CN112796368A - Method for repairing large-diameter water intake head top cover - Google Patents
Method for repairing large-diameter water intake head top cover Download PDFInfo
- Publication number
- CN112796368A CN112796368A CN202011625025.2A CN202011625025A CN112796368A CN 112796368 A CN112796368 A CN 112796368A CN 202011625025 A CN202011625025 A CN 202011625025A CN 112796368 A CN112796368 A CN 112796368A
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- water intake
- steel frame
- steel
- intake head
- repairing
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/02—Making or lining canals
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/08—Details, e.g. gates, screens
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Revetment (AREA)
Abstract
The invention discloses a method for repairing a top cover of a large-diameter water intake head. The process is as follows: prefabricating an outer-wrapped steel frame and a water inlet steel grating; pouring concrete at the original foundation position of the underwater water intake head to form a new lower foundation of the top cover, and embedding connecting bolts in the lower foundation; transporting the prefabricated steel frame to the upper part of the lower foundation in a hoisting mode, and connecting the steel frame with the lower foundation through pre-embedded connecting bolts; after the steel frame is installed, pouring the frame part below the water inlet window on the steel frame in an underwater concrete pouring mode to enable the steel frame and the lower foundation to form a whole; and (4) mounting the prefabricated steel grating on the top of the steel frame to finish the repair of the water intake head cover. The invention can be suitable for repairing the water intake head cover under various conditions, including fresh water and seawater conditions, and can also be suitable for water intake heads with various shapes, can meet the service life after repair, and has relatively low construction cost and faster construction speed.
Description
Technical Field
The invention belongs to the technical field of hydraulic structure repair, and particularly relates to a method for repairing a top cover of a large-diameter water intake head.
Background
At present, water intake heads are widely applied to various thermal power plants and water supply and drainage facilities. The water intake head generally refers to the water intake structure of the ground water intake project, and comprises an inflow device, an intake pipeline, a supporting structure and necessary auxiliary facilities such as a protective enclosure, a guide and control and the like. The water taking head is a water inlet structure of a surface water taking system and is the first part of the whole water taking system.
Due to the existence of wind waves, tides and dark currents, when the water taking head is impacted by water flow in the sea, the direction is changeable, and the impact force is huge. In addition, metal components in the water intake head are easily corroded and damaged in seawater, and the water intake head is also affected by serious biological adhesion and blockage in the sea.
With the increase of water intake, the size of the water intake head is continuously increased, and the maximum diameter of the water intake head exceeds 10m at present. The water intaking head is hollow structure, and to major diameter water intaking head top cap, along with the span increase, its rigidity greatly reduces, and water intaking head upper portion is equipped with into water window simultaneously, leads to the connected node intensity of top cap and lateral wall to be limited. Under the long-term effects such as rivers, corruption, biological influence, the top cap and the lateral wall connected node of major diameter water intaking head produce fatigue failure easily, lead to the top cap to drop, lead to aquatic debris to get into the water intaking leading pipe, make water intaking quality of water worsen, block leading pipeline even, seriously influence water intaking safety.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for repairing a top cover of a large-diameter water intake head, which can effectively recover the function of the water intake head and meet the requirement on the subsequent service life.
The technical scheme adopted by the invention is as follows: a method for repairing a large-diameter water intake head top cover comprises the following steps:
1) the steel frame which is externally wrapped is prefabricated, and the steel grating for water inlet is prefabricated;
2) pouring concrete at the original foundation position of the underwater water intake head to form a lower foundation of the top cover, and embedding connecting bolts in the lower foundation;
3) transporting the prefabricated steel frame to the upper part of the lower foundation in a hoisting mode, and connecting the steel frame with the lower foundation through pre-embedded connecting bolts;
4) after the steel frame is installed, pouring the frame part below the water inlet window on the steel frame in an underwater concrete pouring mode to enable the steel frame and the lower foundation to form a whole;
5) and installing the prefabricated steel grating on the top of the steel frame, namely completing the restoration of the water intake head top cover.
Furthermore, the connecting bolt is embedded and fixed in the lower foundation through underwater epoxy anchor glue.
Further, the steel frame has the external dimension which satisfies the condition that the water taking head is contained in the frame.
Further, the steel frame comprises a plurality of supporting columns and reinforcing hoops, the structure formed by the supporting columns is consistent with the water intake head appearance structure, and the supporting columns are connected into a whole through the annular reinforcing hoops.
Furthermore, the outer side of the upper end of the support column is provided with a grid mounting groove, and the top of the support column is provided with a lifting lug for lifting.
Further, the steel grating and the steel frame are connected through bolts.
Further, the steel grating includes a side ring-type grating and a top plane-type grating.
Furthermore, the steel frame and the steel grating are made of carbon steel, and the surfaces of the steel frame and the steel grating are prevented from corrosion by adopting a mode of combining anticorrosive paint and cathodic protection.
Furthermore, the steel frame and the steel grating are made of duplex stainless steel, and the surfaces of the steel frame and the steel grating are protected by a cathode to prevent corrosion.
The invention adopts the foundation of the underwater concrete pouring steel frame, has simple construction, low cost and lower requirement on construction precision; the external structure is made of the steel frame, the structure can adapt to various water intake heads, the strength is high, the safety requirement of the structure can be met, and in addition, the self weight is light, and the hoisting is convenient; the water inlet steel grating and the steel frame are connected by bolts, so that the requirement of secondary replacement can be met. After the restoration is completed, the restoration structure and the original water intake head form an integral structure, the water flow effect can be well resisted, the service function of the water intake head can be effectively recovered, the structure is safe and reliable, seawater corrosion can be prevented, the restoration cost and the construction difficulty of the water intake head are greatly reduced, and the restoration problem of the top cover of the large water intake head under the background of the prior art can be well solved.
The invention can be suitable for repairing the water intake head cover under various conditions, including fresh water and seawater conditions, and can also be suitable for water intake heads with various shapes, can meet the service life after repair, and has relatively low construction cost and faster construction speed.
Drawings
Fig. 1 is a cross-sectional view of the inventive water intake head cover restoration.
Fig. 2 is a cross-sectional view of the water intake head steel frame of the present invention.
Fig. 3 is a top plan view of the steel grid of the present invention.
Fig. 4 is a schematic view of the top lifting lug of the steel frame of the present invention.
In the figure, 1-steel frame; 2-a steel grating; 3, lifting lugs; 4-a grid mounting groove; 5-a water intake head; 6-connecting bolts; 7-underwater concrete pouring.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method for repairing a large-diameter water intake head top cover, which comprises the following steps:
1) the prefabricated steel frame 1 and the water inlet steel grating 2 are wrapped;
2) pouring concrete at the original foundation position of the underwater water intake head to form a lower foundation 7 of a newly-made top cover, and embedding a connecting bolt 6 in the lower foundation 7;
3) transporting the prefabricated steel frame 1 to the upper part of the lower foundation 7 in a hoisting mode, and connecting the steel frame 1 with the lower foundation 7 through the pre-embedded connecting bolt 6;
4) after the steel frame 1 is installed, pouring the frame part below the water inlet window on the steel frame 1 in an underwater concrete pouring mode to enable the steel frame and the lower foundation to form a whole;
5) and installing the prefabricated steel grating 2 on the top of the steel frame 1, namely completing the repair of the water intake head top cover.
The water intake head cover repair process is described in detail below:
as shown in fig. 1-4, the top cover repairing scheme mainly adopts an external structure to replace the top cover of the original water intake head, and still utilizes the side wall and the bottom plate of the original water intake head, wherein the external structure consists of a lower foundation 7 (concreting underwater), an outer-wrapped steel frame 1 and a water inlet steel grating 2.
The lower foundation 7 is an integral foundation formed by underwater concrete poured around a water intake head and an original water intake head, foundation bolt holes are reserved, and connecting bolts are embedded and fixed in the lower foundation by underwater epoxy anchoring glue.
Outsourcing steel frame 1 is according to the water intaking head overall dimension, need satisfy and include former water intaking head inside the frame, adopt land preparation, steel frame 1 includes many support columns 1.1 and strengthens hoop 1.2, and the structure that many support columns 1.1 arranged into is unanimous with water intaking head overall structure, connects into whole through annular strengthening hoop 1.2 between many support columns, and the support column upper end outside is equipped with grid mounting groove 4, and the support column top is equipped with the lug 3 that is used for the hoist and mount. The steel frame 1 is hoisted in place on water, the steel frame wrapped outside is fixed on the lower foundation through the connecting bolt, underwater installation is adopted, and due to the fact that underwater installation and positioning difficulty is large, the steel frame bolt hole is provided with the elliptical hole, so that the construction positioning difficulty is reduced, and construction errors can be controlled. After the steel frame is installed, a steel plate is used for manufacturing a construction template, and underwater concrete is used for pouring the lower frame of the water inlet window, so that the steel frame and the lower foundation (namely the original water intake head) form a whole.
The steel grating 2 comprises an annular grating 2.1 on the side surface and a planar grating 2.2 on the top, and the water inlet steel grating is connected with the steel frame by bolts and is arranged in a reserved grating mounting groove 4 on the steel frame. The steel grating is connected with the steel frame through bolts, can be installed on land, and can also be installed secondarily in water after the steel frame is fixed.
After the repairing is finished, the periphery of the water intake head is protected against riprap.
The method can be used for repairing the water intake head cover under the condition of fresh water and can also be used under the condition of seawater. In order to adapt to underwater corrosion conditions, the steel frame and the steel grating can be made of common carbon steel under the condition of fresh water, and the corrosion prevention adopts a combined corrosion prevention mode of paint and cathodic protection; in the seawater condition, the steel frame and the water inlet steel grating are made of duplex stainless steel and are protected by a cathode. The steel frame and the steel grating are designed in various corrosion-proof modes, so that the water inlet grating cannot lose effectiveness due to corrosion within the design period of the water intake head, and the damage of the grating to organisms can be reduced due to the gaps of the grating strips and the design of the flow velocity of the grating.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A method for repairing a top cover of a large-diameter water intake head is characterized by comprising the following steps: the method comprises the following steps:
1) the steel frame which is externally wrapped is prefabricated, and the steel grating for water inlet is prefabricated;
2) pouring concrete at the original foundation position of the underwater water intake head to form a lower foundation of the top cover, and embedding connecting bolts in the lower foundation;
3) transporting the prefabricated steel frame to the upper part of the lower foundation in a hoisting mode, and connecting the steel frame with the lower foundation through pre-embedded connecting bolts;
4) after the steel frame is installed, pouring the frame part below the water inlet window on the steel frame in an underwater concrete pouring mode to enable the steel frame and the lower foundation to form a whole;
5) and installing the prefabricated steel grating on the top of the steel frame, namely completing the restoration of the water intake head top cover.
2. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: the connecting bolt is embedded and fixed in the lower foundation through underwater epoxy anchoring glue.
3. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: the external dimension of the steel frame meets the requirement that the water taking head is contained in the frame.
4. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: the steel framework comprises a plurality of supporting columns and reinforcing hoops, the structure formed by the supporting columns is consistent with the appearance structure of the water intake head, and the supporting columns are connected into a whole through the annular reinforcing hoops.
5. The method of repairing a large diameter water intake head cover as claimed in claim 4, wherein: the support column upper end outside is equipped with the grid mounting groove, and the support column top is equipped with the lug that is used for the hoist and mount.
6. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: and the steel grating is connected with the steel frame by bolts.
7. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: the steel grating comprises a lateral annular grating and a top planar grating.
8. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: the steel frame and the steel grating are made of carbon steel, and the surfaces of the steel frame and the steel grating are prevented from corrosion by adopting a mode of combining anticorrosive paint and cathodic protection.
9. The method for repairing a large-diameter water intake head cover according to claim 1, wherein: the steel frame and the steel grating are made of duplex stainless steel, and the surfaces of the steel frame and the steel grating are protected against corrosion in a cathode protection mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011625025.2A CN112796368B (en) | 2020-12-31 | 2020-12-31 | Repairing method for large-diameter water intake head top cover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011625025.2A CN112796368B (en) | 2020-12-31 | 2020-12-31 | Repairing method for large-diameter water intake head top cover |
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| CN112796368A true CN112796368A (en) | 2021-05-14 |
| CN112796368B CN112796368B (en) | 2023-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114250825A (en) * | 2021-12-17 | 2022-03-29 | 自然资源部天津海水淡化与综合利用研究所 | Assembled ecological seawater taking head |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114250825A (en) * | 2021-12-17 | 2022-03-29 | 自然资源部天津海水淡化与综合利用研究所 | Assembled ecological seawater taking head |
| CN114250825B (en) * | 2021-12-17 | 2023-05-09 | 自然资源部天津海水淡化与综合利用研究所 | Assembled ecological seawater intake head |
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| Publication number | Publication date |
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| CN112796368B (en) | 2023-08-18 |
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