CN218373716U - Sand-blocking and water-binding system for head junction of hydropower station - Google Patents
Sand-blocking and water-binding system for head junction of hydropower station Download PDFInfo
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- CN218373716U CN218373716U CN202222716589.8U CN202222716589U CN218373716U CN 218373716 U CN218373716 U CN 218373716U CN 202222716589 U CN202222716589 U CN 202222716589U CN 218373716 U CN218373716 U CN 218373716U
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Abstract
The utility model belongs to the technical field of hydraulic and hydroelectric engineering, specifically a sand-blocking and water-binding system for hydropower station head pivot that sand washing is effectual and the cost is lower. The sand-blocking and water-restraining system can form an effective water diversion and sand prevention facility with a sand-blocking bank, a water intake and a sand washing gate through the arranged mesh screen type slag-blocking wall, is suitable for being applied to a head junction of a hydropower station to divert water and prevent sand, and is particularly suitable for being applied to a sediment river with a large gradient; because the sand blocking and water binding system can effectively block large-particle-size bed ballast through the mesh screen type slag blocking wall, and can effectively prevent the sand from entering the water intake together with the sand blocking ridge, the 'door-to-door cleaning' of the water intake is ensured, the sand flushing effect is good, and a slag blocking dam does not need to be arranged at the tail of the upstream reservoir of the head part and the hub of the hydropower station, so that the engineering arrangement is simple, the construction is convenient, the manufacturing cost is low, the construction period can be saved, and the investment is saved.
Description
Technical Field
The utility model belongs to the technical field of hydraulic and hydroelectric engineering, concretely relates to sediment trapping and water restraining system for power station prelude pivot.
Background
For rivers with steep gradient, much sediment and rich solid runoff, the problem of diversion and sand prevention of a junction at the head of a hydropower station is very outstanding, and a water intake is generally arranged on a river channel bank, and a sand flushing gate is arranged at a deep groove part of the river channel to form an arrangement mode of lateral diversion and positive sand flushing.
As shown in fig. 1, the hydroelectric station gate dam generally includes water retaining dam sections 210 respectively disposed on a convex bank and a concave bank of a river channel, and further includes an overflow dam 220, a sand wash gate 230 and a water intake 240 sequentially disposed between the water retaining dam sections 210 along a cross river direction. The sand-blocking and water-restraining system is a facility for solving the problems of water diversion and sand prevention of a hub at the head of a hydropower station; as further shown in fig. 1, the conventional sand trap system includes a trap wall 330 and a sand trap sill 310; the water-binding wall 330 is arranged in the upstream reservoir 100 perpendicularly to the dam axis, and the downstream end thereof is connected to a portion between the overflow dam 220 and the sand sluicegate 230 and separates the water flow of the overflow dam 220 from the sand sluicegate 230; the sand trap 310 is arranged in front of the water intake 240 and in the area between the water-restraining wall 330 and the river channel concave bank, and is used for preventing upstream silt from entering the water intake 240; the slit formed between the downstream end of the sand trap 310 and the water-binding wall 330 corresponds to the inlet of the sand lock 230.
In the existing sand-blocking water-restraining system, the water restraining wall 330 is arranged perpendicular to the axis of the dam, so that part of the pushed sediment is inevitably conveyed to the front of the sand-blocking ridge 310; particularly for rivers with a narrow river valley and rich solid runoff, the diameter of the solid runoff source can reach several meters, and the water intake 240 is blocked by the solid runoff source in such a scale before the solid runoff source reaches the water intake 240, and even more, the water confinement wall 330 and the sand-blocking ridge 310 are damaged; therefore, in order to ensure the sand washing effect of the head junction of the hydropower station, the existing sand-blocking water-binding system needs to arrange a slag-blocking dam 340 at the upstream end and the tail end of the head junction of the hydropower station so as to block the large-particle-size load from approaching the head junction.
However, in the existing sand-blocking and water-binding system, in addition to the water-binding wall 330 and the sand-blocking bank 310 which need to be arranged in front of the dam, a slag-blocking dam 340 needs to be arranged at the tail of the reservoir upstream of the head junction, so that the sand-blocking and water-binding system is complex in engineering arrangement, construction and diversion, high in construction difficulty and high in construction cost.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a sand blocking beam water system that is used for power station prelude pivot that sand washing is effectual and the cost is lower.
The utility model provides a technical scheme that its technical problem adopted is: a sand-blocking and water-binding system for a head junction of a hydropower station comprises a sand-blocking ridge arranged at the upstream of a water intake and further comprises a mesh screen type slag-stopping wall, the mesh screen type slag-stopping wall is arranged in an upstream reservoir, the downstream end of the mesh screen type slag-stopping wall is connected with a part between a sand-washing gate and an overflow dam, and the included angle theta between the axis of the mesh screen type slag-stopping wall and the axis of the sand-washing gate is 60-80 degrees.
The mesh screen type slag blocking wall is provided with sand discharging holes, the sand discharging holes are inclined holes, and the hole ends, close to the sand blocking ridge, of the sand discharging holes are higher than the hole ends, far away from the sand blocking ridge, of the sand blocking ridge.
The sand discharge holes are at least two rows, each row comprises at least two sand discharge holes which are distributed at intervals along the axial direction of the mesh screen type slag blocking wall, and the sand discharge holes in any two adjacent rows are distributed in a staggered mode.
Further, the method comprises the following steps: the bottom plate of the water intake is higher than the bottom plate of the sand sluice by more than 5.5m, and the ridge top of the sand blocking ridge is higher than the bottom plate of the water intake by more than 0.5 m.
Further, the method comprises the following steps: the wall top of the mesh screen type slag blocking wall is higher than the ridge top of the sand blocking ridge by more than 2.5m, and the wall top of the mesh screen type slag blocking wall is higher than the normal water storage level of the upstream reservoir by more than 1 m.
Further, the method comprises the following steps: the mesh screen type slag blocking wall comprises a bottom plate, a wall main body arranged on the bottom plate and a top beam arranged at the top end of the wall main body, wherein the sand discharge hole is formed in the wall main body.
Further, the method comprises the following steps: the cross section of the wall main body is a trapezoidal surface with a narrow upper part and a wide lower part.
Further, the method comprises the following steps: the side face of the wall main body close to the sand blocking ridge is a vertical face, and the side face of the wall main body far away from the sand blocking ridge is an inclined face.
Further, the method comprises the following steps: the inclined gradient of the sand discharge hole is 15%.
Further, the method comprises the following steps: the cross section of the sand discharge hole is rectangular.
The utility model has the advantages that: the sand-blocking and water-restraining system can form an effective water diversion and sand prevention facility with a sand-blocking bank, a water intake and a sand washing gate through the arranged mesh screen type slag-blocking wall, is suitable for being applied to a head junction of a hydropower station to divert water and prevent sand, and is particularly suitable for being applied to a sediment river with a large gradient; the included angle theta between the axis of the mesh screen type slag blocking wall and the axis of the sand washing gate is 60-80 degrees, so that most of the migrated silt can be blocked in front of the sand blocking ridge; meanwhile, at least two rows of sand discharge holes which are distributed in a staggered manner are arranged on the mesh screen type slag blocking wall, and the sand discharge holes are inclined holes, wherein the hole ends close to the sand blocking ridges are higher than the hole ends far away from the sand blocking ridges, so that on one hand, water flow can be allowed to pass through the mesh screen type slag blocking wall to supply water to a water intake, and on the other hand, when the water flow passes through the sand discharge holes, most of carried silt flows back along the inclined direction of the sand discharge holes, and only a small part of silt flows to the front of the sand blocking ridges; in addition, the sand blocking and water binding system can effectively block large-particle-size bed ballast through the mesh screen type slag blocking wall, can effectively prevent the sand from entering the water intake together with the sand blocking ridge, ensures that the water intake is clear before the door, and has good sand flushing effect, so that a slag blocking dam does not need to be arranged at the tail of the upstream reservoir of the head part and the hub of the hydropower station, the engineering arrangement is simple, the construction is convenient, the manufacturing cost is low, the construction period can be saved, and the investment can be saved.
Drawings
Fig. 1 is a plan layout of a prior art sand-blocking water-restraining system at a head hub of a hydroelectric power plant.
Fig. 2 is a plan view of the present invention.
Fig. 3 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2.
Fig. 4 is a sectional view taken along line B-B of fig. 2.
Labeled in the figure as: the system comprises an upstream reservoir 100, a normal impoundment level 110, a water retaining dam section 210, an overflow dam 220, a sand flushing gate 230, a water intake 240, a sand blocking bank 310, a mesh screen type slag blocking wall 320, a sand discharge hole 321, a bottom plate 322, a wall main body 323, a top beam 324, a water restraining wall 330 and a slag blocking dam 340; the direction of the arrows in fig. 1 and 2 indicates the direction of flow of the water.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "upstream", "downstream", "top", "bottom", "inner", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the mechanism or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Referring to fig. 2, 3 and 4, the sand-blocking and water-binding system for the head junction of the hydropower station comprises a sand-blocking sill 310 arranged at the upstream of the water intake 240 and a mesh screen type slag-stopping wall 320, wherein the mesh screen type slag-stopping wall 320 is arranged in the upstream reservoir 100, the downstream end of the mesh screen type slag-stopping wall is connected with the position between the sand-washing gate 230 and the overflow dam 220, and the included angle theta between the axis of the mesh screen type slag-stopping wall and the axis of the sand-washing gate 230 is 60-80 degrees.
The mesh screen type slag blocking wall 320 is provided with sand discharge holes 321, the sand discharge holes 321 are inclined holes, and the hole ends of the sand discharge holes 321 close to the sand blocking sill 310 are higher than the hole ends of the sand blocking sill 310 far away from the sand blocking sill; the inclination of the sand discharge holes 321 is generally determined according to the silt content of the river, the number of the sand discharge holes 321 and other factors, and preferably, the inclination of the sand discharge holes 321 is 15%; the cross-section of the sand discharge hole 321 can be in various shapes and structures, such as: circular, oval, polygonal and the like, preferably rectangular, so that the construction is convenient, and the sand discharge holes 321 can be ensured to have good water and sand discharge effects.
The sand discharge holes 321 are at least two rows, each row comprises at least two sand discharge holes 321 which are distributed at intervals along the axial direction of the mesh screen type slag blocking wall 320, and the sand discharge holes 321 in any two rows which are adjacent up and down are distributed in a staggered mode; the sand discharge holes 321 are arranged in three rows in the embodiment of fig. 4.
The sand-blocking and water-binding system is characterized in that the mesh screen type slag-blocking wall 320 is arranged, the included angle theta between the axis of the mesh screen type slag-blocking wall 320 and the axis of the sand-flushing gate 230 is 60-80 degrees, at least two rows of sand-discharging holes 321 which are distributed in a staggered manner are arranged on the mesh screen type slag-blocking wall 320, the sand-discharging holes 321 are inclined holes, the hole end close to the sand-blocking bank 310 is higher than the hole end far away from the sand-blocking bank 310, therefore, most upstream large-particle-diameter bed load and river water flow can be guided to the front of the overflow dam 220, only the fine-particle bed load and the water flow are discharged into a sand settling tank formed by the mesh screen type slag-blocking wall 320, the water intake 240 and the sand-blocking bank 310 through the sand-discharging holes 321, the water is bundled to attack the sand, and when the water flow passes through the sand discharge hole 321, most of carried silt flows back along the inclined direction of the sand discharge hole 321, only a small part of the silt flows to the front of the sand blocking ridge 310, and the particle size of the part of the silt is smaller, so that a good sand washing effect can be achieved, the silt is effectively prevented from entering the water intake 240, the 'door-ahead cleaning' of the water intake 240 is ensured, the abrasion damage of the machine-passing silt to the water turbine is reduced, and the slag blocking dam 340 does not need to be arranged at the tail of the reservoir at the upper part of the head pivot of the hydropower station, so that the engineering arrangement is simple, the construction is convenient, the manufacturing cost is low, the construction period can be saved, and the investment is saved; therefore, the sand-blocking and water-restraining system is suitable for being applied to a head junction of a hydropower station for water diversion and sand prevention, and is particularly suitable for being applied to silt rivers with steep gradient.
Specifically, the bottom plate of the water intake 240 is higher than the bottom plate of the sand sluice 230 by more than 5.5m, and the sill top of the sand trap sill 310 is higher than the bottom plate of the water intake 240 by more than 0.5m; so, can ensure good water intaking effect and sand blocking effect, can effectively intercept the promotion matter silt before reaching water intaking mouth 240.
In order to ensure that the mesh type slag blocking wall 320 has the best effect of blocking large particle size bed load, it is preferable that the wall top of the mesh type slag blocking wall 320 is higher than the bank top of the sand-blocking bank 310 by 2.5m or more and the wall top of the mesh type slag blocking wall 320 is higher than the normal water storage level 110 of the upstream reservoir 100 by 1m or more.
In order to improve the slag-stopping effect of the mesh screen type slag-stopping wall 320 and ensure the structural strength thereof, as shown in fig. 3, the mesh screen type slag-stopping wall 320 includes a bottom plate 322, a wall main body 323 arranged on the bottom plate 322, and a top beam 324 arranged at the top end of the wall main body 323, and the sand discharge holes 321 are arranged on the wall main body 323. The bottom plate 322 is a base part of the mesh-type slag trap 320, the wall body 323 is a body part of the mesh-type slag trap 320, and the top beam 324 is a top part of the mesh-type slag trap 320, and the bottom plate 322, the wall body 323, and the top beam 324 are generally integrally cast.
In order to further enhance the overall structural strength of the mesh-type slag trap wall 320, it is preferable that the cross-section of the wall main body 323 is a trapezoidal shape having a narrow top and a wide bottom, as shown in fig. 3.
Specifically, the side surface of the wall main body 323 close to the sediment trap 310 is a vertical surface, and the side surface thereof far from the sediment trap 310 is an inclined surface; therefore, the side surface of the wall main body 323 away from the sand trap 310 can be ensured to have good slag blocking and flow guiding effects, so that most of upstream large-particle-size bed load and river water flow can be smoothly guided to the front of the overflow dam 220.
Specifically, the row spacing of the sand discharge holes 321 is 1.2m, the hole spacing of the sand discharge holes 321 in each row is 1.8m, and the distance between the sand discharge hole 321 in the bottommost row and the bottom plate 322 is 0.5m; thus, the mesh screen type slag blocking wall 320 can be ensured to have the best water and sand passing effect. The sand discharge holes 321 are preferably square with cross-sectional dimensions of 0.8m x 0.8 m.
Claims (8)
1. A sediment trapping and water restraining system for power station headquarters, including setting up sediment trapping bank (310) in intake (240) upstream, its characterized in that: the device also comprises a mesh screen type slag-stopping wall (320), wherein the mesh screen type slag-stopping wall (320) is arranged in the upstream reservoir (100), the downstream end of the mesh screen type slag-stopping wall is connected with a part between the sand-washing gate (230) and the overflow dam (220), and the included angle theta between the axis of the mesh screen type slag-stopping wall and the axis of the sand-washing gate (230) is 60-80 degrees;
the mesh screen type slag blocking wall (320) is provided with sand discharge holes (321), the sand discharge holes (321) are inclined holes, and the hole ends of the sand discharge holes (321) close to the sand blocking ridge (310) are higher than the hole ends of the sand discharge holes (321) far away from the sand blocking ridge (310);
the sand discharge holes (321) are at least two rows, each row comprises at least two sand discharge holes (321) which are distributed at intervals along the axial direction of the mesh screen type slag blocking wall (320), and the sand discharge holes (321) in any two adjacent rows are distributed in a staggered mode.
2. The sand trap system as defined in claim 1 for a hydro-power station headpiece, wherein: the bottom plate of the water intake (240) is higher than the bottom plate of the sand sluice (230) by more than 5.5m, and the sill top of the sand blocking sill (310) is higher than the bottom plate of the water intake (240) by more than 0.5 m.
3. The sand barrage system for a head terminal of a hydroelectric power station as claimed in claim 2 wherein: the wall top of the mesh screen type slag blocking wall (320) is higher than the ridge top of the sand blocking ridge (310) by more than 2.5m, and the wall top of the mesh screen type slag blocking wall (320) is higher than the normal water storage level (110) of the upstream reservoir (100) by more than 1 m.
4. A sand stop and water restraining system for a hydroelectric station head terminal according to any one of claims 1 to 3 wherein: the mesh screen type slag blocking wall (320) comprises a bottom plate (322), a wall main body (323) arranged on the bottom plate (322) and a top beam (324) arranged at the top end of the wall main body (323), wherein the sand discharge holes (321) are formed in the wall main body (323).
5. The sand barrage system for a head terminal of a hydroelectric power station as claimed in claim 4 wherein: the cross section of the wall main body (323) is a trapezoidal surface with a narrow upper part and a wide lower part.
6. The sand barrage system for a head terminal of a hydroelectric power station as claimed in claim 5 wherein: the side face, close to the sand blocking sill (310), of the wall main body (323) is a vertical face, and the side face, far away from the sand blocking sill (310), of the wall main body is an inclined face.
7. The system of claim 4 for a sand trap system for a hydro-power station headpiece, wherein: the inclined gradient of the sand discharge holes (321) is 15 percent.
8. The sand barrage system as defined in claim 7 for a hydroelectric station headquarters terminal wherein: the cross section of the sand discharge hole (321) is rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222716589.8U CN218373716U (en) | 2022-10-14 | 2022-10-14 | Sand-blocking and water-binding system for head junction of hydropower station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222716589.8U CN218373716U (en) | 2022-10-14 | 2022-10-14 | Sand-blocking and water-binding system for head junction of hydropower station |
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| Publication Number | Publication Date |
|---|---|
| CN218373716U true CN218373716U (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222716589.8U Active CN218373716U (en) | 2022-10-14 | 2022-10-14 | Sand-blocking and water-binding system for head junction of hydropower station |
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| CN (1) | CN218373716U (en) |
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- 2022-10-14 CN CN202222716589.8U patent/CN218373716U/en active Active
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