An expansion plug for a grouted anchor and method of use thereof

Abstract

This invention discloses an expandable grout-stopping plug for grouting anchor bolts and its application method, relating to the field of geotechnical and mining engineering technology. It includes an expandable grout-stopping plug body, a grout-stopping plug bracket, a fixing bracket, and a flexible sleeve. The expandable grout-stopping plug body has a hollow through-hole structure and contains a static expanding agent. The grout-stopping plug bracket is disposed at both axial ends of the expandable grout-stopping plug body for axial constraint. The fixing bracket is disposed at the bottom of the grout-stopping plug bracket for supporting the bracket. The flexible sleeve is sleeved on the outside of the expandable grout-stopping plug body and the grout-stopping plug bracket. The expandable grout-stopping plug provided by this invention applies an axial constraint to the expandable grout-stopping plug body using the grout-stopping plug bracket. Under axial constraint, it guides the plug to expand radially, pressing the anchor bolt against the inner wall of the borehole. This achieves a good grout-stopping effect and solidifies into a hard and dense hardened body, improving the reliability of the grout-stopping seal.

Description

Technical Field

[0001] This invention relates to the field of geotechnical mining engineering technology, specifically to an expansion plug for grouting anchor bolts and its application method. Background Technology

[0002] In geotechnical engineering and mining engineering, grouting anchor support technology involves injecting cement grout with a binding effect into weak and fractured rock masses through boreholes and joints in the rock mass under high pressure. This fills the joints and fissures in the fractured rock mass and spreads over a large area under high pressure. After the cement grout solidifies, it binds the fractured rock mass into a whole, effectively improving the loose structure of the fractured rock mass and increasing its strength and surrounding rock stability. Due to these advantages, grouting anchor support technology is currently widely used in underground mines, open-pit slopes, tunnel engineering, and other fields.

[0003] As can be seen from the grouting anchor support mechanism, a higher grouting pressure means that the cement grout can generate a larger and more uniform diffusion range in the fractured rock mass, thereby achieving a better surrounding rock reinforcement support effect. The magnitude of the grouting pressure mainly depends on two aspects: the grouting pressure that the grouting equipment can provide and the grout-stopping effect of the grouting borehole. If either of these aspects fails, the grouting pressure will not reach the design requirements, thus greatly reducing the grouting anchor support effect. Existing grouting equipment technology is mature and can provide corresponding grouting pressure according to project requirements. However, the grouting stop technology of traditional grouting anchors is still at a low level. Generally, disposable grout stop plugs made of frustum-shaped rubber or hard plastic are used. They are manually hammered into the borehole and rely on the elasticity of the material itself to compress the inner wall of the borehole to stop the grouting. Due to the limited deformation capacity of the plug, it is not possible to generate sufficient pressure on the anchor and the inner wall of the borehole. When the grouting pressure is high, or when the surrounding rock of the borehole is highly fractured and the borehole shape is poor, gaps are easily formed between the outer edge of the grout stop plug and the borehole wall. This can easily lead to grout overflow, grout leakage, grout spraying, or even hole punching, which greatly affects the grouting support effect.

[0004] To address the problems of traditional grouting anchor bolt sealing technology, researchers have conducted relevant studies and invented various novel grout-stopping plugs that can improve the grout-stopping effect. Among them, Chinese patent application CN107654249A discloses a novel combined grout-stopping plug for anchor bolts and cables. This plug is made of elastic material and consists of inner and outer parts. The combined plug is pushed into the borehole using the thrust of a pre-tightening bolt and a tray, sealing the grout from two different areas: inside and outside the borehole, thus improving the grout-stopping effect to some extent. However, this patent only improves upon the traditional grout-stopping plug and is still limited by the deformation range and sealing capacity of the elastic material. For high-pressure grouting processes, the grout-stopping effect of this plug is still insufficient.

[0005] Chinese patent CN102296603B discloses a grout-stopping plug and grout-stopping system for anchor bolts (anchor cables). The grout-stopping plug body is made of rubber and includes components such as an injection pipe, an exhaust pipe, and an overflow hole. In use, the grout-stopping device must be pre-fixed to the anchor bolt (anchor cable). Then, the entire anchor bolt (anchor cable) with the grout-stopping device is inserted into the borehole. During grouting, the grout first enters the rubber airbag through the overflow hole. The airbag expands radially under the pressure of the grout, sealing the borehole and achieving effective grout-stopping. This invention requires the pre-positioning and fixing of the anchor rod (anchor cable) and the grout-stopping device before use, and then the whole assembly is inserted into the borehole, making the operation process complex. The special requirement that the grout-stopping device must be fixed to the anchor rod (anchor cable) before use cannot be achieved in most grouting anchor construction processes, which greatly limits the scope of application of this invention patent. In use, this invention requires the connection of multiple pipelines and the observation and control of valves, which requires a high level of operator skill. Moreover, the structure is relatively complex and the processing cost is high, which increases the construction cost of grouting anchor support. Summary of the Invention

[0006] The main objective of this invention is to provide an expansion plug for grouting anchors and its application method, in order to solve the problems existing in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] An expansion grout stopper for grouting anchor bolts includes an expansion grout stopper body, a grout stopper bracket, a fixed bracket, and a flexible sleeve. The expansion grout stopper body has a hollow through-hole structure and contains a static expansion agent. The grout stopper bracket is disposed at both axial ends of the expansion grout stopper body for axial constraint. The fixed bracket is disposed at the bottom of the grout stopper bracket for supporting the grout stopper bracket. The flexible sleeve is sleeved on the outside of the expansion grout stopper body and the grout stopper bracket.

[0009] Furthermore, the main body of the expansion grout stopper is a cylindrical paper tube with a dense static expansion agent inside. The diameter of the through hole is larger than the diameter of the grouting anchor rod, and the outer diameter of the expansion grout stopper body is 2mm-3mm smaller than the diameter of the drill hole.

[0010] Furthermore, the grout stopper bracket includes a circular thin sheet, a steel wire, and a limiting pin. The circular thin sheet is disposed at both axial ends of the expansion grout stopper body, the steel wire is disposed on the inner wall of the circular thin sheet, and the limiting pin is engaged with the steel wire.

[0011] Furthermore, there are two annular sheets, namely a first annular sheet and a second annular sheet. The first annular sheet is disposed at the bottom of the expansion grout stopper body, and the second annular sheet is disposed at the top of the expansion grout stopper body. The bottom of the steel wire is welded to the first annular sheet, and the second annular sheet is provided with a perforation, through which the top of the steel wire passes.

[0012] Furthermore, a row of grooves is provided on the side wall of the steel wire, with a spacing of 2mm between the grooves, and the limiting pin is engaged in the groove.

[0013] Furthermore, the fixing bracket includes a steel wire and a slot, the slot being engaged with the bottom of the annular sheet, and the steel wire being fixedly disposed at the bottom of the slot.

[0014] Furthermore, the slot is formed by folding and bending a thin sheet of iron.

[0015] Furthermore, the flexible sleeve is a rubber tube or a silicone tube, the inner diameter of the flexible sleeve is the same as the outer diameter of the expansion grout stopper body, the wall thickness of the flexible sleeve is 0.5mm-1.0mm, and the length of the flexible sleeve is 20mm longer than the length of the expansion grout stopper body.

[0016] A method for using an expansion plug for grouting anchors includes the following steps:

[0017] S1. At the location where grouting anchor bolt support is required by the design, drill grouting anchor bolt holes of the corresponding diameter and depth, insert the grouting anchor bolt into the drill hole until it contacts the bottom of the hole, and anchor the end of the grouting anchor bolt inside the drill hole using a resin cartridge or simple anchor head. Hollow grouting anchor bolts are used.

[0018] S2. Select an expansion grout stopper that matches the size of the grouting anchor and the borehole, and combine the expansion grout stopper body, the grout stopper bracket and the fixing bracket.

[0019] S3. Soak the assembled expansion grout stop plug in water for 6-8 minutes until the main body of the expansion grout stop plug absorbs water to saturation. Then take out the expansion grout stop plug and put the flexible sleeve on it so that it covers the outer side of the expansion grout stop plug body and the grout stop plug bracket. Then send the whole assembly into the borehole along the grouting anchor rod and fix it.

[0020] S4. According to the grouting pressure requirements of the grouting anchor support process, after the static expansion agent reacts with water for 30 minutes, the main body of the expansion grout stop plug undergoes rapid expansion. During the entire expansion process, the main body of the expansion grout stop plug is subject to axial constraint and undergoes large expansion deformation in the radial direction. At this time, it is subject to radial constraint of the borehole inner wall, which in turn generates a large pressure on the borehole inner wall and the grouting anchor rod, so that the inner wall of the expansion grout stop plug and the anchor rod, and the outer wall of the expansion grout stop plug and the borehole inner wall are tightly bonded together, thereby firmly fixing the expansion grout stop plug and the grouting anchor rod in the borehole. After the expansion grout stop plug body expands, it generates high pressure acting on the anchor rod and the borehole, realizing high-pressure tight sealing of the grouting borehole opening, so that it can meet the grouting stop requirements during high-pressure grouting.

[0021] S5. According to the design requirements of grouting anchor support, perform high-pressure grouting on the grouting anchor. After the grouting is completed and the grout in the borehole has solidified, install a tray at the end of the anchor that is exposed in the surrounding rock, tighten the pre-tightening nut, and complete the grouting anchor construction process.

[0022] Furthermore, the specific assembly method of the expansion grout stopper is as follows: Align the first circular thin plate with welded steel wire with the bottom end of the expansion grout stopper body, insert the tip of the steel wire and pass it out from the other end of the expansion grout stopper body, so that the central through hole of the expansion grout stopper body corresponds to the central circular hole of the circular thin plate. Insert the second circular thin plate with a perforation along the steel wire. At this time, the expansion grout stopper body is located between the two circular thin plates. Insert the limiting pins into the grooves on the steel wire respectively, clamp and fix the expansion grout stopper body in the two circular thin plates. Then, insert the slot into the edge of the circular thin plate at the bottom of the grout stopper bracket. Weld one end of the steel wire and the slot together at a certain angle to form a stable "narrow at the top and wide at the bottom" three-legged fixed support structure. At this point, the expansion grout stopper assembly is completed.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By using a grout stopper bracket to apply an axial constraint to the body of the expansion grout stopper, under the condition of axial constraint, it is guided to expand in the radial direction, squeezing the grouting anchor rod tightly against the inner wall of the borehole. Under the condition of obtaining a better grout stopper sealing effect, it solidifies into a hard and dense hardened body, thereby improving the reliability of grout stopper sealing.

[0025] 2. By expanding and increasing the pressure of the flexible casing, the high-pressure radial extrusion between the grouting anchor and the borehole wall generates a large axial friction force, which is suitable for grouting anchor support processes with various grouting pressures.

[0026] 3. The present invention has a simple structure and is easy to operate. It is not affected by drilling equipment and grouting anchor bolt process during construction, and has low requirements for the operator's skill level, resulting in low labor intensity for workers during construction.

[0027] 4. This invention can be mass-produced in factories with low production costs, reducing the cost of grouting anchor bolt support process. It is also easy to carry, has a fast response speed, and improves the working efficiency of grouting anchor bolt support. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the working state of the present invention in drilling.

[0030] Among them, 1—steel wire, 2—groove, 3—circular thin sheet, 4—static expansion agent, 5—circular cylindrical paper tube, 6—flexible sleeve, 7—grouting anchor rod, 8—inner wall of borehole, 9—anchor rod through hole. Detailed Implementation

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Example 1

[0033] Combination Figures 1 to 2 This invention provides an expansion grout stopper for grouting anchor bolts, comprising an expansion grout stopper body, a grout stopper bracket, a fixed bracket, and a flexible sleeve 6. The expansion grout stopper body has a hollow through-hole structure and contains a static expansion agent 4. The grout stopper bracket is disposed at both axial ends of the expansion grout stopper body for axial constraint. The fixed bracket is disposed at the bottom of the grout stopper bracket for supporting the grout stopper bracket. The flexible sleeve 6 is sleeved on the outside of the expansion grout stopper body and the grout stopper bracket.

[0034] Preferably, the main body of the expansion plug is a cylindrical paper tube 5, with a dense static expansion agent inside. The diameter of the through hole is larger than the diameter of the grouting anchor rod 7, and the outer diameter of the expansion plug body is 2mm-3mm smaller than the borehole diameter. The hollow through hole allows the grouting anchor rod 7 to pass through, so the diameter of the through hole is slightly larger than the outer diameter of the grouting anchor rod 7. In this embodiment, the paper tube is made of newsprint, which has advantages such as dense texture, good toughness, strong water permeability, and high tensile strength in a cylindrical shape. It is made into a special cylindrical container to achieve a dense encapsulation of the powdered static expansion agent 4. The paper tube completely encloses the static expansion agent 4 in its internal space. The static expansion agent 4 is a highly expandable inorganic powder material that expands rapidly in volume within a certain time (30 minutes) after being mixed with an appropriate amount of water. It is also called a "static breaking agent" or "static blasting agent". During the expansion process, the material generates high pressure under constrained conditions, which can compress the expansion product into a dense and hardened body with high strength, close to that of concrete.

[0035] Preferably, the grout stopper bracket includes a circular thin plate 3, a steel wire 1, and a limiting pin. The circular thin plate 3 is disposed at both axial ends of the expansion grout stopper body, the steel wire 1 is disposed on the inner wall of the circular thin plate 3, and the limiting pin is engaged with the steel wire 1. In this embodiment, the circular thin plate 3 is a steel circular thin plate 3, and the steel wire 1 is a hard steel wire 1. The circular hole in the center of the steel circular thin plate 3 has a diameter slightly larger than the diameter of the grouting anchor rod 7, allowing the grouting anchor rod 7 to pass through.

[0036] In this embodiment, the main function of the grout stopper bracket is to fix and axially constrain the body of the expansion grout stopper. The internal space formed by the steel ring thin plates 3 at both ends of the grout stopper bracket is used to place the body of the expansion grout stopper, and it is fixed by inserting a limiting pin after passing through the expansion grout stopper body with a hard steel wire 1. Since the static expansion agent 4 has the characteristic of isotropy during the expansion process, the expansion is non-directional when unconstrained. In order to make full use of its radial expansion in the borehole to squeeze the grouting anchor rod 7 and the borehole wall to achieve a good sealing effect, the grout stopper bracket is used to apply an axial constraint to the body of the expansion grout stopper. Under the condition of axial constraint, it is guided to expand in the radial direction, squeezing the grouting anchor rod 7 tightly against the inner wall 8 of the borehole. Under the condition of obtaining a good grout stop sealing effect, it solidifies into a hard and dense hardened body, improving the reliability of the grout stop sealing.

[0037] Preferably, there are two annular sheets 3, which are parallel to each other and are respectively the first annular sheet and the second annular sheet. The first annular sheet is located at the bottom of the expansion grout stopper body, and the second annular sheet is located at the top of the expansion grout stopper body. The bottom of the steel wire 1 is welded to the inner side of the first annular sheet. The second annular sheet has a perforation, and the top of the steel wire 1 passes through the perforation. The end of the hard steel wire 1 is pointed to facilitate passing through the expansion grout stopper body.

[0038] Preferably, the steel wire 1 has a row of grooves on its side wall, with a spacing of 2mm between the grooves, and the limiting pin engages within the grooves. The grooves allow the limiting pin to be inserted, thereby controlling the distance between the two steel ring sheets 3.

[0039] Preferably, the fixing bracket includes a steel wire 1 and a slot 2. The slot 2 is engaged with the bottom of the annular sheet 3, and the steel wire 1 is fixedly disposed at the bottom of the slot 2. In this embodiment, the steel wire 1 is a rigid steel wire, and the slot 2 is formed by bending a rigid thin iron sheet. The gap in the slot 2 formed between the bent rigid thin iron sheets can be wedged into the edge of the steel annular sheet 3 at the bottom of the grout stopper bracket and tightly clamped. One end of the rigid steel wire 1 is welded to the slot 2 structure at a certain angle. There are three fixing brackets, forming a stable "narrow at the top and wide at the bottom" three-legged bracket structure, which supports the entire grout stopper bracket with the expansion grout stopper body fixed thereon. Its main function is: when the expansion grout stop plug is inserted into the borehole as a whole, there is a certain gap between the outer edge of the expansion grout stop plug body and the grout stop plug bracket and the inner wall 8 of the borehole, so that the expansion grout stop plug cannot be fixed in a certain position in the borehole. However, the special structure of the fixing bracket, which is "narrow at the top and wide at the bottom", and the good elasticity of the hard steel wire 1, can firmly fix the expansion grout stop plug in the internal space of the borehole opening.

[0040] Preferably, the flexible sleeve 6 is a rubber or silicone tube with good elasticity and deformation properties. The inner diameter of the flexible sleeve 6 is the same as the outer diameter of the expansion grout stopper body, the wall thickness of the flexible sleeve 6 is 0.5mm-1.0mm, and the length of the flexible sleeve 6 is 20mm longer than the length of the expansion grout stopper body. Its main function is to tightly wrap the hydration reaction products when the expansion grout stopper body expands in the borehole due to hydration reaction, preventing the hydration products from overflowing along the gaps in the borehole inner wall 8 in the early stage of the reaction, thereby increasing the radial expansion force of the expansion grout stopper and improving the high-pressure grout stopping effect.

[0041] Example 2

[0042] A method for using an expansion plug for grouting anchors includes the following steps:

[0043] S1. At the location where grouting anchor rod 7 needs to be supported, drill grouting anchor rod holes of corresponding diameter and depth, insert grouting anchor rod 7 into the drill hole until it contacts the bottom of the hole, and anchor the end of grouting anchor rod 7 inside the drill hole using resin cartridge or simple anchor head. The grouting anchor rod 7 is a hollow type.

[0044] S2. Select an expansion grout stopper that matches the size of the grouting anchor rod 7 and the drilling size. Combine the expansion grout stopper body, the grout stopper bracket, and the fixed bracket. The specific combination method is as follows: Align the first circular thin plate with the steel wire 1 welded on it with the bottom end of the expansion grout stopper body, slowly insert the tip of the steel wire 1, and pass it out from the other end of the expansion grout stopper body so that the central through hole of the expansion grout stopper body corresponds to the central circular hole of the circular thin plate 3. Insert the second circular thin plate with the perforation along the steel wire 1. At this time, the expansion grout stopper body is located between the two circular thin plates 3. Insert the limiting pins into the grooves on the steel wire 1 respectively, clamp and fix the expansion grout stopper body in the two circular thin plates 3. Then, insert the slot 2 into the edge of the circular thin plate 3 at the bottom of the grout stopper bracket. Weld one end of the steel wire 1 and the slot 2 together at a certain angle to form a stable "narrow at the top and wide at the bottom" three-legged fixed bracket structure. At this point, the expansion grout stopper is assembled.

[0045] S3. Soak the assembled expansion grout stop plug in water for 6-8 minutes until the expansion grout stop plug body absorbs water to saturation. Then take out the expansion grout stop plug and put the flexible sleeve 6 on it so that it wraps and covers the outer side of the expansion grout stop plug body and the grout stop plug bracket. Then send the whole assembly into the borehole along the grouting anchor rod 7 in the borehole and fix it.

[0046] S4. According to the grouting pressure requirements of the grouting anchor 7 support process, after the static expansion agent 4 reacts with water for 30 minutes, the main body of the expansion grout stop plug undergoes rapid expansion. During the entire expansion process, the main body of the expansion grout stop plug is subject to axial constraint, resulting in a large expansion deformation in the radial direction. At this time, it is subject to radial constraint by the inner wall 8 of the borehole, which in turn generates a large pressure on the inner wall 8 of the borehole and the rod body of the grouting anchor 7. This makes the inner wall of the expansion grout stop plug and the rod body of the anchor 7, as well as the outer wall of the expansion grout stop plug and the inner wall 8 of the borehole, tightly bonded together. This firmly fixes the expansion grout stop plug and the grouting anchor 7 in the borehole. Because the expansion grout stop plug generates high pressure after expansion, it acts on the anchor 7 and the borehole, achieving a high-pressure tight seal at the grouting borehole opening, thus meeting the grouting stop requirements during high-pressure grouting.

[0047] S5. In accordance with the support design requirements of grouting anchor 7, high-pressure grouting operation is carried out on grouting anchor 7. After the grouting is completed and the grout in the borehole solidifies, a tray is installed at the end of the anchor exposed in the surrounding rock, and the pre-tightening nut is tightened to complete the construction process of grouting anchor 7.

[0048] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method of using an expansion plug for a grouted anchor, characterized in that, The method comprises the following steps: S1, drilling a grouting anchor hole with a corresponding aperture and depth at a position where grouting anchor support is required, inserting a grouting anchor into the hole until it contacts the bottom, anchoring the end of the grouting anchor inside the hole with a resin cartridge or a simple anchor head, and using a hollow grouting anchor; S2, selecting an expansion grout stopper matched with the size of the grouting anchor and the hole, and combining the expansion grout stopper body, the grout stopper bracket, and the fixing bracket; S3, soaking the combined expansion grout stopper in water for 6-8 minutes, then taking it out after the expansion grout stopper body is saturated with water, and then sleeving a flexible sleeve around the expansion grout stopper body and the grout stopper bracket, and then sending the whole into the hole along the grouting anchor body and fixing it; S4, reacting the static expansion agent with water for 30 minutes according to the grouting pressure requirement of the grouting anchor support process, and then the expansion grout stopper body expands rapidly, the expansion grout stopper body is axially constrained and deforms greatly in the radial direction during the expansion process, and the expansion grout stopper body is radially constrained by the inner wall of the hole, thereby generating a large pressure on the inner wall of the hole and the grouting anchor body, so that the inner wall of the expansion grout stopper and the grouting anchor body and the outer wall of the expansion grout stopper and the inner wall of the hole are tightly combined, thereby fixing the expansion grout stopper and the grouting anchor in the hole, and the expansion grout stopper body generates a high pressure on the anchor and the hole after expansion, thereby achieving a high-pressure and tight sealing of the grouting hole, and meeting the grout stopping requirement during high-pressure grouting; S5, performing high-pressure grouting on the grouting anchor according to the design requirement of the grouting anchor support, and after the grouting is completed, installing a tray at the end of the anchor exposed to the surrounding rock, tightening the pre-tightening nut, and completing the grouting anchor construction process; The specific combination method of the expansion grout stopper is as follows: aligning the first circular sheet with the steel wire welded thereon with the bottom end of the expansion grout stopper body, inserting the steel wire tip into the expansion grout stopper body, and then passing the steel wire out of the other end of the expansion grout stopper body, so that the central through hole of the expansion grout stopper body corresponds to the central circular hole of the circular sheet, the second circular sheet with a through hole is sleeved on the steel wire, the expansion grout stopper body is clamped and fixed between the two circular sheets by inserting the limiting clamping pins into the grooves on the steel wire, and the expansion grout stopper body is clamped and fixed between the two circular sheets by inserting the limiting clamping pins into the grooves on the steel wire, and the clamping groove is inserted into the edge of the circular sheet at the lower part of the grout stopper bracket, and the steel wire is welded to the clamping groove at a certain angle to form a stable three-legged fixed bracket structure with a narrow upper part and a wide lower part, and the expansion grout stopper is combined; An expansion grout stopper for a grouting anchor comprises an expansion grout stopper body, a grout stopper bracket, a fixing bracket, and a flexible sleeve, the expansion grout stopper body is a hollow through hole structure, and a static expansion agent is arranged inside, the grout stopper bracket is arranged at the axial ends of the expansion grout stopper body and is used for axially constraining the expansion grout stopper body, the fixing bracket is arranged at the bottom of the grout stopper bracket and is used for supporting the grout stopper bracket, and the flexible sleeve is sleeved outside the expansion grout stopper body and the grout stopper bracket. The stop plug carrier comprises a circular ring sheet, a steel wire and a limiting pin, the circular ring sheet is arranged at the axial two ends of the expanded stop plug body, the steel wire is arranged on the inner wall of the circular ring sheet, and the limiting pin is clamped on the steel wire; The number of the circular ring sheets is two, which are a first circular ring sheet and a second circular ring sheet, the first circular ring sheet is arranged at the bottom of the expanded stop plug body, the second circular ring sheet is arranged at the top of the expanded stop plug body, the bottom of the steel wire is welded on the first circular ring sheet, the second circular ring sheet is provided with a perforation, and the top of the steel wire penetrates through the perforation; The fixing support comprises a steel wire and a clamping groove, the clamping groove is clamped at the bottom of the circular ring sheet, and the steel wire is fixedly arranged at the bottom of the clamping groove; The number of the fixing supports is three, forming a stable three-legged support structure with "narrow top and wide bottom", which supports the whole stop plug carrier with the expanded stop plug body.

2. A method of using an expansion plug for a grouting anchor according to claim 1, characterized in that The expanded stop plug body is a circular column paper tube, the internal space is filled with dense static expanding agent, the through hole diameter is greater than the diameter of the grouting anchor rod, and the outer diameter of the expanded stop plug body is smaller than the drilling diameter by 2mm-3mm.

3. A method of using an expansion plug for a grouting anchor according to claim 1, characterized in that A row of grooves is arranged on the side wall of the steel wire, the distance between the grooves is 2mm, and the limiting pin is clamped in the grooves.

4. A method of using an expansion plug for a grouting anchor according to claim 1, characterized in that The clamping groove is formed by folding a thin iron sheet.

5. A method of using an expansion plug for a grouting anchor according to claim 1, wherein, The flexible sleeve is a rubber tube or a silica gel tube, the inner diameter of the flexible sleeve is the same as the outer diameter of the expanded stop plug body, the wall thickness of the flexible sleeve is 0.5mm-1.0mm, and the length of the flexible sleeve is greater than the length of the expanded stop plug body by 20mm.

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