Structure and method for eliminating groundwater top load of whole reservoir basin anti-seepage structure

Abstract

The present invention discloses an arrangement structure and a process method for eliminating the groundwater top-supporting load of the anti-seepage structure of the entire reservoir basin, and belongs to the technical field of design and construction of water conservancy and hydropower engineering structures. Provided is an arrangement structure and a process method for eliminating the groundwater top-supporting load of the anti-seepage structure of the entire reservoir basin, which has a relatively small engineering volume, relatively low investment cost, and good drainage effect. The arrangement structure includes a reservoir basin, and the arrangement structure also includes a sliding one-way seepage pressure reduction system. An anti-seepage layer is laid on the inner wall of the reservoir basin, and the pressure water inside and outside the anti-seepage layer is unidirectionally connected to the inside of the reservoir basin through the sliding one-way seepage pressure reduction system. The process method eliminates the top-supporting load of groundwater by balancing the water pressure inside and outside the anti-seepage layer of the reservoir basin through the one-way seepage reduction system arranged on the bottom of the reservoir basin.

Description

Technical Field

[0001] The present invention relates to an arrangement structure, and more particularly to an arrangement structure for eliminating the groundwater top load of an entire reservoir basin anti-seepage structure, belonging to the technical field of design and construction of water conservancy and hydropower engineering structures. The present invention also relates to a process for eliminating the groundwater top load of an entire reservoir basin anti-seepage structure using the arrangement structure. Background Art

[0002] Explanation of terms:

[0003] Whole-basin anti-seepage: refers to the use of engineering measures to carry out anti-seepage treatment on excavated or natural reservoir basins, isolating the reservoir water from the external water environment to prevent water from seeping out of the basin;

[0004] Groundwater: water stored in the strata below the ground;

[0005] Lifting effect: When the water level in the reservoir basin is lower than the groundwater level outside the reservoir, the buoyancy force generated on the anti-seepage structure of the entire reservoir basin is generated under the action of the head difference.

[0006] Pumped storage technology, which uses water as an energy storage medium, is currently the most technologically mature, most economical, and most suitable for large-scale development. It is the key to achieving the transformation of new power systems. As is well known, pumped storage uses electricity to pump water from the lower reservoir to the upper reservoir to achieve energy storage. The water from the upper reservoir then flows to the lower reservoir to convert potential energy into electrical energy. In this process, water is the key to energy conversion, and its leakage is a key issue in the construction of pumped storage. To solve the leakage problem of the upper reservoir, most methods use a full-basin anti-seepage method to isolate the upper reservoir water from the surrounding groundwater environment.

[0007] Although the full-basin anti-seepage method can isolate the reservoir water from the surrounding groundwater environment and prevent leakage, it is subject to the reaction of groundwater. When the reservoir is empty, it is easy to form a groundwater support effect, which can easily cause damage to the anti-seepage structure and affect its anti-seepage effect.

[0008] As mentioned above, the full-reservoir basin anti-seepage form can isolate the reservoir water from the surrounding groundwater environment and prevent leakage of the reservoir water. However, the full-reservoir basin anti-seepage form has the reaction of groundwater. When the reservoir is empty, it is easy to form a groundwater jacking effect, causing damage to the anti-seepage body. The existing technology mainly has two aspects. One is to offset the jacking effect of groundwater through the deadweight of the full-reservoir basin anti-seepage measures structure. The other is to focus on drainage. At the bottom of the upper reservoir basin, interception and drainage corridors are set to discharge groundwater and lower the groundwater level to eliminate the jacking effect of groundwater. Both solutions have problems such as large engineering workload, low economic efficiency, and uncontrollable effects. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a layout structure for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin, which has a relatively small engineering volume, relatively low investment cost and good drainage effect. The present invention also provides a process method for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin by using the said layout structure.

[0010] The technical solution adopted to solve the above technical problems is: an arrangement structure for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin, including a reservoir basin, and the arrangement structure also includes a sliding one-way seepage and pressure reduction system. An anti-seepage layer is laid on the inner wall of the reservoir basin, and the pressure water inside and outside the anti-seepage layer is unidirectionally communicated toward the inner side of the reservoir basin through the sliding one-way seepage and pressure reduction system.

[0011] Wherein, the anti-seepage layer is an asphalt concrete layer laid on the inner wall of the reservoir basin.

[0012] Furthermore, the sliding one-way water seepage and pressure reduction system includes a one-way filtering water seepage mechanism and a reverse water sealing closing mechanism. The one-way filtering water seepage mechanism is embedded in the foundation of the bottom of the reservoir basin. The one-way filtering water seepage mechanism is opened or closed by the reverse water sealing closing mechanism according to the water pressure inside and outside the anti-seepage layer toward the groundwater outlet in the reservoir basin.

[0013] The preferred embodiment of the above scheme is that the one-way filtering and seepage mechanism includes a water supply base hole and a one-way water seepage filter layer group, the water supply base hole is drilled in the foundation of the bottom of the reservoir basin, the one-way water seepage filter layer group is covered on the inner wall of the water supply base hole, and the reverse water sealing closing mechanism is inserted into the water supply base hole covered with the one-way water seepage filter layer group.

[0014] Furthermore, the one-way water seepage filter layer group includes at least a permeable base layer and a reverse filter bag layer, the permeable base layer is solidified on the inner wall of the water transfer base hole, the reverse filter bag layer is solidified on the permeable base layer, and the inner wall of the water transfer base hole is composed of the reverse filter bag layer.

[0015] A preferred embodiment of the above scheme is that the reverse water sealing closing mechanism includes at least a guide water supply pipe and a water sealing closing assembly, and the water sealing closing assembly is arranged at the open upper end of the guide water supply pipe; during operation, the open upper end of the water supply base hole is opened or closed by the guide water supply pipe inserted in the water supply base hole under the cooperation of the water sealing closing assembly and the water pressure inside and outside the anti-seepage layer.

[0016] Furthermore, the guide water pipe is composed of a steel pipe, a plurality of water holes are evenly distributed on the side wall of the steel pipe, and the water sealing closing component is arranged on the open upper end of the steel pipe.

[0017] A preferred embodiment of the above scheme is that the water sealing closing assembly includes a fixed head and a sealing gasket, the sealing gasket is arranged on the open upper end of the steel pipe through the fixed head, and the open upper end of the water delivery base hole is opened or closed by the sealing gasket under the cooperation of the groundwater pressure of the steel pipe and the water pressure of the reservoir basin.

[0018] Wherein, the diameter of the sealing gasket is at least twice as large as the inner diameter of the water delivery base hole.

[0019] Furthermore, there are multiple water supply base holes arranged on the bottom of the reservoir basin, and each of the water supply base holes is evenly distributed in the bottom of the reservoir basin; the inner wall of each of the water supply base holes is covered with a one-way water seepage filter layer group, and each of the water supply base holes is arranged with a reverse water sealing closing mechanism.

[0020] The process method adopts the above arrangement structure to eliminate the groundwater top load of the anti-seepage structure of the entire reservoir basin. The above process method balances the water pressure inside and outside the anti-seepage layer of the reservoir basin by a sliding one-way seepage pressure reduction system arranged on the bottom of the reservoir basin to eliminate the groundwater top load.

[0021] Among them, the sliding one-way seepage pressure reduction system can only be connected one-way toward the inside of the reservoir basin to balance the water pressure inside and outside the anti-seepage layer of the reservoir basin when the water level inside the reservoir basin is lower than the water level outside the reservoir basin.

[0022] Furthermore, when the sliding one-way water seepage and pressure reduction system is set at the bottom of the reservoir basin, the following steps are followed:

[0023] A. Setting a water delivery base hole according to the water permeability of the reservoir basin bottom stratum and drilling the water delivery base hole;

[0024] B. After the water delivery base hole is drilled, the bottom and surrounding of the water delivery base hole are backfilled with permeable base and the filter bag is installed;

[0025] C. Place the steel pipe with water holes in the water delivery base hole;

[0026] D. Install a sealing gasket on the top of the steel pipe;

[0027] E. Use the top fixing head to tightly fix the sealing gasket and the steel pipe to prevent water leakage;

[0028] F. Repeat steps A to E until all water supply base holes are drilled, backfilled, steel pipes installed, and gaskets installed.

[0029] The beneficial effects of the present invention are as follows: the technical solution provided by this application is based on an existing reservoir basin, firstly laying an impermeable layer on the inner wall of the reservoir basin, then adding a sliding one-way seepage and pressure-reducing system, and allowing the pressurized water on both sides of the impermeable layer to flow one-way toward the inner side of the reservoir basin through the sliding one-way seepage and pressure-reducing system. This changes the existing technical measures used to eliminate the groundwater top load by drainage and diversion, such as setting intercepting and drainage corridors at the bottom of the upper reservoir basin, which are labor-intensive, uneconomical, and uncontrollable. This achieves the purpose of effectively lowering the groundwater level and eliminating the top load of groundwater. At this time, when eliminating the groundwater support on the outer side of the anti-seepage layer, the present application can balance the water pressure inside and outside the anti-seepage layer of the reservoir basin through the sliding one-way seepage pressure reduction system installed on the bottom of the reservoir basin to eliminate the groundwater support load. Accordingly, the sliding one-way seepage pressure reduction system can only be connected to the inner side of the reservoir basin in one direction when the water level inside the reservoir basin is lower than the water level outside the reservoir basin to balance the water pressure inside and outside the anti-seepage layer of the reservoir basin. In this way, since the technical solution of the present application only uses the sliding one-way seepage pressure reduction system to input the pressure water outside the anti-seepage layer into the inner side of the reservoir basin in one direction, the purpose of reducing the outer water pressure when the outer groundwater level is higher than the inner storage water level is achieved. This makes the engineering workload of the technical solution of the present application relatively small, the investment cost is relatively low, and the drainage effect is particularly good. In addition, the application adopts the above-mentioned process method compatible with the layout structure, which can significantly shorten the construction period, reduce the engineering workload, and achieve the purpose of reducing investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic cross-sectional view of the arrangement structure for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin according to the present invention, in which the groundwater level is higher than the water level in the reservoir;

[0031] Figure 2 This is a schematic cross-sectional view of the arrangement structure for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin according to the present invention, when the groundwater level is lower than the water level in the reservoir;

[0032] Figure 3 A cross-sectional view of a sliding one-way water seepage and pressure reduction system involved in the arrangement structure for eliminating the groundwater top-supporting load of the whole reservoir basin anti-seepage structure according to the present invention;

[0033] Figure 4 for Figure 3 AA cross-sectional view.

[0034] Marked in the figure are: reservoir basin 1, sliding one-way water seepage and pressure reduction system 2, anti-seepage layer 3, one-way filtering and seepage mechanism 4, reverse water sealing and closing mechanism 5, water supply base hole 6, one-way water seepage filter layer group 7, permeable base layer 8, reverse filter bag 9, guide water supply pipe 10, water sealing and closing component 11, water hole 12, fixed head 13, and sealing gasket 14. DETAILED DESCRIPTION

[0035] like Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 The present invention provides a relatively small engineering workload, relatively low investment cost, and good drainage effect for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin, as well as a process method for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin using the arrangement structure. The arrangement structure for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin includes a reservoir basin 1, characterized in that the arrangement structure also includes a sliding one-way seepage and pressure reduction system 2, an anti-seepage layer 3 is laid on the inner wall of the reservoir basin 1, and the pressure water located inside and outside the anti-seepage layer 3 is one-way communicated toward the inside of the reservoir basin 1 through the sliding one-way seepage and pressure reduction system 2, wherein the anti-seepage layer 3 is an asphalt concrete layer laid on the inner wall of the reservoir basin. The technical solution provided in this application is based on the existing reservoir basin. An anti-seepage layer is first laid on the inner wall of the reservoir basin, and then a sliding one-way seepage and pressure reduction system is added to allow the pressure water located inside and outside the anti-seepage layer to be one-way communicated toward the inside of the reservoir basin through the sliding one-way seepage and pressure reduction system. This changes the existing technology that requires drainage and diversion as the main method for eliminating the supporting load of groundwater: setting interception and drainage corridors at the bottom of the upper reservoir basin, which are large in engineering volume, low in economic efficiency, and uncontrollable in effect, and achieves the purpose of effectively lowering the groundwater level and eliminating the supporting effect of groundwater. At this time, when eliminating the supporting load of groundwater outside the anti-seepage layer, the present application can balance the water pressure inside and outside the anti-seepage layer of the reservoir basin by a sliding one-way seepage pressure reduction system set on the bottom of the reservoir basin to eliminate the supporting load of groundwater. Accordingly, the sliding one-way seepage pressure reduction system can only be connected to the inside of the reservoir basin in one direction when the water level inside the reservoir basin is lower than the water level outside the reservoir basin to balance the water pressure inside and outside the anti-seepage layer of the reservoir basin. In this way, since the technical solution of the present application is only to input the pressure water outside the anti-seepage layer toward the inside of the reservoir basin in a one-way manner through a sliding one-way seepage pressure reduction system, the purpose of reducing the water pressure outside when the outside groundwater level is higher than the inside storage water level is achieved. The engineering volume of the technical solution of the present application is relatively small, the investment cost is relatively low, and the drainage effect is particularly good. In addition, the present application adopts the above-mentioned process method that is compatible with the layout structure, which can also significantly shorten the construction period, reduce the engineering volume, and achieve the purpose of reducing investment costs.

[0036] In the above embodiment, combined with actual production conditions, in order to facilitate construction and installation, the sliding type one-way water seepage and pressure reduction system 2 described in this application includes a one-way filtering water seepage mechanism 4 and a reverse water sealing closing mechanism 5. The one-way filtering water seepage mechanism 4 is embedded in the foundation of the bottom of the reservoir basin. The one-way filtering water seepage mechanism 4 is opened or closed by the reverse water sealing closing mechanism 5 toward the groundwater outlet in the reservoir basin 1 under the coordination of the water pressure inside and outside the anti-seepage layer. At this time, the one-way filtering water seepage mechanism 4 includes a water delivery base hole 6 and a one-way water seepage filter layer group 7. The water delivery base hole 6 is drilled in the foundation of the bottom of the reservoir basin. The one-way water seepage filter layer group 7 is covered on the inner wall of the water delivery base hole 6. The reverse water sealing closing mechanism 5 is inserted into the water delivery base hole 6 covered with the one-way water seepage filter layer group 7. The one-way water seepage filter layer group 7 preferably includes at least a permeable base layer 8 and a reverse filter bag 9. The permeable base layer 8 is fixed to the inner wall of the water supply base hole 6, and the reverse filter bag 9 is fixed to the permeable base layer 8. The inner wall of the water supply base hole 6 is composed of the reverse filter bag. Correspondingly, the reverse water sealing closing mechanism 5 includes at least a guide water supply pipe 10 and a water sealing closing assembly 11. The water sealing closing assembly 11 is arranged at the open upper end of the guide water supply pipe 10. During operation, the open upper end of the water supply base hole 6 is opened or closed by the guide water supply pipe 10 inserted into the water supply base hole 6 under the cooperation of the water sealing closing assembly 11 and the water pressure inside and outside the anti-seepage layer 3. At this time, the guide water supply pipe 10 is preferably composed of a steel pipe with multiple water holes 12 evenly distributed on the side wall of the steel pipe. The water sealing closing assembly 11 is arranged at the open upper end of the steel pipe. The water sealing closing assembly 11 preferably includes a fixed head 13 and a sealing gasket 14. The sealing gasket 14 is arranged on the open upper end of the steel pipe through the fixed head 13. The open upper end of the water supply base hole 6 is opened or closed by the sealing gasket 14 under the cooperation of the groundwater pressure of the steel pipe and the water pressure of the reservoir basin. In order to improve the closing effect, the diameter of the sealing gasket 14 is at least twice the inner diameter of the water supply base hole 6.

[0037] Of course, in order to maximize the effect of eliminating the groundwater top load, the present application arranges multiple water supply base holes 6 on the bottom of the reservoir basin, and each of the water supply base holes 6 is evenly distributed within the bottom of the reservoir basin; the inner wall of each of the water supply base holes 6 is covered with the one-way water seepage filter layer group 7, and each of the water supply base holes 6 is arranged with a reverse water sealing closing mechanism 5. More specifically, when setting up the sliding one-way water seepage pressure reduction system on the bottom of the reservoir basin, the following steps are followed:

[0038] A. Setting a water delivery base hole 6 according to the water permeability of the reservoir basin bottom stratum, and drilling the water delivery base hole 6;

[0039] B. After the water delivery base hole 6 is drilled, the bottom and surrounding of the water delivery base hole 6 are backfilled with a permeable base layer 8 and a filter bag 9 is installed;

[0040] C. Place the steel pipe with the water hole 12 in the water delivery base hole 6;

[0041] D. Install the sealing gasket 14 on the top of the steel pipe;

[0042] E. Use the top fixing head 13 to tightly fix the sealing gasket 14 to the steel pipe to prevent water leakage;

[0043] F. Repeat steps A to E until all the water delivery base holes 6 are drilled, backfilled, steel pipes are installed, and sealing gaskets 14 are installed.

[0044] In summary, the characteristics of the above technical solution provided by this application are:

[0045] 1. Simple components, easy construction, low cost, and can effectively prevent the jacking effect of groundwater and the infiltration of reservoir water;

[0046] 2. It can be used in different stratum conditions, such as bedrock and overburden;

[0047] 3. It is adaptable to various groundwater levels and reservoir water level conditions and is easy to operate.

[0048] By adopting the above-mentioned technical means of this application, a one-way flow device is automatically opened by the water pressure difference, thereby eliminating the groundwater supporting effect of the anti-seepage structure of the entire reservoir basin; it can adapt to any groundwater level changes inside and outside the reservoir, and automatically realize the water-isolating and water-permeable functions.

[0049] Example 1

[0050] The technical solution provided in this application aims to utilize the changes in the reservoir water level during the operation of the upper reservoir and the head difference generated by the surrounding groundwater level, and to set up a set of devices at the bottom of the reservoir that can realize unidirectional flow of water. When the groundwater level is higher than the water level in the reservoir, the device automatically opens due to the water pressure difference, and the groundwater flows into the reservoir basin, eliminating the jacking effect of the groundwater; when the groundwater level is lower than the water level in the reservoir, the device automatically closes due to the water pressure difference, isolating the reservoir water and the groundwater to achieve an anti-seepage effect. The method and device for eliminating the jacking effect of groundwater in the anti-seepage structure of the entire reservoir basin described in this patent refers to: utilizing a device that can realize unidirectional flow of water, under the action of the water pressure difference between the water level in the reservoir and the groundwater level, automatically realizing unidirectional flow of water, thereby achieving the functions of eliminating groundwater jacking and reservoir water seepage. The specific implementation steps are as follows:

[0051] 1. A one-way flow device is installed at the bottom of the anti-seepage structure of the entire reservoir basin.

[0052] A. First, determine the permeability of the stratum at the bottom of the reservoir basin, arrange the installation holes, and drill;

[0053] B. After the drilling is completed, backfill the bottom and surrounding areas of the hole with permeable materials and install the filter bag;

[0054] C. Then, place the permeable flower tube in the hole;

[0055] D. Then, install a sealing gasket on the top of the flower tube;

[0056] E. Then, use the top fixing head to tightly fix the sealing gasket and the flower tube to prevent water leakage;

[0057] F. Repeat steps A to E to install the next device.

[0058] 2. When the water level in the reservoir is higher than the surrounding groundwater level, the water pressure at the top of the reservoir basin is greater than the water pressure at the bottom. The device is closed under the action of downward water pressure and its own weight, achieving the purpose of preventing reservoir water from seepage.

[0059] 3. When the water level in the reservoir is lower than the surrounding groundwater level, the water pressure at the top of the reservoir basin is lower than the water pressure at the bottom. Under the action of the upward water pressure, the device opens, allowing the groundwater outside the reservoir to flow into the reservoir basin, thereby eliminating the groundwater support effect.

[0060] 4. Repeat steps 2 and 3 to enter the next reservoir water change cycle.

Claims

1. A structure for eliminating the groundwater top load of the anti-seepage structure of the entire reservoir basin, comprising a reservoir basin (1), characterized in that: The arrangement structure further comprises a sliding one-way water seepage and pressure reduction system (2), an anti-seepage layer (3) is laid on the inner wall of the water reservoir basin (1), and the pressure water inside and outside the anti-seepage layer (3) is unidirectionally communicated toward the inner side of the water reservoir basin (1) through the sliding one-way water seepage and pressure reduction system (2). Wherein, the anti-seepage layer (3) is an asphalt concrete layer laid on the inner wall of the reservoir basin. The sliding type one-way water seepage pressure reduction system (2) comprises a one-way filtering water seepage mechanism (4) and a reverse water sealing closing mechanism (5). The one-way filtering water seepage mechanism (4) is embedded in the foundation of the bottom of the reservoir basin. The one-way filtering water seepage mechanism (4) is opened or closed by the reverse water sealing closing mechanism (5) in accordance with the water pressure inside and outside the anti-seepage layer. The one-way filtering water seepage mechanism (4) comprises a water delivery base hole (6) and a one-way water seepage filter layer group (7), wherein the water delivery base hole (6) is drilled in the foundation of the bottom of the reservoir basin, the one-way water seepage filter layer group (7) is covered on the inner wall of the water delivery base hole (6), and the reverse water sealing closing mechanism (5) is plugged into the water delivery base hole (6) covered with the one-way water seepage filter layer group (7). The one-way water permeation filter layer group (7) comprises at least a permeable base layer (8) and an anti-filtration bag layer (9), wherein the permeable base layer (8) is fixed on the inner wall of the water delivery base hole (6), and the anti-filtration bag layer (9) is fixed on the permeable base layer (8), and the inner wall of the water delivery base hole (6) is formed by the anti-filtration bag layer. The reverse water sealing closing mechanism (5) comprises at least a guide water pipe (10) and a water sealing closing assembly (11), wherein the water sealing closing assembly (11) is arranged at the open upper end of the guide water pipe (10); during operation, the open upper end of the water delivery base hole (6) is opened or closed by the guide water delivery pipe (10) inserted into the water delivery base hole (6) under the cooperation of the water sealing closing assembly (11) and the water pressure inside and outside the anti-seepage layer (3). The guide water pipe (10) is composed of a steel pipe, and a plurality of water holes (12) are evenly distributed on the side wall of the steel pipe. The water sealing closing component (11) is arranged on the open upper end of the steel pipe. The water sealing closing assembly (11) includes a fixed head (13) and a sealing gasket (14). The sealing gasket (14) is arranged on the open upper end of the steel pipe through the fixed head (13). The open upper end of the water delivery base hole (6) is opened or closed by the sealing gasket (14) under the cooperation of the underground water pressure of the steel pipe and the water pressure of the reservoir basin. The diameter of the sealing gasket (14) is at least twice the inner diameter of the water delivery base hole (6).

2. The arrangement structure for eliminating the groundwater top load of the whole reservoir basin anti-seepage structure according to claim 1 is characterized in that: There are a plurality of water delivery base holes (6) arranged on the bottom of the reservoir basin, and each of the water delivery base holes (6) is evenly distributed in the bottom of the reservoir basin; a one-way water seepage filter layer group (7) is covered on the inner wall of each of the water delivery base holes (6), and a reverse water sealing closing mechanism (5) is arranged in each of the water delivery base holes (6).

3. A process for eliminating the groundwater top load of the entire reservoir basin anti-seepage structure by using the arrangement structure described in claim 2, characterized in that: The process method eliminates the top load of groundwater by balancing the water pressure inside and outside the anti-seepage layer of the reservoir basin through a sliding one-way seepage pressure reduction system (2) arranged on the bottom of the reservoir basin. The sliding one-way water seepage pressure reduction system (2) can only be connected one-way toward the inside of the reservoir basin when the water level inside the reservoir basin is lower than the water level outside the reservoir basin to balance the water pressure inside and outside the anti-seepage layer of the reservoir basin.

4. The process according to claim 3, wherein: When setting up the sliding one-way water seepage and pressure reduction system at the bottom of the reservoir basin, the following steps are followed: A. setting a water delivery base hole (6) according to the water permeability of the reservoir basin bottom stratum, and drilling the water delivery base hole (6); B. After the water delivery base hole (6) is drilled, the bottom and surrounding of the water delivery base hole (6) are backfilled with a permeable base layer (8) and a filter bag (9) is installed; C. Place the steel pipe provided with the water hole (12) in the water delivery base hole (6); D. Install a sealing gasket (14) on the top of the steel pipe; E. Use the top fixing head (13) to tightly fix the sealing gasket (14) and the steel pipe to prevent water leakage; F. Repeat steps A to E until all the water delivery base holes (6) are drilled, backfilled, steel pipes installed, and gaskets (14) are installed.

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