Large pipeline water taking head and water taking head mounting method

Abstract

The invention relates to the technical field of water taking and draining, in particular to a large pipeline water taking head and a water taking head installing method.The large pipeline water taking head comprises an upper water taking head body, and the upper water taking head body is provided with a plurality of screens; the bottom of the upper water taking head is communicated with a vertical pipe, a base is arranged at the bottom of the vertical pipe, and the vertical pipe is communicated with a water taking pipeline; the vertical pipe comprises an upper vertical pipe body and a lower vertical pipe body, the top of the upper vertical pipe body is fixedly connected with the upper water taking head, the lower portion of the lower vertical pipe body is fixedly connected with the base, and the upper vertical pipe body and the lower vertical pipe body are connected in a mortise and tenon joint mode. According to the large pipeline water taking head, the vertical pipe is divided into the upper vertical pipe and the lower vertical pipe, and the problems that a traditional water taking head of an integrated structure is large in size, heavy in weight and difficult to hoist on the sea are solved; the upper vertical pipe and the lower vertical pipe are connected in a mortise and tenon joint mode, connection is firm, alignment is convenient, and the butt joint efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water intake and drainage, and in particular to a large-scale pipeline water intake head and a water intake head installation method. Background Art

[0002] Seawater cooling system is a cooling system that uses seawater as cooling medium. It is widely used in industrial facilities such as power plants, chemical plants, and refineries that require a large amount of heat exchange. Large seawater cooling system (design flow rate exceeds 150,000m 3 / h) requires drawing seawater from the ocean as a cooling medium. One end of the water intake pipeline is connected to the water intake head on the sea side, and the other end is connected to the water intake pump station on the land side. Due to the huge water intake of large seawater cooling systems, not only the diameter of the large pipe used as the water intake pipeline may exceed 3000mm, but also the volume of the water intake head as the source of seawater transportation for the entire seawater cooling system is also huge (covering an area of ​​more than 100m 2 , the height of the water intake head exceeds 9m, and the mass of a single water intake head exceeds 500t). At present, the existing common water intake heads are small in size and are mostly one-piece cast structures, which are difficult to meet the water intake requirements of large seawater cooling systems. The large one-piece cast water intake heads are heavy and difficult to hoist at sea, which greatly slows down the construction process. Summary of the invention

[0003] The purpose of the present invention is to overcome the problem that the existing ordinary water intake head has a small water intake capacity and is difficult to meet the water intake needs of large pipelines; the large integrated cast water intake head is heavy and is not suitable for offshore lifting, and to provide a large pipeline water intake head and a water intake head installation method.

[0004] In a first aspect, the present invention provides a large-scale pipeline water intake head, comprising an upper water intake head, the upper water intake head is provided with a plurality of screens, the screens are used to filter seawater; the bottom of the upper water intake head is connected to a riser, a base is provided at the bottom of the riser, the riser is connected to a water intake pipeline, and the riser is used to transport seawater to the water intake pipeline; the riser comprises an upper riser and a lower riser, the top of the upper riser is fixedly connected to the upper water intake head, the lower part of the lower riser is fixedly connected to the base, and the upper riser and the lower riser are connected by mortise and tenon joints.

[0005] The large-scale pipeline water intake head provided by the present invention overcomes the problems of large volume, heavy weight and difficulty in hoisting at sea of ​​the traditional integrated structure water intake head by dividing the riser into an upper riser and a lower riser. The upper water intake head + upper riser and the lower riser + base can be hoisted and transported separately and spliced ​​at the construction site. During the hoisting operation at sea, the load of the hoisting equipment is significantly reduced, which reduces the risk in the hoisting process, improves the safety of offshore construction, and significantly improves the construction efficiency.

[0006] The upper and lower risers are designed with mortise and tenon joints, which not only provide a strong connection, but also provide a natural guiding function. When installing the upper and lower risers, the tenon and mortise groove can be automatically aligned without the need for additional guiding tools or complicated adjustment steps. This not only speeds up the installation, but also reduces the operating requirements for skilled workers, improves construction efficiency, and reduces the sealing problems or strength reduction that may be caused by docking deviation.

[0007] Preferably, the upper water intake head and the riser are both octagonal structures.

[0008] The upper water intake head and riser are both octagonal structures, which have higher geometric stability than other geometric configurations, can better disperse water flow impact and ocean wave loads, effectively reduce the risk of deformation in complex marine environments, and extend the service life of the large pipeline water intake head.

[0009] The riser is also designed as an octagon, which gives it clear edges and corners, facilitating accurate alignment during installation. Combined with the mortise and tenon joints between the upper and lower risers, the octagonal edges can further provide a visual guide reference, simplifying the riser docking operation during construction, and is particularly suitable for rapid installation in complex offshore environments.

[0010] Preferably, the screen is arranged on eight sides of the upper water intake head.

[0011] Screens are set on each side of the octagonal upper water intake head, so that the water intake head can achieve all-round and multi-faceted water intake, expand the filtration area, make more water pass through per unit time, and improve the ability to filter impurities, significantly improving the water intake efficiency. Compared with the traditional design of arranging screens in only one direction, this structure can make fuller use of the surrounding seawater resources, especially when the water flow direction changes, it can still maintain efficient water intake performance.

[0012] The multi-screen design allows water to enter from multiple directions, reducing the flow rate pressure of a single screen, thereby reducing the possibility of marine impurities (such as seaweed, fish, sand, etc.) accumulating on a certain screen. This not only extends the cycle of screen cleaning and replacement, but also improves the continuity of system operation.

[0013] Preferably, the aperture of the sieve is 90 mm-110 mm.

[0014] The mesh aperture is designed to be 90mm-110mm, ensuring that larger marine impurities (such as seaweed, pumice, plastic waste, etc.) are effectively filtered out to prevent them from entering the water intake pipeline and possibly causing damage to downstream equipment. At the same time, the aperture size is large enough to allow seawater to pass smoothly, avoiding blockage problems caused by too small apertures or excessive flow rate reduction, ensuring a large enough water flow rate to meet the needs of large seawater cooling systems for high water intake flow.

[0015] Preferably, it further comprises a chlorine addition pipe, which is located in the vertical pipe and is used for adding chlorine into the vertical pipe.

[0016] The chlorination tube is used to inject chlorine gas or chloride solution into the riser, which can effectively reduce the accumulation of marine organisms and their metabolites in the screen, riser and water intake pipe, avoid the local blockage caused by this, ensure the smooth circulation of seawater and the stability of water intake efficiency, protect downstream pipelines and equipment from biological fouling, reduce the burden of subsequent deep treatment, and improve the operational reliability of the entire system.

[0017] In a second aspect, the present invention provides a water intake head installation method for installing the above-mentioned large-scale pipeline water intake head, comprising the following steps:

[0018] S1: Prefabrication of water intake head in sections: integrally cast the upper water intake head and the upper riser, integrally cast the lower riser and the base, pre-embed the first bolt and the second bolt at the joint of the upper riser and the lower riser, the first bolt is pre-embedded in the lower riser, and the second bolt is pre-embedded in the upper riser;

[0019] S2: Excavation and leveling of the subgrade: Excavate the water head subgrade to the designed height, and perform stone throwing and leveling of the subgrade;

[0020] S3: Water intake head installation on barge: The upper water intake head and upper riser, lower riser and base are hoisted and placed on the barge step by step, and then the barge is towed to the installation area;

[0021] S4: Installation of water intake head: Use a crane ship to first lift the lower riser and base. After the base is installed in place and limited, lift the upper water intake head and upper riser. Divers go into the water to assist in the installation, so that the upper riser and the lower riser are connected by mortise and tenon joints;

[0022] S5: Water intake head docking: overlap and tie the steel bars at the joint of the upper riser and the lower riser, fix the beam support and the lower riser with the pre-buried first bolts, install the template on the top of the beam support, connect the top of the template with the second bolts through the tie rod, and pour underwater concrete;

[0023] S6: Backfill: Backfill in layers to at least 1.5m from the top of the water intake pipe.

[0024] The water intake head installation method provided by the present invention prefabricates the water intake head into sections as an integrated structure of an upper water intake head and an upper riser, and an integrated structure of a lower riser and a base. Through the coordinated design of mortise and tenon connections and embedded bolts, the workload of on-site assembly is significantly simplified, the single unit weight of each module is reduced, the capacity requirements of lifting and transportation equipment are reduced, and the dependence on construction site conditions is reduced.

[0025] The embedded first and second bolts provide a stable connection point for the installation of the beam support and the formwork, ensuring that the underwater concrete poured at the joint of the upper and lower risers is stable, effectively improving the structural strength and overall impact resistance of the joint of the upper and lower risers. The layered backfill method is adopted to at least 1.5m above the top of the water intake pipe, ensuring the stability and anti-buoyancy capacity of the pipe and water intake head structure.

[0026] The water intake head installation method of the present invention not only significantly simplifies the construction process and improves the construction efficiency through scientific and reasonable segmented prefabrication, modular assembly and efficient assembly design, but also enhances the reliability and applicability of the structure, and is particularly suitable for the installation requirements of water intake heads of large seawater cooling systems.

[0027] Preferably, at least two first bolts are embedded in each surface of the lower vertical pipe in S1.

[0028] At least two first bolts are embedded in each face of the lower riser to ensure that at least two beam supports can be installed on each face of the lower riser, thereby ensuring the stability of the template installation and ensuring that the underwater concrete poured at the joint of the upper riser and the lower riser is stable.

[0029] Preferably, in S2, a guide rail scraper method is used to level the base bed.

[0030] The guide rail scraper method sets a guide rail on the base bed and moves the scraper equipment on the guide rail to ensure that the scraper's running track is always at the designed height, effectively avoiding the base bed height error caused by manual operation or unstable equipment, improving the leveling accuracy, and laying the foundation for the stable installation of the water intake head base.

[0031] Preferably, when lifting the lower riser and the base in S3, four lifting rings are evenly arranged on the base first; when lifting the upper water intake head and the upper riser, four lifting rings are evenly arranged on the top of the upper water intake head first.

[0032] The lower riser and base, the upper water intake head and the upper riser are all large components with heavy weight and large volume. By evenly arranging four lifting rings on the base and the upper water intake head, it can ensure that the slings are evenly stressed during the lifting process, avoiding structural deformation or sling breakage due to excessive force at a single point, making the lifting process smoother, avoiding shaking or tilting of the structure, and significantly improving the safety of lifting.

[0033] Preferably, when backfilling in layers is performed in S6, the first layer is backfill sand, and the range of the first backfill layer is from the base to the top of the water intake pipe, and the second layer is facing stone, and the range of the second backfill layer is at least 1.5m from the first backfill sand to the top of the water intake pipe.

[0034] The first layer is backfilled with sand, whose fine structure can evenly distribute the pressure under the base and riser, avoiding settlement or deformation caused by local stress, thereby improving the overall stability of the water head foundation. The second layer of face stones has a larger block size and weight, which can effectively resist the scouring of sea currents or waves, prevent the base bed from being eroded, and ensure the long-term stability of the water head.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The large-scale pipeline water intake head provided by the present invention overcomes the problems of large size, heavy weight and difficulty in lifting at sea of ​​the traditional integrated structure water intake head by dividing the riser into an upper riser and a lower riser. The upper water intake head + upper riser and the lower riser + base can be lifted and transported separately and spliced ​​at the construction site. During the offshore lifting operation, the load of the lifting equipment is significantly reduced, which reduces the risk in the lifting process, improves the safety of offshore construction, and significantly improves the construction efficiency;

[0037] 2. The large-scale pipeline water intake head provided by the present invention is designed with a mortise and tenon connection between the upper riser and the lower riser. The mortise and tenon connection not only has a strong connection performance, but also provides a natural guiding function. When installing the upper riser and the lower riser, the cooperation of the tenon and the mortise groove can achieve automatic alignment without the need for additional guiding tools or complicated adjustment steps. This not only speeds up the installation speed, but also reduces the operating requirements for technical workers for installation, improves construction efficiency, and reduces sealing problems or strength reduction that may be caused by docking deviation.

[0038] 3. The water intake head installation method provided by the present invention not only significantly simplifies the construction process and improves the construction efficiency, but also enhances the reliability and applicability of the structure through scientific and reasonable segmented prefabrication, modular assembly and efficient assembly design. It is particularly suitable for the installation requirements of water intake heads of large seawater cooling systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Take the main view of the water head for large pipelines;

[0040] Figure 2 Take the side view of the water head for large pipes;

[0041] Figure 3 Take a top view of the water head for large pipelines;

[0042] Figure 4 Take a cross-sectional view of the water head for a large pipeline;

[0043] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0044] Figure 6 This is a schematic diagram of the underwater template;

[0045] Figure 7 This is a cross-sectional diagram of the water intake head backfill for a large pipeline.

[0046] Markings in the figure:

[0047] 1-upper water intake head, 11-screen, 2-riser, 21-upper riser, 22-lower riser, 3-base, 4-chlorination pipe, 5-first bolt, 6-second bolt, 7-beam support, 8-formwork, 9-pull rod, 100-water intake pipe, 101-backfill sand, 102-facing stone. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0049] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0050] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0051] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0052] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0053] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0054] Example 1

[0055] like Figure 1-Figure 5 As shown, this embodiment provides a large-scale pipeline water intake head, including an upper water intake head 1, and the upper water intake head 1 is provided with a plurality of screens 11, and the screens 11 are used to filter seawater. Specifically, as Figure 3 , Figure 4 As shown, in this embodiment, the orthographic projection of the upper water intake head 1 can be an octagonal structure, for example, each side length can be 5m-5.5m, and a screen 11 is arranged on the side where each side of the octagonal water intake head 1 is located, and the aperture of the screen 11 can be set to 90mm-110mm, preferably 100mm.

[0056] A screen 11 is arranged on each side of the upper water intake head 1 of the octagon, so that the water intake head can achieve all-round and multi-faceted water inflow, expand the filtration area, and make more water pass through per unit time, while improving the filtering ability of impurities, and significantly improving the water intake efficiency. Compared with the traditional design of arranging screens in only a single direction, this structure can make more full use of the surrounding seawater resources, especially when the direction of the water flow changes, it can still maintain efficient water intake performance. In addition, the multi-screen design allows the water flow to enter from multiple directions in a dispersed manner, reducing the flow rate pressure of a single screen, thereby reducing the possibility of marine impurities (such as seaweed, fish, sand and stones, etc.) accumulating on a certain screen. In this way, not only the cycle of cleaning and replacing the screen 11 is extended, but also the continuity of the system operation is improved.

[0057] The preferred aperture of the screen 11 is 90 mm to 110 mm, ensuring that larger marine impurities (such as seaweed, pumice, plastic waste, etc.) are effectively filtered out to prevent them from entering the water intake pipe 100 and possibly causing damage to downstream equipment. At the same time, the aperture size is sufficient to allow seawater to pass smoothly, avoiding blockage problems caused by too small apertures or excessive flow rate reduction, ensuring a sufficiently large water flow rate, thereby meeting the requirements of large seawater cooling systems for high water intake flow.

[0058] The bottom of the upper water intake head 1 is connected to the riser 2, specifically, Figure 1-Figure 4 As shown, the orthographic projection of the riser 2 in this embodiment may also be an octagonal structure. For example, the length of each side of the octagonal riser 2 is 2m-2.1m, and the height of the riser 2 may be 6m.

[0059] The upper water intake head 1 and the riser 2 are both octagonal structures, which have higher geometric stability than other geometric configurations, can better disperse water flow impact and ocean wave loads, effectively reduce deformation risks in complex marine environments, and extend the service life of the large pipeline water intake head.

[0060] The riser 2 is also designed to be an octagon, so that the riser 2 has clear edges and corners, which is conducive to accurate alignment during installation. Combined with the mortise and tenon connection design between the upper riser 21 and the lower riser 22 recorded later, the edge line of the octagon can further provide a visual guide reference, simplifying the docking operation of the riser 2 during the construction process, which is particularly suitable for the rapid installation needs in complex offshore environments.

[0061] A base 3 is provided at the bottom of the riser 2. Specifically, the base 3 can be provided as a rectangular structure with a side length of 10 m. The base 3 is used to support the upper structure. The concrete volume of a single large-scale pipeline water intake head in this embodiment is approximately 212.97 m 3 , weighing about 532.42t, it is large in size and heavy in weight.

[0062] like Figure 1 , Figure 4As shown, a through hole for communicating with the water intake pipeline 100 is opened on the side wall of the riser 2 , and the riser 2 is connected with the water intake pipeline 100 . In this embodiment, the riser 2 is used to transport seawater to the water intake pipeline 100 .

[0063] like Figure 1 , Figure 2 , Figure 4 As shown, in this embodiment, the riser 2 includes an upper riser 21 and a lower riser 22. The top of the upper riser 21 is fixedly connected to the upper water intake head 1, and the lower part of the lower riser 22 is fixedly connected to the base 3. The upper riser 21 and the lower riser 22 are connected by mortise and tenon joints. Figure 4 , Figure 5 For example, a tenon is provided at the bottom of the upper riser 21, and a mortise is provided at the top of the corresponding lower riser 22 (it can be understood that the positions of the tenon and the mortise can be interchanged), and the tenon of the upper riser 21 can be quickly inserted into the mortise of the lower riser 22 to achieve a quick connection between the upper riser 21 and the lower riser 22.

[0064] The large-scale pipeline water intake head provided in this embodiment overcomes the problems of large volume, heavy weight and difficulty in hoisting at sea of ​​the traditional integrated structure water intake head by dividing the riser 2 into an upper riser 21 and a lower riser 22. The upper water intake head 1 + upper riser 21 and the lower riser 22 + base 3 can be hoisted and transported separately and spliced ​​at the construction site. During the hoisting operation at sea, the load of the hoisting equipment is significantly reduced, which reduces the risk in the hoisting process, improves the safety of offshore construction, and significantly improves the construction efficiency.

[0065] The upper riser 21 and the lower riser 22 are designed with a mortise and tenon connection, which not only has a strong connection performance, but also provides a natural guiding function. When installing the upper riser 21 and the lower riser 22, the cooperation of the tenon and the mortise groove can achieve automatic alignment without the need for additional guiding tools or complicated adjustment steps. This not only speeds up the installation speed, but also reduces the operation requirements for technical workers, improves construction efficiency, and reduces the sealing problems or strength reduction that may be caused by docking deviation.

[0066] Example 2

[0067] like Figure 1-Figure 4 As shown, on the basis of Example 1, the large-scale pipeline water intake head provided in this embodiment further includes a chlorination pipe 4, which is located in the standpipe 2 and is used to add chlorine into the standpipe 2. Specifically, in this embodiment, the chlorination pipe 4 extends from both sides of the water intake pipeline 100 into the standpipe 2, and the chlorination pipe 4 forms an octagonal chlorination pipe system at the top of the standpipe 2. The octagonal chlorination pipe 4 at the top of the standpipe 2 is provided with a plurality of chlorine outlets 4 for discharging chlorine liquid into the standpipe 2.

[0068] The large-scale pipeline water intake head provided in this embodiment is prefabricated in two parts (upper water intake head 1+upper riser 21, lower riser 22+base 3). The chlorine addition pipe 4 inside the riser 2 is also divided into two parts, and the upper and lower parts of the chlorine addition pipe 4 are installed separately before the riser 2 is connected.

[0069] The upper and lower parts of the chlorine dosing pipe 4 are connected by a threaded sleeve. Before the connection, the pipe clamp in the connection area is loosened to allow the chlorine dosing pipe 4 to have some room for movement. Then the diver tightens the threaded sleeve at the connection to complete the connection of the chlorine dosing pipe 4. After the connection is completed, all the loosened pipe clamps are tightened to limit the chlorine dosing pipe 4.

[0070] The chlorination pipe 4 is used to inject chlorine gas or chloride solution into the riser 2, which can effectively reduce the accumulation of marine organisms and their metabolites in the screen 11, the riser 2 and the water intake pipe 100, avoid the local blockage caused by this, ensure the smooth circulation of seawater and the stability of water intake efficiency, protect downstream pipelines and equipment from biological fouling, reduce the burden of subsequent deep treatment, and improve the operational reliability of the entire system.

[0071] Example 3

[0072] This embodiment provides a water intake head installation method, which is used to install the large pipeline water intake head provided in Embodiment 1 or Embodiment 2, and includes the following steps:

[0073] S1: Prefabrication of water intake head in sections: integrally cast the upper water intake head 1 and the upper riser 21, integrally cast the lower riser 22 and the base 3, pre-embed the first bolt 5 and the second bolt 6 at the joint of the upper riser 21 and the lower riser 22, the first bolt 5 is pre-embedded in the lower riser 22, the second bolt 6 is pre-embedded in the upper riser 21. Specifically, at least two first bolts 5 can be pre-embedded in each surface of the lower riser 22, and correspondingly, at least two second bolts 6 can be pre-embedded in each surface of the upper riser 21. The first bolt 5 is used for fixing and connecting the subsequent beam support 7, and the second bolt 6 is used for fixing and connecting the subsequent template 8.

[0074] S2: Excavation and leveling of the base bed: Excavate the water head base bed to the designed height, use the upper barge of the long-arm excavator to dump stones, and carry out stone dumping on the base bed; use the guide rail scraper method to level the base bed. The guide rail scraper method sets a guide rail on the base bed and moves the scraper equipment on the guide rail to ensure that the scraper's running track is always at the designed height, effectively avoiding the base bed height error caused by manual operation or unstable equipment, improving the leveling accuracy, and laying the foundation for the stable installation of the water head base 3.

[0075] S3: Installation of water intake head on barge: After the prefabrication of the large-scale pipeline water intake head is completed, select a suitable window period and use a crane ship to lift the upper water intake head 1 and the upper riser 21, the lower riser 22 and the base 3 step by step and place them on the barge. Before lifting, the water area at the front end of the shipping channel is dredged to an elevation below -2.5m to meet the draft of the crane ship and the square barge. When lifting the lower riser 22 and the base 3, first evenly arrange four lifting rings on the base 3; when lifting the upper water intake head 1 and the upper riser 21, first evenly arrange four lifting rings on the top of the upper water intake head 1. After the large-scale pipeline water intake head is lifted, the barge is towed to the installation area.

[0076] S4: Installation of water intake head: Use a crane ship to first lift the lower riser 22 and the base 3. After the base 3 is installed in place and limited, lift the upper water intake head 1 and the upper riser 21. Divers go into the water to assist in the installation, so that the upper riser 21 and the lower riser 22 are connected by mortise and tenon joints, and the water intake pipe 100 is connected to the riser 2. It can be foreseen that the upper riser 21 and the lower riser 22 can reserve the installation hole position of the water intake pipe 100 in advance, and the water intake pipe 100 can be installed between the upper riser 21 and the lower riser 22.

[0077] S5: Figure 6 As shown, the water intake head is docked: the reserved steel bars are overlapped and tied at the joint of the upper riser 21 and the lower riser 22. The beam support 7 is fixedly connected to the lower riser 22 by the pre-buried first bolt 5, and the template 8 is installed on the top of the beam support 7. The top of the template 8 is connected to the second bolt 6 through the tie rod 9. After the template 8 is installed, the underwater concrete is poured. In this embodiment, the beam support 7 can specifically use the corbel commonly used in engineering construction, and the underwater concrete pouring uses non-shrinkage underwater grouting material.

[0078] S6: Backfilling: In this embodiment, backfilling is performed in layers to at least 1.5 m from the top of the water intake pipe 100. Specifically, the backfilling can be as follows: Figure 7 As shown, the first layer is backfill sand 101. In this embodiment, the backfill sand 101 can use pipeline foundation trench dredging materials. The first layer backfill range is from the base 3 to the top of the water intake pipeline 100. The second layer is facing stone 102. The second layer backfill range is from the first layer backfill sand 101 to the top of the water intake pipeline 100 for at least 1.5m.

[0079] In this embodiment, before backfilling, floats can be tied to the four lifting rings on the top plate of the upper water intake head 1, and the outer edge of the backfill can be marked to prevent the backfill from piling up on the top plate of the upper water intake head 1. The backfill of this embodiment can be loaded from a temporary wharf and transported to the backfill area by a small open barge for backfilling.

[0080] This embodiment can adopt the method of dumping and filling with an open barge. When dumping and filling, a positioning ship is used for positioning first, and the open barge is moored on the positioning ship for dumping and filling construction. When dumping and filling, water is frequently used to measure the elevation. If the dumped sand is too high, a sand pump is used to clear the high point. During the dumping and filling process, divers need to stay away from the dumping and filling area to avoid causing personal injury.

[0081] After the stone throwing of the face stone 102 is completed and accepted, the screen 11 is finally installed. During installation, the temporary blind plate installed on the upper water intake head 1 is first removed, and an air bag is connected to the screen 11 to be installed with a fixed-length sling, gradually approaching the docking port, and the diver connects the flange bolts of the screen 11 underwater.

[0082] The water intake head installation method provided in this embodiment prefabricates the water intake head into sections as an integrated structure of an upper water intake head 1 and an upper riser 21, and an integrated structure of a lower riser 22 and a base 3. Through the coordinated design of mortise and tenon connections and embedded bolts, the workload of on-site assembly is significantly simplified, the single unit weight of each module is reduced, the capacity requirements of lifting and transportation equipment are reduced, and the dependence on construction site conditions is reduced.

[0083] The embedded first bolt 5 and second bolt 6 provide a stable connection point for the installation of the beam support 7 and the template 8, ensuring that the underwater concrete poured at the joint of the upper riser 21 and the lower riser 22 is stable, effectively improving the structural strength and overall impact resistance of the joint of the upper and lower risers. The layered backfill method is adopted to at least 1.5m from the top of the water intake pipeline 100 to ensure the stability and anti-buoyancy ability of the pipeline and water intake head structure.

[0084] The water intake head installation method provided in this embodiment not only significantly simplifies the construction process and improves the construction efficiency, but also enhances the reliability and applicability of the structure through scientific and reasonable segmented prefabrication, modular assembly and efficient assembly design. It is particularly suitable for the installation requirements of water intake heads of large seawater cooling systems.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-scale pipeline water intake head, characterized in that: It comprises an upper water intake head (1), wherein the upper water intake head (1) is provided with a plurality of screens (11), and the screens (11) are used to filter seawater; The bottom of the upper water intake head (1) is connected to the standpipe (2), a base (3) is provided at the bottom of the standpipe (2), the standpipe (2) is connected to the water intake pipeline (100), and the standpipe (2) is used to transport seawater to the water intake pipeline (100); The riser (2) comprises an upper riser (21) and a lower riser (22); the top of the upper riser (21) is fixedly connected to the upper water intake head (1); the bottom of the lower riser (22) is fixedly connected to the base (3); and the upper riser (21) and the lower riser (22) are connected by mortise and tenon joints.

2. A large-scale pipeline water intake head according to claim 1, characterized in that: The upper water intake head (1) and the riser (2) are both octagonal structures.

3. A large-scale pipeline water intake head according to claim 2, characterized in that: The screen (11) is arranged on the eight sides of the upper water intake head (1).

4. A large-scale pipeline water intake head according to claim 1, characterized in that: The aperture of the screen (11) is 90 mm-110 mm.

5. A large-scale pipeline water intake head according to any one of claims 1 to 4, characterized in that: It also comprises a chlorine addition pipe (4), which is located in the standpipe (2) and is used to add chlorine into the standpipe (2).

6. A method for installing a water intake head, characterized in that: The method for installing the large-scale pipeline water intake head according to any one of claims 1 to 5 comprises the following steps: S1: Prefabrication of the water intake head in sections: integrally casting the upper water intake head (1) and the upper riser (21), integrally casting the lower riser (22) and the base (3), pre-embedding the first bolt (5) and the second bolt (6) at the joint between the upper riser (21) and the lower riser (22), the first bolt (5) being pre-embedded in the lower riser (22), and the second bolt (6) being pre-embedded in the upper riser (21); S2: Excavation and leveling of the subgrade: Excavate the water head subgrade to the designed height, and perform stone throwing and leveling of the subgrade; S3: Installing the water intake head on a barge: The upper water intake head (1), the upper riser (21), the lower riser (22) and the base (3) are hoisted step by step and placed on a barge, and then the barge is towed to the installation area; S4: Installation of the water intake head: The lower riser (22) and the base (3) are first lifted by a crane ship. After the base (3) is installed in place and limited, the upper water intake head (1) and the upper riser (21) are lifted, and a diver goes into the water to assist in the installation, so that the upper riser (21) and the lower riser (22) are connected by mortise and tenon joints; S5: water intake head docking: overlap and tie the steel bars at the joint of the upper riser (21) and the lower riser (22), fix the beam support (7) and the lower riser (22) with the pre-buried first bolt (5), install the template (8) on the top of the beam support (7), connect the top of the template (8) with the second bolt (6) through the tie rod (9), and pour underwater concrete; S6: Backfilling: Backfill in layers to at least 1.5 m from the top of the water intake pipe (100).

7. A water intake head installation method according to claim 6, characterized in that: At least two first bolts (5) are embedded in each surface of the lower vertical pipe (22) in S1.

8. A water intake head installation method according to claim 6, characterized in that: In S2, the guide rail scraper method is used to level the base bed.

9. A water intake head installation method according to claim 6, characterized in that: When lifting the lower riser (22) and the base (3) in S3, four lifting rings are first evenly arranged on the base (3); when lifting the upper water intake head (1) and the upper riser (21), four lifting rings are first evenly arranged on the top of the upper water intake head (1).

10. A water intake head installation method according to claim 6, characterized in that: When backfilling in layers is performed in S6, the first layer is backfill sand (101), and the range of the first layer backfill is from the base (3) to the top of the water intake pipe (100), and the second layer is facing stone (102), and the range of the second layer backfill is at least 1.5 m from the first layer backfill sand (101) to the top of the water intake pipe (100).

Images