Grouting device with pressure self-sealing hole

Abstract

The utility model discloses a pressure self-sealing hole grouting device, which relates to the technical field of anchor rod grouting reinforcement and comprises a tray, an anchor rod, a bag hole packer and a grouting pipe. The tray is fixedly connected to the outer side face of the rock wall, the anchor rod and the grouting pipe penetrate through the tray and the rock wall to enter a drill hole, and the portions, located in the drill hole, of the anchor rod and the grouting pipe penetrate through the bag hole packer. A first pressure-bearing bursting hole communicated with an inner cavity of the bag hole packer is formed in the side wall of the part, penetrating through the bag hole packer, of the grouting pipe, and the end face, located in the drill hole, of the grouting pipe is closed and provided with a second pressure-bearing bursting hole. The grouting device has the advantages that the problem that grouting is difficult is solved, high grouting pressure can be adopted, and the grouting effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of anchor bolt grouting reinforcement technology, and in particular to a grouting device with pressurized self-sealing holes. Background Technology

[0002] Under the combined influence of high ground stress and intense mining, fissures easily develop in the surrounding rock of roadways located in unstable rock masses, leading to reduced rock strength, poor integrity, and instability, which makes controlling the surrounding rock of roadways difficult. For roadways made of broken and soft coal, anchor bolt grouting reinforcement technology is often used to improve the integrity and stability of the surrounding rock.

[0003] The anchor bolt grouting reinforcement technology involves injecting grout into the coal seam fissures through grouting pipes. Utilizing the filling, bonding, and solidification properties of the grout, it fills the fissures between broken and soft coal, bonding the broken and soft coal together to form a complete structure with high strength and high stability. At the same time, the support effect of the anchor bolts is used to control the stability of the surrounding rock in the broken and soft coal roadway.

[0004] Patent document CN109578033A discloses a coal mine roadway anchoring device, including an anchor rod, a rubber plug, and a grouting pipe. The anchor rod is fitted with a rubber plug as a sealing device, and the grouting pipe passes through the rubber plug to grout the gap between the anchor rod and the borehole. Existing anchor rod grouting reinforcement technology has the following problems: 1. Because the borehole diameter and anchor rod diameter must be properly matched, with a difference of 6mm to 10mm, the grouting pipe diameter is relatively small, making grouting difficult. 2. With a small grouting pipe diameter, the grouting pressure cannot be increased, resulting in the grout not filling the coal and rock fissures effectively, leading to poor grouting effect. 3. During grouting, the grout easily overflows from the grouting pipe and the gap between the anchor rod and the sealing device. 4. After grouting, the connection and matching between the sealing device, anchor rod, and grouting pipe are poor, resulting in poor sealing effect. Utility Model Content

[0005] The technical problem to be solved by this utility model is how to solve the grouting difficulties in anchor bolt grouting reinforcement technology and improve the grouting effect.

[0006] This utility model solves the above-mentioned technical problems through the following technical means: a pressurized self-sealing grouting device, including a tray, an anchor rod, a grouting bag sealer, and a grouting pipe; the tray is fixedly connected to the outer side of the rock wall, the anchor rod and the grouting pipe both pass through the tray and the rock wall to enter the borehole, and the portions of the anchor rod and the grouting pipe located in the borehole both pass through the grouting bag sealer; the side wall of the portion of the grouting pipe passing through the grouting bag sealer is provided with a first pressure-bearing burst hole communicating with the internal cavity of the grouting bag sealer, and the end face of the grouting pipe located in the borehole is closed and provided with a second pressure-bearing burst hole.

[0007] During grouting, grout flows from the outer end of the grouting pipe into the portion of the grouting pipe located inside the bag sealer. When the pressure inside the grouting pipe reaches the bursting pressure of the first pressure-bearing bursting hole, the first pressure-bearing bursting hole bursts first, and the grout flows into the cavity of the bag sealer. After the grout fills the cavity of the bag sealer, the bag sealer expands and seals the borehole. When the pressure inside the bag sealer reaches the bursting pressure of the second pressure-bearing bursting hole, the second pressure-bearing bursting hole bursts, and the grout flows into the borehole. Because this device uses a bag sealer that expands after grouting to seal the borehole, the designed borehole diameter can be much larger than that of the anchor bolt. Therefore, the designed diameter of the grouting pipe can be larger, solving the problem of difficult grouting. Due to the larger diameter of the grouting pipe, a higher grouting pressure can be used, improving the grouting effect.

[0008] As an optimized technical solution, the anchor rod passes through the middle position of the tray and the bladder sealing device, and two grouting pipes are provided, which pass through the tray and the bladder sealing device from both sides of the anchor rod respectively.

[0009] As an optimized technical solution, the pore-sealing device and the grouting pipe are integrated into one structure. This ensures that the pore diameters of the pore-sealing device and the grouting pipe are matched, preventing grout from overflowing during the grouting process; the connection between the pore-sealing device and the grouting pipe is well-matched, resulting in a good sealing effect.

[0010] As an optimized technical solution, the bag sealing device is a cylindrical structure with an anchor bolt installation hole and a grouting pipe hole passing through both ends. A cavity is formed between the outer wall of the cylindrical body, the inner wall of the anchor bolt installation hole, and the inner wall of the grouting pipe hole. The grouting pipe hole also serves as the part through which the grouting pipe passes through the bag sealing device. The part of the grouting pipe located outside both ends of the bag sealing device extends outward from the end of the grouting pipe hole.

[0011] As an optimized technical solution, the anchor bolt and the grout sealing device are connected by threads. This ensures that grout will not overflow from the gap between the anchor bolt and the grout sealing device during the grouting process; the grout sealing device and the anchor bolt have good matching performance, resulting in good sealing effect.

[0012] As an optimized technical solution, the length of the bag sealing device is less than the drilling depth.

[0013] The advantages of this utility model are:

[0014] 1. During the grouting process, grout flows from the outer end of the grouting pipe into the portion of the grouting pipe located inside the bag sealer. When the pressure inside the grouting pipe reaches the bursting pressure of the first pressure-bearing bursting hole, the first pressure-bearing bursting hole bursts first, and the grout flows into the cavity of the bag sealer. After the grout fills the cavity of the bag sealer, the bag sealer expands and seals the borehole. When the pressure inside the bag sealer reaches the bursting pressure of the second pressure-bearing bursting hole, the second pressure-bearing bursting hole bursts, and the grout flows into the borehole. Because this device uses a bag sealer that expands after grouting to seal the borehole, the designed borehole diameter can be much larger than that of the anchor bolt. Therefore, the designed diameter of the grouting pipe can be larger, solving the problem of difficult grouting. Due to the larger diameter of the grouting pipe, a higher grouting pressure can be used, improving the grouting effect.

[0015] 2. The grouting bag sealer and the grouting pipe are integrated into one structure, ensuring that the hole diameters of the grouting bag sealer and the grouting pipe are matched, and the grout will not overflow during the grouting process.

[0016] 3. The anchor bolt and the grouting bag sealer are connected by threads. This ensures that grout will not overflow from the gap between the anchor bolt and the grouting bag sealer during the grouting process.

[0017] 4. After grouting, because the bladder sealer is threadedly connected to the anchor bolt, and the bladder sealer and grouting pipe are an integral structure, the connection and matching are good, and the sealing effect is good. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the grouting device with pressurized self-sealing hole according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the bag sealing device according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 As shown in the figure, this utility model embodiment discloses a pressurized self-sealing grouting device, including a tray 1, an anchor bolt 2, a bag sealing device 3, and a grouting pipe 4.

[0022] The tray 1 is fixedly connected to the outer side of the rock wall 5. The anchor rod 2 and the grouting pipe 4 both pass through the tray 1 and the rock wall 5 into the borehole. The portions of the anchor rod 2 and the grouting pipe 4 inside the borehole both pass through the bag sealer 3. The anchor rod 2 passes through the middle of the tray 1 and the bag sealer 3. Two grouting pipes 4 are provided, each passing through the tray 1 and the bag sealer 3 from either side of the anchor rod 2. Multiple first-stage grouting pipes are provided on the sidewall of the portion of the grouting pipe 4 that passes through the bag sealer 3, connecting to the internal cavity of the bag sealer 3. The grouting pipe 4 is located inside the borehole, with its end face sealed and equipped with a second pressure-bearing burst hole. The burst pressure of the first pressure-bearing burst hole is less than that of the second pressure-bearing burst hole. To ensure that the borehole diameters of the bladder 3 and the grouting pipe 4 are matched and that the grout does not overflow during the grouting process, the bladder 3 and the grouting pipe 4 are designed as an integral structure. To ensure that the grout does not overflow from the gap between the anchor rod 2 and the bladder 3 during the grouting process, the anchor rod 2 and the bladder 3 are connected by threads.

[0023] The burst pressure of the first pressure-bearing burst hole is designed to be 5 MPa, and the burst pressure of the second pressure-bearing burst hole is designed to be 6 MPa. To ensure the grouting effect, the diameter of the borehole, the diameter of the anchor rod 2, and the diameter of the grouting pipe 4 must be matched. The designed borehole diameter is 80 mm, the diameter of the anchor rod 2 is 22 mm, the inner diameter of the grouting pipe 4 is 8 mm, and the outer diameter of the grouting pipe 4 is 12 mm. To ensure the support effect, for the 80 mm borehole, the designed borehole depth is no more than 800 mm, and the length of the bag sealer 3 is less than 800 mm.

[0024] like Figure 2 As shown, the bag sealing device 3 is a cylindrical structure with an anchor bolt mounting hole 31 and two grouting pipe holes 32 passing through both ends. A cavity is formed between the outer wall of the cylinder, the inner wall of the anchor bolt mounting hole 31 and the inner wall of the grouting pipe holes 32. The anchor bolt mounting hole 31 is provided with an internal thread. The grouting pipe holes 32 also serve as the part through which the grouting pipe 4 passes through the bag sealing device 3. The part of the grouting pipe 4 located outside both ends of the bag sealing device 3 extends outward from the end of the grouting pipe hole 32.

[0025] Working principle: During the grouting process, grout flows from the outer end of the grouting pipe 4 into the portion of the grouting pipe 4 located inside the bag sealer 3. When the pressure inside the grouting pipe 4 reaches 5MPa, the first pressure-bearing burst hole bursts first, and the grout flows into the cavity of the bag sealer 3. After the grout fills the cavity of the bag sealer 3, the bag sealer 3 expands and seals the borehole. When the pressure inside the bag sealer 3 reaches 6MPa, the second pressure-bearing burst hole bursts, and the grout flows into the borehole. Because this device uses a bag sealer 3 that expands after grouting to seal the borehole, the designed borehole diameter can be much larger than that of the anchor rod 2. Therefore, the designed diameter of the grouting pipe 4 can be larger, solving the problem of difficult grouting. Due to the larger diameter of the grouting pipe, a higher grouting pressure can be used, improving the grouting effect. After grouting, because the bag sealer 3 has good matching with the anchor rod 2 and the grouting pipe 4, the sealing effect is good.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressurized self-sealing grouting device, comprising an anchor bolt, a bladder sealer, and a grouting pipe; wherein the portions of the anchor bolt and the grouting pipe located within the borehole both pass through the bladder sealer; a first pressure-bearing burst hole communicating with the internal cavity of the bladder sealer is provided on the side wall of the portion of the grouting pipe passing through the bladder sealer, and a second pressure-bearing burst hole is provided on the portion of the grouting pipe located within the borehole, characterized in that: It also includes a tray, which is fixedly connected to the outer side of the rock wall. The anchor rod and the grouting pipe both pass through the tray and the rock wall to enter the borehole. There is one bladder sealer and two grouting pipes. The end face of the grouting pipe located in the borehole is closed. The bladder sealer and the grouting pipe are an integral structure. The anchor rod and the bladder sealer are connected by threads.

2. The grouting device for pressurized self-sealing holes according to claim 1, characterized in that: The anchor rod passes through the middle of the tray and the bladder sealer, and two grouting pipes pass through the tray and the bladder sealer from both sides of the anchor rod.

3. The grouting device for pressurized self-sealing holes according to claim 1, characterized in that: The bag sealing device is a cylindrical structure with an anchor bolt installation hole and a grouting pipe hole passing through both ends. A cavity is formed between the outer wall of the cylinder, the inner wall of the anchor bolt installation hole, and the inner wall of the grouting pipe hole. The grouting pipe hole also serves as the part through which the grouting pipe passes through the bag sealing device. The part of the grouting pipe located outside both ends of the bag sealing device extends outward from the end of the grouting pipe hole.

4. The grouting device for pressurized self-sealing holes according to claim 1, characterized in that: The length of the bag sealing device is less than the drilling depth.

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