CN114182698B - Continuous sand flushing type sand sedimentation tank structure and overhauling operation method thereof - Google Patents
Continuous sand flushing type sand sedimentation tank structure and overhauling operation method thereof Download PDFInfo
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- CN114182698B CN114182698B CN202111370728.XA CN202111370728A CN114182698B CN 114182698 B CN114182698 B CN 114182698B CN 202111370728 A CN202111370728 A CN 202111370728A CN 114182698 B CN114182698 B CN 114182698B
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/20—Movable barrages; Lock or dry-dock gates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- General Engineering & Computer Science (AREA)
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Abstract
The invention belongs to a continuous sand flushing type sand sedimentation tank structure and an overhaul operation method thereof in the field of sand sedimentation tanks of water conservancy and hydropower engineering, and the technical scheme is as follows: the downstream connecting section is connected with the downstream sand draining corridor system through a working gate section and a working section; the working gate section, the upstream connecting section and the working section are formed by two boxes in parallel; the sand flushing main gallery is communicated with the sand flushing branch gallery of the No. 1 pool carriage and the sand flushing branch gallery of the No. 2 pool carriage in a crossing manner; the working gate section and the downstream connecting section of the 1# pool carriage and the 2# pool carriage are respectively provided with a gate for controlling the flow direction of water; the sand washing branch gallery of the No. 1 pool carriage, the sand washing branch gallery of the No. 2 pool carriage and the sand washing main gallery are respectively provided with a gate for controlling the flow direction of sand. Through the sequence of opening and closing different gates, the purpose of normal operation of one compartment and the other compartment is realized. Realize sediment tank continuous drainage and produce electricity, under the power station normal operating condition, carry out periodic sand washing and maintenance to sediment tank cell to effectively improve sand washing efficiency.
Description
Technical Field
The invention relates to a sand sedimentation tank for water conservancy and hydropower engineering, in particular to a ground sand sedimentation tank structure combining continuous sand flushing and periodic sand flushing and a maintenance method thereof.
Background
In a river reach with a large amount of sediment, in order to prevent the sediment carried by water from entering a diversion system of a hydropower station, the sediment accumulation on a water channel and the abrasion on a water turbine are reduced, and a sediment tank is usually arranged behind a water intake and in front of a water delivery tunnel in a hydraulic and hydroelectric engineering.
The traditional sand sedimentation tank type can be divided into a periodic flushing type sand sedimentation tank and a continuous flushing type sand sedimentation tank according to a flushing mode. For a periodic flushing type sand sedimentation tank, the structure is simple, the operation is reliable, faults are not easy to occur, but the flow rate in the tank is uneven, the flushing work is frequent when the sand content of water flow is large, and the management is complex; the continuous flushing type sand sedimentation tank is characterized in that sand sedimentation, sand flushing and water supply can be simultaneously carried out, but the structure is complex, and the problem of pool chamber siltation of the sand sedimentation tank exists when the sand content of water flow is large.
Disclosure of Invention
In order to solve the technical problems, the invention provides a continuous sand-flushing type sand sedimentation tank structure and an overhaul operation method thereof, which can realize continuous water drainage of the sand sedimentation tank for power generation, regularly flushing and overhauling the tank chamber of the sand sedimentation tank under the normal running condition of a hydropower station, and effectively improve the sand flushing efficiency.
The technical proposal is as follows: a continuous sand flushing type sand sedimentation tank structure, which sequentially comprises a water inlet channel, a working gate section, an upstream connecting section, a working section, a downstream connecting section and a downstream sand discharge gallery system along the water flow direction; the working gate section, the upstream connecting section and the working section are formed by two boxes in parallel; the bottoms of the No. 1 pool carriage and the No. 2 pool carriage in the working section range are respectively provided with a No. 1 pool carriage sand washing support corridor and a No. 2 pool carriage sand washing support corridor; the sand flushing main gallery is communicated with the sand flushing branch gallery of the No. 1 pool carriage and the sand flushing branch gallery of the No. 2 pool carriage in a crossing manner; the sand washing branch gallery of the pool carriage No. 1 and the sand washing main gallery of the pool carriage No. 2 are parallelly penetrated through the downstream connecting section to form a downstream sand discharging gallery system; the downstream sediment removal corridor system discharges sediment to a downstream river; the side wall of the downstream connecting section is provided with a water inlet hole which is connected with the water delivery tunnel; the working gate section and the downstream connecting section of the 1# pool carriage and the 2# pool carriage are respectively provided with a gate for controlling the flow direction of water; the sand washing branch gallery of the No. 1 pool carriage, the sand washing branch gallery of the No. 2 pool carriage and the sand washing main gallery are respectively provided with a gate for controlling the flow direction of sand.
Based on the technical characteristics: the working gate section is provided with a working gate 1# and a working gate 2# respectively;
the 1# pool carriage and the 2# pool carriage are respectively provided with a 1# accident gate and a 2# accident gate on the upstream surface wall of the downstream connecting section;
a main gallery overhaul gate is arranged on the sand flushing main gallery, and the main gallery overhaul gate is positioned between the No. 1 pool box and the No. 2 pool box;
the sand washing branch corridor of the 1# pool carriage, the sand washing branch corridor of the 2# pool carriage and the sand washing main corridor are respectively provided with a sand washing branch corridor 1# working gate, a sand washing branch corridor 2# working gate and a sand washing main corridor working gate at the downstream side of the downstream connecting section.
Based on the technical characteristics: in the working gate section, a 1# working gate and a 2# working gate are also provided at downstream positions thereof, respectively.
Based on the technical characteristics: the 1# accident gate and the 2# accident gate are both bidirectional water retaining; the sand flushing main gallery overhaul gate, the sand flushing branch gallery 1# working gate, the sand flushing branch gallery 2# working gate and the sand flushing main gallery working gate are both bidirectional water retaining and sand discharging.
Based on the technical characteristics: setting a No. 1 pool box as Chi Shi to be overhauled, and setting a No. 2 pool box as a normal operation pool box; all gates are opened in initial states; the maintenance operation steps are as follows:
s1: closing a No. 1 working gate and a No. 1 accident gate, and discharging water in a No. 1 pool carriage into a downstream river channel through a No. 1 pool carriage sand flushing branch gallery;
s2: closing a working gate of a sand flushing branch gallery No. 2, and flushing the pond carriage No. 1 through a sand flushing main gallery by utilizing water in the pond carriage No. 2;
s3: closing a sand flushing main gallery overhaul gate, opening a No. 1 working gate, and flushing a No. 1 pool box by using upstream inflow water;
s4: closing a 1# working gate, after water in a 1# pool carriage is discharged through a 1# pool carriage sand flushing branch corridor and a downstream sand discharge corridor system, closing the 1# working gate of the sand flushing branch corridor, and opening a 2# working gate of the sand flushing branch corridor; overhauling No. 1 Chi Xiang;
s5: after the maintenance of the No. 1 pool carriage is completed, a No. 1 accident gate, a No. 1 working gate, a sand washing main gallery maintenance gate and a sand washing branch gallery No. 1 working gate are sequentially opened.
In the steps, through the sequence of opening and closing different gates, the purpose of normal operation of one compartment and the other compartment is realized, and the other compartment is normally overhauled.
As described above, the continuous sand flushing type sand sedimentation tank structure and the maintenance operation method thereof have the following beneficial effects: compared with the conventional sand sedimentation tank, the invention is added with a sand flushing main gallery overhaul gate, and the normal operation of one-compartment overhaul and one-compartment operation can be realized by controlling the opening of each gate. Compared with the conventional sand sedimentation tank, the sand sedimentation tank is more flexible to operate and wash sand, and the economic loss caused by shutdown maintenance can be reduced when the sand sedimentation tank fails.
Drawings
FIG. 1 is a schematic plan view of the structure of the sand sedimentation tank of the invention.
FIG. 2 isbase:Sub>A section A-A of FIG. 1.
Description of component reference numerals
1. Water inlet channel
2. Working gate section
3. Upstream connecting section
4. Working section
5. Downstream connecting section
6. Downstream sand removal corridor system
7. Water delivery tunnel
8. Sand flushing gallery
9 1# Chi Xiang
10 2# Chi Xiang
11 1# working gate
12 2# working gate
13 1# inspection gate
14 2# inspection gate
15. Sand flushing main corridor overhaul gate
16 1# accident gate
17 2# accident gate
18. Sand flushing support gallery 1# working gate
19. Sand flushing support gallery 2# working gate
20. Sand flushing main gallery working gate
21 Sand flushing support corridor for No. 1 pool carriage
22. Sand flushing main corridor
23 Sand flushing support corridor for No. 2 pool carriage
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the invention for which the invention may be practiced or for which the relative relationships may be altered or modified without materially altering the technical context.
As shown in fig. 1 and 2, a continuous sand-flushing type sand-settling pond structure is formed by concrete, and consists of two pond chambers, namely a No. 1 pond chamber 9 and a No. 2 pond chamber 10. The water inlet channel 1, the working gate section 2, the upstream connecting section 3, the working section 4, the downstream connecting section 5 and the downstream sand draining corridor system 6 are sequentially arranged along the water flow direction. The working gate section 2 is connected with the upstream water inlet channel 1; the upstream connecting section 3 is used for connecting the working gate section 2 and the working section 4; the bottom of the working section 4 is provided with a sand flushing gallery 8 which comprises a No. 1 pool carriage sand flushing branch gallery 21, a No. 2 pool carriage sand flushing branch gallery 23 and a sand flushing main gallery 22.
The working gate section 2, the upstream connecting section 3 and the working section 4 are all composed of two boxes in parallel. The water flow is split into two branches after passing through the water inlet channel 1, enters the 1# pool box 9 and the 2# Chi Xiang respectively, and then is collected in the downstream connecting section 5. The side wall of the downstream connecting section 5 is provided with a water inlet hole which is connected with the water delivery tunnel 7, and water flow after sand deposition provides hydroelectric power through the water delivery tunnel 7, so that the normal operation of the power station is ensured.
The bottoms of the No. 1 pool box 9 and the No. 2 pool box 10 in the range of the working section 4 are respectively provided with a No. 1 pool box sand flushing branch gallery 21 and a No. 2 pool box sand flushing branch gallery 23; the sand washing main gallery 22 is communicated with the 1# pool carriage sand washing branch gallery 21 and the 2# pool carriage sand washing branch gallery 23 in an intersecting manner; as shown in fig. 1, at the bottom of the working section 4, each sand wash branch gallery intersects vertically with the sand wash main gallery 22. The pool carriage sand washing branch gallery 21, the pool carriage sand washing branch gallery 23 and the sand washing main gallery 22 are arranged in parallel and pass through the downstream connecting section 5 to form a downstream sand discharging gallery system 6; the sediment removal corridor system 6 merges the sediment at the tail ends and discharges the sediment to a downstream river.
The # 1 tank 9 and the # 2 tank 10 are provided with gates in the working gate section 2 and the downstream connecting section 5 to control the flow direction of water. The method comprises the following steps: the working gate section 2 is internally provided with a working gate 11 # 1 in the pool carriage 9, and the upstream surface wall of the downstream connecting section 5 is provided with an accident gate 16 # 1; the 2# pool carriage 10 is provided with a 2# working gate 12 in the working gate section 2; a No. 2 accident gate 17 is arranged on the upstream surface wall of the downstream connecting section 5.
Within the working gate section 2, downstream of the working gate # 1 11 and working gate # 2 12 may be provided with a service gate # 1 13 and a service gate # 2 14, respectively.
The # 1 pool carriage sand washing branch gallery 21, the # 2 pool carriage sand washing branch gallery 23 and the sand washing main gallery 22 are respectively provided with a gate for controlling the flow direction of sand. The method comprises the following steps: the main gallery maintenance gate 15 is arranged on the sand washing main gallery 22, and the main gallery maintenance gate 15 is positioned between the No. 1 pool box 9 and the No. 2 pool box 10, and as shown in fig. 2, the main gallery maintenance gate 15 is arranged in the wall body between the pool boxes. The # 1 pool carriage sand washing branch gallery 21, the # 2 pool carriage sand washing branch gallery 23 and the sand washing main gallery 22 are respectively provided with a sand washing branch gallery # 1 working gate 18, a sand washing branch gallery # 2 working gate 19 and a sand washing main gallery working gate 20 at the downstream side of the downstream connecting section 5.
The No. 1 accident gate 16 and the No. 2 accident gate 17 are both bidirectional water retaining; the sand flushing main gallery overhaul gate 15, the sand flushing branch gallery 1# working gate 18, the sand flushing branch gallery 2# working gate 19 and the sand flushing main gallery working gate 20 are all bidirectional water retaining and sand discharging.
However, the 1# overhaul gate 13 and the 2# overhaul gate 14 can carry out unidirectional water blocking, and bidirectional water blocking is not needed; the bidirectional water retaining function is that backflow cannot occur, and water levels on the sides where backflow is high can be blocked through the gate.
Each of the service gates of the service gate section 2, the service gate of the main sand flushing gallery, the service gate 15 of the downstream connecting section 5, and the service gate of the sand flushing branch gallery and the service gate 20 of the main sand flushing gallery are all in a normally open state during continuous water supply and normal operation of the power station.
The invention provides a continuous sand flushing type sand sedimentation tank structure, which comprises the following steps of:
setting a No. 1 pool box 9 as Chi Shi to be overhauled, and setting a No. 2 pool box 10 as a normal operation pool box; all gates are opened in initial states; the maintenance operation steps are as follows:
s1: closing the No. 1 working gate 11 and the No. 1 accident gate 16, and discharging the water in the No. 1 pool box 9 into a downstream river channel through the No. 1 pool box sand flushing branch gallery 21;
s2: and closing the sand flushing branch gallery 2# working gate 19, and flushing the 1# pool carriage 9 by using the water body in the 2# pool carriage 10 through the sand flushing main gallery 22.
The purpose of this step is to flush the water in the pool box No. 2 10 into the pool box No. 19 through the main sand flushing gallery 22 by using the water head.
S3: the sand washing main corridor access gate 15 is closed, the # 1 working gate 11 is opened, and the # 1 tank 9 is washed by upstream inflow water.
S4: after the water body in the No. 1 working gate 11 and the No. 1 pool box 9 is discharged through the No. 1 pool box sand flushing branch corridor 21 and the downstream sand discharge corridor system 6, the sand flushing branch corridor 1 working gate 18 is closed, and the sand flushing branch corridor 2 working gate 19 is opened; and (5) overhauling the No. 1 pool box 9.
The purpose of doing so is in order to guarantee that the maintenance of the No. 1 pool box 9 can be realized, the No. 2 pool box 10 can work normally, and the loss caused by maintenance is reduced. The upper clean water in the No. 2 pool carriage 10 passes through the No. 2 accident gate 17 and then enters the water delivery tunnel 7 to generate electricity, and the lower water flow carries sediment and is discharged into a downstream river channel through the sand flushing support gallery No. 2 working gate 19.
S5: after the maintenance of the No. 1 pool carriage 9 is completed, the No. 1 accident gate 16, the No. 1 working gate 11, the sand washing main gallery maintenance gate 15 and the sand washing branch gallery No. 1 working gate 18 are sequentially opened.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (5)
1. A continuous sand flushing type sand sedimentation tank structure is characterized in that: the downstream direction is sequentially provided with a water inlet channel (1), a working gate section (2), an upstream connecting section (3), a working section (4), a downstream connecting section (5) and a downstream sand discharge corridor system (6); the working gate section (2), the upstream connecting section (3) and the working section (4) are formed by two boxes in parallel;
the bottoms of the No. 1 Chi Xiang (9) and the No. 2 Chi Xiang (10) within the range of the working section (4) are respectively provided with a No. 1 pool carriage sand washing branch corridor (21) and a No. 2 pool carriage sand washing branch corridor (23); the sand flushing main gallery (22) is communicated with the 1# pool carriage sand flushing branch gallery (21) and the 2# pool carriage sand flushing branch gallery (23) in an intersecting manner; the No. 1 pool carriage sand washing branch gallery (21), the No. 2 pool carriage sand washing branch gallery (23) and the sand washing main gallery (22) penetrate through the downstream connecting section (5) in parallel to form the downstream sand discharging gallery system (6); the downstream sediment removal corridor system (6) is used for removing sediment to a downstream river; the side wall of the downstream connecting section (5) is provided with a water inlet hole which is connected with the water delivery tunnel (7); a sand washing main gallery overhaul gate (15) is arranged on the sand washing main gallery (22), and the sand washing main gallery overhaul gate (15) is positioned between the 1# Chi Xiang (9) and the 2# Chi Xiang (10);
the gate control water flow direction is arranged on the working gate section (2) and the downstream connecting section (5) respectively by the 1# Chi Xiang (9) and the 2# Chi Xiang (10); the No. 1 pool carriage sand washing branch gallery (21), the No. 2 pool carriage sand washing branch gallery (23) and the sand washing main gallery (22) are respectively provided with a gate for controlling the flow direction of sand; the No. 1 Chi Xiang (9) and the No. 2 Chi Xiang (10) are respectively provided with a No. 1 accident gate (16) and a No. 2 accident gate (17) on the upstream surface wall of the downstream connecting section (5).
2. A continuous sand-flushing type sand-settling tank structure as claimed in claim 1, characterized in that:
the 1# Chi Xiang (9) and the 2# Chi Xiang (10) are respectively provided with a 1# working gate (11) and a 2# working gate (12) in the working gate section (2);
the sand washing branch corridor (21) of the No. 1 pool carriage, the sand washing branch corridor (23) of the No. 2 pool carriage and the sand washing main corridor (22) are respectively provided with a sand washing branch corridor No. 1 working gate (18), a sand washing branch corridor No. 2 working gate (19) and a sand washing main corridor working gate (20) at the downstream side of the downstream connecting section (5).
3. A continuous sand-flushing type sand-settling tank structure as claimed in claim 2, characterized in that: in the working gate section (2), a 1# working gate (11) and a 2# working gate (12) are further provided with a 1# overhauling gate (13) and a 2# overhauling gate (14) at downstream positions respectively.
4. A continuous sand-flushing type sand-settling tank structure as claimed in claim 2, characterized in that: the No. 1 accident gate (16) and the No. 2 accident gate (17) are both bidirectional water retaining; the sand flushing main gallery overhaul gate (15), the sand flushing branch gallery No. 1 working gate (18), the sand flushing branch gallery No. 2 working gate (19) and the sand flushing main gallery working gate (20) are bidirectional water retaining and sand discharging.
5. The maintenance operation method of the continuous sand flushing type sand sedimentation tank structure according to claim 2, wherein the maintenance operation method is characterized in that: setting the 1# Chi Xiang (9) as Chi Shi to be overhauled and the 2# Chi Xiang (10) as a normal operation pool chamber; all gates are opened in initial states; the maintenance operation steps are as follows:
s1: closing the No. 1 working gate (11) and the No. 1 accident gate (16), wherein water in the No. 1 Chi Xiang (9) is discharged into the downstream river through the No. 1 pool box sand flushing branch gallery (21);
s2: closing the sand flushing branch gallery 2# working gate (19), and flushing the 1# Chi Xiang (9) through the sand flushing main gallery (22) by utilizing the water body in the 2# Chi Xiang (10);
s3: closing the sand flushing main gallery overhaul gate (15), opening the No. 1 working gate (11), and flushing the No. 1 Chi Xiang (9) by using upstream inflow water;
s4: closing the 1# working gate (11), wherein after water in the 1# Chi Xiang (9) is discharged through the 1# pool carriage sand flushing branch gallery (21) and the downstream sand discharging gallery system (6), closing the sand flushing branch gallery 1# working gate (18), and opening the sand flushing branch gallery 2# working gate (19); performing the overhaul of 1# Chi Xiang (9);
s5: after the overhaul of the No. 1 Chi Xiang (9) is completed, the No. 1 accident gate (16), the No. 1 working gate (11), the sand washing main gallery overhaul gate (15) and the sand washing branch gallery No. 1 working gate (18) are sequentially opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111370728.XA CN114182698B (en) | 2021-11-18 | 2021-11-18 | Continuous sand flushing type sand sedimentation tank structure and overhauling operation method thereof |
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| CN202111370728.XA CN114182698B (en) | 2021-11-18 | 2021-11-18 | Continuous sand flushing type sand sedimentation tank structure and overhauling operation method thereof |
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| CN114182698B true CN114182698B (en) | 2023-04-25 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1645356A1 (en) * | 1989-03-24 | 1991-04-30 | Азербайджанский Инженерно-Строительный Институт | Lake settler |
| JP4030389B2 (en) * | 2002-08-29 | 2008-01-09 | 株式会社小島組 | Dredging system and dredging method for large capacity reservoir |
| CN206736872U (en) * | 2017-05-23 | 2017-12-12 | 中国电建集团成都勘测设计研究院有限公司 | Large hydropower station water inlet scour gallery |
| CN210186599U (en) * | 2019-03-15 | 2020-03-27 | 昆明理工大学 | Flushing type sand basin |
| CN209837269U (en) * | 2019-03-28 | 2019-12-24 | 环能科技股份有限公司 | Multifunctional rainwater intercepting and storing system |
| CN110339603B (en) * | 2019-08-13 | 2024-06-14 | 中国电建集团北京勘测设计研究院有限公司 | Regular flushing type sand sedimentation tank with increased overflow capacity |
| CN110409389A (en) * | 2019-08-13 | 2019-11-05 | 中国电建集团北京勘测设计研究院有限公司 | A kind of simultaneous collection sand flushing system of multichannel water intaking |
| CN112691444A (en) * | 2020-12-18 | 2021-04-23 | 安徽省水利水电勘测设计研究总院有限公司 | Vertical filtration overflow water intaking type desilting basin in turn |
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