CN109113033B - Submerged floating type sediment trapping bank with built-in drainage pump for preventing sediment from entering water intake - Google Patents
Submerged floating type sediment trapping bank with built-in drainage pump for preventing sediment from entering water intake Download PDFInfo
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- CN109113033B CN109113033B CN201810973033.2A CN201810973033A CN109113033B CN 109113033 B CN109113033 B CN 109113033B CN 201810973033 A CN201810973033 A CN 201810973033A CN 109113033 B CN109113033 B CN 109113033B
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- submerged
- sand blocking
- buoyancy tank
- sediment
- floating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
- E02B8/023—Arresting devices for waterborne materials
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Structures Of Non-Positive Displacement Pumps (AREA)
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Abstract
The invention discloses a submerged floating sand blocking bank with a built-in drainage pump for preventing excessive sediment from entering a water intake, which comprises a fixedly arranged enclosed cavity type fixed sand blocking bank, a submerged buoyancy tank positioned in the enclosed cavity of the fixed sand blocking bank, a drainage pump arranged in the submerged buoyancy tank, an elevation sensor for monitoring sediment deposition height and a central control unit; the body structure of the submerged buoyancy tank is matched with the body structure of the fixed sand blocking bank surrounding cavity, a guide structural part and a limiting structural part for limiting the floating distance of the submerged buoyancy tank are arranged between the submerged buoyancy tank and the fixed sand blocking bank surrounding cavity, and the submerged buoyancy tank is provided with a vent pipe (1). According to the submerged floating type sand blocking bank, when sediment deposition in front of the sand blocking bank is higher than a limit elevation, the submerged floating box floats upwards to increase the elevation of the sand blocking bank, and after a temporary sand prevention task is completed, the submerged floating box submerges into a surrounding cavity of the fixed sand blocking bank to recover the normal state of sand blocking. The invention enables the submerged floating box to float and sink by changing the water level in the submerged floating box, realizes the height increase and reduction of the sand blocking ridge, and has simple operation and strong feasibility.
Description
Technical Field
The invention relates to hydraulic engineering, disaster prevention and reduction engineering, agricultural hydraulic engineering and the like, in particular to a sand blocking bank of a mountain river intake, which has large sediment accumulation before the intake and needs to temporarily improve the height of the sand blocking bank.
Background
The mode of getting water from mountain rivers is that except getting water at the deep layer in high dam reservoir, more water getting modes are low gate water getting or dam-free water getting, and the water taking port is arranged to the side direction and is main. In order to prevent the sediment in the river channel from entering the water intake, it is very important to reasonably set the position and the body type of the water intake, and in addition, a sand blocking and sand discharging building is also needed to be arranged at a proper position in front of the inlet of the water intake, wherein the sand blocking building mainly comprises a sand blocking ridge.
For a river intake in a mountain area, the silt flux in front of the intake in a flood season may exceed an engineering design estimated value, so that excessive silt falls into silt in front of a silt blocking bank of the intake, and the silt deposition may be higher than a silt deposition limit elevation. For the water intake of a partial riverbed type hydropower station, in the period of water diversion and power generation, a large amount of silt can be deposited in front of the sand blocking bank and in a reservoir area, when the water level is reduced in the flood season and the sand is discharged, the deposited silt can be started or suspended in a large amount, and part of the silt can possibly cross the sand blocking bank and enter the water intake. The occurrence of the above situation can affect the safe operation of the water intake, and the current countermeasures mainly adopt manual dredging as a main measure, and no effective engineering measures exist.
In order to prevent excessive silt from entering a water intake and considering the convenience of operation, the invention develops the submerged floating type sand blocking sill with the built-in drainage pump, and until the invention is completed, the inventor does not find relevant research and engineering examples of the sand blocking sill provided by the invention.
Disclosure of Invention
Aiming at the requirement of sand blocking at a water intake of a mountain river, the invention provides a submerged sand blocking bank with a built-in drainage pump for preventing sand from entering the water intake, which is used for blocking excessive silted or suspended sand in front of the sand blocking bank of the water intake from entering the water intake in a flood season so as to achieve the purposes of safely blocking sand, reducing maintenance cost and improving engineering operation safety.
The invention has the basic idea that the sand blocking bank is designed into a sand blocking bank with changeable elevation, the elevation of the sand blocking bank is increased in a flood season, and the elevation of the sand blocking bank is restored to the designed elevation in a water intake season, so that the problem that excessive silting or suspended sediment in front of the sand blocking bank enters a water intake in the flood season is solved.
The invention is basically designed in such a way that the sand blocking bank is designed to be composed of a fixed sand blocking bank with a fixed elevation and a submerged box capable of submerging and floating in water, the height of the sand blocking bank is changed by injecting or discharging water into or out of the submerged box to submerge or float the submerged box, and the problem that excessive silting or suspended sediment in front of the sand blocking bank enters a water intake in flood season is solved.
The invention provides a submerged floating sediment trap of a built-in drainage pump for preventing sediment from entering a water intake, which comprises the following components: a fixed sand blocking bank which is fixedly arranged on a bottom plate in front of a water intake and is in a surrounding cavity type, a submerged buoyancy tank which is positioned in the surrounding cavity of the fixed sand blocking bank, a drainage pump which is arranged in the submerged buoyancy tank, an elevation sensor which is arranged in front of the fixed sand blocking bank and used for monitoring the sediment deposition height, and a central control unit which is electrically connected with the elevation sensor and the drainage pump, wherein the body structure of the submerged buoyancy tank is matched with the body structure of the surrounding cavity of the fixed sand blocking bank, and a gap is left between the submerged floating box and the fixed sand blocking bank enclosure cavity so that water enters the gap to float the submerged floating box with drained water, a guide structural member for limiting the swing of the submerged floating box in the up-and-down floating process and a limit structural member for limiting the floating distance of the submerged floating box are arranged between the submerged floating box and the surrounding cavity of the fixed sand blocking bank, the submerged buoyancy tank is provided with a vent pipe, the upper end section of the submerged buoyancy tank is provided with a vent hole, and the vent hole of the vent pipe is positioned above the water surface and communicated with the atmosphere when the submerged buoyancy tank floats to the limiting position in the flood season.
In order to achieve better technical effects, the invention can further adopt the following technical measures, and the following technical measures can be implemented independently, also can be implemented in a combination mode, or even can be implemented together.
In the technical scheme of the invention, the supporting piers for supporting the submerged buoyancy tanks are fixedly arranged on the bottom plate of the enclosure cavity of the fixed sand blocking bank in priority; furthermore, the support piers preferably adopt two support piers which are arranged in parallel and have a strip-shaped structure.
In the technical scheme of the invention, the design of a supporting pier for supporting and supporting the fixed sand blocking ridge on the back flow surface of the fixed sand blocking ridge is considered preferentially; furthermore, the supporting piers and the fixed sand blocking ridge are designed to be of an integral structure, and the supporting piers are preferably of a structure with narrow upper parts and wide lower parts.
In the technical scheme of the invention, the enclosure cavity for fixing the sand blocking ridge is designed into the enclosure cavity with a rectangular structure, and the four directions of the enclosure cavity are respectively provided with a guide structural member and a limiting structural member for limiting the swinging of the submerged floating box in the up-and-down floating process; furthermore, two pairs of guide structural members are arranged in four directions of the enclosure cavity, two pairs of limit structural members are arranged in the long edge direction of the enclosure cavity, and one pair of limit structural members are arranged in the short edge direction of the enclosure cavity; the guiding structural member for limiting the swing of the submerged box in the up-and-down floating process preferably adopts I-shaped steel fixedly arranged on the inner wall surface of the enclosure cavity of the fixed sand blocking bank, and the I-shaped steel is partially embedded into the inner wall surface of the enclosure cavity of the sand blocking bank.
In the technical scheme of the invention, the limiting structural part can be composed of a first limiting clamp fixedly arranged at the upper part of the inner wall surface of the fixed sand blocking bank enclosure cavity and a second limiting clamp fixedly arranged at the lower part of the outer wall surface of the submerged floating box. The limiting structure can be in other various structural forms, such as a guide limiting rod assembly combining the limiting structure and the guide structure. When the limiting structural part is formed by the first limiting clamp and the second limiting clamp, the first limiting clamp is arranged at the upper part of the inner wall surface of the fixed sand blocking bank enclosure cavity.
In the technical scheme of the invention, the height of the submerged buoyancy tank is preferably designed to be flush with the top of the fixed sand blocking ridge when the submerged buoyancy tank is submerged in the surrounding cavity of the fixed sand blocking ridge.
The submerged floating sand blocking bank with the built-in drainage pump for preventing the silt from entering the water intake provided by the invention has the basic operation principle that the relative value of the gravity and the buoyancy of the submerged floating box body is changed by drainage of the drainage pump or irrigation of the air vent, so that the submerged floating box is floated out or submerged into the surrounding cavity of the fixed sand blocking bank, and the purpose of temporarily increasing the elevation of the sand blocking bank is realized by floating the submerged floating box. The actual operation of the submerged sand blocking bank consists of two processes of floating and submerging.
In the initial state of the submerged sand blocking bank, the vent pipe and the submerged box filled with water are completely arranged under water, and the submerged box is submerged in the enclosed cavity of the fixed sand blocking bank and supported on the support pier at the bottom of the enclosed cavity; in a flood season or during sand discharge operation, if the sand surface elevation sensor monitors that the sediment accumulation elevation in front of the sand blocking bank is higher than the design limit elevation, after the water level is lowered and the sand discharge operation is carried out, the sediment in front of the sand blocking bank still continuously accumulates or partially overflows, and the elevation of the sand blocking bank is increased.
The submerged floating sand blocking bank runs upwards. The water level before the water intake is reduced to the prerequisite that the vent hole of the vent pipe is communicated with the atmosphere, then the control unit is adopted to control the drainage pump to gradually drain the water in the submerged buoyancy tank, and when the buoyancy force borne by the submerged buoyancy tank is larger than the total gravity of the tank body and the water body in the tank (namely F & gtG), the submerged buoyancy tank gradually floats upwards under the guidance of the guide structural member until the limit card on the submerged buoyancy tank contacts and fixes the limit card. The maximum floating height is the height difference of the two limit cards. The buoyancy and gravity calculation in the water drainage process can be calculated by formulas shown in formulas (1) to (8), and the control condition of the floating process is F & gtG. In addition, it should be emphasized that, in order to embody the floating timeliness of the submerged floating box, the invention takes the time t of completely removing the water in the submerged floating box as one of the control conditions, and the time is recommended to be 10-15 min, preferably 10min, so that the number of the drainage pumps which need to be arranged in the submerged floating box can be obtained. The drain pump is suggested to be evenly and symmetrically distributed.
And (5) submerging the submerged sand blocking bank. The initial state of the submerged sand blocking bank is the final state of the floating process of the submerged sand blocking bank. When the sand washing operation at a low water level is finished or the sand pulling operation of the reservoir is finished in a flood season, the water level in front of the water intake is gradually increased and is restored to a normal water storage level, after the water level is higher than the vent holes preset on the vent pipes, water flow enters the diving and floating box from the vent holes along the vent pipes to increase the gravity of the diving and floating box, so that the diving and floating box gradually dives, after the vent pipes are completely submerged in the water level, the speed of the water flow entering the diving and floating box body is relatively accelerated, the sinking speed of the diving and floating box is accelerated, and finally the diving and floating box body is supported on the support piers at the bottom of the enclosure cavity and is. The calculation of buoyancy and gravity in the submergence process can be shown by formulas (1) to (8), and the basic control condition is F < G. It should be noted that the time of the submergence process does not need to be determined accurately, and only the water level is ensured to rise and then water can enter the interior of the buoyancy tank from the air vent.
The invention mainly has the following advantages:
(1) according to the invention, the sand blocking elevation of the sand blocking ridge in front of the water intake is increased by controlling the rising of the submerged floating box, so that the temporary sand blocking effect is achieved.
(2) The floating and sinking of the submerged buoyancy tank can be realized only through the operations of water level adjustment in front of the water intake, drainage of the drainage pump, water inlet of the air vent and the like, so that the problem of temporary sand blocking in the flood season is solved, and the submerged buoyancy tank has the advantages of simplicity in operation, strong feasibility, wide application range and the like.
The engineering design of the invention relates to the following calculation formulas:
F＝ρgVap(1)
Ga＝ρagVa(2)
Va＝Sada(3)
Gb＝ρbgSbdb(4)
Gc＝mcg (5)
Gd＝ρgVd(6)
Ge＝ρegVe(7)
G＝Ga+Gb+Gc+Gd+Ge(8)
the meaning of each parameter in the above formula is as follows:
f is the buoyancy force on the submerged floating box, N;
rho-density of water, kg/m3；
g-acceleration of gravity, 9.8m/s2；
Vap-volume of water discharged from the submerged tank, m3；
Ga-the weight of the inner box, N;
ρasteel plate Density, kg/m3；
VaTotal volume of the submerged buoyancy tank casing, m3；
SaExternal surface area of the submerged buoyancy tank shell, m2；
da-thickness of the buoyancy tank shell, m;
Gb-snorkel weight, N;
ρb-material density of the ventilation pipe, kg/m3；
Sb-external surface area of the vent pipe, m2；
db-thickness of the vent pipe, m;
Gc-water pump gravity, N;
mc-mass of water pump, kg;
Gd-the weight of the remaining water in the submerged buoyancy tank, N;
Vdvolume of water remaining in the submerged buoyancy tank, m3；
Ge-lower stop member weight, N;
Velower limit member volume, m3；
ρeMaterial density of lower limit stop, kg/m3；
G is the total weight of the submerged buoyancy tank, N;
drawings
Figure 1 is a general schematic view of a water intake arrangement provided with the present invention.
Fig. 2-1 is a schematic structural view of a submerged floating box in the sand trap bank of the present invention in a submerged state.
Fig. 2-2 is a schematic structural view of the submerged box in the sand trap in a floating state.
FIG. 3 is a schematic view of the cross-sectional view along the line I-I in FIG. 2-1.
FIG. 4 is a schematic view of the sectional structure along the direction II-II in FIG. 3.
Fig. 5 is an enlarged structural diagram of a part B in fig. 1.
Fig. 6 is an enlarged schematic view of a portion C in fig. 2-2.
In the above drawings, the identification objects of the respective drawing reference numerals are: 1-a breather pipe; 2-a vent; 3-submerging a buoyancy tank; 4-fixing the sand blocking ridge; 5-an elevation sensor; 6-a central control unit; 7-draining pump; 8-upstream retaining wall of water intake; 9-a hoist; 10-water intake; 11-water intake control gate; 12-i-steel; 13-a first limit card; 14-a second limit card; 15-supporting a supporting pier; 16-support pier.
Detailed Description
The following provides a specific embodiment of the invention with reference to the accompanying drawings, and further describes the built-in drainage pump submerged floating sand trap for preventing silt from entering a water intake according to the specific embodiment. It should be particularly noted that the embodiments of the present invention are not limited to the forms described in the examples.
In the following detailed description, directional terms are used, such as: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
The built-in drainage pump submerged-floating sediment trap for preventing sediment from entering a water intake of the embodiment is structurally shown in the attached drawings 1-6, and comprises a surrounding cavity type fixed sediment trap 4 fixedly arranged on a bottom plate in front of the water intake 10, a submerged box 3 positioned in the surrounding cavity of the fixed sediment trap, a drainage pump 7 arranged in the submerged box, an elevation sensor 5 arranged in front of the fixed sediment trap for monitoring sediment deposition height, and a central control unit 6 electrically connected with the elevation sensor and the drainage pump, wherein two strip-shaped support piers 16 which are arranged in parallel and used for supporting the submerged box are fixedly arranged on the bottom plate in the rectangular surrounding cavity of the fixed sediment trap; the body structure of the submerged floating box is matched with the body structure of the fixed sand blocking bank enclosure cavity, a gap which is large enough is reserved between the submerged floating box and the fixed sand blocking bank enclosure cavity so that water can enter the gap to float the submerged floating box after drainage, two I-shaped steels 12 serving as guide structural members are vertically arranged in each direction between the submerged floating box and the fixed sand blocking bank enclosure cavity, two pairs of limiting structural members are arranged in a long edge direction, namely the width direction of the sand blocking bank, and a pair of limiting structural members are arranged in a short edge direction, namely the thickness direction of the sand blocking bank, and each limiting structural member consists of a first limiting clamp 13 fixedly arranged at the upper part of the inner wall surface of the fixed sand blocking bank enclosure cavity and a second limiting clamp 14 fixedly arranged at the lower part of the outer wall surface of the submerged floating box; a vent pipe 1 is arranged on the submerged buoyancy tank, a vent hole 2 is designed at the upper end section of the vent pipe, and the position of the vent hole 2 is located above the water surface when the submerged buoyancy tank floats to a limiting position in a flood season. The air vent 2 is also a water inlet for water to enter the submerged floating box; and a supporting pier 15 for supporting and supporting the fixed sand blocking ridge is designed on the back flow surface of the fixed sand blocking ridge, the supporting pier and the fixed sand blocking ridge are of an integral structure, and the supporting pier is of a structure with a narrow upper part and a wide lower part and a slope surface.
Claims (9)
1. The utility model provides a prevent that silt from getting into built-in drain pump of intake dives floating sediment trapping bank which characterized in that: comprises a surrounding cavity type fixed sand blocking bank (4) fixedly arranged on a bottom plate in front of a water intake, a submerged buoyancy tank (3) positioned in the surrounding cavity of the fixed sand blocking bank, a drainage pump (7) arranged in the submerged buoyancy tank, an elevation sensor (5) arranged in front of the fixed sand blocking bank and used for monitoring the sediment deposition height, and a central control unit (6) electrically connected with the elevation sensor and the drainage pump, wherein the body structure of the submerged buoyancy tank is matched with the body structure of the surrounding cavity of the fixed sand blocking bank, a gap is reserved between the submerged buoyancy tank and the surrounding cavity of the fixed sand blocking bank so that water enters the gap and can float the submerged buoyancy tank after drainage, a guide structural member for limiting the swinging of the submerged buoyancy tank in the up-down floating process and a limiting structural member for limiting the floating distance of the submerged buoyancy tank are arranged between the submerged buoyancy tank and the surrounding cavity of the fixed sand blocking bank, the submerged buoyancy tank is provided with a vent pipe (1) with a vent, the vent (2) is positioned above the water surface and communicated with the atmosphere when the submerged floating box floats to the limiting position in the flood season.
2. The submerged floating sediment trap of the built-in drainage pump for preventing sediment from entering the water intake according to claim 1, characterized in that: and a supporting pier (16) for supporting the submerged buoyancy tank is fixedly arranged on the bottom plate of the enclosure cavity of the fixed sand blocking bank.
3. The submerged floating sediment trap of the internal drainage pump for preventing sediment from entering the water intake according to claim 2, characterized in that: the support piers are two support piers which are arranged in parallel and have a strip-shaped structure.
4. The submerged floating sediment trap of the built-in drainage pump for preventing sediment from entering the water intake according to claim 1, characterized in that: and a supporting pier (15) for supporting and supporting the fixed sand blocking ridge is designed on the back flow surface of the fixed sand blocking ridge.
5. The submerged floating sediment trap of the built-in drainage pump for preventing sediment from entering the water intake according to claim 4, characterized in that: the supporting pier and the fixed sand blocking ridge are of an integral structure, and the supporting pier is of a structure with a narrow upper part and a wide lower part and a slope surface.
6. The submerged floating sediment trap of the built-in drainage pump for preventing sediment from entering a water intake according to any one of claims 1 to 5, characterized in that: the enclosing cavity of the fixed sand blocking ridge is of a rectangular structure, and guide structural members and limiting structural members for limiting the submerged floating box to swing up and down in the floating process are arranged in four directions of the enclosing cavity.
7. The submerged floating sediment trap of the internal drainage pump for preventing sediment from entering the water intake according to claim 6, characterized in that: two pairs of guide structural members are arranged in four directions of the surrounding cavity, two pairs of limit structural members are arranged in the long edge direction of the surrounding cavity, and a pair of limit structural members are arranged in the short edge direction of the surrounding cavity.
8. The submerged floating sediment trap of the internal drainage pump for preventing sediment from entering the water intake according to claim 7, characterized in that: the guiding structural member for limiting the swing of the submerged floating box in the up-and-down floating process is an I-shaped steel (12) fixedly arranged on the inner wall surface of the enclosure cavity of the fixed sand blocking bank.
9. The submerged floating sediment trap of the internal drainage pump for preventing sediment from entering the water intake according to claim 6, characterized in that: the limiting structural part is composed of a first limiting clamp (13) fixedly arranged on the upper portion of the inner wall surface of the fixed sand blocking bank enclosing cavity and a second limiting clamp (14) fixedly arranged on the lower portion of the outer wall surface of the submerged floating box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810973033.2A CN109113033B (en) | 2018-08-24 | 2018-08-24 | Submerged floating type sediment trapping bank with built-in drainage pump for preventing sediment from entering water intake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810973033.2A CN109113033B (en) | 2018-08-24 | 2018-08-24 | Submerged floating type sediment trapping bank with built-in drainage pump for preventing sediment from entering water intake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109113033A CN109113033A (en) | 2019-01-01 |
| CN109113033B true CN109113033B (en) | 2020-04-28 |
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| CN201810973033.2A Expired - Fee Related CN109113033B (en) | 2018-08-24 | 2018-08-24 | Submerged floating type sediment trapping bank with built-in drainage pump for preventing sediment from entering water intake |
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| CN113389178B (en) * | 2021-06-16 | 2023-12-05 | 清华大学 | Intelligent lifting stop log silt control device and silt control method using same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1060871A (en) * | 1996-08-21 | 1998-03-03 | Koken Boring Mach Co Ltd | Method of dam renewal |
| CN104863097A (en) * | 2014-02-20 | 2015-08-26 | 天津大学 | Flexible sand stop curtain structure |
| CN104631396B (en) * | 2015-03-03 | 2016-08-17 | 山东农业大学 | Laminated water gate |
| CN106087899B (en) * | 2016-08-10 | 2018-02-27 | 河南省水利勘测设计研究有限公司 | Aperture width can adjust float type maintenance steel-slag sand |
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Inventor after: Ma Xudong Inventor after: Nie Ruihua Inventor after: Liu Xingnian Inventor after: Huang Er Inventor after: Yang Kejun Inventor after: Zhang Bin Inventor after: Wang Xiekang Inventor after: Zhong Yihua Inventor before: Ma Xudong Inventor before: Zhong Yihua Inventor before: Nie Ruihua Inventor before: Liu Xingnian Inventor before: Huang Er Inventor before: Yang Kejun Inventor before: Zhang Bin Inventor before: Wang Xiekang |
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Granted publication date: 20200428 Termination date: 20210824 |