Reservoir bottom geomembrane drainage repairing structure

Abstract

The utility model discloses a reservoir bottom geomembrane drainage repairing structure which comprises an anti-seepage structure, an outer cofferdam and an inner cofferdam, the outer cofferdam and the inner cofferdam are located above the anti-seepage structure, and a foundation pit defined by the outer cofferdam is divided into a geomembrane repairing area and a shallow water working area through the inner cofferdam. The first drainage system, the second drainage system, the total drainage system and the water containing bucket are located in the shallow water working area, a drainage bin is arranged in the geomembrane repairing area and used for absorbing reverse seepage water of the geomembrane repairing area, a water inlet of the first drainage system is connected with the drainage bin, and a water outlet of the first drainage system is connected with the water containing bucket to drain the seepage water of the geomembrane repairing area. A water inlet of the second drainage system is located in the shallow water working area to drain seepage water in the shallow water working area, and a water outlet of the second drainage system is connected with the water containing barrel. Under the condition that the reservoir is not emptied, the underwater repairing work of the geomembrane at the bottom of the reservoir can be completed.

Description

Technical Field

[0001] The utility model relates to a reservoir bottom geomembrane drainage repair structure, which is suitable for a reservoir bottom geomembrane anti-seepage structure repair project in which only a separated geotextile is arranged on the reservoir bottom for surface protection. Background Art

[0002] At present, with the rapid development of pumped storage power stations, more and more reservoir projects use geomembranes for anti-seepage at the bottom of the reservoir, and basically use geomembranes separated from the membrane cloth, and the upper part is generally covered with sandbags arranged at intervals. After long-term operation, the geomembrane is damaged and needs to be repaired. The current repair method is to empty the reservoir for systematic inspection and repair. In addition to the direct economic losses caused by emptying the reservoir, the operation is stopped during the entire repair period, there is a significant loss of operating income, and the cost is huge.

[0003] Compared with reinforced concrete panels and asphalt concrete panels, which have a certain ability to resist damage from external physical factors, geomembranes are more susceptible to damage caused by external factors, and the damage is more obvious. Through the research and judgment of the reservoir bottom drainage system and the monitoring system, the approximate damage site of the geomembrane can generally be determined, and the damage site can be accurately located by further inspection with underwater robots or divers. In this case, the utility model provides a structure that can be repaired with water and its repair method, which has significant significance and value in reducing the repair cost, avoiding shutdown operation, and participating in the power allocation of the power system normally. However, the welding repair of the geomembrane must ensure that the welding surface of the geomembrane is in a dry state, which is the main reason why the underwater repair of the geomembrane cannot be achieved at present. Under normal leakage conditions, the lower part of the geomembrane is also in a state of water. Although the water can be discharged in time under the action of the drainage system, according to the analysis of some normal operating engineering monitoring data, it is normal for the water pressure under the membrane to be 0.1MPa or even higher. Repair operations involving water must build a cofferdam and drain the water from the cofferdam. At this time, the geomembrane at the damaged part will have the problem of reverse seepage, and this reverse seepage cannot be drained naturally. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a reservoir bottom geomembrane drainage repair structure, which can complete the underwater repair work of the reservoir bottom geomembrane without emptying the reservoir.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a geomembrane drainage and repair structure at the bottom of a reservoir, comprising an anti-seepage structure, an outer weir and an inner cofferdam, wherein the outer weir and the inner cofferdam are located above the anti-seepage structure, the inner cofferdam divides a foundation pit surrounded by the outer weir into a geomembrane repair area and a shallow water working area, and further comprises a first drainage system, a second drainage system, a total drainage system and a water bucket located in the shallow water working area, the geomembrane repair area is provided with a drainage bin for absorbing reverse seepage in the geomembrane repair area, the water inlet of the first drainage system is connected to the drainage bin, and the water outlet is connected to the water bucket to discharge seepage in the geomembrane repair area, the water inlet of the second drainage system is located in the shallow water working area to discharge seepage in the shallow water working area, the water outlet is connected to the water bucket, the water inlet of the total drainage system is connected to the water bucket, and the water outlet is connected to the outside of the outer weir.

[0007] Furthermore, the outer weir adopts a cylindrical structure with a flexible water pressure water-stopping structure on the bottom, and the inner cofferdam is surrounded by clay.

[0008] Furthermore, the first drainage system is provided with a first self-priming pump, a first water suction pipe and a first drainage pipe, one end of the first water suction pipe is connected to the drainage bin, and the other end is connected to the first self-priming pump, one end of the first drainage pipe is connected to the first self-priming pump, and the other end is connected to the water bucket; the second drainage system is provided with a second self-priming pump, a second water suction pipe and a second drainage pipe, one end of the second water suction pipe is connected to the shallow water working area, and the other end is connected to the second self-priming pump, one end of the second drainage pipe is connected to the second self-priming pump, and the other end is connected to the water bucket; the main drainage system is provided with a multi-stage high-pressure submersible pump and a main drainage pipe connected to the multi-stage high-pressure submersible pump, the multi-stage high-pressure submersible pump is placed in the water bucket, and the water is discharged to the outside of the outer weir through the main drainage pipe; the shallow water working area is provided with a storage rack, and the first self-priming pump and the second self-priming pump are both located on the storage rack.

[0009] Furthermore, the anti-seepage structure is composed of a transition material layer, a cushion material layer, and a geomembrane from bottom to top. The drainage bin passes through the cushion material layer to the bottom and is located in the transition material layer. The top elevation of the drainage bin is consistent with the geomembrane laying elevation. The bottom is backfilled with a transition material repair layer, and the periphery is backfilled with a cushion material repair layer.

[0010] Furthermore, the drainage bin is a steel box structure, the lower part of which is a water inlet end provided with a filtering system, and the top of the drainage bin is provided with a drainage pipe, which is circular and has a certain length, and a thread is provided on the outer wall.

[0011] Furthermore, the filtration system is divided into three layers, from bottom to top, including the lower filter plate, medium-coarse biochemical filter cotton, and isolation plate. The lower filter plate is composed of a dense steel wire mesh with a hole spacing of 1mm and a porous steel plate. The porous steel plate is inverted at the bottom of the drainage bin through a slot set at the bottom of the drainage bin. The isolation plate is a porous steel plate and is an integral structure with the box body.

[0012] Furthermore, the top of the drainage bin body is arc-shaped all around, and anchoring devices are evenly arranged for mechanical anchoring in the anti-seepage structure.

[0013] Furthermore, the anchoring device includes an anchor bolt arranged on the top of the box body and an annular rubber gasket under the membrane, a geomembrane, an annular rubber gasket on the membrane, and an annular anchoring steel plate arranged in sequence from bottom to top, and finally is pressurized and anchored by tightening the anchor nut to form an anti-seepage anchoring structure.

[0014] Furthermore, after the repair and anchoring are completed, the drain pipe is closed with a closing nut. The inner wall of the top of the closing nut is hemispherical. A layer of SR plastic filler is placed in advance, and then a water-stop rubber ball with a diameter slightly smaller than the inner diameter of the closing nut is placed in it, and it is squeezed and closed by the anchoring force.

[0015] Furthermore, the annular rubber gasket under the membrane, the annular rubber gasket on the membrane, and the annular anchoring steel plate are all provided with preset bolt holes and drainage pipe holes according to the positions and sizes corresponding to the anchor bolts and drainage pipes at the top of the drainage bin.

[0016] The beneficial effects of the utility model are:

[0017] The repair structure of the utility model solves the technical problem that the geomembrane welding cannot be performed due to reverse leakage under the membrane when the reservoir is repaired without draining the reservoir and the cofferdam scheme is adopted. The repair method solves the problem of economic losses and overall shutdown of the power station caused by draining the reservoir for geomembrane repair, which not only has significant economic benefits, but also has significant social benefits, with huge benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall structural diagram of an embodiment of the utility model.

[0019] Figure 2 This is a detailed diagram of the drainage system of an embodiment of the utility model.

[0020] Figure 3 This is a detailed diagram of the repair structure of an embodiment of the utility model (after repair).

[0021] Figure 4 This is a detailed structural diagram of the drainage bin of an embodiment of the utility model (after repair).

[0022] Figure 5 This is a detailed view of the drainage bin closing nut according to an embodiment of the present utility model.

[0023] Figure 6 This is a detailed diagram of the geomembrane-drainage bin anchoring in an embodiment of the utility model.

[0024] Figure 7 This is a top view of the drainage trough according to an embodiment of the present utility model.

[0025] Figure 8 This is a detailed diagram of the annular rubber gasket under the membrane of an embodiment of the utility model.

[0026] Fig. 9 This is a detailed diagram of the annular rubber gasket on the membrane of an embodiment of the utility model.

[0027] Fig.10 This is a detailed view of the annular anchor steel plate according to an embodiment of the utility model.

[0028] In the figure: 1. Anti-seepage structure; 2. Outer weir; 3. Inner cofferdam; 4. Water bucket; 5. No. 1 drainage system; 6. Second drainage system; 7. Main drainage system; 8. Drainage bin; 9. Storage rack; 10. Transition material layer; 11. Cushion material layer; 12. Geomembrane; 13. Transition material repair layer; 14. Cushion material repair layer; 15. Annular rubber gasket under membrane; 16. Annular rubber gasket on membrane; 17. Annular anchor steel plate; 18. Anchor nut; 19. Anchor bolt; 20. , bolt hole; 21, drain pipe hole; 51, first self-priming pump; 52, first suction pipe; 53, first drain pipe; 61, second self-priming pump; 62, second suction pipe; 63, second drain pipe; 71, multi-stage high-pressure submersible pump; 72, main drain pipe; 81, box body; 82, lower filter plate; 83, medium-coarse biochemical filter cotton; 84, isolation plate; 85, anchoring device; 86, drain pipe; 87, closing nut; 88, water-stop rubber ball; 89, SR plastic filler. DETAILED DESCRIPTION

[0029] The following is a further description of the structures involved in the present invention or the technical terms used. These descriptions are merely examples of how the present invention is implemented and do not constitute any limitation to the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left" and "right" indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1 As shown, a geomembrane drainage and repair structure for a reservoir bottom includes an anti-seepage structure 1, an outer weir 2 and an inner cofferdam 3. The outer weir 2 and the inner cofferdam 3 are located above the anti-seepage structure 1. The inner cofferdam 3 divides the foundation pit surrounded by the outer weir 2 into a geomembrane repair area and a shallow water working area. It also includes a first drainage system 5, a second drainage system 6, a main drainage system 7 and a water bucket 4 located in the shallow water working area. The geomembrane repair area is provided with a drainage bin 8 for absorbing reverse seepage in the geomembrane repair area. The water inlet of the first drainage system 5 is connected to the drainage bin 8, and the water outlet is connected to the water bucket 4 to discharge the seepage in the geomembrane repair area. The water inlet of the second drainage system 6 is located in the shallow water working area to discharge the seepage in the shallow water working area, and the water outlet is connected to the water bucket 4. The water inlet of the main drainage system 7 is connected to the water bucket 4, and the water outlet is connected to the outside of the outer weir 2.

[0033] The outer weir 2 is a cylindrical structure with a flexible hydraulic water stop structure on the bottom. The inner cofferdam 3 is made of clay enclosure to further enclose the geomembrane repair area. The inner cofferdam 3 must ensure that the repaired area is completely free of external water during the repair period. To achieve this, after the clay enclosure is completed, clay can be further used to cover the outside, and a circle of water-absorbing material can be set on the inside, and replaced in time.

[0034] The first drainage system 5 is the drainage system of the geomembrane repair area, which mainly removes the accumulated water formed by the reverse seepage of water under the reservoir bottom membrane due to the presence of reservoir water. To achieve this purpose, the first drainage system 5 is connected to the drainage tank 8, which is arranged in the anti-seepage structure 1 of the geomembrane repair area. After the reverse seepage water penetrates into the geomembrane repair area, it is pumped away in time, so that the reverse seepage water can be ensured to be always under the geomembrane.

[0035] The second drainage system 6 is a drainage system for water seepage from the outer cofferdam, which ensures that the shallow water working area is in a low water level state. On the one hand, it provides the necessary environment for the staff to work, and on the other hand, it reduces the anti-seepage pressure of the inner cofferdam 3.

[0036] The main drainage system 7 pumps the water in the water tank 4 to the outside of the peripheral weir 2.

[0037] As an optional embodiment, Figure 2As shown, the first drainage system 5 is provided with a first self-priming pump 51, a first water suction pipe 52 and a first drainage pipe 53. One end of the first water suction pipe 52 is connected to the drainage tank 8, and the other end is connected to the first self-priming pump 51. One end of the first drainage pipe 53 is connected to the first self-priming pump 51, and the other end is connected to the water storage tub 4; the second drainage system 6 is provided with a second self-priming pump 61, a second water suction pipe 62 and a second drainage pipe 63. One end of the second water suction pipe 62 is connected to the shallow water working area, and the other end is connected to the second self-priming pump 61. One end of the second drainage pipe 63 is connected to the second self-priming pump 61, and the other end is connected to the water storage tub 4; the main drainage system 7 is provided with a multi-stage high-pressure submersible pump 71 and a main drainage pipe 72 connected to the multi-stage high-pressure submersible pump 71. The multi-stage high-pressure submersible pump 71 is placed in the water storage tub 4, and the water is discharged to the outside of the peripheral weir 2 through the main drainage pipe 72; the shallow water working area is provided with a storage rack 9, and the first self-priming pump 51 and the second self-priming pump 61 are both located on the storage rack 9.

[0038] As an optional embodiment, Figure 3 As shown, the anti-seepage structure 1 is composed of a transition material layer 10, a cushion material layer 11, and a geomembrane 12 from bottom to top. The drainage bin 8 passes through the cushion material layer 11 to the bottom and is located in the transition material layer 10. The top elevation of the drainage bin 8 is consistent with the laying elevation of the geomembrane 12. The bottom is backfilled with a transition material repair layer 13, and the periphery is backfilled with a cushion material repair layer 14.

[0039] As an optional embodiment, Figure 4 As shown, the drainage tank 8 is a steel box 81 structure, the lower part of which is a water inlet end provided with a filtering system to prevent reverse water from bringing in a large amount of silt, and to protect the lower structural layer while pumping water to prevent the loss of fine particles. A drainage pipe 86 is provided on the top of the box 81 of the drainage tank 8, and the drainage pipe 86 is circular, has a certain length, and has threads on the outer wall.

[0040] As an optional embodiment, the filtration system at the water inlet end of the lower part of the drainage bin 8 is divided into three layers, which are the lower filter plate 82, the medium-coarse biochemical filter cotton 83, and the isolation plate 84 from bottom to top. The lower filter plate 82 is composed of a dense mesh steel wire mesh with a hole spacing of about 1 mm and a porous steel plate, and the porous steel plate is inverted at the bottom of the drainage bin 8 through a slot set at the bottom of the drainage bin 8. The isolation plate 84 is a porous steel plate, which is an integral structure with the bin body 81 of the drainage bin, which can increase the rigidity of the bin body. When in use, first put in the medium-coarse biochemical filter cotton 83, lay a layer of dense mesh steel wire mesh, and then cover the porous steel plate.

[0041] As an optional embodiment, Figure 4 , Figure 7 As shown, the drainage bin 8 is permanently placed below the geomembrane 12 in the geomembrane repair area. In order to avoid damage to the geomembrane 12 by the drainage bin 8, the top of the drainage bin box 81 is arc-shaped and anchoring devices 85 are evenly arranged for mechanical anchoring.

[0042] As an optional embodiment, Figure 6 As shown, the anchoring device 85 includes an anchor bolt 19 arranged on the top of the drainage bin box 81 and an annular rubber gasket 15 under the membrane, a geomembrane (plain membrane) 12, an annular rubber gasket 16 on the membrane, and an annular anchoring steel plate 17 arranged in sequence from bottom to top, and finally tightened by an anchor nut 18 for pressurized anchoring to form an anti-seepage anchoring structure. In order to increase the anti-seepage effect, a layer of SR plastic filler is arranged between the annular anchoring steel plate 17, the annular rubber gasket 16 under the membrane, and the geomembrane (plain membrane) 12, and the contact surface is painted with SR primer.

[0043] As an optional embodiment, Figure 4 , Figure 5 As shown, after the repair and anchoring are completed, the drainage pipe 86 of the drainage chamber 8 is closed with a closing nut 87. The inner wall of the top of the closing nut 87 is a hemispherical shape, in which a layer of SR plastic filler 89 is placed in advance, and then a water-stop rubber ball 88 with a diameter slightly smaller than the inner diameter of the closing nut 87 is placed, and the sealing is squeezed by the anchoring force.

[0044] As an optional embodiment, Figure 8 , Fig. 9 , Fig.10 As shown, the annular rubber gasket 15 under the membrane, the annular rubber gasket 16 on the membrane, and the annular anchoring steel plate 17 are all provided with preset bolt holes 20 and drainage pipe holes 21 according to the positions and sizes corresponding to the anchor bolts 19 and the drainage pipe 86 at the top of the drainage bin 8.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. The geomembrane drainage repair structure at the bottom of the reservoir is characterized by: The invention comprises an anti-seepage structure (1), an outer weir (2) and an inner cofferdam (3), wherein the outer weir (2) and the inner cofferdam (3) are located above the anti-seepage structure (1), and the inner cofferdam (3) divides the foundation pit surrounded by the outer weir (2) into a geomembrane repair area and a shallow water working area. The invention also comprises a first drainage system (5), a second drainage system (6), a main drainage system (7) and a water storage bucket (4) located in the shallow water working area. The geomembrane repair area is provided with a drainage bin (8) for absorbing reverse seepage water in the geomembrane repair area. The water inlet of the first drainage system (5) is connected to the drainage bin (8), and the water outlet is connected to the water storage bucket (4) to discharge seepage water in the geomembrane repair area. The water inlet of the second drainage system (6) is located in the shallow water working area to discharge seepage water in the shallow water working area, and the water outlet is connected to the water storage bucket (4). The water inlet of the main drainage system (7) is connected to the water storage bucket (4), and the water outlet is connected to the outer side of the outer weir (2).

2. The reservoir bottom geomembrane drainage repair structure according to claim 1 is characterized in that: The outer weir (2) is a cylindrical structure with a flexible water pressure water stop structure on the bottom surface, and the inner cofferdam (3) is formed by surrounding clay.

3. The reservoir bottom geomembrane drainage repair structure according to claim 1 is characterized in that: The first drainage system (5) is provided with a first self-priming pump (51), a first water suction pipe (52) and a first drainage pipe (53); one end of the first water suction pipe (52) is connected to the drainage tank (8), and the other end is connected to the first self-priming pump (51); one end of the first drainage pipe (53) is connected to the first self-priming pump (51), and the other end is connected to the water storage bucket (4); the second drainage system (6) is provided with a second self-priming pump (61), a second water suction pipe (62) and a second drainage pipe (63); one end of the second water suction pipe (62) is connected to the shallow water working area, and the other end is connected to the second The first self-priming pump (51) and the second self-priming pump (61) are connected to each other, one end of the second drainage pipe (63) is connected to the second self-priming pump (61), and the other end is connected to the water storage barrel (4); the main drainage system (7) is provided with a multi-stage high-pressure submersible pump (71) and a main drainage pipe (72) connected to the multi-stage high-pressure submersible pump (71); the multi-stage high-pressure submersible pump (71) is placed in the water storage barrel (4), and water is discharged to the outside of the peripheral weir (2) through the main drainage pipe (72); the shallow water working area is provided with a storage rack (9), and the first self-priming pump (51) and the second self-priming pump (61) are both located on the storage rack (9).

4. The reservoir bottom geomembrane drainage repair structure according to claim 1 is characterized in that: The anti-seepage structure (1) comprises, from bottom to top, a transition material layer (10), a cushion material layer (11), and a geomembrane (12); the drainage bin (8) passes through the cushion material layer (11) to the bottom and is located in the transition material layer (10); the top elevation of the drainage bin (8) is consistent with the laying elevation of the geomembrane (12); the bottom is backfilled with a transition material repair layer (13), and the periphery is backfilled with a cushion material repair layer (14).

5. The reservoir bottom geomembrane drainage repair structure according to claim 1 is characterized in that: The drainage chamber (8) is a steel box (81) structure, the lower part of which is a water inlet end provided with a filtering system, and the top of the drainage chamber (8) is provided with a drainage pipe (86), which is circular and has a certain length, and has a thread on the outer wall.

6. The reservoir bottom geomembrane drainage repair structure according to claim 5 is characterized in that: The filtering system is divided into three layers, which are, from bottom to top, a lower filter plate (82), a medium-coarse biochemical filter cotton (83), and an isolation plate (84). The lower filter plate (82) is composed of a dense steel wire mesh with a hole spacing of 1 mm and a porous steel plate. The porous steel plate is inverted at the bottom of the drainage bin (8) through a slot provided at the bottom of the drainage bin (8). The isolation plate (84) is a porous steel plate and is an integral structure with the box body (81).

7. The reservoir bottom geomembrane drainage repair structure according to claim 5 is characterized in that: The top of the drainage bin box (81) is arc-shaped all around, and anchoring devices (85) are evenly arranged to mechanically anchor it in the anti-seepage structure (1).

8. The reservoir bottom geomembrane drainage repair structure according to claim 7 is characterized in that: The anchoring device (85) comprises an anchor bolt (19) arranged on the top of the box body (81) and an annular rubber gasket (15) below the membrane, a geomembrane (12), an annular rubber gasket (16) above the membrane, and an annular anchoring steel plate (17) arranged in sequence from bottom to top, and finally is tightened by an anchor nut (18) for pressurized anchoring to form an anti-seepage anchoring structure.

9. The reservoir bottom geomembrane drainage repair structure according to claim 5, characterized in that: After the repair and anchoring are completed, the drain pipe (86) is sealed with a sealing nut (87). The inner wall of the top of the sealing nut (87) is a hemispherical shape. A layer of SR plastic filler (89) is placed in advance, and then a water-stop rubber ball (88) with a diameter slightly smaller than the inner diameter of the sealing nut (87) is placed in it, and the sealing is squeezed by the anchoring force.

10. The reservoir bottom geomembrane drainage repair structure according to claim 8, characterized in that: The annular rubber gasket (15) below the membrane, the annular rubber gasket (16) above the membrane, and the annular anchoring steel plate (17) are all provided with bolt holes (20) and drainage pipe holes (21) in accordance with the positions and sizes corresponding to the anchoring bolts (19) at the top of the drainage bin (8) and the drainage pipe (86).

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