Subsea large-diameter pipeline installation device and construction process thereof

Abstract

The application relates to a submarine large-diameter pipeline installation device and a construction process thereof, in particular to a submarine large-diameter pipeline installation device and a construction process thereof with a pipe diameter larger than DN1200. The device comprises a pipeline body, the two ends of the pipeline body are provided with an ellipsoidal flange, and the pipeline body is provided with an anti-sliding pipe shoe; the anti-sliding pipe shoe comprises a wave-shaped flat pipe shoe, an anti-rolling support and a fixing sleeve, the wave-shaped flat pipe shoe is symmetrically provided with double wave-shaped plates on the two sides, and the wave-shaped flat pipe shoe is provided with the anti-rolling support; the anti-rolling support is provided with the fixing sleeve matched with the pipeline body. The pipeline body is installed underwater in sections through the anti-sliding pipe shoe, the device can adapt to relatively complex sea conditions such as reciprocating flow, the requirement for the leveling of the submarine pipeline bed is reduced, the large-diameter pipeline with a diameter larger than DN1200 can be quickly installed, cost is saved, the operation is simple, and the construction is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine large-diameter pipeline installation, and in particular to a submarine large-diameter pipeline installation device with a diameter greater than DN1200 and a construction process thereof. Background Art

[0002] Currently, the installation of deep-sea, underwater oil and water pipelines primarily relies on specialized pipelay vessels, towing, or floating methods. However, the high cost of building pipelay vessels leads to high deployment and operating costs, making them unsuitable for smaller projects involving shorter pipelines. Furthermore, due to the limited flexibility of metal pipes, existing domestic pipelay vessels are only suitable for laying pipelines below DN1200 and are unsuitable for laying large-diameter steel pipes above DN1200. Because submarine pipeline installation areas experience reciprocating tidal currents with significant fluctuations in ebb and flow, and the subsurface currents are complex, the towing method is suitable for shallow water depths and favorable sea conditions. However, it also places certain demands on geological conditions and the quality of the pipe connections, making the pipe susceptible to damage during the towing process. Floating and towing pipelaying requires a gently sloping bank to ensure the pipeline enters the water, making it suitable for use in favorable sea conditions. However, it also requires temporary blocking of the pipeline, followed by lowering to the seabed or into a trench to remove the blocking plate, making the operation relatively cumbersome. Therefore, it is necessary to develop an installation device and a construction process thereof that can quickly install large-diameter pipelines above DN1200 under more complex sea conditions such as recurrent. Summary of the Invention

[0003] The present invention aims to provide a submarine large-diameter pipeline installation device and a construction process thereof, so as to adapt to relatively complex sea conditions such as reciprocating flow, reduce the leveling requirements for the submarine pipeline bed, quickly install large-diameter pipelines above DN1200, save costs, simplify operation, and facilitate construction.

[0004] The submarine large-diameter pipeline installation device provided by the present invention includes a pipeline body, wherein oval-hole flanges are provided at both ends of the pipeline body, and an anti-slip pipe transfer boot is provided on the pipeline body; the anti-slip pipe transfer boot includes a corrugated flat pipe boot, an anti-roll bracket and a fixed hoop, double corrugated plates are symmetrically provided on both sides of the corrugated flat pipe boot, and the anti-roll bracket is provided on the corrugated flat pipe boot; the anti-roll bracket is provided with a fixed hoop adapted to the pipeline body, and the anti-roll bracket is located above the double corrugated plates.

[0005] Furthermore, the anti-roll bracket includes a vertical rod and an oblique rod, the upper ends of the vertical rod and the oblique rod are connected together by a horizontal rod, the vertical rod is arranged on the outside of the double corrugated plate, the oblique rod is arranged on the inside of the double corrugated plate, and the oblique rod is in contact with the pipe body; a fixing hoop is provided on the horizontal rod.

[0006] Further, the crossbar is provided with bolt holes, and the fixing sleeve is welded with bolts, and the fixing sleeve is detachably connected with the crossbar through the bolts.

[0007] Further, the double corrugated plate comprises two symmetrically arranged first corrugated plate and second corrugated plate, and the first corrugated plate and the second corrugated plate are connected by a third corrugated plate.

[0008] Further, the pipeline body is further provided with a lifting nose in the middle, and the lifting nose is located between the two fixing sleeves of the anti-slip pipe shoe.

[0009] Further, the upper end of the elliptical hole flange is provided with a traction positioning nose, and the side of the elliptical hole flange is provided with a limiting support.

[0010] A submarine large-diameter pipeline installation construction process comprises the following steps:

[0011] Step 1, processing the pipeline body on land, and welding elliptical hole flanges at both ends of the pipeline body, and installing an anti-slip pipe shoe in the middle of the pipeline body;

[0012] Step 2, transporting the pipeline body, and transporting it to the installation location by barge;

[0013] Step 3, pipeline body installation, hoisting the pipeline body into the water, fixing the bolts through the elliptical hole flanges, connecting the multiple pipeline bodies together, and completing the installation of the submarine large-diameter pipeline.

[0014] Further, in step 1, first, the pipeline is processed in a flow line manner in the factory, which is made of steel metal material, and the finished pipeline is 12m long; then, after the pipeline is transported to the processing site, 3 pipelines are welded into a pipeline body, the welding needs to ensure that the axes of the 3 pipelines are coaxial and straight, and after the welding joint is detected to be qualified by ultrasonic non-destructive testing, corrosion protection painting is performed; then, the elliptical hole flanges are processed and manufactured in advance in the factory, and are transported to the processing site to be fully welded at both ends of the pipeline body; then, two lifting noses are symmetrically arranged along the two sides of the center of gravity of the pipeline body as hoisting points of the pipeline body, two traction positioning noses are arranged at the upper end of the elliptical hole flanges at both ends of the pipeline body as positioning traction points, the centers of all the lifting noses and traction positioning noses need to be on the same center line, and are welded perpendicularly to the axis of the pipeline body to ensure that hoisting does not produce deviation; finally, after the anti-slip pipe shoe is manufactured, corrosion protection paint is applied, two to multiple anti-slip pipe shoes are installed on each pipeline body, and are evenly distributed.

[0015] Further, in step 2, after each pipeline body is processed in the onshore prefabrication yard, it is hoisted to the front of the barge loading wharf by a caterpillar crane, and is placed symmetrically and evenly in the barge warehouse, and good reinforcement and protection measures are taken, and after the tide and ocean current conditions at the installation site meet the installation requirements, the barge is used to transport the pipeline body to the installation location.

[0016] Furthermore, in the step 3, first, the ship is positioned: the construction ship is positioned by GPS, and the ship is moved to the installation point by anchoring, so that the ship is parallel to the axis of the installation pipeline, and the outer side of the ship's side is close to the installation point, so as to facilitate the floating crane to lift the pipeline body for installation; then, the lifting preparation: each section of the pipeline body is installed in the form of two-point lifting, and a shackle and wire rope that meet the specifications are selected according to the weight of the pipeline body. The pipeline body lifting nose and one end of the wire rope are connected by the shackle, and the other end of the wire rope is hung on the hook head of the floating crane. The floating crane slowly lifts the hook until the wire rope is straightened by the force; the traction positioning noses at both ends are tied with cables in advance for the positioning of the pipeline body in the water; then, the pipeline body is positioned and installed: the floating crane lifts the hook to gradually leave the deck, and after moving the boom to the installation point, the hook head is slowly lowered to slowly enter the water. During the process By adjusting the positioning cables at both ends of the pipeline, the pipeline body is allowed to enter the water parallel to the ship's side. After the pipeline body enters the water close to the top surface of the leveled base bed, the diver enters the water to check the installation position of the pipeline body, and directs the floating crane to gradually adjust the position of the pipeline body through the limit brackets at both ends of the pipeline body. The anti-slip pipe transfer boots are slowly placed on the bed, and the pipeline body is docked through the elliptical hole flange. Finally, the pipeline body is connected: after the elliptical hole flange is tightly docked, the diver passes the fixing bolts through the elliptical screw holes on the elliptical hole flange to manually install and tighten the pipeline body. Then, use one end of the wrench to fix the nut and the other end to tighten the nut again. Double nuts are used to prevent it from falling off. The diver tightens all the fixing bolts evenly according to the above steps. After the installation of the pipeline body is completed, a float is installed at the tail end of the pipeline body as a mark to facilitate the next installation and positioning.

[0017] The submarine large-diameter pipeline installation device and construction process provided by the present invention have the following beneficial effects:

[0018] 1. Because there is an undercurrent underwater at the construction site, the pipeline body is equipped with an anti-slip pipe transfer boot, which can prevent the pipeline body from being displaced by the undercurrent.

[0019] 2. The anti-slip pipe boot includes a corrugated flat pipe boot, an anti-roll bracket and a fixed hoop. The corrugated flat pipe boot can increase the contact area between the bottom of the anti-slip pipe boot and the seabed; the anti-roll bracket and the fixed hoop can prevent the pipeline body from shaking in the corrugated flat pipe boot.

[0020] 3. Oval hole flanges are set at both ends of the pipe body. Fixing bolts are passed through the oval hole flanges to connect multiple sections of the pipe body together, which can be quickly installed underwater in sections.

[0021] 4. A lifting nose is set in the middle of the pipe body. The lifting nose serves as the lifting point of the pipe body, which can be quickly lifted, transported and installed.

[0022] Therefore, the application can quickly install large-diameter pipelines on water by positioning devices and special pipe shoes, has high flexibility in segmented underwater installation, can adapt to relatively complex sea conditions such as reciprocating flow, reduces the requirement for leveling of the seabed pipeline bed, quickly installs large-diameter pipelines with a diameter of more than DN1200, saves cost, is simple to operate, and is convenient to construct. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings disclose specific embodiments of the application, wherein,

[0024] Figure 1 is a structural schematic diagram of the application;

[0025] Figure 2 is a structural schematic diagram of the anti-slip pipe shoe of the application;

[0026] Figure 3 is a structural side view of the pipeline body and the anti-slip pipe shoe of the application;

[0027] Figure 4 is a use state diagram of the application;

[0028] The accompanying drawings disclose specific embodiments of the application, wherein, DETAILED DESCRIPTION

[0029] The application will be described in detail below in combination with the drawings and embodiments.

[0030] As Figures 1-3 shown, the submarine large-diameter pipeline installation device provided by the application includes a pipeline body 1, the two ends of the pipeline body 1 are provided with elliptical flanges 2, and the pipeline body 1 is provided with an anti-slip pipe shoe 3; the anti-slip pipe shoe 3 includes a wave-shaped flat pipe shoe 31, an anti-rolling support 32, and a fixed sleeve 33, the wave-shaped flat pipe shoe 31 is symmetrically provided with double corrugated plates 311 on both sides, and the wave-shaped flat pipe shoe 31 is provided with the anti-rolling support 32; the anti-rolling support 32 is provided with the fixed sleeve 33 matched with the pipeline body 1, and the anti-rolling support 32 is located above the double corrugated plates 311. Example 1

[0031] As Figure 4As shown, in use, first, the ell flange plate 2 is welded and installed at both ends of the pipe body 1 with a large pipe diameter of DN1200 or above on the installation site on land, the two anti-slip pipe shoes 3 are installed in the middle of the pipe body 1, the wave-shaped flat pipe shoe 31 is located at the bottom of the pipe body 1, the anti-rolling support 32 is located at the side of the bottom of the pipe body 1, and the fixing sleeve hoop 33 is wrapped around the pipe body 1. Then, the hoisting rope 5 is fixed on the pipe body 1, the pipe body 1 is lifted off the shore by the crane ship, and the crane ship is driven to the water area to be installed. Finally, after arriving at the installation water area, the pipe body 1 is put into water, the fixed bolts are used to pass through the ell flange plate 2, and the multiple pipe bodies 1 are connected together, so that the pipe body 1 with a large pipe diameter of DN1200 or above can be installed underwater in sections quickly, the cost is saved, the operation is simple, and the construction is convenient.

[0032] The anti-rolling support 32 includes a vertical rod 321 and an inclined rod 322, the upper ends of the vertical rod 321 and the inclined rod 322 are connected together by a horizontal rod 323, the vertical rod 321 is arranged outside the double corrugated plate 311, the inclined rod 322 is arranged inside the double corrugated plate 311, and the inclined rod 322 is in contact with the pipe body 1, and the anti-rolling support 32 is located above the double corrugated plate 311; the horizontal rod 323 is provided with the fixing sleeve hoop 33. In combination with structural and mechanical design, the anti-rolling support 32 can fix the pipe body 1 in the anti-slip pipe shoe 3, so that the pipe body 1 with a large pipe diameter of DN1200 or above can be installed underwater in sections quickly, the cost is saved, the operation is simple, and the construction is convenient.

[0033] The horizontal rod 323 is provided with a bolt hole, and the fixing sleeve hoop 33 is welded with a bolt, and the fixing sleeve hoop 33 is detachably connected with the horizontal rod 323 through the bolt. The fixing sleeve hoop 33 can be quickly installed on the horizontal rod 323 through the bolt, that is, the pipe body 1 is quickly installed in the anti-slip pipe shoe 3, so that the pipe body 1 with a large pipe diameter of DN1200 or above can be installed underwater in sections quickly, the cost is saved, the operation is simple, and the construction is convenient.

[0034] The double corrugated plate 311 includes two symmetrically arranged first corrugated plates 312 and second corrugated plates 313, the first corrugated plate 312 and the second corrugated plate 313 are connected by a third corrugated plate 314, and the upper end of the first corrugated plate 312 is in contact with the inner side of the inclined rod 322. In combination with structural and mechanical design, sufficient fixing force and supporting force are provided for the pipe body 1, and the pipe body 1 is conveniently installed quickly.

[0035] A lifting lug 4 is also provided in the middle of the pipe body 1, and is located between the two fixing ferrules 33 of the anti-slip pipe transfer shoe 3. A lifting rope 5 is fixed to the lifting lug 4, which facilitates the lifting and movement of the pipe body 1. This facilitates the rapid installation of large-diameter pipes over DN1200 in complex sea conditions such as reciprocating flow, saving costs, simplifying operation, and facilitating construction.

[0036] The upper end of the oval-hole flange 2 is equipped with a traction and positioning nose 21, and limit brackets 22 are installed on both sides of the oval-hole flange 2. The lifting rope 5 is fixed to the traction and positioning nose 21, facilitating the lifting and movement of the pipe body 1. The limit brackets 22 can quickly position the two installed pipe bodies 1 together, facilitating the rapid installation of large-diameter pipes (DN1200 and above) in complex sea conditions such as reciprocating flow, saving costs, simplifying operation, and facilitating construction. Example 2:

[0037] A submarine large-diameter pipeline installation construction process comprises the following steps:

[0038] Step 1: Process the pipeline body 1 onshore, weld elliptical flanges 2 at both ends of the pipeline body 1, and install an anti-slip pipe boot 3 in the middle of the pipeline body 1;

[0039] Step 2: transport the pipeline body 1 to the transportation and installation location by barge;

[0040] Step 3: Install the pipeline body 1. Hoist the pipeline body 1 into the water, pass the fixing bolts through the oval-hole flange 2, and connect the multiple sections of the pipeline body 1 together to complete the installation of the submarine large-diameter pipeline. Example 3:

[0041] A submarine large-diameter pipeline installation construction process comprises the following steps:

[0042] Step 1, land processing pipeline body 1: first, the pipeline is processed in a factory in a pipeline manner, which is made of steel metal material, and the finished pipeline has a length of 12 m; then, after the pipeline is transported to the processing site, three pipelines are welded into a section of the pipeline body 1, the welding needs to ensure that the three pipeline axes are coaxial and straight, after the welding opening is detected by ultrasonic non-destructive testing, the corrosion repair painting is performed; then, the ellipsoidal flange 2 is processed in advance in the factory, and is welded to the two ends of the pipeline body 1 by full welding after being transported to the processing site; then, two hanging noses 4 are symmetrically arranged along the two sides of the center of gravity of the pipeline body 1 as the hoisting points of the pipeline body 1, two traction positioning noses 21 are arranged on the upper end of the ellipsoidal flange 2 at the two ends of the pipeline body 1 as the positioning traction points, the centers of all the hanging noses 4 and the traction positioning noses 21 need to be on the same center line, and are welded perpendicularly to the axis of the pipeline body 1, so as to ensure that the hoisting does not produce deviation; finally, after the anti-slip pipe shoes 3 are completed, the anti-corrosion paint is brushed, two to more anti-slip pipe shoes 3 are installed on each section of the pipeline body 1, and are uniformly distributed;

[0043] Step 2, transporting the pipeline body 1: after each section of the pipeline body 1 is processed in the land prefabrication yard, it is hoisted by a caterpillar crane and loaded on a barge wharf, the pipeline body 1 is symmetrically and uniformly placed in the barge warehouse, and good reinforcement and protection measures are taken, after the tide and current conditions of the installation site meet the installation requirements, the barge is transported to the installation position;

[0044] Step 3, pipeline body 1 installation: first, the ship positioning: through the GPS positioning construction ship anchor moves the ship position to the installation point, makes the ship parallel to the installation pipeline axis, the ship side is adjacent to the installation point, so as to facilitate the floating crane lifting pipeline body 1 installation is appropriate; Then, hoisting preparation: each section of pipeline body 1 installation adopts two point hoisting form, according to the weight of pipeline body 1 selects the corresponding specification of shackle and wire rope, through the shackle connection pipeline body 1 lifting lug and one end of the wire rope, the other end of the wire rope is hung on the floating crane hook, the floating crane slowly hooks until the wire rope is straight in tension; The two end traction positioning nose 21 is tied with a cable in advance, which is used for positioning of pipeline body 1 launching; Then, pipeline body 1 positioning installation: the floating crane hooks make the pipeline body 1 gradually leave the deck, the moving arm is moved to the installation point, and the hook head is slowly lowered to make the pipeline body 1 slowly enter the water, the pipeline body 1 is parallel to the ship side in the process of entering the water through the adjustment of the positioning cable at both ends of the pipeline, and the pipeline body 1 enters the water close to the completed base top surface, then the diver enters the water to check the installation position of the pipeline body 1, the floating crane is adjusted through the limiting support 22 at both ends of the pipeline body 1 to adjust the position of the pipeline body 1, the anti-skid pipe shoe 3 slowly beds, and the pipeline body 1 is connected through the elliptical flange plate 2; If there is a large gap between the elliptical flange plate (2), the hook is slowly lowered and the lifting wire rope is loosened, which is fixed on the hook traction positioning nose at the end of the pipeline, and the pipeline is slowly pulled close by using the floating crane; Finally, pipeline body 1 connection: after the elliptical flange plate 2 is connected closely, the diver passes the elliptical screw hole in the elliptical flange plate 2 through the fixing bolt to preliminarily install and fasten the pipeline body 1 manually, then one end of the wrench is fixed with the nut, and the other end is fastened with the nut again, which adopts the form of double nuts to prevent falling off, and the diver fastens all the fixing bolts uniformly according to the above steps; After the installation of the pipeline body 1 is completed, the floating buoy is installed at the tail end of the pipeline body 1 to mark, so as to facilitate the next installation and positioning.

Claims

1. A submarine large-diameter pipeline installation device, comprising a pipeline body (1), characterized in that: The pipe body (1) is provided with oval flanges (2) at both ends, and an anti-slip pipe boot (3) is provided on the pipe body (1); the anti-slip pipe boot (3) includes a corrugated flat pipe boot (31), an anti-roll bracket (32) and a fixed hoop (33), and double corrugated plates (311) are symmetrically provided on both sides of the corrugated flat pipe boot (31), and an anti-roll bracket (32) is provided on the corrugated flat pipe boot (31); a fixed hoop (33) adapted to the pipe body (1) is provided on the anti-roll bracket (32), and the anti-roll bracket (32) is located above the double corrugated plates (311); the anti-roll bracket (32) includes a vertical rod (321) and an oblique rod (322), and the upper ends of the vertical rod (321) and the oblique rod (322) are connected together by a horizontal rod (323) The vertical rod (321) is arranged on the outside of the double corrugated plate (311), the oblique rod (322) is arranged on the inside of the double corrugated plate (311), and the oblique rod (322) is in contact with the pipe body (1); the cross bar (323) is provided with a fixing hoop (33); the double corrugated plate (311) includes two symmetrically arranged first corrugated plates (312) and second corrugated plates (313), the first corrugated plates (312) and the second corrugated plates (313) are connected by a third corrugated plate (314), and the upper end of the first corrugated plate (312) is in contact with the inner side of the oblique rod (322); the cross bar (323) is provided with a bolt hole, the fixing hoop (33) is welded with a bolt, and the fixing hoop (33) and the cross bar (323) are detachably connected by the bolt.

2. The submarine large-diameter pipeline installation device according to claim 1 is characterized in that: A hanging nose (4) is also provided in the middle of the pipe body (1), and the hanging nose (4) is located between two fixed hoops (33) of the anti-slip pipe boot (3).

3. The submarine large-diameter pipeline installation device according to claim 1 is characterized in that: A traction positioning nose (21) is provided at the upper end of the oval-hole flange (2), and a limiting bracket (22) is provided on the side of the oval-hole flange (2).

4. The construction process of the submarine large-diameter pipeline installation device according to any one of claims 1 to 3 is characterized in that: The following steps are involved: Step 1: Process the pipeline body (1) on land, weld elliptical flanges (2) at both ends of the pipeline body (1), and install an anti-slip pipe boot (3) in the middle of the pipeline body (1); Step 2: transport the pipeline body (1) by barge to the transportation and installation location; Step 3, installation of the pipeline body (1), hoisting the pipeline body (1) into the water, passing the fixing bolts through the oval hole flange (2), connecting the multiple sections of the pipeline body (1) together, and completing the installation of the submarine large diameter pipeline.

5. The construction process of the submarine large-diameter pipeline installation device according to claim 4 is characterized in that: In the step 1, first, the pipeline is processed in a factory in an assembly line manner. The pipeline is made of steel metal, and the length of a single finished pipeline is 12m. Then, after the pipeline is transported to the processing site, the three pipelines are welded into a section to form a pipeline body (1). The welding must ensure that the axes of the three pipelines are coaxial and straight. After the weld passes the ultrasonic non-destructive testing, it is subjected to anti-corrosion paint. After that, the elliptical hole flange (2) is processed and manufactured in advance in the factory and transported to the processing site. It is welded to both ends of the pipeline body (1) by full welding. Then, along both sides of the center of gravity of the pipeline body (1), the flange (2) is welded to the two ends of the pipeline body (1). Two lifting noses (4) are symmetrically arranged as the lifting points of the pipeline body (1), and two traction positioning noses (21) are arranged on the upper ends of the flange oval hole flanges (2) at both ends of the pipeline body (1) as positioning traction points. The centers of all the lifting noses (4) and the traction positioning noses (21) need to be on the same center line and welded perpendicularly to the axis of the pipeline body (1) to ensure that the lifting does not cause deviation; finally, after the anti-slip pipe boots (3) are manufactured, they are painted with anti-corrosion paint, and two to more anti-slip pipe boots (3) are installed on each section of the pipeline body (1) and are evenly distributed.

6. The construction process of the submarine large-diameter pipeline installation device according to claim 4 is characterized in that: In step 2, after each section of the pipeline body (1) is processed in the onshore prefabrication yard, it is lifted to the front of the barge dock by a crawler crane for loading onto the ship. The pipeline body (1) is symmetrically and evenly placed in the barge hold, and reinforcement and protection measures are taken. After the tide and ocean current conditions at the installation site meet the installation requirements, it is transported to the installation location by barge.

7. The construction process of the submarine large-diameter pipeline installation device according to claim 4 is characterized in that: In the step 3, first, the ship is positioned: the construction ship is anchored and moved to the installation point by GPS positioning, so that the ship is parallel to the axis of the installation pipeline and the outer side of the ship is close to the installation point, so as to facilitate the floating crane to lift the pipeline body (1) for installation; then, the lifting preparation is carried out: each section of the pipeline body (1) is installed in the form of two-point lifting, and a shackle and a wire rope that meet the specifications are selected according to the weight of the pipeline body (1), and the pipeline body (1) lifting nose and one end of the wire rope are connected by the shackle, and the other end of the wire rope is hung on the hook head of the floating crane, and the floating crane slowly lifts the hook until the wire rope is straightened by the force; the traction positioning noses (21) at both ends are tied with cables in advance for the positioning of the pipeline body (1) when it is launched into the water; then, the pipeline body (1) is positioned and installed: the floating crane lifts the hook to make the pipeline body (1) gradually leave the deck, and after moving the boom to the installation point, the hook head is slowly lowered to make the pipeline body (1) slowly enter the water, and the positioning of the two ends of the pipeline is adjusted during the process. The cable makes the pipe body (1) enter the water parallel to the ship's side. After the pipe body (1) enters the water close to the top surface of the leveled base bed, the diver enters the water to check the installation position of the pipe body (1), directs the floating crane to gradually adjust the position of the pipe body (1) through the limit brackets (22) at both ends of the pipe body (1), and the anti-slip pipe boot (3) slowly lands, and the pipe body (1) is docked through the oval hole flange (2); finally, the pipe body (1) is connected: after the oval hole flange (2) is tightly docked, the diver passes the fixing bolt through the oval screw hole on the oval hole flange (2) to manually install and tighten the pipe body (1), and then fix the nut with one end of the wrench and tighten the nut again with the other end, using the double nut form to prevent it from falling off. The diver follows the above steps to evenly tighten all the fixing bolts; after the installation of the pipe body (1) is completed, a float is installed at the tail end of the pipe body (1) as a mark to facilitate the next installation and positioning.

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