Grouting device for overlying strata separation layer grouting orifice and using method of grouting device

Abstract

The invention relates to the technical field of bed separation grouting, in particular to an overlying strata bed separation grouting orifice grouting device and a using method thereof. The device comprises a drill hole, a sleeve, an outer pipe in sliding sealing and a built-in grouting pipe, a one-way device is arranged at the lower end of the outer pipe, ventilation and liquid blocking are achieved through a floating ball and a filter screen, and the one-way device is connected with a water tank and a pressure relief system; the upper portion of the outer pipe is linked with a gear-rack transmission mechanism through a sliding frame to control the slurry discharging valve to be automatically opened and closed. During grouting, the one-way device feeds back air pressure according to the height of grout, the outer pipe is pushed to lift the grouting pipe, and automatic adjustment of the grouting height is achieved; and when the slurry reaches the top of the separation layer, the slurry discharge valve is opened to discharge upper-layer water. The problems of inaccurate positioning of the grouting pipe, waste of slurry separation and tedious manual operation are solved, and the grouting device has the advantages of accurate grouting, material saving, high automation degree and high safety.

Description

Technical Field

[0001] The invention relates to the technical field of separation layer grouting, and in particular to a grouting device for grouting a separation layer of an overburden rock and a use method thereof. Background Art

[0002] After coal is mined, the surface will sink. In order to control the surface settlement, slurry can be injected into the abscission layer (underground space). After the slurry solidifies, it can play a role in supporting and inhibiting the surface sinking. The existing technology injects the configured slurry into the underground abscission layer space, and the slurry is prepared with water, cement and other binding materials in the grouting station. First, drill a hole at the designated location in the design, lower the casing after the hole is drilled, and use cement to stick the casing and the hole wall. Then, lower the grouting pipe in the casing, extend the grouting pipe to the designated underground location (i.e., the abscission layer), install the hole mouth grouting device at the borehole mouth (i.e., the end of the grouting pipe), and connect the grouting pipe in the grouting station to start grouting.

[0003] The existing technical solution needs to lower the grouting pipe to a height close to the upper end of the separation layer space, so as to obtain a better grouting effect, but it is not convenient to judge the actual placement position. If the height of the grouting pipe is too low, a cavity will be formed at the grouting pipe position when the grouting pipe is pulled out after the grouting is completed, thereby reducing the structural strength here. In addition, when the existing technical solution is implemented, the grouting slurry will produce liquid separation on the surface, that is, water will gather in the upper layer of the slurry. It is necessary to manually switch and close the valve of the grouting pipe and then open the valve of the grouting pipe to discharge the slurry. However, in this process, one is that the manual switching labor is large, and the other is that when the upper layer of water-containing slurry is discharged outward, the concrete slurry originally in the vertical grouting pipe will be discharged together, resulting in a waste of concrete slurry.

[0004] To this end, the present application designs a grouting device for grouting a separation layer of overburden and a method of using the same to solve the above-mentioned problems. Summary of the invention

[0005] In order to make up for the deficiencies in the prior art, the present invention provides a grouting device for grouting a separation layer of an overburden rock, comprising a drilling hole, characterized in that: A casing is fixed in the borehole by sealing concrete, and a mounting flange is provided at the upper end of the casing; an outer tube is slidably and sealably inserted into the mounting flange, and a grouting tube is concentrically sleeved in the outer tube, and the lower end of the grouting tube extends to the bottom of the outer tube; a one-way device is provided at the lower end of the outer tube, and the one-way device includes a chamber, a float in the chamber and a lower filter, and the one-way device is connected to the water tank through a connecting hose; the upper end of the outer tube is connected to the mounting tube, and a slurry discharge valve is provided on the mounting tube, and a gear is installed on the switch shaft of the slurry discharge valve, which meshes with the rack on the sliding frame; the sliding frame is slidably mounted on the upper part of the outer tube, and is connected to the outer tube by a tension spring, and a trigger block is provided on one side of the sliding frame, which is used to trigger the slurry discharge valve to open when the outer tube rises to a set height.

[0006] Furthermore, in order to better implement the present invention, the density of the float is smaller than that of the slurry and larger than that of water, and the pore size of the filter is smaller than the diameter of the slurry particles.

[0007] Furthermore, in order to better realize the present invention, a recoil piston is provided on the upper part of the water tank, and the recoil piston is connected to the connecting hose through a door-type tube. Pressing the recoil piston can cause the water flow to reversely flush the filter.

[0008] Furthermore, in order to better realize the present invention, a spare pipe is provided on the casing, the spare pipe is connected in parallel with a pressure sensor and a No. 2 pressure relief valve, the No. 2 pressure relief valve is covered with a closed chamber, and the closed chamber is provided with a manual valve.

[0009] Based on the above-mentioned overburden separation grouting hole grouting device, its use method is as follows: S1, grouting stage, slurry is injected into the abscission space through the grouting pipe. When the liquid level reaches the lower end of the outer tube, the float closes the single-pass device, and the air pressure pushes the outer tube upward; S2, slurry discharge stage, when the outer tube rises to the trigger block position, the sliding frame drives the slurry discharge valve to open and discharge the upper layer of water-containing slurry; S3, emergency treatment, when the pressure sensor detects abnormal pressure, open the valve of the closed chamber and release the pressure through the No. 2 pressure relief valve.

[0010] Furthermore, in order to better implement the present invention, the rising height of the outer tube in S1 is automatically adjusted by air pressure feedback of the single-pass device.

[0011] Furthermore, in order to better implement the present invention, the triggering condition for the slurry discharge stage in S2 is that the outer pipe rises to a preset elevation at the top of the separation space.

[0012] The beneficial effects of the present invention are: Automatic adjustment of grouting height: Through the coordinated use of the single-pass device and the outer pipe, the position of the grouting pipe can be automatically adjusted according to the height of the slurry in the abscission space, avoiding the problem of manual judgment of the placement of the grouting pipe, thereby reducing the risk of reduced structural strength due to improper positioning of the grouting pipe.

[0013] Prevent waste caused by slurry separation: When the grouting reaches a certain height, the float mechanism in the single-pass device will close the single-pass device to prevent moisture from entering, thereby increasing the air pressure in the delamination space to push the outer tube to automatically rise; and the slurry with a higher water content in the upper part will be automatically discharged through the slurry discharge valve, which can effectively reduce the waste of concrete slurry and ensure the quality of the slurry injected into the delamination space.

[0014] Simplify the operation process and reduce labor intensity: The automatic pressure relief and backwash system is used to deal with problems such as excessive air pressure and blockage of single-pass devices. Frequent manual intervention to switch valves is no longer required, which greatly reduces the workload of operators.

[0015] Improve safety and reliability: By setting up a pressure sensor to monitor pressure changes and activating the No. 2 pressure relief valve for emergency pressure relief when the pressure is abnormal, the safety and stability of the system are increased. In addition, the design of the recoil piston also facilitates the cleaning and maintenance of the filter, ensuring the reliability of the long-term operation of the equipment.

[0016] Enhanced grouting effect: The entire process more accurately controls various parameters in the grouting process, such as slurry distribution, air pressure management, etc., which helps to obtain a more uniform and firmer filling effect, thereby improving the quality of the overall project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a partial enlarged view of the single-pass device of the present invention; Figure 3 It is a partial view of the outer tube part of the present invention.

[0018] In the figure, 1. Drilling, 2. Sealing concrete, 3. Casing, 4. Mounting flange, 5. Outer pipe, 6. Grouting pipe, 7. Feed pipe, 8. Discharge pipe, 9. Mounting pipe, 10. Single-pass device, 11. Connecting hose, 12. Water tank, 13. Stop valve, 14. Gate pipe, 15. No. 1 pressure relief valve, 16. Recoil piston, 17. Spare pipe, 18. Pressure sensor, 19. No. 2 pressure relief valve, 20. Closed chamber, 21. Sliding frame, 22. Tension spring, 23. Rack, 24. Discharge valve, 25. Gear, 26. Trigger block, 27. Chamber, 28. Float, 29. Filter. DETAILED DESCRIPTION

[0019] 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. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0021] Figure 1-Figure 3 It is a specific embodiment of the present invention, which is a grouting device for grouting a separation layer of overburden, including a borehole 1 on the ground, a casing 3 is installed in the borehole 1 through a blocking concrete 2, a mounting flange 4 is installed on the upper end of the casing 3, an outer tube 5 is slidably and sealedly inserted in the mounting flange 4, a grouting pipe 6 is installed in the outer tube 5 in the form of a concentric casing, the lower end of the grouting pipe is lower than the outer tube 5, a feed pipe 7 is connected to the upper end of the grouting pipe 6, a slurry discharge pipe 8 is connected to the upper end of the outer tube 5, the upper part of the outer tube 5 is a mounting pipe 9, the mounting pipe 9 and the outer tube 5 are an integrated structure, a single-way device 10 is installed at the lower end of the outer tube 5, the single-way device 10 is a gas-permeable but liquid-proof structure, a connecting hose 11 is connected to the connecting hose 11, a water tank 12 is connected to the connecting hose 11, a stop valve 13 is installed on the connecting hose 11, and the connecting hose 11 and the water tank 12 is connected through a gate-type pipe 14, a No. 1 pressure relief valve 15 is installed on the upper part of the water tank 12, a recoil piston 16 is slidably inserted on the upper part of the water tank 12, a spare pipe 17 is installed on the sleeve 3, a pressure sensor 18 is connected in parallel to the spare pipe 17, a No. 2 pressure relief valve 19 is installed on the spare pipe 17, a closed chamber 20 is arranged on the outer sleeve of the No. 2 pressure relief valve 19, a valve is installed on the closed chamber 20, a sliding frame 21 is slidably sleeved on the upper part of the outer tube 5, a tension spring 22 is connected to the sliding frame 21, the upper end of the tension spring 22 is connected to the outer tube 5, a rack 23 is installed on the sliding frame 21, a slurry discharge valve 24 is installed on the upper end of the mounting pipe 9, a gear 25 is installed on the switch shaft on the slurry discharge valve 24, the gear 25 and the rack 23 are engaged, a trigger block 26 is installed on the sleeve on one side of the sliding frame 21, and the trigger block 26 corresponds to the raised position on one side of the sliding frame 21. A chamber 27 is provided in the single-pass device 10 , a floating ball 28 is provided in the chamber 27 , and a filter screen 29 is installed at the lower end of the single-pass device 10 .

[0022] The grouting method of this embodiment is: First, the device is constructed and installed after the drilling is completed. After the installation is completed, the material is fed through the feed pipe, and then the grouting is carried out in the delamination space through the grouting pipe. During grouting, there is air pressure in the delamination space. When the air pressure reaches the set value, the gas is passed through the single-way device, and then the gas enters the water tank. Since the air pressure exceeds the threshold of the No. 1 pressure relief valve, the No. 1 pressure relief valve works to discharge the excessive air pressure in the delamination space, thereby preventing the air pressure in the delamination space from being too high, resulting in poor grouting of the feed pipe. When the grouting height reaches the height of the lower end of the outer pipe, the water on the upper part of the grouting enters the single-way device through the filter under the action of the pressure. Under the action of the float in the single-way device, the float rises to block the single-way device, thereby forming a closed structure. At this time, during grouting, the outer pipe The air pressure increases, which pushes the outer tube to rise on the mounting flange, and then the grouting height of the grouting pipe is automatically raised. When it is raised to a certain height, the gas enters from the single-pass device, and then the pressure is released. When the grouting height is raised again, the above process is repeated. When the grouting height reaches the top height of the separation space, the outer tube rises to the position where the sliding frame just touches the trigger block. At this time, when the outer tube continues to rise, the trigger block squeezes the sliding frame, so that the sliding frame overcomes the tension of the tension spring and moves downward relative to the outer tube, so that the rack drives the gear to rotate, and the gear rotation drives the slurry discharge valve to open, and then the outer tube discharges the water-rich slurry in the upper part of the grouting slurry from the slurry discharge pipe through the outer tube, thereby realizing the automatic discharge of the upper water-containing slurry. When the slurry begins to be discharged, the grouting work is ended and the device is dismantled. When the pressure sensor senses that the pressure is too high, it means that the single-pass device is blocked. At this time, the valve of the closed chamber is opened, and the gas is discharged outward through the No. 2 pressure relief valve. By pressing the recoil piston downward, the water in the water tank passes through the gate pipe and the connecting hose to recoil the filter downward.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A grouting device for grouting a separation layer of an overburden rock, comprising a borehole (1), characterized in that: A casing (3) is fixed inside the borehole (1) through the sealing concrete (2), and a mounting flange (4) is provided at the upper end of the casing (3); an outer tube (5) is inserted and slidably sealed on the mounting flange (4), a grouting tube (6) is concentrically sleeved inside the outer tube (5), and the lower end of the grouting tube (6) extends below the outer tube (5); a single-pass device (10) is provided at the lower end of the outer tube (5), and the single-pass device (10) includes a chamber (27), a floating ball (28) in the chamber (27), and a filter screen (29) at the lower end, and the single-pass device (10) is connected to the outer tube (5) by The hose (11) is connected to the water tank (12); the upper end of the outer tube (5) is connected to the mounting tube (9), a slurry discharge valve (24) is provided on the mounting tube (9), a gear (25) is installed on the switch shaft of the slurry discharge valve (24), and meshes with the rack (23) on the sliding frame (21); the sliding frame (21) is slidably mounted on the upper part of the outer tube (5), and is connected to the outer tube (5) via a tension spring (22); a trigger block (26) is provided on one side of the sliding frame (21), which is used to trigger the slurry discharge valve (24) to open when the outer tube (5) rises to a set height.

2. The overburden separation grouting hole grouting device according to claim 1 is characterized in that: The density of the float (28) is smaller than that of the slurry and larger than that of water, and the pore size of the filter (29) is smaller than the diameter of the slurry particles.

3. The overburden separation grouting hole grouting device according to claim 1 is characterized in that: A recoil piston (16) is provided on the upper portion of the water tank (12). The recoil piston (16) is connected to the connecting hose (11) via a gate-shaped tube (14). Pressing the recoil piston (16) can cause water to flow in reverse to flush the filter screen (29).

4. The overburden separation grouting hole grouting device according to claim 1 is characterized in that: The casing (3) is provided with a spare pipe (17), the spare pipe (17) is connected in parallel with a pressure sensor (18) and a No. 2 pressure relief valve (19), the No. 2 pressure relief valve (19) is covered with a sealed chamber (20), and the sealed chamber (20) is provided with a manual valve.

5. A method for using a grouting device for grouting a separation layer of an overburden rock, based on the grouting device for grouting a separation layer of an overburden rock according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, grouting stage, grout is injected into the separation space through the grouting pipe (6), when the liquid level reaches the lower end of the outer tube (5), the float (28) closes the single-pass device (10), and the air pressure pushes the outer tube (5) upward; S2, slurry discharge stage, when the outer tube (5) rises to the position of the trigger block (26), the sliding frame (21) drives the slurry discharge valve (24) to open and discharge the upper layer of water-containing slurry; S3, emergency treatment, when the pressure sensor (18) detects abnormal pressure, the valve of the closed chamber (20) is opened to release the pressure through the No. 2 pressure relief valve (19).

6. The method for using the overburden separation grouting hole grouting device according to claim 5 is characterized in that: In S1, the rising height of the outer tube (5) is automatically adjusted by air pressure feedback from the single-pass device (10).

7. The method for using the overburden separation grouting hole grouting device according to claim 5, characterized in that: The triggering condition for the slurry discharge stage in S2 is that the outer pipe (5) rises to a preset elevation at the top of the absorptive space.

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