Anchor cable resin anchoring central stirring device and working method

Abstract

An anchor cable resin anchoring centering stirring device and working method, comprising an anchor cable body extending into and installed in an anchor hole, wherein the anchor cable body is sequentially provided with a plurality of coaxial drilling auxiliary stirring members and a plurality of auxiliary centering members from top to bottom, wherein the drilling auxiliary stirring members are located in the anchor cable stirring section at the upper part of the anchor hole, and the auxiliary centering members are located in the area below the anchor cable stirring section, and the number of drilling auxiliary stirring members is consistent with the number of resin anchor agent rolls used in the borehole, and the number of auxiliary centering members is determined according to the length of the anchor cable body. The present invention can design and ensure that the anchor cable, the anchor hole, and the resin anchor agent roll are relatively centered and coaxial, so that the generated anchor agent body is uniformly dense within the annular range and firmly bonded to the borehole wall, effectively improving the anchoring force of the anchor cable and the bearing time of its peak strength, effectively controlling the deformation of the surrounding rock mass, and greatly ensuring the safety of personnel and equipment in the roadway or tunnel.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine tunnel support, and particularly relates to an anchor cable resin anchoring centering stirring device and a working method. Background Art

[0002] Anchor cable resin anchor support is the main form of support for underground coal mine tunnels, geotechnical engineering tunnels and deep high-stress metal mines. It has been widely used at home and abroad. Especially for weak surrounding rock masses, the anchoring performance of conventional anchor cables is generally poor. Most conventional anchor cable anchor support in this surrounding rock environment is difficult to meet the anchor cable anchor support requirements under working conditions such as high stress, weak and broken surrounding rock, and easy delamination. At the same time, during the drilling process of conventional anchor cables, their stirring ends often seriously damage the borehole wall, thereby affecting the overall stability of the anchor system. The anchoring performance of the anchor system plays a key role in the support effect. Since stirring the resin anchoring agent is an important process in the anchor bolt anchoring project, the stirring effect of the resin anchoring agent and whether the formed annular anchoring agent is uniform and dense are closely related to the anchoring performance.

[0003] However, the current anchor cable anchoring still uses the traditional resin anchoring method, that is, using ordinary anchor cables to directly stir the resin anchor agent roll for anchoring or adding a stirring head to the stirring end to stir the resin anchor agent roll. This method cannot fully and effectively crush and evenly stir the resin anchor agent under the central limited working conditions, nor can it block the outflow of the resin anchor agent. Especially in weak surrounding rock, the anchoring effect is even worse. Therefore, the development of an anchor cable resin anchoring central stirring device and the proposal of an anchor cable resin anchoring central stirring device and working method have important engineering and social significance for improving the anchor cable anchoring quality. Summary of the Invention

[0004] In order to address the deficiencies in the prior art, the present invention provides an anchor cable resin anchoring central stirring device and a working method, which can avoid the problem that due to long-distance drilling of the anchor cable, the anchor cable has large deflection, and the anchor cable stirring end damages the borehole wall, resulting in several hole wall breakages in the anchoring area or the drilling area space becomes enlarged and incomplete, resulting in the accumulation of part of the resin anchor agent without stirring reaction. At the same time, it can effectively ensure that the anchor cable, the borehole, and the resin anchor agent are coaxially centered with each other. The anchoring medicine body generated after the resin anchor agent is stirred and crushed is uniformly dense within the annular range and firmly bonded to the borehole wall, and can block the downward outflow of the resin anchor agent, thereby ensuring the density of the anchoring medicine body within the designed anchoring length to the greatest extent, greatly improving the anchoring effect of the anchor cable resin.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: an anchor resin anchoring centering stirring device, comprising an anchor body extended into and installed in the anchor hole, the anchor body being provided with a plurality of coaxial drilling auxiliary stirring members and a plurality of auxiliary centering members in sequence from top to bottom, the drilling auxiliary stirring members being located in the anchor stirring section at the upper part of the anchor hole, the auxiliary centering members being located in the area below the anchor stirring section, the distance between the lowest drilling auxiliary stirring member and the uppermost auxiliary centering member being set to 50-70 cm, the distance between two adjacent auxiliary centering members being set to 60-80 cm, the number of drilling auxiliary stirring members being consistent with the number of resin anchor agent rolls used in the borehole, and the number of auxiliary centering members being determined according to the length of the anchor body.

[0006] Each drilling auxiliary stirring component includes a stirring steel cylinder which is mounted on and bonded to the outside of the anchor body. The outer circle of the stirring steel cylinder is provided with a right spiral stirring blade. The uppermost end of the right spiral stirring blade is a sharp thin sheet structure. Several first migration through holes are evenly opened on the right spiral stirring blade.

[0007] The mixing steel cylinder has a height of 40mm, an outer diameter of 20mm and an inner diameter of 18mm. The right spiral mixing blade is welded to the outer circle of the mixing steel cylinder starting from the bottom of the mixing steel cylinder; the right spiral mixing blade is 4mm wide and 1.5mm thick; the first migration hole is a circular hole with a diameter of 3mm, which is the axial migration channel of the resin anchor during stirring.

[0008] Each auxiliary centering component includes an inner steel cylinder and an outer steel cylinder arranged on the same center line. The inner steel cylinder is mounted on and bonded to the outside of the anchor body. A cylindrical cavity is formed between the outer circle of the inner steel cylinder and the inner circle of the outer steel cylinder, and a right-hand guide blade is provided in the cylindrical cavity. A number of second transport through holes are evenly opened on the right-hand guide blade.

[0009] The inner steel cylinder is 40mm high, 20mm in outer diameter and 18mm in inner diameter; the outer steel cylinder is 40mm high, 29mm in outer diameter and 25mm in inner diameter; the right-hand guide blade is 4mm wide and 1.5mm thick; the inner and outer sides of the right-hand guide blade are welded to the outer circle of the inner steel cylinder and the inner circle of the outer steel cylinder respectively; the second transport hole on the right-hand guide blade is a circular hole with a diameter of 3.5mm, which serves as the axial transport channel for the coal rock powder slag in the anchor hole during anchor stirring and advancement.

[0010] A working method of an anchor cable resin anchoring central stirring device comprises the following steps:

[0011] (1) Drill anchor holes in the roof of the coal mine roadway according to the design parameters of the anchor cable support;

[0012] (2) According to the designed anchoring length, resin anchoring agent roll length and anchor hole depth, several drilling auxiliary stirring components and several auxiliary centering components are sequentially inserted into the relevant set positions of the anchor body for bonding and fixing;

[0013] (3) Use the stirring end at the upper end of the anchor body to support the bottom end of the resin anchoring agent roll and start the anchor rod;

[0014] (4) Start the anchor drilling rig, connect and fix the anchor cable body to the rotor of the anchor drilling rig through the anchor cable connector, and use reasonable power mixing parameters to drive the anchor cable body to perform clockwise mixing and drilling movement. The anchor drilling rig slowly and evenly pushes the anchor cable body and the resin anchor agent roll into the anchor hole. Under the transmission action of the anchor cable body, several drilling auxiliary mixing components and several auxiliary centering components begin to synchronize with the anchor cable body to mix and drill in the anchor hole clockwise;

[0015] (5) As the anchor cable body is drilled, when the resin anchor agent is stirred by the anchor cable body and moves downward along the anchor hole wall to the drilling auxiliary stirring component, the drilling auxiliary stirring component will drill clockwise with its right spiral stirring blade to perform a secondary stirring, crushing and mixing action on the resin anchor agent, and can stir the anchor cable stirring section in the center, while transporting the resin anchor agent downward, to ensure that the resin anchor agent in the area where the component passes through is firmly bonded to the borehole wall to the greatest extent;

[0016] (6) When the anchor cable body continues to drill to the bottom of the anchor hole, the auxiliary centering member gradually penetrates into the anchor hole along with the anchor cable body, and keeps the anchor cable body and the anchor hole centered in real time, ensuring the anchoring effect and the uniform distribution of the generated anchoring agent within the annular range. When the resin anchor moves to the first auxiliary centering member adjacent to the drilling auxiliary stirring member, it passes through the right-handed guide vane between the inner and outer steel cylinders and the resin anchoring agent that can be blocked to prevent it from flowing downward, thereby ensuring that the actual anchoring length is evenly and densely filled with the fully reacted resin anchoring agent, thus completing the anchoring;

[0017] (7) Install the anchor cable tray and lock and pre-tighten it to complete the anchor cable anchoring work.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0019] 1. The present invention has a reliable principle, simple structure, and is easy to prepare. It can be widely used in anchor cable resin anchoring support projects and has significant engineering value.

[0020] 2. The present invention can design and ensure that the anchor cable, drill hole (anchor hole), and resin anchor agent roll are relatively centered and coaxial, so that the generated anchor agent body is uniform and dense within the annular range and firmly adheres to the drill hole wall.

[0021] 3. Each drilling auxiliary stirring component of the present invention stirs the resin anchor on the premise of ensuring the centering of the anchor cable during drilling. The first migration hole provides a channel to accelerate the downward migration of the resin anchor. Each auxiliary centering component ensures the centering of the anchor cable body. At the same time, the second migration hole on the right-hand guide blade between the inner steel cylinder and the outer steel cylinder serves to guide the coal rock powder slag in the anchor hole downward. When the resin anchor migrates downward to the auxiliary centering component, the right-hand guide blade can effectively block the downward outflow of the resin anchor, thereby ensuring the density of the anchoring agent within the designed anchoring length to the greatest extent.

[0022] 4. The present invention can effectively improve the anchoring force of the anchor cable and the bearing time of its peak strength, effectively control the deformation of the surrounding rock mass, and greatly ensure the safety of personnel and equipment in the roadway or tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is an enlarged view of the drilling auxiliary stirring component;

[0025] Figure 3 This is an enlarged view of the auxiliary centering component.

[0026] The reference numerals in the figure are, 1-anchor body, 2-drilling auxiliary stirring component, 3-auxiliary centering component, 4-stirring steel cylinder, 5-right spiral stirring blade, 6-first transport hole, 7-inner steel cylinder, 8-outer steel cylinder, 9-right-hand guide blade, 10-second transport hole. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 3 As shown, an anchor cable resin anchoring centering stirring device of the present invention includes an anchor cable body 1 extended into and installed in the anchor hole, and the anchor cable body 1 is sequentially provided with a plurality of coaxial drilling auxiliary stirring members 2 and a plurality of auxiliary centering members 3 from top to bottom. The drilling auxiliary stirring members 2 are located in the anchor cable stirring section at the upper part of the anchor hole, and the auxiliary centering members 3 are located in the area below the anchor cable stirring section. The distance between the lowest drilling auxiliary stirring member 2 and the uppermost auxiliary centering member 3 is set to 50-70 cm, and the distance between two adjacent auxiliary centering members 3 is set to 60-80 cm. The number of drilling auxiliary stirring members 2 is consistent with the number of resin anchor agent rolls used in the borehole, and the number of auxiliary centering members 3 is determined according to the length of the anchor cable body 1.

[0028] Each drilling auxiliary stirring member 2 includes a stirring steel cylinder 4 which is fitted and bonded to the outside of the anchor body 1. The outer circle of the stirring steel cylinder 4 is provided with a right spiral stirring blade 5. The uppermost end of the right spiral stirring blade 5 is a sharp thin sheet structure. A number of first migration through holes 6 are evenly opened on the right spiral stirring blade 5.

[0029] The stirring steel cylinder 4 has a height of 40 mm, an outer diameter of 20 mm, and an inner diameter of 18 mm. The right spiral stirring blade 5 is welded to the outer circle of the stirring steel cylinder 4 starting from the bottom end of the stirring steel cylinder 4; the right spiral stirring blade 5 has a width of 4 mm and a thickness of 1.5 mm; the first migration hole 6 is a circular hole with a diameter of 3 mm, which is the axial migration channel of the resin anchor during stirring.

[0030] Each auxiliary centering member 3 includes an inner steel cylinder 7 and an outer steel cylinder 8 arranged on the same center line. The inner steel cylinder 7 is mounted on and bonded to the outside of the anchor body 1. A cylindrical cavity is formed between the outer circle of the inner steel cylinder 7 and the inner circle of the outer steel cylinder 8, and a right-handed guide blade 9 is provided in the cylindrical cavity. A number of second transport through holes 10 are evenly opened on the right-handed guide blade 9.

[0031] The inner steel cylinder 7 is 40 mm high, 20 mm in outer diameter and 18 mm in inner diameter; the outer steel cylinder 8 is 40 mm high, 29 mm in outer diameter and 25 mm in inner diameter; the right-hand guide blade 9 is 4 mm wide and 1.5 mm thick; the inner and outer sides of the right-hand guide blade 9 are welded to the outer circle of the inner steel cylinder 7 and the inner circle of the outer steel cylinder 8 respectively; the second migration hole 10 on the right-hand guide blade 9 is a circular hole with a diameter of 3.5 mm, which serves as an axial migration channel for the coal rock powder slag in the anchor hole during anchor stirring and advancement.

[0032] A working method of an anchor cable resin anchoring central stirring device comprises the following steps:

[0033] (1) Drill anchor holes in the roof of the coal mine roadway according to the design parameters of the anchor cable support;

[0034] (2) According to the designed anchoring length, resin anchoring agent roll length and anchor hole depth, several drilling auxiliary stirring members 2 and several auxiliary centering members 3 are sequentially inserted into the relevant set positions of the anchor body 1 and bonded and fixed;

[0035] (3) Use the stirring end at the upper end of the anchor body 1 to press against the bottom end of the resin anchoring agent roll to start the anchor rod;

[0036] (4) Start the anchor drilling rig, connect and fix the anchor cable body 1 to the rotor of the anchor drilling rig through the anchor cable connector, and use reasonable power stirring parameters to drive the anchor cable body 1 to perform clockwise stirring and drilling movement. The anchor drilling rig slowly and evenly pushes the anchor cable body 1 and the resin anchor agent roll into the anchor hole. Under the transmission action of the anchor cable body 1, several drilling auxiliary stirring components 2 and several auxiliary centering components 3 begin to stir and drill in the anchor hole synchronously with the anchor cable body 1 in a clockwise direction;

[0037] (5) As the anchor cable body 1 is drilled, when the resin anchor agent is stirred by the anchor cable body 1 and moves downward along the wall of the anchor hole to the drilling auxiliary stirring member 2, the drilling auxiliary stirring member 2 will drill clockwise with its right spiral stirring blade 5 to perform a secondary stirring, crushing and mixing action on the resin anchor agent, and can stir the anchor cable stirring section in the center, while transporting the resin anchor agent downward, to ensure that the resin anchor agent in the area where the component passes is firmly bonded to the wall of the drill hole to the greatest extent;

[0038] (6) When the anchor cable body 1 continues to drill to the bottom of the anchor hole, the auxiliary centering member 3 gradually penetrates into the anchor hole along with the anchor cable body 1, and keeps the anchor cable body 1 centered with the anchor hole in real time, ensuring the anchoring effect and the uniform distribution of the generated anchoring agent within the annular range. When the resin anchor moves to the first auxiliary centering member 3 adjacent to the drilling auxiliary stirring member 2, it passes through the right-handed guide vane 9 between the inner steel cylinder 7 and the outer steel cylinder 8 and blocks the resin anchor, preventing it from flowing downward, thereby ensuring that the actual anchoring length is evenly and densely filled with the fully reacted resin anchor, thus completing the anchoring;

[0039] (7) Install the anchor cable tray and lock and pre-tighten it to complete the anchor cable anchoring work.

[0040] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of protection of the technical solution of the present invention.

Claims

1. An anchor cable resin anchoring central stirring device, comprising an anchor cable body inserted into an anchor hole, characterized in that: The anchor cable body is sequentially provided with a number of coaxial drilling auxiliary stirring members and a number of auxiliary centering members from top to bottom. The drilling auxiliary stirring members are located in the anchor cable stirring section at the upper part of the anchor hole, and the auxiliary centering member is located in the area below the anchor cable stirring section. The distance between the lowest drilling auxiliary stirring member and the uppermost auxiliary centering member is set to 50-70 cm, and the distance between two adjacent auxiliary centering members is set to 60-80 cm. The number of drilling auxiliary stirring members is consistent with the number of resin anchor agent rolls used in the borehole, and the number of auxiliary centering members is determined according to the length of the anchor cable body. Each drilling auxiliary stirring member includes a stirring steel cylinder which is mounted on and bonded to the outside of the anchor body. The outer circle of the stirring steel cylinder is provided with a right spiral stirring blade. The uppermost end of the right spiral stirring blade is a sharp thin sheet structure. A plurality of first migration through holes are evenly opened on the right spiral stirring blade. The mixing drum is 40mm high, 20mm in outer diameter, and 18mm in inner diameter. The right-hand spiral mixing blade is welded to the outer diameter of the mixing drum from the bottom. The right-hand spiral mixing blade is 4mm wide and 1.5mm thick. The first migration hole is a circular hole with a diameter of 3mm, which serves as the axial migration channel for the resin anchoring agent during stirring. Each auxiliary centering member includes an inner steel cylinder and an outer steel cylinder arranged on the same center line. The inner steel cylinder is mounted on and bonded to the outside of the anchor cable body. A cylindrical cavity is formed between the outer circle of the inner steel cylinder and the inner circle of the outer steel cylinder. A right-hand guide vane is arranged in the cylindrical cavity. A plurality of second transport through holes are evenly opened on the right-hand guide vane. The inner steel cylinder is 40mm high, 20mm in outer diameter, and 18mm in inner diameter. The outer steel cylinder is 40mm high, 29mm in outer diameter, and 25mm in inner diameter. The right-hand guide vane is 4mm wide and 1.5mm thick. The inner and outer sides of the right-hand guide vane are welded to the outer and inner circles of the inner and outer steel cylinders, respectively. The second migration hole on the right-hand guide vane is a circular hole with a diameter of 3.5mm, which serves as an axial migration channel for coal and rock powder slag in the anchor hole during anchor cable stirring and advancement. Each drilling auxiliary stirring component stirs the resin anchor agent with a right spiral stirring blade under the premise of ensuring that the anchor cable is drilled in the center. The first migration hole provides a channel to accelerate the downward migration of the resin anchor agent. Each auxiliary centering component ensures the centering of the anchor cable body. At the same time, the second migration hole on the right-hand guide blade between the inner steel cylinder and the outer steel cylinder serves to guide the coal rock powder slag in the anchor hole downward. When the resin anchor agent migrates downward to the auxiliary centering component, the right-hand guide blade can effectively block the downward outflow of the resin anchor agent, thereby ensuring the density of the anchoring agent within the designed anchoring length to the greatest extent.

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