CN111828067A - Expansion anchoring bolt for controlling roadway surrounding rock and using method thereof - Google Patents

Expansion anchoring bolt for controlling roadway surrounding rock and using method thereof Download PDF

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Publication number
CN111828067A
CN111828067A CN202010690662.1A CN202010690662A CN111828067A CN 111828067 A CN111828067 A CN 111828067A CN 202010690662 A CN202010690662 A CN 202010690662A CN 111828067 A CN111828067 A CN 111828067A
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CN
China
Prior art keywords
anchoring
expansion
hole
anchor rod
bolt
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CN202010690662.1A
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Chinese (zh)
Inventor
任兴云
郝兵元
李汝俊
田俊洲
崔燕雷
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Taiyuan University of Technology
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Taiyuan University of Technology
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Application filed by Taiyuan University of Technology filed Critical Taiyuan University of Technology
Priority to CN202010690662.1A priority Critical patent/CN111828067A/en
Publication of CN111828067A publication Critical patent/CN111828067A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/025Grouting with organic components, e.g. resin
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/008Anchoring or tensioning means

Abstract

The invention provides an expansion anchoring bolt for controlling surrounding rocks of a roadway and a using method thereof, belongs to the technical field of surrounding rock control of the roadway, and can solve the problems that the anchoring performance is poor and the tunneling speed is interfered, wherein the anchoring bolt is difficult to push towards the inside of a drilled hole, the resin and a curing agent are not uniformly stirred, and the anchoring bolt is easy to be debonded and failed along a hole wall rock body under the conditions of loose or broken surrounding rocks in the conventional bolt support. According to the technical scheme provided by the invention, only one resin cartridge anchoring agent with the length of 0.35m is used, the resistance of pushing the anchor rod into the drill hole is small during installation, the construction operation is easy, the twist-shaped end of the anchor rod can be used for uniformly stirring the resin and the curing agent in the resin cartridge anchoring agent, and the initial pre-tightening force can be applied to the anchor rod after 5 minutes of stirring is finished, so that the roadway surrounding rock is supported in time, the supporting process follows the tunneling process, the tunneling speed is not interfered, and the engineering benefit of rapid tunneling of the roadway is realized.

Description

Expansion anchoring bolt for controlling roadway surrounding rock and using method thereof
Technical Field
The invention belongs to the technical field of roadway surrounding rock control, and relates to an expansion anchoring bolt for roadway surrounding rock control and a using method thereof.
Background
The roadway is an important passage which plays roles of ventilation, pedestrian, transportation and the like in the process of carrying out mining production activities in a mine, is equivalent to blood vessels in a human body, and must be kept safe and smooth in the service period. The roadway excavation destroys the original balance state of the coal rock layer formed in hundreds of millions of years, so that after the roadway excavation, reasonable supporting modes and supporting parameters are selected in time to form an effective supporting structure, the stress condition of the roadway surrounding rock is improved, meanwhile, the self-bearing capacity of the surrounding rock is fully exercised, the harmful deformation of the roadway surrounding rock is controlled, and the roadway surrounding rock is ensured to be in a safe state during service.
Through investigation on the existing roadway support theory and technology, the anchor rod is one of the most main support modes used in the roadway of the coal mine at present. The anchor bolt support technology is that a hole is drilled in a surrounding rock body to be supported, a certain bonding material is used as an anchoring agent, and an anchor bolt and a rock body on the wall of the drilled hole are bonded into a whole, so that the extrusion deformation of the supported rock body to a roadway space is restrained by means of the tensile property of a bolt body, and the surrounding rock control is realized. The existing anchoring material used in the underground coal mine is mainly resin anchoring agent, and the resin anchoring agent is formed by respectively filling resin daub and a curing agent into a sealing bag with two cavities to form a resin anchoring cartridge with a certain diameter and length. When the anchor rod is used, a certain amount of resin anchoring cartridges are placed into a drilled hole, then the anchor rod is stretched into the drilled hole and contacted with the resin anchoring cartridges, an anchor rod drilling machine is connected to the tail of the anchor rod, the anchor rod is pushed into the drilled hole and simultaneously driven to rotate rapidly, plastic packaging film bags of two cavities of the resin anchoring cartridges in the drilled hole are burst by the aid of the rapidly-rotating anchor rod, resin and a curing agent which are originally respectively filled in the two cavities are stirred together and filled in a gap between the anchor rod and the wall of the drilled hole, after the anchoring material is bonded and cured, a tray and a nut are sequentially installed at the hole opening of the drilled hole, and pretightening force is applied to a rod body of the anchor rod by tightening the nut.
The length of the anchor rod used in the underground coal mine is about 2m generally, and in order to enable the anchor rod and a hole wall rock body to have higher bonding strength, more resin anchoring cartridges are generally needed to be used, so that the following problems can be caused: (1) the anchor rod is difficult to push into the drill hole, at least two workers are often required to push the anchor rod into the drill hole in a combined manner, the labor intensity of the workers is high, and in the process of pushing the anchor rod, an operator is easy to slip from the anchor rod drilling machine, so that potential safety hazards exist; (2) the resin and the curing agent are not uniformly stirred, and in addition, more cartridge plastic packaging film bags are wrapped in the anchoring material, the bonding property is lower than the design requirement, and an anchoring cavity is easily formed; (3) when the hole wall rock mass is softer or broken, the anchor rod which rotates rapidly enables the hole wall rock mass to be further broken, so that the bonding performance of the anchoring agent and the interface of the hole wall rock mass is poor, and the phenomenon that the anchor rod is debonded and failed along the hole wall rock mass easily occurs during the application of pretightening force or service. Accordingly, engineers continue to seek alternative new anchoring methods that overcome the above-mentioned difficulties.
A novel hydraulic expansion type recyclable anchor rod with the publication number of CN 205297608U can be obtained in the published documents, and the anchoring principle of the method is that a flap-shaped sleeve at the top of the anchor rod and an annular support plate in the middle of the anchor rod are expanded and unfolded by utilizing hydraulic pressure, and mechanical friction force is generated between the anchor rod and a rock body of a drilling wall, so that the anchoring effect on surrounding rocks is realized. Although the method does not use resin anchoring materials and has the advantage of recoverable anchor rods, the anchor rods have more mechanical devices and fine operation requirements, are difficult to install and operate in narrow and hidden drilling spaces, and are poor in stress reliability because the anchor rods only rely on two mechanical expansion points at the top and the middle to provide axial friction force.
The publication number is ' CN 109139069A ' an active expansion type pipe seam anchor rod and preparation and use thereof ', the anchoring principle of the method is that the front end of the pipe seam anchor rod is expanded and expanded to form a three-petal structure by utilizing a self-expansion device arranged inside the pipe seam anchor rod, and the three-petal structure becomes a stress point of the anchor rod for providing anchoring action along the axial direction of the anchor rod. The self-expansion device of the method mainly comprises a medicine cylinder filled with an expansion agent and a protective cylinder sleeved on the medicine cylinder, and before the self-expansion device is used, the active expansion type pipe seam anchor rod needs to be placed in water to be soaked or drenched, so that water enters the expansion agent. Although this method utilizes the expansion action of the expanding agent to provide a stress point for the tube seam anchor rod, it has two disadvantages: firstly, the swelling agent generates hydration to generate enough swelling force for swelling and opening a three-petal structure at the front end of the pipe seam anchor rod, and at least 30-50 minutes are required to wait, so that pre-tightening force cannot be immediately applied after the anchor rod is installed, the supporting effect cannot be timely obtained in the waiting time after the roadway surrounding rock is exposed, the supporting process cannot follow the tunneling process, the tunneling speed can be interfered, and the rapid tunneling is restricted; secondly, the active expansion type pipe seam anchor rod needs to be placed in water for soaking or water spraying before installation, the soaking time or the water spraying amount is completely grasped by the experience of constructors, and the subjective factor influence is large, so that the water amount entering the expansion agent is not controllable, the expansion performance of the expansion agent under the conditions of different water-cement ratios is different, and the anchoring effect is influenced.
Disclosure of Invention
In view of the above situation, the technical problem to be solved by the present invention is: the existing anchor rod support uses more resin anchoring cartridges, so that the anchor rod is difficult to push inwards the drill hole; the stirring of the resin and the curing agent is uneven, and the problems of poor anchoring performance and interference of tunneling speed such as debonding failure of the anchor rod along a hole wall rock body and the like easily occur under the soft or broken surrounding rock conditions.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an expansion anchoring bolt for controlling surrounding rocks of a roadway and a using method thereof are provided.
An expansion anchor bolt for roadway surrounding rock control, the structure comprising: the screw thread comprises a twisted end and a hollow threaded rod body, wherein one end of the end is connected with one end of the threaded rod body, the other end of the threaded rod body is provided with an end tail screw thread, a hollow hole is formed in the inner portion of the threaded rod body, threads are arranged on the surface of the threaded rod body, a plurality of discharge holes are formed in the two sides of the threaded rod body respectively, and the discharge holes are symmetrically arranged relative to the axis of the threaded rod body.
The length L of the expansion anchoring anchor rod is 1.6-2.4 m.
The length of the end is 0.3m, and the end is twisted by 180 degrees multiplied by 3=540 degrees clockwise by a steel sheet with the length multiplied by the width multiplied by the height =30 multiplied by 28 multiplied by 9mm to form a twist shape.
The length of the threaded rod body is 1.3-2.1m, the outer diameter of the threaded rod body is 18mm, the inner diameter of the threaded rod body is 6mm, the height of the threads is 1.2mm, the thread pitch of the threads is 9mm, and the tail length of the hollow threaded rod body is 0.05m, and the hollow threaded rod body is processed into an outer thread capable of screwing a nut and an expansion material injection pipeline.
The interval of discharge opening is 100mm, and the diameter of discharge opening is 6 mm.
A use method of an expansion anchoring bolt for controlling surrounding rocks of a roadway comprises the following steps:
firstly, drilling a borehole in a rock mass to be anchored by using a drilling machine, wherein the bore diameter of the borehole is 30mm, and the bore depth is: (L-0.05) m, and drilling and deslagging are clean;
secondly, putting a quick resin cartridge anchoring agent with the model number of K2335 into the drilled hole, pushing the resin cartridge anchoring agent to the bottom of the drilled hole by using a twist-shaped end head of the expansion anchoring anchor rod, connecting an anchor rod drilling machine to the exposed end of the tail part of the expansion anchoring anchor rod, rotating the expansion anchoring anchor rod, stirring the resin cartridge anchoring agent and pushing the expansion anchoring anchor rod into the bottom of the drilled hole, and leaving the end tail thread part of the tail part of the expansion anchoring anchor rod outside the drilled hole;
thirdly, sequentially penetrating the hole sealing plug and the central hole of the tray through the exposed end of the expansion anchoring bolt, tightly pressing the tray against the hole sealing plug, then installing a nut matched with the end tail screw thread of the exposed end of the anchor bolt, and applying initial pre-tightening force to the expansion anchoring bolt by screwing the nut;
fourthly, connecting an exposed end of the expansion anchoring bolt with an expansion anchoring material injection pipeline matched with an end tail screw thread of the expansion anchoring bolt, wherein the mass ratio of the expansion anchoring material to water is 0.7: 0.3 preparing expansion anchoring material slurry, starting an injection pump connected with an injection pipeline, and injecting the expansion anchoring material slurry into a closed space between an expansion anchoring bolt and the wall of a drilling hole through a hollow hole and a discharge hole on a hollow threaded rod;
fifthly, when the working pressure of the injection pump reaches 0.5MPa, the closed space between the anchor rod and the wall of the drilled hole is filled with the expansion anchoring material slurry, the injection pipeline connected to the exposed end of the anchor rod is removed, the hollow hole in the hollow threaded rod is plugged by a wooden plug, and the expansion anchoring material slurry is prevented from flowing out;
sixthly, cleaning the injection pipeline and the injection pump of the expansion anchoring material by using clear water;
seventhly, after the grouting of the expansion anchoring material slurry is finished for 8 hours, applying pre-tightening force to the anchor rod for the second time by screwing the nut;
and eighthly, installing the expansion anchoring bolt on the roadway surrounding rock needing anchoring hole by hole according to the steps.
The diameter of the anchor rod installation drill hole is 30mm, the length of the anchor rod installation drill hole is (L-0.05) m, and the anchor rod installation drill hole is drilled by using an anchor rod drilling machine.
The K2335 resin cartridge anchoring agent is a quick resin cartridge anchoring agent commonly used in coal mines, the diameter of the cartridge is 23mm, the length of the cartridge is 35mm, the installation and stirring time is 10-15 seconds, and the setting and curing time is 5 minutes.
The expansion anchoring material is an expanding agent, the main component of the expansion anchoring material is hydrated lime, the expansion anchoring material is a gray powdery material which is made of various inorganic substances and has expansion performance, and the optimal mass ratio of the expansion anchoring material to water is 0.7: 0.3.
the hole sealing plug is made of rubber and is in a circular truncated cone shape, the height of the hole sealing plug is 10mm, the diameter of the upper section of the circular truncated cone is 26mm, the diameter of the lower section of the circular truncated cone is 36mm, the diameter of the mounting hole is 18mm, and the hole sealing plug has the effects of sealing a drilling hole and preventing the expansion anchoring material from flowing out and centering an anchor rod.
The tray is a Q235 metal flat tray with the length multiplied by the width multiplied by the height =150 multiplied by 16mm, and an anchor rod mounting hole with the diameter of 20mm is arranged in the middle.
The nut is matched with the expansion anchoring bolt thread, the outer diameter of the nut is 30mm, the inner diameter of the nut is 18mm, and the height of the nut is 15 mm.
The expansion anchoring material injection pipeline is a high-pressure rubber hose which is connected with an injection pump, and a connecting sleeve is matched with the expansion anchoring bolt screw thread.
The expansion anchoring material injection pump is a pneumatic injection pump, and the pumping pressure can reach 0.5 MPa.
The wooden plug is made of cylindrical wood materials which can block the hollow hole of the expansion anchoring bolt.
The invention has the following beneficial effects:
according to the technical scheme provided by the invention, only one K2335 quick resin cartridge anchoring agent with the length of 0.35m is used, the resistance of pushing the resin cartridge anchoring agent into the drill hole is small when the anchor rod is installed, the construction operation is easy, the resin and the curing agent in the resin cartridge anchoring agent can be uniformly stirred by using the twist-shaped end of the anchor rod, the initial pretightening force can be applied to the anchor rod after the stirring is finished for 5 minutes, the quick installation requirement is met, the timely support of the surrounding rock of the roadway is realized, the supporting process is closely followed with the tunneling process, the tunneling speed is not interfered, and the engineering benefit of the rapid tunneling of the roadway is realized.
According to the technical scheme provided by the invention, the expansion anchoring material is injected into the closed space between the anchoring anchor rod and the wall of the drilling hole, so that the thickness of an expansion anchoring ring formed between the anchor rod and the wall of the drilling hole is 6mm, the annular expansion anchoring material is condensed and solidified into an elastic cylinder with certain strength after hydration reaction, and meanwhile, the expansion volume is increased to exert radial extrusion action on the rod body of the anchor rod and the rock body of the wall of the drilling hole, so that the bonding acting force of an anchoring interface can be increased, the bonding friction resistance of the anchoring interface and the ultimate withdrawal resistance of the anchor rod are improved, the anchoring effect is enhanced, and the problem of debonding failure of the anchor rod along the rock body of the; and under the condition of not damaging the integrity of the rock mass of the wall of the drilled hole, the original joint, crack and other natural structural surfaces in the anchored rock mass around the drilled hole are compacted through radial extrusion, the physical and mechanical properties such as cohesive force, internal friction angle and the like of the anchored rock mass around the hole wall are improved, the self-bearing capacity of the rock mass is brought into play, and the stability of a supporting structure and surrounding rocks of a roadway is kept.
The technical proposal provided by the invention uses the resin cartridge anchoring agent to anchor the twist-shaped end of the anchor rod, the full-length composite anchoring of the comprehensive functions of bonding and expansion is realized by using an expansion material which can generate radial expansion after reacting with water in the range of a thread-shaped rod body, the full-length composite anchoring of the comprehensive functions of bonding and expansion is realized by the anchor rod, and the anchor rod is divided into two parts of a resin bonding inner anchoring section and an expansion outer anchoring section, wherein the resin inner anchoring section provides pretightening force and initial anchoring force, the expansion outer anchoring section provides expansion force and secondary anchoring force, which can overcome the defect that when only the end head anchor is used, the surrounding rock of the non-anchoring section deforms and damages to the inner hole gap due to the single compression acting force along the axial direction of the rod body, and the whole anchoring system can be subjected to the axial compression action generated by the pretightening force and the radial expansion extrusion action generated by the expansion material, so that the strength of the rock mass in the anchoring range is enhanced, and the surrounding rock can be kept in a stable state.
Drawings
Fig. 1 is a schematic structural view of an expansion anchor bolt of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic view of the installation of the expansion anchor bolt of the present invention;
FIG. 4 is a sectional view taken along line B-B of FIG. 3;
FIG. 5 is a schematic structural view of a hole sealing plug according to the present invention;
FIG. 6 is a schematic structural view of the tray of the present invention;
FIG. 7 is a schematic diagram of the implementation steps of the present invention;
wherein: 1. a tip; 2. a hollow bore; 3. a threaded rod body; 4. a discharge hole; 5. a thread; 6. end tail screw threads; 7. a resin anchoring material; 8. expanding the anchoring material; 9. sealing the hole plug; 10. a tray; 11. a nut; 12. drilling; 13. resin cartridge anchoring agent; 14. an anchoring material injection line; 15. and (4) a wooden plug.
Detailed Description
The present application is described below by way of examples, and the description given in the examples belongs to one embodiment of the technical solutions given in the present application, and does not limit the application of the present application.
The length L =1.6-2.4m of the rod body of the expansion anchoring bolt along the axial direction, the rod body along the axial direction is divided into a twist-shaped end head and a hollow thread-shaped rod body, and the two parts of the rod body are integrally forged by Q235 carbon structural steel. Wherein the length L of the twist-shaped end1And the steel sheet with the length multiplied by the width multiplied by the height =30 multiplied by 28 multiplied by 9mm is twisted by 180 degrees multiplied by 3=540 degrees clockwise to form a twist shape, and the twist shape is used for stirring the resin anchoring cartridge, so that the rapid anchoring installation and the timely pre-tightening force application are realized. Length L of hollow screw-thread rod2=L-L1The diameter of the hollow threaded rod body is phi 1=18mm, threads on the surface of the threaded rod body are used for increasing mechanical friction force and anti-sliding shearing force on a contact interface of the anchor rod and an expansion anchoring material, the height of the threads is 1.2mm, and the thread pitch is 9 mm; the diameter phi 2=6mm of the hollow hole of the hollow thread-shaped rod body, every 100mm of axial interval of the hollow thread-shaped rod body is provided with a group of oppositely-penetrated small discharge holes with the diameter phi 3=6mm, the hollow hole of the hollow thread-shaped rod body is used for injecting expansion anchoring materials, and the small discharge holes are used for enabling the expansion anchoring materials to enter a closed space between the anchor rod and the wall of the drill hole; the hollow thread-shaped rod body is processed into an external thread capable of screwing a nut and an expansion material injection pipeline within the range that the tail length of the rod body is 0.05 m.
A use method of an expansion anchoring bolt for controlling surrounding rocks of a roadway comprises the following steps:
firstly, drilling a drilled hole for installing an anchor rod in a rock body to be anchored by using a drilling machine, wherein the hole diameter of the drilled hole is 30mm, and the hole depth is: (L-0.05) m, and drilling and deslagging are clean;
secondly, putting a quick resin cartridge anchoring agent with the model number of K2335 into the drilled hole, pushing the resin cartridge anchoring agent to the bottom of the hole by using a twist-shaped end head of an expansion anchoring anchor rod, connecting an anchor rod drilling machine at the exposed end of the tail part of the expansion anchoring anchor rod, rotating the anchor rod to stir the resin cartridge anchoring agent and push the anchor rod to the bottom of the hole, and keeping an outer screw thread part of the tail part of the anchor rod, which is 0.05m long, outside the hole;
and thirdly, sequentially penetrating the hole sealing plug and the central hole of the tray through the exposed end of the anchor rod, tightly pressing the tray against the hole sealing plug, then installing a nut matched with the screw thread of the exposed end of the anchor rod, and applying initial pretightening force to the anchor rod by screwing the nut. If the anchored roadway surrounding rock is a coal body, applying initial pretightening force to the anchor rod until the torque of the nut is 50 N.m; if the anchored roadway surrounding rock is a rock body outside the coal seam, applying initial pre-tightening force to the anchor rod until the torque of the nut is 80 N.m;
fourthly, connecting an expansion anchoring material injection pipeline matched with the screw thread at the exposed end of the anchor rod, wherein the water-cement ratio is 0.7: 0.3 preparing a proper amount of expansion anchoring material slurry, starting an injection pump connected with an injection pipeline, and injecting the expansion anchoring material slurry into a closed space between the anchor rod and the wall of the drilled hole through a hollow hole and a small discharge hole on the hollow threaded rod body;
fifthly, when the working pressure of the injection pump reaches 0.5MPa, the closed space between the anchor rod and the wall of the drilled hole is filled with the expansion anchoring material slurry, the injection pipeline connected to the exposed end of the anchor rod is removed, the hollow hole in the hollow threaded rod body is plugged by a wooden plug, and the expansion anchoring material slurry is prevented from flowing out;
sixthly, cleaning the injection pipeline and the injection pump of the expansion anchoring material by using clear water;
and seventhly, after the grouting of the expanded anchoring material is finished for 8 hours, applying pre-tightening force to the anchor rod for the second time by screwing the nut. If the anchored roadway surrounding rock is a coal body, applying pretightening force to the anchor rod until the torque of the nut is 100 N.m; if the anchored roadway surrounding rock is a rock body outside the coal seam, applying a pre-tightening force to the anchor rod until the torque of the nut is 150 N.m;
and eighthly, installing the expansion anchoring bolt on the roadway surrounding rock needing anchoring hole by hole according to the steps. If the anchored roadway surrounding rock is a coal body, the distance and the row pitch of the mounting holes of the expansion anchoring anchor rods are both 0.8 m; if the anchored roadway surrounding rock is a rock body outside the coal seam, the distance and the row distance of the expansion anchoring anchor rod mounting holes are both 0.9 m.
The method effectively solves the problems that the anchor rod is difficult to push inwards the drilled hole due to the fact that more resin anchoring cartridges are used, the resin and curing agent are not uniformly stirred, the anchor rod is easy to be unstuck and lose efficacy along the rock body of the hole wall under the soft or broken surrounding rock conditions, and the like, and has poor anchoring performance, and can apply pre-tightening force immediately after the anchor rod is installed to meet the requirement of quick installation, 1' 11 enables the supporting process to follow the tunneling process, so that the tunneling speed is not interfered, and the engineering benefit of rapid tunneling of a roadway is realized.

Claims (5)

1. The utility model provides an inflation anchor stock for control of tunnel country rock which characterized in that: the inflation anchor stock is including end (1) and the hollow threaded rod body (3) that are the twist form, the one end of end (1) and the one end fixed connection of the threaded rod body (3), and the other end of the threaded rod body (3) is equipped with end tail screw thread (6), and the inside of the threaded rod body (3) is equipped with well cavity hole (2), and the surface is equipped with screw thread (5), and the both sides of the threaded rod body (3) are equipped with a plurality of discharge openings (4) respectively, the axis symmetry setting of the relative threaded rod body (3) of discharge opening (4).
2. An expansion anchor bolt for roadway surrounding rock control according to claim 1, wherein: the length L of the expansion anchoring anchor rod is 1.6-2.4m, the length of the end is 0.3m, the length of the threaded rod body is 1.3-2.1m, the outer diameter of the threaded rod body is 18mm, the inner diameter of the threaded rod body is 6mm, the height of the thread is 1.2mm, and the thread pitch of the thread is 9 mm; the hollow screw-thread-shaped rod body is processed into an external screw thread which can be screwed with a nut and an expansion material injection pipeline within the range of 0.05m in length at the tail part.
3. An expansion anchor bolt for roadway surrounding rock control according to claim 1, wherein: the end head is twisted clockwise by 180 degrees by 3=540 degrees by a steel sheet with length × width × height =30 × 28 × 9mm to form a twist shape.
4. An expansion anchor bolt for roadway surrounding rock control according to claim 1, wherein: the interval of discharge opening is 100mm, and the diameter of discharge opening is 6mm, and the length of end tail screw thread is 0.05 m.
5. A use method of an expansion anchoring bolt for controlling surrounding rocks of a roadway is characterized in that: the method specifically comprises the following steps:
firstly, drilling a borehole in a rock mass to be anchored by using a drilling machine, wherein the bore diameter of the borehole is 30mm, and the bore depth is: (L-0.05) m, and drilling and deslagging are clean;
secondly, putting a quick resin cartridge anchoring agent with the model number of K2335 into the drilled hole, pushing the resin cartridge anchoring agent to the bottom of the drilled hole by using a twist-shaped end head of the expansion anchoring anchor rod, connecting an anchor rod drilling machine to the exposed end of the tail part of the expansion anchoring anchor rod, rotating the expansion anchoring anchor rod, stirring the resin cartridge anchoring agent and pushing the expansion anchoring anchor rod into the bottom of the drilled hole, and leaving the end tail thread part of the tail part of the expansion anchoring anchor rod outside the drilled hole;
thirdly, sequentially penetrating the hole sealing plug and the central hole of the tray through the exposed end of the expansion anchoring bolt, tightly pressing the tray against the hole sealing plug, then installing a nut matched with the end tail screw thread of the exposed end of the anchor bolt, and applying initial pre-tightening force to the expansion anchoring bolt by screwing the nut;
fourthly, connecting an exposed end of the expansion anchoring bolt with an expansion anchoring material injection pipeline matched with an end tail screw thread of the expansion anchoring bolt, wherein the mass ratio of the expansion anchoring material to water is 0.7: 0.3 preparing expansion anchoring material slurry, starting an injection pump connected with an injection pipeline, and injecting the expansion anchoring material slurry into a closed space between an expansion anchoring bolt and the wall of a drilling hole through a hollow hole and a discharge hole on a hollow threaded rod;
fifthly, when the working pressure of the injection pump reaches 0.5MPa, the closed space between the anchor rod and the wall of the drilled hole is filled with the expansion anchoring material slurry, the injection pipeline connected to the exposed end of the anchor rod is removed, the hollow hole in the hollow threaded rod body is plugged by a wooden plug, and the expansion anchoring material slurry is prevented from flowing out;
sixthly, cleaning the injection pipeline and the injection pump of the expansion anchoring material by using clear water;
seventhly, after the grouting of the expansion anchoring material slurry is finished for 8 hours, applying pre-tightening force to the anchor rod for the second time by screwing the nut;
and eighthly, installing the expansion anchoring bolt on the roadway surrounding rock needing anchoring hole by hole according to the steps.
CN202010690662.1A 2020-07-17 2020-07-17 Expansion anchoring bolt for controlling roadway surrounding rock and using method thereof Pending CN111828067A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112554925A (en) * 2020-12-04 2021-03-26 中煤科工开采研究院有限公司 Stretch-draw slip casting stock
CN112554921A (en) * 2020-12-04 2021-03-26 中煤科工开采研究院有限公司 Hollow tensioning anchor rod surrounding rock reinforcing method

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CN202441403U (en) * 2012-02-22 2012-09-19 吴昊 High-pressure water self-drilling grouting anchor rod for mine
CN104632259A (en) * 2014-12-31 2015-05-20 中国矿业大学 End-head self-expansion enlarging type anchoring method for soft and weak stratum
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CN112554921A (en) * 2020-12-04 2021-03-26 中煤科工开采研究院有限公司 Hollow tensioning anchor rod surrounding rock reinforcing method

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