Grouting reinforcement device for orifice section of rock burst pressure relief drill hole

Abstract

The utility model relates to the technical field of coal mine rock burst, in particular to a rock burst pressure relief drill hole orifice section grouting reinforcement device which comprises a blocking device, an in-hole grouting hard pipe, a hole sealing assembly and a grouting mechanism which are sequentially connected. The plugging device is detachably connected with the head of the in-hole grouting hard pipe, a through hole is formed in the center of the hole sealing assembly, the tail of the in-hole grouting hard pipe is connected with the through hole in a sealed and sliding mode, and the grouting mechanism at least comprises a grouting pump and a pumping hose. One end of the pumping hose is connected with the grouting pump, and the other end of the pumping hose is connected with the tail of the in-hole grouting hard pipe. The grouting and reinforcing device can only conduct grouting and reinforcing on cracks of the hole opening section of the rock burst pressure relief drill hole in the roadway, coal body crack expansion is restrained, and stability of roadway surrounding rock is guaranteed; meanwhile, the drilling deep pressure relief effect is not affected, the impact risk is weakened, and rock burst prevention of the roadway is achieved; the grouting reinforcement device is easy to implement, rapid in construction, low in economic cost and good in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine rock burst, in particular to a rock burst relief drilling hole mouth section grouting reinforcement device. Background Art

[0002] Deep coal mining faces the risk of rock burst. Currently, there are a variety of active pressure relief methods for managing rock burst, among which drilling pressure relief is an effective active pressure relief method. Pressure relief boreholes with a diameter of 100-150 mm and a depth of 10-15 m are usually arranged at intervals of 1-3 m along the axial direction of the tunnel to release deep stratum stress and reduce the risk of rock burst. However, pressure relief drilling will cause the development of internal cracks in the tunnel surrounding rock and reduce the bearing capacity. That is, the pressure relief drilling will weaken the surrounding rock near the tunnel, causing the deformation of the tunnel to increase, and even causing the damage to the tunnel wall, which will have a negative impact on the safety of the tunnel and the working face. Therefore, how to ensure the stability of the tunnel while ensuring that the pressure relief drilling can achieve pressure relief has become a difficult problem that urgently needs to be solved in this field. Utility Model Content

[0003] In order to solve the aforementioned technical problems, the utility model provides a grouting reinforcement device for the borehole mouth section of an impact ground pressure relief borehole, comprising a plugging device, an in-hole grouting rigid pipe, a sealing assembly and a grouting mechanism connected in sequence; the plugging device is detachably connected to the head of the in-hole grouting rigid pipe, a through hole is provided at the center of the sealing assembly, the tail of the in-hole grouting rigid pipe is sealingly and slidingly connected to the through hole, the grouting mechanism comprises at least a grouting pump and a pumping hose, one end of the pumping hose is connected to the grouting pump and the other end is connected to the tail of the in-hole grouting rigid pipe.

[0004] Preferably, the plugging device includes a rubber gasket and a cap-shaped plug, the cap-shaped plug includes a circular sealing plate and a connecting circular tube, the rubber gasket is fixedly connected to the outer periphery of the sealing plate, and the sealing plate and the head of the connecting circular tube are fixedly connected.

[0005] Preferably, the central axes of the circular sealing plate and the connecting circular tube are collinear.

[0006] Preferably, the in-hole grouting hard pipe includes an end rod relatively far away from the hole opening and a push rod relatively close to the hole opening, the end rod and the push rod are both hollow circular tubes, and the end rod and the push rod are detachably connected.

[0007] Preferably, the push rod comprises one or more push rods, and the multiple push rods are detachably connected.

[0008] Preferably, the plugging device is detachably connected to the head of the grouting hard pipe in the hole, specifically, the head of the end rod and the tail of the connecting circular pipe are detachably connected, and the outer diameter of the head of the end rod is slightly smaller than or equal to the inner diameter of the connecting circular pipe.

[0009] Preferably, the blocking device is detachably connected to the head of the grouting rigid pipe in the hole, specifically, the head of the end rod and the tail of the connecting circular pipe are detachably connected by a rotating locking assembly, a locking bolt is radially fixed on the connecting circular pipe, and an L-shaped locking groove is arranged at the head of the end rod, one side of the L-shaped locking groove is co-directional with the axis of the end rod and extends to the top of the head of the end rod; the locking bolt can move in the L-shaped locking groove.

[0010] Preferably, the sealing assembly includes a sealing plate, sealing bolts, a first leak-proof gasket and a sealing plug. A through hole is arranged at the center of the sealing plate, and the outer ring of the first leak-proof gasket is fixed on the through hole. The grouting hard pipe in the hole can pass through the inside of the first leak-proof gasket and realize a sealed sliding connection. Bolt holes are evenly arranged along the circumference of the sealing plate, and the sealing bolts pass through the bolt holes.

[0011] Preferably, the hole sealing assembly further comprises a hole sealing plug, which is in the form of a cap-shaped plug and is made of metal material or is made into an elastic plug.

[0012] Preferably, the grouting mechanism also includes a hose connector assembly and a slurry pool, the discharge port of the grouting pump is connected to one end of the pumping hose, the feed port of the grouting pump is connected to the slurry pool, and the other end of the pumping hose is provided with a hose connector assembly, and the hose connector assembly is detachably connected to the tail of the outermost push rod.

[0013] Preferably, the hose connector assembly is formed by enlarging the diameter of the other end of the pumping hose so as to insert the tail of the outermost push rod therein.

[0014] Preferably, the hose connector assembly includes a hose fixing connector, a movable threaded head and a second leak-proof gasket, one end of the hose fixing connector is connected to the hose, the other end of the hose fixing connector is circumferentially provided with an annular protrusion, an annular groove is provided inside one end of the movable threaded head, the annular protrusion can enter the annular groove, and a second leak-proof gasket is provided between the annular protrusion and the annular groove, so that the annular protrusion and the annular groove can be rotatably sealed and connected.

[0015] The utility model provides a grouting reinforcement device for the mouth section of an impact rock pressure relief borehole, which has the following beneficial effects: the grouting reinforcement device can only perform grouting reinforcement on the cracks in the mouth section of the impact rock pressure relief borehole in the tunnel, thereby inhibiting the expansion of coal body cracks and ensuring the stability of the tunnel surrounding rock; the grouting reinforcement device only performs grouting on the borehole mouth section, which does not affect the deep release of deep stratum stress (pressure relief) in the borehole, can reduce the impact risk, and realize the prevention and control of impact rock pressure in the tunnel; the grouting reinforcement device is easy to implement, fast to construct, low in economic cost, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of the grouting reinforcement device of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the end rod, the push rod and the cap-shaped plug of the utility model;

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the end rod and the cap-shaped plug of the utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the sealing component of the utility model;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the hose connector assembly of the utility model;

[0021] Figure 6 It is a schematic diagram of the orifice section of the grouting reinforcement pressure relief drilling hole of the grouting reinforcement device of the utility model.

[0022] In the figure: 1-rubber gasket, 2-hat-shaped plug, 21-sealing plate, 22-connecting round pipe, 3-end rod, 4-rotation locking assembly, 41-locking bolt, 42-locking groove, 5-push rod, 6-threaded mouth (internal thread), 7-threaded head (external thread), 8-sealing assembly, 81-sealing plate, 82-sealing bolt, 83-first leak-proof gasket, 84-sealing plug, 9-hose joint assembly, 91-hose fixed joint, 92-movable threaded head (external thread), 93-second leak-proof gasket, 10-grouting pump, 11-slurry pool, 12-feed port, 13-discharge port, 14-pumping hose. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] like Figure 1-5 As shown, a grouting reinforcement device for the orifice section of an impact ground pressure relief drilling hole of the utility model comprises a plugging device, a grouting hard pipe in the hole, a sealing assembly 8 and a grouting mechanism connected in sequence; the plugging device comprises a rubber gasket 1 and a cap-shaped plug 2, the cap-shaped plug comprises a circular plugging plate 21 with a certain thickness and a connecting circular tube 22, the diameter of the plugging plate 21 is equivalent to the diameter of the pressure relief drilling hole, a rubber gasket 1 is fixedly connected to the outer periphery of the plugging plate 21, the central axes of the circular plugging plate 21 and the connecting circular tube 22 are in a colinear line, and the plugging plate 21 and the head of the connecting circular tube 22 are fixedly connected;

[0025] like Figure 2As shown, the in-hole grouting hard pipe includes an end rod 3 relatively far away from the orifice and a push rod 5 relatively close to the orifice, the end rod 3 and the push rod 5 are both hollow circular tubes, the end rod 3 and the push rod 5 are detachably connected, according to the length of the orifice section required for grouting of the pressure relief drilling, the push rod may include multiple push rods, and the multiple push rods 5 are detachably connected; wherein the detachable connection method includes providing a threaded opening 6 at the tail of the end rod 3, that is, providing an internal thread at the tail of the end rod 3; providing a threaded head 7, that is, an external thread, at the head of the push rod 5; providing a threaded opening 6, that is, an internal thread, at the tail of the push rod 5, and adopting a threaded connection form to realize the detachable connection;

[0026] The head of the end rod 3 and the tail of the connecting tube 22 are detachably connected. For example, the outer diameter of the head of the end rod 3 is slightly smaller than or equal to the inner diameter of the connecting tube 22, so that the head of the end rod 3 can enter the interior of the connecting tube 22; in order to facilitate detachability and ensure stability during connection; preferably, as Figure 3 As shown, the head of the end rod 3 and the tail of the connecting tube 22 are detachably connected by a rotating locking assembly 4. Specifically, a locking bolt 41 is fixed radially on the connecting tube 22, and an L-shaped locking groove 42 is provided at the head of the end rod 3. One side of the L-shaped locking groove 42 is co-directional with the axis of the end rod 3 and extends all the way to the top of the head of the end rod 3; the locking bolt 41 can move in the L-shaped locking groove 42.

[0027] The sealing assembly 8 is located on the outermost section, that is, the section of the push rod 5 closest to the orifice, and is located on one side of the tail of the push rod 5. Figure 4 As shown, the sealing assembly 8 includes a sealing plate 81, a sealing bolt 82, a first leakproof gasket 83 and a sealing plug 84. A through hole is provided at the center of the sealing plate 81. The outer ring of the first leakproof gasket 83 is fixed on the through hole. The grouting hard pipe in the hole can pass through the first leakproof gasket 83 to achieve a sealed sliding connection. The sealing plug 84 can pass through the first leakproof gasket 83 to achieve a sealed connection. The structure of the sealing plug 84 can adopt the form of the cap-shaped plug 2 of the present embodiment, made of metal material, or it can be just a plug, such as a plug similar to a medical hanging bottle. In this case, it can be made of rubber material to make it have a certain elasticity; the diameter of the sealing plate 81 is larger than the diameter of the pressure relief drilling hole, preferably 3 to 5 times the diameter of the pressure relief drilling hole, and bolt holes are evenly arranged along the circumference of the sealing plate 81, and the sealing bolts 82 pass through the bolt holes;

[0028] The grouting mechanism includes a hose connector assembly 9, a grouting pump 10, a slurry pool 11 and a pumping hose 14. The discharge port 13 of the grouting pump 10 is connected to one end of the pumping hose 14, the feed port 12 of the grouting pump 10 is connected to the slurry pool 11, and the other end of the pumping hose 14 is provided with a hose connector assembly 9, which is detachably connected to the tail of the outermost push rod 5 through the hose connector assembly 9;

[0029] The hose connector assembly 9 can be simply a detachable connection between the pumping hose 14 and the push rod 5 by enlarging the diameter of the other end of the pumping hose 14 so that the tail of the outermost push rod 5 can be inserted therein; of course, in order to improve the convenience and sealing of the connection, it is preferred that Figure 5 As shown, the hose connector assembly 9 includes a hose fixing connector 91, a movable threaded head 92 and a second leak-proof gasket 93. One end of the hose fixing connector 91 is connected to the hose, such as by gluing or hot-melt connection. The other end of the hose fixing connector 91 is circumferentially provided with an annular protrusion, and an annular groove is provided inside one end of the movable threaded head 92. The annular protrusion can enter the annular groove. A second leak-proof gasket 93 is provided between the annular protrusion and the annular groove, so that the annular protrusion and the annular groove are rotatably and sealedly connected, that is, the hose fixing connector 91 is rotatably and sealedly connected to the movable threaded head 92. The other end of the movable threaded head 92 adopts a threaded head structure, that is, an external thread is provided, and a detachable connection is achieved with the threaded opening 6 at the tail end of the push rod 5 through a threaded connection.

[0030] like Figure 6 As shown, the working mechanism of the utility model, that is, the method of reinforcing the pressure relief borehole mouth section using the grouting reinforcement device of the utility model, comprises the following steps:

[0031] a. Pressure relief holes are constructed in the rock burst tunnel. Pressure relief holes are constructed on both sides of the tunnel. Figure 6 Only one section is shown in the figure. The diameter of the pressure relief borehole is 150mm and the depth is 10m. According to the damage characteristics of the surrounding rock of the tunnel, the hole section near the hole mouth of the pressure relief borehole is prepared for grouting reinforcement. The hole mouth section is 4m long and the hole bottom section is 6m long.

[0032] b. Reference Figure 1 , prepare and assemble the plugging device, the grouting hard pipe in the hole, the sealing component 8 (excluding the sealing plug 84) and the grouting mechanism, refer to Figure 2 Connect the plugging device to the grouting hard pipe in the hole; Figure 6 Push the plugging device and the in-hole grouting hard pipe into the pressure relief borehole, and make the plugging device reach the set position, that is, the deepest part of the hole section;

[0033] c. Reference Figure 6 The sealing assembly 8 is passed through the tail of the outermost push rod 5 and fixed on the tunnel wall with the sealing bolt 82; Figure 6Connect the hose connector assembly 9 of the grouting mechanism to the tail of the outermost push rod 5;

[0034] d. Prepare grouting material in the slurry pool, wherein the grouting material is made by mixing cement and water with a water-cement ratio of 0.5; Reference Figure 1 Separate the plugging device from the end rod of the grouting hard pipe in the hole so that the plugging device isolates the bottom section of the hole from the hole mouth section, turn on the grouting pump 10, and reinforce the hole mouth section by grouting while pulling out the grouting hard pipe in the hole; after the grouting is completed, that is, after the grouting hard pipe is pulled out, use the hole plug 84 to seal the through hole of the sealing assembly 8.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grouting reinforcement device for the borehole section of a rock burst pressure relief borehole, characterized in that: It comprises a plugging device, an in-hole grouting rigid pipe, a hole sealing component and a grouting mechanism which are connected in sequence; the plugging device is detachably connected to the head of the in-hole grouting rigid pipe, a through hole is provided at the center of the hole sealing component, the tail of the in-hole grouting rigid pipe is sealingly and slidingly connected to the through hole, the grouting mechanism comprises at least a grouting pump and a pumping hose, one end of the pumping hose is connected to the grouting pump and the other end is connected to the tail of the in-hole grouting rigid pipe; the plugging device comprises a rubber gasket and a cap-shaped plug, the cap-shaped plug comprises a circular plugging plate and a connecting circular pipe, a rubber gasket is fixedly connected to the outer periphery of the plugging plate, and the plugging plate and the head of the connecting circular pipe are fixedly connected.

2. The hole section grouting reinforcement device according to claim 1 is characterized in that: The in-hole grouting hard pipe includes an end rod relatively far away from the hole opening and a push rod relatively close to the hole opening, the end rod and the push rod are both hollow circular tubes, and the end rod and the push rod are detachably connected; the push rod includes one or more, and multiple push rods are detachably connected.

3. The hole section grouting reinforcement device according to claim 2 is characterized in that: The plugging device is detachably connected to the head of the grouting hard pipe in the hole, specifically, the head of the end rod and the tail of the connecting round pipe are detachably connected, and the outer diameter of the head of the end rod is slightly smaller than or equal to the inner diameter of the connecting round pipe.

4. The hole section grouting reinforcement device according to claim 2 is characterized in that: The plugging device is detachably connected to the head of the grouting rigid pipe in the hole, specifically, the head of the end rod and the tail of the connecting circular pipe are detachably connected by a rotating locking assembly, a locking bolt is radially fixed on the connecting circular pipe, and an L-shaped locking groove is arranged at the head of the end rod, one side of the L-shaped locking groove is co-directional with the axis of the end rod and extends all the way to the top of the head of the end rod; the locking bolt can move in the L-shaped locking groove.

5. The hole section grouting reinforcement device according to claim 2, 3 or 4, characterized in that: The sealing assembly includes a sealing plate, sealing bolts, a first leak-proof gasket and a sealing plug. A through hole is arranged at the center of the sealing plate, and the outer ring of the first leak-proof gasket is fixed on the through hole. The grouting hard pipe in the hole can pass through the inside of the first leak-proof gasket and realize a sealed sliding connection. Bolt holes are evenly arranged along the circumference of the sealing plate, and the sealing bolts pass through the bolt holes.

6. The hole section grouting reinforcement device according to claim 5 is characterized in that: The hole sealing component also includes a hole sealing plug, which is in the form of a cap-shaped plug and is made of metal material or is made into an elastic plug.

7. The hole section grouting reinforcement device according to claim 6 is characterized in that: The grouting mechanism also includes a hose connector assembly and a slurry pool. The discharge port of the grouting pump is connected to one end of a pumping hose, the feed port of the grouting pump is connected to the slurry pool, and the other end of the pumping hose is provided with a hose connector assembly, which is detachably connected to the tail of the outermost push rod.

8. The hole section grouting reinforcement device according to claim 7 is characterized in that: The hose connector assembly is formed by enlarging the diameter of the other end of the pumping hose so as to insert the tail of the outermost push rod into the hose connector.

9. The hole section grouting reinforcement device according to claim 7, characterized in that: The hose connector assembly includes a hose fixing connector, a movable threaded head and a second leak-proof gasket. One end of the hose fixing connector is connected to the hose. The other end of the hose fixing connector is circumferentially provided with an annular protrusion. An annular groove is provided inside one end of the movable threaded head. The annular protrusion can enter the annular groove. A second leak-proof gasket is provided between the annular protrusion and the annular groove so that the annular protrusion and the annular groove can be rotatably sealed and connected.

Images