High-pressure grouting device suitable for common anchor cable

Abstract

The high-pressure grouting device comprises a grouting pump, a grouting pipeline assembly and an anchoring hole sealing assembly coaxially installed on the common anchor cable, a grouting hole is formed in the anchoring hole sealing assembly, the outlet end of the grouting pipeline assembly is arranged in the grouting hole in a penetrating mode, and an outlet of the grouting pump is connected with the inlet end of the grouting pipeline assembly. The anchor cable combines the advantages of a common anchor cable and a grouting anchor cable, and can effectively solve the problems caused by anchoring of roadways with different surrounding rock characteristics. The safety coefficient of the surrounding rock of the roadway is enhanced, the influence of deformation and instability of the surrounding rock of the roadway on normal production of a coal mine is effectively reduced, and the life safety of underground operating personnel is guaranteed. Meanwhile, the cost of roadway surrounding rock support is greatly reduced, and the economic benefits of mine enterprises are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine pressure and rock layer control, and particularly relates to a high-pressure grouting device suitable for ordinary anchor cables. Background Art

[0002] Coal mining in my country is primarily underground, requiring the excavation of numerous underground tunnels. Maintaining unobstructed tunnels and stable surrounding rock is crucial for coal mine construction and production. With increasing mining depths and intensities, tunnel depths are increasing year by year, leading to increasingly complex geological conditions. The increasing prevalence of complex and difficult conditions, such as tunnels with high ground stress, those affected by intense mining, those with soft and fractured surrounding rock, and those with extremely large cross-sections and chambers, significantly increases the difficulty of tunnel support. Coal mine tunnel support has evolved through a long process, from timber support, masonry support, steel support, to anchor bolts and cable anchors. Years of practical experience both domestically and internationally demonstrate that cable anchor support is an economical and effective support technology. Compared with scaffolding support, cable anchor support significantly improves tunnel support effectiveness, reduces support costs, and reduces worker workload. More importantly, cable anchor support greatly simplifies the end support and advance support processes for coal mining faces, ensuring safe production and creating favorable conditions for rapid advancement of coal mining faces and substantial increases in coal production.

[0003] Anchor cables are mainly divided into grouting anchor cables and ordinary anchor cables. Ordinary anchor cables and grouting anchor cables are two commonly used support methods for tunnel support, each with its own unique advantages and disadvantages. Ordinary anchor cables are generally considered to be an economical and practical choice because of their relatively simple construction process and low technical requirements. However, the applicability of ordinary anchor cables may be low and cannot meet the poor tunnel surrounding rock support conditions. At the same time, the performance of ordinary anchor cables may be affected by the surrounding environment, such as humidity, temperature, etc., resulting in a decrease in the anchor cable support performance. Grouting anchor cables perform better in tunnel surrounding rocks with poor support. However, its construction process is relatively complicated, requiring professional technology and equipment, and the construction cost is relatively high. At the same time, due to the special structural characteristics of grouting anchor cables, their own strength is not as good as that of ordinary anchor cables. Based on this premise, in order to better combine the advantages and disadvantages of the above two anchor cables, the utility model has developed a high-pressure grouting device suitable for ordinary anchor cables. Utility Model Content

[0004] In order to solve the above technical problems existing in the prior art, the utility model provides a high-pressure grouting device suitable for ordinary anchor cables, which has a wide range of applications, is easy to operate, has high anchoring strength, and is highly safe and reliable.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solution: a high-pressure grouting device suitable for ordinary anchor cables, including a grouting pump, a grouting pipeline assembly and an anchor sealing assembly coaxially installed on the ordinary anchor cable, a grouting hole is provided on the anchor sealing assembly, the outlet end of the grouting pipeline assembly is passed through the grouting hole, and the outlet of the grouting pump is connected to the inlet end of the grouting pipe assembly.

[0006] The anchoring and sealing assembly includes a slurry stop plug, a sealing gasket, a tray and an anchor which are arranged in sequence from the outside to the inside of the borehole. The slurry stop plug is a conical structure with a larger outside and a smaller inside. The outer side of the sealing gasket is glued to the inner side of the tray. The slurry stop plug is interference fitted in the borehole mouth. The anchor is anchored with an ordinary anchor cable and presses the tray and the sealing gasket onto the rock wall around the borehole mouth.

[0007] A center hole is provided in the center of the grouting plug, sealing pad and tray, which is sleeved on the ordinary anchor cable. A coarse through hole and a fine through hole are provided in the grouting plug, sealing pad and tray in a direction parallel to the center line of the drill hole. The coarse through hole is the grouting hole, and the fine through hole is the grouting exhaust hole. The fine through hole is located on the upper part of the grouting plug.

[0008] The grouting pipeline assembly includes a grouting connecting pipe and a grouting through-pipe. The grouting through-pipe is interference-pierced in the grouting hole. The grouting connecting pipe is provided with a flow meter, a pressure gauge and a valve. The inlet end of the grouting connecting pipe is connected to the grouting pump, and the outlet end of the grouting connecting pipe is connected to the outer port of the grouting through-pipe through a quick-plug connector.

[0009] By adopting the above technical solution, compared with the existing technology, the utility model has the following advantages:

[0010] (1) Wider scope of application: Ordinary anchor cables have poor adaptability in complex geological conditions, especially in weak and broken geological conditions where hole formation is difficult. The anchoring performance of ordinary anchor cables is greatly affected. The utility model can enable ordinary anchor cables to achieve grouting function, which is suitable for complex geological conditions such as broken surrounding rock and has a wider scope of application.

[0011] (2) It has a higher strength than the grouting anchor cable: The grouting anchor cable has a lower strength due to the presence of a grouting tube in the anchor cable body. The present invention uses an anchor cable body of an ordinary anchor cable, which is fundamentally stronger than the grouting anchor cable and has better anchoring performance.

[0012] (3) Long-term stability: Ordinary anchor cables are easily affected by factors such as groundwater during use, which can cause erosion on the anchor cable body, resulting in poor long-term stability of ordinary anchor cables. The grouting device added by the present invention also has a certain protective effect on the anchor cable body itself through the anchor body produced by grouting, thereby improving the durability and long-term stability of ordinary anchor cables.

[0013] (4) Cost saving: The cost of grouting anchor cables is higher than that of ordinary anchor cables. Since the utility model can use ordinary anchor cables to complete the operating functions of grouting anchor cables, there is no need to purchase high-cost grouting anchor cables separately, which greatly reduces the tunnel surrounding rock support costs of coal mine production enterprises.

[0014] (5) Safe and reliable: The device and method of the utility model have the advantages of both ordinary anchor cables and grouting anchor cables, with a simple and stable structure. No special equipment is required during its use, and it is safe and reliable to use.

[0015] (6) Easy to use: The grouting pump uses a mining high-pressure grouting pump to achieve the grouting work of ordinary anchor cables, and the grouting operation can be carried out by connecting the grouting connecting pipe with the grouting through-pipe through a quick-connect joint. It has a simple structure and is easy to use.

[0016] (7) Good sealing performance: The stop plug is made of rubber material with a certain elasticity. It is pressed into the borehole by external force, and the outer circle is sealed with the inner wall of the borehole. The center hole is tightly clamped with the ordinary anchor cable under the radial pressure of the outer circle to achieve center sealing. At the same time, a sealing gasket is set, and the inner side of the sealing gasket is pressed and sealed with the outer end face of the stop plug and the outer peripheral rock wall of the borehole respectively. In this way, the leak between the outer circle of the stop plug and the inner circle of the borehole can be sealed twice.

[0017] (8) When grouting into the borehole, the air in the borehole can be discharged outward through the fine through-hole. This can avoid the high pressure generated in the borehole and the resulting large external thrust on the grouting pipeline components, thereby ensuring the safety of the grouting operation. In addition, the fine through-hole can also be used to monitor whether the grouting is full. If grout overflows from the fine through-hole, it means that it is about to be full. The grouting volume and grouting pressure are monitored in real time by a flow meter and a pressure gauge respectively.

[0018] In summary, this new anchor cable combines the advantages of conventional and grouting anchor cables, effectively addressing the challenges associated with roadway anchoring in environments with varying surrounding rock characteristics. This new anchor cable enhances the safety factor of the roadway surrounding rock, effectively reducing the impact of deformation and instability on normal coal mine production, and safeguarding the lives of underground workers. Furthermore, this new anchor cable significantly reduces the cost of roadway surrounding rock support, effectively improving the economic benefits of mining enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is an exploded view of the anchor sealing component. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples.

[0022] Figure 1 and Figure 2 As shown, the utility model is suitable for a high-pressure grouting device of an ordinary anchor cable, comprising a grouting pump 1, a grouting pipeline assembly and an anchor sealing assembly coaxially installed on an ordinary anchor cable 3, a grouting hole 4 being provided on the anchor sealing assembly, the outlet end of the grouting pipeline assembly being passed through the grouting hole 4, and the outlet of the grouting pump 1 being connected to the inlet end of the grouting pipe assembly.

[0023] The anchoring and sealing assembly includes a grouting plug 6, a sealing gasket 7, a tray 8 and an anchor 9 which are arranged in sequence from the outside to the inside along the borehole 5. The grouting plug 6 is a conical structure with a larger outside and a smaller inside. The outer side of the sealing gasket 7 is glued to the inner side of the tray 8. The grouting plug 6 is interference fitted in the opening of the borehole 5. The anchor 9 is anchored to the ordinary anchor cable 3 and presses the tray 8 and the sealing gasket 7 to the rock wall outside the opening of the borehole 5.

[0024] A center hole 10 is provided in the center of the grouting plug 6, the sealing gasket 7 and the tray 8, which is sleeved on the ordinary anchor cable 3. The grouting plug 6, the sealing gasket 7 and the tray 8 are provided with a coarse through hole and a fine through hole in a direction parallel to the center line of the drill hole 5. The coarse through hole is the grouting hole 4, and the fine through hole 11 is the grouting exhaust hole. The fine through hole 11 is located on the upper part of the grouting plug 6.

[0025] The grouting pipeline assembly includes a grouting connecting pipe 12 and a grouting through-pipe 13. The grouting through-pipe 13 is interference-pierced in the grouting hole 4. A flow meter 14, a pressure gauge 15 and a valve 16 are provided on the grouting connecting pipe 12. The inlet end of the grouting connecting pipe 12 is connected to the grouting pump 1, and the outlet end of the grouting connecting pipe 12 is connected to the outer port of the grouting through-pipe 13 through a quick-connect connector 2.

[0026] The specific grouting operation process of the present invention is as follows: first, a hole 5 of about 1m in depth is drilled at a designated location, and the 1m deep hole is expanded. The expansion size should be determined according to the actual project requirements to ensure that the grouting pipe 13 can smoothly carry out the grouting operation. Then, the drilling operation 5 is continued, but the expansion operation is not required.

[0027] After drilling is complete, the anchor cable is driven into the borehole 5 and anchored at the bottom of the borehole 5. The stopper 6 is then inserted onto the anchor cable. The grouting pipe 13 is then inserted into the coarse through-hole of the stopper 6. The tray 8 and gasket 7 are then installed onto the anchor cable and the grouting pipe 13. The anchor 9 is then installed (the structure of the anchor 9 and its connection to the anchor cable 3 are conventional). The stopper 6 is inserted into the borehole 5. The inner surface of the gasket 7 presses against the stopper 6 and the outer surface of the rock wall. Finally, the grouting connection pipe 12 is connected to the outer end of the grouting pipe 13 via the quick-connect connector 2. The grouting pump 1 is then started to begin grouting. Slurry is injected into the borehole 5, and air within the borehole 5 is expelled through the fine through-hole 11 until slurry begins to seep out of the outer end of the fine through-hole 11, indicating that the slurry is nearly full. Grouting continues until the pressure gauge 15 reaches the predetermined pressure, after which the grouting pump 1 and valve 16 are closed.

[0028] The above embodiments illustrate the basic principles and features of the present invention. However, the above merely illustrates preferred embodiments of the present invention and is not intended to limit the present invention to the embodiments described. Persons skilled in the art, inspired by this patent, may make various modifications and improvements without departing from the spirit of the present invention and the scope of protection of the claims, all of which fall within the scope of protection of the present invention. Therefore, the patent and scope of protection of this utility model shall be subject to the appended claims.

Claims

1. High-pressure grouting device suitable for ordinary anchor cables, characterized by: It includes a grouting pump, a grouting pipeline assembly and an anchor sealing assembly coaxially installed on a common anchor cable. The anchor sealing assembly is provided with a grouting hole, the outlet end of the grouting pipeline assembly is passed through the grouting hole, and the grouting pump outlet is connected to the grouting pipe assembly inlet end.

2. The high-pressure grouting device suitable for ordinary anchor cables according to claim 1, characterized in that: The anchoring and sealing assembly includes a slurry stop plug, a sealing gasket, a tray and an anchor which are arranged in sequence from the outside to the inside of the borehole. The slurry stop plug is a conical structure with a larger outside and a smaller inside. The outer side of the sealing gasket is glued to the inner side of the tray. The slurry stop plug is interference fitted in the borehole mouth. The anchor is anchored with an ordinary anchor cable and presses the tray and the sealing gasket onto the rock wall around the borehole mouth.

3. The high-pressure grouting device for common anchor cables according to claim 2, characterized in that: A center hole is provided in the center of the grouting plug, sealing pad and tray, which is sleeved on the ordinary anchor cable. A coarse through hole and a fine through hole are provided in the grouting plug, sealing pad and tray in a direction parallel to the center line of the drill hole. The coarse through hole is the grouting hole, and the fine through hole is the grouting exhaust hole. The fine through hole is located on the upper part of the grouting plug.

4. The high-pressure grouting device for common anchor cables according to claim 1, 2 or 3, characterized in that: The grouting pipeline assembly includes a grouting connecting pipe and a grouting through-pipe. The grouting through-pipe is interference-pierced in the grouting hole. The grouting connecting pipe is provided with a flow meter, a pressure gauge and a valve. The inlet end of the grouting connecting pipe is connected to the grouting pump, and the outlet end of the grouting connecting pipe is connected to the outer port of the grouting through-pipe through a quick-plug connector.

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