Drainage gallery system at bottom of full-defense reservoir basin of pumped storage power station

Abstract

The utility model discloses a drainage gallery system for a full-prevention reservoir basin and a reservoir bottom of a pumped storage power station, which comprises an upper reservoir basin anti-seepage panel and a reservoir bottom drainage gallery, drainage ditches are arranged on two sides of the bottom of the reservoir bottom drainage gallery, and a cushion material is backfilled between the upper reservoir basin anti-seepage panel and the reservoir bottom drainage gallery. Two water collecting grooves are formed in the top of the reservoir bottom drainage gallery in the trend of the reservoir bottom drainage gallery, and hard PVC drainage pipes are pre-buried in the side walls of the two sides of the gallery; the top of the drainage pipe is located in the water collecting tank, the top end of the drainage pipe is plugged through a perforated plastic circular plate and wrapped with non-woven fabric, the periphery of a pipe opening is filled with gravel with the particle size of 2-3 cm, the bottom of the drainage pipe is sequentially connected with the drainage ditch, and the water collecting tank is backfilled with non-fine concrete. The device can effectively collect and discharge seepage water at the bottom of the full-prevention reservoir basin of the pumped storage power station, ensures the stability and safety of the reservoir basin structure, and has the advantages of simple structure, convenience in construction and the like.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower engineering technology, and in particular to a drainage corridor system for the bottom of a fully protected reservoir basin in a pumped storage power station. Background Art

[0002] During the construction and operation of pumped storage power stations, leakage and drainage at the bottom of the reservoir have always been important factors affecting the safety and stable operation of the power station.

[0003] To address this issue, asphalt concrete or reinforced concrete panels are typically used for full-basin seepage prevention. However, even with these measures, some minor leakage paths may still exist, leading to water accumulation at the bottom of the reservoir. Because the full-basin seepage prevention structure of a pumped storage power station is a thin-layer structure, if the seepage water at the bottom cannot be drained quickly enough, the reverse water pressure at the bottom cannot be effectively eliminated. This can cause the entire seepage prevention structure to be subjected to back pressure, potentially leading to instability and damage to the bottom structure, affecting its seepage prevention effect, and even causing serious safety accidents. Therefore, an effective bottom drainage system is needed to promptly drain seepage water from the bottom of the reservoir, reduce water pressure, and ensure the safe and stable operation of the power station. Utility Model Content

[0004] The purpose of this utility model is to provide a drainage corridor system for the bottom of the fully protected reservoir basin of a pumped storage power station, which can effectively drain water seepage from the bottom of the fully protected reservoir basin, improve the stability and bearing capacity of the reservoir bottom, prevent uneven settlement and deformation from damaging the upper reservoir basin anti-seepage panel structure, and ensure the stability and safety of the reservoir basin structure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A drainage corridor system for the bottom of a pumped storage power station with a fully waterproof reservoir basin, comprising an upper reservoir basin waterproof panel and a bottom drainage corridor. Drainage ditches are provided on both sides of the bottom of the bottom drainage corridor. A pad material layer is backfilled between the upper reservoir basin waterproof panel and the bottom drainage corridor. Two water collection troughs are provided on the top of the bottom drainage corridor along the direction of the bottom drainage corridor. Rigid PVC drainage pipes are pre-embedded inside the side walls on both sides of the corridor. The top of the drainage pipe is located in the water collection trough, and the top end is sealed with a perforated plastic round plate and wrapped with non-woven fabric. The pipe opening is filled with 2-3cm of gravel. The bottom of the drainage pipe is connected to the drainage ditch. The water collection trough is backfilled with sand-free concrete.

[0006] The reservoir basin seepage-proof panel is made of asphalt concrete or reinforced concrete. The asphalt concrete seepage-proof panel includes a sealing layer, a seepage-proof layer, and a leveling and bonding layer, with a thickness of 11.2–20.2 cm. The reinforced concrete panel has a concrete strength grade of not less than C25 and a thickness of not less than 0.3 m. The permeability coefficient K of the upper reservoir basin seepage-proof panel is ≤ i × 10⁻⁶. - 8cm / s, i is 1 to 9.

[0007] The drainage corridor at the bottom of the reservoir is a reinforced concrete structure with a concrete strength grade of not less than C25. It adopts a circular arch and straight wall reinforcement type, and has a water collection trough at the top. The trough is 1m wide at the top, 0.6m wide at the bottom, and 0.2m deep. A pair of troughs are symmetrically arranged along the center line of the corridor. The trough is backfilled with no-fines concrete with a strength grade of not less than C15 and a permeability coefficient K≥i×10. -2 cm / s, i is 1 to 9, the slope ratio of the outer walls of the corridor is not steeper than 1:0.2, the inner walls of the corridor are arched straight walls, and rigid PVC drainage pipes are pre-embedded inside the side walls on both sides.

[0008] The rigid PVC drainage pipes are located inside the side walls on both sides of the corridor, distributed at certain intervals, with their tops located in the water collection troughs and a certain length exposed.

[0009] The beneficial effects of this utility model are as follows: By setting up water collection troughs, rigid PVC drainage pipes, and drainage ditches, this utility model can effectively collect and drain seepage water from the bottom of the pumped storage power station's reservoir basin. By adjusting the structural design slope ratio and backfilling measures, it improves the stability, bearing capacity, and deformation coordination of the reservoir bottom, preventing damage to the upper reservoir basin's seepage prevention structure caused by uneven settlement deformation, thus ensuring the stability and safety of the reservoir basin structure. This utility model has a simple structure and is easy to construct, providing ideas and references for the design of drainage corridor structures at the bottom of reservoirs in similar projects. Attached Figure Description

[0010] Figure 1 This is a typical cross-sectional view of the drainage corridor system at the bottom of the fully protected reservoir of the pumped storage power station of this utility model.

[0011] Figure 2 This is an enlarged view of the water collection trough of the drainage corridor system at the bottom of the fully protected reservoir of the pumped storage power station of this utility model;

[0012] Figure 3 This is a detailed drawing of the perforated plastic sheet for the drainage corridor system at the bottom of the fully protected reservoir of the pumped storage power station, which is based on this utility model.

[0013] Among them: 1--- Upper reservoir basin seepage-proof panel; 2--- Reservoir bottom drainage corridor; 3--- Rigid PVC drainage pipe; 4--- Drainage ditch; 5--- Water collection trough; 6--- Non-woven fabric; 7--- Perforated plastic round plate; 8--- Subbase material. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0015] In the description of this utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "both sides", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0017] like Figure 1-3 As shown, the drainage corridor system of the pumped storage power station with full protection of the reservoir bottom includes an upper reservoir anti-seepage panel 1 and a reservoir bottom drainage corridor 2. Drainage ditches 4 are provided on both sides of the bottom of the reservoir bottom drainage corridor. A bedding material 8 is backfilled between the upper reservoir anti-seepage panel 1 and the reservoir bottom drainage corridor 2. The feature is that two water collection troughs 5 are provided on the top of the reservoir bottom drainage corridor 2 along the direction of the reservoir bottom drainage corridor 2. Rigid PVC drainage pipes 3 are pre-embedded in the side walls on both sides of the corridor. The top of the drainage pipe 3 is located in the water collection trough 5. The top end is sealed with a perforated plastic round plate 7 and wrapped with non-woven fabric 6. The pipe opening is filled with 2-3cm of gravel. The bottom of the drainage pipe 3 is connected to the drainage ditch 4. The water collection trough 5 is backfilled with sand-free concrete.

[0018] The reservoir basin seepage-proof panel 1 is made of asphalt concrete or reinforced concrete. The asphalt concrete seepage-proof panel includes a sealing layer, a seepage-proof layer, and a leveling and bonding layer, with a thickness of 11.2–20.2 cm. The reinforced concrete panel has a concrete strength grade of not less than C25 and a thickness of not less than 0.3 m. The permeability coefficient K of the upper reservoir basin seepage-proof panel is ≤ i × 10⁻⁶. -8 cm / s, i is 1 to 9.

[0019] The drainage corridor 2 at the bottom of the reservoir is a reinforced concrete structure with a concrete strength grade of not less than C25. It adopts a circular arch and straight wall reinforcement type. The upper part is equipped with a water collection trough 5, which is 1m wide at the top, 0.6m wide at the bottom, and 0.2m deep. A pair of troughs are symmetrically arranged along the center line of the corridor. The backfill in the trough is no-fines concrete with a strength grade of not less than C15 and a permeability coefficient K≥i×10. -2cm / s, i is 1 to 9, the slope ratio of the outer walls of the corridor is not steeper than 1:0.2, the inner walls of the corridor are arched straight walls, and rigid PVC drainage pipes are pre-embedded inside the side walls on both sides.

[0020] The rigid PVC drainage pipe 3 is located inside the side walls on both sides of the corridor, distributed at certain intervals, with its top located in the water collection trough and a certain length exposed.

[0021] The following example, using a large-scale pumped storage power station project that adopts the technical solution of this utility model, is further illustrated with reference to the accompanying drawings:

[0022] A large pumped storage power station's upper reservoir adopts a full-basin seepage prevention scheme. The main structures include: an asphalt concrete-faced rockfill dam, a full-basin seepage prevention structure, and a reservoir bottom drainage system. The full-basin seepage prevention uses a simple asphalt concrete face panel. The structural sequence of the face panel from the inside out is: a 10cm thick ordinary petroleum asphalt concrete leveling and bonding layer, a 10cm thick modified asphalt concrete seepage prevention layer, and a 2mm thick modified asphalt mastic sealing layer.

[0023] To ensure the smooth drainage of seepage water behind the asphalt concrete anti-seepage panel, prevent back pressure from damaging the panel, guarantee the safe operation of the asphalt concrete panel and the upper reservoir, and facilitate monitoring of seepage and maintenance, a complete drainage system was installed. The drainage system consists of two parts: a crushed stone drainage layer and drainage galleries. The drainage galleries at the bottom of the reservoir utilize the drainage gallery system of this invention.

[0024] like Figure 1-3As shown, the drainage corridor structure of a pumped storage power station includes: an upper reservoir anti-seepage panel 1 and a reservoir bottom drainage corridor 2. The upper reservoir anti-seepage panel 1 is made of asphalt concrete, and the structural sequence of the panel from the inside to the outside is: a 10cm thick ordinary petroleum asphalt concrete leveling and bonding layer, a 10cm thick modified asphalt concrete anti-seepage layer, and a 2mm thick modified asphalt mastic sealing layer. The reservoir bottom drainage corridor 2 is a reinforced concrete structure with a slope ratio of 1:0.2 on both sides of the outer wall. It is made of C25 strength concrete and adopts a circular arch straight wall reinforcement type. A water collection trough 5 is provided at the top, and the bottom width of the water collection trough is 60cm. The top is 100cm wide and 20cm deep. The water collection trough 5 is backfilled with C15 no-fines concrete. Drainage ditches 4 are provided on both sides of the bottom, with dimensions of 30×20cm wide×height. Rigid PVC drainage pipes 3 with a diameter of 15mm are pre-embedded in the side walls of the drainage corridor 2 at both sides. The rigid PVC drainage pipes 3 are laid at 3m intervals. The top is located in the water collection trough 5, with the exposed length of the end 3cm, which is sealed with perforated plastic round plates 7 and wrapped with non-woven fabric 6. The pipe openings are filled with 2-3cm of gravel to prevent the no-fines concrete backfill from blocking the pipe openings. The perforated plastic round plates 7 are 20cm in diameter and 5mm thick, with 21 holes of 1.5cm in diameter evenly drilled on the plate. The bottom is connected to the drainage ditch 4 at a bend section 30cm above the bottom plate of the corridor for smooth connection. This utility model improves the stability, bearing capacity and deformation coordination performance of the reservoir bottom, prevents uneven settlement deformation from damaging the upper reservoir basin seepage prevention structure, and ensures the stability and safety of the reservoir basin structure.

[0025] The embodiments described above are only used to illustrate the technical ideas and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. The patent scope of this utility model should not be limited by these embodiments. That is, any equivalent changes or modifications made to the spirit disclosed in this utility model still fall within the patent scope of this utility model.

Claims

1. A drainage gallery system for the bottom of a pumped storage power station's reservoir basin, comprising an upper reservoir basin anti-seepage panel (1) and a bottom drainage gallery (2), with drainage ditches (4) on both sides of the bottom of the bottom drainage gallery, and a backfill material (8) between the upper reservoir basin anti-seepage panel (1) and the bottom drainage gallery (2), characterized in that, Two water collection troughs (5) are provided at the top of the drainage corridor (2) along the direction of the drainage corridor (2). Rigid PVC drainage pipes (3) are pre-embedded inside the side walls on both sides of the corridor. The top of the drainage pipe (3) is located in the water collection trough (5). The top end is sealed with a perforated plastic round plate (7) and wrapped with non-woven fabric (6). The pipe opening is filled with 2-3cm of gravel. The bottom of the drainage pipe (3) is connected to the drainage ditch (4). The water collection trough (5) is backfilled with sandless concrete.

2. The drainage gallery system at the bottom of the fully protected reservoir basin of the pumped storage power station according to claim 1, characterized in that, The reservoir basin seepage prevention panel (1) is made of asphalt concrete or reinforced concrete. The asphalt concrete seepage prevention panel includes a sealing layer, a seepage prevention layer, and a leveling and bonding layer, with a thickness of 11.2 to 20.2 cm. The reinforced concrete seepage prevention panel has a concrete strength grade of not less than C25 and a thickness of not less than 0.3 m. The permeability coefficient K of the upper reservoir basin seepage prevention panel is ≤ i × 10. -8 cm / s, i is 1 to 9.

3. The drainage gallery system at the bottom of the fully protected reservoir basin of the pumped storage power station according to claim 1, characterized in that, The drainage corridor (2) at the bottom of the reservoir is a reinforced concrete structure with a concrete strength grade of not less than C25. It adopts a circular arch and straight wall reinforcement type. A water collection trough (5) is provided at the top, with a top width of 1m, a bottom width of 0.6m, and a depth of 0.2m. A pair of troughs are symmetrically arranged along the center line of the corridor. The trough is backfilled with no-fines concrete with a strength grade of not less than C15 and a permeability coefficient K≥i×10. -2 cm / s, i is 1 to 9, the slope ratio of the outer walls of the corridor is not steeper than 1:0.2, the inner walls of the corridor are arched straight walls, and rigid PVC drainage pipes are pre-embedded inside the side walls on both sides (3).

4. The drainage gallery system at the bottom of the fully protected reservoir basin of the pumped storage power station according to claim 1, characterized in that, The rigid PVC drainage pipe (3) is located inside the side walls on both sides of the corridor, distributed at certain intervals. The top is located in the water collection trough, with a certain length exposed. The end is sealed with a perforated plastic round plate (7), wrapped with non-woven fabric (6), and filled with 2-3cm of gravel around the pipe opening. The bottom end is connected to the drainage ditch (4).

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