Double-slurry sectional type grouting device and grouting method based on triple pipe

Abstract

The invention relates to the field of grouting construction research, in particular to a double-slurry sectional type grouting device and method based on a triple pipe, and the device 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 lowering 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 lowered, the grout setting time is controllable, invalid diffusion of grout 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 used in cooperation with other components, in-pipe separated conveying and out-pipe mixed pouring of the double-liquid slurry can be achieved, and the risks that after the double-liquid slurry is mixed in the pipe, the double-liquid slurry can be rapidly solidified to block a grouting pipeline, and damage is caused by extrusion, congestion, excessive stretching and the like in the lowering and recycling process are avoided.

Description

Technical Field

[0001] The invention belongs to the field of grouting construction, and in particular relates to a double-liquid slurry segmented grouting device and a grouting method based on a triple tube. Background Art

[0002] The dual-liquid slurry segmented grouting device is mainly used in the fields of water conservancy and hydropower, highways, railways, municipal engineering, mining engineering, etc., for the controlled grouting of unfavorable strata such as goafs, caves, fault zones, and fissure zones to reinforce and plug water. The grouting types mainly include advanced pre-grouting, post-wall grouting, filling grouting, and dynamic water grouting, etc. In particular, the dual-liquid grouting in strata with large groundwater velocity and flow can achieve the purpose of rapid water plugging.

[0003] At present, the double-liquid grouting devices commonly used in China are mostly hole-mouth mixing or mixing in the hole with a separate grouting pipe at the hole mouth. 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. The slurry coagulation time is uncontrollable: Since the slurry cannot be mixed in the treatment area (the double liquid slurry coagulates quickly), the mixed slurry is easily blocked by the long transportation distance, resulting in grouting interruption, affecting the grouting effect and reducing the grouting efficiency;

[0006] 3. Failure 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 make the slurry setting time controllable. Summary of the invention

[0008] Based on the problems existing in the prior art, the present invention proposes a double-liquid slurry segmented grouting device and a grouting method based on a triple tube.

[0009] Specifically, the double-liquid slurry segmented grouting device based on a triple tube includes: a triple tube assembly, a triple tube joint for connecting the triple tube assembly at one end of the triple tube assembly, a conversion joint for connecting a grouting plug assembly arranged at an end of the triple tube joint away from the triple tube assembly, a grouting plug assembly for separating hole sections arranged at an end of the conversion joint away from the triple tube joint, and a swivel joint assembly for respectively connecting grouting equipment and a water pressure pump / air compressor arranged at an end of the triple tube assembly away from the triple tube joint.

[0010] On the basis of the above solution, the triple tube assembly comprises an outer tube, a middle tube and an inner tube which are coaxially arranged, and the outer tube is threadedly connected to the triple tube joint.

[0011] On the basis of the above solution, the triple tube assembly further comprises: a combined spline sleeve for isolation, fixation and support arranged between the outer tube, the middle tube and the inner tube.

[0012] 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.

[0013] On the basis of the above solution, the grouting plug assembly further comprises: a guide cap provided on the lower pressure cover for protection and guidance.

[0014] On the basis of the above scheme, the diameters of the upper pressure cover and the lower pressure cover are both larger than the diameter of the rubber cylinder, wherein the upper pressure cover and the lower pressure cover are both inlaid with alloy blocks.

[0015] 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.

[0016] On the basis of the above solution, it also includes: a slurry outlet box for realizing a single flow direction of slurry is arranged at the slurry outlet end of the middle tube.

[0017] On the basis of the above scheme, the slurry outlet box includes a rubber sleeve mounted on the middle tube, a slurry outlet groove arranged 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 plugging plate arranged at the end of the middle tube for sealing the slurry outlet of the middle tube.

[0018] On the basis of the above scheme, it also includes: a one-way valve connected to the inner tube and arranged on the slurry outlet end of the inner tube.

[0019] In addition, the present invention also provides a double-liquid slurry segmented grouting method based on a triple tube, which specifically includes:

[0020] S1: The grouting device is lowered to the borehole;

[0021] S2: Separating the hole sections: After the grouting plug assembly is sent to the predetermined position of the borehole, pressurized air or pressurized water is charged into the third joint, and the pressurized air or pressurized water enters the annular gap between the rubber tube and the middle tube through the outer tube, causing the rubber tube to expand radially;

[0022] S3: Double-liquid grouting: Cement slurry is introduced through the second joint, and water glass is introduced through the first joint. The cement slurry is transported through the middle pipe and the water glass is transported through the inner pipe to the receiving section for mixing and then poured;

[0023] S4: Unsealing the grouting plug: After the grouting is completed, open the control valve on the outer tube to discharge the expansion medium in the rubber tube, so that the rubber tube shrinks and returns to its original state;

[0024] S5: Propose a grouting device in the borehole.

[0025] Compared with the devices and methods of the existing technology, the device of the present invention has a low accident rate of lowering and recovery, stable sealing and unsealing performance, can effectively separate the hole sections, thereby reducing the workload of hole sweeping and reducing the difficulty of operation, and the slurry coagulation time is controllable, effectively preventing the ineffective diffusion of the slurry, thereby saving grouting materials, and the grouting targeting is accurate, and can quickly block the water-rich formation with large groundwater flow rate and flow. In addition, the components and parts contained in the grouting device of the present invention are easy to purchase and easy to assemble, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a double-liquid slurry segmented grouting device based on a triple tube in Example 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the conversion joint in Example 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a triple pipe joint in Example 1 of the present invention;

[0029] Figure 4 AA cross-sectional view of Example 1 of the present invention (showing a combined spline sleeve);

[0030] Figure 5 This is a schematic diagram of the structure of the pulp box in Example 1 of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the one-way valve in Example 1 of the present invention;

[0032] 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 invention;

[0033] Figure 8 This is a schematic diagram of the lowering process of the grouting device in Example 2 of the present invention;

[0034] Fig. 9 This is a schematic diagram of the process of separating hole segments in Example 2 of the present invention;

[0035] Fig.10Schematic diagram of the double-liquid grouting process in Example 2 of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention and do not have any limiting effect on the present invention.

[0037] Example 1

[0038] like Figure 1-Figure 2 As shown, the present invention provides a double-liquid slurry segmented grouting device based on a triple tube, comprising:

[0039] Triple tube assembly 2;

[0040] A triple pipe joint 3 for connecting the triple pipe assembly 2 at one end of the triple pipe assembly 2;

[0041] 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;

[0042] A grouting plug assembly 5 for separating hole sections is arranged at one end of the conversion joint 4 away from the triple pipe joint 3;

[0043] and

[0044] 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 .

[0045] 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 specification.

[0046] 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.

[0047] like Figure 3-Figure 4 As shown, as a specific embodiment, the triple tube assembly 2 also includes: a combined spline sleeve 2-4 for isolating, fixing and supporting the outer tube 2-1, the middle tube 2-2 and the inner tube 2-3, which is arranged between the outer tube 2-1, the middle tube 2-2 and the inner tube 2-3. In order to further improve the sealing performance, it also includes: a plurality of O-rings 3-2 are arranged at the interface of the outer tube 2-1, the middle tube 2-2 and the inner tube 2-3.

[0048] As a specific implementation scheme, the grouting plug assembly 5 includes an upper gland 5-1 connected to the conversion joint 4, a rubber tube 5-2 arranged on the upper gland 5-1 and connected to the middle tube 2-2, 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. Specifically, the upper gland 5-1 is connected to the middle tube 2-2 by threading.

[0049] The grouting plug assembly 5 also includes a guide cap 5-4 for protection and guidance, which is arranged on the lower pressure cover 5-3. The function of the guide cap 5-4 is to guide and protect the middle tube 2-2 and the inner tube 2-3 in the lower end of the rubber cylinder 5-2 during the lowering process of the grouting plug. The guide cap 5-4 is welded to the lower pressure cover 5-3, and the guide cap 5-4 plays the role of protecting the slurry box 6 and the one-way valve 7. Specifically, the rubber cylinder 5-2 is a hollow cylinder, which is inserted into the middle tube 2-2. The lower pressure cover 5-3 is installed at the lower end of the rubber cylinder 5-2, and the lower end of the lower pressure cover 5-3 is welded to the guide cap 5-4. The rubber cylinder 5-2 is fixed and sealed by the upper pressure cover 5-1 and the lower pressure cover 5-3 to limit the axial displacement of the rubber cylinder 5-2, and the rubber cylinder 5-2 forms a tubular body with an open upper end and a closed lower end.

[0050] 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 alloy blocks are embedded on 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). The diameter after embedding is larger than the diameter of the rubber cylinder 5-2. Its functions are: 1. to support the grouting plug to prevent the rubber cylinder from contacting the hole wall during lowering, and 2. to cut, twist, and squeeze the live rocks and probe stones in the hole (obstacle clearance) to ensure the safety of lowering and recovery of the grouting plug.

[0051] In order to prevent the slurry from flowing back: that is, after the grouting process or after the grouting is completed, prevent the slurry from flowing back into the grouting pipe and causing a "pipe solidification accident", as a specific implementation plan, Figure 5 As shown, it also includes: a slurry outlet box 6 for realizing a single flow of slurry, which is arranged at the slurry outlet end of the middle pipe 2-2. Specifically, the slurry outlet box 6 includes a rubber sleeve 6-1 sleeved on the middle pipe 2-2, a slurry outlet groove 6-2 arranged 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 arranged at the end of the middle pipe 2-2 for blocking the slurry outlet of the middle pipe 2-2.

[0052] 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 closes the slurry outlet groove 6-2.

[0053] As a specific implementation scheme, Figure 6 As shown, it also includes: a one-way valve 7 connected to the inner tube 2-3 and arranged on the pulp outlet end of the inner tube 2-3. Specifically, the one-way valve 7 includes a valve body 7-1, a valve core 7-2 arranged in the valve body 7-1, and a spring 7-3 arranged on the valve core 7-2.

[0054] 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 to move the valve core 7-2 to the open position and compresses 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 the closed position.

[0055] 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.

[0056] In order to observe the pressure maintenance condition of the grouting plug assembly 5, Figure 1 As shown, it also includes: a pressure gauge 1-4 arranged on the third joint 1-3 and a control valve 1-5 for controlling the opening and closing of the outer tube 2-1. When in 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 observed through the pressure gauge 1-4 installed at the valve. If there is a pressure relief phenomenon, the pressure is immediately supplemented. If the pressure supplementation is ineffective, the borehole needs to be taken out for inspection.

[0057] The above-mentioned grouting device of the present invention, after being sent to the predetermined position of the borehole, fills the third joint 1-3 interface with pressurized air or pressurized water, and 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 respectively connected to the second joint 1-2 and the first joint 1-1, 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 double liquid slurry in the pipe and the mixed injection outside the pipe.

[0058] Example 2

[0059] A double-liquid slurry segmented grouting method based on a triple tube, wherein the device used is the device in Example 1, and comprises the following steps:

[0060] 1. Lowering of grouting device: Figure 8As shown, the first section 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 triple tube assembly 2 is pushed to the predetermined position, the drilling rig is removed, and the subsequent triple tube assembly 2 is added. Repeat the above steps until the grouting device is sent to the predetermined position of the borehole; this operation process is the same as the drilling and rod adding operation;

[0061] Since the medium pipe and the double liquid pipe adopt triple pipe (instead of the previous method of setting the medium pipe and the slurry pipe separately, and the rubber medium pipe is changed to a metal pipe), the risk of damage caused by extrusion, 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 the diameter of the rubber cylinder, and the gland body is inlaid with alloy blocks to avoid contact between the rubber cylinder and 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. To achieve the separation of hole segments: Fig. 9 As shown, after the grouting plug assembly 5 is sent to the predetermined position of the borehole, pressurized air or pressurized water is filled into the third joint 1-3, and the pressurized air or pressurized water enters the annular gap between the rubber tube 5-2 and the middle tube 2-2 through the outer tube 2-1, so that the rubber tube 5-2 expands radially, realizing the function of separating the hole sections;

[0063] 3. Double liquid grouting: Fig.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, and 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, thus realizing the separate transportation of double slurry in the pipe and the mixed perfusion outside the pipe;

[0064] 4. Unsealing the grouting plug: After the grouting is completed, the control valve 1-5 of the outer tube 2-1 is opened to discharge the expansion medium in the rubber tube 5-2, so that the rubber tube 5-2 shrinks and returns to its original state, and the grouting device in Example 1 is proposed;

[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 the grouting process or after the grouting is completed, 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 closes the slurry outlet groove 6-2.

[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 to move the valve core 7-2 to the open position and compresses 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 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 slurry are injected into the poor strata according to the grouting needs; the grouting device of the present invention has a low lowering and recovery accident rate, stable sealing and unsealing performance, can effectively separate the hole sections, thereby reducing the workload of hole sweeping and reducing 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 targeted and accurate, and can quickly block the water-rich strata with large groundwater flow rate and flow.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A double-liquid slurry segmented grouting device based on a triple tube, characterized in that: include: Triple tube assembly (2); 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 a grouting plug assembly (5) is arranged 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 faucet joint assembly (1) for respectively connecting grouting equipment and a water pressure pump / air compressor is provided at one end of the triple pipe assembly (2) away from the triple pipe joint (3).

2. The triple-tube dual-liquid slurry segmented grouting device according to claim 1 is characterized in that: The triple pipe assembly (2) comprises an outer pipe (2-1), a middle pipe (2-2) and an inner pipe (2-3) which are coaxially arranged; the outer pipe (2-1) is threadedly connected to the triple pipe joint (3).

3. The triple-tube dual-liquid slurry segmented grouting device according to claim 2 is characterized in that: The triple tube assembly (2) further comprises: a combined spline sleeve (2-4) for isolation, fixing and supporting, which is arranged between the outer tube (2-1), the middle tube (2-2) and the inner tube (2-3).

4. The triple-tube dual-liquid slurry segmented grouting device according to claim 2 is characterized in that: The grouting plug assembly (5) comprises an upper pressure cover (5-1) connected to the conversion joint (4), a rubber tube (5-2) arranged on the upper pressure cover (5-1) and connected to the middle pipe (2-2) for generating radial expansion through input expansion medium to separate the hole sections, and a lower pressure cover (5-3) connected to the other end of the rubber tube (5-2) for axially limiting the rubber tube (5-2).

5. The triple-tube dual-liquid slurry segmented grouting device according to claim 4 is 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.

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

7. The triple-tube dual-liquid slurry segmented grouting device according to claim 2, characterized in that: Also includes: A slurry outlet box (6) is arranged at the slurry outlet end of the middle tube (2-2) to realize a single flow direction of the slurry.

8. The triple-tube dual-liquid slurry segmented grouting device according to claim 7, characterized in that: 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 up to form an annular gap, and a plugging plate (6-3) provided at the end of the middle tube (2-2) for sealing the slurry discharge port of the middle tube (2-2).

9. The triple-tube dual-liquid slurry segmented grouting device according to claim 2, characterized in that: Also includes: A one-way valve (7) connected to the inner tube (2-3) is arranged on the pulp outlet end of the inner tube (2-3).

10. A triple-tube dual-liquid slurry segmented grouting method, characterized in that: The grouting device according to any one of claims 1 to 9 is used, specifically comprising: S1: The grouting device is lowered to the borehole; S2: Separating the hole sections: After the grouting plug assembly (5) is sent to a predetermined position in the borehole, pressurized air or pressurized water is charged into the third joint (1-3), and 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; S3: Double liquid grouting: cement slurry is introduced through the second joint (1-2), water glass is introduced through the first joint (1-1), and the cement slurry is transported through the middle pipe (2-2) and the water glass is transported through the inner pipe (2-3) to the receiving section for mixing and injection; S4: Unsealing the grouting plug: After the grouting is completed, the control valve (1-5) on the outer tube (2-1) is opened to discharge the expansion medium in the rubber tube (5-2), so that the rubber tube (5-2) shrinks and returns to its original state; S5: Propose a grouting device in the borehole.

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