Resin anchoring agent feeding device and method for chambering and anchoring

Abstract

The invention discloses a feeding device and a feeding method for a resin anchoring agent for reaming and anchoring. The feeding device comprises a guide cap, a hollow constraint component and a crushing and stirring component, a plurality of conical needles are arranged at the front end of the guide cap, and a sleeve with first internal threads is arranged at the tail end of the guide cap; the hollowed-out restraining component is of a hollow long pipe structure, a resin anchoring agent is installed in a pipe body, a hollowed-out groove is formed in the outer ring of the middle of the pipe body, a first external thread is arranged at the front end of the pipe body, and a second internal thread is arranged at the tail end of the pipe body. The crushing and stirring component is of a hollow sleeve structure, a second external thread is arranged on the outer ring of a barrel, and a conical spiral blade is arranged at the front end of the barrel; the crushing and stirring component is fixed to the front end of the anchor cable and enters the rod body of the hollow restraining component through rotation of the anchor cable, and pushing and stirring of the resin anchoring agent are achieved. While the stirring and anchoring effects of the anchoring agent in the chambering area of the anchoring hole are guaranteed, the chambering and anchoring construction efficiency of the anchor cable (rod) is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnels and underground engineering, and in particular to a resin anchoring agent feeding device and a feeding method for hole expansion anchoring. Background Art

[0002] Hole expansion anchoring technology has been applied in anchor cable (rod) support in coal mine tunnels and rock and soil slopes. It aims to increase the bonding area between the anchor and the surrounding rock to solve engineering problems such as insufficient anchoring force and attenuation of anchor cable (rod) in soft rock (soil) strata. Compared with conventional anchoring, hole expansion anchoring usually has a partially enlarged anchor hole, i.e., a hole expansion area. During the installation of the resin anchor roll, when the resin anchor roll is pushed through the hole expansion area, due to the poor bending resistance of the resin anchor roll, it is easy to bend toward the hole expansion area in the absence of constraints from the anchor hole wall, which makes it difficult for the resin anchor roll to be fully crushed and stirred in the hole expansion area, thereby affecting the stirring effect of the resin anchor, making it difficult for the resin anchor to be fully cured and filled in the hole expansion area, which will seriously affect the hole expansion anchoring effect of the anchor cable (rod).

[0003] In the existing resin anchor installation and construction technology, the publication number: CN 217976265 U discloses an anchor delivery sleeve, which is constructed of a reference part, a conical head, an anchor cable connecting sleeve, etc. The device has a simple structure, and the reference part can be extended, which is highly practical for conventional anchor holes. However, for hole expansion anchoring, since its reference part is composed of a steel wire bundle, the overall rigidity is poor. During the process of the anchor cable advancing and stirring the resin anchor in the drill hole, the steel wire bundle is prone to expansion and bending and gap enlargement in the hole expansion area, causing the resin anchor to enter the hole expansion area before being fully stirred, thereby having a significant impact on the hole expansion anchoring effect. Secondly, the manufacturing process of the tensioning sleeve in the device is complicated, and the anchor cable needs to break through the tensioning sleeve to advance during the construction process, which increases the difficulty of construction. Therefore, it is necessary to develop an anchor feeding device and feeding method for hole expansion anchoring to solve the problems of bending and insufficient stirring of the resin anchor in the hole expansion area during the pushing and stirring of the resin anchor, while achieving the purpose of simplifying the resin anchor installation process, improving construction efficiency, and optimizing the hole expansion anchoring effect. Summary of the invention

[0004] In response to the above technical problems, the present invention provides a resin anchor feeding device and a feeding method for hole expansion and anchoring, so as to solve the problems of bending and insufficient stirring of the resin anchor in the hole expansion area during the pushing and stirring of the resin anchor, while achieving the purpose of simplifying the resin anchor installation process, improving construction efficiency, and optimizing the hole expansion and anchoring effect.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A resin anchoring agent feeding device for hole expansion anchoring, comprising a guide cap, a hollow restraining member and a crushing and stirring member;

[0007] The front end of the guide cap is provided with a plurality of tapered needles, and the rear end is a sleeve with a first internal thread;

[0008] The hollow restraining member is a hollow long tube structure, a resin anchor is installed inside the tube body, a hollow groove is opened on the outer circle of the middle part of the tube body, a first external thread matching the first internal thread is arranged at the front end of the tube body, and a second internal thread is arranged at the rear end;

[0009] The crushing and stirring member is a hollow sleeve structure, the outer ring of the cylinder is provided with a second external thread matching the second internal thread, and the front end of the cylinder is provided with a conical spiral blade;

[0010] The crushing and stirring member is fixed at the front end of the anchor cable, and enters into the rod body of the hollow restraining member through the rotation of the anchor cable, so as to push and stir the resin anchoring agent.

[0011] In the above-mentioned resin anchor feeding device for hole expansion anchoring, the front end of the guide cap is three conical needles, which are arranged on the bottom surface of the sleeve.

[0012] In the above-mentioned resin anchor feeding device for hole expansion anchoring, each hollow constraint component includes three groups of hollow grooves, and each group of hollow grooves is composed of three straight grooves symmetrically distributed along the circumference.

[0013] In the above-mentioned resin anchor feeding device for hole expansion anchoring, the spacing between two adjacent groups of hollow grooves is 85 mm.

[0014] In the above-mentioned resin anchor feeding device for hole expansion anchoring, four groups of conical spiral blades are arranged at the front end of the crushing and stirring member.

[0015] In the above-mentioned resin anchor feeding device for hole expansion anchoring, the conical spiral blade is a right spiral tooth-like structure.

[0016] In the above-mentioned resin anchor feeding device for hole expansion anchoring, the crushing and stirring member is fixed to the front end of the anchor cable by gluing or clamping.

[0017] A method for delivering a resin anchoring agent for hole expansion anchoring comprises the following steps:

[0018] 【1】Expanding and anchoring hole forming;

[0019] 【2】Connect the guide cap to the front end of the hollow constraint member through threads, fill the hollow constraint member with anchoring agent, and then push the end with the guide cap installed into the expanded anchor hole;

[0020] 【3】Fix the crushing and mixing component to the front end of the anchor cable;

[0021] 【4】Connect the installed crushing and stirring member to the second internal thread of the inner ring of the hollow restraining member through the second external thread of the outer ring;

[0022] 【5】 Push the entire device through the anchor cable until the conical needle on the guide cap is inserted into the rock mass at the bottom of the hole;

[0023] [6] Manually rotate the anchor cable to disengage the second external thread on the surface of the crushing and stirring member from the second internal thread inside the hollow restraining member, so that the crushing and stirring member enters the interior of the tube body of the hollow restraining member;

[0024] 【7】The other end of the anchor cable is connected to the drilling rig, which is started to drive the anchor cable to stir the anchoring agent to solidify it.

[0025] In the above-mentioned method for delivering resin anchoring agent for hole expansion anchoring, in step [3], the crushing and stirring component is fixed to the front end of the anchor cable by gluing or clamping.

[0026] The beneficial technical effects of the present invention are as follows:

[0027] 1. The resin anchor feeding device of the present invention is composed of a guide cap, a hollow constraint member, a crushing and stirring member, etc. Compared with the existing device, the connection method between the components of the present invention adopts a threaded connection, which simplifies the assembly process of the device. In addition, the anchor feeding device is made of a hollow stainless steel pipe. This design ensures that the structure is not damaged by the high-speed rotating anchor cable (rod) while also ensuring that the anchor can be smoothly diffused into the expansion area of ​​the anchor hole. In addition, the resin anchor feeding device is provided with a conical needle at the front end of the guide cap. After the anchor feeding device is pushed, the conical needle is inserted into the rock mass at the bottom of the hole, which can prevent the anchor feeding device from rotating with the anchor cable (rod) and thus damaging the hole wall and affecting the anchoring effect. A tooth-shaped spiral blade is also provided on the crushing and stirring member, which can better crush the anchor packaging bag during the rotation process to ensure the stirring effect of the anchor. The structural design of the present invention solves the problem of efficient pushing and sufficient stirring of the resin anchor in the expansion area of ​​the anchor hole, and provides a technical guarantee for achieving an ideal anchor cable (rod) expansion anchoring effect.

[0028] Second, the present invention loads the resin anchor drug roll into the feeding device and pushes it into the expanded anchor hole, avoiding the construction difficulties such as bending and insufficient stirring in the expanded hole area of ​​the anchor hole during the pushing process of the resin anchor drug roll. In addition, the present invention connects the surface threads on the crushing and stirring components with the threads in the hollow constraint component, pushes the anchor feeding device into the anchor hole through the anchor cable (rod), and continues to rotate the crushing and stirring components after the pushing is completed to separate the two threads, and the crushing and stirring components enter the hollow constraint component, and then crushes and stirs the resin anchor under the drive of the drilling rig. This method can not only realize the integrated construction of resin anchor feeding and stirring of the anchor cable (rod) in the expanded hole anchoring mode, but also avoid the "glove effect" that occurs during the stirring process of the resin anchor and affects the anchoring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of an expanded anchor hole in surrounding rock according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of a guide cap according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of a hollowed-out restraining component according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of a guide cap installed on a constrained hollowing device according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a crushing and stirring component according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of a crushing and stirring member installed at the end of an anchor cable according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of loading a resin anchoring agent according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of using an anchor cable to push an anchoring agent delivery device to the bottom of a hole in an embodiment of the present invention;

[0037] Fig. 9 This is a schematic diagram of the resin anchoring agent after stirring according to an embodiment of the present invention.

[0038] Figure markings: 1-surrounding rock; 2-expansion anchor hole; 3-guide cap; 3-1-conical needle; 3-2-first internal thread; 3-3-sleeve; 4-hollow constraint member; 4-1-first external thread; 4-2-hollow groove; 4-3-second internal thread; 5-crushing and stirring member; 5-1-conical spiral blade; 5-2-second external thread; 6-anchor cable; 7-resin anchor. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.

[0041] Combination Figures 1 to 9 , introduce the specific technical solution of the present invention:

[0042] Figure 1 The structure is that the existing expansion anchor holes 2 are arranged inside the surrounding rock, and the expansion anchor holes 2 are arranged at intervals in the straight hole part.

[0043] The resin anchor feeding device for hole expansion anchoring of the present invention comprises a guide cap 3, a hollow restraining member 4, and a crushing and stirring member 5.

[0044] like Figure 2 As shown, the guide cap 3 is composed of three conical needles 3-1 and a sleeve 3-3. The bottom surface of the sleeve is provided with three conical needles 3-1, which are 25 mm long, 6 mm in outer diameter of the bottom circle, and made of stainless steel. The conical needles 3-1 are designed so that the guide cap can be inserted into the rock mass 1 to prevent the anchor feeding device from rotating with the anchor cable. The sleeve is provided with a first internal thread 3-2, which matches the first external thread 4-1 on the hollow constraint member. The sleeve is 35 mm long, 30 mm in outer diameter, and 1 mm thick.

[0045] like Figure 3 and Figure 4 As shown, the hollow restraining member 4 is made of a 1.5mm thick stainless steel tube, 1300mm long and 28mm in outer diameter. A 20mm long first external thread 4-1 is provided at the front end, which is connected to the guide cap 3 through the thread to form an anchor feeding device. A 20mm second internal thread 4-3 is provided on the inner surface of the tail end of the hollow restraining member 4, and the second internal thread 4-3 is connected to the second external thread 5-2 of the outer wall of the crushing and stirring member. After the threaded connection, the anchor feeding device is pushed into the borehole through the anchor cable 6 connected to the crushing and stirring member. When a fault occurs during the pushing process, the anchor feeding device can also be pulled out of the borehole through the connection of the thread.

[0046] The middle part of the hollow restraining member 4 is a hollow groove 4-2, the groove is 300mm long and 15mm wide, three of which are evenly distributed in a circle, and three groups of hollow grooves are distributed longitudinally with a spacing of 85mm. Its structural design can not only ensure that the structural strength is not destroyed by the rotating anchor cable, but also ensure that the anchoring agent can flow out smoothly.

[0047] like Figure 5 As shown, the crushing and stirring member 5 is a hollow sleeve structure, which consists of a conical spiral blade 5-1 and a sleeve. The conical part is 15mm long and has a maximum outer diameter of 21mm. The spiral blade 5-1 with a height of 2mm is welded on the conical body. The spiral blade is a right spiral tooth shape, and 4 pieces are distributed along the circumference, aiming to better crush the anchor bag and match the rotation direction of the drilling rig. The sleeve is made of stainless steel with a length of 40mm, an outer diameter of 25mm, and a thickness of 1.5mm. The outer wall is provided with a second external thread 5-2, which can be connected to the second internal thread 4-3 in the hollow constraint member to push the anchor feeding device. The anchor cable 6 is inserted into the sleeve, and the two are firmly bonded with epoxy resin glue. It is also possible to design a ferrule or other components instead of the gluing method. When the ferrule structure is adopted, one end of the ferrule fixes the outer surface of the anchor cable, and the other end is installed in the sleeve, and the crushing and stirring member 5 is crimped to the front end of the anchor cable.

[0048] When the anchor feeding device is pushed into place, the crushing and stirring member 5 is continuously rotated by the anchor cable 6 to separate the two threads, and then the crushing and stirring member 5 enters the hollow restraining member 4.

[0049] The present invention provides a method for feeding a resin anchoring agent for hole expansion anchoring, comprising the following steps:

[0050] [1] Use a hand drill to drive a conventional drill bit to drill a hole in the tunnel model surrounding rock 1 to the designed depth, and then use a hole reaming machine to reame the conventional anchor hole to form an reamed anchor hole 2. The conventional section diameter of the reamed anchor hole 2 is 32 mm, the reamed section length is 120 mm, and the maximum diameter is 60 mm.

[0051] [2] Install the anchor feeding device and connect the guide cap 3 to one end of the hollow restraining member 4 through the first internal thread 3-2 and the first external thread 4-1;

[0052] 【3】 Figure 6 As shown, the crushing and stirring member 5 is installed, the anchor cable 6 is inserted into the sleeve of the crushing and stirring member 5, and the two are fixed by epoxy resin glue or ferrule crimping;

[0053] 【4】 Figure 7 As shown, two K2360 resin anchors 7 are placed in the hollow restraining member 4, and then one end of the installation guide cap 3 is pushed into the expanded anchor hole 2;

[0054] 【5】Connect the second external thread 5-2 on the surface of the crushing and stirring member with the second internal thread 4-3 inside the hollow restraining member, and push the entire member through the anchor cable 6 until the conical needle 3-1 on the guide cap is inserted into the rock mass at the bottom of the hole. The anchor cable 6 is 2m long and 21.8mm in diameter;

[0055] 【6】 Figure 8 As shown, the anchor cable 6 is manually rotated to disengage the second external thread 5-2 on the surface of the crushing and stirring member 5 from the second internal thread 4-3 inside the hollow restraining member, and the crushing and stirring member enters the interior of the tube body of the hollow restraining member;

[0056] 【7】Connect the drilling rig to drive the anchor cable 6 to stir the resin anchor 7. The mixed anchor flows out of the hollow constraint member 4 from the straight slot 4-2 and enters the expanded anchor hole 2 for solidification. Finally, Fig. 9 result.

[0057] In the present invention, a conical needle is provided at the front end of the guide cap of the resin anchor feeding device. After the anchor feeding device completes pushing, the conical needle is inserted into the rock mass at the bottom of the hole, which can prevent the anchor feeding device from rotating with the anchor cable (rod) to damage the hole wall and affect the anchoring effect. A tooth-shaped spiral blade is also provided on the crushing and stirring component, which can better crush the anchor packaging bag during the rotation process to ensure the stirring effect of the anchor, thereby solving the problem of efficient pushing and sufficient stirring of the resin anchor in the expansion area of ​​the anchor hole. This method can not only realize the integrated construction of the resin anchor feeding and stirring of the anchor cable (rod) in the expansion anchoring mode, but also avoid the "glove effect" during the stirring process of the resin anchor and affect the anchoring effect. The glove effect refers to the phenomenon that the anchor cable (rod) cannot completely crush the resin anchor packaging bag during the stirring process of the resin anchor, and the large pieces of resin anchor bag that are not completely crushed will wrap the curing agent, so that it cannot react with the accelerator to cure and affect the anchoring effect.

[0058] In summary, the present invention provides a resin anchor feeding device and method for hole expansion anchoring, which improves the construction efficiency of anchor cable (rod) hole expansion anchoring while ensuring the anchor agent stirring and anchoring effect in the hole expansion area of ​​the anchor hole.

[0059] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A resin anchoring agent feeding device for hole expansion anchoring, characterized in that: It includes a guide cap, a hollow restraining component and a crushing and stirring component; The front end of the guide cap is provided with a plurality of tapered needles, and the rear end is a sleeve with a first internal thread; The hollow restraining member is a hollow long tube structure, a resin anchor is installed inside the tube body, a hollow groove is opened on the outer circle of the middle part of the tube body, a first external thread matching the first internal thread is arranged at the front end of the tube body, and a second internal thread is arranged at the tail end; The crushing and stirring member is a hollow sleeve structure, the outer ring of the cylinder is provided with a second external thread matching the second internal thread, and the front end of the cylinder is provided with a conical spiral blade; The crushing and stirring member is fixed at the front end of the anchor cable, and enters into the rod body of the hollow restraining member through the rotation of the anchor cable, so as to push and stir the resin anchoring agent.

2. The resin anchoring agent feeding device for hole expansion anchoring according to claim 1, characterized in that: The front end of the guide cap is three conical needles arranged on the bottom surface of the sleeve.

3. The resin anchoring agent feeding device for hole expansion anchoring according to claim 1, characterized in that: Each hollow constraint component includes three groups of hollow grooves, and each group of hollow grooves consists of three straight grooves symmetrically distributed along the circumference.

4. The resin anchoring agent feeding device for hole expansion anchoring according to claim 3, characterized in that: The spacing between two adjacent groups of hollow grooves is 85 mm.

5. The resin anchoring agent feeding device for hole expansion anchoring according to claim 1, characterized in that: The front end of the crushing and stirring component is provided with 4 groups of conical spiral blades.

6. The resin anchoring agent feeding device for hole expansion anchoring according to claim 5, characterized in that: The conical spiral blade has a right-hand spiral tooth structure.

7. The resin anchoring agent feeding device for hole expansion anchoring according to claim 1, characterized in that: The crushing and stirring member is fixed to the front end of the anchor cable by gluing or clamping.

8. A method for delivering a resin anchoring agent using the resin anchoring agent delivery device for hole expansion anchoring according to any one of claims 1 to 7, characterized in that: The following steps are involved: 【1】Expanding and anchoring hole forming; 【2】Connect the guide cap to the front end of the hollow constraint member through threads, fill the hollow constraint member with anchoring agent, and then push the end with the guide cap installed into the expanded anchor hole; 【3】Fix the crushing and mixing component to the front end of the anchor cable; 【4】Connect the installed crushing and stirring member to the second internal thread of the inner ring of the hollow restraining member through the second external thread of the outer ring; 【5】 Push the entire device through the anchor cable until the conical needle on the guide cap is inserted into the rock mass at the bottom of the hole; [6] Manually rotate the anchor cable to disengage the second external thread on the surface of the crushing and stirring member from the second internal thread inside the hollow restraining member, so that the crushing and stirring member enters the interior of the tube body of the hollow restraining member; 【7】The other end of the anchor cable is connected to the drilling rig, which is started to drive the anchor cable to stir the anchoring agent to solidify it.

9. The method for delivering a resin anchoring agent for hole expansion anchoring according to claim 8, characterized in that: In step [3], the crushing and stirring component is fixed to the front end of the anchor cable by gluing or clamping.

Images