Method for laying a sewer under the sea

Abstract

The application discloses a kind of construction methods of submarine drainage pipeline, including initial section underwater section pipeline laying in the foundation trench of seabed;Lifting the butt joint end of initial section underwater section pipeline, install vertical limiting device at the butt joint end of initial section underwater section pipeline;Underwater section pipeline to be installed sinks under the limiting effect of vertical limiting device;Bundling alignment adjustment steel wire rope, so that the flange of initial section underwater section pipeline butt joint end and the flange of underwater section pipeline to be installed butt joint end are attached;Initial section underwater section pipeline and underwater section pipeline to be installed sink.This application adjusts the horizontal distance of the butt joint end of underwater section pipeline to be installed and the butt joint end of initial section underwater section pipeline before underwater section pipeline butt joint, then through a pair of alignment adjustment steel wire rope, so that the flange of two butt joint pipelines are attached, the attachment degree of two butt joint flanges is high, there is almost no gap at flange bottom end, and main stress point is on ballast block, reduce flange stress, play the role of protecting flange.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine water intake and drainage pipeline construction. More particularly, the present application relates to a construction method of submarine water intake and drainage pipeline. BACKGROUND

[0002] Submarine water intake and drainage pipeline is mainly used to introduce seawater into power plants, oil refineries and other facilities for cooling, firefighting and seawater desalination, and to discharge wastewater into the deep sea. Submarine water intake and drainage pipeline is divided into submarine water intake pipeline and submarine drainage pipeline. The submarine water intake pipeline provides cooling water for the cooling system of the power plant or oil refinery from the submarine water intake. The submarine drainage pipeline discharges wastewater generated by the power plant or oil refinery into the deep sea. Submarine water intake and drainage pipeline generally needs to be introduced into the deep sea, and the total length of the pipeline laid is as long as several kilometers, which is connected by multiple HDPE pipelines, each of which is as long as several hundred meters. With the progress of technology and the increasing demand for water supply and drainage capacity of submarine water intake and drainage pipeline, the demand for the diameter of the pipeline in this technical field is gradually increasing. Currently, there are successful cases of laying HDPE pipelines with an inner diameter of 3 meters in China. For laying long-distance and large-diameter water intake and drainage pipelines, a tugboat is generally used to tow the pipeline to the predetermined location, and then the pipeline is suspended into the sea. The pipeline is connected at the submarine, and when the pipeline is connected, the crawler crane on the construction ship and the steel wire rope are used in cooperation to pull the two pipelines to be connected close together. When the horizontal distance between the connecting ends of the two pipelines is 1-2m, the steel wire rope or the hand-operated hoist is tied at the connecting ends of the two pipelines for position adjustment, and the connecting ends of the two pipelines are made to fit by pulling the steel wire rope or the hand-operated hoist.

[0003] In Chinese patent "CN107166092B, a pipeline underwater connection method", a steel wire rope is used to pass through the connecting ends of two pipelines to be connected, and the connecting ends of the two pipelines to be connected are made to fit by pulling the steel wire rope. It is necessary to tie the position adjustment steel wire rope on the flanges of the connecting ends of the two pipelines to be connected. For long-distance and large-diameter pipeline connection, the pulling force of the steel wire rope is insufficient, and tying the position adjustment steel wire rope on the flanges is easy to damage the flanges. After connection, the top ends of the two flanges are easy to fit tightly, and the bottom ends have gaps, which requires divers to make secondary hole position adjustment. SUMMARY

[0004] The present application provides a construction method of submarine water intake and drainage pipeline. Before the connection of the two pipelines, the horizontal distance between the two pipelines is adjusted, and then a vertical limiting device with a large upper part and a small lower part is used to limit the connection of the pipelines, so that the cross sections of the connecting ends of the two pipelines gradually coincide, achieving the purpose of reducing the vertical and horizontal distance of the connecting ends of the two pipelines. The flanges of the connecting ends of the two pipelines are made to fit by tying the position adjustment steel wire rope, and the tying method of the position adjustment steel wire rope can improve the fitting degree of the flanges of the connecting ends and is not easy to damage the flanges.

[0005] To achieve these objects and other advantages and in accordance with the purpose of the application, as embodied and broadly described herein, there is provided a method for constructing an underwater outfall pipeline, the outfall pipeline comprising a submerged section and a land section, the land section being connected to an outlet end of a stilling basin downstream of a power plant or a cooling system or an inlet end of a cooling system, the installation of the submerged section comprising the steps of:

[0006] S1: opening the air valve and the water valve of the initial submerged section, the initial submerged section is filled with water and sunk, the initial submerged section is tied with air bags, the length of the lifting belt of the air bags is adjusted to control the sinking depth of the initial submerged section, the initial submerged section is sunk to be laid in a foundation trench, the left and right directions of the butt joint end of the initial submerged section are tied with fixed length cables, the other ends of the fixed length cables are tied to concrete blocks sunk on the bottom surface of the seabed, the air valve and the water valve of the to-be-installed submerged section are opened, the to-be-installed submerged section is suspended under the suspension of the air bags, is filled with water and sunk to be suspended at a vertical distance of 5-10 m and a horizontal projection distance of 1-2 m from the butt joint end of the initial submerged section, the initial submerged section and the to-be-installed submerged section are both provided with ballast blocks, and the initial submerged section and the to-be-installed submerged section are sunk under the action of their own gravity and the gravity of the ballast blocks;

[0007] S2: lifting the butt joint end of the initial submerged section to be 1.5-2 m away from the bottom surface of the foundation trench under the weight reduction effect of the reserved air bags, installing a vertical limiting device with a large upper part and a small lower part at the lower part of the butt joint end of the initial submerged section, and lowering the bottom of the butt joint end of the initial submerged section to be attached to one side of the bottom plate of the vertical limiting device;

[0008] S3: continuing to fill the to-be-installed submerged section with water and sink it under the suspension of the air bags, adjusting the butt joint end of the to-be-installed submerged section to enter the converging section of the vertical limiting device, gradually sinking the butt joint end of the to-be-installed submerged section under the limitation of the multiple converging sections of the vertical limiting device, until the butt joint end of the to-be-installed submerged section is attached to one side of the bottom plate of the vertical limiting device, at which time the butt joint end of the to-be-installed submerged section is flush with the butt joint end of the initial submerged section;

[0009] S4: tying a pair of alignment adjustment steel wires to the butt joint end of the to-be-installed submerged section and the butt joint end of the initial submerged section, connecting the pair of alignment adjustment steel wires to the lifting rings of two sets of lifting machines, pulling the pair of alignment adjustment steel wires by the two sets of lifting rings, attaching the screw holes on the flanges of the butt joint end of the initial submerged section and the butt joint end of the to-be-installed submerged section, and quickly inserting 8 temporary positioning screws into the screw holes of the two flanges;

[0010] S5: unloading the vertical limiting device, releasing the air bags, sinking the initial submerged section and the to-be-installed submerged section to the foundation trench, inserting screws into the screw holes of the two flanges, and replacing the temporary positioning screws;

[0011] S6: repeating the above steps S1-S5, sequentially sinking, docking and connecting the multiple-section underwater section pipeline to form a pipeline.

[0012] S7: the multiple-section underwater section pipeline extends into the seabed, the underwater section pipeline and the land section pipeline are linearly arranged, the underwater section pipeline and the land section pipeline are docked and connected under the suspension of the winch, and the land section pipeline and the underwater section pipeline are connected to form a water intake and drainage pipeline inclined into the sea.

[0013] Preferably, the insertion sequence of the temporary positioning screw rod is first inserting the first sequence screw hole and then inserting the second sequence screw hole.

[0014] Preferably, the underwater section pipeline is provided with multiple ballast blocks.

[0015] Preferably, the ballast block corresponding to the docking end of the underwater section pipeline is provided with a hole, and the hole and the screw hole on the flange corresponding thereto one-to-one correspond.

[0016] Preferably, the vertical limiting device comprises a bottom plate, multiple pairs of limiting plates and support legs, the multiple pairs of limiting plates are vertically connected in sequence to form multiple layers of converging sections with diameters gradually decreasing from top to bottom, one pair of limiting plates in the lowest layer is connected with the bottom plate, the limiting plates are Z-shaped, the limiting plates comprise vertical plates, upper horizontal plates and lower horizontal plates, the upper horizontal plates are provided with first sockets, the lower horizontal plates of the limiting plates in the upper layer are inserted into the first sockets of the limiting plates in the lower layer and clamped by clamps, the two side edges of the bottom plate are provided with second sockets, the lower horizontal plates of the limiting plates in the lowest layer are inserted into the second sockets, the lower horizontal plates of the limiting plates in the lowest layer are clamped by clamps at the connection with the bottom plate, the lower part of the bottom plate is provided with support legs, the bottom of the support legs is provided with a counterweight, the lower edge of the bottom plate is provided with a connecting plate, the connecting plate is provided with a limiting hole, and the height of the vertical plate of the limiting plates in the lowest layer is lower than the radius of the underwater section pipeline.

[0017] Preferably, the vertical limiting device is installed at the lower part of the docking end of the initial section underwater section pipeline, the pipeline between the flange of the docking end of the initial section underwater section pipeline and the ballast block of the docking end of the initial section underwater section pipeline enters the bottom plate of the vertical limiting device and is attached to the bottom plate, and one limiting rod sequentially passes through the limiting holes on the vertical limiting device and the holes in the ballast block of the docking end of the initial section underwater section pipeline, and the part of the docking end of the underwater section pipeline to be installed entering the vertical limiting device is the pipeline between the flange of the docking end of the underwater section pipeline to be installed and the ballast block of the docking end of the underwater section pipeline to be installed.

[0018] Preferably, the process of gradually sinking the butt joint end of the to-be-installed underwater section pipeline in the multi-layered folding section of the vertical limiting device is as follows: the butt joint end of the to-be-installed underwater section pipeline first enters the uppermost limiting plate, continues to sink into the second limiting plate from top to bottom, the uppermost limiting plate is disassembled, when the butt joint end of the to-be-installed underwater section pipeline enters the third limiting plate from top to bottom, the second limiting plate is disassembled, and until the butt joint end of the to-be-installed underwater section pipeline is attached to the bottom plate, at this time, the butt joint end of the to-be-installed underwater section pipeline is flush with the butt joint end of the initial underwater section pipeline.

[0019] Preferably, the binding mode of the pair of alignment adjustment steel wire ropes is as follows: one alignment adjustment steel wire rope is sequentially threaded through the first hole on the ballast block of the butt joint end of the to-be-installed underwater section pipeline, the first screw hole on the flange of the butt joint end of the to-be-installed underwater section pipeline, the third screw hole on the flange of the butt joint end of the initial underwater section pipeline, and the third hole on the ballast block of the butt joint end of the initial underwater section pipeline, and the other alignment adjustment steel wire rope is sequentially threaded through the second hole on the ballast block of the butt joint end of the to-be-installed underwater section pipeline, the second screw hole on the flange of the butt joint end of the to-be-installed underwater section pipeline, the fourth screw hole on the flange of the butt joint end of the initial underwater section pipeline, and the fourth hole on the ballast block of the butt joint end of the initial underwater section pipeline, wherein the first hole, the second hole, the third hole and the fourth hole are holes at the vertical midpoint of the corresponding ballast block, and the first screw hole, the second screw hole, the third screw hole and the fourth screw hole are screw holes at the vertical midpoint of the corresponding flange.

[0020] Preferably, the transportation of each pipeline on land is completed by a plurality of carts, the plurality of carts are sequentially connected to form a large cart, angle irons are arranged around the large cart, the inside of the large cart is divided into a plurality of grids, each grid is filled with foam, wood boards are laid on the foam, and the pipelines to be transported are placed on the wood boards.

[0021] The present application at least includes the following beneficial effects:

[0022] First, the application makes the docking end of the initial underwater section pipeline and the docking end of the to-be-installed underwater section pipeline enter the limiting range of the vertical limiting device before the docking of the underwater section pipelines, that is, the horizontal distance between the docking end of the to-be-installed underwater section pipeline and the docking end of the initial underwater section pipeline is adjusted first, at this time, the horizontal distance between the docking ends of the two section pipelines is 60-80 cm, then the sinking of the to-be-installed underwater section pipeline is carried out, the docking end of the to-be-installed underwater section pipeline sinks in the vertical limiting device, because the upper part of the vertical limiting device is larger than the lower part, the cross sections of the docking end of the to-be-installed underwater section pipeline and the docking end of the initial underwater section pipeline gradually coincide, then a pair of alignment adjusting steel wires are pulled together to make the flanges of the docking ends of the two section pipelines fit together, the two flanges are bound at the vertical one-half screw holes of the flanges, the fitting degree of the two flanges is high, and there is almost no gap at the bottom end of the flanges, and when the pair of alignment adjusting steel wires are pulled together, the main stress point is on the ballast block, the stress on the flanges is reduced, and the flanges are protected.

[0023] Second, the vertical limiting device of the application is convenient to disassemble and easy to operate.

[0024] Third, the application carries out pipeline sinking by binding air bags on the underwater section pipelines and controlling the water depth of the underwater section pipelines by adjusting the length of the lifting belts of the air bags, compared with the hand-operated hoist or steel wire sinking pipeline, the air bags have better stability after entering the water, and the deflation operation is convenient.

[0025] Other advantages, objects and features of the application will be partly embodied through the following description, and will be partly understood by those skilled in the art through research and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The structure schematic view of the initial underwater section pipeline and the to-be-installed underwater section pipeline described in the application;

[0027] Figure 2 The structure schematic view of the initial underwater section pipeline and the to-be-installed underwater section pipeline described in the application;

[0028] Figure 3 The structure schematic view of the initial underwater section pipeline and the to-be-installed underwater section pipeline described in the application;

[0029] Figure 4 The structure schematic view of the initial underwater section pipeline and the to-be-installed underwater section pipeline described in the application;

[0030] Figure 5 The structure schematic view of the initial underwater section pipeline and the to-be-installed underwater section pipeline described in the application;

[0031] Figure 6Structure diagram of the limiting plate according to the present application;

[0032] Figure 7 Structure diagram of the lower horizontal plate of the limiting plate in the upper layer inserted into the first insertion hole in the lower layer according to the present application;

[0033] Figure 8 Structure diagram of the limiting plate in the lowest layer and the bottom plate according to the present application;

[0034] Figure 9 Structure diagram of the connecting plate according to the present application;

[0035] Figure 10 Structure diagram of the binding of the alignment adjusting steel wire rope according to the present application;

[0036] Figure 11 Structure diagram of the first hole, the second hole, the third hole, the fourth hole, the first screw hole, the second screw hole, the third screw hole, and the fourth screw hole according to the present application;

[0037] Figure 12 Structure diagram of the position of the butt joint end of the underwater section pipeline to be installed and the vertical limiting plate during the descending process according to the present application;

[0038] Figure 13 Structure diagram of the position of the first screw hole, the second screw hole, the third screw hole, and the fourth screw hole according to the present application;

[0039] Figure 14 Structure diagram of the position of the first sequential screw hole and the second sequential screw hole according to the present application;

[0040] Figure 15 Structure diagram of the binding of the alignment adjusting steel wire rope at the vertical one-half hole position of the flange and the ballast block according to the present application. DETAILED DESCRIPTION

[0041] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the description and drawings.

[0042] It should be understood that the terms such as "have", "contain", and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0043] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials mentioned are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] This invention pertains to the construction of water intake and drainage pipelines in a certain water intake and drainage project, such as... Figures 1-4 As shown in Figures 10-12 and 15, this invention provides a construction method for an underwater intake and drainage pipeline. The intake and drainage pipeline includes an underwater section and an onshore section. The onshore section is connected to the outlet of an energy dissipation pool located downstream of a power plant or oil refinery, or the inlet of a cooling system. The construction of the underwater section includes the following steps:

[0045] S1: Open the air valve and water valve of the initial underwater section pipe 1, fill the initial underwater section pipe 1 with water and sink it. Secure the initial underwater section pipe 1 with airbags 5. Control the sinking depth of the initial underwater section pipe 1 by adjusting the length of the slings 6 of the airbags 5. The initial underwater section pipe 1 sinks to the level of the foundation trench. Tie fixed-length cables 7 to the left and right sides of the docking end of the initial underwater section pipe 1. The other end of the fixed-length cables 7 is tied to the concrete block 8 placed on the seabed. Open the air valve and water valve of the underwater section 2 to be installed. Under the suspension of the airbag 5, the underwater section 2 to be installed is filled with water and sinks to a position where its docking end is 5-10m vertically and 1-2m horizontally projected from the docking end of the initial underwater section 1. Ballast blocks 3 are set on both the initial underwater section 1 and the underwater section 2 to be installed. The initial underwater section 1 and the underwater section 2 to be installed sink under their own weight and the weight of the ballast blocks 3.

[0046] S2: Under the weight reduction effect of the reserved airbag 51, the docking end of the initial underwater section pipe 1 is raised to 1.5-2m away from the bottom of the trench. A vertical limiting device 12 with a larger upper part and a smaller lower part is installed at the lower part of the docking end of the initial underwater section pipe 1. The bottom of the docking end of the initial underwater section pipe 1 is lowered to fit against the bottom plate 14 of the vertical limiting device 12.

[0047] S3: The underwater pipeline 2 to be installed continues to sink under the suspension of the air bag 5, and the butt joint end of the underwater pipeline 2 to be installed is adjusted to enter the folding section of the vertical limiting device 12. The butt joint end of the underwater pipeline 2 to be installed gradually sinks under the limitation of the multi-layer folding section of the vertical limiting device 12, until the butt joint end of the underwater pipeline 2 to be installed is attached to one side of the bottom plate 14 of the vertical limiting device 12, at which time the butt joint end of the underwater pipeline 2 to be installed is flush with the butt joint end of the initial section underwater pipeline 1;

[0048] S4: A pair of alignment adjustment steel wire ropes 9 are tied around the butt joint ends of the underwater pipeline 2 to be installed and the initial section underwater pipeline 1. The pair of alignment adjustment steel wire ropes 9 are respectively connected with the lifting rings of the two sets of cranes, and the two sets of lifting rings pull the pair of alignment adjustment steel wire ropes 9. The screw holes on the flanges 4 of the butt joint ends of the initial section underwater pipeline 1 and the underwater pipeline 2 to be installed are attached, and 8 temporary positioning screw rods are quickly inserted into the screw holes of the two flanges 4;

[0049] S5: The vertical limiting device 12 is unloaded, the air bag 5 is released, and the initial section underwater pipeline 1 and the underwater pipeline 2 to be installed are sunk into the foundation trench. The screw rods are inserted into the screw holes of the two flanges 4, and the temporary positioning screw rods are replaced;

[0050] S6: The above steps S1-S5 are repeated, and multiple section underwater pipelines are sequentially sunk and butt jointed, so that the multiple section underwater pipelines are connected and formed and laid in the foundation trench;

[0051] S7: The multiple section underwater pipelines extend into the seabed, and the underwater pipelines and the land section pipelines are linearly arranged. The underwater pipelines and the land section pipelines are butt jointed and connected under the suspension of the winch, and the land section pipelines and the underwater pipelines are connected to form the water intake and drainage pipeline inclined into the sea.

[0052] In the above technical solution, the underwater water and drainage pipeline is divided into an underwater water pipeline and an underwater drainage pipeline, the onshore section of the underwater water pipeline is connected with the inlet end of the cooling system of the power plant or the oil refinery, and the underwater section of the underwater water pipeline extends into the seabed; the onshore section of the underwater drainage pipeline is connected with the outlet end of the energy dissipation pool downstream of the power plant or the oil refinery, and the underwater section of the underwater drainage pipeline extends into the seabed. The laying of the underwater water and drainage pipeline is divided into onshore transportation, marine towing and pipeline sinking, and underwater pipeline butt joint. The underwater water pipeline or the underwater drainage pipeline comprises a plurality of sections of underwater section and onshore section, the sections of the underwater section are butt jointed through flanges 4, blind plates are installed on the flanges 4, air valves and water valves are arranged on the blind plates, and the blind plates on the flanges 4 are removed before the pipeline butt joint. Before the underwater section pipeline is laid, the ballast blocks 3 are installed on the pipeline, the air bags 5 are tied on the ballast blocks 3, the blind plates are installed on the flanges 4, the air valves and the water valves on the blind plates are closed, and it is ensured that the blind plates and the pipeline as a whole are in a sealed state. The construction window period of the underwater water and drainage pipeline is that the wind is less than 6 and the wave height is not more than 0.5 m.

[0053] First step: The initial section of the underwater section pipeline 1 is laid in the foundation trench of the seabed, and the to-be-installed underwater section pipeline 2 is sunk into position. The operation of laying the initial section of the underwater section pipeline 1 in the foundation trench of the seabed is as follows: The initial section of the underwater section pipeline 1 is transported from the land to the sea side by a trolley, the initial section of the underwater section pipeline 1 is inclined into the sea under the suspension of a winch, a tugboat tows the initial section of the underwater section pipeline 1 to float on the sea above the foundation trench, the air valve at the butt joint end of the initial section of the underwater section pipeline 1 and the water valve at the non-butt joint end are opened, the initial section of the underwater section pipeline 1 is sunk by water under the gravity of the initial section of the underwater section pipeline 1 and the ballast blocks 3, the air bags 5 are provided with length-adjustable lifting belts 6, the lifting belts 6 are connected with a construction ship, the depth of the initial section of the underwater section pipeline 1 is controlled by adjusting the length of the lifting belts 6, and the initial section of the underwater section pipeline 1 is sunk until the initial section of the underwater section pipeline 1 is sunk to the foundation trench. A fixed-length cable 7 is tied to the left and right directions of the butt joint end of the initial section of the underwater section pipeline 1, and the other end of the fixed-length cable 7 is tied to a concrete block 8 sunk on the seabed. The operation of sinking the to-be-installed underwater section pipeline 2 into position is as follows: The to-be-installed underwater section pipeline 2 is transported from the land to the sea side by a trolley, the air valve at the butt joint end of the to-be-installed underwater section pipeline 2 and the water valve at the non-butt joint end are opened, the to-be-installed underwater section pipeline 2 is sunk by water under the gravity of the to-be-installed underwater section pipeline 2 and the ballast blocks 3, the horizontal projection distance between the butt joint end of the to-be-installed underwater section pipeline 2 and the butt joint end of the initial section of the underwater section pipeline 1 is controlled by a caterpillar crane and a steel wire rope on the construction ship, and the to-be-installed underwater section pipeline 2 is suspended at a vertical distance of 5-10 m from the butt joint end of the initial section of the underwater section pipeline 1 by the lifting belts 6, so as to prepare for the pipeline butt joint.

[0054] The two ends of the initial underwater section pipeline 1 or the underwater section pipeline 2 to be installed are divided into butt joint ends and non-butt joint ends. When the initial underwater section pipeline 1 or the underwater section pipeline 2 to be installed is filled with water and sinks, the water valve and the air valve on the same blind plate cannot be opened, so that air bubbles do not appear in the middle of the pipeline and the overall sinking of the pipeline cannot be completed as expected. The fixed length cable 7 has a certain length, and the concrete block 8 is used to limit the left and right movement of the butt joint end of the initial underwater section pipeline 1 during butt joint. When the pipeline sinks, the pipeline is placed by adjusting the length of the lifting belt 6 of the air bag 5 to control the depth of the pipeline into the water, instead of the traditional operation of sinking the pipeline by using a hand-operated hoist. Because the air bag 5 is stable after entering the water, it is convenient to deflate, while the hand-operated hoist is inconvenient to control and difficult to operate. After the underwater section pipeline 2 to be installed is filled with water and sinks, the vertical distance between the butt joint end of the underwater section pipeline 2 to be installed and the butt joint end of the initial underwater section pipeline 1 is controlled to be 5-10 m, and the horizontal projection distance is 1-2 m. In order to avoid the collision between the two underwater section pipelines during the interval time between two operation windows, and to reserve the working space for the removal of the blind plate and the installation of the vertical limiting device 12 in the next operation window.

[0055] Second step: lifting the butt joint end of the initial underwater section pipeline 1, removing the blind plate of the butt joint end of the initial underwater section pipeline 1, and installing the vertical limiting device 12 at the butt joint end of the initial underwater section pipeline 1. A reserved air bag 51 is arranged at the butt joint end of each underwater section pipeline. The reserved air bag 51 is inflated to lift the butt joint end of the initial underwater section pipeline 1 to 1.5-2 m away from the bottom surface of the foundation groove under the weight reduction effect of the reserved air bag 51. A vertical limiting device 12 with a large upper part and a small lower part is installed at the lower part of the butt joint end of the initial underwater section pipeline 1. The vertical limiting device 12 includes a bottom plate 14, multiple pairs of limiting plates 15 and supporting legs 13. The vertical limiting device 12 is inserted into the lower part of the butt joint end of the initial underwater section pipeline 1, so that the pipeline between the flange 4 of the butt joint end of the initial underwater section pipeline 1 and the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 enters the vertical limiting device 12, and the pipeline between the flange 4 of the butt joint end of the initial underwater section pipeline 1 and the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 is attached to one side of the bottom plate 14 of the vertical limiting device 12. A limiting rod 21 passes through the limiting hole 201 on the vertical limiting device 12 and the hole in the bottom of the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 in sequence. The butt joint end of the initial underwater section pipeline 1 is connected to the concrete block 8 through the fixed length cable 7, and the concrete block 8 limits the horizontal movement of the butt joint end of the initial underwater section pipeline 1.

[0056] Third step: the to-be-installed underwater section pipeline 2 sinks under the restriction of the vertical limiting device 12. The horizontal distance between the flange 4 of the to-be-installed underwater section pipeline 2 and the to-be-installed underwater section pipeline 2 is adjusted by the caterpillar crane and the steel wire rope, the projection of the pipeline between the flange 4 of the to-be-installed underwater section pipeline 2 and the ballast block 3 of the to-be-installed underwater section pipeline 2 enters the vertical limiting device 12, the length of the sling 6 is adjusted, the to-be-installed underwater section pipeline 2 continues to sink, until the to-be-installed underwater section pipeline 2 enters the converging section of the vertical limiting device 12, the to-be-installed underwater section pipeline 2 gradually sinks under the restriction of the multiple converging sections of the vertical limiting device 12, the sinking process is as follows: the to-be-installed underwater section pipeline 2 enters the uppermost limiting plate 16 first, continues to sink into the second limiting plate 17 from top to bottom, when the to-be-installed underwater section pipeline 2 enters the second limiting plate 17 from top to bottom, the uppermost limiting plate 16 is removed, when the to-be-installed underwater section pipeline 2 enters the third limiting plate 18 from top to bottom, the second limiting plate 17 is removed, until the to-be-installed underwater section pipeline 2 is attached to one side of the bottom plate 14, at this time, the to-be-installed underwater section pipeline 2 is flush with the to-be-installed underwater section pipeline 1.

[0057] Fourth step: the alignment adjustment steel wire rope 9 is bound, so that the flange 4 of the to-be-installed underwater section pipeline 1 and the flange 4 of the to-be-installed underwater section pipeline 2 are attached. The binding method of the alignment adjustment steel wire rope 9 is as follows: one alignment adjustment steel wire rope 9 passes through the first hole 23 on the ballast block 3 of the to-be-installed underwater section pipeline 2, the first screw hole 27 on the flange 4 of the to-be-installed underwater section pipeline 2, the third screw hole 29 on the flange 4 of the to-be-installed underwater section pipeline 1, the third hole 25 on the ballast block 3 of the to-be-installed underwater section pipeline 1 in turn, and the other alignment adjustment steel wire rope 9 passes through the second hole 24 on the ballast block 3 of the to-be-installed underwater section pipeline 2, the second screw hole 28 on the flange 4 of the to-be-installed underwater section pipeline 2, the fourth screw hole 30 on the flange 4 of the to-be-installed underwater section pipeline 1, and the fourth hole 26 on the ballast block 3 of the to-be-installed underwater section pipeline 1 in turn. One pair of alignment adjustment steel wire ropes 9 are connected with the lifting rings of two sets of cranes respectively, the two sets of lifting rings cooperate to pull one pair of alignment adjustment steel wire ropes 9, so that the flange 4 of the to-be-installed underwater section pipeline 1 and the flange 4 of the to-be-installed underwater section pipeline 2 are attached, during the pulling of one pair of alignment adjustment steel wire ropes 9, the diver needs to cooperate to adjust the to-be-installed underwater section pipeline 1 and the to-be-installed underwater section pipeline 2, so that the screw holes on the two flanges are aligned one by one. Eight temporary positioning screw rods are quickly inserted into the screw holes of the two flanges 4, so that the flange 4 of the to-be-installed underwater section pipeline 1 and the flange 4 of the to-be-installed underwater section pipeline 2 are preliminarily fixed. The insertion order of the temporary positioning screw rods is: first, the first order screw hole 10 is inserted, and then the second order screw hole 11 is inserted.

[0058] Fifth step: the initial section of the underwater pipeline 1 and the underwater pipeline 2 to be installed are sunk. The limiting rod 21 is unloaded, the connection between the limiting plate 19 of the lowest layer and the bottom plate 14 is unloaded, the bottom plate 14 is pulled out from the butt joint end of the initial section of the underwater pipeline 1 and the butt joint end of the underwater pipeline 2 to be installed, the initial section of the underwater pipeline 1 is adjusted, the underwater pipeline 2 to be installed is adjusted, the initial section of the underwater pipeline 1 is sunk, the underwater pipeline 2 to be installed is sunk, the screw rod is inserted into the screw hole of the two flanges 4, and the temporary positioning screw rod is replaced. After 24 hours, the screw rod is fastened again.

[0059] Sixth step: the underwater pipeline is provided with multiple sections, and the operations of the first step to the fifth step are repeated to sink and butt joint the multiple sections of the underwater pipeline in sequence, so that the multiple sections of the underwater pipeline are connected and formed and laid in the foundation trench.

[0060] Seventh step: the multiple sections of the underwater pipeline are connected and extended into the seabed in sequence, the underwater pipeline and the onshore pipeline are linearly arranged, the underwater pipeline and the onshore pipeline are butt jointed and connected to form the water intake and drainage pipeline inclined into the sea under the suspension of the winch, the water intake and drainage pipeline has a total length of 2.5 kilometers and extends into the seabed by 20 meters.

[0061] In another technical solution, as shown in Figure 14 the insertion sequence of the temporary positioning screw rod is to insert the first sequence screw hole 10 first and then insert the second sequence screw hole 11. The two flanges 4 are fixed by the temporary positioning screw rod to prevent the flanges 4 of the two pipelines that have been successfully butt jointed from being separated or misaligned. The first sequence screw hole 10 needs to be offset from the first screw hole 27, the second screw hole 28, the third screw hole 29 and the fourth screw hole 30.

[0062] In another technical solution, multiple ballast blocks 3 are arranged on the underwater pipeline. The ballast block 3 is a concrete ballast block, which is used to increase the weight of the pipeline and the stability of the pipeline in the seabed. The ballast block 3 plays a role of anti-floating when the pipeline is sunk. The ballast block 3 is used to bind the lifting belt 6, the lifting belt 6 of the air bag 5, the fixed length cable 7 and the like.

[0063] In another technical solution, as shown in Figure 10As shown, the butt joint end of the underwater section pipeline is provided with a hole on the corresponding ballast block 3, and the hole and the screw hole on the corresponding flange 4 are one-to-one corresponding. The butt joint end of the underwater section pipeline is provided with a hole on the ballast block 3, and the hole and the screw hole on the flange 4 of the butt joint end of the underwater section pipeline are one-to-one corresponding, for binding the alignment steel wire rope 9 when the two sections of pipelines are butt jointed, avoiding damaging the flange 4 by directly binding the alignment steel wire rope 9 on the screw hole of the flange 4.

[0064] In another technical solution, as Figures 5-9As shown, the vertical limiting device 12 comprises a bottom plate 14, multiple pairs of limiting plates 15 and support legs 13. The multiple pairs of limiting plates 15 are connected vertically in sequence to form multiple layers of converging sections with diameters gradually decreasing from top to bottom. A pair of limiting plates 19 located at the lowest layer is connected with the bottom plate 14. The limiting plates 15 are Z-shaped, and each limiting plate 15 comprises a vertical plate 151, an upper horizontal plate 152 and a lower horizontal plate 153. The upper horizontal plate 152 is provided with a first socket 154. The lower horizontal plate 153 of the limiting plate 15 located at the upper layer is inserted into the first socket 154 of the limiting plate 15 located at the lower layer, and clamped by a clamp 22. The two side edges of the bottom plate 14 are provided with second sockets 141. The lower horizontal plate 153 of the pair of limiting plates 19 located at the lowest layer is inserted into the second sockets 141. The lower horizontal plate 153 of the pair of limiting plates 19 located at the lowest layer is clamped by the clamp 22 at the connection with the bottom plate 14. The lower part of the bottom plate 14 is provided with the support legs 13. The bottom of the support legs 13 is provided with a counterweight. The lower edge of the bottom plate 14 is provided with a connecting plate 20. The connecting plate 20 is provided with limiting holes 201. The height of the vertical plate 151 of the pair of limiting plates 19 located at the lowest layer is lower than the radius of the underwater section pipeline. The counterweight at the bottom of the support legs 13 enables the vertical limiting device 12 to be fixed on the seabed. The pair of limiting plates 19 located at the lowest layer is detachably connected with the bottom plate 14. The two side edges of the bottom plate 14 are provided with second sockets 141. A pair of lower horizontal plates 153 of the pair of limiting plates 19 located at the lowest layer are inserted into the second sockets 141. The lower horizontal plates 153 and the second sockets 141 are clamped by the clamp 22. Adjacent two limiting plates 15 are detachably connected. The upper horizontal plate 152 is provided with a first socket 154. The lower horizontal plate 153 of the limiting plate 15 located at the upper layer is inserted into the first socket 154 of the limiting plate 15 located at the lower layer. The lower horizontal plate 153 and the first socket 154 are clamped by the clamp 22. The bottom plate 14 is connected with multiple pairs of limiting plates 15 from bottom to top. The diameter of the limiting plate 15 located at the upper layer is larger than that of the limiting plate 15 located at the lower layer, forming multiple layers of converging sections with diameters gradually decreasing from top to bottom. During the process of gradually inserting the butt joint end of the underwater section pipeline 2 to be installed into the vertical limiting device 12, the diameter of the limiting plate 15 gradually decreases, so that the cross section of the butt joint end of the underwater section pipeline 2 to be installed gradually coincides with that of the underwater section pipeline already installed. When the butt joint end of the underwater section pipeline 2 to be installed is attached to the bottom plate 14, the height of the butt joint end of the underwater section pipeline 2 to be installed is flush with that of the underwater section pipeline already installed, and the horizontal distance is 60-80 cm. The connecting plate 20 is ∟-shaped and detachably connected with the bottom plate 14. The bottom plate 14 is provided with multiple connecting screw holes for connecting with the connecting plate 20. The connecting plate 20 and the bottom plate 14 are fixed by screws at the connection.

[0065] In another technical solution, as Figures 3-4As shown, the vertical limiting device 12 is installed at the lower part of the butt joint end of the initial underwater section pipeline 1, the flange 4 of the butt joint end of the initial underwater section pipeline 1 to the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 enters the bottom plate 14 of the vertical limiting device 12 and is attached to the bottom plate 14, and a limiting rod 21 passes through the limiting hole 201 on the vertical limiting device 12 and the hole on the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 in sequence. The part of the butt joint end of the underwater section pipeline 2 to be installed that enters the vertical limiting device 12 is the pipeline between the flange 4 of the butt joint end of the underwater section pipeline 2 to be installed and the ballast block 3 of the butt joint end of the underwater section pipeline 2 to be installed. Wherein the butt joint end of the initial underwater section pipeline 1 is attached to the bottom plate 14 of the vertical limiting device 12, the gravity of the butt joint end of the initial underwater section pipeline 1 cannot be ballasted on the bottom plate 14, and the butt joint end of the initial underwater section pipeline 1 is still carried by the reserved air bag 51. After the underwater section pipeline 2 to be installed is sunk to the point where the butt joint end is attached to the bottom plate 14 of the vertical limiting device 12, the gravity of the butt joint end of the underwater section pipeline 2 to be installed cannot be ballasted on the bottom plate 14 either. Wherein the limiting rod 21 temporarily fixes the butt joint end of the initial underwater section pipeline 1 and the vertical limiting device 12.

[0066] In another technical solution, as shown in the figure, Figure 12 the gradual sinking process of the butt joint end of the underwater section pipeline 2 to be installed in the multi-layered folding section of the vertical limiting device 12 is as follows: the butt joint end of the underwater section pipeline 2 to be installed first enters the uppermost limiting plate 16, continues to sink into the second limiting plate 17 from top to bottom, and the uppermost limiting plate 16 is removed. When the butt joint end of the underwater section pipeline 2 to be installed enters the third limiting plate 18 from top to bottom, the second limiting plate 17 is removed, and the butt joint end of the underwater section pipeline 2 to be installed is attached to one side of the bottom plate 14, at which point the butt joint end of the underwater section pipeline 2 to be installed is flush with the butt joint end of the initial underwater section pipeline 1. Under the control of the sling 6, the underwater section pipeline 2 to be installed gradually sinks, and when the butt joint end of the underwater section pipeline 2 to be installed sinks into the second limiting plate 17 from top to bottom, the uppermost limiting plate 16 is removed, and the butt joint end of the underwater section pipeline 2 to be installed is attached to one side of the bottom plate 14, but the butt joint end of the underwater section pipeline 2 to be installed is not ballasted on the bottom plate 14, and the butt joint end of the underwater section pipeline 2 to be installed is supported by the air bag 5.

[0067] In another technical solution, as shown in the figure, Figure 11As shown, the binding mode of the pair of alignment adjustment steel wires 9 is that one alignment adjustment steel wire 9 passes through the first hole 23 on the ballast block 3 of the butt joint end of the to-be-installed underwater section pipeline 2, the first screw hole 27 on the flange 4 of the butt joint end of the to-be-installed underwater section pipeline 2, the third screw hole 29 on the flange 4 of the butt joint end of the initial underwater section pipeline 1, the third hole 25 on the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 in sequence, and the other alignment adjustment steel wire 9 passes through the second hole 24 on the ballast block 3 of the butt joint end of the to-be-installed underwater section pipeline 2, the second screw hole 28 on the flange 4 of the butt joint end of the to-be-installed underwater section pipeline 2, the fourth screw hole 30 on the flange 4 of the butt joint end of the initial underwater section pipeline 1, the fourth hole 26 on the ballast block 3 of the butt joint end of the initial underwater section pipeline 1 in sequence, wherein the first hole 23, the second hole 24, the third hole 25 and the fourth hole 26 are the holes at the vertical half of the corresponding ballast block 3, and the first screw hole 27, the second screw hole 28, the third screw hole 29 and the fourth screw hole 30 are the screw holes at the vertical half of the corresponding flange 4. The pair of alignment adjustment steel wires 9 are bound at the screw holes at the vertical half of the two butt joint flanges 4, the butt joint degree of the two butt joint flanges 4 is high, and there is almost no gap at the bottom end of the flange 4, and when the pair of alignment adjustment steel wires 9 are pulled together, the main stress point is on the ballast block 3, the stress on the flange 4 is reduced, and the flange 4 is protected.

[0068] In another technical solution, the transportation of each section of pipeline on land is completed by a plurality of carts, the plurality of carts are connected in turn to form a large cart, angle irons are arranged around the large cart, the inside of the large cart is divided into a plurality of grids, each grid is filled with foam, a wooden board is laid on the foam, and the pipeline to be transported is placed on the wooden board. Since each section of pipeline is hundreds of meters long, the form of a plurality of carts connected to form a large cart is adopted to complete the on-land transportation of the pipeline, and the carts are connected alternately in the form of having wheels and not having wheels, thereby reducing the on-land transportation cost.

[0069] The number of devices and the scale of processing described here are used to simplify the description of the present application. Applications, modifications and variations of the present application that are obvious to those skilled in the art are apparent.

[0070] Although the embodiments of the present application have been disclosed as above, they are not limited to the applications and embodiments listed in the specification, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A method of construction of a submarine sewer, said sewer comprising a subaqueous section and a terrestrial section, the terrestrial section being connected to the outlet end of a stilling basin located downstream of a power plant, oil refinery, or to the inlet end of a cooling system, characterized in that, The installation of the underwater section pipeline comprises the following steps: S1: open the air valve and water valve of the initial section underwater section pipeline, fill water and sink the initial section underwater section pipeline, bind the air bag of the initial section underwater section pipeline, control the sinking depth of the initial section underwater section pipeline by adjusting the length of the sling of the air bag, sink the initial section underwater section pipeline to the laying groove, tie the fixed length cable of the left and right directions of the butt joint end of the initial section underwater section pipeline, tie the other end of the fixed length cable to the concrete block sunk on the seabed surface, open the air valve and water valve of the underwater section pipeline to be installed, suspend the underwater section pipeline to be installed under the suspension of the air bag, fill water and sink to the position of 5-10 m vertical distance and 1-2 m horizontal projection distance from the butt joint end of the initial section underwater section pipeline, set the ballast block on the initial section underwater section pipeline and the underwater section pipeline to be installed, and sink the initial section underwater section pipeline and the underwater section pipeline to be installed under the gravity of the self weight and the gravity of the ballast block; S2: lift the butt joint end of the initial section underwater section pipeline to 1.5-2 m from the bottom surface of the laying groove under the weight reduction effect of the reserved air bag, install a vertical limiting device with large upper part and small lower part at the lower part of the butt joint end of the initial section underwater section pipeline, and lower the bottom of the butt joint end of the initial section underwater section pipeline to adhere to one side of the bottom plate of the vertical limiting device; S3: continue to fill water and sink the underwater section pipeline to be installed under the suspension of the air bag, adjust the butt joint end of the underwater section pipeline to be installed to enter the converging section of the vertical limiting device, gradually sink the butt joint end of the underwater section pipeline to be installed under the limitation of the multiple converging sections of the vertical limiting device, until the butt joint end of the underwater section pipeline to be installed adheres to one side of the bottom plate of the vertical limiting device, at this time, the butt joint end of the underwater section pipeline to be installed is flush with the butt joint end of the initial section underwater section pipeline; S4: bind a pair of alignment adjustment steel wire ropes at the butt joint end of the underwater section pipeline to be installed and the butt joint end of the initial section underwater section pipeline, connect the pair of alignment adjustment steel wire ropes with the lifting rings of two sets of lifting machines respectively, pull the pair of alignment adjustment steel wire ropes by the two sets of lifting rings, adhere the screw holes on the flanges of the butt joint end of the initial section underwater section pipeline and the butt joint end of the underwater section pipeline to be installed, and quickly insert 8 temporary positioning screw rods into the screw holes of the two flanges; S5: unload the vertical limiting device, release the air bag, sink the initial section underwater section pipeline and the underwater section pipeline to be installed to the laying groove, insert the screw rods into the screw holes of the two flanges, and replace the temporary positioning screw rods; S6: repeat the above steps S1-S5, sequentially sink and butt joint multiple section underwater section pipelines, and connect the multiple section underwater section pipelines to form and lay in the laying groove; S7: extend the multiple section underwater section pipelines into the seabed, linearly arrange the underwater section pipeline and the land section pipeline, and butt joint the land section pipeline and the underwater section pipeline under the suspension of the winch to form the water intake and drainage pipeline inclined into the sea. The vertical limiting device comprises a bottom plate, multiple pairs of limiting plates and support legs, the multiple pairs of limiting plates are connected vertically and sequentially to form multiple layers of converging sections with diameters gradually decreasing from top to bottom, one pair of limiting plates at the lowest layer is connected with the bottom plate, the limiting plates are Z-shaped, the limiting plates comprise vertical plates, upper horizontal plates and lower horizontal plates, the upper horizontal plates are provided with first sockets, the lower horizontal plates of the limiting plates at the upper layer are inserted into the first sockets of the limiting plates at the lower layer and clamped by clamps, the two side edges of the bottom plate are provided with second sockets, the lower horizontal plates of the limiting plates at the lowest layer are inserted into the second sockets, the lower horizontal plates of the limiting plates at the lowest layer are clamped by clamps at the connecting positions with the bottom plate, the lower part of the bottom plate is provided with the support legs, the bottom of the support legs is provided with counterweights, the lower edge of the bottom plate is provided with a connecting plate, the connecting plate is provided with limiting holes, and the vertical plates of the limiting plates at the lowest layer are lower than the radius of the underwater section pipeline.

2. The method of installing an underwater sewer pipeline according to claim 1, wherein, The insertion sequence of the temporary positioning screw rod is to insert the first sequence screw hole first and then insert the second sequence screw hole.

3. The method of submarine sewer construction according to claim 1, wherein The underwater section pipeline is provided with multiple ballast blocks.

4. The method of submarine sewer construction according to claim 3, wherein Holes are arranged on the ballast blocks corresponding to the butt joint end of the underwater section pipeline, and the holes and the screw holes on the flanges corresponding to the holes one-to-one correspond.

5. The method of submarine sewer construction according to claim 4, wherein, The vertical limiting device is installed at the lower part of the butt joint end of the initial section underwater section pipeline, the pipeline between the flange of the butt joint end of the initial section underwater section pipeline and the ballast block of the butt joint end of the initial section underwater section pipeline enters the bottom plate of the vertical limiting device and is attached to the bottom plate, one limiting rod sequentially passes through the limiting holes on the vertical limiting device and the holes on the ballast block of the butt joint end of the initial section underwater section pipeline, and the part of the butt joint end of the underwater section pipeline to be installed entering the vertical limiting device is the pipeline between the flange of the butt joint end of the underwater section pipeline to be installed and the ballast block of the butt joint end of the underwater section pipeline to be installed.

6. The method of submarine sewer construction according to claim 4, wherein The process of the butt joint end of the underwater section pipeline to be installed gradually sinking in the multiple layers of converging sections of the vertical limiting device is that the butt joint end of the underwater section pipeline to be installed first enters the uppermost layer of limiting plates, continues to sink into the second layer of limiting plates from top to bottom, the uppermost layer of limiting plates is disassembled, the butt joint end of the underwater section pipeline to be installed enters the third layer of limiting plates from top to bottom, the second layer of limiting plates is disassembled, and finally the butt joint end of the underwater section pipeline to be installed is attached to the bottom plate, at which time the butt joint end of the underwater section pipeline to be installed is flush with the butt joint end of the initial section underwater section pipeline.

7. The method of submarine sewer construction according to claim 4, wherein The binding mode of the alignment adjusting steel wire ropes is as follows: one alignment adjusting steel wire rope is sequentially threaded through the first hole on the ballast block of the butt joint end of the to-be-installed underwater section pipeline, the first screw hole on the flange of the butt joint end of the to-be-installed underwater section pipeline, the third screw hole on the flange of the butt joint end of the initial underwater section pipeline, and the third hole on the ballast block of the butt joint end of the initial underwater section pipeline, and the other alignment adjusting steel wire rope is sequentially threaded through the second hole on the ballast block of the butt joint end of the to-be-installed underwater section pipeline, the second screw hole on the flange of the butt joint end of the to-be-installed underwater section pipeline, the fourth screw hole on the flange of the butt joint end of the initial underwater section pipeline, and the fourth hole on the ballast block of the butt joint end of the initial underwater section pipeline, wherein the first hole, the second hole, the third hole and the fourth hole are holes at the vertical midpoint of the corresponding ballast block, and the first screw hole, the second screw hole, the third screw hole and the fourth screw hole are screw holes at the vertical midpoint of the corresponding flange.

8. The method of submarine sewer construction according to claim 1, wherein, The transportation of each section of pipeline on land is completed by a plurality of carts, the plurality of carts are sequentially connected to form a large cart, angle irons are arranged around the large cart, the inside of the large cart is divided into a plurality of cells, each cell is filled with foam, a wooden board is arranged on the foam, and the pipeline to be transported is placed on the wooden board.

Images