Anchoring anti-seepage structure for connecting reservoir bottom geomembrane and reservoir periphery interface

Abstract

The utility model discloses an anchoring anti-seepage structure for connecting a reservoir bottom geomembrane and a reservoir periphery interface, which comprises a reservoir bottom geomembrane layer, and the reservoir periphery interface is a structural joint surface between a connecting plate with a foundation seated on a backfill body and a drainage gallery with the foundation seated on bedrock; the filler is arranged on the upper portion of the structural joint face, the top of the filler is sealed through the anti-seepage cover piece, and the reservoir bottom geomembrane layer covers the upper portion of the anti-seepage cover piece. An anti-seepage structure is arranged on the upper portion of the reservoir bottom geomembrane layer and located above the anti-seepage cover piece, and the two sides of the upper surface of the anti-seepage structure diffuse outwards to form a gentle slope aproll structure. According to the anchoring anti-seepage structure for connecting the reservoir bottom geomembrane and the reservoir periphery interface, water flow at the position of the structural joint face is guided to the periphery to protect the staggered slab structural joint face, and therefore reservoir leakage caused by damage of the reservoir bottom geomembrane is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydropower engineering, and specifically relates to an anchoring anti-seepage structure connecting a geomembrane at the bottom of a reservoir and an interface around the reservoir. Background Art

[0002] The reservoir of a pumped storage power station is located at a high altitude, with little natural water or runoff, and has high requirements for anti-seepage. Due to the advantages of simple construction, good anti-seepage performance, and relatively low cost, geomembranes have been widely used in water conservancy (reservoir reinforcement) and municipal environmental protection (landfill) projects. However, in the construction of pumped storage power stations, due to the large number of concrete structures at the bottom of the reservoir, wide three-dimensional cross-operation, and complex geomembrane connection and anchoring conditions, its anti-seepage, safety and durability are difficult to guarantee, and it has not been widely used in pumped storage power stations.

[0003] Existing pumped storage power stations that use geomembranes for anti-seepage generally adopt the anti-seepage type of "concrete panels around the reservoir + geomembrane at the bottom of the reservoir", and there are excavation areas and backfill areas at the bottom of the reservoir. Among them, the bottom of the concrete panel in the excavation area is connected to the geomembrane by a concrete structure with a foundation on the bedrock, and the bottom of the concrete panel of the dam in the backfill area is connected to the geomembrane by a concrete structure with a foundation on a deep backfill body. There is a structural seam at the interface between these two structures. According to the application experience of existing engineering anti-seepage geomembranes, the anti-seepage fixed connection around the geomembrane is often the weakest link in the geomembrane anti-seepage structure that is most susceptible to damage or leakage. China's utility model patent authorization announcement number CN203514260U discloses a geomembrane anchor anti-seepage structure that adopts the anchoring type of "anchoring ditch + bolt mechanical connection", but does not involve the anchoring connection at the interface between the geomembrane at the bottom of the reservoir and the concrete structure around the reservoir. Due to the staggered structure at the interface between the two concrete structures, the concentrated flow of downstream water to the staggered structure surface can easily cause the geomembrane to tear along the seam surface. At the same time, the different strengths of the underlying foundations of the two concrete structures lead to large differences in uneven settlement in the later stage. The geomembrane connected to its surface is prone to tensile shear failure, which leads to reservoir leakage. The anchor connection at the interface between the geomembrane at the bottom of the reservoir and the concrete structure around the reservoir needs to be urgently resolved. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide an anchored anti-seepage structure connecting the geomembrane at the bottom of the reservoir and the interface around the reservoir. It is suitable for connecting the geomembrane at the bottom of the reservoir to several concrete structures with large differences in foundation settlement at the same time. It can protect the seams of the staggered structures by diverting the water flow at the structural joints to the surrounding areas, thereby avoiding reservoir leakage caused by damage to the geomembrane at the bottom of the reservoir.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An anchored anti-seepage structure connecting a reservoir bottom geomembrane and the interface around the reservoir, comprising a reservoir bottom geomembrane layer, and the interface around the reservoir is a structural seam surface between a connection plate with a foundation located on a backfill body and a drainage gallery with a foundation located on bedrock. Its structural features are: fillers are arranged on the upper part of the structural seam surface, the top of the fillers is closed by an anti-seepage cover sheet, and the reservoir bottom geomembrane layer covers the upper part of the anti-seepage cover sheet; an anti-seepage structure is arranged on the upper part of the reservoir bottom geomembrane layer, and the anti-seepage structure is located above the anti-seepage cover sheet, and both sides of the upper surface of the anti-seepage structure spread outward to form a gentle slope water dispersion structure.

[0007] The filler generally adopts plastic filler, which includes SR and GB. At present, SR plastic filler is widely used. The anti-seepage cover generally adopts EPDM rubber protective cover, which is commonly used by two manufacturers, SR and GB. SR anti-seepage cover is commonly used in engineering. The geomembrane layer at the bottom of the reservoir is laid loosely, and the geomembrane layer at the bottom of the reservoir serves as the first anti-seepage layer, and the anti-seepage structure serves as the second anti-seepage layer. The anchored anti-seepage structure of the utility model, in which the geomembrane at the bottom of the reservoir is connected to the interface around the reservoir, is provided with filler at the upper part of the interface between the two structures, and the top is closed with an anti-seepage cover. When uneven settlement occurs in the drainage corridor and the connection plate foundation, the filler flows into the structural joint surface of the two structures under the action of water pressure, playing a role of sealing and auxiliary anti-seepage. The anti-seepage structure is arranged at the staggered position of the two structures and around the anti-seepage cover, which can divert water flow to the periphery of the structural joint surface to protect the staggered structural joint surface, thereby avoiding reservoir leakage caused by damage to the geomembrane at the bottom of the reservoir.

[0008] Preferably, the anti-seepage structure includes a geomembrane bagged river sand layer, a closed-cell foam board arranged on the surface of the geomembrane bagged river sand layer, and a geomembrane layer A covering the upper part of the closed-cell foam board, wherein the geomembrane bagged river sand layer is arranged on the surface of the geomembrane layer at the bottom of the reservoir above the anti-seepage cover. The A geomembrane layer is laid loosely, and the geomembrane bagged river sand layer is backfilled at the staggered position of the two structures and around the anti-seepage cover to reserve settlement and raise the staggered structure, thereby diverting water flow to the periphery of the seam surface of the staggered structure. The closed-cell foam board can level and buffer the surface of the sandbag, and protect the upper A geomembrane layer from being broken by coarse particles in the lower sandbag, thereby avoiding reservoir leakage caused by damage to the geomembrane.

[0009] Preferably, the distances between the outermost layer of the geomembrane bagged river sand layer and the structural seam surface on both sides along the width direction are greater than 1 m.

[0010] Preferably, the distances between both sides of the A geomembrane layer in the width direction and the outermost layer of the geomembrane bagged river sand layer are greater than 0.5 m.

[0011] Preferably, the A geomembrane layer extends to both sides of the geomembrane bagged river sand layer and is welded to the geomembrane layer at the reservoir bottom to form a whole.

[0012] Specifically, geotextiles are provided on the top of the A geomembrane layer and the geomembrane layer at the reservoir bottom.

[0013] Preferably, the top corner where the drainage gallery is connected to the connecting plate is a rounded corner.

[0014] Specifically, the structural seam surface is filled with foam.

[0015] Specifically, a cushion material is provided at the bottom of the connecting plate.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The anchored anti-seepage structure of the utility model, which connects the reservoir bottom geomembrane with the reservoir periphery interface, diverts the water flow at the structural seam surface to the periphery to protect the staggered structural seam surface, thereby avoiding reservoir leakage caused by damage to the reservoir bottom geomembrane.

[0018] 2. The anchored anti-seepage structure of the utility model connecting the geomembrane at the bottom of the reservoir and the interface around the reservoir has a simple structure, economical cost, good adaptability to uneven foundation settlement, and good anti-seepage effect. It is suitable for the anchoring of the boundary surface of the geomembrane peripheral connection structure with different underlying foundation strengths, and has good technical and economic promotion value for the anti-seepage project of the entire reservoir basin where the geomembrane at the bottom of the reservoir is connected to the boundary of various types of concrete structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of an anchoring anti-seepage structure for connecting a reservoir bottom geomembrane with a reservoir periphery interface.

[0020] In the figure:

[0021] 1-drainage corridor, 2-connecting plate, 3-cushion material, 4-filling material, 5-anti-seepage cover, 6-anti-seepage structure, 61-geomembrane bagged river sand layer, 62-closed-cell foam board, 63-A geomembrane layer, 7-structural joint surface, 8-reservoir bottom geomembrane layer, 9-geotextile. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0023] like Figure 1As shown, this embodiment provides an anchored anti-seepage structure connecting the geomembrane at the bottom of the reservoir and the interface around the reservoir, including a geomembrane layer 8 at the bottom of the reservoir, and the interface around the reservoir is a structural joint surface 7 between a connection plate 2 with a foundation located on the backfill body and a drainage gallery 1 with a foundation located on the bedrock, and a cushion material 3 is arranged at the bottom of the connection plate 2. Filler 4 is arranged on the upper part of the structural joint surface 7, and the top of the filler 4 is closed by an anti-seepage cover sheet 5, and the geomembrane layer 8 at the bottom of the reservoir covers the upper part of the anti-seepage cover sheet 5. An anti-seepage structure 6 is arranged on the upper part of the geomembrane layer 8 at the bottom of the reservoir, and the anti-seepage structure 6 is located above the anti-seepage cover sheet 5. Both sides of the upper surface of the anti-seepage structure 6 spread outward to form a gentle slope dispersion structure. The geomembrane layer 8 at the bottom of the reservoir serves as the first anti-seepage layer, and the anti-seepage structure 6 serves as the second anti-seepage layer. The anti-seepage structure 6 includes a geomembrane bagged river sand layer 61, a closed-cell foam board 62 arranged on the surface of the geomembrane bagged river sand layer 61, and an A geomembrane layer 63 covering the upper part of the closed-cell foam board 62. The geomembrane bagged river sand layer 61 is arranged on the surface of the reservoir bottom geomembrane layer 8 above the anti-seepage cover sheet 5. The A geomembrane layer 63 extends to both sides of the geomembrane bagged river sand layer 61 and is welded to the reservoir bottom geomembrane layer 8 to form an anti-seepage whole. The reservoir bottom geomembrane layer 8 and the A geomembrane layer 63 are both loosely laid, and geotextiles 10 are provided on the top of the A geomembrane layer 63 and the reservoir bottom geomembrane layer 8.

[0024] Filler 4 is arranged on the upper part of the connection interface between the drainage gallery 1 and the connection plate 2. When uneven settlement occurs in the foundation, the filler 4 can flow into the structural joint surface 7 to stop water, and the top of the filler 4 is closed with an anti-seepage cover sheet 5. The top corners of the drainage gallery 1 are rounded, and the structural joint surface 7 connecting the drainage gallery 1 and the connection plate 2 is filled with a foam agent. The geomembrane bag river sand layer 61 is backfilled with a range greater than 1m on both sides of the structural joint surface 7 to reserve settlement and raise the staggered structure, and divert the water flow to the periphery of the staggered structure joint surface 7. A closed-cell foam board 62 is arranged on the upper part of the geomembrane bag river sand layer 61 to level and buffer the geomembrane bag river sand layer 61. The upper part of the closed-cell foam board 62 is covered with a geomembrane layer A 63, and its coverage range exceeds 0.5m on both sides of the geomembrane bag river sand layer 61.

[0025] Compared with the geomembrane anchoring structure commonly used in pumped storage power stations, the anchoring structure of the utility model is simple, economical in cost, has good adaptability to uneven foundation settlement, and has good anti-seepage effect. It is suitable for the boundary surface anchoring of geomembrane peripheral connection structures with different underlying foundation strengths, and has good technical and economic promotion value for the whole reservoir basin anti-seepage project where the geomembrane at the bottom of the reservoir is connected to the boundary of various types of concrete structures.

[0026] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. An anchored anti-seepage structure connecting a reservoir bottom geomembrane and a reservoir periphery interface, comprising a reservoir bottom geomembrane layer (8), the reservoir periphery interface being a structural joint surface (7) between a connection plate (2) whose foundation is located on a backfill body and a drainage gallery (1) whose foundation is located on bedrock; characterized in that: A filler (4) is arranged on the upper part of the structural seam surface (7), the top of the filler (4) is sealed by an anti-seepage cover sheet (5), and the reservoir bottom geomembrane layer (8) covers the upper part of the anti-seepage cover sheet (5); An anti-seepage structure (6) is arranged on the top of the geomembrane layer (8) at the bottom of the reservoir. The anti-seepage structure (6) is located above the anti-seepage cover sheet (5). Both sides of the upper surface of the anti-seepage structure (6) spread outward to form a gentle slope water dispersion structure.

2. The anchored anti-seepage structure connecting the reservoir bottom geomembrane and the reservoir periphery interface according to claim 1, characterized in that: The anti-seepage structure (6) comprises a geomembrane bagged river sand layer (61), a closed-cell foam board (62) arranged on the surface of the geomembrane bagged river sand layer (61), and a geomembrane layer A (63) covering the upper part of the closed-cell foam board (62); the geomembrane bagged river sand layer (61) is arranged on the surface of the geomembrane layer (8) at the reservoir bottom above the anti-seepage cover sheet (5).

3. The anchoring anti-seepage structure connecting the reservoir bottom geomembrane and the reservoir periphery interface according to claim 2 is characterized by: The distances between the outermost layer of the geomembrane bagged river sand layer (61) and the structural seam surface (7) on both sides along the width direction are greater than 1 m.

4. The anchoring anti-seepage structure for connecting the reservoir bottom geomembrane with the reservoir periphery interface according to claim 2, characterized in that: The distances between the two sides of the A geomembrane layer (63) along the width direction and the outermost layer of the geomembrane bagged river sand layer (61) are both greater than 0.5 m.

5. The anchoring anti-seepage structure connecting the reservoir bottom geomembrane and the reservoir periphery interface according to claim 2, characterized in that: The A geomembrane layer (63) extends to both sides of the geomembrane bagged river sand layer (61) and is welded to the reservoir bottom geomembrane layer (8) to form a whole.

6. The anchoring anti-seepage structure for connecting the reservoir bottom geomembrane with the reservoir periphery according to claim 5, characterized in that: The A geomembrane layer (63) and the reservoir bottom geomembrane layer (8) are both provided with geotextiles (9) on top.

7. The anchoring anti-seepage structure for connecting the reservoir bottom geomembrane with the reservoir periphery interface according to claim 1, characterized in that: The top corner where the drainage gallery (1) is connected to the connection plate (2) is a rounded corner.

8. The anchoring anti-seepage structure for connecting the reservoir bottom geomembrane with the reservoir periphery interface according to claim 1, characterized in that: The structural seam surface (7) is filled with a foam agent.

9. The anchoring anti-seepage structure for connecting the reservoir bottom geomembrane with the reservoir periphery interface according to claim 1, characterized in that: A cushion material (3) is arranged at the bottom of the connecting plate (2).

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