CN113653130A - Water taking system based on offshore platform and construction method thereof - Google Patents
Water taking system based on offshore platform and construction method thereof Download PDFInfo
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- CN113653130A CN113653130A CN202110966486.4A CN202110966486A CN113653130A CN 113653130 A CN113653130 A CN 113653130A CN 202110966486 A CN202110966486 A CN 202110966486A CN 113653130 A CN113653130 A CN 113653130A
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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
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Abstract
The application belongs to the technical field of water supply systems, and particularly relates to a water taking system based on an offshore platform. The water taking system based on the offshore platform comprises water taking equipment arranged on a water area; the water taking device comprises a circulating water pump, a water raising pipe and a water delivery pipe. The upper end of the water delivery pipe is connected with the water inlet of the circulating water pump; the lower end extends into the water surface and is suspended in the water. The water delivery pipe comprises an equal-height pipeline which is arranged at equal height with the circulating water pump and a high-position pipeline which is arranged higher than the circulating water pump; and a water treatment structure and a power distribution structure are built below the high-level pipeline. The water intaking system of this application is direct to fix water intaking equipment on the surface of water, and the pumping pipe through water intaking equipment directly extracts the sea water from the waters, has saved substructure and diversion structures of traditional circulating water pump house, and the earthwork excavation volume of having avoided in the work progress is big, deep basal pit supports and stagnant water engineering measure expense is high, the big scheduling series problem of risk, can reduce the construction degree of difficulty and cycle, reduces the engineering investment.
Description
Technical Field
The application relates to the technical field of water supply systems, in particular to a water taking system based on an offshore platform and a construction method thereof.
Background
The cooling water source required by the seaside power plant usually adopts a primary circulation direct-current water supply system, and the seawater is boosted to a steam turbine room condenser through a circulating water pump and then discharged to the sea after heat exchange. Every unit of conventional thermal power plant disposes two circulating water pumps, and every water pump disposes into trash cleaning equipment such as gate, trash rack, rotary filter screen, and the circulating water pump room is arranged on the land area near the seaside, and the water intaking system of circulating water pump room mainly comprises diversion open channel or water intaking head + box culvert, pump room lower part runner of intaking etc. has that concrete placement volume is big, the foundation ditch is deep, excavates characteristics that earthwork volume is big.
Because seaside is usually a silt layer, the foundation condition is very poor, special construction schemes such as deep foundation pit support, cofferdam construction and water stop and precipitation need to be adopted, so that a series of problems such as large construction difficulty, high risk, long period and high engineering measure cost exist in a seaside water taking pump room, the construction progress of main engineering of a power plant is seriously influenced, and the comprehensive cost is high.
Therefore, it is desirable to design a water intake system based on an offshore platform, which has low cost and short construction period.
Disclosure of Invention
To above-mentioned problem, this application provides a water intaking system based on offshore platform, and water intaking system directly stretches into the waters and gets water with water intaking equipment direct mount on the surface of water in waters, utilizes the lifting pipe. Compared with traditional water taking equipment, the method and the device have the advantages that the step of excavating the water diversion ditch is omitted, the construction cost is low, and the construction period is short.
According to an embodiment of the present application, a first aspect provides an offshore platform based water intake system, including a water intake device installed on a water area; the water taking equipment comprises a circulating water pump and a water raising pipe; the upper end of the water raising pipe is connected with a water inlet of the circulating water pump, and the lower end of the water raising pipe extends into the water below and is suspended in the water.
Preferably, the water taking device further comprises a water delivery pipe connected with a water outlet of the circulating water pump;
the water delivery pipe comprises an equal-height pipeline which is arranged at equal height with the circulating water pump and a high-position pipeline which is arranged higher than the circulating water pump;
and a water treatment structure and a power distribution structure are built below the high-level pipeline.
Preferably, the water intake system further comprises a filtration apparatus mounted upstream of the water treatment structure;
the filtering equipment comprises a scraper type filter arranged on the equal-height pipeline; and the transmission mechanism of the scraper type filter is positioned below the high-level pipeline, is arranged at the outer side of the equal-height pipeline and is used for transmitting torque for a scraper of the scraper type filter.
Preferably, the filtering apparatus further comprises a trash rack; the trash rack is arranged at the lower end of the lifting pipe; the height of the trash rack is not less than the diameter of the lifting pipe.
Preferably, the water taking system further comprises a protection bottom positioned below the water raising pipe, and the protection bottom is made of rock blocks or prefabricated plates thrown and filled in the water bottom.
Preferably, the water intake system further comprises an offshore platform structure, the offshore platform structure comprising:
the main platform is used for fixing the water raising pipe, the circulating water pump and the equal-height pipeline;
a cap pile supporting the main platform from below by vertical piles and cross batter piles;
and the pipeline platform is positioned on the main platform and used for supporting the high-level pipeline.
Preferably, the water intake devices are uniformly distributed on the main platform in a linear manner; the spacing distance between the adjacent water taking devices is not less than four times of the diameter of the water raising pipe.
According to an embodiment of the present application, a second aspect provides an offshore platform based water intaking system, comprising the following steps:
building an offshore platform structure on the water surface;
and installing a water taking device based on the offshore platform structure.
Preferably, the establishing an offshore platform structure at the water surface comprises:
constructing a bearing platform pile by adopting an offshore pile driving barge;
constructing a main platform on the bearing platform pile by adopting a reinforced concrete cast-in-place or prefabricated structure;
building a pipeline platform on the main platform;
the installation of water intake equipment based on the offshore platform structure comprises:
hoisting construction is adopted to install the high-altitude pipelines of the poplar water pipe, the circulating water pump and the water conveying pipe of the water taking equipment on the main platform;
and a high-level pipeline for installing the water delivery pipe on the pipeline platform.
Preferably, the method further comprises the steps of constructing a water treatment structure and a power distribution control structure of the water taking equipment below the pipeline platform while installing the water taking equipment based on the offshore platform structure;
the lower end of the lifting pipe is provided with a trash rack with the height not less than the diameter of the lifting pipe;
and a scraping blade of the scraping blade type filter is arranged in the equal-height pipeline, and a transmission mechanism of the scraping blade type filter is arranged below the high-position pipeline.
The application discloses water intaking system based on offshore platform directly fixes water intaking equipment on the surface of water, directly extracts the sea water from the waters through the lifting pipe of water intaking equipment. Compared with the traditional circulating water pump house, the lower structure and the diversion structures of the traditional circulating water pump house are omitted, the series problems that the earth excavation amount is large, the deep foundation pit supporting and water stopping engineering measure cost is high, the risk is large and the like in the construction process are avoided, the construction difficulty and period can be reduced, and the engineering investment is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
fig. 2 is a schematic diagram of the distribution structure of the devices on the main platform.
In the figure, a circulating water pump 1, a water raising pipe 2, an equal-height pipeline 3, a high-level pipeline 4, an elbow 5, a transition pipe 6, a trash rack 7, a scraping filter 8, a transmission mechanism 9, a vertical pile 10, a crossed inclined pile 11, a main platform 12, a pipeline platform 13, a shear wall 14, a motor platform 15, a water pump motor 16, a water treatment structure 17 and a power distribution structure 18.
Detailed Description
The following is further detailed by the specific embodiments:
the offshore platform based water intake system mainly comprises an offshore platform structure built in a water area, and a water intake device, a filtering device, a water treatment structure 17 and a power distribution structure 18 of the water intake device which are arranged on the offshore platform structure.
This implementation will take water equipment direct mount on the surface of water, compare in traditional circulating water pump house structure, the substructure and the diversion structure of traditional circulating water pump house have been saved to this embodiment, have avoided the earthwork excavation volume in the work progress big, deep basal pit struts and stagnant water engineering measure expense high, risk series problems such as big, can reduce the construction degree of difficulty and cycle, reduce the engineering investment.
The water taking device comprises a circulating water pump 1, and a water raising pipe 2 and a water delivery pipe which are connected with the circulating water pump 1. Wherein, the one end (upper end) of lifting pipe 2 is connected with circulating water pump 1's water inlet, and the other end (lower extreme) of lifting pipe 2 stretches into the surface of water below, and unsettled the arrangement in the waters.
The water delivery pipe is connected with the water outlet of the circulating water pump 1 and comprises an equal-height pipeline 3 which is arranged at the same height as the circulating water pump 1 and a high-position pipeline 4 which is arranged at a high position, and the equal-height pipeline 3 is connected with the high-position pipeline 4 through an elbow 5 and a vertical transition pipe 6. It should be noted that, for the convenience of installation, the water inlet of the circulating water pump 1 is oriented vertically, and the water outlet of the circulating water pump 1 is oriented horizontally toward the coast. The equal-height arrangement in this embodiment means that the equal-height pipeline 3 and the water outlet of the circulating water pump 1 are integrally installed on the same plane, and a small-range height difference is allowed to exist between the water outlet of the circulating water pump 1 and the equal-height pipeline 3 due to the connection mode. The high-level installation means that the installation plane of the high-level pipe 4 is higher than the installation plane of the circulating water pump 1, and a certain space is provided between the installation plane of the high-level pipe 4 and the installation plane of the circulating water pump 1, that is, the space is the installation space of the water treatment structure 17 and the power distribution structure 18 of the water intake facility in the present embodiment. In the present embodiment, the water treatment structure 17 includes, but is not limited to, a seawater chlorination plant, and the power distribution structure 18 of the water intake facility includes, but is not limited to, a power distribution plant and a control room of the water intake facility. The high level duct 4 in this embodiment has an installation space below it with a height of about 4.5 m.
The filtering equipment is arranged at the upstream of a water treatment structure 17, and specifically comprises a trash rack 7 arranged at the upstream of the circulating water pump 1 and a scraper type filter 8 arranged at the downstream of the circulating water pump 1. Wherein, trash rack 7 is for installing the tube-shape trash rack 7 at the lift pipe 2 lower extreme, and the height of tube-shape trash rack 7 is not less than the diameter of lift pipe 2. In order to ensure the filtering effect and the economy, the height of the cylindrical trash rack 7 in the embodiment is equal to the diameter of the lifting pipe 2.
In order to prevent silt on the sea bottom from being directly sucked into the riser pipes 2, the height of the trash rack 7 from the bottom of the sea water is not less than 2 times the diameter of the riser pipes 2, in the embodiment, the height of the trash rack 7 from the sea bottom is about 5m, and block stones or prefabricated plates are thrown at the bottom of the sea water to protect the bottom.
The scraper filter 8 is preferably an electric scraper filter 8, and the electric scraper filter 8 is installed in an equal-height pipeline 3 arranged at equal height of the water delivery pipe and the circulating water pump 1. The cylindrical trash rack 7 and the second filtering device are used for carrying out trash cutting and automatic backwashing on the seawater, and the quality of the seawater can be effectively guaranteed.
Since the scraping blades of the scraping blade type filter 8 are coaxially arranged in the equal-height pipeline 3, and the motor of the filter needs to transmit torque for the scraping blades through the transmission mechanism 9, the transmission mechanism 9 needs to be provided with a transmission shaft coaxial with the scraping blades to connect the scraping blades. In some embodiments, the transport pipe is a straight pipe, and the transmission mechanism 9 needs to be arranged inside the transport pipe to ensure that the transmission shaft of the transmission mechanism 9 is coaxial with the doctor blade. After the transmission mechanism 9 is arranged in the transportation pipeline, the transmission mechanism 9 is soaked in seawater in the transportation pipeline, and the transmission mechanism 9 is seriously corroded, so that the service life of the electric scraper type filter 8 is short.
In the embodiment, because the height difference exists between the equal-height pipeline 3 and the high-position pipeline 4, the transmission shaft of the transmission mechanism 9 can be coaxially arranged with the scraping blade outside the equal-height pipeline 3, so that the transmission mechanism 9 is prevented from being corroded by seawater in the equal-height pipeline 3, and the service life of the scraping blade type filter 8 is prolonged. Specifically, the transmission mechanism 9 is preferably a gear box, the transmission mechanism 9 is installed below the high-level pipeline 4, and a transmission shaft on the transmission mechanism 9 penetrates through an upper bent pipe of the high-level pipeline 3 from the outer side of the high-level pipeline 3 and extends into the high-level pipeline 3 to be connected with the scraper. The water delivery pipe in the embodiment can be used for reasonably installing the water treatment structure 17 and the power distribution structure 18 of the water taking equipment, so that the structure of the water taking system is compact, the transmission mechanism 9 can be prevented from being corroded by seawater inside the equal-height pipeline 3, and the electric scraper filter 8 is prolonged. And compare in traditional circulating water pump 1 and arranged in proper order on the runner steel gate, block dirty equipment such as grid 7, rotary filter screen, traditional equipment cost of decontaminating is high, receives the influence of sea water corruption and marine life, has the circumstances such as equipment corrosion, deformation, jam, maintenance difficulty after long-time operation. The embodiment can reduce the cost of the trash holding equipment and improve the operability of overhauling.
In this embodiment, the offshore platform structure comprises, from bottom to top, a cap pile, a main platform 12 and a pipeline platform 13 in this order. The cap piles include vertical piles 10 and cross-slant piles 11 formed by the construction of the offshore pile driving vessel. The vertical piles 10 bear vertical bearing force, and the crossed inclined piles 11 mainly provide horizontal resistance. The vertical inclination angle of the crossed inclined piles 11 is about 10 degrees, the horizontal inclination angle is about 20 degrees, and the collision of the matched crossed inclined piles 11 can be avoided. The stability of the support structure is ensured by the vertical piles 10 and the cross batter piles 11.
The main platform 12 is fixed on the pile of the bearing platform by adopting a reinforced concrete cast-in-place or prefabricated structure. The water raising pipe 2 of the water taking device is positioned at one side far away from the coast, and the circulating water pump 1 of the water taking device and the equal-height pipeline 3 of the water delivery pipe are both fixed on the main platform 12. The pipeline platform 13 is located on the side of the main platform 12 near shore. The upper surface of the pipeline platform 13 supports the high-level pipeline 4 arranged at a high position, and a water treatment structure 17 and a power distribution structure 18 are built between the lower part of the pipeline platform 13 and the main platform 12, so that the space above the main platform 12 is fully utilized.
As shown in fig. 2, the water intake system of the present embodiment has seven water intake devices that are linearly and uniformly distributed, and specifically, the distance between adjacent water intake devices is not less than 4 times the diameter of the draft tube 2. According to model experiments, the following results are obtained: when the interval of arranging between the water intaking equipment reaches 4 to 5 times the diameter of lifting pipe 2, can effectively reduce the interact between the adjacent water intaking equipment, can avoid the water absorption efficiency reduction of water intaking equipment.
This embodiment utilizes 1 direct extraction sea water of many circulating water pumps according to the actual water intaking demand under the 1 normal use condition of guarantee circulating water pump, can save the diversion ditch in traditional circulating water pump house, reduces the excavation volume. In this embodiment, the valves connected with each other are arranged on the high-level pipeline 4 of the water pipe, so that the water pipe can be operated independently or jointly, and the reliability of water supply is improved.
In the present embodiment, in order to prevent the water pump motor 16 of the circulating water pump 1 from being excessively vibrated, a motor platform 15 for fixing the water pump motor 16 is built on the main platform 12, and a shear wall 14 made of reinforced concrete is disposed at one side of the water pump motor 16. In order to facilitate the transportation of the materials, the water taking system in the embodiment is combined with the transportation wharf of the power station, so as to borrow the transportation channel of the transportation wharf.
The embodiment also provides a construction method of the water taking system based on the offshore platform, which comprises the following steps:
building an offshore platform structure on the water surface;
water intaking equipment is installed based on offshore platform structure.
Wherein, establishing offshore platform structure at the surface of water includes: a pile cap pile is built by adopting an offshore pile driving barge, a main platform 12 is built on the pile cap pile by adopting a reinforced concrete cast-in-place or prefabricated structure, and a pipeline platform 13 is built on the main platform 12.
Water intaking equipment includes based on offshore platform structure installation: the main platform 12 is provided with a poplar water pipe of water taking equipment, a circulating water pump 1, a high-level pipeline 3 of the water pipe and a high-level pipeline 4 of the water pipe which is fixed on the pipeline platform 13 by a hoisting method. Wherein, the upper end of the lifting pipe 2 is connected with the water inlet of the circulating water pump 1, and the lower end extends into the water surface below and is suspended in the water. The water delivery pipe is connected with the water outlet of the circulating water pump 1, the equal-height pipeline 3 of the water delivery pipe is arranged at the equal height with the circulating water pump 1, and the high-position pipeline 4 of the water delivery pipe is arranged higher than the circulating water pump 1.
The construction method further comprises the following steps: while installing water intake equipment based on the offshore platform structure, a water treatment structure 17 and a power distribution control structure of the water intake equipment are built below the pipeline platform 13; a trash rack 7 with the height not smaller than the diameter of the water raising pipe 2 is arranged at the lower end of the water raising pipe 2, a scraping blade of a scraping blade type filter 8 is arranged in the equal-height pipeline 3, and a transmission mechanism 9 of the scraping blade type filter 8 is arranged below the high-position pipeline 4; and building a water treatment structure 17 and a power distribution structure 18 under the high-level pipeline 4; and the block stone or the precast slab protection bottom is thrown and filled at the seabed below the water raising pipe 2. Since the size requirement of the water intake system has already been explained in the foregoing, the detailed description of the construction method is omitted.
Taking a water taking system of a certain coastal power station as an example: the pile of the bearing platform of the water taking system is a vertical pile 10 and a crossed inclined pile 11 which are built according to the diameter of 1200 mm. 9 water taking devices are installed on the main platform 12, for example, 9 circulating water pumps 1 of a 4 × 250MW unit, the size of the lower structure of a circulating water pump room is 55m × 45m (length × width), the depth of the pump room is 13m, the wall thickness of a pump room pool is 1.2m, and the thickness of a bottom plate is 1.4 m. The main parameters of the water intake system and the traditional circulating water pump room in the embodiment are shown in table 1.
Table 1:
according to comparative analysis of the table 1, compared with the traditional circulating water pump house structure, the water taking system in the embodiment is constructed, the construction process is simplified, the construction period is saved by five months, the investment cost is saved by about 1896.42 ten thousand yuan, and the economic and social benefits are better.
The water intake system based on the offshore platform is not limited to be used in the sea area, and the scheme can be adopted to take water in water areas such as rivers and lakes.
The application is not limited solely to the description and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the application is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. The water taking system based on the offshore platform is characterized by comprising water taking equipment arranged on a water area; the water taking equipment comprises a circulating water pump and a water raising pipe; the upper end of the water raising pipe is connected with a water inlet of the circulating water pump, and the lower end of the water raising pipe extends into the water below and is suspended in the water.
2. The offshore platform based water intake system of claim 1, wherein: the water taking equipment also comprises a water delivery pipe connected with a water outlet of the circulating water pump;
the water delivery pipe comprises an equal-height pipeline which is arranged at equal height with the circulating water pump and a high-position pipeline which is arranged higher than the circulating water pump;
and a water treatment structure and a power distribution structure are built below the high-level pipeline.
3. The offshore platform based water intake system of claim 2, wherein: the water intake system further comprises a filtration device installed upstream of the water treatment structure;
the filtering equipment comprises a scraper type filter arranged on the equal-height pipeline; and the transmission mechanism of the scraper type filter is positioned below the high-level pipeline, is arranged at the outer side of the equal-height pipeline and is used for transmitting torque for a scraper of the scraper type filter.
4. The offshore platform based water intake system of claim 3, wherein: the filtering equipment further comprises a trash rack; the trash rack is arranged at the lower end of the lifting pipe; the height of the trash rack is not less than the diameter of the lifting pipe.
5. The offshore platform based water intake system of claim 3 or 4, wherein: the water taking system also comprises a protective bottom positioned below the water raising pipe, and the protective bottom is made of rock blocks or prefabricated plates which are thrown and filled in the water bottom.
6. The offshore platform based water intake system of claim 5, wherein: the water intake system further includes an offshore platform structure, the offshore platform structure comprising:
the main platform is used for fixing the water raising pipe, the circulating water pump and the equal-height pipeline;
a cap pile supporting the main platform from below by vertical piles and cross batter piles;
and the pipeline platform is positioned on the main platform and used for supporting the high-level pipeline.
7. The offshore platform based water intake system of claim 6, wherein: the water taking equipment is linearly and uniformly distributed on the main platform; the spacing distance between the adjacent water taking devices is not less than four times of the diameter of the water raising pipe.
8. The construction method of the water taking system based on the offshore platform comprises the following steps:
building an offshore platform structure on the water surface;
and installing a water taking device based on the offshore platform structure.
9. The construction method according to claim 8, wherein: the establishing an offshore platform structure at the water surface comprises:
constructing a bearing platform pile by adopting an offshore pile driving barge;
constructing a main platform on the bearing platform pile by adopting a reinforced concrete cast-in-place or prefabricated structure;
building a pipeline platform on the main platform;
the installation of water intake equipment based on the offshore platform structure comprises:
hoisting construction is adopted to install the high-altitude pipelines of the poplar water pipe, the circulating water pump and the water conveying pipe of the water taking equipment on the main platform;
and a high-level pipeline for installing the water delivery pipe on the pipeline platform.
10. The construction method according to claim 9, wherein: the method also comprises the steps of constructing a water treatment structure and a power distribution control structure of the water taking equipment below the pipeline platform while installing the water taking equipment based on the offshore platform structure;
the lower end of the lifting pipe is provided with a trash rack with the height not less than the diameter of the lifting pipe;
and a scraping blade of the scraping blade type filter is arranged in the equal-height pipeline, and a transmission mechanism of the scraping blade type filter is arranged below the high-position pipeline.
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| CN202110966486.4A CN113653130B (en) | 2021-08-23 | 2021-08-23 | Water taking system based on offshore platform and construction method thereof |
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| CN202110966486.4A CN113653130B (en) | 2021-08-23 | 2021-08-23 | Water taking system based on offshore platform and construction method thereof |
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| JP2006214256A (en) * | 2005-02-07 | 2006-08-17 | Hotsuma Kobo Kk | Techniques to take water from oceanic deep-water areas at low costs |
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