Vertical shaft type plant structure for pumped storage power station

Abstract

The utility model discloses a vertical shaft type plant structure for a pumped storage power station, which comprises a plant body embedded and fixed in a heavy excavation rock body lower than the ground. Leakage water-collecting wells are arranged at the bottom of the plant body; a circle of first drainage ditch is formed in the slope of the heavy excavation rock body higher than the ground elevation; a circle of second drainage ditch is formed in the side slope flush with the top of the plant body; an upper-layer drainage gallery, a middle-layer drainage gallery and a lower-layer drainage gallery are respectively excavated in the large excavation rock mass from top to bottom in the annular direction and are lower than the elevation of the second drainage ditch; vertical drainage holes are uniformly distributed between the upper-layer drainage gallery and the middle-layer drainage gallery as well as between the middle-layer drainage gallery and the lower-layer drainage gallery; the second drainage ditch is communicated with the upper-layer drainage gallery, and the lower-layer drainage gallery is communicated with the leakage water-collecting well. The vertical shaft type plant structure for the pumped storage power station is suitable for unique geological conditions in the northern Shaanxi area, can avoid the problem of stability of top arch soft rocks, and is high in construction feasibility.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering, and relates to a vertical shaft type plant structure used for a pumped storage power station. Background Art

[0002] The suction height of the turbine of a pumped-storage power station is much higher than that of a conventional hydropower station. Under good surrounding rock conditions, an underground plant design is usually adopted.

[0003] In view of the unique topographic and geological conditions in northern Shaanxi, there is a thick layer of loess covering the upper part, horizontal soft and hard interlayered rock mass below, and the surrounding rock type is mainly Class IV. If an underground powerhouse is adopted, the top arch of the powerhouse cavern is prone to instability, and the surrounding rock cavern conditions and stability are poor, which poses a great engineering risk. Utility Model Content

[0004] The purpose of the utility model is to provide a shaft-type plant structure for a pumped storage power station, which is suitable for the unique geological conditions in northern Shaanxi, can avoid the stability problem of top arch soft rock, and has high construction feasibility.

[0005] The technical scheme adopted by the utility model is a shaft-type plant structure for a pumped storage power station, comprising a plant body, the plant body is embedded in a large excavated rock mass below the ground; a seepage collection well is arranged at the bottom of the plant body; a circle of first drainage ditches is arranged on the slope of the large excavated rock mass at a level higher than the ground elevation; a circle of second drainage ditches is arranged on the slope flush with the top position of the plant body; an upper drainage gallery, a middle drainage gallery and a lower drainage gallery are respectively excavated circumferentially from top to bottom inside the large excavated rock mass at a level lower than the second drainage ditch; vertical drainage holes are arranged between the upper drainage gallery and the middle drainage gallery and between the middle drainage gallery and the lower drainage gallery; the second drainage ditch is connected with the upper drainage gallery, and the lower drainage gallery is connected with the seepage collection well.

[0006] The utility model is also characterized in that:

[0007] A lower reservoir accident maintenance gate well is set below the ground elevation on the downstream side of the power building body, and a tailwater tunnel is set between the lower reservoir accident maintenance gate well and the power building body. A section of the tailwater tunnel close to the power building body is provided with a steel lining to form a tailwater steel lining section, and a section away from the power building body is a tailwater lining section.

[0008] A water-blocking curtain grouting ring is set in the rock mass separating the tailwater steel lining section and the tailwater lining section.

[0009] The first grouting curtain is constructed and laid downwards through the upper drainage gallery on the downstream side of the powerhouse body; the second grouting curtain is constructed and laid downwards through the middle drainage gallery on the downstream side of the powerhouse body; the second grouting curtain is overlapped with the grouting ring of the water-blocking curtain.

[0010] The lower end of the first grouting curtain exceeds the bottom elevation of the middle drainage gallery.

[0011] Inclined drainage holes are arranged between the upper drainage gallery and the slope.

[0012] The beneficial effects of the utility model are:

[0013] 1. The vertical shaft open excavation method can avoid the stability problem of the top arch soft rock, has high construction feasibility and convenient ventilation.

[0014] 2. The plant and switch station are designed for joint excavation. The ground switch station is arranged in combination with the plant excavation platform. On the one hand, it saves excavation volume. On the other hand, this platform can be used as an emergency evacuation platform for workers in the shaft-type plant, ensuring the safety of personnel in the event of an accident.

[0015] 3. The combination of slope drainage design and factory area drainage design solves the drainage problems of factory slopes and factory areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of a cross-sectional structure of a shaft-type plant structure used in a pumped-storage power station.

[0017] In the figure, 1. plant building; 2. first drainage ditch; 3. second drainage ditch; 4. upper drainage gallery; 5. middle drainage gallery; 6. lower drainage gallery; 7. tailwater tunnel; 701. tailwater steel lining section; 702. tailwater lining section; 8. water-blocking curtain grouting ring; 9. inclined drainage hole; 10. vertical drainage hole; 11. seepage collection well; 12. first grouting curtain; 13. second grouting curtain; 14. gate well for accident maintenance of lower reservoir. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0019] The utility model is used for the shaft-type plant structure of a pumped storage power station, such as Figure 1As shown, the powerhouse body 1 includes a powerhouse body 1, which is embedded in a large excavated rock mass below the ground; a seepage collection well 11 is set at the bottom of the powerhouse body 1; a circle of first drainage ditches 2 is opened on the slope of the large excavated rock mass at a height higher than the ground; a circle of second drainage ditches 3 is opened on the slope flush with the top position of the powerhouse body 1; an upper drainage gallery 4, a middle drainage gallery 5 and a lower drainage gallery 6 are excavated from top to bottom in the large excavated rock mass at a height lower than the second drainage ditch 3; the upper drainage gallery 4 and the middle drainage gallery 6 are respectively connected. Vertical drainage holes 10 are arranged between the corridors 5 and between the middle drainage corridor 5 and the lower drainage corridor 6; inclined drainage holes 9 are arranged between the upper drainage corridor 4 and the slope; the vertical drainage holes 10 and the inclined drainage holes 9 between the upper drainage corridor 4, the middle drainage corridor 5, the lower drainage corridor 6 and the drainage corridors on each layer form a drainage curtain around the factory building to reduce the leakage of groundwater into the factory building; the second drainage ditch 3 is connected to the upper drainage corridor 4, and the lower drainage corridor 6 is connected to the leakage collection well 11. A lower reservoir accident maintenance gate well 14 is set below the ground elevation on the downstream side of the powerhouse body 1. A tailwater tunnel 7 is set between the lower reservoir accident maintenance gate well 14 and the powerhouse body 1. A section of the tailwater tunnel 7 close to the powerhouse body 1 is provided with a steel lining to form a tailwater steel lining section 701, and a section away from the powerhouse body 1 is a tailwater lining section 702. A water-blocking curtain grouting ring 8 is set in the rock mass separating the tailwater steel lining section 701 and the tailwater lining section 702. A first grouting curtain 12 is constructed and laid downwardly through the upper drainage gallery 4 on the downstream side of the powerhouse body 1, and the lower end of the first grouting curtain 12 exceeds the bottom elevation of the middle drainage gallery 5 downwardly; a second grouting curtain 13 is constructed and laid downwardly through the middle drainage gallery 5 on the downstream side of the powerhouse body 1; the second grouting curtain 13 overlaps the water-blocking curtain grouting ring 8. The first grouting curtain 12, the second grouting curtain 13 and the water-blocking curtain grouting ring 8 play the role of water interception and pressure reduction.

[0020] Working principle of this utility model:

[0021] The shaft-type plant is formed by a large excavation, and is embedded in the rock mass on all sides. The excavation below the plant is vertical, and the excavation above is a steep slope. To avoid flooding of the plant, the shaft-type plant structure also includes a slope drainage system and a plant area drainage system, which is more suitable for the unique topographic and geological conditions of northern Shaanxi.

[0022] On the one hand, a circle of large-section first drainage ditch 2 is set at the upper elevation of the slope of the large excavation rock mass, and the slope water above this elevation is directly discharged to the lower reservoir through the first drainage ditch 2 via the ground platform. In addition, a circle of large-section second drainage ditch 3 is added to the slope flush with the top of the plant body 1. The slope water between the two elevations can be introduced into the upper drainage gallery 4 in the large excavation rock mass through the upper drainage gallery 4 and the slope through the inclined drainage holes 9 arranged between the slope, and the second drainage ditch 3 is introduced into the leakage water collection well 11 through the vertical drainage holes 10 between the drainage galleries, through the middle drainage gallery 5 to the lower drainage gallery 6, and finally, the accumulated water is discharged to the outside of the factory in time by strengthening the pumping and drainage.

[0023] On the other hand, in order to reduce the impact of groundwater level and seepage from the lower reservoir on the plant, vertical drainage holes 10 are set between the three drainage corridors of the upper drainage corridor 4, the middle drainage corridor 5, and the lower drainage corridor 6 to form a drainage curtain around the periphery of the plant to reduce the leakage of groundwater into the plant. The leakage water in the plant area is drained to the lower drainage corridor 6 through the upper drainage corridor 4, the middle drainage corridor 5 and the vertical drainage holes 10 and then flows into the leakage collection well 11 in the plant. At the same time, a water-blocking curtain grouting ring 8 is set in the rock foundation bounded by the tailwater steel lining section 701 and the tailwater lining section 702, which overlaps and closes with the second grouting curtain 13 of the plant drainage corridor to achieve a certain water interception and pressure reduction effect.

[0024] Embodiment 1:

[0025] A shaft-type plant structure for a pumped-storage power station comprises a plant body 1, which is embedded in a large excavated rock mass below the ground; a seepage collection well 11 is arranged at the bottom of the plant body 1; a circle of first drainage ditches 2 is opened on the slope of the large excavated rock mass at a level higher than the ground; a circle of second drainage ditches 3 is opened on the slope flush with the top of the plant body 1; an upper drainage gallery 4, a middle drainage gallery 5 and a lower drainage gallery 6 are excavated from top to bottom in a circumferential direction inside the large excavated rock mass at a level lower than the second drainage ditch 3; vertical drainage holes 10 are arranged between the upper drainage gallery 4 and the middle drainage gallery 5 and between the middle drainage gallery 5 and the lower drainage gallery 6; the second drainage ditch 3 is connected to the upper drainage gallery 4, and the lower drainage gallery 6 is connected to the seepage collection well 11.

[0026] A lower reservoir accident maintenance gate shaft 14 is set below the ground elevation on the downstream side of the power building body 1, and a tailwater tunnel 7 is set in communication between the lower reservoir accident maintenance gate shaft 14 and the power building body 1. A section of the tailwater tunnel 7 close to the power building body 1 is provided with a steel lining to form a tailwater steel lining section 701, and a section away from the power building body 1 is a tailwater lining section 702.

[0027] A water-blocking curtain grouting ring 8 is arranged in the rock foundation separating the tailwater steel lining section 701 and the tailwater lining section 702 .

[0028] Embodiment 2:

[0029] A shaft-type plant structure for a pumped-storage power station comprises a plant body 1, which is embedded in a large excavated rock mass below the ground; a seepage collection well 11 is arranged at the bottom of the plant body 1; a circle of first drainage ditches 2 is opened on the slope of the large excavated rock mass at a level higher than the ground; a circle of second drainage ditches 3 is opened on the slope flush with the top of the plant body 1; an upper drainage gallery 4, a middle drainage gallery 5 and a lower drainage gallery 6 are excavated from top to bottom in a circumferential direction inside the large excavated rock mass at a level lower than the second drainage ditch 3; vertical drainage holes 10 are arranged between the upper drainage gallery 4 and the middle drainage gallery 5 and between the middle drainage gallery 5 and the lower drainage gallery 6; the second drainage ditch 3 is connected to the upper drainage gallery 4, and the lower drainage gallery 6 is connected to the seepage collection well 11.

[0030] A lower reservoir accident maintenance gate shaft 14 is set below the ground elevation on the downstream side of the power building body 1, and a tailwater tunnel 7 is set in communication between the lower reservoir accident maintenance gate shaft 14 and the power building body 1. A section of the tailwater tunnel 7 close to the power building body 1 is provided with a steel lining to form a tailwater steel lining section 701, and a section away from the power building body 1 is a tailwater lining section 702.

[0031] A water-blocking curtain grouting ring 8 is arranged in the rock foundation separating the tailwater steel lining section 701 and the tailwater lining section 702 .

[0032] A first grouting curtain 12 is constructed and laid downwards through the upper drainage gallery 4 on the downstream side of the powerhouse body 1 ; a second grouting curtain 13 is constructed and laid downwards through the middle drainage gallery 5 on the downstream side of the powerhouse body 1 ; the second grouting curtain 13 overlaps with the water-blocking curtain grouting ring 8 .

[0033] The lower end of the first grouting curtain 12 goes downwards beyond the bottom elevation of the middle drainage gallery 5 .

[0034] Embodiment 3:

[0035] A shaft-type plant structure for a pumped-storage power station comprises a plant body 1, which is embedded in a large excavated rock mass below the ground; a seepage collection well 11 is arranged at the bottom of the plant body 1; a circle of first drainage ditches 2 is opened on the slope of the large excavated rock mass at a level higher than the ground; a circle of second drainage ditches 3 is opened on the slope flush with the top of the plant body 1; an upper drainage gallery 4, a middle drainage gallery 5 and a lower drainage gallery 6 are excavated from top to bottom in a circumferential direction inside the large excavated rock mass at a level lower than the second drainage ditch 3; vertical drainage holes 10 are arranged between the upper drainage gallery 4 and the middle drainage gallery 5 and between the middle drainage gallery 5 and the lower drainage gallery 6; the second drainage ditch 3 is connected to the upper drainage gallery 4, and the lower drainage gallery 6 is connected to the seepage collection well 11.

[0036] A lower reservoir accident maintenance gate shaft 14 is set below the ground elevation on the downstream side of the power building body 1, and a tailwater tunnel 7 is set in communication between the lower reservoir accident maintenance gate shaft 14 and the power building body 1. A section of the tailwater tunnel 7 close to the power building body 1 is provided with a steel lining to form a tailwater steel lining section 701, and a section away from the power building body 1 is a tailwater lining section 702.

[0037] A water-blocking curtain grouting ring 8 is arranged in the rock foundation separating the tailwater steel lining section 701 and the tailwater lining section 702 .

[0038] A first grouting curtain 12 is constructed and laid downwards through the upper drainage gallery 4 on the downstream side of the powerhouse body 1 ; a second grouting curtain 13 is constructed and laid downwards through the middle drainage gallery 5 on the downstream side of the powerhouse body 1 ; the second grouting curtain 13 overlaps with the water-blocking curtain grouting ring 8 .

[0039] The lower end of the first grouting curtain 12 goes downwards beyond the bottom elevation of the middle drainage gallery 5 .

[0040] Inclined drainage holes 9 are arranged between the upper drainage gallery 4 and the slope.

Claims

1. A vertical shaft plant structure for a pumped storage power station, characterized in that: The invention comprises a plant body (1), wherein the plant body (1) is embedded in a large excavated rock mass below the ground; a seepage collection well (11) is arranged at the bottom of the plant body (1); a circle of first drainage ditches (2) is arranged on the slope of the large excavated rock mass at a level higher than the ground; a circle of second drainage ditches (3) is arranged on the slope at the same level as the top of the plant body (1); an upper drainage gallery (4), a middle drainage gallery (5) and a lower drainage gallery (6) are respectively excavated from top to bottom in the large excavated rock mass at a level lower than the level of the second drainage ditch (3); vertical drainage holes (10) are arranged between the upper drainage gallery (4) and the middle drainage gallery (5) and between the middle drainage gallery (5) and the lower drainage gallery (6); the second drainage ditch (3) is connected to the upper drainage gallery (4), and the lower drainage gallery (6) is connected to the seepage collection well (11).

2. The shaft-type plant structure for a pumped storage power station according to claim 1, characterized in that: A lower reservoir accident maintenance gate well (14) is arranged below the ground elevation on the downstream side of the powerhouse body (1); a tailwater tunnel (7) is arranged between the lower reservoir accident maintenance gate well (14) and the powerhouse body (1); a section of the tailwater tunnel (7) close to the powerhouse body (1) is provided with a steel lining to form a tailwater steel lining section (701), and a section away from the powerhouse body (1) is a tailwater lining section (702).

3. The shaft-type plant structure for a pumped storage power station according to claim 2, characterized in that: A water-blocking curtain grouting ring (8) is arranged in the rock mass separating the tailwater steel lining section (701) and the tailwater lining section (702).

4. The shaft-type plant structure for a pumped storage power station according to claim 3, characterized in that: A first grouting curtain (12) is constructed and laid downwards on the downstream side of the plant body (1) through an upper drainage gallery (4); a second grouting curtain (13) is constructed and laid downwards on the downstream side of the plant body (1) through a middle drainage gallery (5); and the second grouting curtain (13) is overlapped with a water-blocking curtain grouting ring (8).

5. The shaft-type plant structure for a pumped storage power station according to claim 4, characterized in that: The lower end of the first grouting curtain (12) is downward and exceeds the bottom elevation of the middle drainage gallery (5).

6. The shaft-type plant structure for a pumped storage power station according to claim 1, characterized in that: Inclined drainage holes (9) are arranged between the upper drainage gallery (4) and the side slope.

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