A composite pipe-slot anchoring device and its application method

Abstract

This invention discloses a composite slotted anchoring device and its application method. The device includes a slotted anchor rod and a tray plate at one end, as well as a grouting pipe and a rubber plug. The rubber plug is axially confined and built into the inner cavity of the slotted anchor rod. The grouting pipe is L-shaped, with its long arm installed through the rubber plug and its short arm extending outside the side wall of the slotted anchor rod. By placing the rubber plug inside the slotted anchor rod and installing the grouting pipe through the rubber plug, the radial pressure of the anchor rod during the driving of the anchor rod into the support hole deforms the rubber plug inside the anchor rod. This deformation effectively seals the water inflow within the support hole, solving the problem of controlling water inflow during anchoring support in large-water mines using existing technologies. It also increases the friction between the rod and the rock wall, enhancing the stability of the anchoring support. High-pressure grouting through the grouting pipe overcomes the limitation of traditional slotted anchor rods not being able to function as grouting pipes, but also solidifies the rod and the rock wall, further increasing the anchoring force and improving the support strength.

Description

Technical Field

[0001] This invention belongs to the field of mine roadway support and water control, specifically a composite pipe-slot anchoring device and its application method. Background Technology

[0002] Slotted bolts are an important component of mine roadway support, characterized by their simple structure, low cost, and strong anchoring force, and are widely used in this field. However, due to their structural characteristics, slotted bolts cannot be used as grouting pipes. During anchoring and support operations in flooded mines, large amounts of water gush out from inside the bolts and through the gaps in the bolt seams, making grouting difficult and ineffective. This results in significant mine water inrush, severely impacting construction and posing substantial safety risks. Summary of the Invention

[0003] The purpose of this invention is to provide a composite pipe-slot anchoring device with integrated grouting and water-blocking functions to overcome the above-mentioned defects in the prior art.

[0004] The composite pipe-slot anchoring device provided by the present invention includes a pipe-slot anchor rod and a tray plate at one end, as well as a grouting pipe and a rubber plug. The rubber plug is axially limited and built into the inner cavity of the pipe-slot anchor rod. The grouting pipe is L-shaped, with its long arm installed through the rubber plug and its short arm extending out of the side wall of the pipe-slot anchor rod.

[0005] In one embodiment of the above-mentioned device, the diameter of the pipe joint anchor rod is larger than the diameter of the support hole, and the rod body is provided with a grouting pipe installation hole corresponding to the tail of the pipe joint.

[0006] In one embodiment of the above-mentioned device, the inner wall of the pipe seam anchor rod is provided with multiple rows of weld points.

[0007] In one embodiment of the above-mentioned device, the grouting pipe is a seamless steel pipe, with a connecting thread at the outer end of its short arm and a matching threaded plug.

[0008] In one embodiment of the above-mentioned device, the length of the rubber plug is 1 / 3 to 1 / 2 of the length of the pipe joint anchor rod, and the tail is provided with a circular hole for installing the grouting pipe. In another embodiment of the above-mentioned device, the rubber plug includes an upper half and a lower half of equal length, and when the upper half and the lower half are fastened together, they form a circular hole for installing the long arm of the grouting pipe.

[0009] In one embodiment of the above-mentioned device, the upper body includes a thick-walled arcuate body and a thin-walled arcuate body extending from its outer wall, and the lower body is a thick-walled arcuate body.

[0010] In one embodiment of the above-mentioned device, limiting rings for restricting the axial movement of the rubber plug are respectively provided inside the pipe seam anchor rod at both ends corresponding to the rubber plug.

[0011] In one embodiment of the above device, the limiting ring is an elastic retaining ring or a hole retaining ring.

[0012] The method for anchoring and supporting large-scale mines using the above-mentioned anchoring device provided by the present invention includes the following steps:

[0013] (1) Drill anchor bolt support holes in the rock wall of the tunnel;

[0014] (2) Assemble the grouting pipe and the rubber plug, and then install the rubber plug into the inner cavity of the anchor bolt so that the grouting pipe extends out from the side wall of the anchor bolt;

[0015] (3) Fix limiting rings at both ends of the rubber plug in the inner cavity of the anchor bolt to restrict the axial movement of the rubber plug;

[0016] (4) Drive the anchor rod into the support hole, with the short arm of the grouting pipe located outside the tunnel wall;

[0017] (5) High-pressure grouting is performed through the grouting pipe;

[0018] (6) After grouting is completed, the short arm end of the grouting pipe is sealed.

[0019] This invention involves installing a rubber plug inside the slotted anchor rod and installing a grouting pipe through the rubber plug. During the anchor rod's insertion into the support hole, the radial pressure of the anchor rod deforms the rubber plug inside, effectively sealing off water inflow within the support hole. This not only solves the problem of controlling water inflow during anchoring support in flooded mines using existing technologies, but also increases the friction between the rod and the rock wall, enhancing the stability of the anchoring support. High-pressure grouting through the grouting pipe overcomes the limitation of traditional slotted anchor rods not being able to function as grouting pipes, but also solidifies the rod and rock wall, further increasing the anchoring force and improving the support strength. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall assembly of an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the pipe joint anchor rod in this embodiment.

[0022] Figure 3 This is an enlarged schematic diagram of the assembly of the rubber stopper and the grouting pipe in this embodiment.

[0023] Figure 4 This is a magnified cross-sectional view of the rubber stopper in this embodiment. Implementation

[0024] Combination Figures 1 to 4 As can be seen, the pipe-composite slotted anchoring device disclosed in this embodiment includes a rod 1, a grouting pipe 2, a rubber plug 3, a tray support plate 4, a limiting ring 5, and a welding point 6.

[0025] The diameter of the rod body 1 is slightly larger than the diameter of the support hole. An axial pipe joint 11 is provided on the side wall, and a tapered constriction is provided at the head. A grouting pipe installation hole is provided at the tail of the axial pipe joint.

[0026] One or more rows of welding points 6 are provided on the inner wall of the rod body 1, and the inner convex height of each welding point should be 3 to 5 mm.

[0027] Grouting pipe 2 is an L-shaped seamless steel pipe with connecting threads at the outer end of its short arm and a matching threaded plug (not shown in the figure).

[0028] The rubber stopper 3 includes an upper body 31 and a lower body 32. The upper body 31 includes a thick-walled arc-shaped body and a thin-walled arc-shaped body extending out of its outer wall. The lower body 32 is a thick-walled arc-shaped body. The two thick-walled arc-shaped bodies are fastened together to form a round hole for installing the long arm of the grouting pipe. The fastening surface is provided with a mounting hole for the short arm of the grouting pipe.

[0029] The split structure of the rubber stopper 3 facilitates the installation of the grouting pipe 2. Its upper half 31 extends out of the thin-walled arc-shaped body from the thick-walled arc-shaped body, which can increase the extrusion force generated by the entire rubber stopper when it is deformed under pressure.

[0030] The length of the rubber stopper 3 is approximately 1 / 3 to 1 / 2 of the length of the rod 1.

[0031] After the grouting pipe 2 and the rubber plug 3 are assembled, the rubber plug 3 is then installed in the inner cavity of the rod body 1. During installation, limiting rings 5 ​​are respectively set at both ends of the inner cavity of the rod body 1 corresponding to the rubber plug 3 to restrict the axial movement of the rubber plug.

[0032] In this embodiment, the limiting ring 5 is an elastic retaining ring or a hole spring, and is in a radial compression state during installation.

[0033] The specific steps for the anchoring and support operation of the above-mentioned device are as follows:

[0034] (1) Drill anchor bolt support holes in the rock wall of the tunnel according to the design requirements.

[0035] (2) Assemble the grouting pipe and the rubber plug, and then install the rubber plug in the inner cavity of the anchor rod so that the grouting pipe extends out from the installation hole on the side wall of the anchor rod.

[0036] (3) Fix limiting rings at both ends of the rubber plug in the inner cavity of the anchor rod to restrict the axial movement of the rubber plug.

[0037] (4) Use equipment such as anchor bolt trolley to drive the anchor bolt into the support hole, and the short arm of the grouting pipe is located outside the rock wall of the tunnel (which can reduce the impact on the grouting pipe during the driving of the bolt).

[0038] (5) High-pressure grouting is performed through the grouting pipe;

[0039] (6) After grouting is completed, the short arm end of the grouting pipe is sealed.

[0040] After the anchoring support work is completed, the anchoring device will apply radial pressure, friction, and the supporting force of the tray plate to the surrounding rock of the tunnel, thereby improving the support strength. Simultaneously, it can effectively reduce the water inflow generated by drilling the anchor bolt support hole, thus having a water-blocking function. The water-blocking principle is as follows: Since the diameter of the anchor bolt is slightly larger than the borehole diameter, during the process of driving the bolt into the support hole, the pipe joints on the side wall of the bolt are deformed and contracted under radial pressure, squeezing the rubber plug in the inner cavity of the bolt. After being deformed by compression, the rubber plug fully contacts the weld points on the inner wall of the bolt and is squeezed and filled into the inner cavity of the bolt and the gap between the lower end of the bolt and the rock wall, effectively reducing the borehole water inflow. In addition, the installation of grouting pipes can further enhance the anchoring support strength.

[0041] In summary, this composite device has the following advantages:

[0042] The rubber plug inside the rod body can effectively seal the water inflow in the support hole after being squeezed and deformed under radial pressure, and can also increase the friction between the rod body and the rock wall, thereby enhancing the stability of the anchor support.

[0043] It overcomes the shortcomings of traditional slotted anchor bolts that cannot be used as grouting pipes. High-pressure grouting through the grouting pipe can solidify the rod body and the rock wall, further increasing the anchoring force and improving the support strength.

Claims

1. A composite slotted pipe anchoring device, comprising a slotted pipe anchor rod and a tray plate at its tail end, characterized in that: The device also includes a grouting pipe and a rubber plug. The rubber plug is axially limited and built into the inner cavity of the pipe joint anchor. The grouting pipe is L-shaped, with its long arm installed through the rubber plug and its short arm extending out of the side wall of the pipe joint anchor. The grouting pipe is a seamless steel pipe, with a connecting thread at the outer end of its short arm and a matching threaded plug; The length of the rubber plug is 1 / 3 to 1 / 2 of the length of the pipe joint anchor rod, and includes an upper body and a lower body. The upper body includes a thick-walled arc-shaped body and a thin-walled arc-shaped body extending from its outer wall. The lower body is a thick-walled arc-shaped body. When the upper body and the lower body are fastened together, a circular hole is formed for installing the long arm of the grouting pipe. The pipe seam anchor rod is provided with limiting rings at both ends corresponding to the rubber plug to restrict the axial movement of the rubber plug.

2. The composite slotted pipe anchoring device as described in claim 1, characterized in that: The diameter of the pipe joint anchor rod is larger than the diameter of the support hole, and the rod body is provided with a grouting pipe installation hole at the tail of the pipe joint.

3. The composite pipe-slot anchoring device as described in claim 2, characterized in that: The inner wall of the pipe seam anchor rod is provided with one or more rows of weld points.

4. The composite slotted pipe anchoring device as described in claim 1, characterized in that: The limiting ring is an elastic retaining ring or a hole retaining ring.

5. A method for anchoring and supporting large-scale mines using the anchoring device described in any one of claims 1-4, comprising the following steps: (1) Drill anchor bolt support holes in the rock wall of the tunnel; (2) Assemble the grouting pipe and the rubber plug, and then install the rubber plug into the inner cavity of the anchor bolt so that the grouting pipe extends out from the side wall of the anchor bolt; (3) Fix limiting rings at both ends of the rubber plug in the inner cavity of the anchor bolt to restrict the axial movement of the rubber plug; (4) Drive the anchor rod into the support hole, with the short arm of the grouting pipe located outside the tunnel wall; (5) High-pressure grouting is performed through the grouting pipe; (6) After grouting is completed, the short arm end of the grouting pipe is sealed.

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