Underwater pipeline connecting device and connecting method

Abstract

The invention relates to the technical field of underwater pipeline construction, and discloses an underwater pipeline connecting device and a connecting method.The device comprises a Haff connector, a positioning hole penetrating through a lower body is formed in the lower body, a hoisting blind hole is formed in an upper body, opposite connecting parts are formed at the two ends of the lower body and the two ends of the upper body, and bolt holes are formed in the connecting parts; a first through hole opposite to the hoisting blind hole is formed in the middle of the carrying pole beam, and second through holes opposite to the bolt holes are formed in the two ends of the carrying pole beam; the upper part of the hoisting piece is a hoisting part which can be connected with hoisting equipment, and the lower part of the hoisting piece is a threaded rod which penetrates through the first through hole and is in threaded connection with the hoisting blind hole; the first guide rod and the second guide rod are respectively arranged in the second through hole and the bolt hole; and the two limiting pieces are arranged on the first guide rod and the second guide rod in a sleeving mode correspondingly, and clamping grooves capable of being clamped to the connecting parts are formed in the lower ends of the limiting pieces. Adjacent underwater pipelines can be accurately, rapidly and safely installed and connected together through the device.

Description

Technical Field

[0001] This invention relates to the field of underwater pipeline construction technology, specifically to an underwater pipeline connection device and connection method. Background Technology

[0002] In underwater construction of large-diameter pipelines, half-joints are typically used to securely connect adjacent pipe sections. The traditional method involves first submerging the lower half of the half-joint to its designed position on the seabed, then submerging the pipe section along with it to align with the lower half of the half-joint. After leveling, another section of pipe is submerged for further adjustments, and then the upper half of the half-joint is lowered, finally securing the connection with bolts.

[0003] However, due to low visibility during underwater construction, numerous passing vessels, and the influence of factors such as water currents, velocities, and tides, divers find it difficult to precisely control the sinking speed and position of the lower half of the split joint. Even if the lower half of the split joint is positioned, the precision required for its connection with the large-diameter pipes at both ends remains a challenge. In subsequent operations, the difficulty in accurately locating the connection point between the upper and lower parts of the split joint results in low efficiency and a long construction period for underwater pipe installation, further increasing the potential safety hazards to divers' health. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an underwater pipeline connection device and method, aiming to accurately, quickly, and safely connect adjacent underwater pipelines together.

[0005] According to one embodiment of the present invention, an underwater pipeline connection device is provided, comprising: a split joint, a lower body having a positioning hole penetrating the body, an upper body having a lifting blind hole, the lower body and the upper body having opposing connecting portions at both ends, and bolt holes being formed on the connecting portions; a spreader beam having a first through hole in the middle opposing the lifting blind hole, and second through holes at both ends opposing the bolt holes; a lifting member having a lifting portion at the upper part that can be connected to a lifting device, and a threaded rod at the lower part that passes through the first through hole and is threadedly connected to the lifting blind hole; a first guide rod and a second guide rod, respectively disposed in the second through hole and the bolt holes; and two limiting members, respectively sleeved on the first guide rod and the second guide rod, the lower end of the limiting member having a groove that can be locked in the connecting portion.

[0006] As one embodiment, the lower body is provided with a plurality of positioning holes evenly distributed thereon.

[0007] As one implementation, the positioning hole is a countersunk hole capable of accommodating a positioning bolt.

[0008] In one embodiment, the lifting part is a lifting ring or a lifting hook.

[0009] In one embodiment, the upper ends of the first guide rod and the second guide rod are provided with limiting rings, the diameter of which is larger than the diameter of the second through hole.

[0010] In one implementation, the distance from the lower end of the first guide rod to the spreader beam is different from the distance from the lower end of the second guide rod to the spreader beam.

[0011] As one embodiment, the longitudinal section of the limiting member is H-shaped, and both the upper and lower ends of the limiting member are formed with slots that can be engaged with the connecting part.

[0012] According to one embodiment of the present invention, an underwater pipe connection method is provided, employing the underwater pipe connection device as described above, comprising the following steps: S1, drilling a positioning blind hole at the end of the pipe to be installed, the depth of the positioning blind hole not exceeding half the wall thickness of the pipe, and tapping an internal thread in the positioning blind hole; S2, fitting the lower body of the half-joint onto the end of the pipe, threading the front end of the positioning bolt through the positioning hole into the positioning blind hole, fixing the lower body of the half-joint onto the end of the pipe, and hoisting several sections of the pipe to a preset underwater position for docking; S3, threading the threaded rod of the lower part of the hoisting component through the first through hole of the spreader beam and threading it into the hoisting blind hole of the upper body of the half-joint, fitting two limiting members onto the first guide rod and the second guide rod respectively, and engaging the slots on the connection part, and then connecting the first... S4. Insert the first guide rod and the second guide rod into the second through hole and the bolt hole of the upper body, respectively; S5. Connect the lifting part of the lifting component to the lifting equipment, and lower the spreader beam, the upper body, the first guide rod and the second guide rod into the water as a whole, so that the first guide rod and the second guide rod are inserted into the bolt hole of the lower body, respectively; S6. Lower the upper body of the half-joint, so that the slot of the limiting member is engaged on the connecting part of the lower body, connect the upper body and the lower body of the half-joint together, unscrew the threaded rod from the lifting blind hole, and install a limiting bolt with a diameter larger than the inner diameter of the first through hole at the lower end of the threaded rod, lift the spreader beam, the first guide rod and the second guide rod, and tighten the remaining bolts of the half-joint into place; S7. Repeat steps S3 to S5 until all the half-joints on the pipes are installed.

[0013] In one implementation, in steps S3 to S6, the middle half-joint is installed first, and then the remaining half-joints are installed on the left and right sides.

[0014] As one implementation method, before hoisting several sections of the pipeline to the preset underwater position, the flatness of the underwater pipeline trench is re-measured, and uneven areas need to be leveled a second time.

[0015] As described above and through practical application, the underwater pipe connection device of this invention precisely fixes the lower body of the half-joint to the pipe using positioning bolts, avoiding the problem of difficult underwater positioning of the lower body of the half-joint and the pipe. Through the guiding action of two types of guide rods, precise and rapid underwater alignment of the upper and lower bodies of the half-joint is achieved, reducing the underwater operation time and difficulty for divers and significantly shortening the construction cycle. By reducing the number of underwater operation steps and time for divers, the safety risks caused by complex environmental factors such as water flow and tides are reduced, better protecting the health and safety of divers. The underwater pipe connection device of this invention ensures uniform and consistent gaps between the upper and lower body connection parts through limiting components, preventing misalignment of the upper and lower parts of the half-joint during installation and ensuring connection quality. Attached Figure Description

[0016] Figures 1 to 3 This is a schematic diagram illustrating the usage state of an underwater pipe connection device according to one embodiment of the present invention, wherein... Figure 1 This is the state after the first and second guide rods are inserted into the lower body of the split connector. Figure 2 This refers to the state when the upper body of the splitter is lowered and connected to the lower body. Figure 3 This is the state after the first and second guide rods have been lifted.

[0017] Figure 4 for Figure 2 A magnified view of a portion of the image.

[0018] Figure 5 This is a schematic diagram illustrating the construction sequence of multiple pipe sections in an underwater pipe connection method according to one embodiment of the present invention.

[0019] The attached figures are labeled as follows: 1. Half-joint; 2. Spreader beam; 3. Lifting component; 4. First guide rod; 5. Second guide rod; 6. Limiting component; 7. Limiting ring; 8. Pipe; 11. Upper body; 12. Lower body; 13. Connecting part; 14. Positioning hole; 15. Lifting blind hole; 21. First through hole; 22. Second through hole; 31. Lifting part; 32. Threaded rod; 81. Positioning blind hole; 91. Positioning bolt; 92. Fastening bolt; 93. Limiting bolt. Detailed Implementation

[0020] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0021] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 the invention and simplifying the description, and 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 the invention.

[0022] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figures 1 to 5 As shown, in this embodiment, an underwater pipeline connection device is disclosed, including a split joint 1, a spreader beam 2, a hoisting component 3, a first guide rod 4, a second guide rod 5, and two limiting components 6.

[0024] The split connector 1 is used to clamp and connect two adjacent pipes 8. The split connector 1 has a split structure, including a lower body 12 and an upper body 11. Both ends of the lower body 12 and the upper body 11 extend outwards to form connecting portions 13 for connection. Each connecting portion 13 has a through bolt hole for inserting a fastening bolt 92. To pre-fix the lower body 12 to the pipe 8, multiple positioning holes 14 are evenly distributed on the lower body 12; in this embodiment, there are three. The positioning holes 14 are preferably countersunk holes. When the positioning bolt 91 connects the split connector 1 to the pipe 8, the outer end of the positioning bolt 91 is in the countersunk hole, which does not affect the vertical position of the pipe 8. In other embodiments, the number of positioning holes 14 can be increased or decreased according to the size of the pipe 8 and the split connector 1, ensuring that the lower body 12 of the split connector 1 can be securely connected to the pipe 8. The upper body 11 has a lifting blind hole 15 at the top middle part, and the lifting blind hole 15 has a pre-made internal thread.

[0025] The spreader beam 2 is a rigid crossbeam, serving as the support structure for the first guide rod 4 and the second guide rod 5. It has a first through hole 21 in its middle and a second through hole 22 at each end. The position of the first through hole 21 corresponds to the lifting blind hole 15 of the upper body 11, and the position of the second through hole 22 corresponds to the position of the bolt holes after the upper and lower bodies 12 are connected. The lifting component 3 is used to connect to the lifting equipment. Its upper part is a lifting section 31 that can connect to the hook of the lifting equipment; for example, the lifting section 31 can be a lifting ring or a hook. The lower part of the lifting component 3 is a threaded rod 32 that passes through the first through hole 21 and is threadedly connected to the lifting blind hole 15. The diameter and pitch of the threaded rod 32 match the lifting blind hole 15, allowing it to pass through the first through hole 21 and be threadedly connected to the lifting blind hole 15.

[0026] The first guide rod 4 and the second guide rod 5 are detachably inserted into the second through hole 22 and the bolt hole, respectively, to guide the upper body 11 and the lower body 12 of the split joint 1 to be accurately aligned during hoisting and docking. Figures 1 to 3 As shown, the first guide rod 4 and the second guide rod 5 are respectively set on the left and right sides of the spreader beam 2.

[0027] Two limiting members 6 are respectively movably fitted onto the first guide rod 4 and the second guide rod 5. The lower end of the limiting member 6 forms a groove that can engage with the connecting portion 13 of the split connector 1, used to control the final position of the upper body 11 as it is lowered, and to ensure that the gap between the upper and lower connecting portions 13 meets the installation requirements. The width of this groove is slightly larger than the width of the connecting portion 13, allowing it to be stably engaged with the connecting portion 13. A third through hole is provided in the middle of the limiting member 6, for movably fitting onto the first guide rod 4 or the second guide rod 5. When the limiting member 6 is engaged with the connecting portion 13, the third through hole aligns with the bolt hole on the connecting portion 13, facilitating the passage of the two guide rods.

[0028] Specifically, during construction, the lower body 12 of the split connector 1 is pre-installed at the end of the pipe 8. The upper body 11 of the split connector 1 is suspended from the middle of the spreader beam 2 by the lifting device 3. After the first guide rod 4 and the second guide rod 5 at both ends of the spreader beam 2 are inserted into the bolt holes of the lower body 12, the upper body 11 of the split connector 1 is lowered. It can then move down along the first guide rod 4 and the second guide rod 5 to be opposite the lower body 12. Then, the limiting device 6 is locked onto the upper and lower connecting parts 13 to prevent the upper body 11 from moving relative to the lower body 12, making it easy for the user to insert the fastening bolt 92 into the unobstructed bolt holes on the connecting parts 13, thus completing the installation and fixing of the split connector 1. Through this underwater pipe connection device, the split connector 1 between two sections of underwater pipe 8 can be accurately and quickly fixed together, so that the two adjacent sections of pipe 8 are fixed, reducing underwater operation time, reducing safety risks caused by complex environmental factors such as water flow and tides, and better protecting the health and safety of divers.

[0029] In this embodiment, the distance from the lower end of the first guide rod 4 to the flat beam 2 is different from the distance from the lower end of the second guide rod 5 to the flat beam 2. This length difference design ensures that the operation sequence is sequential when inserting the bolt holes of the lower body 12, avoiding interference when the two guide rods are inserted simultaneously, and making the alignment process smoother.

[0030] In this embodiment, the upper ends of the first guide rod 4 and the second guide rod 5 are provided with limiting rings 7. The diameter of the limiting rings 7 is larger than the diameter of the second through hole 22 to prevent the guide rods from slipping off the spreader beam 2 during hoisting. The limiting rings 7 can be welded or bolted to the two guide rods. The diameter of the limiting rings 7 is larger than the diameter of the second through hole 22 on the spreader beam 2 to prevent the guide rods from slipping off from above.

[0031] In this embodiment, the longitudinal section of the limiting member 6 is H-shaped, and both its upper and lower ends have slots that can be engaged with the connecting part 13. This structure makes the limiting member 6 versatile, and during lifting and final placement, the upper and lower slots respectively limit the upper and lower connecting parts 13.

[0032] In this embodiment, an underwater pipe connection method is also disclosed, which uses the above-mentioned underwater pipe connection device and mainly includes the following steps: Step S1: Drill a positioning blind hole 81 on the outer wall of the end of the pipe 8 to be installed. The depth of the positioning blind hole 81 shall not exceed half the wall thickness of the pipe 8. Set an internal thread in the positioning blind hole 81.

[0033] Specifically, firstly, according to design requirements, multiple positioning blind holes 81 are drilled on the outer wall of the end of the pipe 8 to be connected. The positions of the positioning blind holes 81 correspond one-to-one with the positioning holes 14 on the lower body 12, and their depth is controlled to not exceed half the wall thickness of the pipe 8 to ensure that the structural strength of the pipe 8 is not compromised. Subsequently, internal threads are formed by tapping inside the positioning blind holes 81. For example, in this embodiment, the depth of the positioning blind holes 81 is 2 / 5 of the wall thickness.

[0034] Step S2: Fit the lower body 12 of the split connector 1 onto the end of the pipe 8, thread the front end of the positioning bolt 91 through the positioning hole 14 and connect it to the positioning blind hole 81, so that the lower body 12 of the split connector 1 is fixed to the end of the pipe 8, and hoist several sections of pipe 8 to the underwater preset position and connect them together.

[0035] Specifically, on land or on a work vessel, the lower body 12 of the split connector 1 is fitted onto the end of the pipe 8, aligning the positioning hole 14 with the positioning blind hole 81 on the pipe 8. Then, the positioning bolt 91 is passed through the positioning hole 14, screwed into the positioning blind hole 81, and tightened, thereby fixing the lower body 12 in the predetermined position on the pipe 8. After fixing, the pipe 8 is hoisted and lowered to the predetermined position in the underwater trench, aligning the ends of the multiple pipe sections 8.

[0036] Step S3: Pass the threaded rod 32 at the bottom of the lifting component 3 through the first through hole 21 of the spreader beam 2 and thread it together with the lifting blind hole 15 of the upper body 11 of the half joint 1. Put the two limiting components 6 on the first guide rod 4 and the second guide rod 5 respectively and make the lower end lock on the connecting part 13. Insert the first guide rod 4 and the second guide rod 5 into the second through hole 22 and the bolt hole of the upper body 11 respectively.

[0037] Specifically, preparations for the hoisting of the upper body 11 are carried out on the water surface working platform. First, the threaded rod 32 of the hoisting component 3 is passed through the first through hole 21 of the spreader beam 2, and then screwed into the hoisting blind hole 15 of the upper body 11 and tightened. Next, the two limiting components 6 are respectively fitted onto the first guide rod 4 and the second guide rod 5. Then, the first guide rod 4 and the second guide rod 5 are inserted into the second through hole 22 of the spreader beam 2, so that their limiting rings 7 are locked on the upper surface of the spreader beam 2; then, the lower ends of the two guide rods are inserted into the bolt holes of the upper body 11, and the limiting components 6 are moved so that their slots are locked on the connecting parts 13 at both ends of the upper body 11. At this point, the spreader beam 2, the upper body 11, the hoisting component 3, the first guide rod 4, the second guide rod 5 and the limiting components 6 form an integral unit to be hoisted.

[0038] Step S4: Connect the lifting part 31 of the lifting component 3 to the lifting equipment, and lift the spreader beam 2, the upper body 11, the first guide rod 4 and the second guide rod 5 into the water as a whole, so that the first guide rod 4 and the second guide rod 5 are respectively inserted into the bolt holes of the lower body 12.

[0039] Specifically, the hook of the lifting equipment is connected to the lifting part 31 of the lifting component 3, and the entire unit is lifted and slowly submerged in water. When approaching the already installed lower body 12, with the assistance of a diver, the lower guide rod is first inserted into the bolt hole at one end of the lower body 12. The lowering continues until the lower end of the higher guide rod is inserted into the bolt hole at the other end of the lower body 12. The design of the two guide rods, one long and one short, avoids interference that may occur when inserted simultaneously, making the insertion process smoother and providing precise guidance.

[0040] Step S5: Lower the upper body 11 of the half-connector 1 so that the slot of the limiting member 6 is engaged with the connecting part 13 of the lower body 12, connect the upper body 11 and the lower body 12 of the half-connector 1 together, unscrew the threaded rod 32 from the lifting blind hole 15, and install a limiting bolt 93 with a diameter larger than the inner diameter of the first through hole 21 at the lower end of the threaded rod 32, lift the spreader beam 2, the first guide rod 4 and the second guide rod 5, and tighten the remaining bolts of the half-connector 1 into place.

[0041] Specifically, the upper body 11 is lowered along the guide rod until the slot at the lower end of the limiting member 6 fitted on the guide rod engages with the connecting part 13 of the lower body 12. At this point, the upper body 11 is in place, and its connecting part 13 aligns with the connecting part 13 of the lower body 12, facilitating the subsequent installation of the fastening bolts 92. The diver then installs several fastening bolts 92 to initially connect and fix the upper and lower bodies 12. Then, the threaded rod 32 of the lifting component 3 is rotated in the opposite direction to disengage it from the lifting blind hole 15 of the upper body 11. To prevent the threaded rod 32 from accidentally slipping out of the first through hole 21, a limiting bolt 93 with a diameter larger than the first through hole 21 can be screwed onto its lower end. Finally, the spreader beam 2, guide rod, limiting member 6, and lifting component 3 are lifted back to the surface as a whole. At this point, the diver can safely and accurately insert all the remaining fastening bolts 92 into the bolt holes and complete the final tightening.

[0042] Step S6: Following steps S3 to S5 above, install the upper body 11 sequentially on all the pipe 8 interfaces that need to be connected.

[0043] like Figure 5 As shown, in order to reduce cumulative errors and ensure overall installation accuracy, the preferred installation sequence is to start from the interface in the middle position and then proceed to the interfaces on the left and right sides in sequence.

[0044] In this embodiment, before the pipeline 8 is laid in step S2, the flatness of the underwater pipeline 8 foundation trench is re-measured. If an uneven area is found, it needs to be leveled again or filled with gravel to ensure that the pipeline 8 is placed stably and to avoid excessive additional stress at the connection of the pipeline 8 due to uneven settlement of the foundation.

[0045] The underwater pipe 8 connection device and method of the present invention precisely fixes the lower body 12 of the half-joint 1 to the pipe 8 using positioning bolts 91, avoiding the problem of difficult underwater positioning of the lower body 12 of the half-joint 1 and the pipe 8. Through the guiding action of two types of guide rods, precise and rapid underwater alignment of the upper body 11 and lower body 12 of the half-joint 1 is achieved, reducing the underwater operation time and difficulty for divers and significantly shortening the construction cycle. By reducing the number of underwater operation steps and time for divers, the safety risks caused by complex environmental factors such as water flow and tides are reduced, better protecting the health and safety of divers. The underwater pipe 8 connection device of the present invention ensures that the gap between the connecting parts 13 of the upper and lower bodies 12 is uniform and consistent through the limiting member 6, avoiding misalignment of the upper and lower parts of the half-joint 1 during installation and fixing, and ensuring connection quality.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An underwater pipe connection device, characterized in that, include: The split joint has a positioning hole through the lower body and a lifting blind hole in the upper body. The lower body and the upper body have opposing connecting parts at both ends, and bolt holes are formed on the connecting parts. The spreader beam has a first through hole in the middle that is opposite to the lifting blind hole, and second through holes at both ends that are opposite to the bolt holes; The lifting component has an upper part that can be connected to lifting equipment, and a lower part that is a threaded rod that passes through the first through hole and is threadedly connected to the lifting blind hole. The first guide rod and the second guide rod are respectively disposed in the second through hole and the bolt hole; Two limiting members are respectively fitted onto the first guide rod and the second guide rod, and the lower end of the limiting member has a groove that can be locked into the connecting part.

2. The underwater pipeline connection device as described in claim 1, characterized in that, The lower body is provided with a plurality of positioning holes evenly distributed on it.

3. The underwater pipeline connection device as described in claim 2, characterized in that, The positioning hole is a countersunk hole that can accommodate a positioning bolt.

4. The underwater pipeline connection device as described in claim 1, characterized in that, The lifting part is a lifting ring or a lifting hook.

5. The underwater pipeline connection device as described in claim 1, characterized in that, The upper ends of the first guide rod and the second guide rod are provided with limiting rings, and the diameter of the limiting rings is larger than the diameter of the second through hole.

6. The underwater pipeline connection device as described in claim 5, characterized in that, The distance from the lower end of the first guide rod to the spreader beam is different from the distance from the lower end of the second guide rod to the spreader beam.

7. The underwater pipeline connection device as described in claim 4, characterized in that, The longitudinal section of the limiting member is H-shaped, and both the upper and lower ends of the limiting member have slots that can be engaged with the connecting part.

8. A method for connecting underwater pipes, employing the underwater pipe connection device as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Drill a positioning blind hole at the end of the pipe to be installed. The depth of the positioning blind hole shall not exceed half the wall thickness of the pipe. Tap the positioning blind hole to form an internal thread. S2. Fit the lower body of the half-connector onto the end of the pipe, thread the front end of the positioning bolt through the positioning hole and connect it to the positioning blind hole, so that the lower body of the half-connector is fixed to the end of the pipe, and hoist several sections of the pipe to the preset underwater position and connect them together. S3. After passing the threaded rod at the bottom of the lifting component through the first through hole of the spreader beam, connect it to the lifting blind hole of the upper body of the half joint. Put the two limiting pieces on the first guide rod and the second guide rod respectively and make the slots lock on the connecting part. Insert the first guide rod and the second guide rod into the second through hole and the bolt hole of the upper body respectively. S4. Connect the lifting part of the lifting component to the lifting equipment, and lift the spreader beam, upper body, first guide rod and second guide rod as a whole into the water, so that the first guide rod and second guide rod are respectively inserted into the bolt holes of the lower body; S5. Lower the upper body of the half-joint so that the slot of the limiting member is engaged in the connecting part of the lower body, connect the upper body and the lower body of the half-joint together, unscrew the threaded rod from the lifting blind hole, and install a limiting bolt with a diameter larger than the inner diameter of the first through hole at the lower end of the threaded rod. Lift the spreader beam, the first guide rod and the second guide rod, and tighten the remaining bolts of the half-joint into place. S6. Repeat steps S3 to S5 until all the half-fittings on the pipes are installed.

9. The underwater pipeline connection method as described in claim 8, characterized in that, In steps S3 to S6, the middle half-joint is installed first, and then the remaining half-joints are installed on the left and right sides.

10. The underwater pipeline connection method as described in claim 8, characterized in that, Before hoisting several sections of the pipeline to the preset underwater position, the flatness of the underwater pipeline trench is re-measured, and uneven areas need to be leveled a second time.

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