Tension type grouting anchor rod

Abstract

The present application relates to the technical field of tunnel anchor rod, and particularly discloses a tensile grouting anchor rod, which comprises a hollow anchor rod body, the end of the anchor rod body inserted into a borehole is a grout outlet, grout is sprayed from the grout outlet along the axial direction of the anchor rod body, a deformation tensile part is movably arranged at the grout outlet, the deformation tensile part can be separated from the anchor rod body and collide with the inner wall of the borehole to generate extrusion deformation with a larger cross-sectional area under the action of the axial pressure generated by the grout, a rotating tensile part parallel to the axis of the anchor rod body is hinged to the sidewall of the anchor rod body, and the deformation tensile part drives the rotating tensile part to rotate to an inclined state with an included angle with the axis of the anchor rod body when the deformation tensile part is separated along the axial direction of the anchor rod body. The present application can increase the contact area between the anchor rod and the grouting body, thereby improving the tensile capacity, enhancing the anchoring capacity of the anchor rod, and ensuring the safety of the tunnel support project.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel anchor rod, in particular to a tensile type grouting anchor rod. BACKGROUND

[0002] In tunnel engineering, the tunnel usually passes through the mountain, and the soil layer structure of the mountain in different regions is different. For some soft soil layer mountains, the stability is poor, and the mountain above the tunnel and the inner wall of the tunnel need to be reinforced to improve the stability of the mountain. The commonly used method is to use anchor rod support. Because of the simple structure, convenient construction and strong engineering adaptability, the anchor rod becomes a common support method and is commonly used in various tunnel, mine roadway support engineering and the like.

[0003] The conventional anchor rod construction process is the process of inserting the anchor rod after withdrawing the drill rod and grouting. The friction between the anchor rod and the grouting body is used to realize the reinforcement of the fractured rock mass of the tunnel mountain. However, the existing anchor rod has limited tensile resistance, and the contact area between the anchor rod and the grouting body is limited. The friction generated is not enough to support the deformation of the surrounding rock, so that the anchor rod is pulled out of the grouting body. The anchoring effect of the anchor rod cannot be effectively played, the tensile resistance is weak, the support force of the anchor rod is insufficient, and the safety of the tunnel engineering is difficult to be guaranteed. SUMMARY

[0004] The purpose of the present application is to provide a tensile type grouting anchor rod, which improves the contact area between the anchor rod and the grouting body to improve the tensile resistance, enhances the support capacity of the anchor rod, and ensures the safety of the tunnel engineering.

[0005] To solve the above technical problems, the present application adopts the following scheme:

[0006] A tensile type grouting anchor rod, comprising a hollow anchor rod body arranged on the tunnel wall, an injection grouting device connected to the end of the anchor rod body outside the drill hole, the end of the anchor rod body extending into the drill hole being a grout outlet, the grout being sprayed from the grout outlet along the axial direction of the anchor rod body, the grout outlet movably provided with a deformation tensile part, the deformation tensile part being able to separate from the anchor rod body and impact the inner wall of the drill hole to produce extrusion deformation with larger cross-sectional area under the action of the axial pressure of the grout, a rotating tensile part being hinged to the side wall of the anchor rod body and parallel to the axial line of the anchor rod body, the deformation tensile part driving the rotating tensile part to rotate to an inclined state with an included angle with the axial line of the anchor rod body when the deformation tensile part separates along the axial direction of the anchor rod body.

[0007] In the scheme, the anchor rod program annularly distributes on the tunnel inner wall, the anchor rod body is hollow design, the hollow structure is as the slurry delivery channel, realizes internal grouting function, reduces the external pipeline complexity, the slurry outlet is located at the anchor rod front end, the slurry is ejected along the axial direction, directly acts on the drilling bottom and gradually fills the slurry and fills the entire drilling to the drilling outside, the slurry outlet is the end large flow slurry outlet, the slurry output is large and fast. The deformation tensile part can be separated from the anchor rod body, the reaction force generated when the slurry is ejected pushes the deformation tensile part to separate from the anchor rod, after separating, high-speed impact the drilling inner wall, by extrusion deformation can be inserted into the rock-soil, thereby increasing the contact area with the rock-soil body, after subsequent grouting, the deformed deformation tensile part also increases the contact surface with the grouting body, forms stronger mechanical anchoring force, the initial state of the rotating tensile part is parallel to the anchor rod axis, reduces the insertion resistance, when the deformation tensile part separates, the rotating tensile part is rotated to the inclined state, after inclining, forms wedge-shaped occlusion with the drilling wall and the grouting body, increases the lateral friction force, resists the pullout load, improves the support capacity of the tunnel.

[0008] After the anchor rod is inserted into the drilling, high-pressure slurry is injected through the hollow channel, the slurry is ejected at high speed from the slurry outlet, axial reaction force is generated, the deformation tensile part activates the reaction force to push the deformation tensile part to separate from the anchor rod, to high-speed impact the drilling inner wall, after impact, the deformation tensile part is extruded and deformed, forms an enlarged head, increases the end bearing area,

[0009] At the same time, the rotating tensile part triggers the linkage mechanism when the deformation tensile part separates, rotates the rotating tensile part to the inclined state, the inclined rotating tensile part generates lateral pressure with the drilling wall, provides additional tensile capacity through friction force, the slurry fills the gap between the drilling and the anchor rod, forms a grouting body after solidification, further enhances the anchoring force, through the linkage mechanism of slurry pressure-deformation-tensile, improves the pullout resistance of the anchor rod, so that the anchor rod has better application range, such as tunnel, mine roadway support, etc.

[0010] Optionally, a connecting rod is hinged between the deformation tensile part and the rotating tensile part, when the deformation tensile part separates from the anchor rod body, the connecting rod drives the rotating tensile part to rotate to the inclined state with an angle to the anchor rod body axis.

[0011] Optionally, the deformation tensile part includes a deformation head, the deformation head includes an upper plate, a lower plate and a deformation plate, one end of the deformation plate is connected with the upper plate, the other end is connected with the upper plate, the deformation plate is annularly spaced and distributed multiple, the side of the lower plate facing the slurry outlet is provided with a fitting groove matched with the diameter of the anchor rod body, the end of the anchor rod body located in the drilling is inserted into the fitting groove.

[0012] Optionally, the deformation plate is an outward protruding arc-shaped plate, multiple deformation plates and the upper plate and the lower plate form a lantern-shaped structure.

[0013] Optionally, the thickness of the middle part of the deformation plate is smaller than the thickness of the two ends.

[0014] Optionally, the side of the slurry outlet is provided with a guide rod fixedly connected with the anchor rod body, the guide rod extends to the outside of the deformation head through the lower plate and the upper plate, the guide rod is located inside the deformation plate, and an end of the guide rod away from the anchor rod body is connected with a baffle matched with the size of the drill hole.

[0015] Optionally, the rotation anti-tension part comprises an anti-tension rod, a plurality of grooves for accommodating the anti-tension rod are distributed on the circumferential side wall of the anchor rod body, one end of the anti-tension rod adjacent to the slurry outlet is hingedly connected with the bottom wall of the groove, and the other end of the anti-tension rod is connected with one end of a connecting rod, and the other end of the connecting rod is hingedly connected with the side wall of the lower plate of the deformation anti-tension part.

[0016] Optionally, the bottom wall of the groove is provided with a limiting groove allowing the anti-tension rod to rotate within a range of 0-90°.

[0017] Optionally, the side wall of the groove is a rough surface.

[0018] Optionally, the anchor rod body is provided with a backing plate located outside the drill hole, a sealing ring is arranged between the backing plate and the drill hole, the sealing ring is sleeved on the anchor rod body, a tapered hole opposite to the backing plate is arranged on the side wall of the sealing ring, a tapered plate capable of being inserted into the tapered hole is arranged on the side surface of the backing plate, a nut is arranged on the side of the backing plate away from the sealing ring, a plurality of gas outlets adjacent to the drill hole orifice are formed in the circumferential side wall of the anchor rod body, a gas outlet flow channel in communication with the gas outlets is arranged on the inner wall of the anchor rod body, and the gas outlet flow channel is in communication with the external atmosphere.

[0019] The present application has the beneficial effects that:

[0020] In the present application, after the anchor rod is inserted into the drill hole in the inner wall of the tunnel or the mountain above the tunnel, high-pressure slurry is injected through the hollow channel, the slurry is sprayed at high speed from the slurry outlet, an axial reaction force is generated, the deformation anti-tension part is activated by the reaction force to push the deformation anti-tension part away from the anchor rod, and the deformation anti-tension part impacts the inner wall of the drill hole at high speed. After the impact, the deformation anti-tension part is extruded and deformed to form an enlarged head, the end bearing area is increased, and at the same time, the rotation anti-tension part triggers the linkage mechanism when the deformation anti-tension part is separated, so that the rotation anti-tension part is rotated to an inclined state. The inclined rotation anti-tension part generates a lateral pressure on the wall of the drill hole, and the friction force provides additional anti-tension capacity. The slurry fills the gap between the drill hole and the anchor rod, and forms a grouting body after solidification, further enhancing the supporting force. Through the linkage mechanism of slurry pressure-deformation-anti-tension, the pullout resistance of the anchor rod is improved, so that the anchor rod has a better application range, such as tunnel and mine roadway support. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a structural schematic diagram of the present application;

[0022] Figure 2 The figure is a structural schematic diagram of the deformation anti-tension part after being extruded;

[0023] Figure 3 This is a schematic diagram of the planar structure after the tensile deformation section has been compressed.

[0024] Figure 4 This is a top view of the groove structure;

[0025] Figure 5 This is a 3D view of the lower plate;

[0026] Figure 6 This is a diagram of the anchoring system consisting of steel pipe piles, lattice beams, and anchor rods above the tunnel.

[0027] Reference numerals: 1-Anchor bolt body, 2-Drill hole, 3-Deformation end cap, 301-Lower plate, 3011-Assembly groove, 302-Upper plate, 303-Deformation plate, 4-Guide rod, 5-Baffle, 6-Tension rod, 7-Connecting rod, 8-Hinge seat, 9-Groove, 10-Limiting groove, 11-Air outlet, 12-Air outlet channel, 13-Sealing ring, 14-Panace, 15-Nut, 16-Steel pipe pile, 17-Grid beam, 18-Grouting outlet, 19-Conical plate, 20-Tunnel. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0029] A tensile-resistant grouting anchor bolt includes a hollow anchor bolt body 1 installed on the wall of a tunnel 20. The end of the anchor bolt body 1 located outside the borehole 2 is connected to a grouting device. The end of the anchor bolt body 1 extending into the borehole 2 is a grout outlet 18. Grout is sprayed out from the grout outlet 18 along the axial direction of the anchor bolt body 1. The grout outlet 18 is movably provided with a deformation tensile part. Under the axial pressure generated by the grout, the deformation tensile part can detach from the anchor bolt body 1 and impact the inner wall of the borehole 2 to produce a compressive deformation with an increased cross-sectional area. A rotating tensile part is hinged to the side wall of the anchor bolt body 1 and is parallel to the axis of the anchor bolt body 1. When the deformation tensile part detaches along the axial direction of the anchor bolt body 1, it drives the rotating tensile part to rotate to an inclined state with an angle to the axis of the anchor bolt body 1.

[0030] In this embodiment, the anchor rod body is annularly distributed on the inner wall of the tunnel 20, the anchor rod body 1 is hollow designed, the hollow structure is used as a slurry conveying channel, the conveying channel is parallel to the axis of the anchor rod body 1, the internal grouting function is realized through the conveying channel, the complexity of the external pipeline is reduced, the slurry outlet 18 is located at the front end of the anchor rod, the front end refers to the end of the anchor rod body 1 located in the borehole 2, the end of the anchor rod body 1 located outside the borehole 2 can be called the rear end, the rear end is the slurry inlet end, the rear end is connected with the grouting device, the grouting device is the prior art, which can be a grouting pump, the slurry is sprayed along the axial direction, directly acts on the bottom of the borehole 2 and gradually fills the entire borehole 2 with slurry outside the borehole 2, the slurry outlet 18 is a large-flow slurry outlet at the end, the slurry outlet is large and fast. The deformation tensile part can be separated from the anchor rod body 1 at a certain speed under the action of the axial pressure of the slurry, the reaction force generated when the slurry is sprayed pushes the deformation tensile part to separate from the anchor rod, and after separation, the deformation tensile part impacts the inner wall of the borehole 2 at high speed, and through extrusion deformation, the deformation tensile part can be inserted into the rock-soil of the tunnel 20 in the circumferential direction, so as to increase the contact area with the rock-soil body of the tunnel 20. After subsequent grouting, the deformed deformation tensile part also increases the contact area with the grouting body, forming stronger mechanical anchoring force, the initial state of the rotating tensile part is parallel to the anchor rod axis, reducing the insertion resistance, when the deformation tensile part separates, the rotating tensile part is rotated to an inclined state, after the inclination, the rotating tensile part forms a wedge-shaped engagement with the borehole 2 wall and the grouting body, increasing the lateral friction force to resist the pulling load.

[0031] As shown in Figure 1 , after the anchor rod is inserted into the borehole 2 of the inner wall of the tunnel 20, high-pressure slurry is injected through the hollow channel, the slurry is sprayed at high speed from the slurry outlet 18, generating an axial reaction force, the deformation tensile part activates the reaction force to push the deformation tensile part to separate from the anchor rod, and impacts the inner wall of the borehole 2 at high speed, as shown in Figure 2 , after the impact, the deformation tensile part is extruded and deformed to form an enlarged head, increasing the end bearing area, and at the same time, the rotating tensile part triggers the linkage mechanism when the deformation tensile part separates, so that the rotating tensile part is rotated to an inclined state, the inclined rotating tensile part generates a lateral pressure on the borehole 2 wall, providing additional tensile resistance through friction, the slurry fills the gap between the borehole 2 and the anchor rod, and after solidification, forms a grouting body, further enhancing the anchoring force, through the linkage mechanism of slurry pressure-deformation-tensile resistance, the pulling resistance of the anchor rod is improved, so that the anchor rod has a better application range, such as tunnel 20, mine roadway support, etc.

[0032] As shown in Figure 6As shown, for the tunnel 20 mountain of soft soil layer, before the tunnel 20 is opened, the mountain above the tunnel 20 needs to be reinforced to improve the stability of the mountain above the tunnel 20. In this embodiment, the steel pipe pile 16 for the tunnel 20 is first driven into the position above the tunnel 20, and the lattice beam 17 is arranged on the side wall of the mountain on both sides of the tunnel 20, the anchor rod is inserted into the mountain above the tunnel 20 and connected with the lattice beam 17, so that the anti-pulling type grouting anchor rod and the steel pipe pile 16 and the lattice beam 17 jointly constitute a composite anchoring system to reinforce the mountain above the tunnel 20 and improve the stability of the mountain above the tunnel 20, and the steel pipe pile 16 and the lattice beam 17 are prior art. At the same time, during the process of opening the tunnel 20, the anti-pulling type anchor rod in this embodiment is also used to drive the semi-circular ring into the inner wall of the tunnel 20, to anchor the mountain near the wall of the tunnel 20 and further improve the stability of the tunnel 20 to avoid tunnel collapse.

[0033] The lattice beam 17 is a grid formed by a plurality of cross beams and longitudinal beams, the anchor rod is arranged at the intersection of the cross beam and the longitudinal beam, and the anchor rod is inserted into the mountain above the tunnel 20 to fix the lattice beam 17. The anchoring system can be used for tunnel 20, mine roadway support, etc.; the anchoring system is used to reinforce the mountain above the tunnel 20, to improve the stability and integrity of the tunnel 20 and the safety of the tunnel 20 project; the anchoring system is easy to operate and has low requirements on equipment, only small drilling equipment is needed, and the implementation process has little disturbance to existing structures, and the implementation of the anchoring system is beneficial to the stability of the tunnel 20.

[0034] Further, the connecting rod 7 is hinged between the deformation anti-pulling part and the rotating anti-pulling part, and when the deformation anti-pulling part is separated from the anchor rod body 1, the connecting rod 7 drives the rotating anti-pulling part to rotate to an inclined state with an included angle with the axis of the anchor rod body 1.

[0035] Specifically, the connecting rod 7, as a rigid or flexible connecting piece between the deformation anti-pulling part and the rotating anti-pulling part, converts the axial separation movement of the deformation anti-pulling part into the rotating movement of the rotating anti-pulling part, ensures that the rotating anti-pulling part responds immediately when the deformation anti-pulling part is activated, avoids the risk of anchoring failure caused by time lag, replaces the complex gear, cam or hydraulic linkage mechanism, reduces the manufacturing cost and failure rate, and the connecting rod 7 can be selected from high-strength steel or flexible chain / rope.

[0036] Working principle:

[0037] The slurry is sprayed from the slurry outlet 18 to generate an axial reaction force to push the deformed tensile part away from the anchor body 1, the deformed tensile part moves in the axial direction at a high speed, the connecting rod 7 applies a pulling force to the rotating tensile part, the rotating tensile part rotates in the rotating stage, the deformed tensile part pulls the connecting rod 7 when it is separated, and the rotating tensile part rotates around the hinge point to an inclined state (such as an angle of 30°-60° with the axis), the inclined structure of the rotating tensile part increases the contact area with the wall of the drill hole 2, and the enlarged head of the deformed tensile part provides end support, forming a "end + lateral" double anchoring system, the slurry fills the gap and solidifies to convert the mechanical anchoring force into chemical bonding force, and long-term stable bearing is realized.

[0038] After the rotating tensile part is inclined, the normal pressure between the rotating tensile part and the wall of the drill hole 2 increases, the friction coefficient increases, and the tensile strength is significantly improved (experiments show that it can be improved by 30%-50%). The connecting rod 7 disperses the concentrated stress of the deformed tensile part to the rotating tensile part, so that the local stress does not become too large to cause the anchor rod to break. In soft rock or broken stratum above the tunnel 20, the deformed tensile part can penetrate into the fissure, and the rotating tensile part is expanded by the connecting rod 7 to form a wider anchoring area. Under dynamic load such as earthquake or blasting vibration, the elastic deformation of the flexible connecting rod 7 can absorb part of the energy, reduce the relative displacement between the anchor rod and the rock-soil body of the tunnel 20, and prevent anchoring failure.

[0039] Further, the deformed tensile part comprises a deformed head 3, the deformed head 3 comprises an upper plate 302, a lower plate 301 and a deformed plate 303, one end of the deformed plate 303 is connected with the upper plate 302, the other end is connected with the upper plate 302, the deformed plate 303 is annularly spaced and distributed in multiple, the side of the lower plate 301 facing the slurry outlet 18 is provided with a fitting groove 3011 matched with the diameter of the anchor body 1, and the end of the anchor body 1 located in the drill hole 2 is inserted into the fitting groove 3011.

[0040] Specifically, as shown in Figure 5 After the anchor rod is inserted into the drill hole 2, the deformed head 3 is fixed to the end of the anchor rod through the fitting groove 3011, the deformed plate 303 is contracted between the upper plate 302 and the lower plate 301, the overall outer diameter is slightly smaller than the diameter of the drill hole 2, and the deformed tensile part is convenient to penetrate, the slurry is sprayed from the slurry outlet 18 to generate an axial reaction force, the lower plate 301 is pushed to move relative to the upper plate 302, the upper plate 302 is limited by the bottom wall of the drill hole 2, the lower plate 301 continuously approaches the upper plate 302 under the action of the slurry pressure, the deformed plate 303 is forced to expand outward and is extruded and deformed under pressure, as shown in Figure 3 The deformed tensile part after deformation is inserted into the rock soil in a zigzag shape in the axial direction, the contact area with the rock soil of the tunnel 20 is increased, the drill hole 2 is filled with slurry, and after the slurry solidifies, a composite anchoring system of "mechanical engagement + chemical bonding" is formed, and the tensile strength is significantly improved.

[0041] The cross-sectional area of the deformed tensile part after extrusion increases significantly, so the diameter of the anchoring end can be increased to several times that of the original anchor rod, significantly improving the end bearing capacity. The serrated surface of the deformation plate 303 is embedded in the rock-soil body of the tunnel 20 to a depth of 5-15 mm, the friction angle increases by 15°-20°, and the shear strength increases by more than 40%. The annular distribution of the deformation plate 303 disperses the concentrated stress to multiple contact points, avoiding local stress that is too large causing the tunnel 20 rock-soil body to break or the anchor rod to break. After the slurry solidifies, the deformation plate 303 forms an integral whole with the rock-soil body, and the stress transmission is more uniform.

[0042] Further, the deformation plate 303 is an outwardly protruding arc-shaped plate, and a plurality of deformation plates 303 form a lantern-like structure with the upper plate 302 and the lower plate 301.

[0043] Specifically, the arc-shaped plate is outwardly protruding arc-shaped, and the curvature radius is optimized according to the diameter of the borehole 2 and the length of the anchor rod (usually 1.2-1.5 times the radius of the borehole 2), ensuring that after unfolding, it forms a surface contact with the borehole 2 wall rather than a line contact. 6-12 arc-shaped plates are evenly arranged along the circumference, with an included angle of 30°-60° between adjacent plates, forming a three-dimensional structure similar to a lantern skeleton, balancing the bending stiffness and local stress concentration, and avoiding edge tearing during unfolding. When the anchor rod is inserted into the borehole 2, the arc-shaped plate is constrained between the upper plate 302 and the lower plate 301, and the overall outer diameter is smaller than the diameter of the borehole 2 (usually reduced by 20%-30%), facilitating deep insertion. After the lower plate 301 is pushed by the slurry pressure, the arc-shaped plate expands radially outward, with plastic deformation occurring in the middle first, forming a "petal-shaped" anchoring end and inserting into the rock-soil, and the middle of the arc-shaped plate deforms first to form a "serrated" surface, embedding in the rock-soil body to a depth of 5-15 mm, with a mechanical interlocking force increased by more than 50%.

[0044] Further, the thickness of the middle part of the deformation plate 303 is less than the thickness of the two ends. Specifically, the thin area in the middle of the deformation plate 303 deforms first during the pressure process, allowing the deformation plate 303 to deform in the designed manner to better form the enlarged part to enhance the anchoring capacity.

[0045] Further, the slurry outlet 18 side is provided with a guide rod 4 fixedly connected with the anchor rod body 1, the guide rod 4 extends through the lower plate 301 and the upper plate 302 to the outside of the deformation head 3, the guide rod 4 is located inside the deformation plate 303, and the end of the guide rod 4 away from the anchor rod body 1 is connected with a baffle 5 matched with the size of the borehole 2. The length of the guide rod 4 is less than the height of the deformation head 3.

[0046] Specifically, the guide rod 4 provides a guide function for the movement of the upper plate 302 and the lower plate 301. Under the action of the slurry pressure, the entire deformation tensile part can move along the axis direction of the anchor rod body 1. The baffle 5 is made of hard steel plate and is in contact with the bottom wall of the drill hole 2. During the grouting process, the pressure of the slurry impacts the lower plate 301 and pushes the upper plate 302 to move. The upper plate 302 is in rigid contact with the baffle 5. The lower plate 301 continues to move close to the upper plate 302, thereby extruding the deformation plate 303. The length of the guide rod 4 is less than the height of the deformation head 3, so that the lower plate 301 and the upper plate 302 have sufficient moving displacement length to make the deformation plate 303 be extruded and deformed.

[0047] The baffle 5 is adapted to the aperture of the drill hole 2. During the process of inserting the anchor rod body 1 into the drill hole 2, the baffle 5 can push the falling soil or gravel to the bottom of the hole, avoiding the problem of blockage in the slurry delivery flow channel in the middle of the anchor rod body 1. At the same time, the baffle 5 can also clean the soil and gravel in the drill hole 2 to the bottom of the hole, so that the quality of the grouting body is higher. The grouting body is the state after the slurry is solidified and formed in the drill hole 2.

[0048] Further, the rotation tensile part includes a tensile rod 6. A plurality of grooves 9 for accommodating the tensile rod 6 are distributed on the circumferential side wall of the anchor rod body 1. One end of the tensile rod 6 adjacent to the slurry outlet 18 is hinged to the bottom wall of the groove 9. The other end of the tensile rod 6 is connected to one end of the connecting rod 7. The other end of the connecting rod 7 is hinged to the side wall of the lower plate 301 of the deformation tensile part.

[0049] Specifically, in the initial state (unforced), the tensile rod 6 is completely embedded in the groove 9. The connecting rod 7 is parallel to the axis of the anchor rod body 1. The deformation tensile part is not unfolded. The overall structure is compact, which is convenient for installation in the drill hole 2.

[0050] When the deformation head 3 moves, the connecting rod 7 is pulled through the hinged seat 8 of the lower plate 301. The connecting rod 7 rotates freely in the hinged seat 8 and transmits the pulling force to the tensile rod 6. The tensile rod 6 rotates around the hinged seat 8 of the bottom wall of the groove 9 and gradually rotates out of the groove 9, forming an inclined support. After the slurry solidifies, a mechanical engagement is formed with the grouting body. The tensile rod 6 and the anchor rod body 1 jointly bear the pulling force, thereby improving the pull-out resistance of the anchor rod.

[0051] Further, the bottom wall of the groove 9 is provided with a limiting groove 10 allowing the tensile rod 6 to rotate within a range of 0-90°.

[0052] Specifically, as shown in FIG. 6, the tensile rod 6 is provided with a plurality of limiting grooves 11. The limiting grooves 11 are arranged in the circumferential direction of the tensile rod 6. The limiting grooves 11 are arranged in the circumferential direction of the tensile rod 6. The limiting grooves 11 are arranged in the circumferential direction of the tensile rod 6. Figure 4As shown, a limiting groove 10 is opened at the position close to the hinge point of the bottom wall of the groove 9, the limiting groove 10 is an arc-shaped groove 9, after the rotation of the tension rod 6, the lower end of the tension rod 6 is located in the limiting groove 10 and contacts with the side wall of the hole 2 adjacent to the hole of the limiting groove 10, so as to limit the rotation range of the tension rod 6, and at the same time, after the subsequent slurry solidification, when the anchor rod is subjected to tension, the limitation of the limiting groove 10 to the tension rod 6 can further improve the anti-pulling capacity.

[0053] Further, the side wall of the groove 9 is a rough surface.

[0054] Specifically, the rough surface of the side wall of the groove 9 can increase the friction between the tension rod 6 and the groove 9, so as to avoid the tension rod 6 from falling out of the groove 9 when the tension rod 6 is not subjected to the pulling force of the connecting rod 7.

[0055] Further, the anchor rod body 1 is provided with a backing plate 14 located outside the drill hole 2, a sealing ring 13 is arranged between the backing plate 14 and the drill hole 2, the sealing ring 13 is sleeved on the anchor rod body 1, a tapered hole is arranged on the side wall of the sealing ring 13 opposite to the backing plate 14, a tapered plate 19 is arranged on the side of the backing plate 14 which can be inserted into the tapered hole, a nut 15 is arranged on the side of the backing plate 14 away from the sealing ring 13, a plurality of air outlets 11 are arranged on the circumferential side wall of the anchor rod body 1 adjacent to the hole of the drill hole 2, an air outlet flow channel 12 is arranged on the inner wall of the anchor rod body 1 and communicates with the air outlets 11, and the air outlet flow channel 12 is connected with the external atmosphere.

[0056] Specifically, the sealing ring 13 is sleeved on the anchor rod body 1 and located between the backing plate 14 and the drill hole 2, so as to play a role of preliminary sealing and prevent the substances (such as water, slurry, etc.) in the drill hole 2 from leaking to the outside. The tapered hole on the side wall of the sealing ring 13 and the tapered plate 19 on the side of the backing plate 14 are matched with each other, when the tapered plate 19 is inserted into the tapered hole, the sealing effect can be further enhanced to ensure the reliability of the sealing. The tapered matching design can make the sealing more tight and can withstand a certain pressure. The nut 15 on the side of the backing plate 14 away from the sealing ring 13 is used to fix the position of the backing plate 14 and the sealing ring 13, by tightening the nut 15, the pressure can be applied to the backing plate 14 to press the sealing ring 13 tightly, so that the sealing ring 13 can better fit the anchor rod body 1 and the wall of the drill hole 2, and the sealing performance is improved.

[0057] The plurality of air outlets 11 on the circumferential side wall of the anchor rod body 1 are arranged close to the hole of the drill hole 2, which plays a role of discharging the air in the drill hole 2 during the installation of the anchor rod, when the slurry is injected into the drill hole 2, the air will enter the air outlet flow channel 12 in the anchor rod body 1 through the air outlets 11, and then be discharged to the external atmosphere through the air outlet flow channel 12, so as to avoid the air resistance in the drill hole 2, which affects the installation quality of the anchor rod and the anchoring effect, the air outlets 11 are arranged close to the hole of the drill hole 2, so that the slurry will not enter the air outlets 11 until the drill hole 2 is filled with the slurry, which avoids the slurry from blocking the air outlets 11 in advance.

[0058] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. According to the technical essence of the present application, any simple modification, equivalent replacement and improvement of the above embodiment within the spirit and principle of the present application are still within the protection scope of the technical solution of the present application.

Claims

1. A tensioned type grouting anchor rod comprising a hollow anchor rod body (1) provided on a tunnel (20) wall, an end of the anchor rod body (1) outside a borehole (2) being connected with a grouting device, characterized in that, The end of the anchor rod body (1) extending into the borehole (2) is a slurry outlet (18), the slurry is sprayed from the slurry outlet (18) along the axis direction of the anchor rod body (1), the slurry outlet (18) movably has a deformation tensile part, the deformation tensile part can be separated from the anchor rod body (1) and collide with the inner wall of the borehole (2) to generate extrusion deformation with larger cross-sectional area under the action of the axial pressure of the slurry, the side wall of the anchor rod body (1) is hingedly connected with a rotating tensile part parallel to the axis of the anchor rod body (1), the rotating tensile part is driven to rotate to an inclined state with an included angle with the axis of the anchor rod body (1) when the deformation tensile part is separated along the axis direction of the anchor rod body (1); The deformation tensile part and the rotating tensile part are hingedly connected with a connecting rod (7), the rotating tensile part is driven to rotate to an inclined state with an included angle with the axis of the anchor rod body (1) by the connecting rod (7) when the deformation tensile part is separated from the anchor rod body (1); The deformation tensile part includes a deformation head (3), the deformation head (3) includes an upper plate (302), a lower plate (301) and deformation plates (303), one end of the deformation plate (303) is connected with the upper plate (302), the other end is connected with the upper plate (302), the deformation plates (303) are annularly and spacedly distributed, the side of the lower plate (301) facing the slurry outlet (18) is provided with a fitting groove (3011) matched with the diameter of the anchor rod body (1), the end of the anchor rod body (1) located in the borehole (2) is inserted into the fitting groove (3011); The rotating tensile part includes a tensile rod (6), the circumferential side wall of the anchor rod body (1) is provided with a plurality of grooves (9) for accommodating the tensile rod (6), one end of the tensile rod (6) adjacent to the slurry outlet (18) is hingedly connected with the bottom wall of the groove (9), the other end away from the slurry outlet (18) is connected with one end of the connecting rod (7), the other end of the connecting rod (7) is hingedly connected with the side wall of the lower plate (301) of the deformation tensile part.

2. A tension-type grouted anchor rod as claimed in claim 1, wherein, The deformation plates (303) are outwardly protruding arc-shaped plates, and the plurality of deformation plates (303) and the upper plate (302) and the lower plate (301) form a lantern-shaped structure.

3. A tension-type grouted anchor rod according to claim 2, characterized in that, The thickness of the middle part of the deformation plate (303) is smaller than the thickness of the two ends.

4. The tension-type grouting anchor rod according to claim 1, characterized in that, The side surface of the slurry outlet (18) is provided with a guide rod (4) fixedly connected with the anchor rod body (1), the guide rod (4) extends to the outside of the deformation head (3) through the lower plate (301) and the upper plate (302), the guide rod (4) is located inside the deformation plate (303), the end of the guide rod (4) away from the anchor rod body (1) is connected with a baffle (5) matched with the size of the borehole (2), and the length of the guide rod (4) is smaller than the height of the deformation head (3).

5. The tension-type grouting anchor rod according to claim 1, characterized in that, The bottom wall of the groove (9) is provided with a limiting groove (10) allowing the tensile rod (6) to rotate within a range of 0-90°.

6. The tension-type grouting anchor rod according to claim 1, characterized in that, The side wall of the groove (9) is a rough surface.

7. The tension-type grouting anchor rod according to claim 1, characterized in that, The anchor rod body (1) is provided with a base plate (14) outside the borehole (2), a sealing ring (13) is arranged between the base plate (14) and the borehole (2), the sealing ring (13) is sleeved on the anchor rod body (1), a tapered hole opposite to the base plate (14) is arranged on the side wall of the sealing ring (13), a tapered plate (19) capable of being inserted into the tapered hole is arranged on the side of the base plate (14), a nut (15) is arranged on the side of the base plate (14) away from the sealing ring (13), a plurality of gas outlets (11) adjacent to the borehole (2) are arranged on the circumferential side wall of the anchor rod body (1), and a gas outlet flow channel (12) in communication with the gas outlets (11) is arranged on the inner wall of the anchor rod body (1), and the gas outlet flow channel (12) is in communication with the external atmosphere.

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