A point-sealing component and its preparation method

Abstract

This invention provides a point-sealing component and its preparation method. The point-sealing component includes a sealing element and a V-shaped clamp. The sealing element includes a first segment and a second segment connected to each other. The second segment has a cavity. The V-shaped clamp is opened and disposed in the cavity, with the opening of the V-shaped clamp facing away from the first segment. A counterweight is clamped inside the V-shaped clamp, and the counterweight is adapted to open the V-shaped clamp. The first segment includes a first material, a second material, and a third material. The second segment includes the first material and the second material. The first material is a water-swellable material, the second material is a water-soluble cementing material, and the third material is the counterweight. The preparation method of the aforementioned point-sealing component includes the following steps: using a mold to make the V-shaped clamp; mixing the raw materials of the first segment and pouring them into the mold for pressing and shaping; mixing the first material and the second material and continuing to pour them into the mold for pressing and shaping; placing the precast component into the cavity. This invention overcomes the defect of poor point-sealing effect when using cement grout injection.

Description

Technical Field

[0001] This invention relates to the technical field of in-situ injection, and specifically to a point-sealing component and its preparation method. Background Technology

[0002] In-situ injection technology is a commonly used implementation technique in soil and groundwater remediation. During the implementation of in-situ injection technology, a Geoprobe drilling rig is used to first drill to the designated injection depth, and then the chemical is delivered into the injection point. Due to the limitation of the chemical diffusion radius, the spacing between injection points is typically designed to be 0.3-1.5m. The injection time at each point is usually 20-60 minutes. After one point is injected, the next point is moved on to the next until all points are injected.

[0003] Due to the uneven distribution of underground soil layers, especially in areas with good permeability where groundwater is connected, slurry return of the agent often occurs at adjacent points during the injection process. If no point sealing measures are taken, the amount of slurry return at one point can reach more than 80% of the injected amount. Therefore, point sealing measures are necessary.

[0004] Common point sealing measures include installing prefabricated waterproof steel casings in the borehole and injecting cement grout. However, installing prefabricated waterproof steel casings is not feasible due to their high density and cost. The Geoprobe drill rod has a diameter of only 57mm, and the residual borehole diameter after injection is at most about 60mm, with a depth of over ten meters. The borehole wall is composed of soil with high water content and humidity, and contains several meters of groundwater. This makes it difficult to inject cement grout to the effective depth. Furthermore, point sealing measures are usually required after injection at one point before proceeding to the next, but the cement grout takes too long to harden, resulting in poor point sealing effectiveness. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that the existing method of injecting cement grout has poor sealing effect.

[0006] Therefore, the present invention provides a point-sealing component, comprising:

[0007] A closure component; the closure component includes a first section and a second section connected to each other; the second section has a cavity;

[0008] A V-shaped clamp is provided openly within a cavity, with the opening of the V-shaped clamp facing away from the first section; a counterweight is provided inside the V-shaped clamp, and the counterweight is adapted to open the V-shaped clamp.

[0009] The first segment includes a first material, a second material, and a third material; the second segment includes a first material and a second material; the first material is a water-swellable material, the second material is a cementing material, and the third material is a counterweight material.

[0010] Furthermore, the second section of the closure is provided with a placement opening, which communicates with the cavity; the placement opening is adapted to place the V-shaped clamp in the cavity.

[0011] Furthermore, the V-shaped clamp includes two side arms that are connected to each other to form a V-shaped groove. Each of the two opposite side arms of the V-shaped clamp is provided with a groove, and the bottoms of the two grooves are arranged opposite to each other. The grooves are adapted to abut against the side wall of the counterweight.

[0012] Furthermore, the second material is a water-soluble cementing material;

[0013] And / or, the mass ratio of the first material, the second material and the third material in the first segment is (1-3):(0.5-2):(2-5);

[0014] And / or, the mass ratio of the first material and the second material in the second paragraph is (2-4):(0.5-2).

[0015] Furthermore, the first material is bentonite;

[0016] And / or, the second material is polyvinyl alcohol;

[0017] And / or, the third material is iron powder.

[0018] Furthermore, the moisture content of the bentonite is ≤3%;

[0019] And / or, the degree of alcoholysis of the polyvinyl alcohol is not higher than 89%.

[0020] Furthermore, the counterweight is a spherical counterweight.

[0021] Further, by weight, the materials used to prepare the V-shaped clip include: 90-100 parts of plant fiber, 20-40 parts of polyvinyl alcohol, 10-20 parts of starch, and 5-10 parts of hydrogen peroxide.

[0022] Furthermore, the plant fibers include corn, wheat straw, and rice husks;

[0023] And / or, the starch is corn starch and / or potato starch.

[0024] The present invention also provides a method for preparing one of the aforementioned point-sealing components, comprising the following steps:

[0025] Use molds to make V-shaped clamps, and clamp the counterweights into the V-shaped clamps as prefabricated parts;

[0026] The first material, the second material, and the third material are mixed, poured into a mold, and pressed to form the first section of the closed part.

[0027] The first material and the second material are mixed and poured into a mold containing the first section of the closed part, and then pressed into the first section and the second section that are connected to each other.

[0028] The precast component is placed into the cavity.

[0029] The technical solution of this invention has the following advantages:

[0030] 1. The present invention provides a point sealing component. After the injection point is pulled out, the point sealing component is inserted into the point hole. Since there is several meters of groundwater in the point hole, the third material in the first section has a counterweight effect, which can ensure that the sealing component sinks into the point hole. The materials of the first and second sections of the sealing component separate and disperse in the point hole. After the V-shaped clamp loses its binding force, it naturally opens. The counterweight falls down and pushes against the opening angle of the V-shaped clamp, so that it will not close even if it is subjected to upward pressure. The V-shaped clamp will push against the soil of the hole wall. Multiple point sealing components are inserted into the point hole. The multiple V-shaped clamps form a bridging effect. The gaps are filled by the expanded first material, which together support the hole wall and play a repellent role, which can prevent the slurry from flowing up along the hole and reduce the original slurry return of more than 80% to less than 20%.

[0031] 2. The present invention provides a point sealing component, wherein the second material is a water-soluble adhesive material, which allows the sealing component to fully disperse after entering the point hole, thereby allowing the V-shaped clamp to fully open, thus improving the sealing effect of the point sealing component and reducing the amount of slurry return.

[0032] 3. The point sealing component provided by the present invention, compared with the point sealing using cement grout, has bentonite, polyvinyl alcohol, plant fiber and starch in the above-mentioned point sealing component, which are all safe or biodegradable materials. After use, it is environmentally friendly and harmless, and has no effect on groundwater flux or hydraulic gradient. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a structural diagram of the point-sealing component of Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of the V-shaped clamp according to Embodiment 1 of the present invention;

[0036] Figure 3 This is a side view of the V-shaped clip according to Embodiment 1 of the present invention;

[0037] Figure label:

[0038] 1. Enclosure; 2. First section; 3. Second section; 4. Cavity; 5. V-shaped clamp; 6. Counterweight; 7. Placement opening; 8. Side arm; 9. Groove; 10. Hinge; 11. Slot. Detailed Implementation

[0039] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0040] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0041] Example 1

[0042] This embodiment provides a point-sealing component, referring to... Figure 1 The point-sealing component includes a sealing element 1 and a V-shaped clamp 5. The sealing element 1 comprises a first segment 2 and a second segment 3 connected to each other, with a cavity 4 within the second segment 3. The V-shaped clamp 5 is positioned open within the cavity 4, with its opening facing away from the first segment 2. A counterweight 6 is clamped within the V-shaped clamp 5, the counterweight 6 being adapted to open the V-shaped clamp 5. The first segment 2 comprises a first material, a second material, and a third material; the second segment 3 comprises a first material and a second material; the first material is a water-swellable material, the second material is a bonding material, and the third material is the counterweight material.

[0043] After the injection point is removed, the point sealing component is inserted into the point hole. Since there is several meters of groundwater in the point hole, the third material in the first section 2 has a counterweight effect, which can ensure that the sealing component sinks into the point hole. The materials of the first section 2 and the second section 3 of the sealing component 1 separate and disperse in the point hole. After the V-shaped clamp 5 loses its binding force, it naturally opens. The counterweight 6 falls down and pushes against the opening angle of the V-shaped clamp 5, so that it will not close even if it is subjected to upward pressure. The V-shaped clamp 5 will push against the soil of the hole wall. Multiple point sealing components are inserted into the point hole. The multiple V-shaped clamps 5 form a bridging effect. The gaps are filled by the expanded first material, which together support the hole wall and play a repellent role, which can prevent the slurry from flowing up along the hole and reduce the original slurry return of more than 80% to less than 20%.

[0044] Specifically, the second material of the aforementioned sealing component 1 is a water-soluble adhesive material, which allows the sealing component 1 to fully disperse after entering the point hole, thereby enabling the V-shaped clamp 5 to fully open, thus improving the sealing effect of the point sealing component and reducing the amount of slurry return.

[0045] Reference Figure 1 The second segment 3 of the closure 1 is provided with a placement opening 7, which communicates with the cavity 4; the placement opening 7 is adapted to place the V-shaped clip 5 into the cavity 4. Specifically, the placement opening 7 is located at the end of the second segment 3 away from the first segment 2, which makes it easier to insert the V-shaped clip 5.

[0046] Reference Figure 1-3 The V-shaped clamp 5 includes two interconnected side arms 8 forming a V-shaped groove. Each of the two opposing side arms 8 of the V-shaped clamp 5 has a groove 9, with the bottoms of the two grooves 9 facing each other. The grooves 9 are adapted to abut against the side wall of the counterweight 6. The grooves 9 prevent the counterweight 6 from easily slipping out of the V-shaped clamp 5, making it easier to clamp the counterweight 6 into the V-shaped clamp 5.

[0047] Reference Figure 1-3 The two side arms 8 of the V-shaped clamp 5 are identical in shape, and each of the two side arms 8 has a hinge portion 10 at its end, allowing the two side arms 8 to be rotatably connected via the hinge portions 10. Each hinge portion 10 is hemispherical and has several slots 11, with the slots 11 of the hinge portions 10 of the two side arms 8 being cross-connected. In actual production, the side arms 8 of the V-shaped clamp 5 are made using a mold, and then the slots 11 of the hinge portions 10 of the two side arms 8 are cross-connected to form the V-shaped clamp 5.

[0048] Specifically, the groove 9 is teardrop-shaped, extending along the opening of the V-shaped clamp 5 in a direction opposite to the opening of the V-shaped clamp 5 to form a teardrop-shaped groove. When the V-shaped clamp 5 opens, the counterweight 6 falls down and slides along the teardrop-shaped groove. The teardrop-shaped groove 9 makes it easier for the counterweight 6 to fall down and hold the opening angle of the V-shaped clamp 5.

[0049] Reference Figure 1 The counterweight 6 is a spherical counterweight with a smooth spherical surface, resulting in less friction and easier sliding along the direction of the groove 9. Specifically, the counterweight 6 is a small iron-containing sphere with an iron content of not less than 50 wt%.

[0050] Specifically, the first material is bentonite; the moisture content of the bentonite is ≤3%. The second material is polyvinyl alcohol; the degree of alcoholysis of polyvinyl alcohol is not higher than 89%. The third material is iron powder. The V-shaped clip 5 is made of plant fiber, and its preparation materials include: plant fiber, polyvinyl alcohol, starch, and hydrogen peroxide. The plant fiber includes corn, wheat straw, and rice husk; the starch is corn starch and / or potato starch.

[0051] Compared with the use of cement grout for site sealing, the bentonite, polyvinyl alcohol, plant fiber, and starch in the above-mentioned site sealing components are all safe or biodegradable materials. They are environmentally friendly and harmless after use, and have no impact on groundwater flux or hydraulic gradient.

[0052] Specifically, the length of the closure 1 is 30cm and the diameter is 40mm. The length of the first segment 2 is ≤10cm, and the length of the cavity 4 is ≥10cm.

[0053] Example 2

[0054] This embodiment provides a method for preparing the above-mentioned point-sealing component, including the following steps:

[0055] Take 90g of plant fiber, 20g of corn starch, and 10g of hydrogen peroxide (30wt%) and mix them evenly to obtain a first mixture. Add 10g of water to 20g of polyvinyl alcohol and heat to 95℃ and stir evenly to obtain a second mixture. Mix the first and second mixtures and pour them into two molds for V-shaped clamp side arms (each mold contains 1 / 2 of the mixture of the first and second mixtures). Mold the side arms of the V-shaped clamp at 120℃ and 50MPa. Then, splice the two side arms together to form a V-shaped clamp. Insert iron-containing small spheres into the V-shaped clamp as a preform. The plant fiber includes corn, wheat, and rice husk in a mass ratio of 2:1:1.

[0056] Bentonite, polyvinyl alcohol and iron powder are mixed in a mass ratio of 2:1:3. Water is added and the mixture is heated to 95°C and stirred evenly. The mixture is poured into a mold and then pressed at 120°C and 50MPa to form the first section of the closed part. The mass ratio of water to bentonite is 1:2.

[0057] Water is added to polyvinyl alcohol and heated to 95°C and stirred until homogeneous. Then bentonite is added and stirred for 15 minutes. The mixture is poured into a mold and then pressed at 120°C and 50MPa to form the first and second sections that are connected to each other. In this step, the mass ratio of bentonite to polyvinyl alcohol is 3:1 and the mass ratio of water to polyvinyl alcohol is 1:1.

[0058] The precast component is placed into the cavity of the second section to obtain the point-sealing component.

[0059] In this embodiment, the diameter of the iron-containing spheres is 6 mm, and the iron content is 60 wt%. The particle size of the plant fiber, polyvinyl alcohol, starch, iron powder, and bentonite is 200 mesh. The moisture content of the bentonite is 3 wt%, and its model is NKB-MI, purchased from Lingshou County Xintu Mineral Products Co., Ltd. The degree of alcoholysis of the polyvinyl alcohol is 88%, and its model is S8, purchased from Shandong Tianfeng Chemical Technology Co., Ltd.

[0060] Example 3

[0061] This embodiment provides a method for preparing the above-mentioned point-sealing component, including the following steps:

[0062] Take 100g of plant fiber, 10g of potato starch, and 5g of hydrogen peroxide (30wt%) and mix them evenly to obtain a first mixture. Add 20g of water to 40g of polyvinyl alcohol and heat to 95℃ and stir evenly to obtain a second mixture. Mix the first and second mixtures and pour them into two molds for V-shaped clamp side arms (each mold contains 1 / 2 of the mixture of the first and second mixtures). Mold the side arms of the V-shaped clamp at 120℃ and 50MPa. Then, splice the two side arms together to form a V-shaped clamp. Insert iron-containing small spheres into the V-shaped clamp as a preform. The plant fiber includes corn, wheat, and rice husk in a mass ratio of 2:1:1.

[0063] Bentonite, polyvinyl alcohol and iron powder are mixed in a mass ratio of 2:1:3. Water is added and the mixture is heated to 95°C and stirred evenly. The mixture is poured into a mold and then pressed at 120°C and 50MPa to form the first section of the closed part. The mass ratio of water to bentonite is 1:2.

[0064] Water is added to polyvinyl alcohol and heated to 95°C and stirred until homogeneous. Then bentonite is added and stirred for 15 minutes. The mixture is poured into a mold and then pressed at 120°C and 50MPa to form the first and second sections that are connected to each other. In this step, the mass ratio of bentonite to polyvinyl alcohol is 3:1 and the mass ratio of water to polyvinyl alcohol is 1:1.

[0065] The precast component is placed into the cavity of the second section to obtain the point-sealing component.

[0066] In this embodiment, the diameter of the iron-containing spheres is 6 mm, and the iron content is 60 wt%. The particle size of the plant fiber, polyvinyl alcohol, starch, iron powder, and bentonite is 200 mesh. The moisture content of the bentonite is 3 wt%, and its model is NKB-MI, purchased from Lingshou County Xintu Mineral Products Co., Ltd. The degree of alcoholysis of the polyvinyl alcohol is 88%, and its model is S8, purchased from Shandong Tianfeng Chemical Technology Co., Ltd.

[0067] Example 4

[0068] This embodiment provides a method for preparing the above-mentioned point-sealing component. The only difference from Embodiment 2 is that the degree of alcoholysis of the polyvinyl alcohol used in this embodiment is 98%, and its model is Wanwei 1799H, which was purchased from Guangzhou Kuangxuan Chemical Co., Ltd.

[0069] Example 5

[0070] This embodiment provides a method for preparing the above-mentioned point-sealing component. The only difference from Embodiment 2 is that in each step of this embodiment, an equal amount of kaolin is used instead of bentonite.

[0071] Example 6

[0072] This embodiment provides a method for preparing the above-mentioned point-sealing component. The only difference from Embodiment 2 is that the amount of plant fiber used when making the V-shaped clip is 50g.

[0073] Example 7

[0074] This embodiment provides a method for preparing the above-mentioned point sealing component. The only difference from Embodiment 2 is that in each step, an equal amount of epoxy resin is used instead of polyvinyl alcohol. The epoxy resin is E-12 (604) and was purchased from Hubei Peizi Pharmaceutical Technology Co., Ltd.

[0075] Test case

[0076] The sealing effect of the point-sealing components prepared in the embodiments was tested. The tests were divided into experimental group, control group 1, and control group 2. The experimental group used the point-sealing components prepared in the embodiments for testing. Control group 1 did not seal the injection points, and control group 2 sealed the injection points with cement grout. The specific test method was as follows: two injection points were set in each group, including point 1 and point 2. 200 kg of cement grout was injected into point 1. A 25wt% biological agent (model EHC, purchased from Beijing Yiweikem Environmental Technology Co., Ltd.) was injected over a total of 20 minutes. After the tube was removed, 15kg of water was added and the mixture was allowed to stand for 15 minutes. Then, the corresponding sealing method in Table 1 was used to seal the points (control group 1 did not undergo point sealing). 200kg of the same biological agent was injected into point 2, which is 1m away from point 1. At the same time, the slurry return situation at point 1 was observed. The slurry returned from point 1 was collected, weighed, and the slurry return volume was calculated. Slurry return volume = weight of slurry agent returned / weight of injected slurry agent * 100%. The experimental results are shown in Table 1.

[0077] In the experimental group, 40 sealing components were used at each injection point during the point sealing process; in the control group 2, 20g of cement grout was injected. The cement grout was made by mixing cement of model JTB903 purchased from Henan Jingtong Building Materials Co., Ltd. with 20kg of water.

[0078] Table 1

[0079]

[0080]

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A point-sealing component, characterized in that, include: A closure component; the closure component includes a first section and a second section connected to each other; the second section has a cavity; A V-shaped clamp is provided openly within a cavity, with the opening of the V-shaped clamp facing away from the first section; a counterweight is provided inside the V-shaped clamp, and the counterweight is adapted to open the V-shaped clamp. The first segment includes a first material, a second material, and a third material; the second segment includes a first material and a second material; the first material is a water-swellable material, the second material is a cementing material, and the third material is a counterweight material; the second material is a water-soluble cementing material.

2. The point-sealing component according to claim 1, characterized in that, The second section of the closure is provided with a placement opening, which communicates with the cavity; the placement opening is adapted to place the V-shaped clamp in the cavity.

3. The point-sealing component according to claim 1, characterized in that, The V-shaped clamp includes two side arms that are connected to each other to form a V-shaped groove. Each of the two opposite side arms of the V-shaped clamp is provided with a groove, and the bottoms of the two grooves are arranged opposite each other. The grooves are adapted to abut against the side wall of the counterweight.

4. A point-sealing component according to claim 1, characterized in that, The mass ratio of the first material, the second material, and the third material in the first segment is (1-3):(0.5-2):(2-5); And / or, the mass ratio of the first material and the second material in the second paragraph is (2-4):(0.5-2).

5. A point-sealing component according to claim 1, characterized in that, The first material is bentonite; And / or, the second material is polyvinyl alcohol; And / or, the third material is iron powder.

6. A point-sealing component according to claim 5, characterized in that, The bentonite has a moisture content of ≤3%; And / or, the degree of alcoholysis of the polyvinyl alcohol is not higher than 89%.

7. A point-sealing component according to claim 1, characterized in that, The counterweight is a spherical counterweight.

8. A point-sealing component according to claim 1, characterized in that, The materials used to prepare the V-shaped clip, by weight, include: 90-100 parts of plant fiber, 20-40 parts of polyvinyl alcohol, 10-20 parts of starch, and 5-10 parts of hydrogen peroxide.

9. A point-sealing component according to claim 8, characterized in that, The plant fibers include corn, wheat straw, and rice husks; And / or, the starch is corn starch and / or potato starch.

10. A method for preparing a point-sealing component according to any one of claims 1-9, characterized in that, Includes the following steps: Use molds to make V-shaped clamps, and clamp the counterweights into the V-shaped clamps as prefabricated parts; The first material, the second material, and the third material are mixed, poured into a mold, and pressed to form the first section of the closed part. The first material and the second material are mixed and poured into a mold containing the first section of the closed part, and then pressed into the first section and the second section that are connected to each other. The precast component is placed into the cavity.

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