Pressure relief structure for seepage prevention of horizontal geomembrane in karst reservoir area
By adopting the pressure relief structure of the upper pipe, lower pipe, water intercept ring and base in the horizontal geomembrane anti-seepage system in the Karst reservoir area, the problem of blockage and maintenance difficulties of drainage layer is solved, and the timely discharge of liquid and gas is achieved. The convenience of repair improves the stability of the anti-seepage layer.
Patent Information
- Application Number
- CN202421117625.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-22
AI Technical Summary
In the prior art, the drainage layer of the horizontal anti-seepage system in the Karst reservoir area is easily blocked, which leads to difficulty in repair and affects the stability of the geomembrane. It is easy to damage during maintenance, affecting the overall performance of the anti-seepage layer.
The upper and lower pipes are connected to the water surface through karst holes, combined with the water cut-off ring and the base to form a pressure relief structure to ensure the timely discharge of liquid and gas, and there is no need to destroy the composite geomembrane during repair, reducing the anti-seepage layer of maintenance The impact of
It effectively avoids damage to the geomembrane top support, simplifies the maintenance process, improves the stability and repair convenience of the anti-seepage layer, and reduces damage to the anti-seepage layer.
Smart Images
Figure CN222294858U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water conservancy projects, in particular to a pressure relief structure for anti-seepage of horizontal geomembrane in karst reservoir areas. Background Art
[0002] Transforming closed karst depressions into natural reservoirs through anti-seepage treatment is of great significance in solving the problem of production and domestic water in water-scarce areas.
[0003] The anti-seepage treatment methods for karst reservoir bottom include horizontal anti-seepage and vertical anti-seepage. Horizontal anti-seepage mainly uses composite geomembrane as the anti-seepage material. Since the karst strata are interconnected, changes in surface and groundwater outside the reservoir anti-seepage system will also affect the anti-seepage geomembrane in the reservoir area. When the pressure under the membrane is large and the liquid and gas cannot be discharged in time, the composite geomembrane will be damaged and unstable.
[0004] The horizontal anti-seepage in the prior art adopts different functional layers, such as anti-seepage layer, cushion layer, drainage layer, etc., which work together to achieve the purpose of stable anti-seepage in the reservoir area. This leads to a large number of layers, and the specific functions and requirements of each layer are different, the construction process is relatively complex, and the stability after long-term operation is relatively poor. The groundwater drainage layer in the prior art is composed of a composite geotextile drainage net, gravel, water collection blind ditch, and drainage pipe. The structural design is complex. After long-term operation, due to the accumulation of fine particles, the drainage layer is prone to blockage, and water and gas cannot be discharged in time, affecting the stability of the geomembrane. In addition, since the drainage layer is arranged under the anti-seepage layer, if the drainage layer is blocked or damaged and needs to be repaired, the upper anti-seepage layer will also be damaged. Therefore, it is difficult to repair the drainage layer after it is blocked or damaged. Utility Model Content
[0005] The technical problem to be solved by the utility model is: in order to solve the problem that the drainage layer is difficult to repair after being blocked and the anti-seepage layer is easily damaged, the utility model provides a pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir areas to solve the above problem.
[0006] The utility model solves the technical problem by adopting the following technical solution: a pressure relief structure for horizontal geomembrane waterproofing in karst reservoir area, comprising an upper pipe, a lower pipe, a water cut-off ring and a base, wherein the upper pipe is connected with the karst hole through the lower pipe, the lower pipe is fixed in the base, the water cut-off ring is sleeved on the outer wall of the lower pipe and buried in the base, the base is connected with an anti-seepage layer around, and the top of the upper pipe is higher than the designed water level of the reservoir.
[0007] Preferably, a portion of the top end of the upper pipe that is higher than the designed water level of the reservoir is provided with an opening.
[0008] Preferably, the distance from the top of the upper pipe to the designed water level of the reservoir is greater than 0.5 m.
[0009] Preferably, the anti-seepage layer comprises a ballast layer, an upper cushion layer, a composite geomembrane and a lower cushion layer which are arranged in sequence from top to bottom.
[0010] Preferably, the portion of the composite geomembrane connected to the base is buried in the base.
[0011] Preferably, the base adopts a reinforced concrete structure.
[0012] Preferably, the upper tube and the lower tube are both steel tubes.
[0013] Preferably, the lower tube is a straight tube or a curved tube.
[0014] The beneficial effect of the utility model is that an upper pipe, a lower pipe, a water cut-off ring and a base are provided, and the karst holes below the geomembrane are directly connected to the air on the water surface through the upper pipe and the lower pipe. When the hydraulic pressure or gas pressure under the membrane is relatively large, the liquid and gas are discharged in time to avoid the geomembrane being lifted up and causing damage. When repairing the upper pipe and the lower pipe, the base is first removed, and the base is poured after the repair is completed. There is no need to break the geomembrane, which avoids damage to the geomembrane during maintenance and reduces the impact of the maintenance operation on the overall anti-seepage layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0016] Figure 1 This is a structural schematic diagram of a first embodiment of a pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir areas according to the utility model;
[0017] Figure 2 It is a structural schematic diagram of a second embodiment of the utility model, a pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir areas.
[0018] Figure numerals: 1. upper pipe; 2. lower pipe; 3. water cut-off ring; 4. base; 5. karst hole; 6. reservoir design water level; 7. opening; 8. weight material layer; 9. upper cushion layer; 10. composite geomembrane; 11. lower cushion layer. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.
[0021] like Figure 1 As shown, the utility model provides an embodiment 1 of a pressure relief structure for horizontal geomembrane waterproofing in karst reservoir areas, comprising an upper pipe 1, a lower pipe 2, a water cut-off ring 3 and a base 4, the upper pipe 1 is connected to the karst hole 5 through the lower pipe 2, that is, the karst hole 5 below the composite geomembrane 10 is directly connected to the atmosphere on the water surface through the upper pipe 1 and the lower pipe 2, the lower pipe 2 is fixed in the base 4, the water cut-off ring 3 is sleeved on the outer wall of the lower pipe 2 and buried in the base 4, the base 4 is connected with an anti-seepage layer all around, and the top of the upper pipe 1 is higher than the designed water level 6 of the reservoir.
[0022] An opening 7 is provided at the top of the upper pipe 1 which is higher than the designed water level 6 of the reservoir. On the one hand, the water or gas below the geomembrane 10 can be pressed into the lower pipe 2 and the upper pipe 1 when the pressure is relatively high, and then discharged into the reservoir from the top of the upper pipe 1 to achieve pressure relief. On the other hand, it can also prevent debris in the reservoir from falling into the upper pipe 1 and causing pipeline blockage.
[0023] The distance from the top of the upper pipe 1 to the designed water level 6 of the reservoir is greater than 0.5 m, so that there is enough space for arranging multiple openings 7 at the part of the top of the upper pipe extending out of the water surface, so that the total area of the multiple openings 7 can meet the discharge requirements of water or gas when the upper pipe 1 is depressurized.
[0024] The anti-seepage layer comprises a ballast layer 8, an upper cushion layer 9, a composite geomembrane 10 and a lower cushion layer 11 which are arranged in sequence from top to bottom.
[0025] The part of the composite geomembrane 10 connected to the base 4 is buried in the base 4, so that the base 4 can be tightly combined with the anti-seepage layer to form a closed anti-seepage system, thereby preventing water under the membrane from leaking from the joint between the base 4 and the anti-seepage layer.
[0026] The base 4 adopts a reinforced concrete structure, and the lower pipe 2 is fixed by the reinforced concrete structure to prevent the lower pipe 2 from being displaced during long-term use. When repairing the lower pipe 2, the reinforced concrete structure can be destroyed to repair the lower pipe 2 without damaging the composite geomembrane 10. After the lower pipe 2 is repaired, the base 4 can be restored by pouring concrete again, ensuring that the structural strength before and after the repair can meet the use requirements. There is no need to dismantle the composite geomembrane 10, which avoids damage to the composite geomembrane during maintenance and reduces the impact of the maintenance operation on the overall anti-seepage layer.
[0027] Both the upper pipe 1 and the lower pipe 2 are steel pipes, and the lower pipe 2 is a straight pipe. When the karst hole 5 to be connected is located below the base 4 or the karst hole 5 is a vertical hole, a straight pipe is used as the lower pipe 2. The lower end of the lower pipe 2 is connected to the karst hole 5 located below the base 4, and the upper end of the lower pipe 2 is sealed and connected to the upper pipe 1 through a flange, so that the upper pipe 1 can be vertically connected to the karst hole 5 through the vertical straight lower pipe 2.
[0028] like Figure 2 As shown, the utility model also provides a second embodiment of the pressure relief structure for horizontal geomembrane waterproofing in karst reservoir areas, which differs from the first embodiment in that the lower pipe 2 is a curved pipe. When the karst hole 5 to be connected is located on the side of the base 4 or the karst hole 5 is a transverse hole, a curved pipe is used as the lower pipe 2, and one end of the lower pipe 2 is bent and connected to the karst hole 5 located on the side of the base 4, while the other end of the lower pipe 2 is sealed and connected to the upper pipe 1 through a flange, so that the upper pipe 1 can be laterally connected to the karst hole 5 through the bent lower pipe 2.
[0029] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above are only preferred implementation methods of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.
Claims
1. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir areas, characterized by: The invention comprises an upper pipe (1), a lower pipe (2), a water cut-off ring (3) and a base (4); the upper pipe (1) is connected to a karst hole (5) through the lower pipe (2); the lower pipe (2) is fixed in the base (4); the water cut-off ring (3) is sleeved on the outer wall of the lower pipe (2) and buried in the base (4); an anti-seepage layer is connected around the base (4); and the top of the upper pipe (1) is higher than the designed water level (6) of the reservoir.
2. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area according to claim 1, characterized in that: An opening (7) is provided at the top of the upper pipe (1) at a portion higher than the designed water level (6) of the reservoir.
3. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area according to claim 1, characterized in that: The distance from the top of the upper pipe (1) to the designed water level (6) of the reservoir is greater than 0.5 m.
4. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area according to claim 1, characterized in that: The anti-seepage layer comprises a ballast layer (8), an upper cushion layer (9), a composite geomembrane (10) and a lower cushion layer (11) which are arranged in sequence from top to bottom.
5. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area as claimed in claim 4, characterized in that: The portion of the composite geomembrane (10) connected to the base (4) is buried in the base (4).
6. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area according to claim 1, characterized in that: The base (4) adopts a reinforced concrete structure.
7. A pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area according to claim 1, characterized in that: The upper tube (1) and the lower tube (2) are both steel tubes.
8. The pressure relief structure for horizontal geomembrane anti-seepage in karst reservoir area according to claim 1, characterized in that: The lower tube (2) is a straight tube or a curved tube.