bottom 17 symmetry of stopping the thick liquid stopper main part is equipped with steel and acts as go-between 6, and the one end that the steel was acted as go-between 6 was kept away from and is stopped thick liquid stopper main part 1 is equipped with pull ring 7, and the steel is acted as go-between 6 and is close to the central point of stopping the bottom 17 of thick liquid stopper main part, and after high-pressure grouting operation ended and thick liquid solidification, recoverable hydraulic expansion stopped thick liquid stopper was pulled out from the drilling and is retrieved reuse through steel and pull ring 7, and the top 13 of stopping the thick liquid stopper main part is equipped with polytetrafluoroethylene film 12 and the steel that its bottom was equipped with acts as go-between 6 and pull ring 7 cooperation, realizes recoverable hydraulic expansion and stops the reuse of thick liquid stopper.
The construction method of the grouting anchor rod grouting device based on hydraulic expansion comprises the following steps of:
firstly, selecting a recyclable hydraulic expansion grout stop plug which is suitable for the size of a hollow grouting anchor rod 23 and the size of a drilling hole, and connecting an oil injection and return valve 4 at the bottom end of the recyclable hydraulic expansion grout stop plug with an oil injection and return pipe 8;
installing a recoverable hydraulic expansion grouting plug, namely enabling the top end 13 of the grouting plug main body to face the direction of a hollow grouting anchor rod 23 in a drilled hole, sleeving an anchor rod through hole 20 in the middle of the grouting plug main body 1 along one end of the hollow grouting anchor rod 23 exposed out of surrounding rock, placing the grouting plug in a hole of the drilled hole, adjusting an oil injection and return pump 11 to be in an oil injection state, opening a valve switch 26 of an oil injection and return valve 4, injecting oil into a hydraulic oil cavity 16 through the oil injection and return pump 11, expanding a recoverable hydraulic expansion grouting plug first side wall 15 to extrude the hollow grouting anchor rod 23 under the pressure action of the hydraulic oil cavity 16, and expanding a second side wall 14 to extrude a drill hole inner wall 24 to finish temporary anchoring of the hollow grouting anchor rod 23;
fixing the recoverable hydraulic expansion grouting stop plug in a drill hole, continuously injecting oil into the hydraulic oil cavity 16 through the oil injection and return pump 11 according to grouting pressure requirements, dynamically observing and controlling the pressure in the hydraulic oil cavity 16 through the pressure gauge 9 to enable the pressure to reach a design value, stopping injecting oil, closing a valve switch 26 of the oil injection and return valve 4, adjusting the oil injection and return pump 11 to be in an oil return state, discharging the pressure of the oil injection and return pipe 8, disconnecting the oil injection and return pipe 8 from the oil injection and return valve 4, wherein the hydraulic oil cavity 16 is in a high pressure state at the moment, under the expansion action of oil pressure, respectively generating deformation and radial extrusion force by the first side wall 15 and the second side wall 14, and fixing the recoverable hydraulic expansion grouting stop plug in the drill hole to realize a high-pressure grouting stop function;
and fourthly, recovering the recoverable hydraulic expansion grouting plug, performing high-pressure grouting operation on the hollow grouting anchor rod 23, after grouting is completed, solidifying slurry in a drilled hole, connecting the oil injection and return pipe 8 with the oil injection and return valve 4, opening the valve switch 26, enabling hydraulic oil 25 in a high-pressure state in the hydraulic oil cavity 16 to flow back to the oil injection and return pump 11 along the oil injection and return pipe 8, recovering the internal oil pressure of the hydraulic oil cavity 16 to an initial state, closing the valve switch 26, disconnecting the oil injection and return pipe 8 from the oil injection and return valve 4, and then pulling the pull ring 7 at the bottom end of the recoverable hydraulic expansion grouting plug, so that the recoverable hydraulic expansion grouting plug is taken out from the drilled hole and recovered by pulling the steel pull wire 6.
In this embodiment, in the construction process, as shown in fig. 4, P is the pressure acting in the hydraulic oil chamber 16, first, drilling a grouting anchor rod hole with a corresponding aperture and depth at a position where grouting anchor rod support is required, inserting a hollow grouting anchor rod 23 into the hole until the hole bottom, and positioning the hollow grouting anchor rod 23 at one end inside the drilling hole, wherein end anchoring can be performed by adopting a resin cartridge or a simple anchor head, or anchoring can be temporarily omitted; secondly, selecting a recyclable hydraulic expansion grout stop plug, selecting a recyclable hydraulic grout stop plug which has an inner anchor rod through hole 20 with a diameter slightly larger than that of a hollow grouting anchor rod 23 and an outer diameter slightly smaller than that of a drilling hole and is matched with the size of the hollow grouting anchor rod 23 and the size of the drilling hole, and connecting an oil injection and return valve 4 with an oil injection and return pipe 8 of an oil injection and return pump 11 through a threaded joint 5 in a threaded locking connection mode; then, installing a recyclable hydraulic expansion grout stop plug, sleeving a bolt through hole 20 in the middle of the grout stop plug main body 1 along a hollow grouting bolt 23 along one end of the bolt exposed out of surrounding rock towards the bolt direction in a drilling hole, adjusting the grouting return pump 11 to be in an oiling state, opening an grouting return valve 4 at the bottom end of the grout stop plug, oiling a hydraulic oil cavity 16 in the recyclable hydraulic expansion grout stop plug through the grouting return pump 11, expanding a first side wall 15 of the recyclable hydraulic expansion grout stop plug to extrude the bolt under the pressure of the hydraulic oil cavity 16, expanding a second side wall 14 to extrude the inner wall 24 of the drilling hole, and if no end anchoring is carried out in the drilling hole, realizing temporary anchoring of the bolt in the drilling hole through the recyclable hydraulic expansion grout stop plug so as to prevent the hollow grouting bolt 23 from falling off from the drilling hole, fixing the hollow grouting bolt 23 in the drilling hole, and then firmly fixing the recyclable hydraulic expansion grout stop plug in the drilling hole according to grouting pressure requirements; further, fixing the recyclable hydraulic expansion grouting stop in a drill hole, continuously injecting oil into a hydraulic oil cavity 16 in the recyclable hydraulic expansion grouting stop through an oil injection and return pump 11 according to grouting pressure requirements of a grouting anchor bolt support process, dynamically observing and controlling the pressure in the hydraulic oil cavity 16 through a pressure gauge 9 to enable the pressure to reach a design value, stopping injecting oil, closing an oil injection and return valve 4 at the bottom end 17 of a grouting stop main body, adjusting the oil injection and return pump 11 to an oil return state, discharging the pressure of an oil injection and return pipe 8, disconnecting the connection between the oil injection and return pipe 8 and the oil injection and return valve 4, wherein the hydraulic oil cavity 16 in the recyclable hydraulic expansion grouting stop is in a high pressure state at the moment, and under the expansion action of oil pressure, respectively generating deformation and radial extrusion force on a first side wall 15 and a second side wall 14 of the recyclable hydraulic expansion grouting stop is firmly fixed in the drill hole, so that a high-pressure grouting stop function is realized; further, the recyclable hydraulic expansion grouting stopper is recycled, high-pressure grouting operation is carried out on the hollow grouting anchor rod 23 according to grouting anchor rod support design requirements, after grouting is completed, after grouting in a drilling hole is solidified, the grouting oil return pipe 8 on the grouting oil return pump 11 and the grouting oil return valve 4 at the bottom end 17 of the grouting stopper main body are reconnected, a valve switch 26 is opened, hydraulic oil 25 in a high-pressure state in the hydraulic oil cavity 16 flows back to the grouting oil return pump 11 along the grouting oil return pipe 8, at the moment, the oil pressure in the hydraulic oil cavity 16 is restored to an initial state, the grouting oil return valve 4 is closed, the connection between the grouting oil return pipe 8 and the grouting oil return valve 4 is disconnected, and then a pull ring 7 of the recyclable hydraulic expansion grouting stopper is pulled, so that the recyclable hydraulic expansion grouting stopper is taken out of the drilling hole and recycled by pulling steel wire 6; and finally, finishing the construction, namely installing a tray at one end of the anchor rod exposed out of the surrounding rock, and screwing up a pre-tightening nut to finish the grouting anchor rod construction process.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The grouting anchor rod grouting stopping device based on hydraulic expansion is characterized by comprising a recyclable hydraulic expansion grouting stopping plug and an oil injection return pump system;
the recyclable hydraulic expansion grouting stop comprises a grouting stop main body, wherein the grouting stop main body is in a circular column shape, a hydraulic oil cavity is arranged between the inner wall and the outer wall of the grouting stop main body, a polytetrafluoroethylene film is arranged at the top end of the grouting stop main body, a first through hole and a second through hole are arranged at the bottom end of the grouting stop main body, the first through hole and the second through hole are communicated with the hydraulic oil cavity, the first through hole is connected with a safety valve, and the second through hole is connected with an oil injection and return valve;
the oil injection and return pump system comprises a pressure gauge, a regulating valve, an oil injection and return pipe and an oil injection and return pump, wherein the oil injection and return pump is connected with the oil injection and return valve through the oil injection and return pipe, and the pressure gauge and the regulating valve are arranged on the oil injection and return pipe;
the outer wall of the bottom end of the slurry stop plug main body is provided with a steel hoop;
the bottom symmetry of stopping thick liquid stopper main part is equipped with the steel and acts as go-between, the one end that the steel acted as go-between kept away from stopping thick liquid stopper main part is equipped with the pull ring.
2. The grouting bolt grout stopping device based on hydraulic expansion of claim 1, wherein the wall thickness of the top end of the grout stopping main body and the bottom end of the grout stopping main body is 10-30mm.
3. The grouting anchor rod grout stopping device based on hydraulic expansion according to claim 1, wherein the wall thickness of the side, close to the inner wall of the main body of the grout stopping plug, of the hydraulic oil cavity is 2-5mm, and the wall thickness of the side, close to the outer wall of the main body of the grout stopping plug, of the hydraulic oil cavity is 2-5mm.
4. The grouting bolt grout stopping device based on hydraulic expansion of claim 1, wherein the grout stopping plug body is made of rubber.
5. The grouting anchor grout stopping device based on hydraulic expansion of claim 1, wherein the hydraulic oil cavity is in a circular column shape.
6. A grouting anchor rod grout stop based on hydraulic expansion as claimed in claim 1, wherein the regulating valve is located on the side close to the injection return pump and the pressure gauge is located on the side remote from the injection return pump.
7. The grouting anchor grout stopping device based on hydraulic expansion of claim 1, wherein the oil injection return pump is a manual oil pump or an electric oil pump.
8. The construction method of the grouting anchor rod grouting stopping device based on hydraulic expansion as claimed in claim 1, which is characterized by comprising the following steps:
firstly, selecting a recyclable hydraulic expansion grout stop plug which is adaptive to the size of a hollow grouting anchor rod and the size of a drilling hole, and connecting an oil injection and return valve at the bottom end of the recyclable hydraulic expansion grout stop plug with an oil injection and return pipe;
installing a recyclable hydraulic expansion grouting plug, namely enabling the top end of a grouting plug main body to face the direction of a hollow grouting anchor rod in a drill hole, sleeving an anchor rod through hole in the middle of the grouting plug main body along one end of the hollow grouting anchor rod exposed out of surrounding rock, placing the grouting plug in a drill hole opening, adjusting an oil injection and return pump to be in an oil injection state, opening a valve switch of an oil injection and return valve, injecting oil into a hydraulic oil cavity through the oil injection and return pump, and enabling the first side wall expansion of the recyclable hydraulic expansion grouting plug to extrude the hollow grouting anchor rod under the pressure of the hydraulic oil cavity, and enabling the second side wall expansion to extrude the inner wall of the drill hole to finish temporary anchoring of the hollow grouting anchor rod;
fixing the recoverable hydraulic expansion grouting stop plug in a drill hole, continuously injecting oil into the hydraulic oil cavity through an oil injection and return pump according to grouting pressure requirements, dynamically observing and controlling the pressure in the hydraulic oil cavity through a pressure gauge to enable the pressure to reach a design value, stopping injecting oil, closing a valve switch of an oil injection and return valve, adjusting the oil injection and return pump to be in an oil return state, discharging the pressure of an oil injection and return pipe, disconnecting the oil injection and return pipe from the oil injection and return valve, enabling the hydraulic oil cavity to be in a high pressure state at the moment, enabling the first side wall and the second side wall to generate deformation and radial extrusion force respectively under the expansion action of oil pressure, fixing the recoverable hydraulic expansion grouting stop plug in the drill hole, and achieving a high-pressure grouting and grouting function;
and fourthly, recovering the recoverable hydraulic expansion grouting plug, performing high-pressure grouting operation on the hollow grouting anchor rod, after grouting is completed, solidifying slurry in a drilled hole, connecting an oil injection and return pipe with an oil injection and return valve, opening a valve switch to enable hydraulic oil in a high-pressure state in a hydraulic oil cavity to flow back to the oil injection and return pump along the oil injection and return pipe, recovering the internal oil pressure of the hydraulic oil cavity to an initial state at the moment, closing the valve switch, disconnecting the connection between the oil injection and return pipe and the oil injection and return valve, and then pulling a pull ring at the bottom end of the recoverable hydraulic expansion grouting plug to enable the pull ring to drag a steel pull wire to take out the recoverable hydraulic expansion grouting plug from the drilled hole for recovery.
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| CN201910099472.XA CN109653782B (en) | 2019-01-31 | 2019-01-31 | Grouting anchor rod grouting stopping device based on hydraulic expansion and construction method thereof |
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| CN201910099472.XA CN109653782B (en) | 2019-01-31 | 2019-01-31 | Grouting anchor rod grouting stopping device based on hydraulic expansion and construction method thereof |
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| KR20090024434A (en) * | 2007-09-04 | 2009-03-09 | 김용기 | Limit expansion packer, anchoring method using pressing and reaming & water stopping anchoring method using pressing |
| CN102296603A (en) * | 2011-06-02 | 2011-12-28 | 北京科技大学 | Grouting-stopping plug and system for anchor rod (anchor cable) |
| CN105089687A (en) * | 2015-09-26 | 2015-11-25 | 王新丰 | Bolt-grouting supporting process system |
| CN209586404U (en) * | 2019-01-31 | 2019-11-05 | 丹东丹银矿冶有限责任公司 | A kind of grouted anchor bar slurry stop based on hydraulic dilatation |
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2019
- 2019-01-31 CN CN201910099472.XA patent/CN109653782B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090024434A (en) * | 2007-09-04 | 2009-03-09 | 김용기 | Limit expansion packer, anchoring method using pressing and reaming & water stopping anchoring method using pressing |
| CN102296603A (en) * | 2011-06-02 | 2011-12-28 | 北京科技大学 | Grouting-stopping plug and system for anchor rod (anchor cable) |
| CN105089687A (en) * | 2015-09-26 | 2015-11-25 | 王新丰 | Bolt-grouting supporting process system |
| CN209586404U (en) * | 2019-01-31 | 2019-11-05 | 丹东丹银矿冶有限责任公司 | A kind of grouted anchor bar slurry stop based on hydraulic dilatation |
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