Bottom-supported ultra-shallow-draft high-horsepower multifunctional platform supply ship with lifting piles

Abstract

The invention discloses a bottom-supported ultra-shallow-draft high-horsepower multifunctional platform supply ship with lifting piles. The bottom-supported ultra-shallow-draft high-horsepower multifunctional platform supply ship comprises a main ship body, a multi-paddle propelling power system, a lifting pile positioning system, a water spraying floating system and a water ballast tank system. A pile body of the lifting pile positioning system penetrates through a vertical shaft arranged between a ship body deck and a ship body bottom plate and is connected with an upper pile embracing mechanism and a lower pile embracing mechanism which are fixed on the ship body deck and the ship body bottom plate respectively; the lifting device fixed end is fixed to the upper end face of a ship deck, the lifting device movable end is arranged at the upper end of the pile body and located above the lifting device fixed end, the lifting device fixed end is connected with a cylinder body of the lifting actuator cylinder, and the lifting device movable end is connected with a push rod of the lifting actuator cylinder. The platform is used for providing platform dragging, material transferring, fire rescue and other services for the ultra-shallow water sea area platform, has the capacity of sailing at high thrust power in the ultra-shallow water sea area, and has the functions of being capable of sitting at the bottom for a long time, resistant to sliding, strong in positioning, easy to float and the like.

Description

Technical Field

[0001] This invention relates to the field of platform supply vessel manufacturing, specifically to a bottom-mounted, ultra-shallow draft platform supply vessel with lifting piles. Background Technology

[0002] In order to improve the cost-effectiveness of extraction, the development of marine oil and gas resources is gradually extending to ultra-shallow waters such as tidal zones. This has created a demand for platform supply vessels that can provide various supporting services for marine platforms operating in ultra-shallow waters, and that can provide high-powered propulsion, floating and positioning capabilities, and bottom-sitting capabilities in ultra-shallow waters.

[0003] Due to the limitations of ultra-shallow water environment and the special requirements of operation, this type of platform supply vessel must have specific functions and meet certain constraints: (1) The main engine must be able to provide sufficient horsepower to enable the supply vessel to navigate and tow offshore structures in areas where the resistance of these vessels becomes severe; (2) Since it operates in ultra-shallow water, the draft of the vessel is strictly controlled and the diameter of the propeller is limited; (3) The hull must be able to sit on the seabed. After the hull sits on the seabed, the long-term action of the water flow will cause scouring and scouring of the hull foundation, which may cause the supply vessel to tilt and slip in severe cases. Therefore, the hull structure of the supply vessel must have the ability to resist scouring and scouring when it sits on the seabed; (4) When the platform supply vessel is sitting on the seabed, it mainly relies on the friction and adhesion between the bottom of the hull and the seabed to balance the horizontal load generated by the wind, waves and currents. Such friction and adhesion are often insufficient to resist the horizontal load borne by the hull under harsh environmental conditions. Therefore, the supply vessel needs to have anti-slip capability when it is on the bottom; (5) When the platform supply vessel is floating in ultra-shallow water, the waves and currents transmitted from the open sea will cause the horizontal load on the hull to increase due to the focusing effect. Under these conditions, the supply vessel needs to have a strong horizontal positioning capability; (6) After the platform supply vessel has been on the bottom in ultra-shallow water for a long time, the bottom of the hull will have a strong adhesion and adsorption force with the seabed soil, making it difficult for the hull to dewater and float. Therefore, the supply vessel is required to have the ability to easily refloat; (7) The ultra-shallow water is affected by river estuaries and tidal movements, and the water quality is usually relatively turbid. The seawater often contains a large amount of silt and other foreign matter. These foreign matter will predictably have adverse effects on the various seawater pumps and cooling devices on the platform supply vessel operating in ultra-shallow water, such as clogging pipes or even damaging equipment.

[0004] Existing platform supply vessel designs can only partially meet the aforementioned functional requirements and constraints: for ultra-shallow draft vessels, the limited hull height (molded depth) poses a challenge to the installation location of the hydraulic lifting pile system in order to achieve the function of pile insertion and positioning; the frequent pile insertion and extraction and hull-sitting and floating operations require the lifting pile system to simultaneously meet low pile insertion and extraction resistance and good anti-slip and impact load resistance capabilities; since the vessel needs to perform pile insertion and extraction and hull-sitting operations in ultra-shallow waters, the agitation of seabed sediment necessitates the optimization design of all shipboard equipment such as seawater pumps. To fully meet the above functional requirements and constraints, this invention patent discloses a design scheme for a hull-sitting, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles. Summary of the Invention

[0005] The main purpose of this invention is to address the needs of platform supply vessels that provide towing, anchoring, supply, rescue, external firefighting, and guard services for offshore oil production platforms or near-shore oil production facilities, requiring navigation, positioning, floating, or bottoming operations in ultra-shallow waters with a minimum water depth of 2.0 meters. The invention provides a design for a bottom-sinking, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel capable of long-term bottoming, easy resurfacing after prolonged bottoming operations, and possessing strong horizontal positioning capabilities (anti-scouring and anti-slipping capabilities) during navigation, positioning, floating, or bottoming operations.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles is characterized by comprising a main hull, a multi-propeller propulsion system, a lifting pile positioning system, a water jet buoyancy system, and a ballast water tank system.

[0008] The aforementioned lifting pile positioning system consists of a bow hydraulic lifting pile installed at the bow of the ship and a stern hydraulic lifting pile on the side of the loading deck. The stern and bow hydraulic lifting piles have identical structures, comprising a pile body, an upper lifting mechanism, a lower lifting mechanism, a fixed end of the lifting device, a movable end of the lifting device, and a lifting actuator cylinder. The pile body passes through a vertical shaft located between the ship's deck and bottom plate, and connects to the upper and lower lifting mechanisms fixed to the ship's deck and bottom plate, respectively. The fixed end of the lifting device is fixed to the upper surface of the ship's deck, and the movable end of the lifting device is located at the upper end of the pile body, above the fixed end. The fixed end of the lifting device is connected to the cylinder of the lifting actuator cylinder, and the movable end of the lifting device is connected to the push rod of the lifting actuator cylinder. The pile body is a hollow tube closed at both ends. Multiple pile fixing holes are spaced at intervals along at least one longitudinal surface of the hollow tube from top to bottom. A lifting ring is located at the upper part of the hollow tube, and a high-pressure gas connector and a pressure balance valve are located around the lifting ring. A groove structure is located on the outer periphery of the lower end of the pile body. Multiple water-permeable holes are located in the groove structure. The lower pile-holding mechanism is the same as the upper pile-holding mechanism, both consisting of a slider constraint ring and elastic nylon sliders. The slider constraint ring is a hollow circular ring, and multiple elastic nylon sliders are located on the inner surface of the circumference of the hollow ring. The fixed end and moving end of the lifting device include a locking slider, a lever, and a hydraulic actuator. The locking slider is located on the outer periphery of the pile body and is connected to the hydraulic actuator via the lever. The locking slider mates with the pile fixing holes.

[0009] The main hull is a large, wide-draft, displacement-type monohull with a flat bottom; the multi-propeller propulsion system, waterjet buoyancy system, and ballast tank system are installed on the main hull.

[0010] To further achieve the purpose of the present invention, preferably, the water jet buoyancy system includes a seawater pump and a bottom water jet device arranged at the bottom of the hull; the bottom water jet device includes a connecting pipe and a water jet hole; the seawater pump is connected to the connecting pipe through a pipe assembly, and the connecting pipe is connected to the water jet hole.

[0011] Preferably, the water spray hole is flat; the water spray hole is located in the concave structure of the bottom of the ship.

[0012] Preferably, there are 8-16 water spray devices, which are symmetrically arranged along the midship longitudinal section from the bow to the stern at the bottom of the hull. The distance between the water spray devices on the port and starboard sides is 0.5-0.75 times the width of the ship. The water spraying directions of the bottom water spray devices on the port and starboard sides are opposite and both point towards the bottom of the ship.

[0013] Preferably, the ballast water tank system consists of a seawater pump and a ballast water tank.

[0014] Preferably, the bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles also includes a central cooling system, a material loading system, and an external fire-fighting system; the central cooling system includes a seawater pump and a large-diameter shell-and-tube seawater-freshwater heat exchanger.

[0015] The material loading system includes dry bulk cargo tanks, a cargo loading deck, a towing winch, and a crane; the dry bulk cargo tanks are designed in the main hull, while the cargo loading deck, towing winch, and crane are installed on the deck.

[0016] The external fire protection system mainly includes fire monitors and fire monitor pumps; the number of fire monitors is 2-4, and the power is provided by the fire monitor pumps.

[0017] Preferably, the seawater pump is equipped with a vortex-type sediment separation device at its front end. The vortex-type sediment separation device consists of an inlet with a filter screen, a vortex plate, a guide pipe, a diversion pipe, and a dual-outlet drain pipe. The vortex plate includes at least one set of spiral guide vanes. The diversion pipe is a pipe with openings at both ends. The vortex plate is installed inside the guide pipe, with its front end connected to the inlet. The outer diameter of the diversion pipe is smaller than the inner diameter of the guide pipe. The diversion pipe is partially or entirely located inside the guide pipe. The inlet end of the diversion pipe is located at the rear end of the vortex plate. An outer water flow channel is formed on the outer periphery of the diversion pipe, and an inner water flow channel is formed inside the diversion pipe. The outlet end of the diversion pipe is connected to the dual-outlet drain pipe. The dual sewage outlets are connected to the outer water flow channel, and the clean water outlets are connected to the inner water flow channel.

[0018] Preferably, there are 2-4 sets of spiral guide vanes; the guide tube is an acceleration guide tube, and the inner diameter of the guide tube as a whole or the front end portion changes from large to small; the body of the diverter tube is a conical structure that increases in size.

[0019] Preferably, there are 4 to 10 nylon sliders, evenly spaced on the inner circumference of the hollow ring; the slider constraint ring is fixed to the shaft by bolts; and the elastic nylon slider is fixed to the slider constraint ring by bolts.

[0020] Preferably, there are two locking sliders, which are symmetrically arranged at the outer end of the pile locking mechanism. The two locking sliders are respectively connected to the two ends of the hydraulic actuator through two levers and are connected to the pile fixing hole.

[0021] Preferably, multiple pile fixing holes are provided at intervals from top to bottom on both sides of the longitudinal surface of the hollow tube.

[0022] Preferably, the large-scale, wide-draft, displacement-type monohull flat-bottomed hull has a beam-to-draft ratio of 5.6-10.6, a length-to-beam ratio of 3.2-4.0, an overall length of 65.0-75.0 meters, a beam of 18.0-20.0 meters, a depth of 3.8-4.5 meters, a draft of 1.9-3.2 meters, and a displacement of 2000.0-3600.0 tons. The hull plate thickness of the large-scale, wide-draft, displacement-type monohull flat-bottomed hull is 15-25% greater than the plate thickness required by the French Classification of Shipping (LCS) steel ship specifications for the design of ordinary multi-functional platform supply vessels. A large log is installed at the stern of the hull, with the bottom length of the log being 0.10-0.15 times the overall length of the hull and the width being 0.075-0.01 times the beam of the hull. The bottom of the log is flush with the keel baseline.

[0023] Preferably, the multi-propeller propulsion system includes a multi-propeller main propulsion system and a bow propulsion system; the multi-propeller main propulsion system consists of a multi-duct propeller or a multi-depth tunnel propeller connected to the main engine; the bow propulsion system consists of bow lateral thrusters connected to auxiliary engines; the number of bow lateral thrusters is 1-2; the number of multi-duct propellers or multi-depth tunnel propellers is 2-4; the multi-duct propellers are arranged symmetrically from the port side to the starboard side at the stern of the hull with the mid-section of the hull as the plane of symmetry, and the propeller diameter is 0.5-0.7 times the draft;

[0024] With the mid-section of the hull as the plane of symmetry, multi-deep tunnel propellers are symmetrically arranged in deep tunnels recessed into the hull at the stern. The propeller diameter is 0.5-0.8 times the draft, and the propeller blade tip is 0.02-0.5 times the draft above the bottom baseline.

[0025] Compared with conventional platform supply vessels operating in ordinary sea areas, the advantages of this invention are as follows:

[0026] (1) The technical solution described in this invention adopts a large-scale, wide-draft hull design with large logs and multiple ducted propellers or deep-tunnel propellers suitable for heavy-load operation, which enables the platform supply vessel of this invention to have a large displacement and propeller thrust in ultra-shallow waters with a minimum water depth of 2.0 meters. This avoids the problem of insufficient propulsion caused by propeller diameter limitations in shallow waters for conventional tugboats. It provides a solution for the hull and propulsion system design of multi-functional platform supply vessels that need to provide high-horsepower towing services and heavy-load material transportation services in ultra-shallow waters where propeller diameter is limited.

[0027] (2) In view of the need for the platform supply vessel to perform positioning and bottoming operations in ultra-shallow waters, the present invention uses technical measures such as reinforced hull structure with large logs, lifting pile positioning system, and water jet buoyancy system to enable the platform supply vessel of the present invention to maintain sufficient stability and structural strength when performing frequent bottoming and buoyancy operations in ultra-shallow waters.

[0028] (3) The lifting pile positioning system of the present invention is used to bear the lateral dynamic loads such as wind, waves, and currents on the hull during bottoming and floating operations, and to insert into the seabed after bottoming to maintain the position of the hull, so that the hull has the ability to be positioned and float, resist slippage, and have strong positioning. When the ship is floating in very shallow sea areas, by inserting the lifting pile into the seabed, the lifting pile positioning system helps it effectively resist the horizontal loads caused by the wind, waves, and currents transmitted from the open sea acting on the hull, so that the hull can freely make vertical heave movements while restraining its horizontal movement; when the ship is bottoming in very shallow sea areas, the lifting pile positioning system helps it resist the scouring, scouring and slippage of the hull foundation caused by the water flow, so that the hull has the ability to resist scouring and slippage when bottoming.

[0029] (4) The lifting pile positioning system of the present invention has been optimized for lateral dynamic loads and frequent pile insertion and extraction operations. The lateral load of the hull is transmitted to the pile body through the upper and lower pile clamping mechanisms. When the hull is subjected to impact loads from wind, waves and currents, the elastic nylon slider on the pile clamping mechanism will absorb part of the impact load, thereby reducing the risk of damage to the hydraulic lifting pile. A series of groove structures are arranged at the lower part of the pile body. During the pile insertion process, the groove structure can reduce the cross-sectional area of ​​the pile body, thereby reducing the pile insertion resistance. At the same time, it increases the cross-sectional area of ​​the lower part of the pile body to increase the friction between the pile body and the pile hole, reducing the possibility of the hull accidentally floating after the pile is inserted. In addition, the pile head permeable holes are arranged on the pile body. High-pressure gas connectors, pressure balancing valves, and other equipment allow the steel pile's inner cavity to connect with the outside and store seawater. By injecting high-pressure air into the inner cavity, the stored seawater is ejected outward through the pile head's permeable holes. This achieves the effect of spraying seawater from the pile head into the pile hole, reducing friction between the pile and the seabed and the adhesion of seabed silt, without the need for complex seawater pipelines inside the pile, and at a lower equipment and production cost. It also reduces the power requirements of the lifting actuator and improves the efficiency of pile insertion and extraction operations.

[0030] (5) The ballast water tank system and water jet buoyancy system equipped on this vessel enable the platform supply vessel to easily re-float after a relatively long period of hull-bottoming operations. After the hull has bottomed, the bottom of the hull and the seabed soil tend to have strong adhesion and adsorption forces, making it difficult for the hull to dewater and float. Using the ballast water tank system and water jet buoyancy system described in this invention, when the platform supply vessel needs to bottom-bottom, ballast water is pumped into the ballast water tanks to make the hull displacement greater than its buoyancy, thereby achieving bottom-bottoming; after the bottom-bottoming operation is completed, the water jet buoyancy system is used to help the hull overcome the seawater pressure difference and the adsorption force of the seabed silt, helping the supply vessel to float again.

[0031] (6) In view of the need for the platform supply vessel to operate and navigate in ultra-shallow waters with poor water quality, the multi-functional platform supply vessel of the present invention is equipped with a vortex-type sediment separation device in front of the inlet of the seawater pump and the central heat exchanger. At the same time, it adopts the design of a large-diameter shell-and-tube central heat exchanger, which reduces the possibility of foreign objects such as sediment in the seawater clogging the pipeline. Attached Figure Description

[0032] Figure 1 This is a front view of the overall layout of a supply vessel for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform with lifting piles.

[0033] Figure 2 This is a general layout drawing of the bilge deck of a supply vessel for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform with lifting piles.

[0034] Figure 3 This is a general layout drawing of the main deck of a multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft and high horsepower, equipped with lifting piles.

[0035] Figure 4 This is a general layout drawing of the foredeck of a multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft and high horsepower, equipped with lifting piles.

[0036] Figure 5 This is a general layout drawing of the bridge deck of a supply vessel for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform with lifting piles.

[0037] Figure 6 This is a front and rear view general arrangement drawing of a multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft and high horsepower, equipped with lifting piles.

[0038] Figure 7 This is a schematic diagram of a multi-propeller main propulsion system in the form of a ducted propeller for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with a lifting pile.

[0039] Figure 8 This is a schematic diagram of a multi-propeller main propulsion system in the form of a deep tunnel propeller for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with a lifting pile.

[0040] Figure 9-1 This is a longitudinal sectional view of the hull structure reinforcement at the bow lifting pile installation point of a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0041] Figure 9-2 This is a cross-sectional view of the hull structure reinforcement at the bow lifting pile installation point of a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0042] Figure 10-1This is a longitudinal sectional view of the hull structure reinforcement at the stern lifting pile installation location of a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0043] Figure 10-2 A cross-sectional view of the hull structure reinforcement at the stern of a supply vessel for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform with lifting piles.

[0044] Figure 11 This is a schematic diagram of the lifting pile structure for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0045] Figure 12 for Figure 11 Schematic diagram of the upper and middle pile-supported structure.

[0046] Figure 13 for Figure 11 A schematic diagram of the upper structure of the pile.

[0047] Figure 14 for Figure 11 A cross-sectional view of the pile body.

[0048] Figure 15 This is a schematic diagram of the locking state of the pile locking structure of a multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft and high horsepower, equipped with a lifting pile.

[0049] Figure 16 This is a schematic diagram showing the unlocked state of the pile locking structure of a multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft and high horsepower design, featuring a lifting pile.

[0050] Figure 17 This is a schematic diagram of the hydraulic lifting process of the lifting steel piles for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0051] Figure 18 This is a flowchart illustrating the process of setting up a high-powered, multi-functional platform supply vessel with a lifting pile in ultra-shallow waters.

[0052] Figure 19 This is a flowchart illustrating the pile-planting and positioning process for a multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft and high horsepower configuration, located in shallow waters.

[0053] Figure 20 A bottom view schematic diagram of the bottom water jet device for a buoyancy system supplying a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform with lifting piles.

[0054] Figure 21 This is a top view of the bottom water jet device of a water jet buoyancy system for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with a lifting pile.

[0055] Figure 22 This is a schematic diagram showing the distribution of the bottom water jetting device in the water jetting buoyancy system of a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0056] Figure 23 This is a schematic diagram of a vortex-type sediment separation device component for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with a lifting pile.

[0057] Figure 24 A cross-sectional view of a vortex-type sediment separation device for a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles.

[0058] The diagram shows: 1-1 multi-duct propeller, 1-2 stern hydraulic lifting pile, 1-3 crane, 1-4 fire monitor, 1-5 bow hydraulic lifting pile, 1-6 bow lateral thruster, 2-1 main engine, 3-1 cargo loading deck, 3-2 towing winch, 7-1 large log, 8-1 deep tunnel structure, 9-1 reinforced deck longitudinal girder, 9-2 reinforced bottom longitudinal girder, 9-3 bottom strong beam, 9-4 deck strong beam, 10-1 anti-collision bulkhead, 11-1 pile body, 11-2 moving end of lifting device, 11-3 lifting actuator cylinder, 11-4 fixed end of lifting device, 11-5 hull deck, 11-6 shaft, 11-7 hull bottom plate, 11-8 lower pile clamping mechanism, 11-9 upper pile clamping mechanism, 12-1 spring 12-2 is a slider restraint ring; 13-1 is a lifting ring; 13-2 is a pile fixing hole; 13-3 is a high-pressure gas connector; 13-4 is a pressure balance valve; 14-1 is a grooved structure for the pile head; 14-2 is a water permeable hole for the pile head; 15-1 is a locking slider; 15-2 is a lever; 15-3 is a locking actuator; 20-1 is a water spray hole; 20-2 is a concave structure. 1-1 is the inlet of the bottom water spray device, 21-2 is the connecting pipe, 22-1 is the bottom water spray device, 23-1 is the inlet of the sediment separation device, 23-2 is the vortex plate, 23-3 is the guide pipe, 23-4 is the diversion pipe, 23-5 is the dual-outlet drain pipe, 24-1 is the inner water flow channel, 24-2 is the clean water outlet, 24-3 is the sewage outlet, and 24-4 is the outer water flow channel. Detailed Implementation

[0059] To better illustrate the technical solution, the following detailed description of a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with a lifting pile, according to the present invention, is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0060] It should be noted that the described embodiments may include specific parameters, structures, or features, but not every embodiment must include these parameters, structures, or features. Furthermore, such statements do not refer to the same embodiment. Moreover, when describing specific parameters, structures, or features in conjunction with embodiments, whether or not explicitly described, it indicates that incorporating such parameters, structures, or features into other embodiments is within the knowledge of those skilled in the art.

[0061] Furthermore, this invention uses certain terms to refer to specific components or parts, and those skilled in the art will understand that designers or manufacturers may use different names or terms to refer to the same component or part. The terms "comprising" and "including" as used in this invention are open-ended and should therefore be interpreted as "including but not limited to".

[0062] Figures 1-6 This invention illustrates the overall hull layout of a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles, according to the present invention. Figure 1 The main view of the overall layout of the platform supply vessel. Figure 2 General arrangement drawing of the bilge deck, Figure 3 Main deck general arrangement drawing Figure 4 Fore-deck general arrangement drawing, Figure 5 For the general arrangement drawing of the bridge deck, Figure 6 These are the forward and rearward general arrangement drawings of a multi-functional platform supply vessel, with the left image showing the forward general arrangement and the right image showing the rearward general arrangement. Figures 1-6 As shown, a bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles includes a main hull, a lifting pile positioning system, a multi-propeller propulsion system, a waterjet buoyancy system, and a ballast tank system. The main hull is a large, wide-draft, displacement-type monohull with a flat bottom. The multi-propeller propulsion system, lifting pile positioning system, waterjet buoyancy system, and ballast tank system are all located on the main hull. It should be noted that existing technologies for the main hull, multi-propeller propulsion system, lifting pile positioning system, waterjet buoyancy system, and ballast tank system can be referenced, although the terminology may differ, but the structure and function can be borrowed from existing technologies. The lifting pile positioning system consists of bow hydraulic lifting piles 1-5 installed at the bow and stern hydraulic lifting piles 1-2 on the side of the loading deck. The multi-propeller propulsion system includes a multi-duct propeller 1-1 or a multi-depth tunnel propeller, a bow lateral thruster 1-6, a main engine 2-1, and auxiliary engines.

[0063] Preferably, the platform supply vessel of the present invention further includes a cooling system, a material loading system, and an external fire protection system; the cooling system includes a seawater pump, a large-diameter shell-and-tube seawater-freshwater heat exchanger, and piping assemblies; the material loading system includes a dry bulk cargo hold, a crane 1-3, a material loading deck 3-1, and a towing winch 3-2; the external fire protection system includes fire monitors 1-4 and fire monitor pumps.

[0064] To achieve the requirements of high propulsion and heavy load capacity in extremely shallow waters, the hull needs to have a large beam-to-draft ratio to increase displacement and accommodate multiple high-power main engines within limited draft conditions. The preferred main hull design is a large, wide-draft, single-hull, flat-bottomed hull with a beam-to-draft ratio of 6.129, a length-to-beam ratio of 3.613, an overall length of 69.9 meters, a beam of 19 meters, a depth of 4.2 meters, a draft of 3.1 meters, and a displacement of 3475 tons. The thickness of the main hull plating is increased by 20% compared to the thickness required for the design of ordinary platform supply vessels in the French Bureau Veritas Rules for the classification of steel ships - NR467. The hull frame adopts a longitudinal and transverse structure. A large log 7-1 is installed at the mid-longitudinal section of the stern to maintain balance and support the weight of the stern when the hull is bottomed. The preferred length of the large log is 7.8m and the width is 1.6m. The bottom of the large log is flush with the baseline of the hull keel.

[0065] The multi-propeller propulsion system includes a multi-propeller main propulsion system and a bow propulsion system. The multi-propeller main propulsion system consists of a multi-duct propeller or a multi-depth tunnel propeller connected to the main engine 2-1. The bow propulsion system consists of bow side thrusters 1-6 connected to auxiliary engines. The number of bow side thrusters 1-6 is 1-2, and the number of multi-duct propellers or multi-depth tunnel propellers is 2-4. Preferably, the number of bow side thrusters 1-6 and auxiliary engines is 2.

[0066] Figure 7 As shown, the multi-duct propeller 1-1 has an acceleration-type propeller duct arranged around the propeller to reduce energy loss in the wake and improve propeller efficiency under heavy load conditions. The multi-duct propeller 1-1 is arranged symmetrically from port to starboard at the stern of the hull with the mid-section of the hull as the plane of symmetry. The propeller diameter is 0.5-0.7 times the draft. The number of multi-duct propeller 1-1 and main engine 2-1 is preferably 4, with a total main engine power of 4800kW. Under towing conditions with a draft of 1.9-3.2 meters, the maximum propulsion force of the ship is 27 tons. The propeller diameter is 1.9 meters.

[0067] Figure 8As shown, the multi-tunnel propeller features a deep tunnel structure 8-1 recessed into the hull. This deep tunnel structure 8-1 increases the propeller diameter and creates negative pressure, increasing the wake gain of the propeller at the stern and thus improving propulsion efficiency. With the mid-section of the hull as the plane of symmetry, the multi-tunnel propeller is symmetrically positioned within the deep tunnels recessed into the hull at the stern. The propeller diameter is 0.5-0.8 times the draft, and the propeller blade tip is 0.02-0.5 times the draft above the hull bottom baseline.

[0068] To transfer the vertical and horizontal loads between the ship and the hydraulic lifting piles, a method was adopted near the shaft where the lifting piles were installed. Figure 9-1 , Figure 9-2 , Figure 10-1 and Figure 10-2 The reinforcement structure is shown. Reinforced deck longitudinal girder 9-1, deck strong beam 9-4, and reinforced bottom longitudinal girder 9-2 and bottom strong beam 9-3 are installed near the shafts where the bow and stern lifting piles are installed to enhance the hull's bending stiffness. Elbow plates are used to reinforce the connections between the longitudinal girder and strong beam and the shafts. The bow lifting pile shaft is connected to the anti-collision bulkhead 10-1 to improve the torsional stiffness of the cross-section. Hatch coamings and reinforcement structures are installed at the deck openings of the bow and stern lifting pile shafts to further enhance the strength of the deck openings and serve as installation locations for the lifting devices.

[0069] Preferably, the lifting pile positioning system consists of a bow hydraulic lifting pile 1-5 installed at the bow and a stern hydraulic lifting pile 1-2 installed on the side of the loading deck. The stern hydraulic lifting pile 1-2 and the bow hydraulic lifting pile 1-5 have the same structure and are referred to as hydraulic lifting piles; for example... Figure 11 As shown, the hydraulic lifting pile consists of a pile body 11-1, an upper pile-holding mechanism 11-9, a lower pile-holding mechanism 11-8, a fixed end 11-4 of the lifting device, a movable end 11-2 of the lifting device, and a lifting actuator cylinder 11-3. The pile body 11-1 passes through a vertical shaft 11-6 located between the ship's deck 11-5 and the ship's bottom plate 11-7. The upper pile-holding mechanism 11-9 and the lower pile-holding mechanism 11-8, which are respectively fixed to the ship's deck and the ship's bottom plate, constrain the horizontal relative movement of the pile body and the ship's hull. The fixed end 11-4 of the lifting device is fixed to the upper end face of the ship's deck 11-5, and the movable end 11-2 of the lifting device is located on the upper end of the pile body 11-1, above the fixed end 11-4 of the lifting device. The fixed end 11-4 of the lifting device is connected to the cylinder of the lifting actuator cylinder 11-3, and the movable end 11-2 of the lifting device is connected to the push rod of the lifting actuator cylinder 11-3.

[0070] Figure 12 This is a schematic diagram of the upper pile-holding structure. The upper pile-holding mechanism has the same structure as the lower pile-holding mechanism, as shown below. Figure 12As shown, each component consists of a slider constraint ring 12-2 and elastic nylon sliders 12-1. The slider constraint ring 12-2 is a hollow circular ring, and multiple elastic nylon sliders 12-1 are provided on the inner surface of the circumference of the hollow circular ring. In this embodiment, the number of nylon sliders is preferably 8. When the hull is subjected to lateral loads such as wind, waves, and currents, the lateral loads acting on the hull are transferred to the pile body 11-1 via the lower pile-holding mechanism 11-8 and the upper pile-holding mechanism 11-9, and then transmitted to the seabed by the pile body. The reaction force provided by the seabed keeps the hull position unchanged. At this time, the elastic nylon sliders 12-1 play a role in reducing the impact load and reducing the risk of damage to the hydraulic lifting pile. When the hull is in a floating state, the upper pile-holding mechanism 11-9 and the lower pile-holding mechanism 11-8 have the function of restraining the horizontal drift of the hull, but allow the hull to make vertical swinging movements along the pile body.

[0071] Figure 13 This is a schematic diagram of the superstructure of the pile. Figure 14 This is a sectional view of the pile. As shown in the figure, the pile is a hollow tube closed at both ends. Multiple pile fixing holes 13-2 are spaced apart from top to bottom on both sides of the vertical plane of the hollow tube. The upper part of the pile includes a lifting ring 13-1 for maintenance and hoisting, a high-pressure gas connector 13-3, and a pressure balancing valve 13-4. The high-pressure gas connector 13-3 is used to connect to high-pressure gas from the ship, and the pressure balancing valve 13-4 is used to balance the air pressure inside and outside the pile 11-1. The lower outer periphery of the pile has a groove structure 14-1, on which multiple pile head permeable holes 14-2 are provided to connect the inner cavity of the pile to the outer surface. The boundary is connected; during pile driving, the air pressure balance valve 13-4 on the upper part of the pile body is opened, allowing seawater to flow into the inner cavity of the pile body under water pressure and expel the air in the cavity. The groove structure 14-1 reduces the cross-sectional area of ​​the pile body, thereby reducing the resistance of pile driving; during pile extraction, the air pressure balance valve 13-4 is closed, and high-pressure air is injected into the inner cavity of the pile body through the high-pressure gas connector 13-3, causing the seawater remaining in the inner cavity to spray out from the water permeable hole 14-2 at the pile head, achieving the effect of spraying seawater into the pile hole on the seabed, thereby eliminating the friction and adhesion of seabed silt on the pile body and reducing the resistance of pile extraction.

[0072] Figure 15 This is a schematic diagram of the locking state of the pile locking structure. Figure 16 This is a schematic diagram showing the unlocked state of the pile locking structure. As shown in the figure, both the fixed end 11-4 and the moving end 11-2 of the lifting device are equipped with pile locking structures, including a locking slider 15-1, a lever 15-2, and a locking actuator 15-3. The locking slider 15-1 is mounted on the pile locking structure and is connected to the locking actuator 15-3 via the lever 15-2. The movement direction of the locking slider 15-1 is parallel to the pile fixing hole 13-2 and can be operably connected with the pile fixing hole 13-2. Figure 15For the locked pile body locking structure, when the locking actuator 15-3 is in the retracted state, the locking slider 15-1 is wedged into the pile body fixing hole 13-2 under the drive of the lever 15-2, thus completing the locking of the lifting device and the pile body. Figure 16 For the unlocked pile locking structure, when the locking actuator 15-3 is in the extended state, the locking slider 15-1 is pulled out of the pile fixing hole by the lever 15-2, thus unlocking the lifting device from the pile.

[0073] Figure 17 The process of inserting a hydraulic lifting pile is shown from left to right, including the following steps:

[0074] (1) The hydraulic lifting pile is in the initial state. At this time, the pile body locking structure of the fixed end 11-4 of the lifting device and the moving end 11-2 of the lowering device are both in the locked state, and the lifting actuator 11-3 is in the retracted position.

[0075] (2) The pile locking structure of the moving end 11-2 of the lifting device is disconnected from the pile 11-1 and is in the unlocked state;

[0076] (3) Extend the lifting actuator 11-3 and raise the moving end 11-2 of the lifting device to the set height;

[0077] (4) The pile locking structure of the moving end 11-2 of the lifting device is restored to the connection with the pile and is in the locked state. At the same time, the pile locking structure of the fixed end 11-4 of the lifting device is disconnected from the connection with the pile 11-1 and is in the unlocked state.

[0078] (5) Retract the lifting actuator 11-3, and let the moving end 11-2 of the lifting device move downward together with the pile body 11-1;

[0079] (6) Repeat steps (2) to (5) until the pile reaches the predetermined position, and restore the connection between the pile locking structure of the lifting device moving end 11-2 and the pile 11-1, so that it is in a locked state.

[0080] For a multi-functional platform supply vessel with a shallow draft and high horsepower equipped with lifting piles, the lifting pile positioning system has two working modes, corresponding to the vessel's staking and positioning operations.

[0081] Figure 18 This diagram illustrates the hull-sitting operation mode of the lifting pile positioning system. In this mode, the water depth is relatively shallow, allowing the platform supply vessel to perform the hull-sitting operation. The lifting steel piles not only position the vessel but also prevent it from accidentally floating up after settling on the water. The hull-sitting operation process is as follows: Figure 18As shown, from top to bottom, before the operation begins, a detailed measurement of the seabed geology and hydrology of the operation area should be conducted to select a suitable operation area. After the platform supply vessel arrives at the predetermined operation position, the bow hydraulic lifting pile 1-5 and the stern hydraulic lifting pile 1-2 begin pre-pile driving operations, that is, the pile body extends downwards a portion until the pile head touches the seabed; then the vessel hull-sitting operation is carried out, water is injected into the water tank through the ballast water tank system to make the ship's weight greater than its buoyancy and slowly sink until the ship sits on the bottom. At this time, the pile body 11-1 is partially inserted into the seabed under the action of the ship's weight; after the bottom of the ship is completely in contact with the seabed, the pile driving operation is carried out, and the steel pile is further pressed into the seabed to the predetermined depth through the lifting actuator 11-3, thus completing the hull-sitting and pile driving operation of the platform supply vessel. When the platform supply vessel needs to be relocated after being placed on the seabed, pile 11-1 is first raised to a certain length. During the raising process, seawater is sprayed from the pile head into the pile hole to reduce the resistance of pile extraction. Then, the ballast water tanks are emptied and the water jet buoyancy system is activated to spray high-pressure water onto the bottom of the ship to reduce the effects of seawater pressure difference and seabed silt resistance. After the ship has completed the buoyancy operation, pile 11-1 is completely retracted, completing the ship buoyancy and pile extraction operation.

[0082] Figure 19 This is the stake-planting positioning mode of the lifting pile positioning system. In this mode, the water depth is relatively deep, making it unsuitable for the platform supply vessel to sit on the seabed. Stake 11-1 primarily serves to position the vessel and prevent drift. Similarly, before operations begin, detailed measurements of the seabed geology and hydrology of the work area are required to select a suitable stake-planting area. Once the platform supply vessel reaches the designated work position, the bow hydraulic lifting pile 1-5 and stern hydraulic lifting pile 1-2 directly begin stake-planting operations. The lifting actuators press stake 11-1 into the seabed to the predetermined depth in one go, achieving vessel positioning in shallow waters.

[0083] The water jet buoyancy system includes a seawater pump, piping assembly, and bottom water jet device 22-1. Figure 20 and Figure 21The diagram shows the structure of the seawater spraying device at the bottom of the ship, including a connecting pipe 21-2 and a spray nozzle 20-1. Seawater is pumped by a seawater pump and enters the connecting pipe 21-2 through the pipe assembly via the inlet of the seawater spraying device at the bottom of the ship (21-1). The connecting pipe 21-2 is connected to the spray nozzle 20-1. The spray nozzle 21-1 is preferably a flat spray nozzle with a flow straightener, and is preferably located within the concave structure 20-2 at the bottom of the ship. The concave structure 20-2 is a structure where the bottom of the ship is recessed upwards, which facilitates the installation of the spray nozzle 21-1 and prevents silt from clogging the spray nozzle. The connecting pipe 21-1 is a reducing pipe connecting the spray nozzle 20-1 and the pipe assembly. High-pressure seawater, pressurized by the seawater pump, flows into the spray nozzle 20-1 and is sprayed onto the bottom of the ship under the guidance of the pipe and the connecting pipe 21-2. The flat spray nozzle can increase the water flow velocity, thereby improving the spraying efficiency. At the same time, the flat spray nozzle reduces the height required for the concave structure, thereby reducing the hull pressure drag increased by the concave structure.

[0084] like Figure 22 As shown, the bottom water jet devices are symmetrically arranged along the midship longitudinal section from bow to stern at the bottom of the hull. Preferably, the distance between the water jet devices on the port and starboard sides is 0.65 times the ship's beam. The bottom water jet devices on the port and starboard sides spray water in opposite directions and both point towards the bottom of the hull, thereby improving the efficiency of the water jet buoyancy system in eliminating the adhesion force of seabed silt and avoiding additional lateral forces on the hull during water spraying. Preferably, there are 12 water jet devices.

[0085] Preferably, the ballast water tank system includes a seawater pump, a piping assembly, and a ballast water tank, which is located at the bottom of the main hull. The ballast water tank system is used to pump seawater into or out of the ballast water tank during the ship's hull-bottoming and buoyancy operations to control the ship's buoyancy.

[0086] Preferably, the seawater pump is equipped with a vortex-type sediment separator at its front end. This separator separates sediment and other foreign matter from the seawater before it enters the equipment that needs to pump seawater, reducing the risk of blockage or damage to the ship's water-using equipment. Figure 23 and Figure 24As shown, the vortex-type sediment separator consists of an inlet 23-1, a vortex plate 23-2, a guide pipe 23-3, a diversion pipe 23-4, and a double-outlet drain pipe 23-5. The vortex plate 23-2 includes at least one set of spiral-shaped guide vanes. The diversion pipe 23-4 is a pipe open at both ends. The vortex plate 23-2 is installed inside the guide pipe 23-3, with its front end connected to the inlet 23-1. The outer diameter of the diversion pipe 23-4 is smaller than the inner diameter of the guide pipe 23-3. The flow pipe 23-4 is partially or entirely located inside the guide pipe 23-3. The inlet end of the branch pipe is located at the rear end of the vortex plate. An outer water flow channel 24-4 is formed on the outer periphery of the branch pipe, and an inner water flow channel 24-1 is formed inside the branch pipe. The outlet end of the branch pipe is connected to the double-outlet drain pipe 23-5. The sewage outlet 24-3 of the double-outlet drain pipe 23-5 is connected to the outer water flow channel 24-1, and the clean water outlet 24-2 is connected to the inner water flow channel 24-1.

[0087] The preferred inlet 23-1 is equipped with a filter screen to initially isolate large foreign objects entering the pipe; the preferred guide pipe 23-3 is an acceleration guide pipe, with the inner diameter of the entire acceleration guide pipe or the front end portion changing from large to small; the preferred swirl plate 23-2 includes 2-4 sets of spiral guide vanes.

[0088] The working mode of the vortex sediment separator is as follows: when the seawater pump is operating, a negative pressure is generated at the front end of the seawater pump, causing seawater to flow from the inlet 23-1 into the vortex sediment separator installed at the front end of the seawater pump. The vortex plate 23-2, in conjunction with the guide pipe 23-3, is used to generate a circumferential rotational speed in the water flow. Under the centrifugal force generated by the water flow rotation, sediment and other impurities settle in the outer layer of the rotating water flow. Figure 24 As indicated by the dashed arrow, the water flows through the outer layer of the diversion pipe (channel 24-1) to the sewage outlet 24-3 in the dual-outlet drain pipe, while the inner layer of rotating water, with fewer impurities, flows... Figure 24 As indicated by the solid arrow, the water flows through the inner layer of the diversion pipe 24-1 to the clean water outlet 24-2 in the dual-outlet drain pipe, and the seawater pump is connected to the clean water outlet 24-2.

[0089] The platform supply vessel of this invention also includes a cooling system, a material loading system, and an external fire-fighting system. The cooling system comprises a seawater pump and a large-diameter shell-and-tube seawater-freshwater heat exchanger for cooling the main engine and auxiliary machinery. A sediment separation device is installed before the heat exchanger inlet, preferably with three radiators and a total heat dissipation power of 1800kW. The reason for choosing a large-diameter shell-and-tube central heat exchanger is that the seawater in ultra-shallow waters is relatively turbid due to the influence of tides and river estuaries; increasing the pipe diameter inside the heat exchanger can reduce the risk of water flow blockage within the heat exchanger.

[0090] The material loading system includes dry bulk cargo tanks, a material loading deck 3-1, a towing winch 3-3, and a crane 1-3. The dry bulk cargo tanks are located in the main hull, while the material loading deck 3-1, towing winch 3-3, and crane 1-3 are installed on the deck. Preferably, in this embodiment, the material carrying capacity is 1300 tons within a draft of 1.9-3.2 meters, of which 700 tons are dry bulk cargo and 600 tons are liquid cargo.

[0091] The external fire protection system mainly includes fire monitors and fire monitor pumps; the number of fire monitors is 2-4, and the power of the fire monitor pumps is provided by the main unit.

[0092] The seawater pump installed on the platform supply ship of this invention can be one or more. If it is one seawater pump, the water jet buoyancy system, the central cooling system, and the ballast water tank system are all shared. If it is multiple seawater pumps, the seawater pumps involved in the water jet buoyancy system, the central cooling system, and the ballast water tank system are designed separately.

[0093] It should be noted that, without departing from the spirit and essence of this invention, those skilled in the art can make various corresponding changes and modifications to the technical solutions described in this invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles, characterized in that: This includes the main hull, multi-propeller propulsion system, lifting pile positioning system, water jet buoyancy system, and ballast water tank system; The aforementioned lifting pile positioning system consists of a bow hydraulic lifting pile installed at the bow of the ship and a stern hydraulic lifting pile on the side of the loading deck. The stern and bow hydraulic lifting piles have identical structures, comprising a pile body, an upper lifting mechanism, a lower lifting mechanism, a fixed end of the lifting device, a movable end of the lifting device, and a lifting actuator cylinder. The pile body passes through a vertical shaft located between the ship's deck and bottom plate, and connects to the upper and lower lifting mechanisms fixed to the ship's deck and bottom plate, respectively. The fixed end of the lifting device is fixed to the upper surface of the ship's deck, and the movable end of the lifting device is located at the upper end of the pile body, above the fixed end. The fixed end of the lifting device is connected to the cylinder of the lifting actuator cylinder, and the movable end of the lifting device is connected to the push rod of the lifting actuator cylinder. The pile body is a hollow tube closed at both ends. Multiple pile fixing holes are spaced at intervals along at least one longitudinal surface of the hollow tube from top to bottom. A lifting ring is located at the upper part of the hollow tube, and a high-pressure gas connector and a pressure balance valve are located around the lifting ring. A groove structure is located on the outer periphery of the lower end of the pile body. Multiple water-permeable holes are located in the groove structure. The lower pile-holding mechanism is the same as the upper pile-holding mechanism, both consisting of a slider constraint ring and elastic nylon sliders. The slider constraint ring is a hollow circular ring, and multiple elastic nylon sliders are located on the inner surface of the circumference of the hollow ring. The fixed end and moving end of the lifting device include a locking slider, a lever, and a hydraulic actuator. The locking slider is located on the outer periphery of the pile body and is connected to the hydraulic actuator via the lever. The locking slider mates with the pile fixing holes. The main hull is a large, wide-draft, displacement-type monohull with a flat bottom; the multi-propeller propulsion system, waterjet buoyancy system, and ballast tank system are installed on the main hull.

2. The multi-functional platform supply vessel with a bottom-mounted, ultra-shallow draft, high horsepower and equipped with a lifting pile as described in claim 1, characterized in that, The water jet buoyancy system includes a seawater pump and a bottom water jet device arranged at the bottom of the hull; the bottom water jet device includes a connecting pipe and a water jet hole; the seawater pump is connected to the connecting pipe through a pipe assembly, and the connecting pipe is connected to the water jet hole.

3. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 2, characterized in that... The water spray hole is flat; the water spray hole is located in the concave structure of the bottom of the ship.

4. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 2, characterized in that... The water spraying devices consist of 8-16 units, arranged symmetrically along the midship longitudinal section from bow to stern at the bottom of the hull. The distance between the water spraying devices on the port and starboard sides is 0.5-0.75 times the ship's width. The water spraying directions of the bottom water spraying devices on the port and starboard sides are opposite and both point towards the bottom of the ship.

5. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that... The ballast water tank system consists of a seawater pump and a ballast water tank.

6. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that... The aforementioned bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles also includes a central cooling system, a material loading system, and an external fire-fighting system; the central cooling system includes a seawater pump and a large-diameter shell-and-tube seawater-freshwater heat exchanger. The material loading system includes dry bulk cargo tanks, a cargo loading deck, a towing winch, and a crane; the dry bulk cargo tanks are designed in the main hull, while the cargo loading deck, towing winch, and crane are installed on the deck. The external fire protection system mainly includes fire monitors and fire monitor pumps; the number of fire monitors is 2-4, and the power is provided by the fire monitor pumps.

7. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 2, 5, or 6, characterized in that... The seawater pump is equipped with a vortex-type sediment separation device at its front end. The vortex-type sediment separation device consists of an inlet with a filter screen, a vortex plate, a guide pipe, a diversion pipe, and a dual-outlet drain pipe. The vortex plate includes at least one set of spiral guide vanes. The diversion pipe is a pipe with open ends. The vortex plate is installed inside the guide pipe, with its front end connected to the inlet. The outer diameter of the diversion pipe is smaller than the inner diameter of the guide pipe. The diversion pipe is partially or entirely located inside the guide pipe. The inlet end of the diversion pipe is located at the rear end of the vortex plate. An outer water flow channel is formed on the outer periphery of the diversion pipe, and an inner water flow channel is formed inside the diversion pipe. The outlet end of the diversion pipe is connected to the dual-outlet drain pipe. The dual sewage outlets are connected to the outer water flow channel, and the clean water outlets are connected to the inner water flow channel.

8. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 7, characterized in that... The spiral-shaped guide vanes are in sets of 2-4; the guide tube is an acceleration guide tube, and the inner diameter of the guide tube as a whole or at the front end varies from large to small; the body of the diverter tube is a conical structure that gradually increases in size.

9. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that... The nylon sliders consist of 4 to 10 pieces, evenly spaced on the inner circumference of the hollow ring; the slider constraint ring is fixed to the vertical shaft by bolts; the elastic nylon sliders are fixed to the slider constraint ring by bolts.

10. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that, The locking sliders are two in number and are symmetrically arranged at the outer end of the pile locking mechanism. The two locking sliders are respectively connected to the two ends of the hydraulic actuator through two levers and are connected to the pile fixing hole.

11. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that... Multiple pile fixing holes are provided at intervals from top to bottom on both sides of the longitudinal surface of the hollow tube.

12. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that, The aforementioned large-scale, wide-draft, displacement-type monohull flat-bottomed hull has a beam-to-draft ratio of 5.6-10.6, a length-to-beam ratio of 3.2-4.0, an overall length of 65.0-75.0 meters, a beam of 18.0-20.0 meters, a depth of 3.8-4.5 meters, a draft of 1.9-3.2 meters, and a displacement of 2000.0-3600.0 tons. The hull plating thickness of this large-scale, wide-draft, displacement-type monohull flat-bottomed hull is 15-25% thicker than the plating thickness required by the French Classification of Shipping (LCS) steel ship specifications for ordinary multi-functional platform supply vessels. A large log is installed at the stern, with a bottom length of 0.10-0.15 times the overall hull length and a width of 0.075-0.01 times the ship's beam, and the bottom of the log is flush with the keel baseline.

13. A bottom-mounted, ultra-shallow draft, high-horsepower, multi-functional platform supply vessel with lifting piles as described in claim 1, characterized in that... The multi-propeller propulsion system includes a multi-propeller main propulsion system and a bow propulsion system; the multi-propeller main propulsion system consists of a multi-duct propeller or a multi-depth tunnel propeller connected to the main engine; the bow propulsion system consists of bow side thrusters connected to the auxiliary engine; the number of bow side thrusters is 1-2; the number of multi-duct propellers or multi-depth tunnel propellers is 2-4. The multi-duct propellers are arranged symmetrically from port to starboard at the stern of the hull, with the mid-section of the hull as the plane of symmetry. The propeller diameter is 0.5-0.7 times the draft. With the mid-section of the hull as the plane of symmetry, multi-deep tunnel propellers are symmetrically arranged in deep tunnels recessed into the hull at the stern. The propeller diameter is 0.5-0.8 times the draft, and the propeller blade tip is 0.02-0.5 times the draft above the bottom baseline.

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