Double-exhaust vertical shaft structure of underground powerhouse of pumped storage power station

Abstract

The utility model discloses a pumped storage power station underground powerhouse double-exhaust shaft structure which comprises an exhaust lower adit, an underground exhaust machine room hole, a bottom connecting hole, an exhaust shaft, an exhaust upper adit and a powerhouse road, the exhaust lower adit is connected with the underground exhaust machine room hole, and the bottom connecting hole is arranged at the tail of the underground exhaust machine room hole and the bottom of the exhaust shaft. The exhaust upper adit is arranged at the top of the exhaust vertical shaft and is adjacent to a factory road, the exhaust vertical shaft comprises a first exhaust vertical shaft and a second exhaust vertical shaft which are arranged side by side, and the diameter of the first exhaust vertical shaft and the diameter of the second exhaust vertical shaft are the same and do not exceed 4.0 m. The two small-section exhaust shafts are arranged, the excavation period of the exhaust shafts is effectively shortened while the exhaust effect is not affected, exhaust in the underground cavern construction period is facilitated, construction conditions are improved, and physical and psychological health and life safety of constructors are facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of underground powerhouse ventilation system building layout and excavation, and in particular to a double exhaust shaft structure for an underground powerhouse of a pumped storage power station. Background Technology

[0002] The ventilation system of a pumped-storage power station mainly consists of underground ventilation tunnels, ventilation shafts, and ventilation fan rooms. The common configurations include: ventilation tunnel + underground ventilation fan room + ventilation shaft; lower ventilation tunnel + underground ventilation fan room + ventilation shaft + upper ventilation tunnel; ventilation tunnel + ventilation shaft + surface ventilation fan room; and ventilation tunnel + surface ventilation fan room. Since most pumped-storage power station buildings are deeply buried underground, ventilation system structures for underground power stations generally require ventilation shafts. The ventilation tunnel + surface ventilation fan room configuration is rarely applicable; therefore, ventilation shaft construction is more common in pumped-storage power stations. Statistics show that the diameter of ventilation shafts in most pumped-storage power stations already built or under construction in my country is between 6m and 10m, and the depth ranges from tens to hundreds of meters. The conventional method for constructing ventilation shafts involves first drilling a pilot hole, then back-reaming to form the pilot shaft, and finally drilling and blasting to enlarge the shaft to the design cross-section. The pilot hole drilling rate is approximately 300m / month, the pilot shaft back-reaming rate is approximately 200m / month, and the drilling and blasting enlargement rate is approximately 60m / month. The drilling and blasting method for shaft enlargement has a long construction period and high safety risks. Currently, the technology of directly back-reaming to the design cross-section using large-diameter drill bits is available, but it is relatively expensive, and there are no implemented cases in the construction of pumped storage power stations in China. Utility Model Content

[0003] The purpose of this utility model is to provide a double exhaust shaft structure for the underground powerhouse of a pumped storage power station. By analyzing and calculating the exhaust volume of the underground powerhouse of the pumped storage power station, the exhaust shaft with a relatively large single cross-section is set up as two smaller cross-sections. This does not affect the exhaust effect, but effectively reduces the excavation period of the exhaust shaft, which helps with the exhaust during the construction of the underground cavern, improves the construction conditions, and is beneficial to the physical and mental health and life safety of the construction personnel.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A double-exhaust shaft structure for an underground powerhouse of a pumped storage power station, comprising a lower exhaust tunnel, an underground exhaust fan room tunnel, a bottom connecting tunnel, an exhaust shaft, an upper exhaust tunnel, and a plant area road. The lower exhaust tunnel is connected to the underground exhaust fan room tunnel. The bottom connecting tunnel is located at the tail of the underground exhaust fan room tunnel and at the bottom of the exhaust shaft. The upper exhaust tunnel is located at the top of the exhaust shaft and adjacent to the plant area road. The exhaust shaft includes a first exhaust shaft and a second exhaust shaft arranged side by side. The first exhaust shaft and the second exhaust shaft have the same diameter and do not exceed 4.0m.

[0005] The ventilation tunnel is connected to the underground ventilation room tunnel, and its bottom slab is set with a reverse slope of 1% to 10% to facilitate the drainage of seepage water from the surrounding rock of the tunnel.

[0006] The front section of the underground ventilation fan room is connected to the lower ventilation tunnel, and the rear section is connected to the bottom connecting tunnel. The ventilation fan room and power distribution room will be arranged inside later.

[0007] The net distance between the first and second exhaust shafts is greater than or equal to twice the diameter of the shafts.

[0008] The road in the plant area is a permanent road for the power station. The road surface elevation at the entrance of the exhaust tunnel is 0.5m lower than the elevation of the floor slab inside the tunnel to prevent water from the road from flowing into the exhaust tunnel and then into the underground plant.

[0009] The beneficial effects of this utility model are as follows: by setting up two small-section ventilation shafts, the drilling and blasting excavation process is eliminated, and the shafts are directly pulled back to the designed cross-section, which reduces the excavation period of the ventilation shafts, lowers the construction safety risks of the shafts, helps with ventilation during the construction of underground caverns, improves construction conditions, and does not affect the ventilation effect of the underground powerhouse during operation. It has broad guiding significance and promotional significance, especially in the construction of underground powerhouses with ventilation shaft heights greater than 300m, where its promotional value is even greater. Attached Figure Description

[0010] Figure 1 This is a cross-sectional schematic diagram of the double-row ventilation shaft structure of the underground powerhouse of the pumped storage power station of this utility model.

[0011] Figure 2 This is a schematic diagram of the double-row ventilation shaft structure of the underground powerhouse of the pumped storage power station according to this utility model.

[0012] In the diagram: 1---Underground ventilation shaft; 2---Underground ventilation room; 3---Bottom connection shaft; 4---First ventilation shaft; 5---Second ventilation shaft; 6---Upper ventilation shaft; 7---Factory area road. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0014] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0015] Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0016] Therefore, features specified with "first," "second," etc., may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figures 1-2 As shown, the present invention relates to a double-exhaust shaft structure for an underground powerhouse of a pumped storage power station, comprising a lower exhaust tunnel 1, an underground exhaust fan room tunnel 2, a bottom connecting tunnel 3, an exhaust shaft, an upper exhaust tunnel 6, and a plant area road 7. The lower exhaust tunnel 1 is connected to the underground exhaust fan room tunnel 2. The bottom connecting tunnel 3 is located at the tail of the underground exhaust fan room tunnel 2 and at the bottom of the exhaust shaft. The upper exhaust tunnel 6 is located at the top of the exhaust shaft and adjacent to the plant area road 7. The exhaust shaft includes a first exhaust shaft 4 and a second exhaust shaft 5 arranged side by side. The first exhaust shaft 4 and the second exhaust shaft 5 have the same diameter and do not exceed 4.0m.

[0019] The ventilation tunnel 1 is connected to the underground ventilation fan room tunnel 2, and its bottom slab is provided with a reverse slope of 1% to 10% to facilitate the drainage of seepage water from the surrounding rock of the tunnel.

[0020] The front section of the underground ventilation fan room tunnel 2 is connected to the lower ventilation tunnel 1, and the rear section is connected to the bottom connecting tunnel 3. The ventilation fan room and power distribution room will be arranged inside later.

[0021] The net distance between the first exhaust shaft 4 and the second exhaust shaft 5 is greater than or equal to twice the diameter of the shaft.

[0022] The plant area road 7 is a permanent road for the power station. The road surface elevation at the entrance of the exhaust tunnel 6 is 0.5m lower than the elevation of the bottom slab inside the tunnel to prevent water from the road from flowing into the exhaust tunnel and then into the underground plant.

[0023] The bottom connecting hole 3 is located at the tail of the underground ventilation fan room hole 2, and its top is connected to the first ventilation shaft 4 and the second ventilation shaft 5. The excavation cross section of the bottom connecting hole 3 is generally smaller than the excavation cross section of the underground ventilation fan room hole 2, but it can also be the same as the excavation cross section of the underground ventilation fan room hole 2 if the layout requires it.

[0024] The first exhaust shaft 4 and the second exhaust shaft 5 have the same diameter and do not exceed 4.0m. The net distance between the two shafts should be greater than or equal to twice the diameter of the shaft. The top of the shaft is provided with interlocking concrete, which is generally 5 to 10m deep and 0.5m thick. The bottom of the shaft and the bottom connecting hole 3 should be provided with interlocking concrete, which can be determined comprehensively according to the geological conditions.

[0025] The fans installed in the underground exhaust fan room 2 draw the circulating air containing dust, harmful gases or accident smoke from the underground plant to the lower exhaust tunnel 1, and then through the first exhaust shaft 4 and the second exhaust shaft 5 to the upper exhaust tunnel 6, and finally out of the plant.

[0026] The following example, using a large-scale pumped storage power station project that adopted the technical solution of this utility model, further illustrates the concept with reference to the accompanying drawings:

[0027] A large-scale pumped storage power station project has an underground powerhouse located in the middle of the water conveyance and power generation system, housing four generating units. The underground powerhouse consists of a main powerhouse, main transformer tunnel, tailgate tunnel, ventilation tunnel, access tunnel, drainage system, exhaust system, and outgoing line system. The excavated dimensions of the underground powerhouse are 164.5m × 24.0m × 54.4m (length × width × height). The double-exhaust ventilation shaft structure of this utility model is adopted for the underground powerhouse.

[0028] like Figures 1-2As shown, the underground plant has a double-exhaust shaft structure, including an exhaust lower horizontal tunnel 1, an underground exhaust fan room tunnel 2, a bottom connecting tunnel 3, a first exhaust shaft 4, a second exhaust shaft 5, an exhaust upper horizontal tunnel 6, and a plant area road 7. The lower exhaust tunnel 1 is connected to the underground exhaust fan room tunnel 2, with a cross-sectional dimension of 7.5m × 6.5m. The underground exhaust fan room tunnel 2 houses 4 fans and a corresponding power distribution room, with a cross-sectional dimension of 18.0m × 10.0m. The bottom connecting tunnel 3 is located at the tail of the underground exhaust fan room tunnel 2, at the bottom of the first exhaust shaft 4 and the second exhaust shaft 5, with a cross-sectional dimension of 10.0m × 10.0m. The first exhaust shaft 4 and the second exhaust shaft 5 have the same diameter of 3.5m and a shaft height of 230m. The upper exhaust tunnel 6 is located at the top of the first exhaust shaft 4 and the second exhaust shaft 5, adjacent to the plant area road 7, with a cross-sectional dimension of 7.5m × 8.0m. The plant area road 7 is Highway 2 of the power station.

[0029] This utility model eliminates the drilling and blasting process by setting up two small-section ventilation shafts, directly pulling them back to the designed cross-section. This reduces the excavation period of the ventilation shafts, lowers the construction safety risks of the shafts, helps with ventilation during the construction of underground caverns, improves construction conditions, and does not affect the ventilation effect of the underground powerhouse during operation.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A double-exhaust shaft structure for an underground powerhouse of a pumped storage power station, comprising a lower exhaust tunnel (1), an underground exhaust fan room tunnel (2), a bottom connecting tunnel (3), an exhaust shaft, an upper exhaust tunnel (6), and a plant area road (7), wherein the lower exhaust tunnel (1) is connected to the underground exhaust fan room tunnel (2), the bottom connecting tunnel (3) is located at the tail of the underground exhaust fan room tunnel (2) and at the bottom of the exhaust shaft, and the upper exhaust tunnel (6) is located at the top of the exhaust shaft and adjacent to the plant area road (7), characterized in that, The exhaust shaft includes a first exhaust shaft (4) and a second exhaust shaft (5) arranged side by side. The first exhaust shaft (4) and the second exhaust shaft (5) have the same diameter and do not exceed 4.0m.

2. The double-row ventilation shaft structure of the underground powerhouse of the pumped storage power station according to claim 1, characterized in that, The ventilation tunnel (1) is connected to the underground ventilation room tunnel (2), and its bottom plate is set with a reverse slope of 1% to 10% to facilitate the drainage of seepage water from the surrounding rock of the tunnel.

3. The double-row ventilation shaft structure of the underground powerhouse of the pumped storage power station according to claim 1, characterized in that, The front section of the underground ventilation fan room tunnel (2) is connected to the ventilation lower horizontal tunnel (1), and the rear section is connected to the bottom connecting tunnel (3). The ventilation fan room and power distribution room will be arranged inside later.

4. The double-row ventilation shaft structure of the underground powerhouse of the pumped storage power station according to claim 1, characterized in that, The net distance between the first exhaust shaft (4) and the second exhaust shaft (5) is greater than or equal to twice the diameter of the shaft.

5. The double-row ventilation shaft structure of the underground powerhouse of the pumped storage power station according to claim 1, characterized in that, The plant area road (7) is a permanent road for the power station. The road surface elevation at the entrance of the exhaust tunnel (6) is 0.5m lower than the elevation of the bottom plate inside the tunnel, so as to prevent water from the road from flowing into the exhaust tunnel and thus into the underground plant.

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