Geomembrane sedimentation self-adaptive device based on pressure balance

Abstract

The utility model discloses a geomembrane settlement self-adaption device based on pressure balance, which comprises at least one settlement self-adaption unit, the settlement self-adaption unit comprises a medium bag and an injection and connection seat, the medium bag is made of elastic and high-pressure-resistant materials, a cavity for accommodating high-pressure media is arranged in the medium bag, and the injection and connection seat is connected with the medium bag. The device is arranged below the geomembrane and above the junction of the bedrock area and the backfill area, one part of the device is located above the bedrock area, the other part of the device is located above the backfill area, and when the backfill area sinks, the medium bag located in the backfill area expands, the medium bag located in the bedrock area is compressed, and the backfill area sinks. Huge shearing stress generated by a hard bed rock area to the geomembrane is counteracted or partially counteracted, so that the problem of leakage of a soft and hard interface caused by tearing of the geomembrane is solved.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, and in particular to a geomembrane settlement adaptive device. Background Technology

[0002] Geomembrane is a new type of engineering seepage control material made of high-molecular polymers. It is lightweight, flexible, easy to construct, has excellent seepage control performance, low cost, and high ductility, and is widely used in reservoir dam seepage control projects. With improvements in geomembrane materials and the maturity of welding processes, the construction quality of large-area geomembrane laying has been guaranteed. However, the rigid connection of the geomembrane has become a key and easily overlooked weak link in seepage control. In recent years, pumped storage power stations in my country have experienced serious leakage problems at the soft and hard interface of their reservoirs, affecting the normal operation of the power station units and causing huge economic losses.

[0003] Settlement of the backfilled foundation often results in geomembranes being subjected to tensile stress that is difficult to weaken, leading to their rupture under immense tensile force. This is especially true at the boundary between the backfilled and bedrock areas. While the bedrock is hard, the backfilled area, despite compaction, is less dense than the original bedrock, making it prone to settlement. This uneven settlement causes uneven deformation of the geomembrane, subjecting it to significant shear stress. Figure 1 This is a schematic diagram of geomembrane use in existing reservoirs. Therefore, the boundary between the backfill area and the bedrock area is a major area prone to geomembrane damage. Geomembrane installation is a concealed project, and geomembranes are typically used for long-term service, making timely and effective intervention difficult after settlement occurs. Therefore, it is necessary to address the problem of geomembrane tearing caused by settlement changes. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model proposes a geomembrane settlement adaptive device based on pressure balance, the technical solution of which is as follows:

[0005] A pressure balance-based geomembrane settlement adaptive device is installed below the geomembrane and above the boundary between the bedrock area and the backfill area. Part of the device is located above the bedrock area, and another part is located above the backfill area. The device includes at least one settlement adaptive unit, which includes a medium bladder and an injection and connection seat.

[0006] The medium capsule is made of elastic and high-pressure resistant material and contains a chamber for containing high-pressure media.

[0007] The injection and connection seat is used to inject high-pressure medium into the medium bladder, and when there are two or more settlement adaptive units, it is used in conjunction with the high-pressure resistant connecting pipe to connect each settlement adaptive unit in series.

[0008] Furthermore, the sedimentation adaptive unit includes a first medium capsule and a second medium capsule, and the sedimentation adaptive unit also includes a connecting pipe.

[0009] The first and second medium capsules have the same structure, with an elliptical or rectangular cross-section, and are arranged side by side axially.

[0010] There are multiple connecting tubes, which are fixedly connected at uniform intervals between the first and second medium bladders along the axial direction of the first and second medium bladders. The chambers of the first and second medium bladders are interconnected through the inner pipes of the multiple connecting tubes.

[0011] The injection and connection seats are fixedly connected to the axial end faces of the first and second media capsules, respectively.

[0012] During installation, the central axis of the settlement adaptive unit coincides with the boundary between the backfill area and the bedrock area. The first medium chamber is located above the backfill area, and the second medium chamber is located above the bedrock area.

[0013] This geomembrane settlement adaptive device with a communicating vessel structure is suitable for engineering applications where the boundary between the backfill area and the bedrock area is long or curved.

[0014] Furthermore, the media capsule of the sedimentation adaptive unit is an integrated media capsule.

[0015] The integrated media capsule is rectangular, with a single chamber and an injection and connection seat fixedly connected to each of its two axial end faces;

[0016] During installation, the axial line of the integrated media bag coincides with the boundary line between the backfill area and the bedrock area (3). Half of the bottom surface of the integrated media bag is located above the backfill area, and the other half of the bottom surface of the integrated media bag is located above the bedrock area.

[0017] The integrated geomembrane settlement adaptive device is suitable for projects where the boundary between the backfill area and the bedrock area is short or the boundary between the backfill area and the bedrock area is straight.

[0018] Furthermore, the high-pressure medium is any one of high-pressure nitrogen, mineral oil, or synthetic hydraulic oil.

[0019] The beneficial technical effects of this utility model are as follows:

[0020] Because the geomembrane settlement adaptive device's medium chamber is made of elastic and high-pressure resistant material, it contains a chamber for containing high-pressure media. The geomembrane settlement adaptive device is located below the geomembrane and above the interface between the bedrock area and the backfill area, with one part above the bedrock area and the other part above the backfill area. When the backfill area settles, the medium chamber located in the backfill area expands, while the medium chamber located in the bedrock area compresses. This offsets or partially offsets the huge shear stress generated by the hard bedrock area on the geomembrane, preventing the geomembrane from being torn and causing leakage problems at the soft-hard interface. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating the use of geomembranes in existing reservoirs.

[0022] Figure 2 This is a schematic diagram of the first embodiment where no settlement occurred;

[0023] Figure 3 for Figure 2 Exploded view;

[0024] Figure 4 This is a schematic diagram illustrating the settlement state in Example 1;

[0025] Figure 5 This is an isometric view of the settlement adaptive device in Example 1;

[0026] Figure 6 This is an isometric view of the settlement adaptive device in Example 2;

[0027] Figure 7 This is a schematic diagram of the state where no settlement occurred in Example 2;

[0028] Figure 8 This is an isometric view of the settlement state in Example 2;

[0029] Figure 9 for Figure 8 Front view

[0030] In the figure, 1 is the geomembrane; 2 is the settlement adaptive unit; 21 is the first medium chamber; 22 is the second medium chamber; 23 is the connecting pipe; 24 is the injection and connection seat; 25 is the integrated medium chamber; 3 is the bedrock area; and 4 is the backfill area. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] The settlement adaptive device can be a single settlement adaptive unit 2 or a combination of multiple settlement adaptive units 2 connected in series. Example 1:

[0033] Please see Figure 2-5 In this embodiment, the settlement adaptive unit 2 is a communicating vessel structure, which includes a first medium bladder 21, a second medium bladder 22, and a communicating tube 23.

[0034] The first medium capsule 21 and the second medium capsule 22 have the same structure, material and specifications. They are made of elastic and high-pressure resistant materials, such as polyurethane rubber, fluororubber, silicone rubber, butyl rubber / halogenated butyl rubber or thermoplastic polyurethane elastomer, or any one or more of these.

[0035] The aforementioned media capsule adopts a multi-layer composite cavity wall structure: from the inside to the outside, the inner layer, also known as the airtight layer, is made of butyl rubber or fluororubber, combined with a self-healing coating, such as polyurethane microcapsules, to achieve self-healing after damage; the pressure-resistant reinforcement layer is embedded with double-layer cross-woven steel wire mesh, which is interwoven to form a mesh skeleton to enhance radial pressure resistance; the outer protective layer is made of aramid fiber woven mesh and polyurethane coating to improve puncture resistance and abrasion resistance.

[0036] The connecting pipe 23 can be a high-pressure resistant rigid pipe or a flexible pipe. Rigid pipes include steel wire reinforced polyurethane composite pipes, which have an inner polyurethane or nylon layer, a middle layer reinforced with high-density steel wire braiding, and an outer layer coated with wear-resistant polyurethane or modified polyolefin. Steel wire wound resin composite pipes have an inner modified polyolefin or nylon layer, a middle layer with a steel wire skeleton embedded through a bidirectional winding process, and an outer layer of wear-resistant resin.

[0037] Hose: such as steel wire reinforced polyurethane hose, its structure is that the inner core is polyurethane, the reinforcing layer is made of steel wire braiding, and the outer layer is covered with a polyurethane protective layer; such as steel wire reinforced nylon hose, its structure is that the inner core is nylon, the reinforcing layer is made of steel wire braiding, and the outer layer is a polyurethane protective layer.

[0038] The first medium capsule 21 and the second medium capsule 22 have elliptical or rectangular cross-sections. Elliptical or rectangular medium capsules are more stable when laid on the foundation than medium capsules of other shapes. There are multiple connecting pipes 23, which are fixedly connected between the first medium capsule 21 and the second medium capsule 22 at uniform intervals along the axial direction of the medium capsule. Both the first medium capsule 21 and the second medium capsule 22 have chambers for containing the medium, and the chambers of the first medium capsule 21 and the second medium capsule 22 are interconnected through the internal pipes of the multiple connecting pipes 23. If the first medium capsule 21 and the second medium capsule 22 are elliptical, the axial direction of the connecting pipe 23 is consistent with the major axis of the ellipse; if the first medium capsule 21 and the second medium capsule 22 are rectangular, the axial direction of the connecting pipe 23 is consistent with the length direction of the rectangle.

[0039] The settlement adaptive unit 2 also includes an injection and connection seat 24. The injection and connection seat 24 is used to inject media into the first medium bladder 21 and the second medium bladder 22, and to connect multiple settlement adaptive units 2 in series. For example, a clamp-type PTFE rubber flexible joint or an elastic shock-absorbing throat-type connection seat may be used. If multiple settlement adaptive units 2 are connected in series, a matching high-pressure resistant connection pipe is required. The connection seats 24 of two adjacent settlement adaptive units 2 are connected by a high-pressure resistant connection pipe, and the connection is made by threaded fitting with a sealing gasket or by a tight-fitting clamp fitting.

[0040] Both the first medium bladder 21 and the second medium bladder 22 are fixedly connected to a connecting seat 24 at both ends of the axial direction. A medium is injected into the chamber through any one of the connecting seats 24. The medium is any one of high-pressure nitrogen, mineral oil or synthetic hydraulic oil.

[0041] In use, the settlement adaptive device is laid along the boundary line between the backfill area and the bedrock area. The axial line of the settlement adaptive device is consistent with the boundary line between the backfill area and the bedrock area. Half of the device is laid in the backfill area and half in the bedrock area. Then, the underlying surface layer is laid, followed by the geomembrane, and then the upper surface layer is laid on the geomembrane. Figure 2-9 (Neither the middle and lower surface layers nor the upper surface layer are shown in the drawing.) After laying the settlement adaptive device and geomembrane, other construction procedures will be carried out.

[0042] In actual engineering projects, the boundary between the backfill area and the bedrock area varies in length, and sometimes it is a straight line and sometimes it is a curve. This embodiment is suitable for projects where the boundary between the backfill area and the bedrock area is long or curved.

[0043] Please see Figure 2 and 4 Working principle: When the backfill area 4 settles, the pressure inside the medium bladder on one side of the backfill area 4 decreases, while the pressure inside the medium bladder on the side of the bedrock area 3 increases. For ease of description, the medium bladder on the side of the backfill area 4 is called the first medium bladder 21, and the medium bladder on the side of the bedrock area 3 is called the second medium bladder 22. As a result, under the action of the pressure difference, the medium in the second medium bladder 22 moves towards the first medium bladder 21, maintaining pressure balance between the two. The result of the medium movement is that the first medium bladder 21 expands and the second medium bladder 22 compresses and shrinks, offsetting or partially offsetting the change in height difference at the interface between the backfill area 4 and the bedrock area 3 caused by the settlement of the backfill area 4. That is, offsetting or partially offsetting the huge shear stress generated by the hard bedrock area 3 on the geomembrane 1, so that the geomembrane will not be torn and the leakage problem at the soft-hard interface will not occur. Example 2:

[0044] Please see Figure 6-9The difference between this embodiment and embodiment 1 is that the settlement adaptive unit 2 is an integral structure, which includes an integral medium bladder 25 and an injection and connection seat 24.

[0045] The integrated media capsule 25 is rectangular and contains a chamber for containing high-pressure media. The chamber is an integral chamber. There are two injection and connection seats 24, which are fixedly connected to the two axial end faces of the integrated media capsule 25. Each end face is provided with one injection and connection seat 24.

[0046] This embodiment is suitable for projects where the boundary between the backfill area 4 and the bedrock area 3 is short or the boundary between the backfill area 4 and the bedrock area 3 is a straight line.

[0047] Please see Figure 7-9 When in use, the axis of the settlement adaptive device is aligned with the boundary line between the backfill area 4 and the bedrock area 3, with half of it resting on the backfill area 4 and the other half on the bedrock area 3. When the backfill area 4 settles, the half of the integrated medium bladder 25 located in the backfill area 4 expands and becomes larger, while the half of the integrated medium bladder 25 located in the bedrock area compresses and becomes smaller.

[0048] Apart from the differences mentioned above, everything else is the same as in Example 1.

[0049] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A geomembrane settlement adaptive device based on pressure balance, characterized in that, Set below the geomembrane (1), above the junction of the bedrock area (3) and the backfill area (4), with a portion above the bedrock area (3) and another portion above the backfill area (4), including at least one settlement adaptive unit (2), the settlement adaptive unit (2) including a medium bladder and an injection and connection seat (24). The medium capsule is made of an elastic and high-pressure resistant material and contains a chamber for containing high-pressure media. The injection and connection seat (24) is used to inject high-pressure medium into the medium bladder, and when there are two or more settlement adaptive units (2), the settlement adaptive units (2) are connected in series with the high-pressure resistant connecting pipe.

2. The geomembrane settlement adaptive device based on pressure balance according to claim 1, characterized in that, The media capsule of the settling adaptive unit (2) includes a first media capsule (21) and a second media capsule (22), and the settling adaptive unit (2) also includes a connecting tube (23); The first medium capsule (21) and the second medium capsule (22) have the same structure and have an elliptical or rectangular cross section. The first medium capsule (21) and the second medium capsule (22) are arranged side by side axially. There are multiple connecting tubes (23), and multiple connecting tubes (23) are fixedly connected at uniform intervals between the first medium bladder (21) and the second medium bladder (22) along the axial direction of the first medium bladder (21) and the second medium bladder (22). The chambers of the first medium bladder (21) and the second medium bladder (22) are interconnected through the inner pipes of the multiple connecting tubes (23). The injection and connection seat (24) is fixedly connected to the axial end faces of the first medium capsule (21) and the second medium capsule (22), respectively; During installation, the central axis of the settlement adaptive unit (2) coincides with the boundary line between the backfill area (4) and the bedrock area (3). The first medium bag (21) is located above the backfill area (4), and the second medium bag (22) is located above the bedrock area (3).

3. The geomembrane settlement adaptive device based on pressure balance according to claim 1, characterized in that, The media capsule of the settling adaptive unit (2) is an integrated media capsule (25); The integrated media capsule (25) is rectangular and the chamber is an integral chamber. An injection and connection seat (24) is fixedly connected to each of its two axial end faces. During installation, the axial line of the integrated media bag (25) coincides with the boundary line between the backfill area (4) and the bedrock area (3). Half of the bottom surface of the integrated media bag (25) is located above the backfill area (4), and the other half of the bottom surface of the integrated media bag (25) is located above the bedrock area (3).

4. The geomembrane settlement adaptive device based on pressure balance according to any one of claims 1-3, characterized in that, The high-pressure medium is any one of high-pressure nitrogen, mineral oil, or synthetic hydraulic oil.

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