A rack air bag expansion head anchor rod capable of multiple grouting and recycling and a method for installing and using the same

Abstract

This invention discloses a rack-and-socket enlarged-head anchor bolt capable of multiple grouting injections and recyclability, along with its installation and usage method. Specifically, it includes an anchor bolt, an anti-pull-out head, a comprehensive piping system, an inflatable airbag, and an injection device. The anti-pull-out head, equipped with a pressure plate and an anti-pull-out rack, is screwed to one end of the anchor bolt, providing high pull-out resistance. The comprehensive piping system includes a U-shaped grouting pipe, a solvent pipe, and an inflation pipe, all fixed to the anti-pull-out head along with the inflatable airbag. Each pipe connects to the injection device, enabling inflation of the enlarged-head anchor bolt, multiple grouting injections, and the input of solvent to the anti-pull-out head. This invention achieves high pull-out resistance, multiple grouting injections via the same piping system, and complete recyclability of the anti-pull-out components.

Description

Technical Field

[0001] This invention relates to the field of enlarged head anchor bolts, specifically to a rack and pinion airbag enlarged head anchor bolt that can be grouted multiple times and is recyclable, and its installation and usage method. Background Technology

[0002] Enlarged-head anchor bolts are widely used in projects with high anchor bolt bearing capacity requirements. Their failure modes can be categorized into five types based on the location of failure when the anchor bolt reaches its pull-out limit: ① failure along the contact surface between the grout and the bolt; ② failure along the contact surface between the grout and the soil / rock mass; ③ bolt breakage; ④ shear failure of the grout; ⑤ shear failure of the anchored stratum. When shear failure occurs in the anchored stratum, the enlarged-head anchor bolt bears the overall load, fully utilizing its pull-out resistance. However, for high-strength soil / rock masses, the anchor bolt itself often fails first, limiting the overall pull-out resistance of the anchor bolt. Therefore, improving the pull-out strength of the anchor bolt itself can significantly increase the pull-out resistance of the enlarged-head anchor bolt under load, bringing significant engineering benefits.

[0003] When an anchor bolt resists pull-out, it does so through the interaction between the bolt body and the grout. During this process, the grout is prone to developing load-bearing cracks, which accumulate gradually over time, eventually leading to a failure of the bond strength between the bolt body and the grout, causing the anchor bolt to break along the contact surface. If further grouting reinforcement is desired at this point, new pipes must be driven into the corresponding locations for grout replenishment. The initial grouting pipes used for grouting are unusable due to grout blockage, which is not only wasteful of manpower and resources but also introduces construction errors, potentially resulting in inaccurate grout replenishment at the contact surface. Therefore, it is necessary to consider using existing pipes for multiple grouting operations to maintain the bond strength between the anchor bolt body and the grout, thus extending the anchor bolt's service life.

[0004] Furthermore, enlarged head anchor bolts will remain underground for a long time after use, which will pose hidden dangers to the underground environment and subsequent underground space development. For example, if anchor bolts are encountered during the construction of subway tunnel projects, the tunnel boring machine may be damaged or more dangerous accidents may occur. Therefore, it is necessary to consider the recyclability of enlarged head anchor bolt components.

[0005] Based on the above, designing a rack and pinion airbag enlarged head anchor bolt with high load-bearing capacity, capable of multiple groutings in the same pipeline, and fully recyclable will be of great significance for the application of enlarged body anchor bolts in practical engineering. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rack-and-tooth airbag enlarged head anchor bolt that can be grouted multiple times and is recyclable, as well as its installation and use method. This invention can achieve the goals of high pull-out bearing capacity, multiple grouting in the same pipeline, and complete recyclability of the pull-out resistance component of the enlarged head anchor bolt.

[0007] This invention provides the following technical solution:

[0008] A rack-and-socket enlarged head anchor bolt capable of multiple grouting and recyclability consists of an anchor bolt, an anti-pull-out head, an integrated piping system, an inflatable airbag, and an injection device.

[0009] The pull-out head is screwed to one end of the anchor rod and has a top pressure plate and pull-out rack, which provides high pull-out resistance to the anchor rod.

[0010] The integrated pipeline system includes a U-shaped grouting pipe, a solvent pipe, an air pipe with a two-way valve, a grouting pipe, a grout outlet pipe, and a solvent delivery pipe. All of these, along with the inflatable airbag, are fixed to the pull-out head. Except for the grout outlet pipe, all of these pipes are connected to the injection equipment. The system serves to inflate the enlarged head anchor bolt, perform multiple grouting operations, and input solvent into the pull-out head.

[0011] Furthermore, the pull-out head consists of a top pressure plate, a threaded sleeve, a pull-out rack, several pipe openings and bayonets, all made of high-strength soluble materials;

[0012] The top pressure plate includes a top pressure plate, a second-layer top pressure plate, a third-layer top pressure plate, a fourth-layer top pressure plate, and a bottom pressure plate from top to bottom. The diameter of the top pressure plate and the lower diameter of the bottom pressure plate are relatively smaller than the other top pressure plates in order to facilitate the installation of the upper airbag fixing sleeve and the lower airbag fixing sleeve.

[0013] The threaded sleeve has a threaded hole inside, which allows the anchor rod to be screwed in.

[0014] The pull-out resistance rack comprises 6-section, 5-section, and 4-section long racks, with varying lengths from top to bottom. Each pull-out resistance rack consists of pull-out resistance teeth, a rack tube, and a solvent hole. It is hinged to a limiting thick steel plate via a rotating shaft, allowing the pull-out resistance rack to rotate around the shaft. The opening of the solvent hole is located on the pull-out resistance rack facing the threaded sleeve.

[0015] Furthermore, the arrangement features of the pipe opening and the bayonet are as follows:

[0016] The top pressure plate is provided with several U-shaped tube insertion holes, solvent tube insertion holes, and gas tube insertion holes;

[0017] The second-layer top pressure plate, the third-layer top pressure plate, and the fourth-layer top pressure plate are provided with several U-shaped pipe bays and solvent pipe bays on their sides, and several limiting thick steel plates are fixed circumferentially on their lower end faces.

[0018] The bottom pressure plate has only a few solvent tube bayonets on its side;

[0019] The second-layer top pressure plate, the third-layer top pressure plate, the fourth-layer top pressure plate, and the bottom top pressure plate are provided with top pressure plate solvent holes;

[0020] The slots, pipe openings, and limiting steel plates on each layer of the top pressure plate are all corresponding in position and orientation.

[0021] Furthermore, the U-shaped grouting pipe consists of a U-shaped pipe, a grout inlet, a grout outlet, and a grouting port with a one-way valve, and is fixed to the pull-out head;

[0022] The inlet pipe is connected to the grouting equipment via a grouting pipe, and the outlet pipe is connected to the outlet pipe, which can be plugged with a pipe plug.

[0023] Several grouting ports with one-way valves are provided on one side of the U-shaped pipe where it enters the grouting port. The grouting ports with one-way valves will only open for grouting under a certain grouting intensity.

[0024] The U-shaped grouting pipe is a rigid structure and can be fixed by inserting it into the U-shaped pipe insertion hole, or by clamping it onto the U-shaped pipe clamp and the upper end face of the top pressure plate;

[0025] The U-shaped grouting pipe has the function of multiple grouting. Specifically, it utilizes the working characteristic that the grouting port with a one-way valve will only open for grouting under a certain grouting intensity. This is achieved by blocking the grout outlet pipe during grouting, opening the grout outlet pipe when emptying the grout, and blocking the grout outlet pipe again when grouting.

[0026] Furthermore, the solvent pipeline consists of a main solvent pipe and a branch solvent pipe, and is fixed to the pull-out head;

[0027] The inlet of the solvent pipeline is connected to the solvent tank via a delivery pipeline;

[0028] The solvent main pipe is a rigid structure and can be fixed by inserting it into the solvent insertion hole or by locking it at the solvent tube bayonet; the solvent branch pipe is a flexible structure and can be fixed by connecting one end to the solvent main pipe and inserting the other end into the solvent hole of the rack.

[0029] Furthermore, the inflatable airbag consists of an upper airbag fixing sleeve, an airbag, and a lower airbag fixing sleeve;

[0030] The inflatable airbag is connected to the air pump via an air pipe with a two-way valve. The purpose of the two-way valve is twofold: firstly, it allows air to be inflated into the airbag, enabling the pull-out rack to be diagonally extended by the elastic rubber rope (one end of the elastic rubber rope is connected to the pull-out rack, and the other end is connected to the airbag); secondly, it prevents the airbag from deflating too quickly during grouting, i.e., grout is injected into the airbag while maintaining the diagonally extended state of the pull-out rack.

[0031] The upper airbag fixing sleeve is fixed on the top pressure plate and has a corresponding tube hole. The lower airbag fixing sleeve is fixed on the bottom pressure plate. The two work together to fix the airbag.

[0032] Furthermore, the injection equipment includes an air pump, grouting equipment, and a solvent tank;

[0033] The infusion pipe, the gas pipe with a two-way valve, the grouting pipe, and the grout outlet pipe connected to the injection device are constrained around the anchor bolt by pipe sleeves.

[0034] A method for installing a rack-and-pinion airbag enlarged head anchor bolt that can be repeatedly grouted and is recyclable, characterized by comprising the following steps:

[0035] Insert the grout inlet and outlet into the insertion hole of the U-shaped pipe, and clamp the U-shaped pipe into the U-shaped pipe clamp. The grouting port with one-way valve is clamped at the upper end face of the top pressure plate to fix the U-shaped grouting pipe.

[0036] The solvent main pipe is inserted into the solvent insertion hole and secured at the solvent pipe bayonet, while the solvent branch pipe is inserted into the solvent hole of the rack to fix the solvent pipeline.

[0037] Place the airbag on the pull-out head, and fix the upper airbag fixing sleeve and the lower airbag fixing sleeve on the top pressure plate and the bottom pressure plate respectively to fix the airbag.

[0038] Connect the infusion line to the solvent main line;

[0039] Insert the air tube with the two-way valve into the air tube insertion hole;

[0040] Connect the grout inlet to the grouting pipe and the grout outlet to the grout outlet pipe;

[0041] The anchor bolt is screwed into the screw sleeve, and the anchor bolt, the agent delivery pipe, the air pipe with the two-way valve, and the grouting pipe are fitted into the sleeve;

[0042] Connect the infusion pipeline to the solvent tank, connect the air pipe with the two-way valve to the air pump, and connect the grouting pipeline to the grouting equipment. Installation is complete.

[0043] A method for using a rack-and-pinion airbag enlarged head anchor bolt that can be repeatedly grouted and is recyclable, characterized by comprising the following steps:

[0044] Determine the location for drilling;

[0045] Drill to the designed depth, then enlarge the hole to obtain the pile hole;

[0046] Lower the rack and pinion airbag enlarged head anchor bolt to the design depth;

[0047] Turn on the air pump and inflate the air bag through the air hose with the two-way valve until it can no longer be inflated;

[0048] Open the grout outlet pipe, start the grouting equipment, and input grout into the U-shaped pipe through the grouting pipe. After the grout starts to flow out of the grout outlet pipe, reduce the grouting intensity.

[0049] Plug the grout outlet pipe with a pipe plug, then increase the grouting intensity and start injecting grout into the airbag and pile hole through the grouting port with a one-way valve until no more grout can be injected or the grout overflows from the pile hole. At this point, the grouting is complete.

[0050] After grouting is completed, remove the pipe plug and inject clean water into the grouting pipe to drain the grout from the U-shaped pipe and prevent the grout from hardening and clogging the pipe. After clean water is evenly discharged from the grout outlet pipe, it indicates that the grout has been cleaned up, and the pipe plug can be used to plug the grouting pipe and the grout outlet pipe.

[0051] After the rack airbag enlarged head anchor has been working for a long time, if it is necessary to repeat grouting of the anchor enlarged head and the pile hole, pull out the plugs of the grouting pipe and the grout outlet pipe, connect the grouting pipe to the grouting equipment, and repeat steps 5, 6 and 7.

[0052] When the rack and pinion airbag enlarged head anchor rod needs to be retrieved, open the solvent tank and inject solvent into the solvent main pipe and solvent branch pipe to dissolve the pull-out head. After a period of reaction, the anchor rod can be pulled out, thus eliminating the pull-out component and retrieving the anchor rod.

[0053] Compared with the prior art, the beneficial effects of the present invention are:

[0054] 1. This invention combines high pull-out resistance with corrosion protection. It screws a pull-out head with a top pressure plate and diagonally expandable pull-out resistance racks onto the anchor bolt. The pull-out resistance is achieved through multi-layered top pressure plates and multiple pull-out resistance racks, significantly improving the bond strength between the anchor bolt and the grout. Furthermore, the invention utilizes an inflatable airbag to diagonally open the pull-out resistance racks, providing corrosion protection for the expanded anchor head while ensuring the pull-out resistance racks function effectively.

[0055] 2. Multiple grouting operations can be performed on the same pipeline, saving time and effort. The U-shaped grouting pipeline designed in this invention consists of a grouting pipeline, a grout outlet pipeline, a U-shaped pipe, and a grouting port with a one-way valve. It can take advantage of the working characteristic that the grouting port with the one-way valve only opens to start grouting under a certain grouting intensity. By blocking the grout outlet pipeline for grouting and opening the grout outlet pipeline for grout cleaning, the purpose of multiple uses of the pipeline inside the enlarged head anchor rod can be achieved.

[0056] 3. The pull-out resistant components of the enlarged head anchor bolt are fully recyclable. The pull-out resistant heads in this invention are all made of high-strength soluble materials, and interconnected solvent channels are provided within the heads. When the enlarged head anchor bolt is to be withdrawn from operation, solvent can be injected into the solvent channels to melt the pull-out resistant head and recycle the anchor bolt, achieving complete recycling of the pull-out resistant components of the enlarged head anchor bolt. This avoids the formation of underground obstacles and facilitates the reuse of underground space. Attached Figure Description

[0057] Figure 1 Schematic diagram of rack and pinion airbag enlarged head anchor bolt operation

[0058] Figure 2 Front view of the anti-pull-out head structure

[0059] Figure 3 Top view of the anti-pull-out head structure

[0060] Figure 4 : Figure 2 AA section view

[0061] Figure 5 : Figure 2 BB section view

[0062] Figure 6 : Figure 2 CC section view

[0063] Figure 7 : Figure 3 DD section view

[0064] Figure 8 : Figure 7 Magnification Figure 1

[0065] Figure 9 : Figure 3 EE section view

[0066] Figure 10 : Figure 3 FF section view

[0067] Figure 11 Front view of U-shaped grouting pipe structure

[0068] Figure 12 Side view of U-shaped grouting pipe structure

[0069] Figure 13 Front view of completed installation of rack and pinion airbag enlarged head anchor bolt.

[0070] Figure 14 Top view of completed installation of rack and pinion airbag enlarged head anchor bolt.

[0071] Figure 15 : Figure 14 Cross-sectional view of the middle HH (without inflatable airbags)

[0072] Figure 16 : Figure 15 Medium magnification Figure 2

[0073] Figure 17 : Figure 14 Cross-sectional view of the middle HH (with inflatable airbags)

[0074] Figure 18 : Figure 14Cross-sectional view of GG (without inflatable airbags)

[0075] Figure 19 : Figure 14 Cross-sectional view of GG (with inflatable airbags)

[0076] In the diagram: 1. Top pressure plate; 2. Threaded sleeve; 3. Second-layer pressure plate; 4. Third-layer pressure plate; 5. Fourth-layer pressure plate; 6. Bottom pressure plate; 7. U-shaped tube bayonet; 8. Elastic rubber rope; 9. Solvent tube bayonet; 9-1. Solvent hole in the pressure plate; 10-1. 6-section long rack; 10-2. 5-section long rack; 10-3. 4-section long rack; 10-4. Rotating shaft; 10-5. Anti-pull-out tooth; 10-6. Rack tube; 10-7. Limiting thick steel plate; 10-8. Solvent hole in the rack; 11. Threaded hole; 12. U-shaped tube insert. 13. Manhole; 14. Solvent tube insertion hole; 15. Air tube insertion hole; 16. U-shaped tube; 17. Grout inlet; 18. Grout outlet; 19. Grouting port with one-way valve; 20. Upper airbag fixing sleeve; 21. Airbag; 22. Lower airbag fixing sleeve; 23. Solvent tube main pipe; 24. Solvent tube branch pipe; 25. Grouting pipe; 26. Pile hole; 27. Grout. Detailed Implementation

[0077] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0078] It should be noted that in the description of this invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0079] A rack-and-socket enlarged head anchor bolt capable of multiple grouting and recyclability consists of an anchor bolt 18, an anti-pull-out head, an integrated piping system, an inflatable airbag, and an injection device.

[0080] like Figures 2-10 The pull-out head consists of a top pressure plate, a screw-in sleeve 2, a pull-out rack, several pipe openings and bayonets, all made of high-strength soluble materials.

[0081] like Figure 2 , 7The top pressure plate, from top to bottom, includes a top pressure plate 1, a second-layer top pressure plate 3, a third-layer top pressure plate 4, a fourth-layer top pressure plate 5, and a bottom pressure plate 6. The diameter of the top pressure plate 1 and the lower diameter of the bottom pressure plate 6 are relatively smaller than the other pressure plates to facilitate the installation of the upper airbag fixing sleeve 16-1 and the lower airbag fixing sleeve 16-3. The threaded sleeve 2 has a threaded hole 11 inside, which can be used to screw the anchor rod 18 into the sleeve. The pull-out resistance rack includes 6 long racks 10-1, 5 long racks 10-2, and 4 long racks 10-3, with varying lengths from top to bottom. This design incorporates the load-bearing characteristic of the anchor rod being transferred from top to bottom during pull-out resistance, ensuring sufficient pull-out resistance while avoiding excessively long pull-out resistance heads.

[0082] like Figure 2 , 3 4, 5, 9, 10. The top pressure plate 1 is provided with several U-shaped tube insertion holes 12, solvent tube insertion holes 13, and gas tube insertion holes 14. The second-layer pressure plate 3, third-layer pressure plate 4, and fourth-layer pressure plate 5 are provided with several U-shaped tube bayonets 7 and solvent tube bayonets 9 on their sides, and several limiting thick steel plates 10-7 are fixed circumferentially on their lower end faces. The bottom pressure plate 6 is only provided with several solvent tube bayonets 9 on its side. The second-layer pressure plate 3, third-layer pressure plate 4, fourth-layer pressure plate 5, and bottom pressure plate 6 are provided with pressure plate solvent holes 9-1. The bayonets, tube openings, and limiting thick steel plates provided on each layer of pressure plate are corresponding in position and orientation.

[0083] like Figure 2 , 7 8. The pull-out resistance rack consists of pull-out resistance teeth 10-5, a rack tube 10-6, and a rack solvent hole 10-8. It is hinged to the limiting thick steel plate 10-7 via a rotating shaft 10-4, meaning the pull-out resistance rack can rotate around the rotating shaft 10-4. The opening of the rack solvent hole 10-8 is located on the pull-out resistance rack facing the threaded sleeve 2.

[0084] like Figures 11-19 The integrated pipeline system includes a U-shaped grouting pipe, a solvent pipe, a gas pipe 19 with a two-way valve, a grouting pipe 21, a grout outlet pipe 23, and a solvent delivery pipe 17-2. All of these, along with the inflatable airbag, are fixed to the pull-out head. Except for the grout outlet pipe 23, all of these are connected to the injection equipment. The system has the functions of inflating the enlarged head anchor bolt, performing multiple grouting, and inputting solvent into the pull-out head.

[0085] like Figure 11 , 1218, 19. The U-shaped grouting pipe consists of a U-shaped pipe 15, a grout inlet 15-1, a grout outlet 15-2, and a grouting port 15-3 with a one-way valve, and is fixed to the pull-out head. The inlet 15-1 is connected to the grouting equipment via a grouting pipe 21, and the outlet 15-2 is connected to a grouting outlet pipe 23, which can be plugged with a pipe plug 22. Several grouting ports 15-3 with one-way valves are provided on one side of the U-shaped pipe 15 where it enters the grout inlet 15-1; the grouting ports 15-3 with one-way valves will only open for grouting under a certain grouting intensity. The U-shaped grouting pipe is a rigid structure and can be fixed by inserting it into the U-shaped pipe insertion hole 12, or by clamping it onto the U-shaped pipe clamp 7 and the upper surface of the pressure plate. The U-shaped grouting pipe has the function of multiple grouting. Specifically, it utilizes the working characteristic of the grouting port 15-3 with one-way valve, which only opens the grouting port for grouting under a certain grouting intensity. This is achieved by blocking the grout outlet pipe 23 during grouting, opening the grout outlet pipe 23 when emptying the grout, and blocking the grout outlet pipe 23 when grouting again.

[0086] like Figure 15 , 16 17. The solvent pipeline consists of a main solvent pipe 17 and a branch solvent pipe 17-1, fixed to the pull-out head, with the pipe end connected to the solvent tank via a delivery pipeline 17-2. The main solvent pipe 17 is a rigid structure and can be fixed by inserting it into the solvent insertion hole 13 and locking it at the solvent pipe bayonet 9. The branch solvent pipe 17-1 is a flexible structure and can be fixed by connecting one end to the main solvent pipe 17 and inserting the other end into the rack solvent hole 10-8.

[0087] like Figure 1 , 13 17, 19. The inflatable airbag consists of an upper airbag fixing sleeve 16-1, an airbag 16-2, and a lower airbag fixing sleeve 16-3, and is connected to an air pump via an air pipe 19 with a two-way valve. The upper airbag fixing sleeve 16-1 is fixed to the top pressure plate 1 and has corresponding holes. The lower airbag fixing sleeve 16-3 is fixed to the bottom pressure plate 6. Both sleeves work together to secure the airbag 16-2.

[0088] like Figure 1 , 13 17, 19, the injection equipment includes an air pump, grouting equipment, and a solvent tank. The grout outlet pipe 23 and the agent delivery pipe 17-2 connected to the injection equipment, the air pipe 19 with a two-way valve, and the grouting pipe 21 are constrained around the anchor bolt 18 by a pipe sleeve 20.

[0089] A method for installing a rack-and-pinion airbag enlarged head anchor bolt that can be grouted multiple times and is recyclable includes the following steps:

[0090] Step 1: Insert the grout inlet 15-1 and grout outlet 15-2 into the U-shaped tube insertion hole 12, and secure the U-shaped tube 15 in the U-shaped tube clamp 7. Secure the U-shaped grouting pipe by securing the grouting port 15-3 with the one-way valve to the upper end face of the top pressure plate.

[0091] Step 2: Insert the solvent main pipe 17 through the solvent insertion hole 13 and lock it into the solvent pipe bayonet 9. Insert the port of the solvent branch pipe 17-1 into the rack solvent hole 10-8 to fix the solvent pipe.

[0092] Step 3: Place the airbag 16-2 on the pull-out head, and fix the upper airbag fixing sleeve 16-1 and the lower airbag fixing sleeve 16-3 on the top pressure plate 1 and the bottom pressure plate 6 respectively to fix the airbag 16-2.

[0093] Step 4: Connect the infusion pipeline 17-2 to the solvent main pipe 17;

[0094] Step 5: Insert the air tube 19 with the two-way valve into the air tube insertion hole 14;

[0095] Step 6: Connect the grout inlet 15-1 to the grouting pipe 21 and the grout outlet 15-2 to the grout outlet pipe 23;

[0096] Step 7: Screw the anchor rod 18 into the screw sleeve 2, and fit the anchor rod 18, the agent delivery pipe 17-2, the air pipe 19 with the two-way valve, and the grouting pipe 21 into the pipe sleeve 20;

[0097] Step 8: Connect the infusion pipe 17-2 to the solvent tank, connect the air pipe 19 with the two-way valve to the air pump, and connect the grouting pipe 21 to the grouting equipment. Installation is complete.

[0098] A method for using a rack-and-pinion airbag enlarged head anchor bolt that can be repeatedly grouted and is recyclable includes the following steps:

[0099] Step 1: Determine the location for drilling;

[0100] Step 2: Drill to the designed depth, then enlarge the hole to obtain pile hole 24;

[0101] Step 3: Lower the rack and pinion airbag enlarged head anchor bolt to the designed depth;

[0102] Step 4: Turn on the air pump and inflate the air bag 16-2 through the air tube 19 with the two-way valve until no more air can be added.

[0103] Step 5: Open the grout outlet pipe 23, start the grouting equipment, and input grout 25 into the U-shaped pipe 15 through the grouting pipe 21. After the grout 25 starts to flow out of the grout outlet pipe 23, reduce the grouting intensity.

[0104] Step 6: Block the grout outlet pipe 23 with pipe plug 22, then increase the grouting intensity and start grouting into the airbag 16-2 and pile hole 24 through the grouting port 15-3 with one-way valve until the grout 25 can no longer be injected or the grout 25 overflows from the pile hole 24. At this point, the grouting is completed.

[0105] Step 7: After grouting is completed, remove the pipe plug 22 and inject clean water into the grouting pipe 21 to drain the grout from the U-shaped pipe and prevent the grout from hardening and clogging the pipe. After the clean water is evenly discharged from the grout outlet pipe 23, it indicates that the grout has been cleaned up, and the pipe plug 22 can be used to plug the grouting pipe 21 and the grout outlet pipe 23.

[0106] Step 8: After the rack airbag enlarged head anchor bolt has been working for a long time, if it is necessary to repeat grouting of the anchor bolt enlarged head and the pile hole 24, pull out the plug 22 of the grouting pipe 21 and the grout outlet pipe 23, connect the grouting pipe 21 to the grouting equipment, and repeat steps 5, 6 and 7.

[0107] Step 9: When the rack airbag enlarged head anchor rod needs to be recovered, open the solvent box and inject solvent into the solvent main pipe 17 and solvent branch pipe 17-1 to dissolve the pull-out head. After a period of reaction, the anchor rod 18 can be pulled out to eliminate the pull-out component and recover the anchor rod.

[0108] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A regroutable and recyclable rack bushing expanded head anchor rod, characterized in that, The system includes an anchor bolt, a pull-out resistant head with a top pressure plate and pull-out resistant racks, an integrated piping system, an inflatable airbag, and an injection device. The pull-out resistant head is screwed to one end of the anchor bolt and consists of a top pressure plate, a screw-in sleeve, pull-out resistant racks, and several pipe openings and bayonets, all made of high-strength soluble material. The top pressure plate, from top to bottom, includes a top pressure plate, a second-layer pressure plate, a third-layer pressure plate, a fourth-layer pressure plate, and a bottom pressure plate. The pull-out resistant racks include, from top to bottom, 6-section long racks, 5-section long racks, and 4-section long racks of varying lengths. The rack, specifically the pull-out resistance rack, is hinged to a limiting thick steel plate fixed to the side of the top pressure plate via a rotating shaft, and the pull-out resistance rack is provided with a rack solvent hole; the integrated pipeline system includes a U-shaped grouting pipeline, a solvent pipeline, a gas pipe with a two-way valve, a grouting pipeline, a grout outlet pipeline, and a solvent delivery pipeline; the solvent pipeline consists of a rigid solvent main pipe and a flexible solvent branch pipe, the solvent main pipe is fixed to the pull-out resistance head, and one end of the solvent branch pipe is connected to the solvent main pipe, while the other end is inserted into the rack solvent hole; The inflatable airbag consists of an upper airbag fixing sleeve, an airbag, and a lower airbag fixing sleeve, and is fixed to the pull-out head; the pull-out rack is connected to the airbag via an elastic rubber rope, and the pull-out rack is obliquely opened outward around the rotation axis by the inflation of the airbag; the injection device includes an air pump, a grouting device, and a solvent tank; the air pipe with a two-way valve connects the air pump and the airbag, and is used to inflate the rack to open it and prevent excessive air exhaust during grouting; the infusion pipeline, the air pipe with a two-way valve, the grouting pipeline, and the grout outlet pipeline are constrained around the anchor rod by a pipe sleeve.

2. The re- groutable and recyclable rack bushing expansion head anchor rod according to claim 1, characterized in that, The arrangement of the pipe openings and clamps is as follows: the top pressure plate is provided with a U-shaped pipe insertion hole, a solvent pipe insertion hole, and a gas pipe insertion hole; the sides of the second, third, and fourth pressure plates are provided with U-shaped pipe clamps, solvent pipe clamps, and the limiting thick steel plates; the side of the bottom pressure plate is provided with a solvent pipe clamp; the second, third, fourth, and bottom pressure plates are provided with pressure plate solvent holes; the clamps, pipe openings, and limiting thick steel plates of each pressure plate are corresponding in position and orientation.

3. The re- groutable and recyclable rack bushing expansion head anchor rod according to claim 2, characterized in that, The U-shaped grouting pipe consists of a U-shaped pipe, a grout inlet, a grout outlet, and a grouting port with a one-way valve, and is fixed to the pull-out head. The grout inlet is connected to the grouting equipment through the grouting pipe, and the grout outlet is connected to the grout outlet pipe. Several grouting ports with one-way valves are provided on the side of the U-shaped pipe where it enters the grout inlet. The grouting ports with one-way valves are only opened when the preset grouting intensity is reached. Multiple grouting is achieved by blocking the grout outlet pipe during grouting and opening the grout outlet pipe when the grout is emptied.

4. A method of installing a regroutable and recyclable rack-and-pinion sock expansion head anchor rod as defined in claim 3, characterized in that, The process includes the following steps: First, fix the U-shaped grouting pipe and solvent pipe to the pull-out head through insertion holes and bayonets, respectively, and insert the solvent branch pipe into the solvent hole of the rack; second, install airbags on the pull-out head, fix them to the top and bottom pressure plates through upper and lower airbag fixing sleeves, and connect the elastic rubber rope to the pull-out rack; third, connect the delivery pipe to the main solvent pipe, insert the air pipe with a two-way valve into the air pipe insertion hole, connect the grouting pipe to the grout inlet, and connect the grout outlet pipe to the grout outlet; fourth, screw the anchor bolt into the screw sleeve, constrain each pipe around the anchor bolt with a sleeve, and connect it to the solvent box, air pump, and grouting equipment respectively.

5. A method of using the rack-and-pinion airbag enlarged head anchor bolt as described in claim 3, characterized in that, Includes the following steps: After drilling and enlarging the pile hole, the anchor rod is lowered to the designed depth. The air pump is started to inflate the airbag through the air pipe with a two-way valve, causing the pull-out rack to be obliquely spread under the compression of the airbag and the traction of the elastic rubber rope. The grout outlet pipe is opened, and the grouting equipment is started to fill the U-shaped pipe with grout. The grouting intensity is then reduced, and the grout outlet pipe is blocked and the grouting intensity is increased, so that the grout is injected into the airbag and the pile hole through the grouting port with a one-way valve until no more grout can be injected or the grout overflows from the pile hole. After grouting is completed, the grout outlet pipe is opened to inject clean water to drain the residual grout in the pipe. Then, the grouting pipe and the grout outlet pipe are sealed with a pipe plug. If grouting needs to be repeated after the anchor rod has been working for a long time, the pipe plugs of the grouting pipe and the grout outlet pipe are removed, the grouting pipe is connected to the grouting equipment, and the above grouting steps are repeated. When recovery is required, a solvent is injected through the solvent pipe to dissolve the pull-out head made of soluble material. Then, the anchor rod is pulled out, realizing the elimination of the pull-out component and the recovery of the anchor rod.

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