One-step resin coil prestressed hollow bolt and its using method

Abstract

The present invention discloses a one-step resin cartridge prestressed hollow anchor rod, which includes a hollow anchor rod body, a resin cartridge, a crushing blade, a pressure generator for outputting instantaneous high pressure into the hollow anchor rod body, and a conveying device for outputting pressure liquid into the hollow anchor rod body; the present invention also discloses a usage method of the one-step resin cartridge prestressed hollow anchor rod, which includes steps such as installing the hollow anchor rod body, resin anchoring, grouting preparation, and mortar anchoring. In the present invention, the resin cartridge is arranged inside the anchor rod. When the resin is sent into the anchor hole, it only needs to insert the anchor rod into the anchor hole and then push the resin out to the anchor hole through the pressure liquid. During the process of sending the resin into the anchor hole, the friction between the resin cartridge and the inner wall of the anchor rod is small, and the anchor rod has a guiding effect on the resin. Therefore, it is easier to send the resin into the anchor hole; at the same time, the resin anchoring and mortar anchoring of the anchor rod are integrated, and the resin anchoring process and the grouting process do not interfere with each other, effectively ensuring the anchoring effect while reducing the anchoring cost.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt support, and particularly relates to a one-step resin cartridge prestressed hollow bolt and a using method thereof. Background Art

[0002] At present, in the fields of geotechnical engineering, mines, and tunnels, bolt support is usually adopted, and common bolts include resin bolts and mortar bolts, etc. In the mine roadway support system, resin bolts have the characteristics of short setting time and fast stress application, but the cost of resin materials is very high.

[0003] The construction process of resin bolts is as follows: (1) drilling an anchor hole, (2) feeding a resin cartridge into the anchor hole, (3) inserting a bolt, and (4) rotating the bolt to crush the resin cartridge so that the resin cartridge is mixed and solidified to anchor the bolt. In the second step, the resin cartridge is usually fed into the bottom of the anchor hole directly by high-pressure water or high-pressure gas. However, during the use process, due to factors such as the axis of the anchor hole not being a standard straight line (i.e., the hole is not straight), large friction between the resin cartridge and the anchor hole, and the resin cartridge itself being soft and having poor directivity, it is very difficult to feed the resin cartridge in place.

[0004] At the same time, the usage base of bolts is large. If the resin cartridge is used for full-length anchoring of each bolt, the cost is too high. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a one-step resin cartridge prestressed hollow bolt and a using method thereof. The resin cartridge is arranged inside the bolt. When the resin is fed into the anchor hole, it only needs to insert the bolt into the anchor hole and then push the resin out to the anchor hole through pressure liquid. During the process of feeding the resin into the anchor hole, the friction between the resin cartridge and the inner wall of the bolt is small, and the bolt has a guiding effect on the resin. Therefore, it is easier to feed the resin into the anchor hole. At the same time, the resin anchoring and mortar anchoring of the bolt are integrated, and the resin anchoring process and the grouting process do not interfere with each other, effectively ensuring the anchoring effect while reducing the anchoring cost.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A one-step resin cartridge prestressed hollow bolt, comprising a hollow bolt body, a resin cartridge, a crushing blade, a pressure generator for outputting instantaneous high pressure into the hollow bolt body, and a conveying device for outputting pressure liquid into the hollow bolt body;

[0008] The resin cartridge and the crushing blade are both arranged inside the hollow bolt body. The resin cartridge is arranged on one side of the crushing blade away from the end of the hollow bolt body. The pressure generator is communicated with the inside of the hollow bolt body;

[0009] At least one grout outlet hole communicating with the inside of the hollow anchor rod body is provided on the hollow anchor rod body, and a sealing plug adapted thereto is provided for the grout outlet hole.

[0010] Furthermore, the hollow anchor rod body is a hollow self-drilling anchor rod, a mechanical expansion shell anchor rod or a common hollow anchor rod.

[0011] Furthermore, the pressure generator is an air cannon.

[0012] Furthermore, the hollow anchor rod body includes a first anchoring section and a second anchoring section, the first anchoring section and the second anchoring section are connected by a grouting connector, and the grout outlet hole is provided on the grouting connector.

[0013] Furthermore, a resin mixer is provided between the crushing blade and the end of the hollow anchor rod body.

[0014] Furthermore, a pushing piston is provided at one end of the resin cartridge away from the end of the hollow anchor rod body.

[0015] A method for using a one-step resin cartridge prestressed hollow anchor rod includes the following steps:

[0016] S10. Install the hollow anchor rod body: Place the hollow anchor rod body in the anchor hole to prepare for resin anchoring;

[0017] S20. Resin anchoring: Grout into the inside of the hollow anchor rod body, and the grout pushes the resin cartridge towards the end of the hollow anchor rod body. During the movement, the resin cartridge is broken by the crushing blade and then sent into the anchor hole; after the resin cartridge is sent into the anchor hole, stir the hollow anchor rod body to make the resin anchoring agent mix fully, and wait for a time t1 until the resin anchoring agent solidifies;

[0018] S30. Grouting preparation: Output an instantaneous high pressure into the inside of the hollow anchor rod body through the pressure generator, and the instantaneous high pressure causes the sealing plug to disengage from the grout outlet hole;

[0019] S40. Mortar anchoring: Inject mortar into the inside of the hollow anchor rod body, and the mortar enters the anchor hole through the grout outlet hole.

[0020] Furthermore, the step S10 includes the following steps:

[0021] S101. Self-drilling installation: The hollow anchor rod body drills the anchor hole through the drill bit at the end. When the drill bit reaches the position, the hollow anchor rod body reaches the position; wherein, the hollow anchor rod body is a hollow self-drilling anchor rod.

[0022] Furthermore, the step S10 includes the following steps:

[0023] S102. Inserting the anchor rod: Drilling an anchor hole with a drilling tool, and withdrawing the drilling tool after the anchor hole is drilled; inserting the hollow anchor rod body into the anchor hole until the hollow anchor rod body is in place; wherein, the hollow anchor rod body is a mechanical expansion shell type anchor rod or a common hollow anchor rod.

[0024] Further, the step S20 further includes the following steps:

[0025] S201. Resin mixing: The resin cartridge is broken by a crushing blade, mixed by a resin mixer, and then sent into the anchor hole.

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

[0027] In the present invention, the resin cartridge is arranged inside the anchor rod. When the resin is sent into the anchor hole, it only needs to insert the anchor rod into the anchor hole and then push the resin out to the anchor hole through the pressure liquid. The friction between the resin cartridge and the inner wall of the anchor rod is small during the process of sending the resin into the anchor hole, and the anchor rod has a guiding effect on the resin. Therefore, it is easier to send the resin into the anchor hole; at the same time, the resin anchoring and mortar anchoring of the anchor rod are integrated, and the resin anchoring process and the grouting process do not interfere with each other, effectively ensuring the anchoring effect while reducing the anchoring cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of the one-step resin cartridge prestressed hollow anchor rod in the embodiment of the present invention;

[0029] Figure 2 is a cross-sectional view of the one-step resin cartridge prestressed hollow anchor rod in the embodiment of the present invention;

[0030] Figure 3 is Figure 2 an enlarged schematic view of the partial area A in

[0031] In the figure, 1. Hollow anchor rod body; 2. Resin cartridge; 3. Crushing blade; 4. Pressure generator; 5. Conveying device; 6. Slurry outlet hole; 7. Sealing plug; 8. Grouting hole; 9. First anchoring section; 10. Second anchoring section; 11. Grouting connector; 12. Resin mixer; 13. Pushing piston. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] Refer to Figures 1 - 3 , the present invention provides a technical solution:

[0034] Embodiment 1:

[0035] As shown Figures 1 - 3 in the figure, the one-step resin cartridge prestressed hollow anchor rod includes a hollow anchor rod body 1, a resin cartridge 2, a crushing blade 3, a pressure generator 4 for outputting instantaneous high pressure into the hollow anchor rod body 1, and a conveying device 5 for outputting pressure liquid into the hollow anchor rod body 1;

[0036] Both the resin cartridge 2 and the crushing blade 3 are arranged inside the hollow anchor rod body 1. The resin cartridge 2 is arranged on one side of the crushing blade 3 away from the end of the hollow anchor rod body 1. The pressure generator 4 and the conveying device 5 are respectively communicated with the inside of the hollow anchor rod body 1;

[0037] At least one slurry outlet hole 6 communicating with the inside of the hollow anchor rod body 1 is provided on the hollow anchor rod body 1, and a sealing plug 7 adapted thereto is provided on the slurry outlet hole 6.

[0038] The pressure generator 4 is an air cannon. Applying the instantaneous high pressure generated by the air cannon to the anchor rod anchoring is the first case in this field and has pioneering significance.

[0039] As Figure 2 shown in the figure, the pressure generator 4 is connected to the hollow anchor rod body 1 through a tee joint, and the other interface of the tee joint is connected to the conveying device 5. The conveying device 5 can be but is not limited to a grouting device, and it can also be a high-pressure water output device (pushing the resin cartridge 2 to move through high-pressure water).

[0040] Working principle: After installing the hollow anchor rod body 1 into the anchor rod hole, resin anchoring is started. The resin anchoring process is as follows: Start the conveying device 5 to convey pressure liquid into the hollow anchor rod body 1. The input pressure liquid pushes the resin cartridge 2 to move towards the end of the hollow anchor rod body 1. During the movement of the resin cartridge 2, the outer skin of the resin cartridge 2 is broken by the crushing blade 3, and the resin inside the resin cartridge 2 enters the anchor hole through the grouting hole 8 at the end of the anchor rod along with the extrusion. The resin entering the anchor hole solidifies in 8 - 180 s (the gel time is determined by the resin type. For example, the gel time of the ultra-fast type resin is 8 - 40 s, the gel time of the fast type resin is 41 - 90 s, and the gel time of the medium-speed type resin is 91 - 180 s). Then, a resin anchoring section L1 is formed at the front end of the hollow anchor rod body 1, and the resin anchoring section L1 serves as a temporary support.

[0041] After the resin solidifies, instantaneous high-pressure gas is output into the hollow anchor rod body 1 through an air cannon. Since the grouting hole 8 at the end of the hollow anchor rod body 1 is sealed by the solidified resin, the instantaneous high-pressure gas acts on the sealing plug 7, overcoming the static friction between the sealing plug 7 and the slurry outlet hole 6, and then pushing out the sealing plug 7, and making the sealing plug 7 fall into the anchor hole without affecting subsequent grouting. After the slurry outlet hole 6 is opened, slurry is injected into the hollow anchor rod body 1 through a grouting device. The slurry enters the anchor hole through the slurry outlet hole 6, and then permanently anchors the remaining length of the hollow anchor rod body 1. After the slurry solidifies, a mortar anchoring section L2 is formed. The water-cement ratio of the slurry is 0.35-0.4.

[0042] In the present invention, the resin cartridge 2 is arranged inside the anchor rod. When the resin is sent into the anchor hole, it only needs to insert the anchor rod into the anchor hole and then push the resin out into the anchor hole through pressurized liquid. During the process of sending the resin into the anchor hole, the friction between the resin cartridge 2 and the inner wall of the anchor rod is small, and the anchor rod has a guiding effect on the resin. Therefore, it is easier to send the resin into the anchor hole. At the same time, the resin anchoring and mortar anchoring of the anchor rod are integrated, and the resin anchoring process and the grouting process do not interfere with each other, effectively ensuring the anchoring effect while reducing the anchoring cost.

[0043] Further, the hollow anchor rod body 1 is a hollow self-drilling anchor rod, a mechanical expansion shell type anchor rod or a common hollow anchor rod. The hollow self-drilling anchor rod means that a drill bit is provided at the end of the anchor rod. The mechanical expansion shell type anchor rod or the common hollow anchor rod means that an anchor head is provided at the end of the anchor rod. The front end of the aforementioned hollow anchor rod body 1 refers to the end of the hollow anchor rod body 1 where the drill bit or the anchor head is provided. Among them, a grouting hole is provided on the drill bit or the anchor head, and the setting and specific structure of the grouting hole are common knowledge in the art.

[0044] When the hollow anchor rod body 1 is a hollow self-drilling anchor rod: the installation of the hollow anchor rod body 1 and the anchor hole is realized through the self-drilling of the anchor rod, and the subsequent operations after installation are as described above. When the hollow anchor rod body 1 is drilling, due to the setting of the sealing plug 7, low-pressure cooling water (due to the small pressure, it is not enough to push the resin cartridge 2 to be broken by the cutting blade 3) can still enter the drill bit from the inside of the hollow anchor rod body 1 to cool and lubricate the drill bit.

[0045] When the hollow anchor rod body 1 is a mechanical expansion shell type anchor rod or a common hollow anchor rod: first, drill an anchor hole through a drilling tool. After taking out the drilling tool, insert the hollow anchor rod body 1 into the anchor hole to complete the installation, and the subsequent operations after installation are as described above.

[0046] Further, as Figure 2 and Figure 3 shown, the hollow anchor rod body 1 includes a first anchor connection section 9 and a second anchor connection section 10. The first anchor connection section 9 and the second anchor connection section 10 are connected by a grouting connector 11, and the slurry outlet hole 6 is provided on the grouting connector 11.

[0047] Among them, the outer diameter of the first anchoring section 9 is larger than that of the second anchoring section 10, and the first anchoring section 9 is arranged near the end of the hollow anchor rod body 1; the grouting connector 11 is of a cylindrical sleeve structure. The first anchoring section 9 is sleeved outside the left end of the grouting connector 11, and the right end of the grouting connector 11 is sleeved outside the second anchoring section 10. The grouting connector 11 can be, but is not limited to, threadedly connected to the first anchoring section 9 and the second anchoring section 10.

[0048] The hollow anchor rod body 1 is arranged in a multi-section connection structure, which can ensure that the length of the hollow anchor rod body 1 meets the requirements of different anchoring lengths. Secondly, the size of the resin anchoring section, that is, the first anchoring section 9, is larger than that of the mortar anchoring section and the second anchoring section 10. Such a setting can reduce the amount of resin used in the resin anchoring section and reduce costs; at the same time, increase the amount of slurry used in the mortar anchoring section and improve the anchoring effect of the permanent support of the mortar anchoring section.

[0049] Furthermore, as Figure 2 shown, a resin mixer 12 is provided between the crushing blade 3 and the end of the hollow anchor rod body 1. The provided resin mixer 12 can make the resin flowing out of the resin cartridge 2 be fully mixed and then enter the anchor hole, thereby improving the anchoring effect of the resin anchoring section.

[0050] Furthermore, as Figure 3 shown, a push piston 13 is provided at one end of the resin cartridge 2 away from the end of the hollow anchor rod body 1. The provided push piston 13 is used to push the resin cartridge 2 forward under the action of slurry or high-pressure water, avoiding the high-pressure liquid directly squeezing the resin cartridge 2, resulting in the resin cartridge 2 being broken, and the high-pressure liquid being mixed with the resin cartridge 2, reducing the anchoring effect of the resin.

[0051] Embodiment 2:

[0052] A method for using a one-step resin cartridge 2 prestressed hollow anchor rod includes the following steps:

[0053] S10. Install the hollow anchor rod body 1: Place the hollow anchor rod body 1 in the anchor hole to prepare for resin anchoring;

[0054] S101. Self-drilling installation: The hollow anchor rod body 1 drills the anchor hole through the drill bit at the end. When the drill bit reaches the position, the hollow anchor rod body 1 reaches the position; among them, the hollow anchor rod body 1 is a hollow self-drilling anchor rod.

[0055] S20. Resin anchoring: Grout into the hollow anchor rod body 1. The slurry pushes the resin cartridge 2 towards the end of the hollow anchor rod body 1. During the movement, the resin cartridge 2 is broken by the crushing blade 3, and after being mixed by the resin mixer 12, it is sent into the anchor hole; after the resin cartridge is sent into the anchor hole, stir the hollow anchor rod body to make the resin anchoring agent fully mixed, and wait for a time t1 until the resin anchoring agent solidifies; where the specific time t1 is determined according to the requirements of the resin anchoring agent, specifically as described above.

[0056] S30. Grouting preparation: Output instantaneous high pressure into the interior of the hollow anchor rod body 1 through the pressure generator 4, and the instantaneous high pressure causes the sealing plug 7 to disengage from the slurry outlet hole 6;

[0057] S40. Mortar anchoring: Inject mortar into the interior of the hollow anchor rod body 1, and the mortar enters the anchor hole from the slurry outlet hole 6.

[0058] Embodiment 3:

[0059] The difference between this embodiment and Embodiment 2 lies in a method for using a one-step resin cartridge 2 prestressed hollow anchor rod, which includes the following steps:

[0060] S10. Install the hollow anchor rod body 1: Position the hollow anchor rod body 1 in the anchor hole to prepare for resin anchoring;

[0061] S102. Rod insertion and installation: Drill the anchor hole through the drill tool, and the drill tool withdraws after drilling the anchor hole; Insert the hollow anchor rod body 1 into the anchor hole until the hollow anchor rod body 1 is in place; wherein, the hollow anchor rod body 1 is a mechanical expansion shell type anchor rod or a common hollow anchor rod.

[0062] S20. Resin anchoring: Inject grout into the interior of the hollow anchor rod body 1, and the slurry pushes the resin cartridge 2 towards the end of the hollow anchor rod body 1. During the movement process, the resin cartridge 2 is broken by the crushing blade 3, and after being mixed by the resin mixer 12, it is sent into the anchor hole; After the resin cartridge is sent into the anchor hole, stir the hollow anchor rod body to make the resin anchoring agent mix fully, and wait for a time t1 until the resin anchoring agent solidifies; The specific time of t1 is determined according to the requirements of the resin anchoring agent, specifically as described above.

[0063] S30. Grouting preparation: Output instantaneous high pressure into the interior of the hollow anchor rod body 1 through the pressure generator 4, and the instantaneous high pressure causes the sealing plug 7 to disengage from the slurry outlet hole 6;

[0064] S40. Mortar anchoring: Inject mortar into the interior of the hollow anchor rod body 1, and the mortar enters the anchor hole from the slurry outlet hole 6.

[0065] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. One-step resin coil prestressed hollow anchor rod, characterized in that: It includes a hollow anchor body, a resin roll, a crushing blade, a pressure generator for outputting instantaneous high pressure into the hollow anchor body, and a conveying device for outputting pressure liquid into the hollow anchor body. The input pressure liquid pushes the resin roll to move toward the end of the hollow anchor body and enters the anchor hole through the grouting hole at the end of the anchor to solidify. The resin roll and the crushing blade are both arranged inside the hollow anchor body, the resin roll is arranged on a side of the crushing blade away from the end of the hollow anchor body, and the pressure generator is communicated with the interior of the hollow anchor body; The hollow anchor body is provided with at least one slurry outlet hole which is in communication with the interior of the hollow anchor body, and the slurry outlet hole is provided with a sealing plug adapted thereto; After the resin solidifies, the pressure generator outputs instantaneous high-pressure gas into the hollow anchor body to open the slurry outlet hole, and grouting is injected into the anchor hole through the slurry outlet hole.

2. The one-step resin coil prestressed hollow anchor bolt according to claim 1, characterized in that: The hollow anchor rod body is a hollow self-drilling anchor rod, a mechanical shell expansion anchor rod or a common hollow anchor rod.

3. The one-step resin coil prestressed hollow anchor bolt according to claim 1, characterized in that: The pressure generator is an air cannon.

4. The one-step resin coil prestressed hollow anchor rod according to claim 1, wherein: The hollow anchor body comprises a first anchoring section and a second anchoring section, the first anchoring section and the second anchoring section are connected via a grouting connector, and the grouting hole is arranged on the grouting connector.

5. The one-step resin coil prestressed hollow anchor rod according to claim 1, characterized in that: A resin mixer is provided between the crushing blade and the end of the hollow anchor rod body.

6. The one-step resin-rolled prestressed hollow anchor bolt according to claim 1, wherein: A pushing piston is arranged at one end of the resin roll away from the end of the hollow anchor rod body.

7. A method for using the one-step resin coil prestressed hollow anchor rod according to any one of claims 1-6, characterized in that: The steps include: S10, installing the hollow anchor body: placing the hollow anchor body in the anchor hole to prepare for resin anchoring; S20, resin anchoring: grouting is performed inside the hollow anchor body, and the grout pushes the resin roll toward the end of the hollow anchor body. During the movement, the resin roll is broken by the breaking blade and then sent into the anchor hole; after the resin roll is sent into the anchor hole, the hollow anchor body is stirred to mix the resin anchor agent fully, and wait for t1 time for the resin anchor agent to solidify; S30, grouting preparation: output instantaneous high pressure to the inside of the hollow anchor body through the pressure generator, and the instantaneous high pressure causes the sealing plug to separate from the grout outlet hole; S40, mortar anchoring: inject mortar into the hollow anchor body, and the mortar enters the anchor hole from the mortar outlet hole.

8. The method for using the one-step resin coil prestressed hollow anchor rod according to claim 7, characterized in that: The step S10 comprises the following steps: S101. Self-drilling installation: The hollow anchor rod body is provided with an anchor hole drilled by a drill bit at the end thereof. When the drill bit is in place, the hollow anchor rod body is in place; wherein the hollow anchor rod body is a hollow self-drilling anchor rod.

9. The method for using the one-step resin coil prestressed hollow bolt according to claim 7, characterized in that: The step S10 comprises the following steps: S102, rod insertion installation: drill an anchor hole with a drill, and withdraw the drill after drilling the anchor hole; insert the hollow anchor rod body into the anchor hole until the hollow anchor rod body is in place; wherein the hollow anchor rod body is a mechanical expansion shell anchor rod or a common hollow anchor rod.

10. The usage method of the one-step resin coil prestressed hollow anchor rod according to claim 7, characterized in that: The step S20 also includes the following steps: S201, resin mixing: the resin roll is crushed by the crushing blade, mixed by the resin mixer and then sent to the anchor hole.

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