HDPE pipe moored positioning system and HDPE pipe moored positioning method

Abstract

The present invention relates to the technical field of HDPE pipe transportation, and in particular to an HDPE pipe moored positioning system and an HDPE pipe moored positioning method. The HDPE pipe moored positioning system comprises a barge, a crane vessel, a tugboat, several auxiliary vessels, and several positioning anchors, wherein the tugboat is configured to tow an HDPE pipe; the barge and the crane vessel are configured to position the HDPE pipe from two ends of the HDPE pipe; the positioning anchors are symmetrically arranged on two sides of the HDPE pipe; the positioning anchors are configured to position the HDPE pipe; and the auxiliary vessels are configured to move the HDPE pipe. Compared with conventional steel pipe pile construction processes, the moored positioning system provides stable positioning points by means of the positioning anchors symmetrically arranged on two sides of the HDPE pipe, simplifies construction steps by means of the cooperative operation of the tugboat, the barge, the crane vessel and the auxiliary vessels, and in particular, does not require complex mounting and removal of steel pipe piles, thereby greatly reducing construction time and significantly improving construction efficiency.

Description

A mooring and positioning system and method for HDPE pipes

[0001] This application claims priority to Chinese Patent Application No. 202411812552.2, filed on December 10, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of HDPE pipeline transportation technology, and in particular to an HDPE pipeline mooring and positioning system and method. Background Technology

[0003] HDPE (High Density Polyethylene) pipes are well-suited for use as seawater intake pipes in seawater cooling systems due to their superior properties, such as reliable connections, strong impact resistance, outstanding crack resistance, aging resistance, and corrosion resistance.

[0004] When large-diameter (inner diameter exceeding 3m) and heavy-duty (pipe section length exceeding 5.5m, linear weight exceeding 0.9t / m) HDPE pipes arrive at the installation location, they need to be moored and positioned before being laid due to the influence of sea waves. Currently, steel pipe piles are commonly used for mooring and positioning of large-diameter and heavy HDPE pipes. However, the construction process of steel pipe piles is complex and the construction efficiency is low, which cannot meet the construction period requirements. Therefore, a more accurate and efficient mooring and positioning method for HDPE pipes is needed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of traditional HDPE pipe positioning using steel pipe piles, which results in low construction efficiency and inability to meet tight construction schedules. This invention provides an HDPE pipe mooring and positioning system and method.

[0006] In a first aspect, the present invention provides an HDPE pipe mooring and positioning system, comprising a barge, a crane vessel, a tugboat, several auxiliary vessels, and several positioning anchors. The tugboat is used to tow the HDPE pipe. The barge and the crane vessel are used to position the HDPE pipe from both ends. The positioning anchors are symmetrically arranged on both sides of the HDPE pipe and are used to position the HDPE pipe. The auxiliary vessels are used to move the HDPE pipe.

[0007] The auxiliary vessels include a first auxiliary vessel, a second auxiliary vessel, a third auxiliary vessel, and a fourth auxiliary vessel, and the process includes the following steps:

[0008] S11: The barge and crane vessel are pre-positioned at the location where the pipeline is to be installed; the first auxiliary vessel is positioned on the side of the HDPE pipeline closest to the location where the pipeline is to be installed, the third and fourth auxiliary vessels are positioned on the side of the HDPE pipeline furthest from the location where the pipeline is to be installed, and the second auxiliary vessel is connected to the tail of the HDPE pipeline.

[0009] S12: Use a tugboat to tow the HDPE pipe to the vicinity of the installation location. Use a second auxiliary vessel to tow the tail of the HDPE pipe towards the crane vessel, while the third and fourth auxiliary vessels push the HDPE pipe towards the installation location. Use the fourth auxiliary vessel to connect the barge's winch traction cable to the HDPE pipe, then untie the tugboat and leave. Use the third auxiliary vessel to connect the barge's other winch traction cable to the HDPE pipe. Use the first auxiliary vessel to connect the crane vessel's winch traction cable to the tail of the HDPE pipe. Use the barge and crane vessel to pull and adjust the HDPE pipe to align it with the installation location, achieving initial positioning of the HDPE pipe.

[0010] S13: Based on the real-time wind direction, the leeward auxiliary vessel pushes the HDPE pipe to the windward side. The winches of the barge and crane vessel, in conjunction with the traction cable, adjust until there is enough space on the windward side for the leeward auxiliary vessel to carry the positioning anchor cable. After the positioning anchor cable is carried on the windward side, the leeward auxiliary vessel pushes the HDPE pipe to the leeward side. The winches of the barge and crane vessel, in conjunction with the traction cable, adjust until there is enough space on the leeward side for the leeward auxiliary vessel to carry the positioning anchor cable. The positioning anchor is then symmetrically installed on both sides of the HDPE pipe to achieve secondary positioning of the HDPE pipe.

[0011] The HDPE pipeline mooring and positioning system provided by this invention, compared with the traditional steel pipe pile construction process, provides stable positioning points by symmetrically arranging positioning anchors on both sides of the HDPE pipeline. This ensures that the pipeline can maintain a precise position when disturbed by sea waves. By utilizing the coordinated operation of tugboats, barges, crane vessels, and auxiliary vessels, the construction steps are simplified. In particular, the complex installation and removal of steel pipe piles are eliminated, which greatly reduces construction time, significantly improves construction efficiency, and can better meet the requirements of tight schedules.

[0012] Preferably, the weight of the positioning anchor is ≥3t.

[0013] Setting the weight of the positioning anchor to ≥3t ensures that the positioning anchor can effectively position large-diameter, heavy HDPE pipes, ensuring accurate mooring and positioning of HDPE pipes.

[0014] Preferably, the number of positioning anchors is four, and the spacing between the positioning anchors on the same side of the HDPE pipe is 150m-180m.

[0015] Setting the spacing of the positioning anchors at 150m-180m ensures that the anchors can effectively position large-diameter, heavy HDPE pipes, ensuring accurate mooring and positioning of HDPE pipes.

[0016] In a second aspect, the present invention provides a mooring and positioning method for HDPE pipelines, using the aforementioned HDPE pipeline mooring and positioning system, wherein the auxiliary vessel includes a first auxiliary vessel, a second auxiliary vessel, a third auxiliary vessel, and a fourth auxiliary vessel, and includes the following steps:

[0017] S11: The barge and crane vessel are pre-positioned at the location where the pipeline is to be installed; the first auxiliary vessel is positioned on the side of the HDPE pipeline closest to the location where the pipeline is to be installed, the third and fourth auxiliary vessels are positioned on the side of the HDPE pipeline furthest from the location where the pipeline is to be installed, and the second auxiliary vessel is connected to the tail of the HDPE pipeline.

[0018] S12: Use a tugboat to tow the HDPE pipe to the vicinity of the installation location. Use a second auxiliary vessel to tow the tail of the HDPE pipe towards the crane vessel, while the third and fourth auxiliary vessels push the HDPE pipe towards the installation location. Use the fourth auxiliary vessel to connect the barge's winch traction cable to the HDPE pipe, then untie the tugboat and leave. Use the third auxiliary vessel to connect the barge's other winch traction cable to the HDPE pipe. Use the first auxiliary vessel to connect the crane vessel's winch traction cable to the tail of the HDPE pipe. Use the barge and crane vessel to pull and adjust the HDPE pipe to align it with the installation location, achieving initial positioning of the HDPE pipe.

[0019] S13: Based on the real-time wind direction, the leeward auxiliary vessel pushes the HDPE pipe to the windward side. The winches of the barge and crane vessel, in conjunction with the traction cable, adjust until there is enough space on the windward side for the leeward auxiliary vessel to carry the positioning anchor cable. After the positioning anchor cable is carried on the windward side, the leeward auxiliary vessel pushes the HDPE pipe to the leeward side. The winches of the barge and crane vessel, in conjunction with the traction cable, adjust until there is enough space on the leeward side for the leeward auxiliary vessel to carry the positioning anchor cable. The positioning anchor is then symmetrically installed on both sides of the HDPE pipe to achieve secondary positioning of the HDPE pipe.

[0020] The HDPE pipeline mooring and positioning method provided by this invention systematically divides the mooring and positioning of HDPE pipelines in the seaside area into initial positioning and secondary positioning, fully taking into account the influence of the marine wind and wave environment, greatly improving positioning efficiency, significantly shortening operation time, and meeting the needs of tight construction schedules.

[0021] Specifically, the four auxiliary vessels, according to their respective functions, completed tasks such as pipe tail towing, lateral jacking, and cable connection, enhancing the flexibility of the construction process. The barge and crane vessel used winches to achieve precise traction and adjustment of the HDPE pipe, and their cooperation with the auxiliary vessels further optimized the positioning operation. In the initial positioning stage, the coordinated traction of the barge, crane vessel, and auxiliary vessels enabled the pipe to quickly align with the target installation position. In the secondary positioning stage, the step-by-step cable connection of the upwind and leeward positioning anchors ensured the stability and accuracy of the final HDPE pipe positioning, solving the positioning offset problem that easily occurs in traditional methods.

[0022] This method fully considers the impact of real-time wind direction and utilizes the jacking capability of the auxiliary vessel to compensate for wind and waves in the HDPE pipeline, ensuring that the pipeline can stably and accurately reach the target position. This dynamic adjustment method enhances the system's ability to cope with complex offshore construction environments and reduces the risk of positioning failure due to wind and waves.

[0023] Compared to traditional steel pipe pile positioning, which requires complex equipment and extensive manual labor for installation and removal, resulting in high time and costs, this method relies entirely on vessels and positioning anchors for pipeline positioning, significantly simplifying the construction process. While greatly improving mooring and positioning efficiency, construction resources are optimized, reducing overall construction costs.

[0024] Preferably, in S11, the barge is pre-moored at the docking end of the pipeline to be installed, and the crane vessel is pre-moored at the water filling end of the pipeline to be installed.

[0025] In this setup, the docking end is the critical location where the HDPE pipe connects to other pipes or structures at the installation site. The barge possesses strong traction and securing capabilities, enabling precise positioning and fine-tuning of the pipe using a winch to ensure perfect alignment of the docking end with the connecting components at the installation location. The filling end requires water injection to control the pipe's buoyancy and balance. The crane vessel's equipment and operational capabilities are suitable for completing the water filling operation, while its winch provides traction and stabilization to the pipe tail, ensuring a stable pipe posture during the filling process and laying the foundation for subsequent positioning.

[0026] Preferably, in step S11, the barge and crane vessel are pre-positioned 45m-55m away from the location where the pipeline is to be installed.

[0027] Maintaining a distance of 45m-55m between the barges and crane vessels and the pipeline installation location provides ample space for connecting tow cables, adjusting the pipeline's floating position, and operating the auxiliary vessels, avoiding congestion or equipment collisions caused by vessels being too close together. This larger operating space allows the auxiliary vessels to freely adjust the pipeline's position and flexibly cooperate during initial and secondary positioning, ensuring smooth overall operation.

[0028] Preferably, in S12, before using a tugboat to tow the HDPE pipe to the vicinity of the pipe installation location, the barge is moved away from the tugboat to ensure that the tugboat can tow the HDPE pipe to the pipe installation location.

[0029] During HDPE pipe towing, the tugboat needs sufficient space to adjust its traction direction and apply towing force. If the barge is moored too close or in the towing route, the tugboat's operations may be restricted, affecting the towing efficiency. By first moving the barge to the side away from the tugboat, a clear working path is provided for the tugboat, avoiding interference between vessels and ensuring a smooth towing process.

[0030] Preferably, the method further includes the following steps:

[0031] S21: The crane vessel is moved to a safe water area near the pipeline installation location for temporary mooring. Pipeline winches are symmetrically installed on both sides of the pipeline trench on the shore. The shore winches include a first pipeline winch, a second pipeline winch, a third pipeline winch, and a fourth pipeline winch. The second and third auxiliary vessels are used to drag the HDPE pipeline into the pipeline trench at a constant speed along the axis of the HDPE pipeline. The fourth auxiliary vessel is always at the tail of the HDPE pipeline.

[0032] S22: When the second and third auxiliary vessels enter the pipe trench and are 50m-70m away from the shore end of the pipe trench, the fourth auxiliary vessel tows the HDPE pipe in the opposite direction towards the sea. The second and third auxiliary vessels decelerate and then tow the HDPE pipe at a constant speed to continue entering the pipe trench. When the tail of the HDPE pipe is towed to the bow of the crane vessel, the fourth auxiliary vessel tows it in the opposite direction towards the sea, and the first auxiliary vessel connects the winch traction cable of the crane vessel to the tail of the HDPE pipe.

[0033] S23: The third auxiliary vessel unmoored and left, and used the third auxiliary vessel to connect the traction cable of the second pipe trench winch to the HDPE pipe head; the second auxiliary vessel unmoored and left, and used the second auxiliary vessel to connect the traction cable of the first pipe trench winch to the HDPE pipe head, completing the HDPE pipe head positioning cable.

[0034] S24: The second and third auxiliary vessels leave the HDPE pipe head area and use the second and third auxiliary vessels to bring the third and fourth pipe trench winches to the HDPE pipe with cables; the fourth auxiliary vessel unties the cable and leaves, and uses the fourth auxiliary vessel to connect the winch traction cable of the crane vessel to the HDPE pipe tail to complete the initial positioning of the HDPE pipe.

[0035] S25: The crane vessel is moved to the location where the pipeline is to be installed. The crane vessel and the pipe trench winch work together to pull and adjust the position of the HDPE pipeline, thereby achieving secondary positioning of the HDPE pipeline.

[0036] The HDPE pipeline mooring and positioning method provided by this invention can also be used for mooring and positioning HDPE pipelines in both sea-side and shore-side areas: The crane vessel is pre-positioned in safe waters near the pipeline installation location for temporary mooring to avoid interference with other vessels or equipment, while simultaneously remaining on standby for subsequent operations. A symmetrical pipe trench winch system is installed on the shore side to ensure uniform distribution of traction force within the pipe trench area, allowing the HDPE pipeline to be smoothly towed into the trench without deviation or jamming. The second and third auxiliary vessels tow the pipeline into the trench at a uniform speed along its axis, precisely controlling the pipeline's movement path and preventing lateral swaying during towing from affecting the positioning effect. The fourth auxiliary vessel performs a tail-running operation at the stern of the pipeline, preventing instability at the stern and quickly adjusting the pipeline angle to ensure stability during the trench entry process.

[0037] Before initial positioning, the winch traction cable of the crane vessel is connected to the stern of the pipe. The crane vessel provides continuous traction through the cable, controlling the position of the rear end of the pipe throughout the positioning process. This prevents the stern from drifting due to inertia or water flow, ensuring the pipe remains under control. After stabilizing the stern, the apex is positioned. Applying traction in stages effectively avoids problems such as excessive local stress or inconsistent force directions that might occur when applying traction to both ends of the pipe simultaneously, protecting the integrity of the pipe structure. With the stern fixed, the overall degree of freedom of the pipe is greatly reduced. Positioning the apex only requires minor adjustments to the front end, significantly reducing the complexity of multi-vehicle collaboration and improving the accuracy of apex positioning. Fixing the stern provides a stable force base for the apex, making the winch operation smoother and reducing the risk of unexpected pipe swaying during cable handling. After the pipe tail is fixed and the pipe head is positioned with cable, the initial positioning stage is carried out by using a crane boat and a pipe trench winch to tighten and adjust the position of the pipe. This results in greater overall stability, reduces repeated adjustments caused by pipe offset or water flow, and improves the efficiency of initial positioning. After the initial positioning is completed, a secondary positioning is used for fine-tuning to align the direction, angle, and position of the pipe with the docking position, meeting the high precision requirements of the project.

[0038] This method first connects the hoisting cable of the crane vessel to the stern of the pipe, and then performs the pipe head positioning and cable-driven operation. Dividing the positioning process into clearly defined stages helps optimize the stress distribution on the pipeline and reduces operational risks and complexity. This approach allows for more efficient initial and secondary pipeline positioning, ensuring accuracy and safety during construction, and providing reliable support for subsequent docking operations.

[0039] Preferably, the method further includes the following steps:

[0040] S31: The pipeline to be installed is located between the first installed pipeline and the second installed pipeline. The crane vessel is moved to the top of the first installed pipeline for temporary mooring. The first pipe trench winch is installed on one side of the pipe trench on the shore, and the second pipe trench winch is symmetrically installed on the other side of the pipe trench.

[0041] S32: The second and third auxiliary vessels tow the HDPE pipe into the trench in tandem. The first auxiliary vessel trails the end of the HDPE pipe. When the end of the HDPE pipe is 50m-70m from the end of the trench where the second installed pipe is located, the fourth auxiliary vessel tows the HDPE pipe in the opposite direction towards the sea. The second and third auxiliary vessels decelerate to slow down the HDPE pipe. When the third auxiliary vessel travels to a distance of 20m-30m from the end of the trench, the fourth auxiliary vessel, located at the tail of the HDPE pipe, maintains the same speed as the third vessel but travels in the opposite direction. The first auxiliary vessel connects the winch traction cable of the crane vessel to the tail of the HDPE pipe.

[0042] S33: The third auxiliary vessel unmoored and departed, and used the third auxiliary vessel to connect the traction cable of the first pipe trench winch to the head of the HDPE pipe; the second auxiliary vessel unmoored and departed, and used the second auxiliary vessel to connect the traction cable of the second pipe trench winch to the head of the HDPE pipe; the fourth auxiliary vessel unmoored and departed, and used the fourth auxiliary vessel to connect the winch traction cable of the crane vessel to the tail of the HDPE pipe, thus completing the initial positioning of the HDPE pipe.

[0043] S34: The crane vessel is moved to the location where the pipeline is to be installed. The crane vessel and the trench winch work together to pull and adjust the position of the HDPE pipeline, thereby achieving secondary positioning of the HDPE pipeline.

[0044] The HDPE pipeline mooring and positioning method provided by this invention can also be used for mooring and positioning HDPE pipelines in shore-side areas: when the HDPE pipeline is 50m-70m away from the second installed pipeline, the pipeline speed is gradually reduced by the reverse towing of the fourth auxiliary vessel and the deceleration coordination of the tandem towing auxiliary vessels, so as to avoid the pipe head directly impacting the end of the trench or deviating from the path; the fourth auxiliary vessel at the tail of the pipe runs in opposite directions and at the same speed as the third auxiliary vessel, further reducing the risk of pipeline sway and the tail end being affected by water flow, and ensuring the stability of the pipeline attitude when entering the trench.

[0045] First, the pipe tail is connected using a crane vessel winch. Once stable, an auxiliary vessel connects the traction cables of the first and second pipe trench winches to the pipe head. This phased operation reduces the difficulty of overall pipeline positioning and improves the accuracy of initial positioning. After the pipe tail is secured by the crane vessel, the pipe head's degrees of freedom are reduced, making the positioning cable operation more stable and efficient, laying a good foundation for final docking. After initial positioning, the crane vessel moves to the pipeline's installation location and works in conjunction with the trench winches to perform secondary traction adjustments. This gradual, fine-tuning approach avoids deviations that might occur with direct docking, ensuring docking accuracy.

[0046] Preferably, the weight of the positioning anchor is ≥3t, and the first, second, third, and fourth pipe groove winches are all 10t winches.

[0047] The positioning anchor weighs ≥3t, sufficient to resist the pulling force on the HDPE pipe from environmental factors such as tidal currents and waves in the construction water area, ensuring the positioning anchor is firmly fixed on the seabed and increasing the anchoring effect. The HDPE pipe has a large diameter and long length, significantly increasing its weight and drag resistance in water. The 10t winch has sufficient traction reserve to meet the needs of precise positioning of the HDPE pipe in tidal currents or complex environments. The combination of the positioning anchor (≥3t) and the 10t winch forms a powerful tension system, maintaining the stable posture of the pipe in complex environments and providing a good foundation for subsequent precise docking.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] 1. The HDPE pipeline mooring and positioning system provided by this invention, compared with the traditional steel pipe pile construction process, provides stable positioning points by symmetrically arranging positioning anchors on both sides of the HDPE pipeline. This ensures that the pipeline can maintain a precise position when disturbed by sea waves. By utilizing the coordinated operation of tugboats, barges, crane vessels, and auxiliary vessels, the construction steps are simplified. In particular, the complex installation and dismantling of steel pipe piles is eliminated, which greatly reduces construction time, significantly improves construction efficiency, and can better meet the requirements of tight schedules.

[0050] 2. The HDPE pipeline mooring and positioning method provided by the present invention systematically divides the mooring and positioning of HDPE pipelines in the seaside area into initial positioning and secondary positioning when mooring and positioning HDPE pipelines in the seaside area. It fully considers the influence of the sea wind and wave environment, greatly improves the positioning efficiency, significantly shortens the operation time, and meets the needs of tight construction schedules.

[0051] 3. The HDPE pipeline mooring and positioning method provided by this invention utilizes four auxiliary vessels, each fulfilling its function to perform tasks such as pipe stern towing, lateral pushing, and cable connection, thereby enhancing the flexibility of the construction process. The barge and crane vessel achieve precise traction and adjustment of the HDPE pipeline via winches, and their cooperation with the auxiliary vessels further optimizes the positioning operation. In the initial positioning stage, the coordinated traction of the barge, crane vessel, and auxiliary vessels enables the pipeline to quickly align with the target installation position. In the secondary positioning stage, the step-by-step cable connection of the upwind and leeward positioning anchors ensures the stability and accuracy of the final HDPE pipeline positioning, solving the positioning offset problem that easily occurs in traditional methods.

[0052] 4. The HDPE pipeline mooring and positioning method provided by this invention fully considers the influence of real-time wind direction and utilizes the jacking capability of an auxiliary vessel to compensate for wind and waves in the HDPE pipeline, ensuring that the pipeline can stably and accurately reach the target position. This dynamic adjustment method enhances the system's ability to cope with complex marine construction environments and reduces the risk of positioning failure due to wind and waves. Compared with traditional steel pipe pile positioning, which requires complex equipment and a large amount of manual operation for installation and removal, resulting in high time consumption and costs, this method relies entirely on vessels and positioning anchors to achieve pipeline positioning, significantly simplifying the construction process. While greatly improving mooring and positioning efficiency, construction resources are optimized and overall construction costs are reduced. Attached Figure Description

[0053] Figure 1 is a schematic diagram of a tugboat towing an HDPE pipe to its installation location in the seaside area.

[0054] Figure 2 is a schematic diagram of the initial positioning of HDPE pipelines in the seaside area;

[0055] Figure 3 is a schematic diagram of the secondary positioning of HDPE pipelines in the seaside area;

[0056] Figure 4 shows the layout of the crane vessels in the seaside and shoreside areas;

[0057] Figure 5 shows a schematic diagram of HDPE pipeline towing in the seaside and shoreside areas;

[0058] Figure 6 is a schematic diagram showing the connection between the first auxiliary vessel in the seaside and shoreside areas and the winch traction cable of the crane vessel to the tail of the HDPE pipe.

[0059] Figure 7 is a schematic diagram of HDPE pipe head positioning with cable in the seaside and shoreside areas;

[0060] Figure 8 is a schematic diagram of the initial positioning of HDPE pipelines in the seaside and shoreside areas;

[0061] Figure 9 is a schematic diagram of the secondary positioning of HDPE pipelines in the seaside and shoreside areas;

[0062] Figure 10 is a schematic diagram of the crane vessel layout in the shore-side area;

[0063] Figure 11 is a schematic diagram of HDPE pipeline mooring in the shore area;

[0064] Figure 12 is a schematic diagram of the initial positioning of HDPE pipelines in the shore area;

[0065] Figure 13 is a schematic diagram of the secondary positioning of HDPE pipelines in the shore area.

[0066] Markings in the diagram: 1-Barge, 2-Crane vessel, 3-Tugboat, 4-Positioning anchor, 51-First auxiliary vessel, 52-Second auxiliary vessel, 53-Third auxiliary vessel, 54-Fourth auxiliary vessel, 61-First trench winch, 62-Second trench winch, 63-Third trench winch, 64-Fourth trench winch, 100-HDPE pipe, 201-First installed pipe, 202-Second installed pipe. Detailed Implementation

[0067] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0068] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0069] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0070] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing between identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0071] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0072] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0073] Example 1

[0074] This embodiment provides an HDPE pipe mooring and positioning system for mooring and positioning large-diameter (inner diameter exceeding 3m) and heavy-duty (pipe section length exceeding 5.5m, linear weight exceeding 0.9t / m) HDPE pipes 100. Specifically, as shown in Figures 1-3, the HDPE pipe mooring and positioning system includes a barge 1, a crane vessel 2, a tugboat 3, several auxiliary vessels, and several positioning anchors 4. The tugboat 3 is used to tow the HDPE pipe 100. The barge 1 and the crane vessel 2 are used to position the HDPE pipe 100 from both ends. The positioning anchors 4 are symmetrically arranged on both sides of the HDPE pipe 100 and are used to position the HDPE pipe 100. The auxiliary vessels are used to move the HDPE pipe 100.

[0075] Furthermore, the weight of the positioning anchor 4 is ≥3t, as shown in Figure 3. There are four positioning anchors 4, and the spacing between the positioning anchors 4 on the same side of the HDPE pipe 100 is 150m-180m.

[0076] The HDPE pipeline mooring and positioning system provided in this embodiment, compared with the traditional steel pipe pile construction process, provides stable positioning points by symmetrically arranging positioning anchors 4 on both sides of the HDPE pipeline 100. This ensures that the pipeline can maintain a precise position when disturbed by sea waves. By utilizing the coordinated operation of tugboat 3, barge 1, crane vessel 2 and auxiliary vessels, the construction steps are simplified. In particular, the complex installation and removal of steel pipe piles is eliminated, which greatly reduces construction time and significantly improves construction efficiency, and can better meet the requirements of tight schedules.

[0077] Example 2

[0078] This embodiment provides a mooring and positioning method for HDPE pipelines, using the HDPE pipeline mooring and positioning system provided in Embodiment 1. The auxiliary vessels include a first auxiliary vessel 51, a second auxiliary vessel 52, a third auxiliary vessel 53, and a fourth auxiliary vessel 54, as shown in Figures 1-3. The method includes the following steps:

[0079] S11: As shown in Figure 1, specifically, barge 1 and crane vessel 2 are pre-positioned 45m-55m away from the pipeline installation location. Maintaining a distance of 45m-55m between barge 1 and crane vessel 2 and the pipeline installation location provides ample space for connecting the towing cable, adjusting the pipeline's floating position, and operating the auxiliary vessel, avoiding congestion or equipment collisions caused by vessels being too close. The larger operating space allows the auxiliary vessel to freely adjust the pipeline position and flexibly cooperate during initial and secondary positioning processes, ensuring smooth overall operation.

[0080] Barge 1 and crane vessel 2 are pre-positioned at the pipeline installation location. Specifically, barge 1 is pre-positioned at the docking end of the pipeline installation location, and crane vessel 2 is pre-positioned at the water-filling end. The docking end is the critical location where the HDPE pipe 100 connects to other pipes or structures at the installation location. Barge 1 possesses strong traction and securing capabilities, enabling precise positioning and fine-tuning of the pipeline using a winch traction cable to ensure perfect alignment of the docking end with the connecting components at the installation location. The water-filling end requires water filling to control the buoyancy and balance of the pipeline. Crane vessel 2's equipment and operational capabilities are suitable for completing the water-filling operation, while its winch can traction and stabilize the pipe tail, ensuring a stable pipeline posture during the water-filling process and laying the foundation for subsequent positioning.

[0081] The first auxiliary vessel 51 is moored on the side of HDPE pipe 100 closest to the installation location, the third auxiliary vessel 53 and the fourth auxiliary vessel 54 are moored on the side of HDPE pipe 100 furthest from the installation location, and the second auxiliary vessel 52 is connected to the tail of HDPE pipe 100.

[0082] S12: As shown in Figure 2, first move barge 1 away from tugboat 3 to ensure that tugboat 3 can tow HDPE pipe 100 to the pipe installation position. Then use tugboat 3 to tow HDPE pipe 100 to the vicinity of the pipe installation position. Use the second auxiliary boat 52 to tow the tail of HDPE pipe 100 towards crane boat 2. At the same time, the third auxiliary boat 53 and the fourth auxiliary boat 54 push HDPE pipe 100 towards the pipe installation position.

[0083] The fourth auxiliary vessel 54 connects the traction cable pre-pulled out by a winch of barge 1 to the pipe sling of HDPE pipe 100, and then tugboat 3 unmoors and leaves.

[0084] The third auxiliary vessel 53 is used to connect the traction cable pre-pulled out by another winch of the barge 1 to the pipe sling of the HDPE pipe 100.

[0085] The first auxiliary vessel 51 is used to connect the traction cables of the two winches of the crane vessel 2 to the pipe sling of the HDPE pipe 100. The four traction points of the barge 1 and the crane vessel 2 are used to pull and adjust the HDPE pipe 100 so that the HDPE pipe 100 is aligned with the pipe to be installed, thus achieving the initial positioning of the HDPE pipe 100.

[0086] S13: As shown in Figure 3, according to the real-time wind direction, the auxiliary vessel on the leeward side pushes the HDPE pipe 100 to the windward side. The winches of barge 1 and crane vessel 2 work together with the traction cable to adjust until there is enough space on the windward side for the auxiliary vessel on the windward side to carry the positioning anchor 4 cable.

[0087] After the upwind positioning anchor 4 is secured with its cable, the upwind auxiliary vessel pushes the HDPE pipe 100 downwind. The winches of barge 1 and crane vessel 2 work together with the traction cable to adjust until there is enough space on the downwind side for the downwind auxiliary vessel to secure the positioning anchor 4 cable. This completes the securing of the downwind positioning anchor 4. The 3t positioning anchor 4 is then symmetrically installed on both sides of the HDPE pipe 100 to achieve secondary positioning of the HDPE pipe 100.

[0088] In this embodiment, S11-S13 are mainly used for mooring and positioning of HDPE pipe 100 in the seaside area. The HDPE pipe mooring and positioning method provided in this embodiment systematically divides the mooring and positioning of HDPE pipe 100 in the seaside area into initial positioning and secondary positioning. It fully considers the influence of the sea wind and wave environment, greatly improves positioning efficiency, significantly shortens operation time, and meets the needs of tight construction schedule.

[0089] Specifically, the four auxiliary vessels, according to their respective functions, completed tasks such as pipe tail towing, lateral jacking, and cable connection, enhancing the flexibility of the construction process. Barge 1 and crane vessel 2 used winches to achieve precise traction and adjustment of the HDPE pipe 100, and their cooperation with the auxiliary vessels further optimized the positioning operation. In the initial positioning stage, the coordinated traction of barge 1, crane vessel 2, and auxiliary vessels enabled the HDPE pipe 100 to quickly align with the target installation position. In the secondary positioning stage, the step-by-step cable connection of the upwind and leeward positioning anchors 4 ensured the stability and accuracy of the final positioning of the HDPE pipe 100, solving the positioning offset problem that easily occurs in traditional methods.

[0090] This method fully considers the impact of real-time wind direction and utilizes the jacking capability of the auxiliary vessel to compensate for wind and wave damage to the HDPE pipeline 100, ensuring that the pipeline can stably and accurately reach the target position. This dynamic adjustment method enhances the system's ability to cope with complex offshore construction environments and reduces the risk of positioning failure due to wind and waves.

[0091] Compared to traditional steel pipe pile positioning, which requires complex equipment and extensive manual labor for installation and removal, resulting in high time and costs, this method relies entirely on vessels and positioning anchors to achieve pipeline positioning, significantly simplifying the construction process. While greatly improving mooring and positioning efficiency, construction resources are optimized, reducing overall construction costs.

[0092] Example 3

[0093] Based on Example 2, as shown in Figures 4-9, the HDPE pipe mooring and positioning method provided in this example further includes the following steps:

[0094] S21: As shown in Figures 4 and 5, the crane vessel 2 is moved to a safe water area near the pipeline installation location for temporary mooring. Pipeline winches are symmetrically installed on both sides of the pipeline trench on the shore. The shore winches include a first pipeline winch 61, a second pipeline winch 62, a third pipeline winch 63, and a fourth pipeline winch 64. The second auxiliary vessel 52 and the third auxiliary vessel 53 are used to drag the HDPE pipeline 100 into the pipeline trench at a uniform speed along the axis of the HDPE pipeline 100. The fourth auxiliary vessel 54 is always at the tail of the HDPE pipeline 100.

[0095] S22: As shown in Figure 6, when the second auxiliary vessel 52 and the third auxiliary vessel 53 enter the pipe trench and are 50m-70m away from the shore end of the pipe trench, the fourth auxiliary vessel 54 tows the HDPE pipe 100 in the opposite direction to the sea. The second auxiliary vessel 52 and the third auxiliary vessel 53 decelerate, and then the second auxiliary vessel 52 and the third auxiliary vessel 53 tow the HDPE pipe 100 at a constant speed to continue entering the pipe trench. When the tail of the HDPE pipe 100 is towed to the bow of the crane vessel 2, the fourth auxiliary vessel 54 tows it in the opposite direction to the sea. The first auxiliary vessel 51 connects the traction cable pre-reserved by the winch of the crane vessel 2 to the tail of the HDPE pipe 100.

[0096] S23: As shown in Figure 7, the third auxiliary vessel 53 unmoored and left, and used the third auxiliary vessel 53 to connect the traction cable of the second pipe trench winch 62 to the pipe head of the HDPE pipe 100; the second auxiliary vessel 52 unmoored and left, and used the second auxiliary vessel 52 to connect the traction cable of the first pipe trench winch 61 to the pipe head of the HDPE pipe 100, thus completing the positioning and cable-pulling of the HDPE pipe 100 pipe head.

[0097] S24: As shown in Figure 8, the second auxiliary vessel 52 and the third auxiliary vessel 53 leave the head area of ​​the HDPE pipe 100. The second auxiliary vessel 52 and the third auxiliary vessel 53 bring the third pipe trench winch 63 and the fourth pipe trench winch 64 to the HDPE pipe 100 with cables. The fourth auxiliary vessel 54 unties the cable and leaves. The fourth auxiliary vessel 54 is used to connect the winch traction cable of the crane vessel 2 to the tail of the HDPE pipe 100 to complete the initial positioning of the HDPE pipe 100.

[0098] S25: As shown in Figure 9, the crane vessel 2 is moved to the position where the pipeline is to be installed. The crane vessel 2 and the pipe trench winch work together to pull and adjust the position of the HDPE pipeline 100, thereby achieving secondary positioning of the HDPE pipeline 100.

[0099] In this embodiment, steps S21-S25 can be used for mooring and positioning of the HDPE pipe 100 in the seaside and shoreside areas. The HDPE pipe mooring and positioning method provided in this embodiment involves the crane vessel 2 being pre-positioned in safe waters near the pipe installation location for temporary mooring, avoiding interference with other vessels or equipment, and simultaneously preparing for subsequent operations. A symmetrical pipe trench winch system is installed on the shoreside to ensure uniform distribution of traction force within the pipe trench area, allowing the HDPE pipe 100 to be smoothly towed into the trench without deviation or jamming. The second auxiliary vessel 52 and the third auxiliary vessel 53 tow the pipe 100 into the trench at a uniform speed along its axis, precisely controlling the pipe's movement path and preventing lateral swaying during towing from affecting the positioning effect. The fourth auxiliary vessel 54 performs a tail-running operation at the pipe's stern, preventing instability at the pipe's tail and quickly adjusting the pipe's angle to ensure stability during the trench entry process.

[0100] Before initial positioning, the winch traction cable of crane vessel 2 is connected to the stern of the pipe. Crane vessel 2 provides continuous traction force through the cable, enabling control of the stern position of the pipe throughout the positioning process. This prevents the stern from drifting due to inertia or water flow, ensuring the pipe remains under control. After stabilizing the stern, the stern is positioned. By applying traction force in stages, problems such as excessive local stress or inconsistent force directions that might occur when applying traction force to both ends of the pipe simultaneously are effectively avoided, protecting the integrity of the pipe structure. With the stern fixed, the overall degree of freedom of the pipe is greatly reduced. The positioning operation of the stern only requires minor adjustments to the front end, significantly reducing the complexity of multi-vessel cooperation and improving the accuracy of stern positioning. Fixing the stern provides a stable force base for the stern, making the winch operation with the cable smoother and reducing the risk of unexpected pipe swaying during cable handling. After the pipe tail is fixed and the pipe head is positioned with cables, the initial positioning stage involves tightening and adjusting the pipe position using a crane vessel 2 and a pipe trench winch. This enhances overall stability, reduces repeated adjustments due to pipe offset or water flow, and improves initial positioning efficiency. Following initial positioning, a secondary positioning process is used for fine-tuning to align the pipe's direction, angle, and position with the docking location, meeting the high precision requirements of the project.

[0101] This method first connects the traction cables of the two winches on the crane vessel to the stern of the pipe, and then performs the pipe head positioning and cable-driven operation. Dividing the positioning process into clearly defined stages helps optimize the stress distribution on the pipeline and reduces the risks and complexities of the operation. This approach allows for more efficient initial and secondary positioning of the pipeline, ensuring the accuracy and safety of the construction process, and providing reliable support for subsequent docking operations.

[0102] Example 4

[0103] Based on Example 3, as shown in Figures 10-13, the HDPE pipe mooring and positioning method provided in this example further includes the following steps:

[0104] S31: As shown in Figure 10, in this embodiment, when the HDPE pipe 100 is moored and positioned in the shore area, the HDPE pipe 100 can be a closure section. At this time, the pipe to be installed is located between the first installed pipe 201 and the second installed pipe 202. The crane vessel 2 is moved to the top of the first installed pipe 201 for temporary mooring. The first pipe trench winch 61 is installed on one side of the pipe trench on the shore, and the second pipe trench winch 62 is symmetrically installed on the other side of the pipe trench.

[0105] S32: As shown in Figure 11, the winch of crane vessel 2 can pre-wind approximately 20 meters of traction cable and store it beside the vessel. The second auxiliary vessel 52 and the third auxiliary vessel 53 tow the HDPE pipe 100 into the trench. The first auxiliary vessel 51 trails the end of the HDPE pipe 100. When the pipe head of the HDPE pipe 100 is 50m-70m away from the end of the trench of the second installed pipe 202, the fourth auxiliary vessel 54 tows the HDPE pipe 100 in the opposite direction towards the sea. The second auxiliary vessel 52 and the third auxiliary vessel 53 decelerate to slow down the HDPE pipe 100.

[0106] When the third auxiliary vessel 53 travels to a distance of 20m-30m from the end of the trench, the fourth auxiliary vessel 54, located at the tail of the HDPE pipe 100, maintains the same speed as the third auxiliary vessel 53 and travels in the opposite direction; the first auxiliary vessel 51 is used to connect the winch traction cable of the crane vessel 2 to the tail of the HDPE pipe 100.

[0107] S33: As shown in Figure 12, the third auxiliary vessel 53 is unmoored and leaves, and is used to connect the traction cable of the first pipe trench winch 61 to the head of the HDPE pipe 100; the second auxiliary vessel 52 is unmoored and leaves, and is used to connect the traction cable of the second pipe trench winch 62 to the head of the HDPE pipe 100; the fourth auxiliary vessel 54 is unmoored and leaves, and is used to connect the traction cable of the winch of the crane vessel 2 to the tail of the HDPE pipe 100, thus completing the initial positioning of the HDPE pipe 100.

[0108] S34: As shown in Figure 13, the crane vessel 2 is moved to the position where the pipeline is to be installed. The crane vessel 2 and the trench winch work together to pull and adjust the position of the HDPE pipeline 100, thereby achieving secondary positioning of the HDPE pipeline 100.

[0109] In this embodiment, S31-S34 can be used for mooring and positioning of the HDPE pipeline 100 in the shore area. The HDPE pipeline mooring and positioning method provided in this embodiment, when the HDPE pipeline 100 is approximately 50m-70m away from the second installed pipeline 202, gradually reduces the pipeline speed through the reverse towing of the fourth auxiliary vessel 54 and the deceleration coordination of the tandem towing auxiliary vessels, avoiding direct impact of the pipe head on the trench end or deviation from the path; the fourth auxiliary vessel 54 at the pipe stern moves in the opposite direction and at the same speed as the third auxiliary vessel 53, further reducing the risk of pipeline sway and the tail end being affected by water flow, ensuring the pipeline's stable attitude when entering the trench.

[0110] First, the winch on the crane vessel 2 is used to connect the pipe tail. After stabilization, the auxiliary vessel is used to connect the traction cables of the first and second pipe trench winches to the pipe head. This phased operation reduces the difficulty of overall pipeline positioning and improves the accuracy of initial positioning. After the pipe tail is fixed by the crane vessel 2, the pipe head's degree of freedom is reduced, making the positioning cable operation more stable and efficient, laying a good foundation for final docking. After the initial positioning is completed, the crane vessel 2 is moved to the pipeline's installation position and works in conjunction with the trench winch to perform secondary traction adjustment of the pipeline. This gradual adjustment and fine-tuning mode avoids deviations that may occur with direct docking, ensuring docking accuracy.

[0111] In this embodiment, the weight of the positioning anchor 4 is ≥3t, preferably a 3t positioning anchor. The first slot winch 61, the second slot winch 62, the third slot winch 63, and the fourth slot winch 64 are all 10t winches.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mooring and positioning system for HDPE pipes, characterized in that, The system includes a barge (1), a crane vessel (2), a tugboat (3), several auxiliary vessels, and several positioning anchors (4). The tugboat (3) is used to tow the HDPE pipe (100). The barge (1) and the crane vessel (2) are used to position the HDPE pipe (100) from both ends. The positioning anchors (4) are symmetrically arranged on both sides of the HDPE pipe (100) and are used to position the HDPE pipe (100). The auxiliary vessels are used to move the HDPE pipe (100). The auxiliary vessels include a first auxiliary vessel (51), a second auxiliary vessel (52), a third auxiliary vessel (53), and a fourth auxiliary vessel (54), and the process includes the following steps: S11: The barge (1) and crane vessel (2) are moored in advance at the location where the pipeline is to be installed; the first auxiliary vessel (51) is moored on the side of the HDPE pipeline (100) close to the location where the pipeline is to be installed, the third auxiliary vessel (53) and the fourth auxiliary vessel (54) are moored on the side of the HDPE pipeline (100) away from the location where the pipeline is to be installed, and the second auxiliary vessel (52) is connected to the tail of the HDPE pipeline (100); S12: Use tugboat (3) to tow the HDPE pipe (100) to the vicinity of the pipe installation location. Use the second auxiliary vessel (52) to tow the tail of the HDPE pipe (100) towards the crane vessel (2). At the same time, the third auxiliary vessel (53) and the fourth auxiliary vessel (54) push the HDPE pipe (100) towards the pipe installation location. Use the fourth auxiliary vessel (54) to connect the winch traction cable of the barge (1) to the HDPE pipe (100). After untying the mooring line, the third auxiliary vessel (53) is used to connect the traction cable of another winch on the barge (1) to the HDPE pipe (100); the first auxiliary vessel (51) is used to connect the traction cable of the winch on the crane vessel (2) to the tail of the HDPE pipe (100); the barge (1) and the crane vessel (2) are used to pull and adjust the HDPE pipe (100) so that the HDPE pipe (100) is aligned with the pipe to be installed, thus achieving the initial positioning of the HDPE pipe (100); S13: According to the real-time wind direction, the leeward auxiliary vessel pushes the HDPE pipe (100) to the windward side. The winches of the barge (1) and the crane vessel (2) adjust with the traction cable until there is enough space on the windward side for the leeward auxiliary vessel to carry the positioning anchor (4) cable. After the positioning anchor (4) on the windward side is secured with the cable, the leeward auxiliary vessel pushes the HDPE pipe (100) to the leeward side. The winches of the barge (1) and the crane vessel (2) adjust with the traction cable until there is enough space on the leeward side for the leeward auxiliary vessel to carry the positioning anchor (4) cable. The positioning anchor (4) is then symmetrically installed on both sides of the HDPE pipe (100) to achieve secondary positioning of the HDPE pipe (100).

2. The HDPE pipe mooring and positioning system according to claim 1, characterized in that the weight of the positioning anchor (4) is ≥3t.

3. The HDPE pipe mooring and positioning system according to claim 1, characterized in that, The number of positioning anchors (4) is four, and the spacing between the positioning anchors (4) on the same side of the HDPE pipe (100) is 150m-180m.

4. A method for mooring and positioning HDPE pipes, characterized in that, Using the HDPE pipe mooring and positioning system according to any one of claims 1-3, the auxiliary vessel includes a first auxiliary vessel (51), a second auxiliary vessel (52), a third auxiliary vessel (53), and a fourth auxiliary vessel (54), comprising the following steps: S11: The barge (1) and crane vessel (2) are moored in advance at the location where the pipeline is to be installed; the first auxiliary vessel (51) is moored on the side of the HDPE pipeline (100) close to the location where the pipeline is to be installed, the third auxiliary vessel (53) and the fourth auxiliary vessel (54) are moored on the side of the HDPE pipeline (100) away from the location where the pipeline is to be installed, and the second auxiliary vessel (52) is connected to the tail of the HDPE pipeline (100); S12: Use tugboat (3) to tow the HDPE pipe (100) to the vicinity of the pipe installation location. Use the second auxiliary vessel (52) to tow the tail of the HDPE pipe (100) towards the crane vessel (2). At the same time, the third auxiliary vessel (53) and the fourth auxiliary vessel (54) push the HDPE pipe (100) towards the pipe installation location. Use the fourth auxiliary vessel (54) to connect the winch traction cable of the barge (1) to the HDPE pipe (100). After untying the mooring line, the third auxiliary vessel (53) is used to connect the traction cable of another winch on the barge (1) to the HDPE pipe (100); the first auxiliary vessel (51) is used to connect the traction cable of the winch on the crane vessel (2) to the tail of the HDPE pipe (100); the barge (1) and the crane vessel (2) are used to pull and adjust the HDPE pipe (100) so that the HDPE pipe (100) is aligned with the pipe to be installed, thus achieving the initial positioning of the HDPE pipe (100); S13: According to the real-time wind direction, the leeward auxiliary vessel pushes the HDPE pipe (100) to the windward side. The winches of the barge (1) and the crane vessel (2) adjust with the traction cable until there is enough space on the windward side for the leeward auxiliary vessel to carry the positioning anchor (4) cable. After the positioning anchor (4) on the windward side is secured with the cable, the leeward auxiliary vessel pushes the HDPE pipe (100) to the leeward side. The winches of the barge (1) and the crane vessel (2) adjust with the traction cable until there is enough space on the leeward side for the leeward auxiliary vessel to carry the positioning anchor (4) cable. The positioning anchor (4) is then symmetrically installed on both sides of the HDPE pipe (100) to achieve secondary positioning of the HDPE pipe (100).

5. The HDPE pipe mooring and positioning method according to claim 4, characterized in that, In S11, the barge (1) is pre-positioned at the docking end of the pipeline to be installed, and the crane vessel (2) is pre-positioned at the water filling end of the pipeline to be installed.

6. The HDPE pipe mooring and positioning method according to claim 4, characterized in that, In S11, the barge (1) and crane vessel (2) are pre-positioned 45m-55m away from the location where the pipeline is to be installed.

7. The HDPE pipe mooring and positioning method according to claim 4, characterized in that, In S12, before using the tugboat (3) to tow the HDPE pipe (100) to the vicinity of the pipe installation location, the barge (1) is moved away from the tugboat (3) to ensure that the tugboat (3) can tow the HDPE pipe (100) to the pipe installation location.

8. The HDPE pipe mooring and positioning method according to claim 4, characterized in that, It also includes the following steps: S21: The crane vessel (2) is moved to a safe water area near the pipeline installation location for temporary mooring. Pipe winches are symmetrically installed on both sides of the pipe trench on the shore. The shore winches include the first pipe trench winch (61), the second pipe trench winch (62), the third pipe trench winch (63), and the fourth pipe trench winch (64). The second auxiliary vessel (52) and the third auxiliary vessel (53) are used to drag the HDPE pipe (100) into the pipe trench at a uniform speed along the axis of the HDPE pipe (100). The fourth auxiliary vessel (54) is always at the tail of the HDPE pipe (100). S22: When the second auxiliary vessel (52) and the third auxiliary vessel (53) enter the pipe trench and are 50m-70m away from the shore end of the pipe trench, the fourth auxiliary vessel (54) tows the HDPE pipe (100) in the opposite direction to the sea. The second auxiliary vessel (52) and the third auxiliary vessel (53) decelerate, and then the second auxiliary vessel (52) and the third auxiliary vessel (53) tow the HDPE pipe (100) at a constant speed to continue to enter the pipe trench. When the tail of the HDPE pipe (100) is towed to the bow of the crane vessel (2), the fourth auxiliary vessel (54) tows it in the opposite direction to the sea. The first auxiliary vessel (51) connects the winch traction cable of the crane vessel (2) to the tail of the HDPE pipe (100). S23: The third auxiliary vessel (53) unmoored and left, and used the third auxiliary vessel (53) to connect the traction cable of the second pipe trench winch (62) to the head of the HDPE pipe (100); the second auxiliary vessel (52) unmoored and left, and used the second auxiliary vessel (52) to connect the traction cable of the first pipe trench winch (61) to the head of the HDPE pipe (100), thus completing the positioning and cable-pulling of the head of the HDPE pipe (100); S24: The second auxiliary vessel (52) and the third auxiliary vessel (53) leave the head area of ​​the HDPE pipe (100). The second auxiliary vessel (52) and the third auxiliary vessel (53) bring the third pipe trench winch (63) and the fourth pipe trench winch (64) to the HDPE pipe (100) with cables. The fourth auxiliary vessel (54) unties the cable and leaves. The fourth auxiliary vessel (54) connects the winch traction cable of the crane vessel (2) to the tail of the HDPE pipe (100) to complete the initial positioning of the HDPE pipe (100). S25: The crane vessel (2) moves to the position where the pipeline is to be installed. The crane vessel (2) and the pipe trench winch work together to pull and adjust the position of the HDPE pipeline (100) to achieve secondary positioning of the HDPE pipeline (100).

9. A method for mooring and positioning HDPE pipes according to claim 8, characterized in that, It also includes the following steps: S31: The pipeline to be installed is located between the first installed pipeline (201) and the second installed pipeline (202). The crane vessel (2) is moved to the top of the first installed pipeline (201) for temporary mooring. The first pipe trench winch (61) is installed on one side of the pipe trench on the shore, and the second pipe trench winch (62) is symmetrically installed on the other side of the pipe trench. S32: The second auxiliary vessel (52) and the third auxiliary vessel (53) tow the HDPE pipe (100) into the trench in a tandem. The first auxiliary vessel (51) trails the end of the HDPE pipe (100). When the head of the HDPE pipe (100) is 50m-70m away from the end of the trench of the second installed pipe (202), the fourth auxiliary vessel (54) tows the HDPE pipe (100) in the opposite direction towards the sea. The second auxiliary vessel (52) and the third auxiliary vessel (53) decelerate the HDPE pipe (100). When the third auxiliary vessel (53) travels to a distance of 20m-30m from the end of the trench, the fourth auxiliary vessel (54) located at the tail of the HDPE pipe (100) maintains the same speed as the third auxiliary vessel (53) and travels in the opposite direction. The first auxiliary vessel (51) connects the winch traction cable of the crane vessel (2) to the tail of the HDPE pipe (100). S33: The third auxiliary vessel (53) leaves and uses the third auxiliary vessel (53) to connect the traction cable of the first pipe trench winch (61) to the head of the HDPE pipe (100); the second auxiliary vessel (52) leaves and uses the second auxiliary vessel (52) to connect the traction cable of the second pipe trench winch (62) to the head of the HDPE pipe (100); the fourth auxiliary vessel (54) leaves and uses the fourth auxiliary vessel (54) to connect the winch traction cable of the crane vessel (2) to the tail of the HDPE pipe (100), thus completing the initial positioning of the HDPE pipe (100); S34: The crane vessel (2) moves to the position where the pipeline is to be installed. The crane vessel (2) and the trench winch work together to pull and adjust the position of the HDPE pipeline (100) to achieve secondary positioning of the HDPE pipeline (100).

10. A method for mooring and positioning HDPE pipes according to claim 9, characterized in that, The weight of the positioning anchor (4) is ≥3t, and the first pipe groove winch (61), the second pipe groove winch (62), the third pipe groove winch (63), and the fourth pipe groove winch (64) are all 10t winches.

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