Plugging device and grouting construction method

Abstract

The present invention discloses a plugging device and a grouting construction method, wherein the plugging device includes a first bladder and a second bladder, a fluid pipe, a control module, and a fluid source; the first bladder is arranged on the second bladder; one end of the fluid pipe is connected to the fluid source, and the other end is connected to the first bladder and the second bladder respectively; a first valve and a second valve are provided on the fluid pipe; the control module controls the operation of the fluid source, the first valve, and the second valve, so that the fluid fills the first bladder and / or the second bladder, or discharges the fluid from the first bladder and / or the second bladder, thereby achieving effective plugging during grouting. Before grouting in a broken area, the present invention expands the first bladder and the second bladder to achieve double-layer plugging, thereby achieving effective sealing before grouting in the broken area, solving the problem that traditional grouting plugs cannot effectively seal in broken areas.

Description

Technical Field

[0001] The invention belongs to the technical field of construction grouting, and in particular relates to a blocking device and a grouting construction method. Background Art

[0002] Grouting is commonly used to improve the permeability of rock and soil in environmental protection projects such as curtain grouting and dam grouting. During construction, effectively sealing the drilled holes with grout plugs prevents grout from overflowing, thereby effectively improving the rock and soil's impermeability and reducing its permeability.

[0003] Currently, commonly used grout plugs are mainly mechanical and hydraulic expansion types. For example, the expansion grout plug disclosed in patent application publication number CN114837713A, entitled "An Expansion Grout Plug for Grouting Anchors and Method of Use thereof," and the grouting device disclosed in patent authorization publication number CN218093053U, entitled "An Expansion Grouting Stop Device." These two types of grout plugs are effective for grouting in conventional, intact underground areas. However, when encountering areas with broken, loose, or low-strength borehole walls, traditional grout plugs cannot effectively seal the borehole, seriously affecting the quality of grouting. Summary of the Invention

[0004] The purpose of the present invention is to provide a sealing device and a grouting construction method to solve the problem that traditional grouting plugs cannot effectively seal in broken areas, resulting in poor grouting quality.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions: a blocking device comprising a capsule, a fluid tube, a control module, and a fluid source; the capsule comprises a first capsule and a second capsule, the first capsule being disposed on the second capsule; one end of the fluid tube is connected to the fluid source, and the other end is connected to the first capsule and the second capsule respectively; the fluid tube is provided with a first valve for controlling the flow of fluid into and out of the first capsule, and a second valve for controlling the flow of fluid into and out of the second capsule;

[0006] The control module is electrically connected to the fluid source, the first valve, and the second valve respectively; the control module is used to control the operation of the fluid source, the first valve, and the second valve, so that the fluid fills the first capsule and / or the second capsule, or discharges the fluid from the first capsule and / or the second capsule;

[0007] When the first sac is filled with fluid, the width of the upper portion of the first sac is greater than the width of the lower portion of the first sac, wherein the upper portion of the first sac refers to an end away from the second sac, and the lower portion of the first sac refers to an end close to the second sac;

[0008] When the second capsule is filled with fluid, the width of the upper part of the second capsule is smaller than the width of the lower part of the second capsule, where the upper part of the second capsule refers to the end close to the first capsule, and the lower part of the second capsule refers to the end away from the first capsule.

[0009] Furthermore, when the first and second bladders are filled with fluid, the width of the upper portion of the first bladder is equal to the width of the lower portion of the second bladder.

[0010] Furthermore, the fluid is gas or liquid.

[0011] Based on the same concept, the present invention also provides a grouting construction method, which comprises the following steps:

[0012] Step 1: Drilling a first grouting borehole in the area to be grouting; wherein the depth of the first grouting borehole is equal to the depth of the first grouting section, and the first grouting section is the strata on both sides of the first grouting borehole;

[0013] Step 2: placing the grouting device and the plugging device described above in the first grouting borehole, controlling the fluid source to fill the first and / or second bladders with fluid to expand the first and / or second bladders, thereby achieving plugging before grouting in the first grouting section;

[0014] Step 3: Grouting the first grouting section using a grouting device according to a predetermined grouting pressure;

[0015] Step 4: After the grouting is completed, the fluid in the first bladder and / or the second bladder is controlled to be discharged, and then the grouting device and the plugging device are removed;

[0016] Step 5: Continue drilling at the first grouting borehole to form a second grouting borehole; wherein the second grouting borehole does not include the first grouting borehole, the depth of the second grouting borehole is equal to the depth of the second grouting section, and the second grouting section is the strata on both sides of the second grouting borehole;

[0017] Step 6: placing the grouting device and the plugging device in the second grouting borehole, controlling the fluid source to fill the first and / or second bladders with fluid to expand the first and / or second bladders, thereby achieving plugging before grouting in the second grouting section;

[0018] Step 7: Grouting the first grouting section and the second grouting section using a grouting device according to a predetermined grouting pressure;

[0019] Step 8: After the grouting is completed, the fluid in the first bladder and / or the second bladder is controlled to be discharged, and then the grouting device and the plugging device are removed;

[0020] Step 9: Repeat steps 5 to 9 to complete grouting of all grouting sections from top to bottom.

[0021] Furthermore, the depth of each grouting section is equal.

[0022] Furthermore, the depth of the grouting section is 5 to 10 m.

[0023] Furthermore, during plugging, the plugging device is located at the top of the corresponding grouting borehole, so that the plugging section is shorter and the grouting efficiency is higher.

[0024] Furthermore, the filling fluid in the first capsule and / or the second capsule is determined according to the topography of the grouting section, specifically:

[0025] When the landform of the grouting section is miscellaneous fill, the fluid is high-density water; wherein the high density means that the density is greater than 1.5 times the density of water, and the high-density water is made by adding a solvent to water;

[0026] When the topography of the grouting section is silty clay, the fluid is medium-density water; wherein the medium-density refers to a density greater than the density of water and less than or equal to 1.5 times the density of water;

[0027] When the topography of the grouting section is strongly weathered rock, the fluid is water;

[0028] When the topography of the grouting section is moderately weathered rock or weakly weathered rock, the fluid is air.

[0029] Preferably, the solvent is soil.

[0030] Furthermore, for different grouting sections, the calculation formula for the predetermined grouting pressure is:

[0031]

[0032] in, is the predetermined grouting pressure of the nth grouting section, is the predetermined grouting pressure of the first grouting stage, is the formation correction factor.

[0033] Beneficial effects

[0034] Compared with the prior art, the advantages of the present invention are:

[0035] The present invention provides a sealing device and a grouting construction method, wherein the sealing device includes a first bladder and a second bladder arranged up and down. Before grouting in a complete underground area, effective sealing can be achieved by controlling the expansion of the first bladder and / or the second bladder, thereby ensuring the grouting quality and effectiveness. Before grouting in a broken area, the expansion of the first bladder and the second bladder is controlled, and effective sealing of the broken area before grouting is achieved through double-layer sealing, thereby solving the problem that traditional grouting plugs cannot effectively seal broken areas.

[0036] The grouting construction method adopts a segmented grouting method, and when grouting the nth grouting segment, grouting is also performed on the first n-1 grouting segments at the same time, so that repeated grouting of the same grouting segment is achieved, which greatly improves the grouting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 Schematic diagram of the structure of the plugging device in the grouting borehole according to an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the structure of the capsule in an embodiment of the present invention.

[0040] Among them, 1-fluid source, 2-fluid pipe, 3-bladder, 31-first bladder, 32-second bladder, 4-area to be grouting, 5-hard cardboard laid on the ground, 6-first grouting borehole, 7-second grouting borehole, 8-third grouting borehole. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0042] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0043] like Figure 1 and 2 As shown, a blocking device provided by an embodiment of the present invention includes a capsule 3, a fluid tube 2, a control module and a fluid source 1; the capsule 3 includes a first capsule 31 and a second capsule 32, and the first capsule 31 is arranged on the second capsule 32; one end of the fluid tube 2 is connected to the fluid source 1, and the other end is connected to the first capsule 31 and the second capsule 32 respectively; a first valve for controlling the fluid to enter and exit the first capsule 31 and a second valve for controlling the fluid to enter and exit the second capsule 32 are provided on the fluid tube 2.

[0044] The control module is electrically connected to the fluid source 1, the first valve, and the second valve, respectively. The fluid source 1 is used to provide a source of fluid, and the control module is used to control the operation of the fluid source 1, the first valve, and the second valve, allowing the fluid to fill the first bladder 31 and / or the second bladder 32, or to drain the fluid from the first bladder 31 and / or the second bladder 32. When the first valve is open, the fluid is controlled to flow into or out of the first bladder 31; when the second valve is open, the fluid is controlled to flow into or out of the second bladder 32. Inflow and outflow control is achieved by controlling the positive and negative pressures.

[0045] When the first capsule 31 is filled with fluid, the width of the upper part of the first capsule 31 is greater than the width of the lower part of the first capsule 31, wherein the upper part of the first capsule 31 refers to the end away from the second capsule 32, and the lower part of the first capsule 31 refers to the end close to the second capsule 32; when the second capsule 32 is filled with fluid, the width of the upper part of the second capsule 32 is less than the width of the lower part of the second capsule 32, wherein the upper part of the second capsule 32 refers to the end close to the first capsule 31, and the lower part of the second capsule 32 refers to the end away from the first capsule 31.

[0046] For example, when the first capsule 31 is filled with fluid, the longitudinal section of the first capsule 31 is a trapezoid with a top side length greater than a bottom side length; when the second capsule 32 is filled with fluid, the longitudinal section of the second capsule 32 is a trapezoid with a top side length less than a bottom side length.

[0047] When the first and second bladders 31, 32 are fully filled with fluid, the width of the upper portion of the first bladder 31 may be equal to or unequal to the width of the lower portion of the second bladder 32. In this embodiment, when the first and second bladders 31, 32 are fully filled with fluid, the width of the upper portion of the first bladder 31 is equal to the width of the lower portion of the second bladder 32.

[0048] In a specific embodiment of the present invention, the fluid is gas or liquid, such as air, water, cement slurry, and the specific fluid type can be determined according to the topography of the grouting section during grouting, which can enhance the sealing effect.

[0049] Based on the same concept, an embodiment of the present invention further provides a grouting construction method, which includes the following steps:

[0050] Step 1: Drill a hole in the area to be grouting 4 to form a first grouting hole 6.

[0051] The present invention divides the area to be grouted 4 into multiple grouting sections from top to bottom, which are sequentially recorded as the first grouting section, the second grouting section, ..., the nth grouting section, ..., the Nth grouting section, and the depth of each grouting section is equal, N is the number of grouting sections, and N is equal to the depth of the area to be grouted 4 divided by the depth of a single grouting section. In this embodiment, the depth of each grouting section is 5~10m. For example, the depth of a single grouting section is 10m, and the depth of the area to be grouted 4 is 80m, then N=8, the first grouting section is 0~10m (the ground is 0m), the second grouting section is 10~20m, the third grouting section is 20~30m, ..., and the eighth grouting section is 70~80m.

[0052] The present invention adopts segmented grouting method, and the grouting holes correspond to the grouting sections. Figure 1 As shown, before grouting the first grouting section, a drilling rig is first used to drill a hole in the area to be grouting 4 to form a first grouting borehole 6. The first grouting borehole 6 corresponds to the first grouting section. The depth of the first grouting borehole 6 is equal to the depth of the first grouting section. The first grouting section is the strata on both sides of the first grouting borehole 6, that is, grouting is performed on the strata on both sides of the first grouting borehole 6 to improve the anti-permeability of the stratum and reduce the permeability of the stratum.

[0053] Step 2: Place the grouting device and the sealing device as described above in the first grouting borehole 6, control the fluid source 1 to fill the first capsule 31 and / or the second capsule 32 with fluid, so that the first capsule 31 and / or the second capsule 32 expands to achieve sealing before grouting in the first grouting section.

[0054] In this embodiment, the grouting device is a grouting rod, a conventional structure. To ensure that the grouting section can be sealed and grouting can be completed while also shortening the sealed section to improve grouting efficiency, the sealing device is placed at the top of the corresponding grouting borehole. Specifically, before grouting the first grouting section, the sealing device is placed at the top of the first grouting section. For example, if the first grouting section is 0 to 10 meters long, the first and second bladders 31 and 32 of the sealing device are placed at 0 meters to achieve sealing before grouting the first grouting section.

[0055] When the first grouting section is a complete underground area, the fluid is controlled to flow into the first capsule 31 and / or the second capsule 32 through the fluid pipe 2, so that the first capsule 31 and / or the second capsule 32 expand and squeeze into contact with the wall of the first grouting borehole 6, thereby achieving effective sealing; when the first grouting section is a broken area, the fluid is controlled to flow into the first capsule 31 and the second capsule 32 through the fluid pipe 2, so that the first capsule 31 and the second capsule 32 expand and squeeze into contact with the wall of the first grouting borehole 6, thereby achieving effective sealing through double-layer sealing.

[0056] In this embodiment, the positions of the first and second bladders 31 and 32 within the grouting borehole can be controlled by controlling the length of the fluid tube 2. To enhance the sealing effect, the fluid type can also be determined based on the stratum topography of the grouting section during grouting. The correspondence between different stratum topography and fluid type is shown in Table 1.

[0057] Table 1 Correspondence between formation landforms, fluid types, and correction coefficients

[0058]

[0059] In Table 1, high density refers to a density greater than 1.5 times that of water, and medium density refers to a density greater than but less than or equal to 1.5 times that of water. High-density water or medium-density water is produced by adding a solvent to water. The solvent can be soil or other substances with a density greater than that of water. High-density water and medium-density water are in a fluid state. To achieve a better sealing effect, different types of fluids are used in different grouting sections. Therefore, the grouting area 4 to be grouted can be segmented according to the stratum topography, so that each grouting section has the same topography as much as possible, so as to facilitate the determination of the fluid type corresponding to the topography.

[0060] Step 3: Use the grouting device to grout the first grouting section according to the predetermined grouting pressure.

[0061] The predetermined grouting pressure of the first grouting section can be determined based on experience or through experiments, which can improve the grouting efficiency while ensuring the grouting quality. The predetermined grouting pressure of other grouting sections can be calculated according to the following calculation formula:

[0062] (1)

[0063] in, is the predetermined grouting pressure of the nth grouting section, n=2,3,…,N, is the predetermined grouting pressure of the first grouting stage, is the formation correction coefficient (Table 1).

[0064] Step 4: After the grouting is completed, the fluid in the first bladder 31 and / or the second bladder 32 is controlled to be discharged, and then the grouting device and the plugging device are taken out.

[0065] After the grouting of the first grouting stage is completed, the fluid in the first bladder 31 and / or the second bladder 32 is discharged so that the grouting device and the plugging device can be removed, and then the first grouting borehole 6 is drilled to form the second grouting borehole 7.

[0066] Step 5: Continue drilling at the first grouting borehole 6 to form a second grouting borehole 7.

[0067] The second grouting borehole 7 does not include the first grouting borehole 6 . The second grouting borehole 7 corresponds to the second grouting section. The depth of the second grouting borehole 7 is equal to the depth of the second grouting section. The second grouting section is the strata on both sides of the second grouting borehole 7 .

[0068] Step 6: Place the grouting device and the sealing device as described above into the second grouting borehole 7, control the fluid source 1 to fill the first capsule 31 and / or the second capsule 32 with fluid, so that the first capsule 31 and / or the second capsule 32 expands to achieve sealing before grouting in the second grouting section.

[0069] To ensure both a closed grouting section and a shorter closed section for improved grouting efficiency, the sealing device is placed at the top of the corresponding grouting borehole. Specifically, before grouting the second grouting section, the sealing device is placed at the top of the second grouting section. For example, if the second grouting section is 10-20 meters long, the first and second bladders 31, 32 of the sealing device are placed at 10 meters to achieve sealing before grouting the second grouting section.

[0070] Step 7: According to the predetermined grouting pressure, grouting is performed into the first grouting section and the second grouting section using a grouting device.

[0071] According to formula (1), the predetermined grouting pressure when grouting the second grouting section can be calculated, which improves the grouting efficiency while ensuring the grouting quality. When the grouting device grouts the second grouting section, the slurry not only grouts or grouts the second grouting section, but also grouts the first grouting section because the strata of the first grouting section and the second grouting section are connected. This achieves repeated grouting of the first grouting section while grouting the second grouting section, thereby improving the grouting quality.

[0072] For example, if the first grouting section is 0-10m and the second grouting section is 10-20m, then when grouting the second grouting section, the actual grouting sections are the first and second grouting sections, and the first grouting section is repeatedly grouted. Similarly, when grouting the nth grouting section, the actual grouting sections are the first to nth grouting sections, and the first to n-1th grouting sections are repeatedly grouted.

[0073] Step 8: After the grouting is completed, the fluid in the first bladder 31 and / or the second bladder 32 is controlled to be discharged, and then the grouting device and the plugging device are taken out.

[0074] Repeat steps 5 to 8 until all grouting sections are completed. During the grouting process, the concentration of the grouting slurry remains unchanged.

[0075] The above disclosure is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, and they should all be covered by the scope of protection of the present invention.

Claims

1. A grouting construction method, characterized in that: The method comprises the following steps: Step 1: Drilling a first grouting borehole in the area to be grouting; wherein the depth of the first grouting borehole is equal to the depth of the first grouting section, and the first grouting section is the strata on both sides of the first grouting borehole; Step 2: Placing a grouting device and a plugging device in the first grouting borehole; wherein the plugging device includes a capsule, a fluid tube, a control module, and a fluid source; the capsule includes a first capsule and a second capsule, the first capsule being disposed on the second capsule; one end of the fluid tube is connected to the fluid source, and the other end is connected to the first capsule and the second capsule, respectively; the fluid tube is provided with a first valve for controlling fluid inflow and outflow from the first capsule, and a second valve for controlling fluid inflow and outflow from the second capsule; The control module is electrically connected to the fluid source, the first valve, and the second valve respectively; the control module is used to control the operation of the fluid source, the first valve, and the second valve, so that the fluid fills the first capsule and / or the second capsule, or discharges the fluid from the first capsule and / or the second capsule; When the first sac is filled with fluid, the width of the upper portion of the first sac is greater than the width of the lower portion of the first sac, wherein the upper portion of the first sac refers to an end away from the second sac, and the lower portion of the first sac refers to an end close to the second sac; When the second bladder is filled with fluid, the width of the upper portion of the second bladder is smaller than the width of the lower portion of the second bladder, wherein the upper portion of the second bladder refers to an end close to the first bladder, and the lower portion of the second bladder refers to an end away from the first bladder; Controlling the fluid source to fill the first bladder and / or the second bladder with fluid to expand the first bladder and / or the second bladder to achieve plugging before grouting in the first grouting stage; Step 3: Grouting the first grouting section using a grouting device according to a predetermined grouting pressure; Step 4: After the grouting is completed, the fluid in the first bladder and / or the second bladder is controlled to be discharged, and then the grouting device and the plugging device are removed; Step 5: Continue drilling at the first grouting borehole to form a second grouting borehole; wherein the second grouting borehole does not include the first grouting borehole, the depth of the second grouting borehole is equal to the depth of the second grouting section, and the second grouting section is the strata on both sides of the second grouting borehole; Step 6: placing the grouting device and the plugging device in the second grouting borehole, controlling the fluid source to fill the first and / or second bladders with fluid to expand the first and / or second bladders, thereby achieving plugging before grouting in the second grouting section; Step 7: Grouting the first grouting section and the second grouting section using a grouting device according to a predetermined grouting pressure; Step 8: After the grouting is completed, the fluid in the first bladder and / or the second bladder is controlled to be discharged, and then the grouting device and the plugging device are removed; Step 9: Repeat steps 5-9 to complete grouting of all grouting sections from top to bottom.

2. The grouting construction method according to claim 1, wherein: When the first and second bladders are filled with fluid, the width of the upper portion of the first bladder is equal to the width of the lower portion of the second bladder.

3. The grouting construction method according to claim 1, wherein: The fluid is gas or liquid.

4. The grouting construction method according to claim 1, wherein: The depth of each grouting section is equal.

5. The grouting construction method according to claim 4, wherein: The depth of the grouting section is 5-10m.

6. The grouting construction method according to claim 1, wherein: During plugging, the plugging device is located at the top of the corresponding grouting borehole.

7. The grouting construction method according to any one of claims 1 to 6, characterized in that: The filling fluid in the first and / or second bladder is determined according to the topography of the grouting section, specifically: When the landform of the grouting section is miscellaneous fill, the fluid is high-density water; wherein the high density means that the density is greater than 1.5 times the density of water, and the high-density water is made by adding a solvent to water; When the topography of the grouting section is silty clay, the fluid is medium-density water; wherein the medium-density refers to a density greater than the density of water and less than or equal to 1.5 times the density of water; When the landform of the grouting section is strongly weathered rock, the fluid is water; when the landform of the grouting section is moderately weathered rock or weakly weathered rock, the fluid is air.

8. The grouting construction method according to claim 7, characterized in that: The solvent is soil.

9. The grouting construction method according to any one of claims 1 to 6, characterized in that: For different grouting sections, the calculation formula for the predetermined grouting pressure is: in, is the predetermined grouting pressure of the nth grouting section, is the predetermined grouting pressure of the first grouting stage, is the formation correction factor.

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