Deep tail water channel structure arranged in downstream river channel of hydropower station workshop

Abstract

The utility model discloses a deep tail water channel structure arranged in a downstream river channel of a hydropower station workshop, which comprises a tail water channel arranged in the river channel, the longitudinal slope of the tail water channel is slowed down to the longitudinal slope of the river channel, and the channel bottom elevation of the starting end of the tail water channel is 5-30 meters lower than the riverbed elevation. The height difference between the surface of the tail water channel bottom plate and the surface of the riverbed is gradually reduced, and the tail water channel bottom elevation is consistent with the riverbed elevation when reaching the tail end of the tail water channel. According to the deep tail water channel structure arranged in the downstream river channel of the hydropower station workshop, it is guaranteed that power generation water heads are increased, and it can be guaranteed that tail water is smoothly discharged into the river channel.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the water conservancy structure technical field in hydropower engineering relates to the deep tail water channel structure that is arranged in the downstream river channel of hydropower station plant. BACKGROUND

[0002] In the field of hydropower engineering, improving power generation efficiency and ensuring the safety and stability of hydraulic structures has always been the core pursuit. The tail water head height of the power plant directly affects the unit installation elevation and the acquisition of the power generation water head, which in turn plays a key role in power generation. The conventional tail water channel structure has certain limitations in adjusting the tail water head, and it is difficult to effectively reduce the tail water head of the power plant, which limits the unit installation elevation and cannot fully tap the power generation potential, resulting in difficulty in significantly improving the power generation capacity.

[0003] At the same time, as an important hydraulic facility connecting the hydropower station plant and the downstream river channel, the lining structure of the tail water channel needs to face the challenge of groundwater pressure. The traditional tail water channel lining material and method cannot well cope with the groundwater pressure, and the channel lining may be lifted or even damaged, which seriously affects the normal use and durability of the tail water channel.

[0004] In addition, during the flood period, the tail water channel also needs to resist the threat of river flood backflow. The conventional design lacks effective flood control measures, and once the flood backflows into the channel, it will not only affect the normal operation of the power station, but also may cause serious damage to the channel and surrounding facilities. Moreover, at the excavation slope and flood embankment back slope of the tail water channel, due to the lack of reasonable protection measures, seepage damage is easy to occur, which endangers the safety of the embankment and foundation.

[0005] In summary, the existing tail water channel structure has many shortcomings in terms of water head utilization, lining structure stability, flood control and anti-seepage damage, and a new deep tail water channel structure is needed to solve these problems to meet the growing demand for efficient and safe operation of hydropower engineering. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a deep tail water channel structure arranged in the downstream river channel of a hydropower station plant, which can not only increase the power generation water head but also ensure smooth discharge of tail water into the river channel.

[0007] The technical scheme adopted by the utility model is a deep tail water channel structure arranged in the downstream river channel of a hydropower station plant, which includes a tail water channel arranged in the river channel. The longitudinal slope gradient of the tail water channel is slower than that of the river channel. The elevation of the channel bottom at the starting end of the tail water channel is 5-30 meters lower than that of the riverbed. According to the direction from upstream to downstream, the height difference between the surface of the tail water channel bottom plate and the surface of the riverbed gradually decreases, and at the end of the tail water channel, the elevation of the tail water channel bottom is consistent with that of the riverbed.

[0008] The utility model is characterized in that,

[0009] In the excavated section of the tailrace, a footpath with a width of not less than 1 m is arranged every 5-10 m above the channel bottom of the tailrace.

[0010] The slope ratio of the channel in the excavated section of the tailrace is 1:0.5-1:1.5.

[0011] The slope ratio of the channel in the backfilled section of the tailrace is 1:1.5-1:2.5.

[0012] The channel bottom and the channel slope of the tailrace are made of water-permeable concrete, and have a water-permeable concrete lining bottom plate and a water-permeable concrete lining slope respectively.

[0013] A flood control embankment is built on the side of the tailrace facing the river, above the surface of the riverbed.

[0014] On the excavated slope above the water-permeable concrete lining slope of the tailrace on the river side and the back slope of the flood control embankment, a filter geotextile is laid.

[0015] A Reno mattress is further arranged above the filter geotextile.

[0016] The thickness of the Reno mattress is 17 cm, and the specification of the filter geotextile is 100 g / m 2 ~300 g / m 2 .

[0017] The slope ratio of the upstream and downstream slopes of the flood control embankment 6 is 1:1.5-1:3.

[0018] The beneficial effects of the utility model are as follows:

[0019] (1) The utility model is arranged in the downstream river channel of a hydropower station, and a tailrace is arranged to effectively reduce the tailwater head of the power plant, thereby reducing the installation elevation of the unit, and the power station can obtain more power generation water head, so that the power generation capacity is improved. The elevation of the channel bottom at the starting end of the tailrace is generally 5-30 m lower than the elevation of the riverbed, and the elevation of the channel bottom at the end is consistent with the elevation of the riverbed. Such a design not only ensures the increase of the power generation water head, but also ensures that the tailwater can be smoothly discharged into the river channel.

[0020] (2) The tailrace is provided with corresponding water-permeable concrete lining on the channel bottom and the channel slope, which can prevent the channel lining from being lifted by the underground water pressure and avoid damage to the channel.

[0021] (3) The utility model builds a flood control embankment on the side of the deep tailrace facing the river, so as to block the flood in the river channel from flowing into the channel.

[0022] (4) The utility model lays filter geotextile on the excavated slope above the channel lining on the river side of the tailrace and the back slope of the flood control embankment, and arranges a Reno mattress, which can effectively prevent the embankment or foundation from being damaged by seepage. Attached Figure Description

[0023] Fig. 1 This is a cross-sectional view of the starting end of the tailrace channel in the deep tailrace channel structure arranged in the downstream river channel of the hydropower station.

[0024] Fig. 2 This is a cross-sectional view of the tailrace channel end in the deep tailrace channel structure arranged in the downstream river channel of the hydropower station.

[0025] In the diagram: 1. Tailwater channel, 2. Permeable concrete lining channel slope, 3. Permeable concrete lining base plate, 4. Reno mattress, 5. Reverse filter geotextile, 6. Flood control dike, 7. Walkway, 8. Riverbed surface. Detailed Implementation

[0026] The following detailed description is provided in conjunction with specific implementation methods.

[0027] Example 1

[0028] This utility model relates to a deep tailrace channel structure arranged in a river channel downstream of a hydropower station powerhouse, including a tailrace channel 1 arranged in the river channel, such as... Figs. 1-2 As shown, the longitudinal slope of tailrace 1 is gentler than that of the river channel. The bottom elevation of the tailrace 1 at the beginning is 5 to 30 meters lower than the riverbed elevation. From upstream to downstream, the height difference between the bottom surface of tailrace 1 and the riverbed surface 8 gradually decreases. At the end of tailrace 1, the bottom elevation of tailrace 1 is consistent with the riverbed elevation.

[0029] This invention utilizes a tailrace channel in the downstream river channel of a hydropower station to effectively reduce the tailwater head of the power plant, thereby lowering the installation elevation of the generating units. This allows the power station to obtain more head for power generation, thus increasing power output. The bottom elevation of the tailrace channel at its starting point is generally 5 to 30 meters lower than the riverbed elevation, while the bottom elevation at its ending point is consistent with the riverbed elevation. This design ensures both an increase in head for power generation and smooth discharge of tailwater into the river channel.

[0030] Example 2

[0031] This utility model relates to a deep tailrace channel structure arranged in a river channel downstream of a hydropower station powerhouse, including a tailrace channel 1 arranged in the river channel, such as... Figs. 1-2 As shown, the longitudinal slope of tailrace 1 is gentler than that of the river channel. The bottom elevation of the tailrace 1 at the beginning is 5 to 30 meters lower than the riverbed elevation. From upstream to downstream, the height difference between the bottom surface of tailrace 1 and the riverbed surface 8 gradually decreases. At the end of tailrace 1, the bottom elevation of tailrace 1 is consistent with the riverbed elevation.

[0032] The utility model discloses a deep tail water channel structure arranged in the downstream river channel of hydropower station plant, comprising tail water channel 1 arranged in the river channel, as shown in the drawing, the longitudinal slope gradient of tail water channel 1 is slower than the longitudinal slope gradient of the river channel, the channel bottom elevation of the starting end of tail water channel 1 is 5m to 30m lower than the riverbed elevation, according to the direction from upstream to downstream, the height difference between the bottom plate surface of tail water channel 1 and the riverbed surface 8 gradually becomes smaller, when reaching the end of tail water channel 1, the channel bottom elevation of tail water channel 1 is consistent with the riverbed elevation.

[0033] The excavated section of tail water channel 1 is provided with a horse path 7 with a width of not less than 1m every 5m to 10m above the channel bottom of tail water channel 1.

[0034] Example 3

[0035] The utility model discloses a deep tail water channel structure arranged in the downstream river channel of hydropower station plant, comprising tail water channel 1 arranged in the river channel, as shown in the drawing, the longitudinal slope gradient of tail water channel 1 is slower than the longitudinal slope gradient of the river channel, the channel bottom elevation of the starting end of tail water channel 1 is 5m to 30m lower than the riverbed elevation, according to the direction from upstream to downstream, the height difference between the bottom plate surface of tail water channel 1 and the riverbed surface 8 gradually becomes smaller, when reaching the end of tail water channel 1, the channel bottom elevation of tail water channel 1 is consistent with the riverbed elevation. Figs. 1-2 The utility model discloses a deep tail water channel structure arranged in the downstream river channel of hydropower station plant, comprising tail water channel 1 arranged in the river channel, as shown in the drawing, the longitudinal slope gradient of tail water channel 1 is slower than the longitudinal slope gradient of the river channel, the channel bottom elevation of the starting end of tail water channel 1 is 5m to 30m lower than the riverbed elevation, according to the direction from upstream to downstream, the height difference between the bottom plate surface of tail water channel 1 and the riverbed surface 8 gradually becomes smaller, when reaching the end of tail water channel 1, the channel bottom elevation of tail water channel 1 is consistent with the riverbed elevation.

[0036] The excavated section of tail water channel 1 is provided with a horse path 7 with a width of not less than 1m every 5m to 10m above the channel bottom of tail water channel 1.

[0037] The inner slope slope ratio of the excavated section of tail water channel 1 is 1:0.5~1:1.5, and is determined according to geological survey information.

[0038] The inner slope slope ratio of the backfill section of tail water channel 1 is 1:1.5~1:2.5, and is determined according to geological survey information.

[0039] Example 4

[0040] The utility model discloses a deep tail water channel structure arranged in the downstream river channel of hydropower station plant, comprising tail water channel 1 arranged in the river channel, as shown in the drawing, the longitudinal slope gradient of tail water channel 1 is slower than the longitudinal slope gradient of the river channel, the channel bottom elevation of the starting end of tail water channel 1 is 5m to 30m lower than the riverbed elevation, according to the direction from upstream to downstream, the height difference between the bottom plate surface of tail water channel 1 and the riverbed surface 8 gradually becomes smaller, when reaching the end of tail water channel 1, the channel bottom elevation of tail water channel 1 is consistent with the riverbed elevation.

[0041] Figs. 1-2 ​As shown, the longitudinal slope of tailrace 1 is gentler than that of the river channel. The bottom elevation of the tailrace 1 at the beginning is 5 to 30 meters lower than the riverbed elevation. From upstream to downstream, the height difference between the bottom surface of tailrace 1 and the riverbed surface 8 gradually decreases. At the end of tailrace 1, the bottom elevation of tailrace 1 is consistent with the riverbed elevation.

[0042] This invention utilizes a tailrace channel in the downstream river channel of a hydropower station to effectively reduce the tailwater head of the power plant, thereby lowering the installation elevation of the generating units. This allows the power station to obtain more head for power generation, thus increasing power output. The bottom elevation of the tailrace channel at its starting point is generally 5 to 30 meters lower than the riverbed elevation, while the bottom elevation at its ending point is consistent with the riverbed elevation. This design ensures both an increase in head for power generation and smooth discharge of tailwater into the river channel.

[0043] In the excavation section of tailrace 1, a walkway 7 with a width of not less than 1m is set every 5m to 10m above the bottom of tailrace 1.

[0044] The slope ratio of the excavated section of tailrace channel 1 is 1:0.5 to 1:1.5, which will be determined based on geological survey information.

[0045] The slope ratio of the backfill section of tailrace channel 1 is 1:1.5 to 1:2.5, which will be determined based on geological survey information.

[0046] The bottom and slope of the tailrace channel 1 are constructed with permeable concrete, with a permeable concrete lining base slab 3 and a permeable concrete lining channel slope 2.

[0047] The permeable concrete lining base plate 3 and the permeable concrete lining channel slope 2 can effectively prevent groundwater pressure from lifting the channel lining, avoid damage to the channel, and greatly improve the stability and durability of the tailrace channel lining structure.

[0048] Example 5

[0049] This utility model relates to a deep tailrace channel structure arranged in a river channel downstream of a hydropower station powerhouse, including a tailrace channel 1 arranged in the river channel, such as... Figs. 1-2 As shown, the longitudinal slope of tailrace 1 is gentler than that of the river channel. The bottom elevation of the tailrace 1 at the beginning is 5 to 30 meters lower than the riverbed elevation. From upstream to downstream, the height difference between the bottom surface of tailrace 1 and the riverbed surface 8 gradually decreases. At the end of tailrace 1, the bottom elevation of tailrace 1 is consistent with the riverbed elevation.

[0050] This invention utilizes a tailrace channel in the downstream river channel of a hydropower station to effectively reduce the tailwater head of the power plant, thereby lowering the installation elevation of the generating units. This allows the power station to obtain more head for power generation, thus increasing power output. The bottom elevation of the tailrace channel at its starting point is generally 5 to 30 meters lower than the riverbed elevation, while the bottom elevation at its ending point is consistent with the riverbed elevation. This design ensures both an increase in head for power generation and smooth discharge of tailwater into the river channel.

[0051] In the excavation section of tailrace 1, a walkway 7 with a width of not less than 1m is set every 5m to 10m above the bottom of tailrace 1.

[0052] The slope ratio of the excavated section of tailrace channel 1 is 1:0.5 to 1:1.5, which will be determined based on geological survey information.

[0053] The slope ratio of the backfill section of tailrace channel 1 is 1:1.5 to 1:2.5, which will be determined based on geological survey information.

[0054] The bottom and slope of the tailrace channel 1 are constructed with permeable concrete, with a permeable concrete lining base slab 3 and a permeable concrete lining channel slope 2.

[0055] The permeable concrete lining base plate 3 and the permeable concrete lining channel slope 2 can effectively prevent groundwater pressure from lifting the channel lining, avoid damage to the channel, and greatly improve the stability and durability of the tailrace channel lining structure.

[0056] A flood control dike 6 is built on the side of the tailrace channel facing the river above the riverbed surface 8. This dike can prevent river floods from flowing back into the channel, thus effectively ensuring the normal operation of the power station during the flood season.

[0057] The slope ratio of the upstream and downstream sides of the flood control dike 6 is 1:1.5 to 1:3, depending on the type of fill material and the stability of the dike. The relative density after compaction is greater than or equal to 0.75.

[0058] Example 6

[0059] This utility model relates to a deep tailrace channel structure arranged in a river channel downstream of a hydropower station powerhouse, including a tailrace channel 1 arranged in the river channel, such as... Figs. 1-2 As shown, the longitudinal slope of tailrace 1 is gentler than that of the river channel. The bottom elevation of the tailrace 1 at the beginning is 5 to 30 meters lower than the riverbed elevation. From upstream to downstream, the height difference between the bottom surface of tailrace 1 and the riverbed surface 8 gradually decreases. At the end of tailrace 1, the bottom elevation of tailrace 1 is consistent with the riverbed elevation.

[0060] The utility model discloses a tailrace channel is set up in the downstream river of hydropower station plant, effectively reduces the tailrace water head of power plant, and further reduces the unit installation elevation, and the hydropower station can obtain more power generation water head, realizes the promotion of power generation, and the channel bottom elevation of tailrace channel starting end is generally lower than the riverbed elevation by 5m to 30m, and the channel bottom elevation of tail end is consistent with the riverbed elevation, and such design guarantees the increase of power generation water head, and can ensure that tailrace flows into the river smoothly.

[0061] The excavated section of the tailrace channel 1 is provided with a footpath 7 with a width of not less than 1m every 5m to 10m above the channel bottom of the tailrace channel 1.

[0062] The inner slope ratio of the excavated section of the tailrace channel 1 is 1:0.5 to 1:1.5, and is determined according to geological survey information.

[0063] The inner slope ratio of the backfill section of the tailrace channel 1 is 1:1.5 to 1:2.5, and is determined according to geological survey information.

[0064] The channel bottom and the channel slope of the tailrace channel 1 are made of water-permeable concrete and are provided with a water-permeable concrete lining bottom plate 3 and a water-permeable concrete lining channel slope 2.

[0065] The water-permeable concrete lining bottom plate 3 and the water-permeable concrete lining channel slope 2 can effectively prevent the channel lining from being lifted by underground water pressure and avoid the damage of the channel, greatly improving the stability and durability of the lining structure of the tailrace channel.

[0066] The side of the tailrace channel 1 facing the river is provided with a flood control dike 6 above the riverbed surface 8, which can block the flood of the river channel from flowing into the channel, and effectively ensures the normal operation of the power station in the flood period.

[0067] The excavated slope above the water-permeable concrete lining channel slope 2 of the tailrace channel 1 and the back slope of the flood control dike 6 on the side close to the river are both paved with a filter geotextile 5. A Reno mattress 4 is further arranged above the filter geotextile 5. The thickness of the Reno mattress 4 is 17cm, and the specification of the filter geotextile 5 is 100g / m 2 ~300g / m 2 The arrangement of the Reno mattress 4 and the filter geotextile 5 can effectively prevent the seepage damage of the dike or foundation, and ensure the safety of the whole deep tailrace channel structure.

[0068] The utility model discloses a tailrace channel is set up in the downstream river of hydropower station plant, effectively reduces the tailrace water head of power plant, and further reduces the unit installation elevation, and the hydropower station can obtain more power generation water head, realizes the promotion of power generation, and the channel bottom elevation of tailrace channel starting end is generally lower than the riverbed elevation by 5m to 30m, and the channel bottom elevation of tail end is consistent with the riverbed elevation, and such design guarantees the increase of power generation water head, and can ensure that tailrace flows into the river smoothly.

Claims

1. A deep tailrace structure arranged in a river channel downstream of a hydropower plant powerhouse, characterized in that, The tailrace channel (1) is arranged in the river channel, the longitudinal slope gradient of the tailrace channel (1) is slower than that of the river channel, the bottom elevation of the tailrace channel (1) at the starting end is 5-30m lower than the riverbed elevation, the height difference between the bottom surface of the tailrace channel (1) and the riverbed surface (8) gradually decreases in the direction from upstream to downstream, and the bottom elevation of the tailrace channel (1) is consistent with the riverbed elevation at the end of the tailrace channel (1).

2. The deep tailrace structure arranged in the downstream river channel of a hydropower plant house according to claim 1, characterized in that, A footpath (7) with a width of not less than 1m is arranged every 5-10m above the bottom of the tailrace channel (1) at the excavation section of the tailrace channel (1).

3. The deep tailrace structure arranged in the downstream river channel of a hydropower station powerhouse according to claim 1, characterized in that, The inner slope slope ratio of the tailrace channel (1) at the excavation section is 1:0.5-1:1.

5.

4. The deep tailrace structure arranged in a downstream river channel of a hydropower plant house according to claim 1, characterized in that, The inner slope slope ratio of the tailrace channel (1) at the backfill section is 1:1.5-1:2.

5.

5. The deep tailrace structure arranged in the downstream river channel of a hydropower plant house according to claim 1, characterized in that, The tailrace channel (1) is made of water-permeable concrete, and the bottom and the slope of the tailrace channel (1) are respectively provided with a water-permeable concrete lining bottom plate (3) and a water-permeable concrete lining slope (2).

6. The deep tailrace structure arranged in a downstream river channel of a hydropower plant according to claim 5, characterized in that, The side of the tailrace channel (1) facing the river is provided with a flood control embankment (6) above the riverbed surface (8).

7. The deep tailrace structure arranged in a downstream river channel of a hydropower plant according to claim 6, characterized in that, The excavation slope above the water-permeable concrete lining slope (2) of the tailrace channel (1) and the back slope of the flood control embankment (6) are both paved with a reverse filtration geotextile (5) on the side of the tailrace channel (1) close to the river.

8. The deep tailrace structure arranged in a downstream river channel of a hydropower plant according to claim 7, characterized in that, A Reno mat (4) is further arranged above the reverse filtration geotextile (5).

9. The deep tailrace structure arranged in a downstream river channel of a hydropower plant according to claim 8, characterized in that, The thickness of the Reno Pad (4) is 17 cm and the gauge of the geotextile (5) is 100 g / m 2 300 g / m 2 .

10. The deep tailrace structure arranged in a downstream river channel of a hydropower plant powerhouse according to claim 6, characterized in that, The upstream and downstream slope ratios of the flood control embankment (6) are 1:1.5-1:3.

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