Triple pipe type double-liquid grouting plug and grouting device

Abstract

The utility model relates to a triple pipe type double-liquid grouting plug and a grouting device. The triple pipe type double-liquid grouting plug comprises a triple pipe assembly, a triple pipe connector, a conversion connector, a grouting plug assembly and a hose connector assembly. Compared with a device in the prior art, the device is low in descending and recycling accident rate, stable in setting and unsetting performance and capable of effectively separating hole sections, so that the hole sweeping workload is reduced, the operation difficulty is reduced, the slurry setting time is controllable, invalid diffusion of slurry is effectively prevented, grouting materials are saved, the grouting targeting performance is accurate, and the grouting efficiency is improved. And a water-rich stratum with relatively high underground water flow velocity and flow can be quickly blocked. Particularly, a triple pipe assembly is additionally arranged in the device and is matched with other parts for use, so that the double-liquid slurry in-pipe separated conveying and out-pipe mixed pouring can be realized, and the risks that the double-liquid slurry is quickly solidified to block a grouting pipeline after being mixed in the pipe and the double-liquid slurry is damaged due to extrusion, congestion, excessive stretching and the like in the descending and recycling processes are avoided.

Description

Technical Field

[0001] The utility model relates to the field of grouting plugs, in particular to a triple-tube double-liquid grouting plug and a grouting device. Background Art

[0002] Dual-liquid slurry segmented grouting devices are primarily used in water conservancy and hydropower, highway, railway, municipal engineering, and mining engineering. They are used for controlled grouting to reinforce and plug unfavorable strata such as goafs, caves, fault zones, and fracture zones. Grouting types primarily include pre-grouting, backfill grouting, backfill grouting, and dynamic water grouting. Dual-liquid grouting is particularly effective in rapidly plugging strata with high groundwater velocity and flow.

[0003] At present, the dual-liquid grouting devices commonly used in China are mostly hole mixing or mixing in the hole by inserting a separate grouting pipe into the hole to close the hole. This method is only suitable for shallow drilling. For deep drilling, there are the following problems:

[0004] 1. Poor grouting targeting: When the grouting pipe is lowered over a long distance, it is affected by factors such as formation resistance and bending deformation, resulting in the grouting pipe being unable to reach the target formation;

[0005] 2. Uncontrollable slurry setting time: Since the slurry cannot be mixed in the treatment area (double-liquid slurry sets quickly), the long transportation distance of the mixed slurry is prone to clogging the borehole, resulting in grouting interruption, affecting the grouting effect and reducing the grouting efficiency;

[0006] 3. Unable to separate the hole sections: After the grouting is completed, the grouting pipe in the hole is solidified by the slurry, which increases the workload and difficulty of the hole cleaning operation.

[0007] Therefore, it is more important to provide a dual-liquid slurry segmented grouting device that can effectively separate the hole sections and at the same time make the slurry setting time controllable. Utility Model Content

[0008] In view of this, the utility model proposes a triple-tube double-liquid grouting plug and a grouting device, aiming to solve the problems existing in the prior art.

[0009] Specifically, the utility model provides a triple-tube double-liquid grouting plug, a triple-tube assembly, wherein the triple-tube assembly includes an outer tube, a middle tube, and an inner tube arranged coaxially;

[0010] a triple pipe joint at one end of the triple pipe assembly for connecting the triple pipe assembly;

[0011] A conversion joint for connecting a grouting plug assembly is provided at one end of the triple pipe joint away from the triple pipe assembly;

[0012] A grouting plug assembly for separating hole sections is arranged at one end of the conversion joint away from the triple pipe joint, and a water tap joint assembly for respectively connecting grouting equipment and a water pressure pump / air compressor is arranged at one end of the triple pipe assembly away from the triple pipe joint.

[0013] On the basis of the above solution, the triple tube assembly further comprises: a combined spline sleeve provided between the outer tube, the middle tube and the inner tube for isolation, fixation and support.

[0014] Based on the above scheme, the grouting plug assembly includes an upper pressure cover connected to the conversion joint, a rubber cylinder arranged on the upper pressure cover and connected to the middle pipe for generating radial expansion through the input expansion medium to separate the hole sections, and a lower pressure cover connected to the other end of the rubber cylinder for axially limiting the rubber cylinder.

[0015] On the basis of the above solution, the grouting plug assembly further includes: a guide cap provided on the lower gland for protection and guidance.

[0016] On the basis of the above solution, the diameters of the upper and lower glands are both larger than the diameter of the rubber cylinder, wherein alloy blocks are embedded in the upper and lower glands.

[0017] Based on the above scheme, the faucet joint assembly includes a first joint for conveying water glass arranged at the input end of the inner tube, a second joint for conveying cement slurry arranged at the input end of the middle tube, and a third joint for conveying pressurized air or pressurized water arranged at the input end of the outer tube.

[0018] On the basis of the above solution, it further comprises: a slurry outlet box provided at the slurry outlet end of the middle pipe for realizing a single flow direction of the slurry.

[0019] Based on the above scheme, the slurry discharge box includes a rubber sleeve mounted on the middle tube, a slurry discharge groove provided on the middle tube and covered by the rubber sleeve for spraying slurry so that the rubber sleeve is lifted to form an annular gap, and a blocking plate provided at the end of the middle tube for sealing the slurry discharge port of the middle tube.

[0020] On the basis of the above solution, it further includes: a one-way valve connected to the inner tube and provided on the slurry outlet end of the inner tube.

[0021] In addition, the utility model also provides a grouting device, including a grouting device for delivering cement slurry or water glass, a hydraulic pump / air compressor for delivering pressurized air or pressurized water, and the triple-tube double-liquid grouting plug connected to the grouting equipment and the hydraulic pump / air compressor.

[0022] Compared with existing devices, the present invention has a low rate of accidents during lowering and retrieval, stable setting and unsealing performance, and effectively separates borehole sections, thereby reducing borehole sweeping workload and operational difficulty. The slurry setting time is controllable, effectively preventing ineffective slurry diffusion, thereby saving grouting materials. Grouting is precisely targeted and can quickly seal water-rich formations with high groundwater flow rates and flow rates. Furthermore, the components and parts of the present invention are easy to purchase and assemble, resulting in low production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 This is a schematic structural diagram of a triple-tube double-liquid grouting plug in Example 1 of the present utility model;

[0025] Figure 2 This is a schematic structural diagram of the conversion joint in Example 1 of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of the triple pipe joint in Example 1 of the present utility model;

[0027] Figure 4 This is a cross-sectional view taken along line AA in Example 1 of the present invention (showing a combined spline sleeve);

[0028] Figure 5 This is a schematic structural diagram of the pulp box in Example 1 of the present utility model;

[0029] Figure 6 This is a schematic structural diagram of the one-way valve in Example 1 of the present utility model;

[0030] Figure 7 This is a schematic diagram of the assembly state of the faucet joint assembly and the triple pipe assembly in Example 1 of the present utility model;

[0031] Figure 8 This is a schematic diagram of the lowering process of the grouting device in Example 3 of the present utility model;

[0032] Figure 9 This is a schematic diagram of the process of separating hole segments in Example 3 of the present utility model;

[0033] Figure 10 This is a schematic diagram of the double-liquid grouting process in Example 3 of the present utility model. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] Example 1

[0036] like Figure 1-Figure 2 As shown, the present application provides a specific embodiment of a triple-tube dual-liquid grouting plug, including:

[0037] Triple tube assembly 2;

[0038] A triple pipe joint 3 for connecting the triple pipe assembly 2 at one end of the triple pipe assembly 2;

[0039] A conversion joint 4 for connecting a grouting plug assembly 5 is provided at one end of the triple pipe joint 3 away from the triple pipe assembly 2;

[0040] A grouting plug assembly 5 for separating hole sections is provided at one end of the conversion joint 4 away from the triple pipe joint 3;

[0041] and

[0042] A faucet joint assembly 1 for connecting a grouting device and a glue injection device is provided at one end of the triple pipe assembly 2 away from the triple pipe joint 3 .

[0043] As mentioned above, the grouting equipment includes equipment for pouring cement slurry and water glass, and the two slurry materials may use two equipment of the same model and specifications.

[0044] Specifically, the triple tube assembly 2 includes a coaxially arranged outer tube 2-1, a middle tube 2-2 and an inner tube 2-3. The outer tube 2-1 is connected to the triple tube joint 3 by threaded connection, and the middle tube 2-2 and the inner tube 2-3 are connected by socket connection.

[0045] like Figure 3-Figure 4 As shown in the figure, as a specific embodiment, the triple tube assembly 2 further includes: a combined spline sleeve 2-4 disposed between the outer tube 2-1, the middle tube 2-2, and the inner tube 2-3 for isolating, fixing, and supporting the outer tube 2-1, the middle tube 2-2, and the inner tube 2-3. To further improve sealing performance, the assembly further includes: a plurality of O-rings 3-2 disposed at the interfaces of the outer tube 2-1, the middle tube 2-2, and the inner tube 2-3.

[0046] As a specific embodiment, the grouting plug assembly 5 includes an upper gland 5-1 connected to the conversion joint 4, a rubber sleeve 5-2 disposed on the upper gland 5-1 and communicating with the middle tube 2-2, and a lower gland 5-3 connected to the other end of the rubber sleeve 5-2 for axially limiting the rubber sleeve 5-2. Specifically, the upper gland 5-1 is connected to the middle tube 2-2 using a threaded connection.

[0047] The grouting plug assembly 5 also includes a guide cap 5-4 provided on the lower gland 5-3 for protection and guidance. The guide cap 5-4 serves to guide and protect the middle tube 2-2 and inner tube 2-3 within the lower end of the rubber sleeve 5-2 during the lowering of the grouting plug. The guide cap 5-4 is welded to the lower gland 5-3 and serves to protect the slurry box 6 and the one-way valve 7. Specifically, the rubber sleeve 5-2 is a hollow cylinder that passes into the middle tube 2-2. The lower gland 5-3 is mounted on the lower end of the rubber sleeve 5-2, and the lower end of the lower gland 5-3 is welded to the guide cap 5-4. The rubber sleeve 5-2 is fixed and sealed by the upper gland 5-1 and the lower gland 5-3, limiting the axial displacement of the rubber sleeve 5-2. The rubber sleeve 5-2 forms a tubular body with an open upper end and a closed lower end.

[0048] In order to protect the rubber cylinder 5-2 from being damaged due to contact with the hole wall during the lowering process, the diameters of the upper pressure cover 5-1 and the lower pressure cover 5-3 are both larger than the diameter of the rubber cylinder 5-2, and the carcasses of the upper pressure cover 5-1 and the lower pressure cover 5-3 (i.e. the outer walls of the upper pressure cover 5-1 and the lower pressure cover 5-3) are inlaid with alloy blocks, and the diameter after inlaying is larger than the diameter of the rubber cylinder 5-2. Its functions are: 1. supporting the grouting plug to avoid contact between the rubber cylinder and the hole wall when lowering, and 2. cutting, twisting, and squeezing the live rocks and probe stones in the hole (obstacle clearance) to ensure the safety of lowering and recovering the grouting plug.

[0049] In order to prevent the slurry from flowing back: that is, during the grouting process or after the grouting is completed, to prevent the slurry from flowing back into the grouting pipe and causing a "pipe solidification accident", as a specific implementation plan, such as Figure 5 As shown, it also includes: a slurry box 6 provided at the slurry outlet end of the middle pipe 2-2 for realizing a single flow of slurry. Specifically, the slurry box 6 includes a rubber sleeve 6-1 sleeved on the middle pipe 2-2, a slurry outlet groove 6-2 provided on the middle pipe 2-2 and covered by the rubber sleeve 6-1 for spraying slurry so that the rubber sleeve 6-1 is lifted to form an annular gap, and a plugging plate 6-3 provided at the end of the middle pipe 2-2 for blocking the slurry outlet of the middle pipe 2-2.

[0050] The working process of the slurry box 6: After the cement slurry reaches the slurry outlet end of the middle pipe 2-2, it opens the rubber sleeve 6-1 through the slurry outlet groove 6-2 and flows out from the annular gap between the middle pipe 2-2 and the rubber sleeve 6-1. After the grouting pump is depressurized, the rubber sleeve 6-1 returns to its original state and the slurry outlet groove 6-2 is closed.

[0051] As a specific implementation scheme, Figure 6 As shown, it also includes: a one-way valve 7 provided on the slurry outlet end of the inner tube 2-3 and communicating with the inner tube 2-3. Specifically, the one-way valve 7 includes a valve body 7-1, a valve core 7-2 provided in the valve body 7-1, and a spring 7-3 provided on the valve core 7-2.

[0052] The working process of the one-way valve 7: After the water glass reaches the slurry outlet end of the inner tube 2-3, it pushes the valve core 7-2, causing the valve core 7-2 to move to the open position and compressing the spring 7-3 at the same time. After the grouting pump is depressurized, 7-3 restores the elastic force and pushes the valve core 7-2 to move to the closed position.

[0053] like Figure 7 As shown, as a specific embodiment, the faucet joint assembly 1 includes a first joint 1-1 for conveying water glass arranged at the input end of the inner tube 2-3, a second joint 1-2 for conveying cement slurry arranged at the input end of the middle tube 2-2, and a third joint 1-3 for conveying pressurized air or pressurized water arranged at the input end of the outer tube 2-1.

[0054] In order to observe the pressure maintaining condition of the grouting plug assembly 5, as shown in Figure 1 As shown, the apparatus further includes: a pressure gauge 1-4 provided on the third joint 1-3 and a control valve 1-5 for controlling the opening and closing of the outer tube 2-1. During use, after the grouting plug assembly 5 is inflated, the control valve 1-5 of the third joint 1-3 is closed, and the pressure maintenance of the grouting plug assembly 5 is monitored using the pressure gauge 1-4 installed at the valve. If pressure relief occurs, pressure is immediately replenished. If pressure replenishment is ineffective, the borehole must be removed for inspection.

[0055] Example 2

[0056] A grouting device adopts the grouting plug of Example 1, comprising a grouting device for delivering cement slurry or water glass, a hydraulic pump / air compressor for delivering pressurized air or pressurized water, and the triple-tube double-liquid grouting plug connected to the grouting device and the hydraulic pump / air compressor.

[0057] The above-mentioned grouting device of the present invention is sent to the predetermined position of the drill hole, and pressurized air or pressurized water is filled into the interface of the third joint 1-3. The pressurized air or pressurized water enters the annular gap between the rubber sleeve 5-2 and the middle pipe 2-2 through the outer pipe 2-1, causing the rubber sleeve 5-2 to expand radially, thereby realizing the function of separating the hole sections; then the cement slurry and water glass pipelines are connected to the second joint 1-2 and the first joint 1-1 respectively, and the cement slurry and water glass are transported to the receiving hole section through the middle pipe 2-2 and the inner pipe 2-3 of the triple pipe, thereby realizing the separate transportation of the double liquid slurry in the pipe and the mixed injection outside the pipe.

[0058] Example 3

[0059] This embodiment provides a specific triple-tube dual-liquid grouting method based on the triple-tube dual-liquid grouting plug in Example 1 and the grouting device in Example 2, including the following steps:

[0060] 1. Lower the grouting plug: Figure 8 As shown, the first section of the triple tube assembly 2 and the grouting plug assembly 5 are assembled and firmly connected, and then the combined device is installed on the drilling rig. Relying on the power pushing function of the drilling rig, the first section of the triple tube assembly 2 is pushed to the predetermined position, the drilling rig is removed, and the subsequent triple tube assembly 2 is added. The above steps are repeated until the grouting device is sent to the predetermined position of the drill hole; this operation process is the same as the drilling and rod adding operation;

[0061] Because the medium pipe and double liquid pipe adopt triple tube (replacing the previous method of setting the medium pipe and slurry pipe separately, and changing the rubber medium pipe to a metal pipe), the risk of damage caused by squeezing, congestion, twisting, cutting by sharp objects and excessive stretching during the lowering and recovery of the medium pipe is avoided; in addition, the diameter of the upper and lower glands is larger than that of the rubber cylinder, and the gland body is embedded with alloy blocks to prevent the rubber cylinder from contacting the hole wall during lowering and recovery. At the same time, it also has an obstacle clearing function, effectively ensuring the safety and smoothness of the grouting device during the lowering and recovery process;

[0062] 2. Realize the separation of hole segments: such as Figure 9 As shown, after the grouting plug assembly 5 is delivered to the predetermined position of the drill hole, pressurized air or pressurized water is filled into the third joint 1-3. The pressurized air or pressurized water enters the annular gap between the rubber sleeve 5-2 and the middle pipe 2-2 through the outer tube 2-1, causing the rubber sleeve 5-2 to expand radially, thereby achieving the function of separating the hole sections.

[0063] 3. Double liquid grouting: Figure 10 As shown, the cement slurry and water glass pipelines are connected to the second joint 1-2 and the first joint 1-1 respectively. The cement slurry is transported to the receiving section through the middle pipe 2-2 and the water glass is transported to the inner pipe 2-3 for mixing and then perfusion. This realizes the separate transportation of the double slurry in the pipe and the mixed perfusion outside the pipe.

[0064] 4. Unsealing the grouting plug: After grouting is completed, the control valve 1-5 of the outer tube 2-1 is opened to discharge the expansion medium in the rubber sleeve 5-2, causing the rubber sleeve 5-2 to shrink and return to its original state, and then the grouting plug in Example 1 is removed;

[0065] The above-mentioned expansion medium is preferably compressed air, because air is easier to release and the grouting plug unsealing performance is safer and more stable.

[0066] 5. Prevent slurry from flowing back: During or after the grouting process, prevent the slurry from flowing back into the grouting pipe. The slurry box 6 works. After the cement slurry reaches the slurry outlet end of the middle pipe 2-2, it opens the rubber sleeve 6-1 through the slurry outlet groove 6-2 and flows out from the annular gap between the middle pipe 2-2 and the rubber sleeve 6-1. After the grouting pump is depressurized, the rubber sleeve 6-1 returns to its original state and the slurry outlet groove 6-2 is closed.

[0067] 6. Working process of the one-way valve: After the water glass reaches the slurry outlet end of the inner tube 2-3, it pushes the valve core 7-2, causing the valve core 7-2 to move to the open position and compressing the spring 7-3 at the same time. After the grouting pump is depressurized, 7-3 restores its elastic force and pushes the valve core 7-2 to the closed position.

[0068] By using the device and method of the present embodiment, during the actual construction process, cement-water glass double-liquid slurry or A and B solution-type chemical slurries are poured into the poor strata according to the grouting needs; the grouting device of the utility model has a low rate of accidents in lowering and recovering, stable sealing and unsealing performance, can effectively separate the hole sections, thereby reducing the workload of hole sweeping and lowering the difficulty of operation, the slurry coagulation time is controllable, and the ineffective diffusion of the slurry is effectively prevented, thereby saving grouting materials, and the grouting is precisely targeted, and can quickly seal water-rich strata with large groundwater flow rate and flow.

[0069] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A triple-tube double-liquid grouting plug, characterized by: include: A triple tube assembly (2), the triple tube assembly (2) comprising an outer tube (2-1), a middle tube (2-2), and an inner tube (2-3) that are coaxially arranged; A triple pipe joint (3) for connecting the triple pipe assembly (2) at one end of the triple pipe assembly (2); A conversion joint (4) for connecting to a grouting plug assembly (5) is provided at one end of the triple pipe joint (3) away from the triple pipe assembly (2); A grouting plug assembly (5) for separating hole sections, arranged at one end of the conversion joint (4) away from the triple pipe joint (3), and a water tap joint assembly (1) for respectively connecting grouting equipment and a water pressure pump / air compressor, arranged at one end of the triple pipe assembly (2) away from the triple pipe joint (3).

2. The triple-tube double-liquid grouting plug according to claim 1, characterized in that: The triple tube assembly (2) further comprises a combined spline sleeve (2-4) for isolation, fixation and support, which is arranged between the outer tube (2-1), the middle tube (2-2) and the inner tube (2-3).

3. The triple-tube double-liquid grouting plug according to claim 1, characterized in that: The grouting plug assembly (5) comprises an upper gland (5-1) connected to a conversion joint (4), a rubber tube (5-2) provided on the upper gland (5-1) and in communication with a middle pipe (2-2) for generating radial expansion by input expansion medium to separate hole sections, and a lower gland (5-3) connected to the other end of the rubber tube (5-2) for axially limiting the rubber tube (5-2).

4. The triple-tube double-liquid grouting plug according to claim 3, characterized in that: The grouting plug assembly (5) further comprises a guide cap (5-4) provided on the lower gland (5-3) for protection and guidance.

5. The triple-tube double-liquid grouting plug according to claim 2, characterized in that: The faucet joint assembly (1) comprises a first joint (1-1) provided at the input end of the inner tube (2-3) for conveying water glass, a second joint (1-2) provided at the input end of the middle tube (2-2) for conveying cement slurry, and a third joint (1-3) provided at the input end of the outer tube (2-1) for conveying pressurized air or pressurized water.

6. The triple-tube double-liquid grouting plug according to claim 1, characterized in that: Also includes: A slurry discharge box (6) is provided at the slurry discharge end of the middle tube (2-2) for realizing a single flow direction of the slurry.

7. The triple-tube double-liquid grouting plug according to claim 6, characterized in that: Also includes: The slurry discharge box (6) comprises a rubber sleeve (6-1) sleeved on the middle tube (2-2), a slurry discharge groove (6-2) provided on the middle tube (2-2) and covered by the rubber sleeve (6-1) for spraying slurry so that the rubber sleeve (6-1) is lifted to form an annular gap, and a blocking plate (6-3) provided at the end of the middle tube (2-2) for blocking the slurry discharge port of the middle tube (2-2).

8. The triple-tube double-liquid grouting plug according to claim 1, characterized in that: Also includes: A one-way valve (7) is provided on the pulp outlet end of the inner tube (2-3) and is in communication with the inner tube (2-3).

9. The triple-tube double-liquid grouting plug according to claim 1, characterized in that: Also includes: A plurality of O-type sealing rings (3-2) are arranged at the interfaces of the outer tube (2-1), the middle tube (2-2) and the inner tube (2-3).

10. A grouting device, characterized in that: The invention comprises a grouting device for delivering cement slurry or water glass, a hydraulic pump / air compressor for delivering pressurized air or pressurized water, and a triple-tube double-liquid grouting plug according to any one of claims 1 to 9 connected to the grouting device and the hydraulic pump / air compressor.

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