CN211872914U - Hydropower station pivot stone blocking, water permeating and sand guiding device on multi-sand river flow - Google Patents

Abstract

The utility model discloses a hydropower station pivot stone blocking, water permeable and sand guiding device on a multi-sand river, wherein a stone blocking, water permeable and sand guiding wall is arranged between a sand washing gate and an overflow weir, the plane axis of the stone blocking, water permeable and sand guiding wall is arranged along the river in a curve manner, a starting point is connected with the front edge of a partition pier between the sand washing gate and the overflow weir, and a terminal point is connected with a bank slope of a river channel; the wall body structure of the stone-blocking water-permeable sand-guiding wall comprises a wall body foundation and a wall body, wherein the wall body foundation is of a large-volume concrete structure, the wall body is of a high-strength impact-resistant wear-resistant reinforced concrete structure, a protective steel plate and an energy-absorbing rubber base plate are arranged on one side, close to an overflow weir, of the wall body, and a water-permeable sand inlet hole and a stone-blocking grid are arranged on the wall body. The utility model discloses the realization is separated dredging of stone, sand, water in to river course rivers, makes stone, sand, water respectively do its own way. The stone-blocking water-permeable sand-guiding wall is of a high-strength concrete structure, has strong impact damage resistance and forms a protective barrier in front of the sand-washing gate and the water inlet.

Description

Hydropower station pivot stone blocking, water permeating and sand guiding device on multi-sand river flow

Technical Field

The utility model relates to a power station pivot on many sand stone rivers flows blocks stone and leads sand device that permeates water belongs to hydraulic and hydroelectric engineering technical field.

Background

For rivers in high mountain gorge regions, longitudinal slopes of river channels are steep, mud and sand are rich and mostly contain bed load, and large-scale solid runoff with large particle size is easily formed after rock masses on side slopes on two banks collapse. Typically such hydroelectric station head-end hub arrangements on sandstone rivers consist of buildings such as water inlets, sand wash gates, overflow weirs (outlet structures) and connecting dam segments. Wherein the sand washing gate is arranged close to the water inlet to discharge the bed load silt with smaller particles, so that the water inlet is clear before the door.

In the prior art, utility model patent (100465381a) applied by sikawa hope dark blue electric power limited company discloses a power station penstock sand discharge construction system, consisting of main river channel check dam, diversion dike, right side dike, diversion channel, diversion gate, sand washing channel, sand washing gate, main river channel sand check weir, grit chamber, sand washing cover plate, sand guiding cover plate. The river channel is divided into a main river channel, a sand washing channel and a water diversion channel by the water diversion dike and the water diversion dike. An L-shaped grit chamber is arranged at one side of the upstream of the diversion gate and the sand washing gate, one end of the grit chamber starts the right river bank and is arranged in parallel with the direction of the diversion gate, the bottom of the grit chamber is gradually deepened towards the left end from the starting end of the right river bank, and a sand guiding cover plate is fixed on the upper surface of the grit chamber section arranged in parallel with the diversion gate at intervals; the left end of the sand settling tank is finished at the water diversion dike and the sand washing gate to form an L-shaped sand settling tank, the bottom of the L-shaped sand settling tank is deepened towards the sand washing gate in an inclined mode, and a sand washing cover plate is fixed on the upper face of the sand settling tank section leading to the sand washing gate. The system has clean and thorough sand discharge and realizes the automation of sand discharge.

And, the utility model patent (105019414B) of the national institute of electrical and civil exploration and design Limited discloses a narrow intake of water and electricity engineering of mountain area uses compound lock chamber structure, and this scheme is revised the sand washing lock chamber of arc structure into deep hole dull and stereotyped sand washing lock chamber system among the prior art, then directly is in the top of deep hole dull and stereotyped sand washing lock chamber system be provided with blowdown overflow weir to through one set of lock chamber system, the bottom realizes the sand discharge, and the dual function of blowdown is realized at the top, reaches the purpose that shows reduction construction cost. Meanwhile, as a large amount of excavation work is not needed, and the arc-shaped chamber system which is originally complex to manufacture, install and build the dam foundation is changed into a flat-plate chamber system which is simple to manufacture, install and build the dam on the chamber structure.

In addition, utility model patent (107842000A) of having applied for by the limited responsibility company of engineering survey design of Sichuan gold original discloses an automatic sand washing device, solve among the prior art problem that artifical sand washing cost is high difficult, it includes silt sand collecting tank and sand washing pipe, be provided with the sand setting plate in the silt sand collecting tank, sand setting plate one end is provided with the counter weight, silt sand collecting tank one side is provided with sand washing floodgate control tank, be provided with inlet opening and water intaking valve on the lateral wall that silt sand collecting tank and sand washing floodgate control tank are connected, be connected with water intaking valve control arm on the water intaking valve, water intaking valve control arm sets up along the sliding of inlet opening axis direction, sand washing floodgate control tank bottom rotation is provided with the valve control arm that drains, be provided with the float in the sand washing floodgate control tank, be provided with the sand washing floodgate on the sand washing pipe. The technical principle is that the automatic sand washing device is arranged at the downstream of a water taking facility beside a river channel or at a non-submerged place on a water taking device, silt is gradually deposited on a sand settling plate, the gravity of the silt to the sand settling plate is increased along with the increase of the amount of the deposited silt, when the gravity of the silt is increased to a certain degree, the sand settling plate rotates and drives a first rotating shaft to rotate, the first rotating shaft drives a water inlet valve control arm to slide under the action of a first connecting rod mechanism so that the water inlet valve is far away from a water inlet hole, at the moment, the water inlet valve control arm is separated from a slope mechanism so that a water discharge valve control arm drives a water discharge valve to move close to the water discharge hole and seal the water discharge hole under the self gravity action, water enters a sand washing gate control water tank from the water inlet hole to enable the water level inside to rise, a float rises along with the water, a sand washing gate is driven to move far away from a sand washing pipe through a second connecting rod mechanism, and water in the, the probability of blocking a downstream water distribution pipeline by silt is reduced.

The utility model patent (209025056U) applied by Chengdu institute of Electrical engineering research and design, Inc. of China also provides a combined structure of the float discharge gate and the sand washing gate, the middle part of the gate hole is provided with an overflow weir, the weir top overflow channel of the overflow weir is a float discharge channel, and the float discharge channel is provided with a float discharge gate; and a sand washing channel is arranged between the bottom of the overflow weir and the gate bottom plate and is provided with a sand washing gate. The overflow weir is of a concrete structure. The sluice gate is provided with a maintenance gate at one side of the upper reaches of the overflow weir. This scheme has shortened row's floating gate and sand washing floodgate total width through the structural style who combines row floating gate and sand washing floodgate in vertical direction and arrange, is favorable to the pivot to be arranged.

However, none of the above prior arts considers the following problems: in the river in the high mountain gorge area, the silt content is rich, a certain amount of large stones exist, the stones are easy to block in front of the sand washing gate and the water inlet, the inflow of the hydropower station is reduced, even the water inlet is completely blocked, the unit is frequently shut down and cannot be normally used, the power generation benefit and the service life of the hydropower station are reduced, and the stones impact and damage the structures such as the sand washing gate and the water inlet, so that the building safety is threatened. A plurality of practical engineering cases show that in the operation management work of the hydropower station hub, a large amount of manpower and material resources are consumed to clean the rock block accumulation, and the damaged sand washing gate, the water inlet and other buildings are maintained, so that the power generation benefit is greatly influenced. Therefore, for hydropower station engineering on a sandy river, the existing hub arrangement mode has defects and needs to be further improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to remedy prior art's not enough, provide a power station pivot arrangement mode and block stone sand device of leading that permeates water on many sand stone rivers.

The utility model discloses a realize like this:

a method for guiding water and sand through stone blocking and water permeation of a hydropower station hub on a multi-sand river flow is characterized in that a stone blocking and water and sand guiding wall is arranged between a sand washing gate and an overflow weir, block stones with larger particle sizes are blocked and guided on one side of the overflow weir and are discharged to downstream under the action of hydrodynamic force, water and silt penetrate through the stone blocking and water and sand guiding wall, the silt is discharged to the downstream through the sand washing gate, and water flow enters a water diversion power generation system through a water inlet, so that the stones, sand and water in the river flow are dredged and separated, and the stones, the sand and the water can go on the same way. The stone blocking, water permeable and sand guiding wall is arranged along the plane axis of the river in an arc, the starting point is connected with the front edge of the partition pier between the sand washing gate and the overflow weir, the end point is connected to the bank slope of the river channel, and a stone blocking protective barrier is formed for the water inlet and the sand washing gate.

The pivot arrangement mode is as follows: arranging a water inlet, a sand washing gate, an overflow weir or a water discharge building and a connecting dam section according to the river situation and the topographic and geological conditions, and arranging a stone blocking, water permeable and sand guiding wall between the sand washing gate and the overflow weir; the elevation of the weir top of the overflow weir (1) is level with the normal water storage level h1, the elevation of the sand washing gate orifice bottom is level with the original riverbed h2, the elevation of the water inlet bottom h3 is between the height of the weir top and the elevation of the normal water storage level, h2+ (0.2-0.4) × (h1-h2) is taken, and the height of the stone blocking, water permeable and sand guiding wall top is 0.5 m-1.0 m higher than the elevation of the weir top of the overflow weir.

The hydropower station hub stone blocking, water permeating and sand guiding device on the multi-sand river formed by the method comprises an overflow weir, a sand washing gate, a water inlet and a connecting dam section, wherein a stone blocking, water permeating and sand guiding wall is arranged between the sand washing gate and the overflow weir, the plane axis of the stone blocking, water permeating and sand guiding wall is arranged along the river in an arc line, the starting point is connected with the front edge of a partition pier between the sand washing gate and the overflow weir, and the end point is connected to the bank slope of the river; the wall body structure of the stone-blocking water-permeable sand-guiding wall comprises a wall body foundation and a wall body, wherein the wall body foundation is of a large-volume concrete structure, the wall body is of a high-strength impact-resistant wear-resistant reinforced concrete structure, a protective steel plate and an energy-absorbing rubber base plate are arranged on one side, close to an overflow weir, of the wall body, and a water-permeable sand inlet hole, a stone-blocking grid I and a stone-blocking grid II are arranged on the wall body; wherein, the water and sand permeable holes are round holes or rectangular holes and are arranged alternately according to the aperture size or are arranged in parallel in a plurality of columns; the first stone blocking grating is of a multi-lattice square frame structure, is arranged at the upper part of the wall body and is positioned above the water and sand inlet holes, and the second stone blocking grating is of a grid structure and is arranged with the water and sand inlet holes alternately in a longitudinal row or in the water and sand inlet holes; the lattice structures of the first stone blocking grating and the second stone blocking grating are formed by section steel.

As a preferable scheme, the lower orifice of the water-permeable sand inlet is smaller than the upper orifice, wherein the width of the rectangular orifice is 1-1.5 m, the height of the rectangular orifice is 0.8-1.2 m, and the diameter of the circular orifice is 0.1-0.3 m; the grid hole sizes of the first stone blocking grid and the second stone blocking grid are less than 0.1m multiplied by 0.1 m; the total area S of the water and sand permeable holes on the wall body, the first stone blocking grid and the second stone blocking grid is more than 2 times of the sum of the area S1 of the water inlet and the water passing area S2 of the sand washing gate, namely S is more than 2(S1+ S2).

As a preferable scheme, both sides of the wall foundation are designed to be inclined planes with the gradient of 1: 0.2-1: 0.75.

As a preferred scheme, the edge of the orifice of the water and sand permeable hole adopts an arc line, the hole body is a slope, and the gradient is 5% -10%.

As a preferred scheme, the facing steel plate is arranged on a wall surface layer, the facing steel plate is anchored in wall concrete by anchor bars and welded with wall steel bars, and an energy-absorbing rubber cushion plate is arranged between the facing steel plate and the concrete to absorb and reduce partial sandstone impact energy; the surface protection steel plate, the energy absorption rubber base plate and the wall surface are bonded by sealant.

As a preferable scheme, the gradient of a scouring funnel formed by the sand washing gate during sand washing and discharging is 1: 3-1: 7, and a water inlet of the power station is arranged in the range of the scouring funnel.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the functions of each building of the junction are fully exerted, and the safety and reliability of the operation of the junction are improved. The utility model discloses the pivot arrangement mode realizes separating the dredging of stone, sand, water in the river course rivers, makes stone, sand, water respectively do its own way. The stone blocking and water permeable sand guiding wall is of a high-strength concrete structure, the surface layer is provided with an energy-absorbing and anti-collision facility, the stone blocking and water permeable sand guiding wall has strong impact damage resistance, a protective barrier is formed in front of the sand flushing gate and the water inlet, the sand flushing gate and the water inlet are protected, large stones are prevented from directly impacting, and the safety and reliability of a pivot building and operation are improved.

(2) The influence of the sand and stone on the water inlet is reduced, the quality of power generation and water taking is ensured, and the power generation benefit is improved. Through the technical scheme, the situation that the power station cannot normally generate power due to the clogging of the water inlet can be greatly reduced. The machine is prevented from being shut down for frequently cleaning and maintaining the water inlet or overhauling the machine set, the number of hours for generating electricity is effectively guaranteed, and the generating benefit is improved.

(3) Through this technical scheme, reduce the maintenance degree of difficulty, reduce and shut down maintenance frequency, reduce managers working strength, do benefit to pivot operation management, reduce the maintenance cost.

Drawings

Fig. 1 is a general plane layout diagram of the hinge of the present invention;

FIG. 2 is an upstream elevation view of a hub arrangement;

FIG. 3 is a first vertical view of a stone-blocking, water-permeable and sand-guiding wall;

FIG. 4 is a second vertical view of the stone-blocking, water-permeable and sand-guiding wall;

FIG. 5 is a side view of a stone-blocking water-permeable sand-guiding wall;

FIG. 6 is a side view of a stone-blocking water-permeable sand-guiding wall II;

FIG. 7 is a partial macro-sample of a water and sand permeable hole;

FIG. 8 shows a top view of a clad steel sheet.

Fig. 9 is a schematic perspective view of the present invention.

Description of reference numerals: 1-overflow weir, 2-sand washing gate, 3-water inlet, 4-connecting dam section, 5-blocking stone water and sand permeable wall, 6-water and sand inlet hole, 7-wall foundation, 8-armor plate, 9-blocking stone grid I, 10-energy absorbing rubber backing plate, 11-anchor bar, 12-wall body and 13-blocking stone grid II.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses an implement like this:

as shown in fig. 1 and fig. 2, the pivot arrangement of the present invention is: according to the river situation and the topographic and geological conditions, a water inlet 3, a sand washing gate 2, an overflow weir 1 (or other water outlet gate holes, flood discharging holes and the like of water outlet buildings) and a connecting dam section 4 are arranged, and a stone blocking, water permeable and sand guiding wall 5 is arranged between the sand washing gate 2 and the overflow weir 1. The elevation of the weir top of the overflow weir 1 is flush with the normal water storage level (h1), the elevation of the orifice bottom of the sand washing gate 2 is flush with the original riverbed (h2), the elevation of the bottom of the water inlet 3 (h3) is between the elevation and the elevation of the orifice bottom of the original riverbed, h2+ (0.2-0.4) × (h1-h2), and the wall top of the stone blocking, water permeable and sand guiding wall 5 is 0.5 m-1.0 m higher than the elevation of the weir top of the overflow weir 1. The arrangement mode realizes dredging and separating of stone, sand and water in river water flow, so that the stone, the sand and the water can be separated. The utility model discloses a key facility establishes between sand washing floodgate 2 and overflow weir 1 and blocks the stone and permeate water and lead sand wall 5, blocks the piece stone of great particle diameter and leads in overflow weir 1 one side, excretes to low reaches under hydrodynamic force, and water and silt can pass this facility, and silt excretes to low reaches through sand washing floodgate 2, and rivers pass through water inlet 3 and get into diversion power generation system.

As can be seen from figure 1, the stone blocking, water permeable and sand guiding wall 5 is arranged between an overflow weir 1 and a sand washing gate 2, the plane axis is arranged along the river in an arc, the starting point is connected with the front edge of a partition pier between the sand washing gate and the overflow weir, the end point is connected to the bank slope of the river, the deflection angle alpha is 10-30 degrees, the turning section adopts a parabola or an arc line for smooth transition, and a protective barrier is formed between the sand washing gate 2 and a water inlet 3. Larger stones are guided to one side of the overflow weir 1 and discharged to the downstream under the action of hydrodynamic force.

As shown in fig. 3, 4, 5 and 6, the plane axis of the stone blocking, water permeable and sand guiding wall 5 is arranged along the river in an arc, the starting point is connected with the front edge of the partition pier between the sand washing gate 2 and the overflow weir 1, and the end point is connected with the bank slope of the river, so that a stone blocking protective barrier is formed for the water inlet 3 and the sand washing gate 2. The wall structure of the stone-blocking water-permeable sand-guiding wall 5 comprises a wall foundation 7, a wall body 12, water-permeable sand inlet holes 6, a first stone-blocking grid 9, a second stone-blocking grid 13, a facing steel plate 8 and an energy-absorbing rubber base plate 10. The wall foundation 7 is of a large-volume concrete structure, the wall body 12 is of a high-strength impact-resistant wear-resistant reinforced concrete structure, and in order to prevent damage caused by impact of rock blocks, a protective steel plate 8 and an energy-absorbing rubber base plate 10 are arranged on one side close to the overflow weir 1. The wall body 12 is provided with water and sand permeable holes 6 with alternate sizes, and a first stone blocking grid 9 and a second stone blocking grid 13 are arranged inside or around the water and sand permeable holes 6 and on the wall top.

Fig. 5 and fig. 6 show two kinds of schematic structural diagrams of the stone-blocking, water-permeable and sand-guiding wall 5, wherein the lower part of the wall body is a wall foundation 7 and adopts a common concrete structure, the upper wall body 12 adopts a high-strength, impact-resistant and wear-resistant reinforced concrete structure, the wall body 12 is provided with water-permeable and sand-feeding holes 6, and the surface layer of the wall body 12 is provided with a protective steel plate 8 and an energy-absorbing rubber base plate 10 to prevent the stone from being damaged by impact. As the large-particle-size bed ballast is basically positioned at the lower part of the riverbed, the lower part orifice of the water-permeable sand inlet hole 6 of the wall body 12 is preferably smaller so as to achieve the stone blocking effect, the upper part orifice is preferably larger so as to be convenient for water and sand permeation, the orifice of the rectangular hole (comprising two kinds of stone blocking grids) is 1-1.5 m wide, 0.8-1.2 m high and 0.1-0.3 m in diameter of the round hole. The permeable sand inlet holes 6 and the wall top are provided with a stone blocking grid for blocking floating stones, which is beneficial to water inlet, and the size of the grid holes is generally less than 0.1m multiplied by 0.1 m. Wherein the total area S of the water-permeable sand inlet holes 6 and the openings of the grid holes of the wall body 12 is more than 2 times of the sum of the area (S1) of the water inlet 3 and the water passing area (S2) of the sand washing gate 2, namely S is more than 2(S1+ S2). As shown in figures 3 and 4, both sides of the wall foundation 7 are designed to be inclined planes with the gradient of 1: 0.2-1: 0.75, so that the wall is favorable for stabilizing the wall and forming lateral force on sand to promote the sand to move towards the orifice of the sand washing gate 2. The detailed size of a specific orifice can be adjusted by combining the research result of the silt on a specific engineering river channel.

As shown in figures 7 and 8, the edges of the openings of the water and sand permeable holes 6 on the wall body 12 are preferably arc lines, so that the corners are prevented from being damaged by sand impact. The hole body is a slope, the gradient is 5% -10%, and the sandstone is favorably rolled off. The protective steel plate 8 is anchored in concrete of a wall body 12 by adopting anchor bars 11 and welded with the wall body steel bars, an energy-absorbing rubber base plate 10 is arranged between the protective steel plate 8 and the concrete to absorb and reduce part of sandstone impact energy and protect the concrete structure of the wall body 12, and the protective steel plate 8, the energy-absorbing rubber base plate 10 and the concrete wall surface are bonded by adopting sealant.

The elevation of each building of the junction is as follows: the height (h1) of the weir top of the overflow weir 1 is flush with the normal water storage level and is the highest, the height (h2) of the sand washing gate 2 hole bottom is the lowest, the height of the water inlet 3 is between the height of the overflow weir 1 and the height of the sand washing gate 2 hole bottom, h2+ (0.2-0.4) × (h1-h2) is taken, the height of the water permeable sand inlet 6(h3) of the wall body 12 hole bottom is lower than the height (h3) of the water inlet 3 and higher than the height (h2) of the sand washing gate 2. The slope of a washing funnel formed when the sand washing gate 2 washes and discharges sand is about 1: 3-1: 7, and the water inlet 3 of the power station needs to be arranged in the range of the washing funnel, so that the water inlet is guaranteed to be 'clear' before the door.

During specific implementation, the overall plane arrangement mode of the hub is determined according to the river and the topographic and geological conditions, and the axes of the stone blocking, water permeating and sand guiding walls 5 are reasonably arranged. The construction of the concrete structure of the junction building is a conventional method, when the stone blocking, water permeable and sand guide wall 5 is implemented, a foundation pit is firstly dug to form, concrete of a lower wall foundation 7 is poured, an upper wall body 12 is of a high-strength anti-impact wear-resistant reinforced concrete structure and is poured with the lower wall foundation 7 into a whole, anchor bars 11 of a pre-buried armor plate 8 are welded with structural steel bars of the wall body 12, and the armor plate 8 and an energy-absorbing rubber base plate 10 are installed after the structural concrete is constructed. When the permeable sand guide hole 6 of the wall body 12 is constructed, the hole body adopts a slope type body, the edge is a cambered surface, and an energy-absorbing rubber base plate 10 is adopted between the armor steel plate 8 and the concrete structure to absorb and reduce the impact energy of sand and stone. The armor steel plate 8, the energy-absorbing rubber backing plate 10 and the wall surface are bonded by sealant. The overall three-dimensional structure of the completed arrangement is shown in fig. 9.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (6)

1. The utility model provides a power station hub on many sand rivers blocks stone and leads sand device that permeates water, includes overflow weir (1), sand washing floodgate (2), water inlet (3) and connects dam segment (4), its characterized in that: a stone blocking, water permeable and sand guiding wall (5) is arranged between the sand washing gate (2) and the overflow weir (1), the plane axis of the stone blocking, water permeable and sand guiding wall (5) is arranged along the river in an arc, the starting point is connected with the front edge of the partition pier between the sand washing gate (2) and the overflow weir (1), and the end point is connected to the bank slope of the river channel; the wall structure of the stone-blocking water-permeable sand-guiding wall (5) comprises a wall foundation (7) and a wall body (12), wherein the wall foundation (7) is of a large-volume concrete structure, the wall body (12) is of a high-strength impact-resistant wear-resistant reinforced concrete structure, one side, close to an overflow weir (1), of the wall body (12) is provided with a armor steel plate (8) and an energy-absorbing rubber base plate (10), and the wall body (12) is provided with a water-permeable sand inlet hole (6), a stone-blocking grid I (9) and a stone-blocking grid II (13); wherein, the water and sand permeable holes (6) are round holes or rectangular holes and are arranged alternatively according to the aperture size or are arranged in parallel in a plurality of columns and columns; the first stone blocking grating (9) is of a multi-lattice square frame structure, is arranged on the upper portion of the wall body (12) and is positioned above the water and sand inlet holes (6), and the second stone blocking grating (13) is of a grid structure and is arranged with the water and sand inlet holes (6) alternately in a longitudinal row or in the water and sand inlet holes (6); the lattice structures of the first stone blocking grating (9) and the second stone blocking grating (13) are formed by section steel.

2. The hydropower station junction stone blocking, water permeable and sand guiding device on the sandy river flow according to claim 1, characterized in that: the lower orifice of the water-permeable sand inlet hole (6) is smaller than the upper orifice, wherein the width of the rectangular orifice is 1-1.5 m, the height of the rectangular orifice is 0.8-1.2 m, and the diameter of the circular orifice is 0.1-0.3 m; the grid hole sizes of the first stone blocking grid (9) and the second stone blocking grid (13) are less than 0.1m multiplied by 0.1 m; the total area S of the openings of the water and sand inlet holes (6), the first stone blocking grid (9) and the second stone blocking grid (13) on the wall body (12) is more than 2 times of the sum of the area S1 of the water inlet (3) and the water passing area S2 of the sand washing gate (2), namely S is more than 2(S1+ S2).

3. The hydropower station junction stone blocking, water permeable and sand guiding device on the sandy river flow according to claim 1, characterized in that: both sides of the wall foundation (7) are designed to be inclined planes with the gradient of 1: 0.2-1: 0.75.

4. The hydropower station junction stone blocking, water permeable and sand guiding device on the sandy river flow according to claim 1, characterized in that: the edge of the orifice of the water and sand permeable hole (6) adopts an arc line, the hole body is a slope, and the gradient is 5-10%.

5. The hydropower station junction stone blocking, water permeable and sand guiding device on the sandy river flow according to claim 1, characterized in that: the protective steel plate (8) is arranged on the surface layer of the wall body (12), the protective steel plate (8) is anchored in wall body concrete by adopting an anchor bar (11) and is welded with wall body steel bars, and an energy-absorbing rubber base plate (10) is arranged between the protective steel plate (8) and the concrete to absorb and reduce part of sandstone impact energy; the surface protection steel plate (8), the energy absorption rubber cushion plate (10) and the wall body (12) are bonded by sealant.

6. The hydropower station junction stone blocking, water permeable and sand guiding device on the sandy river flow according to claim 1, characterized in that: the slope of a washing funnel formed when the sand washing gate (2) washes and discharges sand is 1: 3-1: 7, and the water inlet (3) of the power station is arranged in the range of the washing funnel.

Images