Forebay anti-seepage drainage structure with whole reservoir basin anti-seepage function

By setting up a surface anti-seepage structure and a seepage collection mechanism in the reservoir of the pumped storage power station, a self-flow drainage system is formed, which solves the problem of difficulty in seepage and drainage of the front pond, and achieves efficient and safe drainage and reduces investment costs.

CN222120110UActive Publication Date: 2024-12-06POWERCHINA HUADONG ENG CORP LTD
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Patent Information

Application Number
CN202420830435.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-19
Publication Date
2024-12-06
Estimated Expiration
2034-04-19

AI Technical Summary

Technical Problem

In the anti-seepage structure of the pumped storage power station, the seepage in the front pool cannot be discharged through the corridor at the bottom of the storage, and an independent drainage system is required, resulting in high investment and complex construction.

Method used

The surface anti-seepage structure is installed on the reservoir bank, bottom and front pond of the reservoir, including vertical shaft-type inlet/outlet, drainage corridor and connected seepage collection mechanism, using drainage cushion layer, horizontal and longitudinal drainage pipes and guides A self-flow drainage system is formed with the drainage tank to ensure effective drainage of water seepage.

Benefits of technology

It reduces the drainage pressure in the front pool, improves the monitoring accuracy and safety of the anti-seepage structure, simplifies the venting and maintenance process, and significantly reduces investment costs and construction complexity.

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Abstract

The utility model provides a whole reservoir basin anti-seepage forebay anti-seepage drainage structure, a reservoir bank, a reservoir bottom and a forebay of a reservoir are jointly provided with a surface anti-seepage structure, the reservoir bottom of the forebay is provided with a vertical shaft type water inlet / outlet structure, and the lower part of the surface anti-seepage structure is provided with a drainage gallery. The drainage galleries are provided with first drainage galleries communicated with the outside of the reservoir basin at the periphery of the reservoir bottom, the periphery of the top and the periphery of the bottom of the forebay are respectively provided with second drainage galleries and third drainage galleries, and the second drainage galleries are communicated with the first drainage galleries in the same structural layer; and a communicating gallery is arranged on the forebay bank slope section between the third drainage gallery and the second drainage gallery. The drainage galleries on the periphery of the top of the forebay are communicated with a channel for draining seepage water at the bottom of the reservoir to the foundation pit, so that the drainage pressure in the forebay is reduced, and the leakage monitoring accuracy of the anti-seepage structure is also improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of pumped storage power station engineering, and in particular to a forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin. Background Art

[0002] The pumped storage power station reservoir adopts a full reservoir basin anti-seepage structure, and a drainage system is set up at the bottom and around the reservoir. It is generally composed of a drainage corridor and a drainage network connected to it. The corridor is connected to the drainage and traffic corridor or the drainage and traffic tunnel to the low-rise and high-rise parts outside the reservoir to achieve drainage. When the inlet / outlet adopts a vertical shaft inlet / outlet, a deep pit of about 10-20m will be formed at the inlet / outlet. The seepage water in the forebay cannot be discharged through the reservoir bottom corridor, and an independent drainage system needs to be arranged. However, since this part is lower than other parts around the reservoir, to achieve drainage at the bottom of the reservoir, the drainage system of this part must be connected with the drainage system around the reservoir or an independent outlet must be set up. Generally, the investment is high, and the corresponding structure and its construction are relatively complicated. Utility Model Content

[0003] The purpose of the utility model is to provide an anti-seepage drainage structure that can combine the drainage function and functional requirements of the anti-seepage system to ensure the effectiveness of drainage. To this end, the utility model adopts the following technical solutions:

[0004] The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin is provided with a surface anti-seepage structure on the reservoir bank, reservoir bottom and forebay of the reservoir. The reservoir bottom of the forebay is provided with a vertical shaft type water inlet / outlet structure. A drainage gallery is provided at the lower part of the surface anti-seepage structure. The drainage gallery is provided with a first drainage gallery connected to the outside of the reservoir basin around the reservoir bottom. A second drainage gallery and a third drainage gallery are provided around the top and bottom of the forebay respectively. The second drainage gallery is connected to the first drainage gallery in the same structural layer. A connecting gallery is provided on the forebay bank slope section between the third drainage gallery and the second drainage gallery, so as to form a gravity drainage state during the normal operation of the project and cooperate with the equipment to perform an auxiliary drainage state during the emptying and maintenance of the forebay. The reservoir bottom and the forebay are provided with a seepage collection mechanism at the lower part of their surface anti-seepage structure, and the seepage collection mechanism is connected to the drainage gallery.

[0005] Furthermore: the surface anti-seepage structure is provided with a bank panel on the bank, a bottom panel connected to the bank panel is provided on the reservoir bottom, the forepool is provided with a forepool bank slope panel and a forepool bottom panel connected to each other on its bank slope and bottom respectively, and the forepool bank slope panel is connected to the reservoir bottom panel.

[0006] Furthermore: a drainage cushion layer is fully provided at the lower part of the surface anti-seepage structure, and the drainage cushion layer covers the drainage gallery.

[0007] Furthermore: the water seepage collection mechanism is provided with a horizontal drainage flower pipe connected to the drainage gallery in the drainage cushion layer; a guide part is provided on the side of the drainage gallery, and the guide part is provided with a drainage groove on the top side of the drainage gallery, and a longitudinal drainage flower pipe is buried in the drainage groove along the extension direction of the drainage gallery, and the end of the horizontal drainage flower pipe is connected to the longitudinal drainage flower pipe, and a drainage pipe is provided on the side of the drainage gallery, the water inlet of the drainage pipe is connected to the longitudinal drainage flower pipe, and the water outlet of the drainage pipe is connected to the drainage ditch in the drainage gallery.

[0008] Furthermore: the horizontal drainage flower pipe is provided with a first drainage flower pipe in the front pool, and the ends of the first drainage flower pipe are connected to the third drainage gallery on both sides of the vertical shaft type inlet / outlet structure; the horizontal drainage flower pipe is provided with a second drainage flower pipe in the bottom of the reservoir, and the ends of the second drainage flower pipe are connected to the first drainage gallery and the second drainage gallery.

[0009] Furthermore: the guide parts in the first drainage corridor and the third drainage corridor are double-sided structures, and are arranged in the side edges on both sides of the corridor; the guide part in the second drainage corridor is a single-sided structure, and is arranged in the side edge of the second drainage corridor relative to the bottom of the reservoir.

[0010] Furthermore: the outer side of the longitudinal drainage flower pipe is wrapped with a mesh.

[0011] Furthermore: the drainage trough is filled with a sandless concrete drainage body.

[0012] Furthermore: pedestrian steps are arranged at the bottom of the connecting corridor.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model connects the channel for draining the bottom seepage water to the foundation pit through the drainage corridors around the top of the forebay, which not only reduces the drainage pressure in the forebay, but also improves the accuracy of leakage monitoring of the anti-seepage structure; the functional requirements of drainage of the surface anti-seepage structure are reasonably utilized, and the third drainage corridor at the bottom of the forebay is connected with the second drainage corridor at the top of the forebay by using the connecting corridor. Although the corridor at the bottom of the forebay and the connecting corridor are in a water-filled state during operation, since the corridor is located at the lower part of the surface anti-seepage structure, the bottom plates of the drainage corridor at the bottom of the forebay and the drainage corridor at the upper part of the forebay foundation pit are lower than the lowest water level of the reservoir operation, which can ensure the safe operation of the surface anti-seepage structure; during the emptying and maintenance of the forebay, water pump equipment can be used to pump water from the third drainage corridor at the bottom of the forebay, thereby ensuring the safety of the anti-seepage panel during the emptying process and simple maintenance. Compared with the traditional solution that requires draining the drainage corridor at the bottom of the forebay by excavating a drainage tunnel, the investment is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the plane layout of the utility model;

[0016] Figure 2 For this utility model Figure 1 Overall cross-section diagram of

[0017] Figure 3 For this utility model Figure 1 Sectional view at AA in the middle;

[0018] Figure 4 For this utility model Figure 1 Cross-section at the middle BB;

[0019] Figure 5 It is a cross-sectional view of drainage galleries No. 1 and No. 3 of the utility model;

[0020] Figure 6 It is a cross-sectional view of drainage gallery No. 2 of the utility model;

[0021] Figure 7 It is a cross-sectional view of the connecting corridor of the utility model.

[0022] The markings in the attached drawings are: 1-reservoir bank; 101-reservoir bank panel; 2-reservoir bottom; 201-reservoir bottom panel; 3-dividing line; 4-front pool; 401-front pool bank slope panel; 402-front pool bottom panel; 6-stage; 7-shaft type inlet / outlet structure; 8-first drainage gallery; 9-second drainage gallery; 10-third drainage gallery; 11-connecting gallery; 12-drainage cushion layer; 13-horizontal drainage flower pipe; 131-first drainage flower pipe; 132-second drainage flower pipe; 14-longitudinal drainage trough; 15-longitudinal drainage flower pipe; 16-drainage pipe; 17-drainage ditch; 18-pedestrian step. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0024] like Figure 1-7As shown, the forebay anti-seepage drainage structure for the whole reservoir basin is provided with a surface anti-seepage structure on the reservoir bank 1, the reservoir bottom 2 and the forebay 4 of the reservoir. A vertical shaft type water inlet / outlet structure 7 is provided at the reservoir bottom of the forebay 4. A drainage gallery is provided at the lower part of the surface anti-seepage structure. The drainage gallery is provided with a first drainage gallery 8 connected to the outside of the reservoir basin around the reservoir bottom 2. A second drainage gallery 9 and a third drainage gallery 10 are provided around the top and bottom of the forebay 4, respectively. The second drainage gallery 9 and the first drainage gallery 8 are located in the same structural layer, so that the second drainage gallery can be 9 is directly connected with the first drainage corridor 8; since the distance between the forepool 4 and the reservoir is farther than that between the forepool 4 and the reservoir periphery, the second drainage corridor 9 is arranged in a ring line around the forepool 4, and a connecting corridor 11 is arranged between the second drainage corridor 9 and the third drainage corridor 10, and the connecting corridor 11 is located in the bank slope section of the forepool 4. The first drainage corridor 8, the second drainage corridor 9 and the third drainage corridor 10 form a drainage system to form a gravity drainage state during the normal operation of the project, and to cooperate with water pumps and other equipment to perform auxiliary drainage during the emptying and maintenance of the forepool 6.

[0025] In this embodiment, the surface anti-seepage structure is provided with a bank panel 101 on the bank 1, and a bottom panel 201 smoothly connected and transitioned with the bank panel 101 is provided on the reservoir bottom 2. The forepool 4 is provided with a forepool bank slope panel 401 and a forepool bottom panel 402 which are interconnected on its bank slope and bottom respectively, and the forepool bank slope panel 401 is smoothly connected and transitioned with the bottom panel 201.

[0026] like Figure 1 As shown, a dividing line 3 is formed between the reservoir bank 1 and the reservoir bottom 2, and the area where the reservoir bank 1 and the reservoir bottom 2 are located is divided by the dividing line 3, and a stage 6 is formed between the bank slope section of the fore pool 4 and the bottom plate of the fore pool 4, and the bank slope section and the bottom area of ​​the fore pool 4 are divided by the stage 6.

[0027] like Figure 1-7 As shown, the first drainage corridor 8, the second drainage corridor 9, the third drainage corridor 10 and the connecting corridor 11 in this embodiment adopt the same structural form, with the interior being a city gate arch type, the exterior being arranged according to the trench excavation shape, and the top being consistent with the excavation elevation of the reservoir basin.

[0028] like Figure 5-7 As shown, in this embodiment, the reservoir bottom 2 and the forebay 4 are provided with a seepage collection mechanism at the lower part of the surface anti-seepage structure, and the seepage collection mechanism is connected to the drainage gallery. Among them, the lower part of the surface anti-seepage structure is fully provided with a drainage cushion layer 12, which separates the surface anti-seepage structure from the reservoir bottom, and the drainage cushion layer 12 covers the drainage gallery and its top and surrounding areas.

[0029] Specifically, the seepage collection mechanism is provided with a horizontal drainage flower pipe 13 connected to the drainage gallery in the drainage cushion layer 12. Among them, the horizontal drainage flower pipe 13 is provided with a first drainage flower pipe 131 in the front pool 4, and the end of the first drainage flower pipe 131 is connected to the third drainage gallery 10 on both sides of the vertical shaft type inlet / outlet structure 7; the horizontal drainage flower pipe 13 is provided with a second drainage flower pipe 132 in the reservoir bottom 2, and the end of the second drainage flower pipe 132 is connected to the first drainage gallery 8 and the second drainage gallery 9.

[0030] Specifically, a guide portion is provided on the side of the drainage corridor, and a drainage trough 14 is provided on the top side of the drainage corridor. A longitudinal drainage pipe 15 is buried in the drainage trough 14 along the extension direction of the drainage corridor. The end of the horizontal drainage pipe 13 is connected to the longitudinal drainage pipe 15, so that the seepage water collected by the horizontal drainage pipe 13 is guided into the longitudinal drainage pipe 15. A drainage pipe 16 is provided on the side of the drainage corridor, and the water inlet of the drainage pipe 16 is connected to the longitudinal drainage pipe 15, and the water outlet of the drainage pipe 16 is connected to the drainage ditch 17 in the drainage corridor, so that all the collected seepage water can be discharged into the drainage ditch 17.

[0031] Among them, the guide parts in the first drainage corridor 8 and the third drainage corridor 10 are double-sided structures, and are arranged in the side edges on both sides of the corridors; because the side of the second drainage corridor 9 relative to the bottom side of the front pool 4 is adjacent to the bank slope section of the front pool 4, and the bank slope section of the front pool 4 tends to descend, the guide part in the second drainage corridor 9 can be a single-sided structure, and the guide part is arranged in the side of the second drainage corridor 9 relative to the reservoir bottom 2.

[0032] like Figure 5-6 As shown, the seepage water from the reservoir bottom 2 and the surrounding parts of the reservoir bottom of the front pool 4 is collected by the horizontal drainage flower pipe 13, and then discharged to the gallery drainage ditch 17 through the longitudinal drainage flower pipe 15 and the drainage pipe 16. The drainage ditch 14 is filled with a sandless concrete drainage body, so the seepage water near the top of the drainage gallery can be collected by the drainage ditch 14, and then discharged to the gallery drainage ditch 17 through the longitudinal drainage flower pipe 15 and the drainage pipe 16. This can further ensure the overall anti-seepage effect.

[0033] The longitudinal drainage flower pipe 15 is covered with two layers of stainless steel wire mesh with a spacing of 1 mm.

[0034] like Figure 7 As shown, a pedestrian step 18 is provided at the bottom of the connecting corridor 11 to allow people to pass through.

[0035] See also Figure 1-7 When constructing the anti-seepage drainage structure in the reservoir basin, the specific construction steps are as follows:

[0036] S1: After the excavation of the reservoir basin is completed, the foundation pit of the fore pool 4 is excavated at the location of the vertical shaft type water inlet / outlet 7;

[0037] S2: excavate the foundation pit of the first drainage gallery 8 around the reservoir bottom 2, excavate the foundation pits of the second drainage gallery 9 and the third drainage gallery 10 around the top and bottom of the forebay 4, and connect the foundation pit of the second drainage gallery 9 with the foundation pit of the first drainage gallery 8;

[0038] S3: Excavate the connecting corridor 11 foundation pit at the bank slope section of the front pool 4 foundation pit;

[0039] S4: Cast the first drainage gallery 8, the second drainage gallery 9 and the third drainage gallery 10 respectively, and set structural joints for the drainage galleries, set a circle of closed copper water stop in the structural joints, and reserve longitudinal drainage grooves 14 and pre-buried drainage pipes 16;

[0040] S5: Lay the drainage cushion layer 12, bury the horizontal drainage flower pipe 13 in the drainage cushion layer 12, and reserve the top and surrounding areas of the first drainage gallery 8, the second drainage gallery 9 and the third drainage gallery 10;

[0041] S6: Install the longitudinal drainage flower pipe 15 in the side of the drainage gallery, firmly connect the longitudinal drainage flower pipe 15 with the drainage pipe 16 and the horizontal drainage flower pipe 13, and pour sandless concrete in the longitudinal drainage groove 14;

[0042] S7: Laying a drainage cushion layer 12 on the top and surrounding area of ​​the drainage gallery;

[0043] S8: Construction surface anti-seepage structure.

[0044] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principle and essence of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. A forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin, wherein a surface anti-seepage structure is provided on the reservoir bank (1), the reservoir bottom (2) and the forebay (4) of the reservoir, and a vertical shaft type water inlet / outlet structure (7) is provided on the reservoir bottom of the forebay (4). Features: A drainage gallery is arranged at the bottom of the surface anti-seepage structure, wherein a first drainage gallery (8) is arranged around the reservoir bottom (2), a second drainage gallery (9) and a third drainage gallery (10) are arranged around the top and bottom of the forebay (4), respectively, the second drainage gallery (9) is connected to the first drainage gallery (8) in the same structural layer, and a connecting gallery (11) is arranged at the bank slope section of the forebay (4) between the third drainage gallery (10) and the second drainage gallery (9); The reservoir bottom (2) and the forebay (4) are provided with seepage collection mechanisms at the lower part of their surface anti-seepage structures, and the seepage collection mechanisms are connected to the drainage gallery.

2. The forebay anti-seepage drainage structure for the whole reservoir basin according to claim 1, Features: The surface anti-seepage structure comprises a bank panel (101) arranged on the bank (1), a bottom panel (201) connected to the bank panel (101) arranged on the bottom (2), and a forebay bank slope panel (401) and a forebay bottom panel (402) connected to each other are arranged on the bank slope and bottom of the forebay (4), respectively, and the forebay bank slope panel (401) is connected to the bottom panel (201).

3. The forebay anti-seepage drainage structure for the whole reservoir basin anti-seepage according to claim 1, Features: A drainage cushion layer (12) is arranged all over the lower part of the surface anti-seepage structure, and the drainage cushion layer (12) covers the drainage gallery.

4. The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin according to claim 3, Features: The water seepage collection mechanism is provided with a horizontal drainage flower pipe (13) in communication with the drainage gallery in the drainage cushion layer (12); a guide portion is provided on the side of the drainage gallery, and a drainage groove (14) is provided on the guide portion on the top side of the drainage gallery; a longitudinal drainage flower pipe (15) is buried in the drainage groove (14) along the extension direction of the drainage gallery; the end of the horizontal drainage flower pipe (13) is connected to the longitudinal drainage flower pipe (15); a drainage pipe (16) is provided on the side of the drainage gallery; the water inlet of the drainage pipe (16) is connected to the longitudinal drainage flower pipe (15), and the water outlet of the drainage pipe (16) is connected to the drainage ditch (17) in the drainage gallery.

5. The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin according to claim 4, Features: The horizontal drainage flower pipe (13) is provided with a first drainage flower pipe (131) in the front pool (4), and the ends of the first drainage flower pipe (131) are connected to the third drainage gallery (10) on both sides of the vertical shaft type water inlet / outlet structure (7); the horizontal drainage flower pipe (13) is provided with a second drainage flower pipe (132) in the reservoir bottom (2), and the ends of the second drainage flower pipe (132) are connected to the first drainage gallery (8) and the second drainage gallery (9).

6. The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin according to claim 4, Features: The guide parts in the first drainage gallery (8) and the third drainage gallery (10) are double-sided structures and are arranged in the side edges of both sides of the gallery; the guide part in the second drainage gallery (9) is a single-sided structure and is arranged in the side edge of the second drainage gallery (9) opposite to the reservoir bottom (2).

7. The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin according to claim 4, Features: The outer side of the longitudinal drainage flower pipe (15) is wrapped with a mesh.

8. The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin according to claim 4, Features: The drainage trough (14) is filled with a sandless concrete drainage body.

9. The forebay anti-seepage drainage structure for anti-seepage of the entire reservoir basin according to claim 1, Features: A pedestrian step (18) is arranged at the bottom of the connecting corridor (11).