Foundation anti-seepage drainage structure suitable for high tail water variable amplitude shoreside type power station workshop

Abstract

The invention relates to an anti-seepage drainage structure for a shoreside type power station plant foundation suitable for high tailwater amplitude variation, which is characterized in that a grouting drainage gallery is arranged in a concrete bottom plate foundation at the lower part of a tailwater platform, a drainage ditch and a curtain grouting hole are arranged in the grouting gallery, and a curtain grouting construction channel is reserved; and after construction of the plant is completed, construction and grouting of curtain grouting holes are conducted through the reserved curtain grouting construction channel. On the basis of a traditional shoreside type power station workshop structure, a grouting drainage gallery is arranged in a concrete bottom plate on the lower portion of a tail horizontal platform, drainage ditches and curtain grouting holes are formed in the grouting gallery, and curtain grouting construction channels are reserved; and curtain grouting is performed through the reserved curtain grouting construction channel, so that the problem of downstream tail water surrounding seepage of the factory building in the high tail water variable-amplitude area is effectively solved, the uplift pressure of a factory building base is effectively reduced, and safe, stable and reliable operation of the factory building is ensured.

Description

Technical Field

[0001] The invention relates to the field of power plant design for water conservancy and hydropower engineering, and more specifically to a foundation anti-seepage drainage structure for a shore-type power plant with high tailwater amplitude. Background Art

[0002] Due to the differences in natural conditions, hub layout, water head and unit type of hydropower stations, the types of hydropower station buildings are also diverse. At present, according to the characteristics of hub layout and structural stress, hydropower station buildings can be divided into riverbed-type buildings, dam-back-type buildings, shore-type buildings and underground buildings. Among them, shore-type buildings are generally arranged along the river bank. They are a kind of water diversion channel (such as water diversion tunnel, open channel, etc.) arranged in the river bank to divert water, and the power station building is arranged at the end of the water diversion system at a certain distance from the dam. The shore-type building can be applied to various water heads, and its structure is simple and easy to construct, so it is widely used. However, due to the constraints of many factors such as the layout of the water diversion system, the topography of the plant area, and the engineering geological conditions, the shore-type power station building is inevitably arranged in an area with a large tailwater fluctuation. When the tailwater fluctuation of the power plant is large, the downstream water level is high, and the uplift pressure is large (the upstream and downstream water level difference is large), the water flow may seep into the power plant foundation through the downstream of the power plant. Especially for the power plant foundation in soft rock or with cracks, the safety, stability and reliable operation of the power plant will be greatly affected. Summary of the invention

[0003] The technical problem to be solved by the present invention is that when the shore-type power plant building is restricted by many factors such as the layout of the water diversion system, the topography of the plant area, and the engineering geological conditions, it must be arranged in an area with a large tailwater amplitude. In order to prevent the tailwater from bypassing the downstream of the building, effectively reduce the uplift pressure of the building base, and ensure the safe, stable and reliable operation of the building, a foundation anti-seepage and drainage structure for the shore-type power plant building with high tailwater amplitude is provided. The structure has strong applicability and can be widely used in the anti-seepage and drainage of the foundation of power plant buildings, especially for the anti-seepage and drainage treatment of the foundation of soft rock or cracked buildings.

[0004] The technical solution adopted by the present invention is:

[0005] In order to compensate for the fact that the tailwater downstream of a shore-side power plant building in a high tailwater amplitude fluctuation area seeps into the building floor foundation and affects the safe, stable and reliable operation of the building, the present invention provides a foundation anti-seepage and drainage structure for a shore-side power plant building with high tailwater amplitude fluctuation, the structure mainly involves a tailwater platform, a floor foundation, a flow channel floor, a grouting drainage gallery, a drainage ditch, a curtain grouting hole, a plant area leakage collection well, a curtain grouting construction channel, etc.

[0006] The present invention is a shore-type power plant building foundation anti-seepage drainage structure suitable for high tailwater amplitude variation, characterized in that: a grouting drainage gallery is set in the concrete bottom plate foundation at the bottom of the tailwater platform, drainage ditches and curtain grouting holes are set in the grouting gallery, and a curtain grouting construction channel is reserved; after the construction of the power plant is completed, the curtain grouting holes are constructed and grouted through the reserved curtain grouting construction channel. On the basis of the traditional shore-type power plant building structure, the present invention sets a grouting drainage gallery in the concrete bottom plate at the bottom of the tailwater platform, drainage ditches and curtain grouting holes are set in the grouting gallery, and a curtain grouting construction channel is reserved; after the construction of the power plant is completed, curtain grouting is carried out through the reserved curtain grouting construction channel, thereby effectively solving the problem of tailwater bypass seepage downstream of the power plant in the high tailwater amplitude variation area, effectively reducing the base uplift pressure of the power plant, and ensuring the safe, stable and reliable operation of the power plant.

[0007] Preferably, the grouting drainage gallery adopts a city gate tunnel type, and the cross-sectional dimensions of width and height are 3m×3.5m.

[0008] Preferably, the distance between the grouting drainage gallery and the bottom plate foundation surface and the distance from the flow channel bottom plate are 2m to 3m.

[0009] Preferably, the distance between the grouting drainage gallery and the downstream side wall of the tailwater platform is 3m.

[0010] Preferably, the bottom plate of the grouting drainage gallery is arranged with one side high and the other side low.

[0011] Preferably, the bottom plate slope of the grouting drainage gallery is 3% to 5%.

[0012] Preferably, the drainage ditch is arranged on the lower side of the bottom plate of the grouting drainage gallery, with dimensions of 0.2m×0.2m in width×height, one end of the drainage ditch is connected to the leakage collection well in the factory area, and the longitudinal slope ratio of the drainage ditch is 3% to 5%.

[0013] Preferably, the curtain grouting holes are arranged in a single row or multiple rows according to the tailwater amplitude, with a hole diameter of 70mm-110mm, a hole spacing of 1.5-2.5m, and a drilling depth of not less than the downstream length of the powerhouse.

[0014] The beneficial effects achieved by the present invention are:

[0015] 1. Effectively solve the problem of tailwater seepage into the plant floor foundation downstream of shore-side power plants in high tailwater amplitude areas, and effectively reduce the base uplift pressure of the plant;

[0016] 2. The seepage water from the upper structure of the plant can be discharged into the grouting drainage corridor and can be promptly discharged to the leakage collection well in the plant area, which effectively improves the durability of the plant concrete;

[0017] 3. Effectively ensure the overall stability and reliable operation of the plant, and significantly reduce subsequent operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structural layout of a traditional shore-based ground plant;

[0019] Figure 2 It is a schematic diagram of the overall layout of a shore-type power plant foundation anti-seepage and drainage structure suitable for high tailwater amplitude variation according to the present invention;

[0020] Figure 3 This is the general drawing of the grouting drainage corridor;

[0021] Figure 4 This is the cross-section of the drainage corridor;

[0022] In the figure: 1. bank slope, 2. water diversion channel, 3. plant floor foundation, 4. plant flow channel bottom plate, 5. main plant, 6. tailwater platform, 7. tailwater platform side wall, 8. highest tailwater level, 9. lowest tailwater level, 10. tailwater amplitude, 11. grouting drainage gallery, 12. curtain grouting hole, 13. curtain grouting construction channel, 14. drainage ditch, 15. grouting drainage gallery bottom plate slope, 16. grouting drainage gallery and plant floor foundation distance, 17. grouting drainage gallery height, 18. grouting drainage gallery and flow channel bottom plate foundation distance, 19. grouting drainage gallery width, 20. grouting drainage gallery and tailwater platform side wall distance, 21. drainage ditch bottom plate slope, 22. plant leakage collection well. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] 1. Explanation of terms in the manual:

[0025] Tailwater fluctuation: refers to the fluctuation of water level at the tailwater outlet of a hydropower station;

[0026] Curtain grouting: It is a grouting project that injects slurry into the cracks and pores of rock or soil to form a continuous water-blocking curtain to reduce the seepage volume and lower the seepage pressure.

[0027] Plant flow channel: refers to the channel through which water flows in the power plant;

[0028] Uplift pressure: refers to the sum of the buoyancy and seepage pressure of a building (structure) and its foundation on a certain horizontal calculation section.

[0029] 2. The implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0030] See also Figure 1 It can be seen that the traditional bank-side powerhouse is restricted by many factors such as the layout of the water diversion system, the topography of the powerhouse area, and engineering geological conditions. When the tailwater fluctuation 10 of the powerhouse is large and the tailwater level 8 is high, the water flow may seep through the downstream of the powerhouse and enter under the powerhouse bottom slab foundation 3, which will have a significant impact on the safety, stability, and reliable operation of the powerhouse.

[0031] See also Figure 2 to Figure 4 It can be seen that the present invention is a shore-type power plant building foundation anti-seepage drainage structure suitable for high tailwater amplitude. On the basis of the traditional shore-type power plant building structure, a grouting drainage gallery 11 is set in the concrete bottom plate foundation at the bottom of the tailwater platform 6, and a drainage ditch 14 and a curtain grouting hole 12 are set in the grouting gallery, and a curtain grouting construction channel 13 is reserved. After the construction of the plant is completed, the curtain grouting hole 12 is constructed and grouted through the reserved curtain grouting construction channel 13, thereby effectively solving the problem of tailwater bypass infiltration downstream of the plant in the high tailwater amplitude area. The grouting drainage gallery 11 generally adopts a city gate hole type, and the cross-sectional dimensions of width 19 and height 17 can be 3m×3.5m, the distance 16 from the bottom plate foundation surface and the distance 18 from the flow channel bottom plate can be 2m~3m, and the distance 20 from the downstream side wall of the tailwater platform can be 3m. The bottom plate of the grouting drainage gallery is set to be high on one side and low on the other side, and the bottom plate slope 15 can be 3%~5%. The drainage ditch 14 is arranged on the lower side of the bottom plate of the grouting drainage gallery, and the size can be 0.2m×0.2m (width×height). One end of the drainage ditch 14 is connected to the leakage collection well 22 in the plant area, and the longitudinal slope ratio 21 of the drainage ditch can be 3% to 5%. The curtain grouting construction channel 13 must meet the requirements of the curtain grouting related equipment in and out, and backfilling and plugging are required after the construction is completed. The curtain grouting holes 12 can be set in a single row or multiple rows according to the tailwater amplitude, with a hole diameter of 70mm to 110mm, a hole spacing of 1.5 to 2.5m, and a drilling depth of not less than the downstream length of the plant.

[0032] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0033] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A seepage-proof drainage structure for the foundation of a shore-side power plant building suitable for high tailwater amplitude, characterized in that: A grouting drainage gallery (11) is provided in the concrete slab foundation at the bottom of the tailwater platform (6), a drainage ditch (14) and a curtain grouting hole (12) are provided in the grouting gallery (11), and a curtain grouting construction channel (13) is reserved; after the construction of the plant building is completed, the curtain grouting hole (12) is constructed and grouted through the reserved curtain grouting construction channel (13).

2. The anti-seepage drainage structure for the foundation of a shore-side power station building suitable for high tailwater amplitude according to claim 1 is characterized in that: The grouting drainage gallery (11) is of a city gate type, and the cross-sectional dimensions of width (19) and height (17) are 3m×3.5m.

3. The anti-seepage drainage structure for the shore-side power plant building foundation suitable for high tailwater amplitude according to claim 1 is characterized by: The distance (16) between the grouting drainage gallery (11) and the bottom plate foundation surface and the distance (18) from the flow channel bottom plate are 2m to 3m.

4. The anti-seepage drainage structure for the shore-side power plant building foundation suitable for high tailwater amplitude according to claim 1 is characterized in that: The distance (20) between the grouting drainage gallery (11) and the downstream side wall of the tailwater platform is 3m.

5. The anti-seepage and drainage structure for the shore-side power plant building foundation suitable for high tailwater amplitude according to claim 1 is characterized in that: The bottom plate of the grouting drainage gallery (11) is arranged with one side being high and the other side being low.

6. The anti-seepage drainage structure for the foundation of a shore-side power station building suitable for high tailwater amplitude variation according to claim 5 is characterized in that: The bottom plate slope (15) of the grouting drainage gallery (11) is 3% to 5%.

7. The anti-seepage drainage structure for the shore-side power plant building foundation suitable for high tailwater amplitude according to claim 5 is characterized by: The drainage ditch (14) is arranged on the lower side of the bottom plate of the grouting drainage gallery (11), and has a size of 0.2m×0.2m in width×height. One end of the drainage ditch (14) is connected to the leakage collection well (22) in the factory area, and the longitudinal slope ratio (21) of the drainage ditch (14) is 3% to 5%.

8. The anti-seepage and drainage structure for the foundation of a shore-side power station building suitable for high tailwater amplitude according to claim 1 is characterized in that: The curtain grouting holes (12) are arranged in a single row or multiple rows according to the tailwater amplitude, with a hole diameter of 70 mm to 110 mm, a hole spacing of 1.5 to 2.5 m, and a drilling depth not less than the downstream length of the powerhouse.

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