CN109083666B - Grouting anchor rod structure and construction method thereof - Google Patents
Grouting anchor rod structure and construction method thereof Download PDFInfo
- Publication number
- CN109083666B CN109083666B CN201810797249.8A CN201810797249A CN109083666B CN 109083666 B CN109083666 B CN 109083666B CN 201810797249 A CN201810797249 A CN 201810797249A CN 109083666 B CN109083666 B CN 109083666B
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- grouting
- anchor
- anchor hole
- rod body
- rod
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- 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
Abstract
The invention provides a slip casting anchor rod and a construction method thereof, wherein the slip casting anchor rod comprises a rod body, a tray, a locking nut, a self-locking ring, a positioning plug and a consolidation body, wherein an anchor hole is drilled in a rock body, the self-locking ring is arranged on the anchor rod body, one end of the rod body extends into the anchor hole, the other end of the rod body passes through the positioning plug, the tray and the locking nut to be screwed, the tray is covered at the port of the anchor hole, and the consolidation body is filled in a gap between the rod body and the inner wall of the anchor hole; the construction method comprises the steps of preparing a grouting pipe, digging an anchor hole, installing a rod body, preparing grouting material, connecting the grouting pipe and grouting into a gap between the anchor hole and the rod body through the grouting pipe. By adopting the technical scheme of the invention, the self-locking ring is arranged on the rod body, so that the injected grouting material is more uniformly distributed in the anchor hole and then is condensed, the slurry is effectively prevented from overflowing from the anchor hole, the rod body is more tightly connected with the surrounding rock, the supporting strength and effect of the anchor rod are improved, and the potential safety hazard is reduced.
Description
Technical Field
The invention belongs to the technical field of mine engineering and civil engineering geotechnical support, and particularly relates to a grouting anchor rod structure and a construction method thereof.
Background
At present, technical equipment such as anchor rods, anchor cables and the like are widely applied to supporting operation of mining engineering, wherein in the process of anchor rod supporting operation, in order to increase the supporting strength of the anchor rods and reduce the construction cost of the anchor rods, a grouting anchor rod structure and a construction method thereof are commonly used for replacing the supporting process of solid anchor rods. However, in the construction process of the existing grouting anchor rod structure and the construction method thereof, when slurry is injected, the slurry often falls under the action of gravity of the slurry before solidification and flows out along the anchor hole, so that the slurry cannot be densely filled in a gap between the rod body and the anchor hole, the anchor rod supporting effect is influenced, and potential safety hazards are brought to roadway supporting.
Disclosure of Invention
In order to solve the technical problem, the invention provides a grouting anchor rod structure and a construction method thereof.
The invention is realized by the following technical scheme.
The invention provides a grouting anchor rod structure and a construction method thereof, wherein the grouting anchor rod structure comprises a hollow rod body, a tray, a locking nut, a self-locking ring, a positioning plug and a consolidation body, an anchor hole is drilled in a rock body, the self-locking ring is installed on the rod body, one end of the rod body extends into the anchor hole, the other end of the rod body sequentially penetrates through the positioning plug, the tray and the locking nut to be screwed, the tray is covered at the port of the anchor hole, and the consolidation body is filled in a gap between the rod body and the inner wall of the anchor hole.
The length of the part of the rod body exposed out of the anchor hole port is not more than 150 mm.
The self-locking ring comprises a connecting part connected with the rod body and a hollow horn-shaped clamping ring in sliding fit with the inner wall of the anchor hole.
The hollow horn-shaped clamp ring is formed by welding a steel plate with the thickness of 2-3.0 mm around the edge of the connecting part.
The outer peripheral surface of the hollow horn-shaped clamp ring is also uniformly provided with a plurality of flow-limiting grooves with the width of 5 mm-10 mm.
The difference between the outer diameter of the lower end of the hollow horn-shaped clamping ring and the inner diameter of the anchor hole is 2-4 mm.
In addition, the invention also provides a construction method using the construction of the grouting anchor rod, which comprises the following steps:
the method comprises the following steps: providing a grouting pipe, wherein the grouting pipe is made of a steel pipe;
step two: adopting rock drilling equipment to drill anchor holes on the inner wall of the tunnel, and then using compressed air or water to remove all impurities in the anchor holes;
step three: using a grouting bolt structure according to any one of claims 1 to 12, screwing the self-locking ring to the head end of the rod body, inserting the rod body into the bolt hole by using a bolting machine so that the end of the rod body is 50mm to 100mm away from the bottom wall of the bolt hole, sleeving a positioning plug, a tray and a locking nut in sequence at the tail end of the rod body, and screwing the locking nut so that the tray covers the port of the bolt hole and the positioning plug is accommodated in the bolt hole;
step four: preparing grouting material: putting a proper amount of magnesium phosphate cement, an additive, an admixture, aggregate and water into a stirrer to be stirred for 2-3 min to obtain a grouting material;
step five: sequentially penetrating the grouting pipe in the first step through the tray and the positioning plug and then extending into the anchor hole;
step six: and D, putting the grouting material obtained in the step four into grouting equipment, enabling the output end of the grouting equipment to be connected with the tail end of the rod body or the grouting pipe according to the extending direction of the anchor hole in the rock body in the step two, starting the grouting equipment, grouting into the anchor hole through the grouting equipment, sealing the tail end of the rod body by using a plug when the grouting material is filled in the anchor hole, stopping grouting, and forming a solidified body after the grouting material is solidified.
And in the second step, the distance between the mounting position of the self-locking ring and the head end of the rod body is 200-300 mm.
When the length of the rod body is larger than 2500mm, the number of the self-locking rings is multiple, and the distance between any two adjacent self-locking rings is 2000-3000 mm.
And sixthly, when the anchor hole extends upwards relative to the horizontal plane in the rock body, the output end of the grouting equipment is communicated with the grouting pipe, and when the anchor hole extends downwards relative to the horizontal plane in the rock body, the output end of the grouting equipment is communicated with the rod body.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the self-locking ring is arranged on the rod body, when slurry is injected into the gap between the rod body of the anchor rod and the inner wall of the anchor hole, the slurry can only flow through the gap between the snap rings on the self-locking ring, so that the flow limiting effect is generated on the slurry, the slurry is prevented from flowing out to the port of the anchor hole before the slurry is solidified, so that the slurry is tightly filled, part of the slurry flowing through the gap between the snap rings reaches the head end of the rod body, the self-locking ring is pushed to move downwards under the action of the gravity of the slurry, and when the slurry acting force on two sides of the self-locking ring reaches the balance, the self-locking ring stops moving, so that the slurry is more uniformly distributed in the gap between the rod body and the inner wall of the anchor hole, in addition, the anchor hole is also provided with the positioning plug, the slurry is further effectively prevented from falling out, and finally the rod body is bonded with, the potential safety hazard is reduced. Furthermore, the grouting material is made of phosphorus-magnesium materials, the application range of the phosphorus-magnesium materials is expanded, the setting time is 10-25 min, the grouting material has the characteristics of short setting time, strong compression resistance, good bonding performance and the like, the external load borne by the grouting material can reach more than 1.5MPa, the anchor rod body and the surrounding rock anchor hole are effectively consolidated together, and the supporting effect is improved.
Drawings
FIG. 1 is a flow chart of the construction process of the grouting anchor rod structure of the present invention;
fig. 2 is a structural schematic of the present invention grouting bolt construction;
FIG. 3 is a front view of the self-locking ring of the present invention;
FIG. 4 is a top view of the self-locking ring of the present invention;
FIG. 5 is a schematic diagram of the retaining ring of the present invention.
In the figure: 1-anchor hole, 2-rod body, 3-tray, 4-lock nut, 5-self-locking ring, 6-grouting pipe, 7-consolidation body, 8-positioning plug, 9-positioning ring, 10-plug, 201-air hole, 501-connecting part, 502-clamping ring, 901-outer ring, 902-inner ring, 903-spoke.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, 2 and 3, the invention provides a grouting anchor rod structure and a construction method thereof, the grouting anchor rod structure comprises a hollow rod body 2, a tray 3, a locking nut 4, a self-locking ring 5, a positioning plug 8 and a consolidation body 7, an anchor hole 1 is cut on a rock body, the self-locking ring 5 is installed on the rod body 2, one end of the rod body 2 extends into the anchor hole 1, the other end of the rod body 2 sequentially passes through the positioning plug 8, the tray 3 and the locking nut 4 to be screwed, the tray 3 is covered on the port of the anchor hole 1, and the consolidation body 7 is filled in a gap between the rod body 2 and the inner wall of the anchor hole 1. The grouting material is injected into the space between the inner wall of the anchor hole 1 and the rod body 2 through the grouting pipe 6, and after the grouting material 7 is condensed, the inner wall of the anchor hole is bonded with the rod body 2, so that the supporting strength of the anchor rod is enhanced.
By adopting the technical scheme of the invention, the self-locking ring is arranged on the rod body, when slurry is injected into the gap between the rod body of the anchor rod and the inner wall of the anchor hole, the slurry can only flow through the gap between the snap rings on the self-locking ring, so that the flow limiting effect is generated on the slurry, the slurry is prevented from flowing out to the port of the anchor hole before the slurry is solidified, so that the slurry is tightly filled, part of the slurry flowing through the gap between the snap rings reaches the head end of the rod body, the self-locking ring is pushed to move downwards under the action of the gravity of the slurry, and when the slurry acting force on two sides of the self-locking ring reaches the balance, the self-locking ring stops moving, so that the slurry is more uniformly distributed in the gap between the rod body and the inner wall of the anchor hole, in addition, the anchor hole is also provided with the positioning plug, the slurry is further effectively prevented from falling out, and finally the rod body is bonded with, the potential safety hazard is reduced. Furthermore, the grouting material is made of phosphorus-magnesium materials, the application range of the phosphorus-magnesium materials is expanded, the setting time is 10-25 min, the grouting material has the characteristics of short setting time, strong compression resistance, good bonding performance and the like, the external load borne by the grouting material can reach more than 1.5MPa, the anchor rod body and the surrounding rock anchor hole are effectively consolidated together, and the supporting effect is improved.
Further, the rod body 2 can be replaced by a hollow full-thread steel pipe. The length of the part of the rod body 2 exposed out of the port of the anchor hole 1 is not more than 150 mm. Further, the distance between the head end of the rod body 2 and the bottom wall of the anchor hole 1 is 50-100 mm. After the self-locking ring 5 is arranged on the anchor rod body 2, the anchor rod body 2 is divided into an upper section and a lower section, wherein the outer surface of the upper section is provided with a plurality of air holes 201, and after the central points of all the air holes 201 arranged on the outer surface of the upper section are sequentially connected according to the sequence from top to bottom, a spiral line is formed on the outer surface of the upper section. By adopting the technical scheme of the invention, the rod body 2 is made of a hollow full-thread steel pipe, the materials are convenient to obtain, and the manufacturing cost is low.
Further, as shown in fig. 3 and 4, the self-locking ring 5 includes a connecting portion 501 connected with the rod body 2 and a hollow flared collar 502 slidably fitted with the inner wall of the anchor hole 1. The connection 501 may be replaced with a common steel nut. The hollow flared retainer ring 502 is formed by welding a steel plate with a thickness of 2mm to 3.0mm around the edge of the connecting portion 501. A plurality of flow-limiting grooves 503 with the width of 5 mm-10 mm are uniformly arranged on the outer peripheral surface of the hollow horn-shaped snap ring 502. The number of the flow-limiting grooves 503 is 4-6. The difference between the outer diameter of the lower end of the hollow flared retainer ring 502 and the inner diameter of the anchor hole 1 is 2 to 4 mm. The intersection angle between the outer wall of the hollow flared clamping ring 502 and the central axis of the connecting part 501 is 25-30 degrees. The material of the consolidation body 7 is phosphorus magnesium material. By adopting the technical scheme of the invention, the tail end of the snap ring 502 is matched with the inner wall of the anchor hole in a sliding manner, so that the falling speed of the rod body 2 under the action of the gravity of the rod body is slowed down, and injected slurry is distributed more uniformly and filled more densely through gaps among the snap rings 502.
Further, the grouting anchor rod structure further comprises a positioning plug 8, the positioning plug 8 is sleeved in the anchor hole 1 close to the port, and the grouting pipe 6 penetrates through the positioning plug 8. The positioning plug 8 is made of a rubber plate having a thickness of 10 mm. By adopting the technical scheme, the positioning plug 8 ensures that the injected slurry can not leak from the port of the anchor hole all the time, and the air in the slurry can be discharged through the grouting pipe, thereby laying the foundation for the slurry filling compaction.
Further, the material of the grouting pipe 6 is a steel pipe. The specification of the grouting pipe 6 is: the outer diameter × length is equal to Φ 25mm × 6 m. Furthermore, the grouting pipe 6 is connected with a check valve to prevent slurry from flowing back, the tail end of the grouting pipe is connected with a stirring and conveying all-in-one machine with the model number of JB40/400, the stirring and conveying all-in-one machine is used for uniformly stirring various dry powder raw materials and water into mixed slurry, and then the slurry is injected into a gap between the rod body and the inner wall of the anchor hole through an output pipe.
Further, the outer specifications of the tray 3 are: length × width × thickness of 120mm × 120mm × 6mm to length × width × thickness of 120mm × 120mm × 8 mm. The fit clearance between the rod body 2 and the tray 3 is 3mm to 4 mm. As shown in fig. 5, the grouting anchor structure further comprises a positioning ring 9, wherein the positioning ring 9 is sleeved on the middle part of the rod body 2 and the outer diameter of the positioning ring 9 is matched with the anchor hole 1. Tray 3 and locating plug 9 are used for sealing the anchor eye port, and locating ring 9 is favorable to preventing that lock nut 4 pine from taking off, prevents that the thick liquids from spilling before condensing, makes the body of rod 2 bond firmly between the anchor eye inner wall to improve anchor bolt support intensity, reduced tunnel potential safety hazard.
In addition, the invention also provides a construction method of the grouting anchor rod structure, which comprises the following steps:
the method comprises the following steps: providing a grouting pipe 6, wherein the grouting pipe 6 is made of a steel pipe;
step two: adopting rock drilling equipment to drill an anchor hole 1 on the inner wall of the tunnel, and then using compressed air or water to remove all impurities in the anchor hole 1;
step three: using a grouting anchor rod structure according to any one of claims 1 to 12, screwing the self-locking ring 5 to the head end of the rod body 2, inserting the rod body into the anchor hole 1 by using an anchor rod machine so that the distance between the end of the rod body 2 and the bottom wall of the anchor hole 1 is 50mm to 100mm, sleeving the positioning plug 8, the tray 3 and the locking nut 4 at the tail end of the rod body 2 in sequence, screwing the locking nut 4, and covering the tray 3 at the port of the anchor hole 1 so that the positioning plug 8 is accommodated in the anchor hole 1; further, the distance between the installation position of the self-locking ring 5 and the head end of the rod body 2 is 200 mm-300 mm. When the length of the rod body 2 is larger than 2500mm, the number of the self-locking rings 5 is multiple, and the distance between any two adjacent self-locking rings 5 is 2000 mm-3000 mm.
Step four: preparing grouting material: putting a proper amount of magnesium phosphate cement, an additive, an admixture, aggregate and water into a stirrer to be stirred for 2-3 min to obtain a grouting material;
step five: sequentially penetrating the grouting pipe 6 in the first step through the tray 3 and the positioning plug 8 and then extending into the anchor hole 1;
step six: and (3) pouring grouting materials in the step four into grouting equipment, enabling the output end of the grouting equipment to be connected with the tail end of the rod body 2 or the grouting pipe 6 according to the extending direction of the anchor hole 1 in the rock body in the step two, starting the grouting equipment, grouting into the anchor hole 1 through the grouting equipment, sealing the tail end of the rod body 2 by using a plug when the grouting materials are filled in the anchor hole 1, then stopping grouting, and forming a solidified body 7 after the grouting materials are solidified. Further, when anchor eye 1 extends the direction upwards to extend for the horizontal plane in the rock mass, make slip casting equipment output and slip casting pipe 6 intercommunication, when anchor eye 1 extends the direction downwards for the horizontal plane in the rock mass, make slip casting equipment output and the body of rod 2 intercommunication.
By adopting the technical scheme of the invention, the self-locking ring is arranged on the rod body, when slurry is injected into the gap between the rod body of the anchor rod and the inner wall of the anchor hole, the slurry can only flow through the gap between the snap rings on the self-locking ring, so that the flow limiting effect is generated on the slurry, the slurry is prevented from flowing out to the port of the anchor hole before the slurry is solidified, so that the slurry is tightly filled, part of the slurry flowing through the gap between the snap rings reaches the head end of the rod body, the self-locking ring is pushed to move downwards under the action of the gravity of the slurry, and when the slurry acting force on two sides of the self-locking ring reaches the balance, the self-locking ring stops moving, so that the slurry is more uniformly distributed in the gap between the rod body and the inner wall of the anchor hole, in addition, the anchor hole is also provided with the positioning plug, the slurry is further effectively prevented from falling out, and finally the rod body is bonded with, the potential safety hazard is reduced. Furthermore, the grouting material is made of phosphorus-magnesium materials, the application range of the phosphorus-magnesium materials is expanded, the setting time is 10-25 min, the grouting material has the characteristics of short setting time, strong compression resistance, good bonding performance and the like, the external load borne by the grouting material can reach more than 1.5MPa, the anchor rod body and the surrounding rock anchor hole are effectively consolidated together, and the supporting effect is improved.
Claims (8)
1. A construction method of a grouting anchor rod is characterized in that: the method comprises the following steps:
the method comprises the following steps: providing a grouting pipe (6), wherein the grouting pipe (6) is made of a steel pipe;
step two: adopting rock drilling equipment to drill an anchor hole (1) on the inner wall of the tunnel, and then using compressed air or water to remove all impurities in the anchor hole (1);
step three: providing a grouting anchor rod, wherein the grouting anchor rod comprises a hollow rod body (2), a tray (3), a locking nut (4), a self-locking ring (5), a positioning plug (8) and a consolidation body (7), an anchor hole (1) is drilled in the rock body, the self-locking ring (5) is installed on the rod body (2), one end of the rod body (2) extends into the anchor hole (1), the other end of the rod body (2) sequentially penetrates through the positioning plug (8), the tray (3) and the locking nut (4) to be screwed, the tray (3) is covered at the port of the anchor hole (1), the consolidation body (7) is filled in a gap between the rod body (2) and the inner wall of the anchor hole (1), the self-locking ring (5) comprises a connecting part (501) connected with the rod body (2) and a hollow horn-shaped clamping ring (502) in sliding fit with the inner wall of the anchor hole (1), the self-locking ring (5) is screwed and installed at the head end of the rod body (2), the rod body is inserted into the anchor hole (1) by using an anchor rod machine, the distance between the end part of the rod body (2) and the bottom wall of the anchor hole (1) is 50-100 mm, a positioning plug (8), a tray (3) and a locking nut (4) are sequentially sleeved at the tail end of the rod body (2), the tray (3) is covered at the port of the anchor hole (1) after the locking nut (4) is screwed, and the positioning plug (8) is accommodated in the anchor hole (1);
step four: preparing grouting material: putting a proper amount of magnesium phosphate cement, an additive, an admixture, aggregate and water into a stirrer to be stirred for 2-3 min to obtain a grouting material;
step five: sequentially penetrating the grouting pipe (6) in the first step through the tray (3) and the positioning plug (8) and then extending into the anchor hole (1);
step six: and (3) putting the grouting material obtained in the step four into grouting equipment, enabling the output end of the grouting equipment to be connected with the tail end of the rod body (2) or the grouting pipe (6) according to the extending direction of the anchor hole (1) in the rock body obtained in the step two, starting the grouting equipment, grouting into the anchor hole (1) through the grouting equipment, sealing the tail end of the rod body (2) by using a plug when the grouting material is filled into the anchor hole (1), then stopping grouting, and forming a solidified body (7) after the grouting material is solidified.
2. The grouting anchor rod construction method according to claim 1, characterized in that: in the second step, the distance between the installation position of the self-locking ring (5) and the head end of the rod body (2) is 200-300 mm.
3. The grouting anchor rod construction method according to claim 1, characterized in that: when the length of the rod body (2) is larger than 2500mm, the number of the self-locking rings (5) is multiple, and the distance between any two adjacent self-locking rings (5) is 2000-3000 mm.
4. The grouting anchor rod construction method according to claim 1, characterized in that: and sixthly, when the anchor hole (1) extends upwards relative to the horizontal plane in the rock body in the extending direction, the output end of the grouting equipment is communicated with the grouting pipe (6), and when the anchor hole (1) extends downwards relative to the horizontal plane in the rock body in the extending direction, the output end of the grouting equipment is communicated with the rod body (2).
5. The grouting anchor rod construction method according to claim 1, characterized in that: the length of the part of the rod body (2) exposed out of the port of the anchor hole (1) is not more than 150 mm.
6. The grouting anchor rod construction method according to claim 1, characterized in that: the hollow horn-shaped clamping ring (502) is formed by welding a steel plate with the thickness of 2-3.0 mm around the edge of the connecting part (501).
7. The grouting anchor rod construction method according to claim 1, characterized in that: the outer peripheral surface of the hollow horn-shaped clamping ring (502) is also uniformly provided with a plurality of flow-limiting grooves (503) with the width of 5 mm-10 mm.
8. The grouting anchor rod construction method according to claim 1, characterized in that: the difference between the outer diameter of the lower end of the hollow horn-shaped clamping ring (502) and the inner diameter of the anchor hole (1) is 2-4 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810797249.8A CN109083666B (en) | 2018-07-19 | 2018-07-19 | Grouting anchor rod structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810797249.8A CN109083666B (en) | 2018-07-19 | 2018-07-19 | Grouting anchor rod structure and construction method thereof |
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| CN109083666B true CN109083666B (en) | 2021-02-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109763849B (en) * | 2019-03-29 | 2024-02-23 | 华侨大学 | Split type centering plug for anchor rod centering and anchor rod |
| CN112253201B (en) * | 2020-11-23 | 2023-01-24 | 中铁四局集团有限公司 | Prestressed anchor rod with grouting and grout stopping device and using method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772326A (en) * | 1986-02-28 | 1988-09-20 | Construction Products Research, Inc. | Cartridges of fast setting cement and gelled water |
| CN1200199C (en) * | 2002-06-24 | 2005-05-04 | 吴德兴 | A pin timbering process and sectionalized hollow mud injecting stay bolt thereof |
| CN102643073A (en) * | 2012-05-02 | 2012-08-22 | 河海大学 | Magnesium phosphate cement grout material |
| CN102808413B (en) * | 2012-08-21 | 2014-07-09 | 福州市第三建筑工程公司 | Reinforcement-replacing sectional-grouting pipe with inner piston and construction method thereof |
| CN204899956U (en) * | 2015-09-10 | 2015-12-23 | 徐晓宏 | Be used for subsideing post deep hole reinforced (rfd) slip casting pipe of slip casting in advance |
| CN105272138B (en) * | 2015-10-10 | 2017-08-25 | 同济大学 | A kind of magnesium phosphate cement base fast repairing mortar and preparation method thereof |
| CN206874296U (en) * | 2017-06-06 | 2018-01-12 | 中铁建大桥工程局集团第四工程有限公司 | A kind of tunnel hollow bolt grouting device |
| CN209195457U (en) * | 2018-07-19 | 2019-08-02 | 贵州磷镁材料有限公司 | A kind of grouted anchor bar structure |
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