Arrangement structure for arranging emergency drainage hole in underground powerhouse by utilizing exploration adit

Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering, and discloses an arrangement structure for arranging an emergency drainage hole in an underground powerhouse by utilizing an exploration adit, which comprises a water diversion system construction adit, the emergency drainage hole and the exploration adit near the underground powerhouse. The starting elevation of the exploration adit is lower than the terminal elevation and has the self-flowing drainage characteristic, the starting elevation of the emergency drainage tunnel is higher than the terminal elevation, the starting point of the emergency drainage tunnel intersects with the lowest point of the diversion system construction adit, and the terminal point of the emergency drainage tunnel is communicated with the exploration adit. The method can solve the problem that the diversion system construction adit is difficult to automatically flow and drain water, fully utilizes the characteristic of automatic flow drainage of the exploration adit, reduces the tunnel excavation engineering amount and the pumping and drainage cost, saves the engineering investment, and better guarantees the flood control safety of the underground powerhouse construction period.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to an arrangement structure of an emergency drainage hole in an underground powerhouse by utilizing an exploration flat hole. Background Art

[0002] In recent years, extreme weather has occurred frequently, and excessive floods have greatly increased the risk of flooding in pumped storage power plants. The drainage design of the construction branch tunnels in the upper and middle sections of the water diversion system should fully consider the conditions for forming gravity drainage, and drain the rock seepage above the upper and middle sections of the water diversion system, construction wastewater, and rainwater that flows into the water diversion system through the inlet / outlet of the upper reservoir under abnormal circumstances by gravity, so as to better ensure the safety of underground power plants during the construction period of floods, and meet the needs of gravity drainage during the operation period. However, most pumped storage power station projects are currently restricted by terrain conditions and surrounding sensitive factors, and it is difficult to arrange the construction branch tunnels in the upper and middle sections of the water diversion system into tunnels with gravity drainage conditions.

[0003] In order to find out the engineering geological conditions of the underground powerhouse and determine the location and axial direction of the underground powerhouse, it is necessary to lay out an exploration tunnel in accordance with the requirements of geological survey specifications, and the laid out exploration tunnel must have a gravity drainage function. However, due to the temporary nature of the laid out exploration tunnel, the utilization rate of the exploration tunnel is often low during the construction detailing stage.

[0004] Therefore, how to drain the rock seepage above the upper and middle sections of the water diversion system, construction wastewater, and rainwater that flows into the water diversion system through the inlet / outlet of the upper reservoir under abnormal circumstances by gravity, and how to utilize the gravity drainage characteristics of the exploration flat tunnel to achieve the "one tunnel for multiple uses" of the exploration flat tunnel, reduce the tunnel excavation volume and pumping and drainage costs, save investment, improve the construction environment of underground projects, and reduce project safety risks have become urgent issues to be solved in pumped storage power station projects. Summary of the invention

[0005] The present invention aims to address the problems of the prior art and provides a solution to the problem that branch tunnels in the water diversion system construction are difficult to drain by gravity, fully utilizes the characteristics of gravity drainage in the exploration flat tunnel, reduces the tunnel excavation workload and pumping and drainage costs, saves project investment, and better ensures the safety of underground powerhouses during the flood season during the construction period. The underground powerhouse uses the exploration flat tunnel to set up an emergency drainage tunnel layout structure.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] An arrangement structure for setting up an emergency drainage hole in an underground powerhouse by using an exploration flat tunnel, comprising a water diversion system construction branch tunnel, an emergency drainage hole and an exploration flat tunnel near the underground powerhouse;

[0008] The starting elevation of the exploration flat tunnel is lower than the end elevation and can drain by gravity. The starting elevation of the emergency drainage tunnel is higher than the end elevation. The starting point of the emergency drainage tunnel intersects with the lowest point of the water diversion system construction branch tunnel, and the end point of the emergency drainage tunnel is connected to the exploration flat tunnel.

[0009] Preferably, the water diversion system construction branch tunnel includes a water diversion upper horizontal section construction branch tunnel and a water diversion middle horizontal section construction branch tunnel.

[0010] Preferably, the emergency drainage hole comprises a first emergency drainage hole, a first emergency drainage hole, a second emergency drainage hole, and a second emergency drainage hole;

[0011] The starting point elevation of the first emergency drainage tunnel is higher than the ending point elevation, and the starting point of the first emergency drainage tunnel intersects with the lowest point of the construction branch tunnel of the upper horizontal section of the water diversion;

[0012] The first emergency drainage hole is located at the end of the first emergency drainage hole;

[0013] The starting point elevation of the second emergency drainage tunnel is higher than the ending point elevation, and the starting point of the second emergency drainage tunnel intersects with the lowest point of the construction branch tunnel of the horizontal section of the water diversion;

[0014] The second emergency drainage hole is located at the end of the second emergency drainage hole.

[0015] Preferably, the exploration adit includes a first exploration adit branch cave, a second exploration adit branch cave and an exploration adit main cave;

[0016] The first exploration flat tunnel branch hole and the second exploration flat tunnel branch hole are both connected to the exploration flat tunnel main hole, and the elevations of the first exploration flat tunnel branch hole and the second exploration flat tunnel branch hole are both higher than the elevation of the exploration flat tunnel main hole.

[0017] Preferably, the first exploration adit branch hole is located below the first emergency drainage hole and is connected through the first emergency drainage hole.

[0018] Preferably, the second exploration adit branch hole is located below the second emergency drainage hole and is connected through the second emergency drainage hole.

[0019] Preferably, the longitudinal slope range of the branch tunnel for construction of the water diversion system is [0.3%, 9%].

[0020] Preferably, the emergency drainage hole is in the shape of a city gate hole, and the cross-sectional size is within a preset range. The support type and support parameters of the emergency drainage hole are determined according to geological conditions.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) The present invention solves the problem that the branch tunnel of the water diversion system is difficult to drain by self-flow by setting up an emergency drainage tunnel, the starting elevation of which is higher than the end elevation, and the starting point of the emergency drainage tunnel intersects with the lowest point of the branch tunnel of the water diversion system. The starting elevation of the exploration flat tunnel is lower than the end elevation, and the exploration flat tunnel is connected with the end of the emergency drainage tunnel. The invention makes full use of the characteristics of the exploration flat tunnel for self-flow drainage, reduces the amount of tunnel excavation and drainage costs, saves project investment, and better ensures the safety of underground powerhouses during the flood season;

[0023] (2) The present invention provides emergency drainage holes to connect the construction branch tunnel of the water diversion system, the emergency drainage tunnel and the exploration tunnel branch tunnel, thereby realizing the "one tunnel for multiple uses" of the exploration tunnel, improving the utilization rate of the exploration tunnel, reducing the tunnel excavation workload and pumping costs, saving investment, improving the construction environment of underground projects, and reducing project safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a drainage plan layout diagram of the connection between the first exploration flat tunnel branch tunnel and the water diversion upper flat section construction branch tunnel in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 It is a drainage plan layout diagram of the connection between the second exploration flat tunnel branch tunnel and the water diversion flat section construction branch tunnel in an embodiment of the present invention;

[0027] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0028] Description of reference numerals:

[0029] 11. Construction branch tunnel for the upper horizontal section of water diversion; 12. Construction branch tunnel for the middle horizontal section of water diversion; 21. First emergency drainage tunnel; 22. First emergency drainage hole; 23. Second emergency drainage tunnel; 24. Second emergency drainage hole; 31. Branch tunnel for the first exploration horizontal tunnel; 32. Branch tunnel for the second exploration horizontal tunnel; 33. Main tunnel for the exploration horizontal tunnel; 41. First water diversion tunnel; 42. Second water diversion tunnel; 51. Inlet / outlet of the first upper reservoir; 52. Inlet / outlet of the second upper reservoir; 6. Vertical shaft for pressure pipe; 71. Upper horizontal section of high-pressure pipeline; 72. Middle horizontal section of high-pressure pipeline; 8. Underground powerhouse cavern group. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0031] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0033] Example 1

[0034] The embodiment of the present invention provides an arrangement structure for setting up an emergency drainage hole in an underground powerhouse by using an exploration flat tunnel, comprising a water diversion system construction branch tunnel, an emergency drainage hole and an exploration flat tunnel near the underground powerhouse; the starting elevation of the exploration flat tunnel is lower than the end elevation, the starting elevation of the emergency drainage hole is higher than the end elevation, the starting point of the emergency drainage hole intersects with the lowest point of the water diversion system construction branch tunnel, and the end point of the emergency drainage hole is connected to the exploration flat tunnel;

[0035] Furthermore, the longitudinal slope range of the branch tunnel for construction of the water diversion system is [0.3%, 9%], the emergency drainage tunnel is in the shape of a city gate tunnel, and the cross-sectional dimensions are within a preset range. Specifically, the cross-sectional dimensions may be 3m in width and 3.5m in height. The support type of the emergency drainage tunnel may be determined according to the geological conditions, and the support parameters may be determined according to the geological conditions revealed by actual excavation and may be adjusted appropriately.

[0036] By setting up an emergency drainage hole, the starting elevation of the emergency drainage hole is higher than the end elevation, and the starting point of the emergency drainage hole is intersected with the lowest point of the water diversion system construction branch hole, the starting elevation of the exploration flat hole is lower than the end elevation, and the exploration flat hole is connected with the end point of the emergency drainage hole, the problem that the water diversion system construction branch hole is difficult to drain by gravity is solved, and the characteristics of the exploration flat hole for gravity drainage are fully utilized, the tunnel excavation project volume and pumping costs are reduced, the project investment is saved, and the flood safety of the underground plant construction period is better guaranteed.

[0037] Example 2

[0038] Different from Example 1, in this embodiment, according to Figure 1-2 As shown, the construction branch tunnel of the water diversion system includes a water diversion upper horizontal section construction branch tunnel 11, and a first emergency drainage tunnel 21 is arranged on one side of the water diversion upper horizontal section construction branch tunnel 11. The starting elevation of the first emergency drainage tunnel 21 is higher than the end elevation, and the starting point of the first emergency drainage tunnel 21 intersects with the lowest point of the water diversion upper horizontal section construction branch tunnel 11;

[0039] The exploration flat tunnel includes a first exploration flat tunnel branch tunnel 31, a second exploration flat tunnel branch tunnel 32 and an exploration flat tunnel main tunnel 33; the first exploration flat tunnel branch tunnel 31 and the second exploration flat tunnel branch tunnel 32 are both connected to the exploration flat tunnel main tunnel 33, and the elevations of the first exploration flat tunnel branch tunnel 31 and the second exploration flat tunnel branch tunnel 32 are both higher than the elevation of the exploration flat tunnel main tunnel 33;

[0040] The end point of the first emergency drainage hole 21 is located above the first exploration flat tunnel branch hole 31, and a first emergency drainage hole 22 is provided. In this embodiment, a drilling device can be used to perform drilling construction of the first emergency drainage hole 22. The diameter of the first emergency drainage hole 22 can be 200 mm-250 mm. The first emergency drainage hole 22 connects the first emergency drainage hole 21 and the first exploration flat tunnel branch hole 31;

[0041] The first water diversion tunnel 41 and the first upper reservoir inlet / outlet 51 are connected above the water diversion upper horizontal section construction branch tunnel 11, and the pressure pipe shaft 6 and the high-pressure pipe upper horizontal section 71 are connected below the water diversion upper horizontal section construction branch tunnel 11; the water diversion upper horizontal section construction branch tunnel 11 and the first exploration horizontal tunnel branch tunnel 31 are connected through the first emergency drainage tunnel 21 and the first emergency drainage hole 22, so that the rock seepage, construction wastewater and rainwater passing through the first upper reservoir inlet / outlet 51 under abnormal circumstances above the water diversion upper horizontal section construction branch tunnel 11 pass through the first water diversion tunnel 41 and flow into the water diversion upper horizontal section construction branch tunnel 11, and then flow into the first emergency drainage tunnel 21 by gravity, and flow into the first exploration horizontal tunnel branch tunnel 31 by gravity through the first emergency drainage hole 22, and finally flow out by gravity through the exploration horizontal tunnel main tunnel 33 (the arrow in the figure indicates the direction of water flow).

[0042] By setting up emergency drainage holes and connecting the water diversion system construction branch tunnel, emergency drainage tunnel and exploration tunnel branch tunnel, the "one tunnel for multiple uses" of the exploration tunnel is realized, the utilization rate of the exploration tunnel is improved, the tunnel excavation work volume and pumping costs are reduced, investment is saved, the underground engineering construction working environment is improved, and the engineering safety risks are reduced.

[0043] Example 3

[0044] Different from Embodiment 1 and Embodiment 2, in this embodiment, according to Figure 3-4 As shown, the construction branch tunnel of the water diversion system includes a water diversion middle section construction branch tunnel 12, which is connected to the water diversion upper section construction branch tunnel 11, and a second emergency drainage tunnel 23 is arranged on one side of the water diversion middle section construction branch tunnel 12, the starting elevation of the second emergency drainage tunnel 23 is higher than the end elevation, and the starting point of the second emergency drainage tunnel 23 intersects with the lowest point of the water diversion middle section construction branch tunnel 12;

[0045] The end point of the second emergency drainage hole 23 is located above the second exploration flat tunnel branch hole 32, and a second emergency drainage hole 24 is provided. In this embodiment, a drilling device can also be used to perform drilling construction of the second emergency drainage hole 24. The diameter of the second emergency drainage hole 24 can be 200 mm-250 mm. The second emergency drainage hole 24 is connected to the second exploration flat tunnel branch hole 32;

[0046] The water diversion medium-level construction branch tunnel 12 is connected with the second water diversion tunnel 42, the second upper reservoir inlet / outlet 52, and the high-pressure pipeline medium-level section 72 to divert water; the water diversion medium-level construction branch tunnel 12 and the second exploration flat tunnel branch tunnel 32 are connected through the second emergency drainage tunnel 23 and the second emergency drainage hole 24, so that the rock seepage, construction wastewater and rainwater passing through the second upper reservoir inlet / outlet 52 under abnormal circumstances above the water diversion medium-level construction branch tunnel 12 pass through the second water diversion tunnel 42 and the high-pressure pipeline medium-level section 72, flow into the water diversion medium-level construction branch tunnel 12, and then flow into the second emergency drainage tunnel 23 by gravity, and flow into the second exploration flat tunnel branch tunnel 32 by gravity through the second emergency drainage hole 24, and finally flow out by gravity through the exploration flat tunnel main tunnel 33 (the arrow in the figure is the direction of water flow).

[0047] It should be noted that the construction branch tunnels of the upper horizontal section of water diversion and the construction branch tunnels of the middle horizontal section of water diversion are set up for the construction of the water diversion system. In some water diversion systems, the upper horizontal section of water diversion, the middle horizontal section of water diversion and the lower horizontal section of water diversion are included. The horizontal sections are connected by inclined shafts or vertical shafts, and each horizontal section needs to be equipped with a construction branch tunnel, including the construction branch tunnel of the upper horizontal section of water diversion, the construction branch tunnel of the middle horizontal section of water diversion and the construction branch tunnel of the lower horizontal section of water diversion; in some water diversion systems, only the upper horizontal section of water diversion and the lower horizontal section of water diversion are included. The horizontal sections are connected by inclined shafts or vertical shafts, and each horizontal section is equipped with a construction branch tunnel, including the construction branch tunnel of the upper horizontal section of water diversion and the construction branch tunnel of the lower horizontal section of water diversion.

[0048] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the application scope of the present invention shall be included in the protection scope of the present invention.

Claims

1. An underground powerhouse layout structure using an exploration flat tunnel to set up an emergency drainage tunnel, characterized in that: Including the construction branch tunnel of the water diversion system, the emergency drainage tunnel and the exploration tunnel near the underground powerhouse; The starting elevation of the exploration flat tunnel is lower than the end elevation and can drain by gravity. The starting elevation of the emergency drainage tunnel is higher than the end elevation. The starting point of the emergency drainage tunnel intersects with the lowest point of the water diversion system construction branch tunnel, and the end point of the emergency drainage tunnel is connected to the exploration flat tunnel.

2. The arrangement structure of the underground powerhouse using the exploration flat tunnel to set up the emergency drainage tunnel according to claim 1 is characterized in that: The water diversion system construction branch tunnels include the water diversion upper horizontal section construction branch tunnel and the water diversion middle horizontal section construction branch tunnel.

3. The arrangement structure of the underground powerhouse using the exploration flat tunnel to set up the emergency drainage hole according to claim 2 is characterized in that: The emergency drainage hole includes a first emergency drainage hole, a first emergency drainage hole, a second emergency drainage hole, and a second emergency drainage hole; The starting point elevation of the first emergency drainage tunnel is higher than the ending point elevation, and the starting point of the first emergency drainage tunnel intersects with the lowest point of the construction branch tunnel of the upper horizontal section of the water diversion; The first emergency drainage hole is located at the end of the first emergency drainage hole; The starting point elevation of the second emergency drainage tunnel is higher than the ending point elevation, and the starting point of the second emergency drainage tunnel intersects with the lowest point of the construction branch tunnel of the horizontal section of the water diversion; The second emergency drainage hole is located at the end of the second emergency drainage hole.

4. The arrangement structure of the underground powerhouse using the exploration flat tunnel to set up the emergency drainage hole according to claim 3 is characterized in that: The exploration adit includes a first exploration adit branch cave, a second exploration adit branch cave and an exploration adit main cave; The first exploration flat tunnel branch hole and the second exploration flat tunnel branch hole are both connected to the exploration flat tunnel main hole, and the elevations of the first exploration flat tunnel branch hole and the second exploration flat tunnel branch hole are both higher than the elevation of the exploration flat tunnel main hole.

5. The arrangement structure of the underground powerhouse using the exploration flat tunnel to set up the emergency drainage hole according to claim 4 is characterized in that: The first exploration adit branch hole is located below the first emergency drainage hole and is connected through the first emergency drainage hole.

6. The arrangement structure of the underground powerhouse using the exploration flat tunnel to set up the emergency drainage hole according to claim 4 is characterized in that: The second exploration adit branch tunnel is located below the second emergency drainage tunnel and is connected through the second emergency drainage hole.

7. The arrangement structure of the emergency drainage hole in the underground powerhouse using the exploration flat hole according to any one of claims 1 to 6 is characterized in that: The longitudinal slope range of the branch tunnel for the water diversion system construction is [0.3%, 9%].

8. The arrangement structure of the emergency drainage hole in the underground powerhouse using the exploration flat hole according to any one of claims 1 to 6 is characterized in that: The emergency drainage hole is in the shape of a city gate hole, and the cross-sectional dimensions are within a preset range. The support type and support parameters of the emergency drainage hole are determined according to geological conditions.

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