Whole-reservoir basin bottom emptying structure
By pre-burying drainage pipes in the reservoir bottom corridor and setting up drainage tunnels at the bottom of the reservoir, the problem of the reservoir capacity below the sand-blocking embankment elevation was solved, realizing the safe discharge of the reservoir capacity and improving the seepage prevention capacity of the seepage prevention layer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-31
AI Technical Summary
In existing technologies, the reservoir capacity below the elevation of the sand-blocking embankment cannot be emptied through the water conveyance and power generation system, resulting in the ineffective discharge of reservoir capacity between the bottom seepage prevention layer and the surrounding panels.
Drainage pipes are pre-embedded in the reservoir bottom corridor structure, and drainage holes are set up at the bottom of the reservoir. Water below the elevation of the sand-blocking embankment is discharged to the drainage holes at the bottom of the reservoir through the drainage pipes and then discharged through the drainage holes. At the same time, a second anchoring ditch is set up around the drainage pipes to improve the seepage prevention capacity.
It has enabled the effective emptying of the reservoir below the elevation of the sand-blocking embankment, improved the seepage prevention capacity of the bottom seepage prevention layer, ensured the safe discharge of the reservoir capacity, and ensured the structural safety and reliability.
Smart Images
Figure CN224063374U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of water conservancy and hydropower facilities, specifically relating to a full reservoir bottom venting structure. Background Technology
[0002] With the vigorous development of new energy sources, pumped storage power stations have experienced explosive growth. During the construction of pumped storage power stations, a bottom seepage barrier is typically installed at the bottom of the entire reservoir basin for seepage prevention. This bottom seepage barrier is connected to the surrounding slabs via a bottom corridor. The bottom corridor includes the passageway itself and an outer concrete structure. The passageway also serves as a maintenance access route for the entire reservoir basin. Increasingly, pumped storage reservoirs are adopting a full-basin solution with geomembrane bottom seepage prevention. Considering the need to empty the reservoir during maintenance of the geomembrane during operation, most of the reservoir's capacity can be released to the lower reservoir or downstream via a water conveyance and power generation system. However, a sand-trapping sill is typically installed before the intake, usually around 1.2 meters high. The reservoir capacity below the sand-trapping sill elevation cannot be released via the water conveyance and power generation system. Utility Model Content
[0003] In view of the existing technical problems, this utility model aims to provide a full-basin bottom emptying structure, which can solve the technical problem of how to empty the reservoir capacity below the elevation of the sand-blocking embankment in the prior art.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A full-basin venting structure includes a bottom impermeable layer, a perimeter panel, and a bottom corridor connecting the bottom impermeable layer and the perimeter panel. Its structural features include a bottom drainage hole connected to the bottom corridor. The bottom corridor contains a drainage pipe, the upper end of which extends upwards to the top of the bottom corridor, and the lower end of which extends into the bottom drainage hole.
[0006] Drainage pipes can be made of seamless stainless steel, and their diameter can be determined based on the required drainage scale and emptying time of the reservoir bottom. The reservoir bottom impermeable layer and the surrounding slab are connected by a reservoir bottom corridor, which includes a passageway and an outer concrete structure. The passageway serves as a maintenance access route for the entire reservoir basin. By pre-embedding drainage pipes within the reservoir bottom corridor structure and constructing drainage holes, water below the sediment trap elevation can be drained through the pipes to the drainage holes and then discharged. Additionally, seepage water from beneath the impermeable layer membrane can also be drained through the passageway to the drainage holes and discharged.
[0007] Preferably, the upper end of the drain pipe is provided with a protective cover, which has a grid pattern. The grid pattern on the protective cover intercepts impurities such as sludge in the water, allowing water below the elevation of the sand retaining wall to drain smoothly and preventing blockage of the drain pipe.
[0008] Preferably, the diameter of the grille holes on the protective cover is no greater than 80mm.
[0009] Specifically, the bottom of the protective cover is anchored to the top of the storage corridor. Bolts can be used for this anchoring connection.
[0010] Preferably, the seepage-proof layer at the bottom of the reservoir is made of geomembrane.
[0011] Specifically, a first anchoring trench is provided at the top of the reservoir bottom corridor. The first anchoring trench is located between the upper end of the drainage pipe and the reservoir bottom seepage prevention layer, and the geomembrane in the reservoir bottom seepage prevention layer is anchored to the first anchoring trench.
[0012] Preferably, a second anchoring trench is provided at the connection between the upper end of the drainage pipe and the top of the reservoir bottom corridor, and the geomembrane in the reservoir bottom seepage barrier layer extends to the top of the reservoir bottom corridor and is anchored in the second anchoring trench. To ensure the integrity of the geomembrane seepage prevention in the reservoir bottom seepage barrier layer, a second anchoring trench is set around the drainage pipe to anchor the geomembrane to the perimeter of the drainage pipe, thereby improving the seepage prevention capacity of the reservoir bottom seepage barrier layer.
[0013] Preferably, the drainage pipe wall located in the passageway at the bottom of the reservoir is provided with an outer concrete layer. The drainage pipe wall is protected by the outer concrete layer.
[0014] Preferably, the lower end of the drain pipe is provided with a maintenance valve and a working valve, with the maintenance valve located inside the working valve. The maintenance valve and working valve are used for maintenance and control of the drain pipe's discharge rate.
[0015] Preferably, there are two drainage holes at the bottom of the reservoir, each connected to a passageway at the bottom of the reservoir; there are also two drainage pipes, each corresponding to one of the two drainage holes at the bottom of the reservoir. This correspondence between the drainage pipes and the drainage holes facilitates control over the drainage volume.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] 1. The full reservoir bottom venting structure of this utility model, by pre-embedding drainage pipes in the reservoir bottom corridor structure and setting up reservoir bottom drainage holes, allows water below the elevation of the sand-blocking embankment to be discharged through the drainage pipes to the reservoir bottom drainage holes and then discharged through the reservoir bottom drainage holes.
[0018] 2. In the full-basin drainage structure of this utility model, water seeping under the membrane of the bottom seepage prevention layer can also be discharged to the bottom drainage hole through the channel of the bottom corridor and then discharged through the bottom drainage hole.
[0019] 3. The full-basin bottom venting structure of this utility model sets up a second anchoring trench around the drainage pipe to anchor the geomembrane to the perimeter of the drainage pipe, thereby improving the seepage prevention capacity of the bottom seepage prevention layer. Attached Figure Description
[0020] Figure 1 This is a schematic cross-sectional view of the full-basin bottom venting structure of this utility model.
[0021] In the figure
[0022] 1-Drainage bottom corridor; 101-Passage; 102-Outer concrete; 2-First anchoring trench; 3-Drainage hole at the bottom of the reservoir; 4-Drainage bottom seepage prevention layer; 5-Survey perimeter panel; 6-Second anchoring trench; 7-Drainage pipe; 8-Second phase concrete; 9-Protective cover; 10-Outer concrete layer; 11-Inspection valve; 12-Working valve. Detailed Implementation
[0023] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.
[0024] like Figure 1As shown, the full-basin venting structure provided in this embodiment includes a bottom drainage hole 3, a bottom seepage-proof layer 4, a perimeter panel 5, and a bottom corridor 1 connecting the bottom seepage-proof layer 4 and the perimeter panel 5. The bottom corridor 1 includes a channel 101 and an outer concrete 102 disposed outside the channel 101. The outer concrete 102 is connected to the bottom seepage-proof layer 4 and the perimeter panel 5 on both sides, respectively. The bottom drainage hole 3 is connected to the channel 101 of the bottom corridor 1. A drainage pipe 7 is installed inside the bottom corridor 1. The drainage pipe 7 is made of 304 stainless steel seamless pipe. The upper end of the drainage pipe 7 extends upward to the top of the bottom corridor 1, and the lower end of the drainage pipe 7 turns within the channel 101 of the bottom corridor 1 and extends into the bottom drainage hole 3. The wall of the drainage pipe 7 located within the channel 101 of the bottom corridor 1 is provided with an outer concrete layer 10, which protects the wall of the drainage pipe 7. The lower end of the drain pipe 7 is equipped with a maintenance valve 11 and a working valve 12. The maintenance valve 11 is located inside the working valve 12. The maintenance valve 11 and the working valve 12 are used for maintenance and control of the discharge of the drain pipe 7. The upper end of the drain pipe 7 is equipped with a protective cover 9, which is made of metal. The protective cover 9 has grid holes with a diameter not exceeding 80mm. By setting up the protective cover 9, sludge and other impurities in the water entering the drain pipe 7 can be intercepted on the outside of the protective cover 9. The pipe diameter of the drain pipe 7, the height of the protective cover 9, and the outer diameter of the protective cover 9 are all determined according to the scale of drainage required at the bottom of the reservoir. The top of the drain pipe 7 is surrounded by secondary concrete 8, which is fine aggregate concrete. The bottom of the protective cover 9 is anchored to the secondary concrete 8 with bolts. The reservoir bottom seepage barrier layer 4 comprises, from bottom to top, a three-dimensional composite drainage net, a 1.5mm thick HDPE geomembrane, geotextile, and a 0.3m thick geotextile sandbag facing layer, each geotextile sandbag weighing 30kg. A first anchoring trench 2 is provided at the top of the outer concrete 102 of the reservoir bottom corridor 1. This first anchoring trench 2 is located between the upper end of the drainage pipe 7 and the reservoir bottom seepage barrier layer 4, and the geomembrane within the reservoir bottom seepage barrier layer 4 is anchored to this first anchoring trench 2. A second anchoring trench 6 is provided at the connection between the upper end of the drainage pipe 7 and the top of the outer concrete 102 of the reservoir bottom corridor 1. The geomembrane within the reservoir bottom seepage barrier layer 4 extends to the top of the outer concrete 102 of the reservoir bottom corridor 1 and is anchored to this second anchoring trench 6.
[0025] The reservoir bottom impermeable layer 4 and the reservoir perimeter panel 5 are connected by a reservoir bottom corridor 1, which serves as a maintenance access for the entire reservoir basin. By pre-embedding drainage pipes 7 within the corridor 1 and constructing drainage holes 3, water below the sand-trapping embankment elevation is drained through the drainage pipes 7 to the drainage holes 3, thus emptying the reservoir. Additionally, seepage water from under the geomembrane of the impermeable layer 4 can also be drained through the corridor 1 to the drainage holes 3. To ensure the integrity of the geomembrane impermeability within the impermeable layer 4, a second anchoring trench 6 is installed around the drainage pipes 7 to anchor the geomembrane to the perimeter, thereby improving the impermeability of the impermeable layer 4. This novel reservoir basin bottom emptying structure can be used for emptying reservoirs below the sand-trapping embankment elevation. It is structurally safe and reliable, highly replicable, and has broad engineering application value.
[0026] The above embodiments should be understood as being used only to illustrate the utility model more clearly, and not to limit the scope of the utility model. After reading this utility model, any modifications of the embodiments by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.
Claims
1. A full-bank reservoir bottom emptying structure, comprising a reservoir bottom anti-seepage layer (4), a reservoir perimeter panel (5), and a reservoir bottom corridor (1) connecting the reservoir bottom anti-seepage layer (4) and the reservoir perimeter panel (5); characterized in that: Further comprising a bottom drainage hole (3) which is communicated with the passage (101) of the bottom gallery (1); the bottom gallery (1) is provided with a drainage pipe (7), the upper end of the drainage pipe (7) extends to the top of the bottom gallery (1), and the lower end of the drainage pipe (7) extends into the bottom drainage hole (3).
2. The full library pot bank venting structure of claim 1, wherein: The upper end of the drainage pipe (7) is provided with a protective cover (9), and the protective cover (9) is provided with a grid hole.
3. The full library pot bank drain structure of claim 2, wherein: The grid hole of the protective cover (9) has a hole diameter of not more than 80mm.
4. The full library pot bank drain structure of claim 2, wherein: The bottom of the protective cover (9) is anchoringly connected with the top of the bottom gallery (1).
5. The full library pot bank drain structure of claim 1, wherein: The bottom anti-seepage layer (4) adopts a geomembrane anti-seepage.
6. The full library pot bank drain structure of claim 5, wherein: The top of the bottom gallery (1) is provided with a first anchoring groove (2) which is arranged between the upper end of the drainage pipe (7) and the bottom anti-seepage layer (4), and the geomembrane in the bottom anti-seepage layer (4) is anchored into the first anchoring groove (2).
7. The full library pot bank drain structure of claim 5, wherein: The connection between the upper end of the drainage pipe (7) and the top of the bottom gallery (1) is provided with a second anchoring groove (6), and the geomembrane in the bottom anti-seepage layer (4) extends to the top of the bottom gallery (1) and is anchored into the second anchoring groove (6).
8. The full library pot bank drain structure of any one of claims 1-7, wherein: The pipe wall of the drainage pipe (7) located in the passage (101) of the bottom gallery (1) is provided with an outer concrete layer (10).
9. The full library pot bank drain structure of any one of claims 1-7, wherein: The lower end of the drainage pipe (7) is provided with an inspection valve (11) and a working valve (12), and the inspection valve (11) is arranged on the inner side of the working valve (12).
10. The full library pot bank drain structure of any one of claims 1-7, wherein: The bottom drainage hole (3) is provided with two bottom drainage holes (3) which are respectively communicated with the passage (101) of the bottom gallery (1); the drainage pipe (7) is provided with two drainage pipes (7) which are respectively arranged corresponding to the two bottom drainage holes (3).