Equipment and method for improving soil vertical diaphragm wall

Abstract

The invention provides equipment and a method for improving a soil vertical diaphragm wall, the equipment comprises a traction head, a bracket and a slurry pond, the traction head is connected with the bracket and is used for pulling the bracket to move forward; at least one stirring head is rotationally mounted on the bracket and is in driving connection with the traction head; a slurry spraying opening is formed in the stirring head; slurry is contained in the slurry pond, and the slurry spraying opening is communicated with the slurry pond. The method comprises the steps that a traction head drags a support to walk forwards, meanwhile, the traction head drives a stirring head to rotate, a slurry spraying opening sprays slurry or the slurry flows out under the action of gravity, and therefore the slurry and soil are mixed under a soil layer, and a vertical reverse osmosis layer roughly perpendicular to the upper surface of the soil layer is formed; according to the equipment and the method for improving the soil vertical anti-seepage wall, the defects that the existing soil improvement cost is high, the construction difficulty is high, repairing is not easy, and the equipment and the method are not suitable for improving a large-area soil anti-seepage wall are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil cutoff wall improvement, in particular to a device and method for soil vertical cutoff wall improvement. BACKGROUND

[0002] Soil is the basic condition for plant growth, providing nutrients and water for plant growth. The properties of soil directly determine whether it is suitable for plant growth. For example, saline-alkali land, contaminated land, arid land, desert, and other lands unsuitable for plant growth need to be improved to meet the needs of plant growth.

[0003] In existing soil improvement technologies, chemical improvement (neutralization), flooding (flushing), and lowering the groundwater level are commonly used to improve saline-alkali land, contaminated land, and other soils. For arid lands such as deserts, drip irrigation technology is used to maintain a certain amount of moisture in the soil.

[0004] Existing technologies can improve soil, but they require large investments and have low sustainability. For example, the improvement of saline-alkali land and contaminated land often leads to reverse seepage, causing soil to be recontaminated. For arid lands, although drip irrigation can maintain a certain amount of moisture in the soil, water can easily escape from the soil's crevices or be absorbed by deep soil, resulting in ineffective irrigation of plants.

[0005] Due to the importance of impermeability in soil improvement, existing technologies also use methods such as covering the soil surface with plastic film and backfilling or laying cement to prevent seepage. However, this method effectively divides the soil layers, cutting off the connection between the upper and lower soil layers and creating certain ecological risks. At the same time, plastic film and cement can easily cause secondary pollution of the land. There are also articles and cases that use clay to establish a reverse seepage barrier. For example, the article "Research on the Impermeability of Bentonite-Clay Sealing Material in Flexible Vertical Impermeability Technology" published in the Journal of Environmental Engineering Technology, Volume 12, Issue 3, May 2022, discloses a method of using bentonite clay to establish a vertical impermeability barrier. The article "Research on the Impermeability System Technology of Wetland Engineering" published in the Industrial Technology, September 2023, Total Issue 543, discloses a bentonite clay and its impermeability technology, as well as a bentonite blanket using 2 layers of geosynthetic material to fill the gaps with bentonite or substances with poor water permeability, using adhesion, suturing, and other methods to form materials with impermeability. Some bentonite blankets only contain 1 layer of geotextile membrane, with a layer of bentonite of appropriate thickness applied on top using a water-soluble adhesive. In addition, bentonite blankets are also used for reverse seepage treatment in the impermeability structure of the artificial lake in the Beijing Olympic Forest Park.

[0006] However, the above anti-seepage method has obvious disadvantages in the construction of vertical anti-seepage wall, i.e. high cost, great construction difficulty, and difficult repair once partial anti-seepage layer fails, and is not suitable for large-area soil vertical anti-seepage wall improvement. SUMMARY

[0007] (1) Technical problem to be solved

[0008] Therefore, the present application provides a device and method for soil vertical anti-seepage wall improvement, which overcomes the defects of high cost, great construction difficulty, and difficult repair of the prior art, and is suitable for large-area soil vertical anti-seepage wall improvement.

[0009] (2) Technical scheme

[0010] To solve the above technical problem, the present application provides a soil anti-seepage wall improvement device, which comprises a traction head, a support and a slurry pool, the traction head is connected with the support and used for pulling the support to move forward, at least one stirring head is rotatably installed on the support, the stirring head is drivingly connected with the traction head, a slurry injection port is arranged on the stirring head, the slurry pool is filled with slurry, and the slurry injection port is in communication with the slurry pool; in use, the support is pulled forward by the traction head, the traction head drives the stirring head to rotate, and the slurry injection port sprays or flows out the slurry under the action of gravity, so that the slurry and soil are mixed in the soil layer and a vertical anti-seepage layer is formed which is substantially perpendicular to the upper surface of the soil layer.

[0011] In some embodiments, the stirring head is connected with a stirring chain, the stirring chain is wound around the stirring head, the stirring chain is drivingly connected with the traction head, and the stirring chain is arranged along the moving direction of the traction head.

[0012] In some embodiments, the bottom of the stirring head is inclined, and the height of the inclined end gradually increases along the traction direction.

[0013] In some embodiments, the stirring head is a hollow stirring rod, and a slurry channel is arranged in the stirring rod in the axial direction; the slurry channel is in communication with the slurry injection port, and the upper end of the slurry channel is in communication with the slurry pool through a slurry pipe.

[0014] In some embodiments, the slurry pool is arranged on the support and / or the ground, a slurry pump is arranged at the slurry pool, and the slurry pump is in communication with the slurry injection port.

[0015] In some embodiments, the traction head is a tractor, the support is swingably connected with the traction head, or the support is liftably connected with the traction head.

[0016] In some embodiments, the number of stirring heads is at least two, and the stirring heads are arranged in parallel along the direction of travel of the traction head; and / or, the rotation directions of the at least two stirring heads are opposite.

[0017] In some embodiments, the height of the lower end of the stirring head gradually increases along the traction direction.

[0018] In some embodiments, the stirring heads are arranged in at least two rows in parallel along the direction of travel of the traction head.

[0019] In some embodiments, a plurality of layers of spirals are arranged on the outer circumferential wall of the stirring head along the axial direction thereof, and the plurality of layers of spirals are used to break the soil and form stirring of the slurry; the slurry injection port is staggered with the plurality of layers of spirals.

[0020] In some embodiments, the plurality of layers of spirals are helical spirals.

[0021] Based on the same inventive concept, the application also provides a method for improving a soil vertical anti-seepage wall, wherein a support is pulled forward by a traction head, and the traction head drives a stirring head on the support to rotate, a slurry injection port on the stirring head sprays slurry in a slurry pool, so that the slurry and the soil are mixed under the soil layer and a vertical anti-seepage layer is formed which is substantially perpendicular to the upper surface of the soil layer.

[0022] In some embodiments, the method specifically comprises the following steps:

[0023] Step S01, preparation work is performed; first, the site to be improved is observed, and if the site is uneven, the site is leveled; then, the soil anti-seepage wall improvement equipment is moved to the site, and slurry is prepared and contained in the slurry pool;

[0024] Step S02, the depth of the anti-seepage layer is adjusted; the soil anti-seepage wall improvement equipment is started, the traction head drives the stirring head to rotate, the slurry pump at the slurry pool is started or the slurry flows out by gravity, the slurry injection port sprays the slurry, and the stirring head moves downward and rotates to cut the soil until the desired height of the anti-seepage layer is reached;

[0025] Step S03, soil improvement work is performed; the traction head drives the support to move forward, and the stirring head continuously rotates, the slurry pump continuously sends slurry, and the slurry injection port continuously sprays the slurry under the soil layer, so that the slurry and the soil continuously mix under the soil layer and form a vertical anti-seepage layer;

[0026] Step S04, the soil anti-seepage wall improvement equipment works along the preset path until the soil to be improved is stirred, and finally the stirring head is lifted and the slurry pump is turned off.

[0027] In some embodiments, the slurry is a mixed liquid of water and clay, and one or more of bentonite, polyacrylamide, gypsum or plant fiber is added to the clay.

[0028] In some embodiments, the depth of the vertical anti-seepage layer is 30-200 cm, determined according to the root depth of the planted plant; when the planted plant is a vegetable, the depth of the vertical anti-seepage layer is 30-50 cm; when the planted plant is a tree, the depth of the vertical anti-seepage layer is 50-200 cm; and the rotating speed of the stirring head is less than 1000 r / min.

[0029] (Three) beneficial effects

[0030] Compared with the prior art, the above-mentioned at least one technical scheme adopted by the embodiments of the present specification can achieve at least the following beneficial effects:

[0031] 1) The soil vertical anti-seepage wall improvement equipment and method drives the support to move forward through the traction head, rotates the stirring head, and sprays the slurry from the slurry spraying port, so that the slurry mixes with the soil under the soil layer to form a vertical anti-seepage layer. Unlike the existing technology, there is no need to perform complex operations such as laying plastic film and cement, which greatly simplifies the construction process, reduces the construction difficulty, and makes the construction more convenient and easy to operate.

[0032] 2) For a large area of land that needs to be improved by vertical anti-seepage, the equipment can continuously work under the soil layer. Compared with the complex and time-consuming construction method in the prior art, the working efficiency is greatly improved, and the anti-seepage wall improvement work of a large area of soil can be quickly completed to meet the demand for large-scale land improvement.

[0033] 3) The vertical anti-seepage layer has a certain thickness and is not easy to fail or break, has good use effect, and has long service life. Even if the anti-seepage layer fails or breaks at some point, it only needs to be reworked once, that is, the equipment is used again according to the original construction method to work on the failure point, so that the anti-seepage layer can be repaired. Compared with the difficult repair problem in the prior art, maintenance is more convenient and efficient, and the loss caused by damage to the anti-seepage layer is reduced. After construction is completed, the forming effect of the anti-seepage layer can be directly observed by digging a hole in the soil layer, and the construction quality can be conveniently and quickly detected. This simple detection method enables construction personnel to discover problems in time and make adjustments, thereby ensuring the quality of soil anti-seepage improvement. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any inventive labor.

[0035] Figure 1 is a perspective view of an apparatus for improving a vertical anti-seepage wall of soil according to the present application;

[0036] Figure 2 is a structural schematic view of an apparatus for improving a vertical anti-seepage wall of soil according to the present application;

[0037] Figure 3 is a structural schematic view of an apparatus for improving a vertical anti-seepage wall of soil according to the present application in use;

[0038] Figure 4 is a perspective view of a stirring head and a support connection of an apparatus for improving a vertical anti-seepage wall of soil according to the present application;

[0039] Figure 5 is a perspective view of a stirring head and a support connection of an apparatus for improving a vertical anti-seepage wall of soil according to the present application from another angle;

[0040] Figure 6 is a structural schematic view of a stirring head and a support connection of an apparatus for improving a vertical anti-seepage wall of soil according to the present application;

[0041] Figure 7 is a structural schematic view of a stirring head lower end height change of an apparatus for improving a vertical anti-seepage wall of soil according to the present application;

[0042] Figure 8 is a structural schematic view of a stirring head stirring chain installation of an apparatus for improving a vertical anti-seepage wall of soil according to the present application;

[0043] Corresponding component names of various reference numerals in the figure are as follows: 1, a traction head; 2, a support; 3, a slurry pool; 4, a stirring head; 401, a spraying port; 402, a slurry passage; 403, a multi-layered twisted sheet; 404, a stirring chain; 5, a slurry pipe; 6, a slurry pump. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0045] The following detailed description is presented in order to describe the embodiments of the application and it is not intended that the application be limited thereto. It will be appreciated that those skilled in the art can readily apply the principles described herein without the use of experimentation, and that the present application is thereby not limited to the embodiments described herein. It is therefore contemplated that the claims can encompass other variations, modifications and alternative methods as fall within the scope of the application. It is understood that the examples described below are merely illustrative and that the application can be practiced by other than the methods described below. It is also understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the present application will be limited only by the appended claims.

[0046] It is to be understood that the foregoing description is that of certain examples of the application and that numerous changes in the details of construction and the combination and arrangement of parts can be made by those skilled in the art without departing from the scope of the application. It is intended that all such changes be within the scope of the following claims.

[0047] It is also to be understood that the following description is only illustrative of the aspects of the application and that numerous modifications can be made by those skilled in the art without departing from the scope of the application as disclosed in the appended claims.

[0048] In addition, in the following description, numerous specific details are provided for a thorough understanding of the examples. One skilled in the relevant art will recognize, however, that the application can be practiced without one or more of these specific details, or with other methods, components, materials, and so forth.

[0049] In conjunction Figures 1-8As shown, the present application provides a device for soil vertical cutoff wall improvement, which comprises a traction head 1, a support 2 and a slurry pool 3, the traction head 1 and the support 2 are connected, and the traction head 1 is located at the front side of the support 2 for towing the support 2 to move forward. At least one stirring head 4 is rotatably installed on the support 2, the stirring head 4 is drivingly connected with the traction head 1, and the traction head 1 can drive the stirring head 4 to rotate. The stirring head 4 is provided with a slurry injection port 401; the slurry pool 3 is filled with slurry, and the slurry injection port 401 is communicated with the slurry pool 3; in use, the support 2 is towed forward by the traction head 1, at the same time, the traction head 1 drives the stirring head 4 to rotate, and the slurry injection port 401 sprays or flows out slurry under the action of gravity, so that the slurry and the soil are mixed under the soil layer and a vertical anti-seepage layer is formed which is substantially perpendicular to the upper surface of the soil layer.

[0050] With the cooperation of the traction head 1, the support 2, the slurry pool 3 and the stirring head 4, the construction process is greatly simplified, the construction difficulty is reduced, and the construction is more convenient and easy to operate; the device can continuously work under the soil layer, greatly improving the work efficiency, quickly completing the vertical cutoff wall improvement work of a large area of soil, and meeting the demand of large-scale land improvement; the three-dimensional anti-seepage layer is not easy to fail or damage, even if the anti-seepage layer fails or is damaged, only one-time re-construction is needed, that is, the device is used again according to the original construction method to work at the failure point, so that the anti-seepage layer can be repaired, the maintenance is more convenient and efficient, and the loss caused by the damage of the anti-seepage layer is reduced; after the construction is completed, the forming effect of the anti-seepage layer can be directly observed by digging a hole in the soil layer, and the construction quality can be conveniently and quickly detected. This simple detection method enables the construction personnel to timely find problems and make adjustments, thereby ensuring the quality of the soil vertical cutoff wall improvement.

[0051] In some embodiments, as shown in the drawings, the stirring head 4 is connected with a stirring chain 404, the stirring chain 404 is wound around the stirring head 4, the stirring chain 404 is drivingly connected with the traction head 1, the traction head 1 can drive the stirring chain 404 to rotate, and the stirring chain 404 is arranged along the advancing direction of the traction head 1. Figure 8 This structure installs the stirring chain 404 on the stirring head 4, the slurry injection port 401 can be arranged at a position of the stirring head 4 close to the stirring chain 404, the stirring chain 404 can stir the soil and the slurry at the same time of the slurry injection of the slurry injection port 401, the mixture is more uniform, the use effect is better, and stirring teeth can also be arranged on the stirring chain 404, which can more easily cut the soil and form stirring. The traction head 1 drives the stirring chain 404 is prior art, which will not be described herein.

[0052] In some embodiments, as shown in the drawings, the stirring head 4 is connected with a stirring chain 404, the stirring chain 404 is wound around the stirring head 4, the stirring chain 404 is drivingly connected with the traction head 1, the traction head 1 can drive the stirring chain 404 to rotate, and the stirring chain 404 is arranged along the advancing direction of the traction head 1. Figure 8As shown, the bottom of the stirring head 4 is inclined, and the inclined end of the stirring head 4 gradually increases in height along the traction direction. With the inclined bottom of the stirring head 4, the stirring head 4 has the effect of rotating and cutting the soil during use, facilitating the entry of the stirring head 4 into the soil and facilitating the traction of the traction head 1.

[0053] In some embodiments, as shown in Figure 4 and Figure 6 The stirring head 4 is a hollow stirring rod, and the inside of the stirring rod is provided with a slurry passage 402 in the axial direction. The lower end of the slurry passage 402 is in communication with the slurry nozzle 401, and the upper end of the slurry passage 402 is in communication with the slurry pool 3 through the slurry pipe 5.

[0054] In some embodiments, as shown in Figure 1 and Figure 2 The slurry pool 3 is arranged on the support 2 and / or on the ground. According to the situation of the construction site, the slurry pool 3 can be arranged directly on the support 2 or the slurry pool 3 can be arranged on the ground and connected through the slurry pipe 5 and the stirring head 4. The slurry pool 3 can also be arranged on both the support 2 and the ground, so that the support 2 can be counterweighted, and the problem of discontinuity of the slurry can be avoided. The slurry pump 6 is installed at the slurry pool 3, and the slurry pump 6 is in communication with the slurry nozzle 401. The slurry pump 6 can pump the slurry in the slurry pool 3 to the slurry nozzle 401, and the slurry can be sprayed at the slurry nozzle 401. The slurry pump 6 can ensure the spraying intensity of the slurry nozzle 401.

[0055] In some embodiments, as shown in Figure 1 and Figure 2 The traction head 1 has a walking wheel to pull the support 2 forward, and the traction head 1 has a power device to drive the stirring head 4 to rotate,

[0056] The traction head 1 is preferably a tractor. How the traction head 1 drives the stirring head 4 to rotate is prior art, such as driving connection through gears, belts, or hydraulic pressure, etc. This embodiment will not be described again. The support 2 is swingably connected with the traction head 1, or the support 2 is liftably connected with the traction head 1, so as to ensure that the stirring head 4 can displace in the vertical direction and ensure the feasibility of the structure.

[0057] In some embodiments, as shown in Figure 4 and Figure 5As shown, the number of stirring heads 4 is at least two, and they are arranged in parallel along the advancing direction of the traction head 1. The number of stirring heads 4 is preferably more than four, and arranging multiple stirring heads can increase the area of one-time operation and improve the operation efficiency. At least two stirring heads 4 are preferably arranged in opposite directions, and more preferably, the adjacent two stirring heads 4 are arranged in opposite directions. When the stirring heads rotate, they will generate reverse torsion, which will cause the traction head to deviate to one side. Therefore, the stirring heads are arranged in different directions, and the reverse torsion generated during stirring can be offset, thereby keeping the support balanced.

[0058] In some embodiments, as shown in Figure 7 As shown, the height of the multiple rows of stirring heads 4 gradually increases along the lower end of the traction direction.

[0059] In some embodiments, as shown in Figure 1 and Figure 4 , the stirring heads 4 are arranged in at least two rows in parallel along the advancing direction of the traction head 1, and the stirring heads 4 in the adjacent two rows are correspondingly arranged.

[0060] In some embodiments, as shown in Figure 1 and Figure 4 , the outer circumferential wall of the stirring head 4 is provided with multiple layers of spirals 403 along the axial direction thereof, which are used to break the soil and stir the slurry, so as to facilitate the forward movement of the traction head, and can also loosen the soil. The slurry injection port 401 is staggered with the multiple layers of spirals 403 to avoid interference. The multiple layers of spirals 403 can be preferably spiral spirals, which are convenient to manufacture and have better use effect.

[0061] Based on the same inventive concept, the application also provides a method for improving a soil vertical cutoff wall, which is implemented by using the above-mentioned device for improving a soil vertical cutoff wall. When used, the support 2 is pulled forward by the traction head 1, and the traction head 1 drives the stirring heads 4 on the support 2 to rotate, and the slurry injection port 401 on the stirring head 4 sprays the slurry in the slurry pool 3, so that the slurry and the soil are mixed under the soil layer and form a vertical anti-seepage layer which is substantially perpendicular to the upper surface of the soil layer.

[0062] In some embodiments, the method comprises the following steps:

[0063] Step S01, preparation; first, the site to be improved is observed, and if the site is uneven, the site is leveled to avoid the slurry surface from being too large due to uneven site during construction, resulting in an incomplete anti-seepage layer; then the soil vertical cutoff wall improvement device is moved to the site, and the slurry is prepared and contained in the slurry pool 3;

[0064] Step S02, adjusting the depth of the anti-seepage layer; the soil anti-seepage wall improvement equipment is started, the traction head 1 drives the stirring head 4 to rotate, the slurry pump 6 at the slurry pool 3 is started or relies on gravity to make the slurry flow out, the slurry is sprayed from the slurry spraying port 401, and the stirring head 4 moves downward and rotates to cut the soil until the desired height of the anti-seepage layer is reached;

[0065] Step S03, performing soil improvement work; the support 2 is driven by the traction head 1 to move forward, the stirring head 4 continues to rotate, the slurry pump 6 continuously sends slurry, and the slurry spraying port 401 continuously sprays the slurry under the soil layer, so that the slurry and the soil continuously mix under the soil layer and form a vertical anti-seepage layer;

[0066] Step S04, the soil anti-seepage wall improvement equipment works back and forth along the preset path (S-shaped path) until the soil in the area to be improved is stirred, and finally the stirring head 4 is lifted and the slurry pump 6 is turned off. It should be particularly pointed out that the start and stop time of the slurry pump 6 in the above steps is not limited to the time when the slurry pump 6 can only be started and stopped. The slurry pump 6 can be started before the anti-seepage layer needs to be worked and stopped after the anti-seepage layer work is completed. Therefore, the start and stop of the slurry pump 6 in the above steps is only to indicate that the slurry pump 6 needs to be started when the anti-seepage layer needs to be sprayed and stirred, and stopped after the construction is completed, and is not intended to limit the start and stop time of the slurry pump 6. Secondly, the preparation work of step S01 can be performed simultaneously or in any order. In addition, the stirring head 4 can also be lowered to the designed depth during the movement of the traction head 1. No limitation is made in this regard.

[0067] In some embodiments, the slurry is a mixture of water and clay, and one or more of bentonite, polyacrylamide, gypsum or plant fiber is added to the clay.

[0068] After absorbing water, bentonite can expand to 8-15 times its original volume and form a gel-like substance. Mixing bentonite with clay can improve the swelling property. Moreover, bentonite has high adsorption property and can adsorb water, oil, toxins and heavy metals. Of course, the proportion of bentonite in clay is not the higher the better, and the proportion of bentonite added is usually below 20%, such as the influence of the amount of bentonite added on the anti-seepage performance in the article “Research on Anti-seepage Performance of Bentonite-Clay Sealing Material in Flexible Vertical Anti-seepage Technology” in Environmental Engineering Technology, Vol. 12, No. 3, May 2022. It is pointed out that when the addition amount is 0%-5%, the anti-seepage improvement effect is good, but when the addition amount is greater than 12%, the anti-seepage effect improves slowly.

[0069] In the clay soil, gypsum powder is added. Gypsum also has the effect of reducing swelling and shrinking, improving strength and increasing impermeability of clay soil. At the same time, gypsum has excellent performance of replacing sodium with calcium ions and reducing alkalinity, which can play a more excellent effect in soil improvement of saline-alkali soil and the like. The addition ratio of gypsum is usually below 10%. When the addition amount is 0%-5%, it has a good anti-seepage effect. When the addition amount is higher than 5%, it has the characteristics of high strengthening.

[0070] In the clay soil, a small amount of plant fiber is added. The addition of plant fiber can increase the anti-cracking performance of clay soil.

[0071] In some embodiments, the depth of the vertical anti-seepage layer is 30-200 cm, which is determined according to the root depth of the planted plants. When the planted plants are vegetables, the depth of the vertical anti-seepage layer is 30-50 cm. When the planted plants are trees, the depth of the vertical anti-seepage layer is 50-200 cm. In this way, the soil for planting and the soil at the bottom of the ground can be separated by anti-seepage. The rotation speed of the stirring head 4 is less than 1000 r / min, preferably 150-800 r / min.

[0072] For the anti-seepage operation of a large area, in order to avoid the influence of partial anti-seepage failure on all soil layers, the soil to be improved can be divided into blocks for multi-layer anti-seepage construction. In addition, for the soil with serious salinization, better anti-seepage or arid land such as desert, which requires higher moisture retention, the anti-seepage layer can be two layers. When the two-layer anti-seepage layer is constructed, the stirring head can be lifted to a certain height after the bottom layer is constructed, and steps S02-S04 can be repeated. The two anti-seepage layers can form a water retention layer, which can enhance the anti-seepage and water retention effect, and the water retention layer is also easy to breed microorganisms, which can better improve the effect of soil improvement.

[0073] In the specification, the same or similar parts between the embodiments are referred to each other, and each embodiment focuses on the difference from other embodiments. Especially for the embodiments described later, the description is relatively simple, and the related parts are referred to the part of the foregoing embodiments.

[0074] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for improving vertical soil impermeable walls, characterized in that: The system includes a traction head (1), a support (2), and a slurry tank (3). The traction head (1) is connected to the support (2) and is used to pull the support (2) forward. At least one stirring head (4) is rotatably mounted on the support (2) and is drivenly connected to the traction head (1). A slurry nozzle (401) is provided on the stirring head (4). The slurry tank (3) is filled with slurry, and the slurry nozzle (401) is connected to the slurry tank (3). In use, the support (2) is pulled forward by the traction head (1), and at the same time, the traction head (1) drives the stirring head (4) to rotate. The slurry is sprayed or flows out under gravity by the slurry nozzle (401), so that the slurry and soil are mixed under the soil layer and a vertical reverse seepage wall is formed that is approximately perpendicular to the upper surface of the soil layer.

2. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The stirring head (4) is connected to a stirring chain (404), the stirring chain (404) is wound around the stirring head (4), the stirring chain (404) is driven by the traction head (1), and the stirring chain (404) is arranged along the travel direction of the traction head (1).

3. The equipment for improving vertical soil impermeable walls according to claim 2, characterized in that: The bottom of the stirring head (4) is inclined, and the height of the inclined end gradually increases along the traction direction.

4. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The stirring head (4) is a hollow stirring rod with a slurry channel (402) arranged axially inside. The slurry channel (402) is connected to the slurry nozzle (401), and the upper end of the slurry channel (402) is connected to the slurry tank (3) through the slurry pipe (5).

5. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The slurry pool (3) is set on the support (2) and / or on the ground; a slurry pump (6) is installed at the slurry pool (3), and the slurry pump (6) is connected to the slurry nozzle (401).

6. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The traction head (1) is a tractor; the bracket (2) is sway-connected to the traction head (1), or the bracket (2) is scissor-connected to the traction head (1).

7. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The number of stirring heads (4) is at least two, and they are arranged in parallel along the direction of travel of the traction head (1); and / or, at least two stirring heads (4) rotate in opposite directions.

8. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The height of the stirring head (4) gradually increases along the traction direction.

9. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The stirring heads (4) are arranged in at least two rows parallel to the direction of travel of the traction head (1).

10. The equipment for improving vertical soil impermeable walls according to claim 1, characterized in that: The stirring head (4) has multiple layers of shaving blades (403) arranged along its axial direction on its outer circumferential wall. The multiple layers of shaving blades (403) are used to break up the soil and stir the slurry. The slurry nozzle (401) is offset from the multiple layers of shaving blades (403).

11. The equipment for improving vertical soil impermeable walls according to claim 10, characterized in that: The multi-layered agitator (403) is a spiral agitator.

12. A method for improving vertical soil impermeable walls, characterized in that: The traction head (1) pulls the support (2) forward, and at the same time the traction head (1) drives the mixing head (4) on the support (2) to rotate. The grout nozzle (401) on the mixing head (4) sprays the grout in the grout pool (3) out, so that the grout and soil are mixed under the soil layer and a vertical reverse seepage layer is formed that is approximately perpendicular to the upper surface of the soil layer.

13. The method for improving vertical soil impermeable walls according to claim 12, characterized in that, Specifically, the following steps are included: Step S01, make preparations; first, observe the site to be improved. If the site is not level, level it; then move the soil impermeable wall improvement equipment to the site and prepare slurry and place it in the slurry tank (3). Step S02, adjust the depth of the reverse seepage layer; turn on the soil seepage barrier improvement equipment, the traction head (1) drives the mixing head (4) to rotate, turn on the slurry pump (6) at the slurry tank (3) or rely on gravity to flow out the slurry, the spray nozzle (401) sprays the slurry, the mixing head (4) moves downward and rotates to cut the soil until the desired reverse seepage layer height is reached; Step S03, soil improvement operation is carried out; the traction head (1) drives the support (2) forward, while the mixing head (4) rotates continuously, the slurry pump (6) continuously delivers slurry, and the slurry nozzle (401) continuously sprays the slurry under the soil layer, so that the slurry and soil are continuously mixed under the soil layer and a vertical reverse seepage layer is formed. Step S04: The soil impermeable wall improvement equipment operates along a preset path until the plot to be improved is mixed. Finally, the mixing head (4) is raised and the slurry pump (6) is turned off.

14. The method for improving vertical soil impermeable walls according to claim 12, characterized in that: The slurry is a mixture of water and clay, wherein one or more of bentonite, polyacrylamide, gypsum, or plant fiber are added to the clay.

15. The method for improving vertical soil impermeable walls according to claim 12, characterized in that: The depth of the vertical reverse osmosis layer is 30-200cm, which is determined according to the root depth of the plant; when the plant is a vegetable, the depth of the vertical reverse osmosis layer is 30-50cm; when the plant is a tree, the depth of the vertical reverse osmosis layer is 50-200cm; the rotation speed of the stirring head (4) is less than 1000r / min.

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