A gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station

Abstract

The invention discloses a gravity drainage system for a maintenance channel of a water diversion tunnel of a pumped-storage power station, comprising a drainage ditch for the maintenance channel, a drainage steel pipe, a water collection well and a drainage hole. The groundwater in the maintenance channel of the water diversion tunnel can be collected in the water collection well by gravity through the drainage ditches on both sides of the bottom plate of the maintenance channel, and the leakage water of the permanent plugging body of the maintenance channel of the water diversion tunnel can be collected in the water collection well by gravity through the drainage steel pipe pre-buried in the lower part of the bottom plate of the hollow gallery of the permanent plugging body; the water collection well is located at the end of the permanent plugging body of the maintenance channel, and is connected to the gravity drainage hole arranged along the slope; the groundwater collected in the water collection well can be discharged to the natural channel outside the hole through the gravity drainage hole. The invention is suitable for the maintenance channel of the water diversion tunnel of a pumped-storage power station with the conditions for arranging a gravity drainage hole, and is intended to use gravity drainage without the need to invest in mechanical pumping and drainage equipment, thereby reducing the cost of equipment operation and maintenance and manual maintenance, reducing the energy consumption of the equipment, and effectively coping with emergencies such as equipment failure and power outage, thereby improving the reliability of the drainage system of the maintenance channel.

Description

Technical Field

[0001] The present invention relates to the field of maintenance channels, and mainly to a gravity drainage system for the maintenance channel of the water intake horizontal tunnel of a pumped-storage power station. Background Art

[0002] For the maintenance channels of the water intake horizontal tunnels of pumped-storage power stations, a combination of permanent and temporary arrangements is mostly adopted to meet the needs of transportation during the construction period of the water diversion system and permanent maintenance during the operation period, and to save project investment. The suction height of the pump-turbine units in pumped-storage power stations is large and the installation elevation is low, and the layout of the project's water conveyance and power generation system often has a large underground burial depth; in addition, due to factors such as the topographic and geological conditions and traffic conditions around the project, most of the maintenance channels of the water intake horizontal tunnels are arranged with an adverse slope.

[0003] After the construction of the permanent plugging body of the water diversion system is completed, the maintenance channel of the water intake horizontal tunnel needs to undertake the traffic task of the permanent plugging body or the maintenance of the water diversion system. Therefore, it is necessary to ensure the timely and effective discharge of groundwater in the maintenance channel. The maintenance channels arranged with an adverse slope usually adopt mechanical pumping for drainage, but mechanical pumping consumes a large amount of electric energy, increases equipment costs, and has high operation and maintenance costs, especially for projects with rich groundwater. In addition, for emergencies such as mechanical failures and power outages, the drainage reliability of mechanical pumping equipment cannot be guaranteed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a gravity drainage system for the maintenance channel of the water intake horizontal tunnel of a pumped-storage power station. The present invention aims to utilize gravity drainage to reduce the investment and operation and maintenance costs of mechanical pumping equipment, and to drain water continuously and stably, and improve the reliability of the drainage system of the maintenance channel.

[0005] The object of the present invention is achieved by the following technical solutions. A gravity drainage system for the maintenance channel of the water intake horizontal tunnel of a pumped-storage power station, the gravity drainage system includes a maintenance channel drainage ditch, a drainage steel pipe, a sump well and a drainage tunnel. Among them, the maintenance channel drainage ditch is arranged in the maintenance channel with an adverse slope, so that the groundwater in the maintenance channel can flow by gravity and converge into the sump well through the maintenance channel drainage ditch; a permanent plugging body hollow corridor is arranged in the permanent plugging body close to the water intake horizontal tunnel, and there is an inclined drainage steel pipe in the permanent plugging body hollow corridor, so that the seepage water of the permanent plugging body can flow by gravity and converge into the sump well through the drainage steel pipe; the sump well is connected to the drainage tunnel, so that the water collected in the sump well can flow out by gravity through the drainage tunnel.

[0006] Furthermore, the maintenance channel drainage ditch is located on both sides of the concrete floor of the maintenance channel.

[0007] Furthermore, the drainage steel pipe is embedded under the concrete floor slab in the hollow corridor of the permanent plugging body. The hollow corridor of the permanent plugging body is arranged with an inverse slope and is connected to the maintenance passage. The water inlet of the drainage steel pipe is arranged at the end of the hollow corridor of the permanent plugging body, so that the seepage water of the permanent plugging body can flow and converge at the water inlet of the drainage steel pipe by gravity.

[0008] Furthermore, the sump is located at the end of the permanent plugging body.

[0009] Furthermore, the sump adopts a reinforced concrete structure.

[0010] Furthermore, the drainage steel pipes are arranged on the plane with a slope of at least 2% towards the side of the sump, and a total of 2 pipes are arranged.

[0011] Furthermore, the drainage steel pipe is made of galvanized material.

[0012] Furthermore, a steel mesh is fixedly connected to the water inlet of the drainage steel pipe to prevent siltation.

[0013] Furthermore, the drainage tunnel is arranged with a downward slope, and the cross-section is in the shape of a horseshoe arch.

[0014] Furthermore, drainage ditches are arranged on both sides of the concrete floor slab of the drainage tunnel in the drainage tunnel.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) This technical solution utilizes gravity drainage. The groundwater in the maintenance passage and the seepage water of the permanent plugging body flow and converge in the sump by gravity and are discharged from the gravity drainage tunnel, eliminating the need to invest in mechanical pumping equipment, reducing the costs of equipment operation and maintenance and manual inspection, and at the same time reducing the power consumption of the equipment, which is low-carbon and environmentally friendly.

[0017] (2) This technical solution can effectively cope with emergencies such as equipment failures and power outages, ensure continuous and stable drainage of the maintenance passage, and improve the reliability of the drainage system of the maintenance passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the plan layout drawing of the present invention.

[0019] Figure 2 is the schematic sectional structure view of the present invention along the extending direction of the maintenance passage.

[0020] Figure 3 is the schematic sectional structure view of the present invention along the extending direction of the drainage tunnel.

[0021] Figure 4 is the schematic layout drawing of the typical cross-section structure of the drainage tunnel of the present invention.

[0022] Figure 5 It is a schematic diagram of the local structural layout of the water inlet of the drainage steel pipe of the present invention.

[0023] Explanation of the accompanying reference numerals: 1-leveling tunnel; 2-permanent sealing body; 3-maintenance passage; 4-drainage steel pipe; 5-collecting well; 6-drainage hole; 21-hollow corridor of permanent sealing body; 31-drainage ditch of maintenance passage; 32-concrete bottom plate of maintenance passage; 41-steel mesh; 61-drainage ditch of drainage hole; 62-concrete bottom plate of drainage hole. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with the accompanying drawings and specific embodiments. However, it should be understood that the accompanying drawings are only for illustrative purposes and cannot be understood as limiting the present invention. In order to better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The positional relationship described in the accompanying drawings is only for illustrative purposes and cannot be understood as limiting the present invention.

[0025] like Figures 1-4 As shown, the present invention is applied to a maintenance channel of a diversion tunnel, and provides a gravity drainage system for the maintenance channel of a diversion tunnel of a pumped-storage power station, including a maintenance channel drainage ditch 31, a drainage steel pipe 4, a collection well 5 and a drainage tunnel 6. The maintenance channel 3 is arranged in a reverse slope on one side of the diversion tunnel 1. The reverse slope arrangement means that the height of the maintenance channel 3 gradually decreases along the direction of the diversion tunnel 1.

[0026] As an implementation method, the inspection channel drainage ditch 31 is arranged in the inspection channel 3 and is located on both sides of the inspection channel concrete bottom plate 32; the water collection well 5 is located at the end of the permanent plugging body 2, and adopts a reinforced concrete pit structure. The groundwater in the inspection channel 3 flows through the inspection channel drainage ditch 31 and is collected in the water collection well 5. The flow direction of the groundwater is as follows: Figure 1 and Figure 2 The direction of the arrow.

[0027] As an implementation method, a permanent sealing body hollow corridor 21 is provided in the permanent sealing body 2 near the horizontal diversion tunnel 1. The permanent sealing body hollow corridor 21 is arranged in reverse slope and connected to the maintenance channel 3. A drainage steel pipe 4 is pre-buried in the lower part of the concrete bottom plate in the permanent sealing body hollow corridor 21. The water inlet of the drainage steel pipe 4 is provided at the end of the channel of the permanent sealing body hollow corridor 21. The leakage water of the permanent sealing body 2 is collected at the water inlet of the drainage steel pipe 4 by gravity. The flow direction of the leakage water is detailed in Figure 5The direction of the arrow in. The drainage steel pipe 4 is made of galvanized material, and on the plane, the drainage steel pipe 4 is arranged with a slope of 2% towards the sump side. The water outlet of the drainage steel pipe 4 is arranged in the sump 5. A total of 2 drainage steel pipes 4 are arranged to meet the drainage requirements. The flow direction of the seepage water in the drainage steel pipe 4 is as Figure 2 the direction of the arrow in.

[0028] As an implementation manner, as Figure 5 shown, a steel bar mesh 41 is arranged at the water inlet of the drainage steel pipe 4. The steel bar mesh 41 is spot-welded to the drainage steel pipe 4. The steel bar mesh 41 is used to prevent siltation.

[0029] As an implementation manner, as Figure 4 shown, the drainage tunnel 6 is arranged along the slope, and the cross-section is in the shape of a horseshoe arch for convenient engineering construction. The sump 5 is communicated with the drainage tunnel 6. Drainage tunnel drainage ditches 61 are provided on both sides of the concrete floor 62 of the drainage tunnel 6 in the drainage tunnel 6. The water collected in the sump 5 can flow out to the natural channel outside the tunnel by gravity through the drainage tunnel 6. The flow direction is as Figure 3 the direction of the arrow in.

[0030] The present invention aims to utilize gravity flow drainage, without the need to invest in mechanical pumping equipment, reducing the costs of equipment operation and maintenance and manual inspection, and can effectively cope with emergencies such as equipment failures and power outages, improving the reliability of the drainage system of the inspection passage, and is very suitable for the inspection passage of the water intake tunnel of a pumped-storage power station with the condition of arranging a gravity flow drainage tunnel.

[0031] It should be noted that the above description is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Those skilled in the art should understand that any simple modification and equivalent change made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station, Characterized in that: The gravity drainage system includes an inspection passage drain (31), a drainage steel pipe (4), a sump (5) and a drainage tunnel (6). Among them, the inspection passage drain (31) is arranged in the inspection passage (3) with an adverse slope, so that the groundwater in the inspection passage (3) can flow by gravity and converge into the sump (5) through the inspection passage drain (31); a permanent plug hollow corridor (21) is arranged in the permanent plug (2) near the water intake horizontal tunnel (1), and an inclined drainage steel pipe (4) is arranged in the permanent plug hollow corridor (21), so that the seepage water of the permanent plug (2) can flow by gravity and converge into the sump (5) through the drainage steel pipe (4); the sump (5) is connected to the drainage tunnel (6), so that the water converged in the sump (5) can flow by gravity and be discharged through the drainage tunnel (6); The inspection passage drain (31) is located on both sides of the inspection passage concrete floor (32); The drainage steel pipe (4) is embedded under the concrete floor of the permanent plug hollow corridor (21). The permanent plug hollow corridor (21) is arranged with an adverse slope and is connected to the inspection passage (3). The water inlet of the drainage steel pipe (4) is arranged at the end of the permanent plug hollow corridor (21), so that the seepage water of the permanent plug (2) can flow by gravity and converge at the water inlet of the drainage steel pipe (4).

2. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 1, Characterized in that: The sump (5) is located at the end of the permanent plug (2).

3. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 2, Characterized in that: The sump (5) adopts a reinforced concrete structure.

4. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 1, Characterized in that: The drainage steel pipe (4) is arranged on the side inclined towards the sump at a slope of at least 2% in the plane, and a total of 2 are arranged.

5. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 1, Characterized in that: The drainage steel pipe (4) is made of galvanized material.

6. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 1, Characterized in that: A steel mesh (41) is fixedly connected to the water inlet of the drainage steel pipe (4) for preventing siltation.

7. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 1, Characterized in that: The drainage tunnel (6) is arranged with a favorable slope, and the cross-section is in the shape of a horseshoe arch.

8. The gravity drainage system for the inspection passage of the water intake horizontal tunnel of a pumped-storage power station according to claim 7, Characterized in that: Drainage tunnel drains (61) are arranged on both sides of the drainage tunnel concrete floor (62) in the drainage tunnel (6).

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