Launching workboat and method for its use and calculation of hull height range

Abstract

The present invention relates to the field of ship design, and particularly to a launching workboat and a method for its use and calculation of the hull height range, including a hull, a dock, and a pedestal. A tail float is detachably arranged on the hull. The berthing area of the dock is L-shaped, and the pedestal is arranged on one side of the dock. It includes being used as a ship for transportation and as a lightering platform. It includes calculating the hull height range according to different scenarios, and finally comprehensively forming a hull height range that can meet the use requirements of multiple scenarios. Through the setting of the dock and the pedestal and the design of the hull float, the launching workboat can meet various use requirements, such as being used as a ship for transportation and as a lightering platform. At the same time, during the use process, the complex control of ballast water can be reduced, and the hull can be ensured to be stable. Through the above calculation method, the hull height range can be quickly determined, providing an accurate reference range for subsequent hull size calculation.

Description

Technical Field

[0001] The present invention relates to the field of ship design, and in particular to a launching workboat and a method for its use and calculation of the hull height range. Background Art

[0002] Existing launching workboats are workboats dedicated to the launching operation of ships, offshore facilities or offshore platform modules from the shore to the water within shipyards and / or port waters. When the object to be moved is transferred to this ship through the longitudinal and transverse tracks arranged on the launching workboat and the shore, under the action of a tugboat, this ship together with the object to be moved is towed away from the dock to a submerged deep water area (a water depth with sufficient draft requirements for the object to be moved). After meeting the operating conditions, the ballast tanks of the launching workboat are filled with water, and this ship together with the object to be moved slowly sinks until the object to be moved is in a fully floating state, and then it can be towed away from the launching workboat, thus completing the launching process of the object to be moved.

[0003] During the entire process of the object to be moved moving from the shore to the launching workboat, under the action of the gravity of the object to be moved, a great moment acts on the launching workboat, and it is necessary to transfer the ballast water in the ballast tanks of the launching workboat. Assuming that the object to be moved starts boarding and moving from the tail of the launching workboat, the launching workboat will be subjected to a moment in the counterclockwise direction of the ship length. At this time, it is necessary to transfer the ballast water in the stern ballast tank to the bow ballast tank accordingly to generate a moment in the clockwise direction of the ship length of an appropriate size to cancel it. When the entire object to be moved gets onto the workboat and continues to move forward to the bow, the launching workboat will be subjected to a moment in the clockwise direction of the ship length. At this time, it is necessary to transfer the ballast water in the bow ballast tank to the stern ballast tank accordingly to generate a moment in the counterclockwise direction of the ship length of an appropriate size to cancel it. Only in this way can it be ensured that the launching workboat remains almost level floating throughout the process, and the object to be moved can be safely placed on the launching workboat.

[0004] However, the above-mentioned ballast water transfer requires complex system design, and the entire operation process is very complex and dangerous.

[0005] At the same time, the existing launching workboats do not have the function of a barge platform. In areas with relatively shallow water depths, transport barges cannot approach the dock to load the object to be moved, and an additional barge platform design is required to meet the barge transfer requirements. In this way, the launching workboat cannot remain docked. In the case of limited dock space, it can only leave to reserve enough space for the barge platform for the transport barge to use. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: to provide a launching workboat that can meet the transportation and barge transfer functions and a method for its use and calculation of the hull height range.

[0007] To solve the above technical problem, the technical solution adopted by the present invention is:

[0008] A launching workboat, comprising a hull, a dock and a pedestal. The hull includes a deck, a bottom plate and pontoons. Pontoons are provided at the four corners of the deck. The pontoons include two aft pontoons and two bow pontoons. The aft pontoons are detachably connected to the deck. The berthing area of the dock is L-shaped, including a vertical part and a horizontal part perpendicular to the vertical part. The pedestal is arranged on the horizontal part of the berthing area and is lower than the height of the dock. The bottom plate of the hull abuts against the pedestal, and the deck is at the same height as the dock plane.

[0009] A method for using a launching workboat, comprising the following steps:

[0010] Step 1. Assemble the hull and transfer the hull to the berthing area of the dock;

[0011] Step 2. Dock the hull on the pedestal, and then transfer the ship to be launched to the deck of the hull by an axle line vehicle; thereafter, drive the hull into the designated sea area and control the ballast water to sink the hull, so that the ship to be launched floats.

[0012] A method for using a launching workboat, comprising the following steps:

[0013] Step 1. Assemble the hull and transfer the hull to the berthing area of the dock;

[0014] Step 2. Dock the hull on the pedestal, then disconnect the aft pontoons from the deck, jack up and transfer the aft pontoons through the transportation through holes by an axle line vehicle. Thereafter, a transportation barge sails into the berthing area of the dock and abuts against the vertical part of the berthing area of the dock and the tail of the hull, and then tie up the mooring ropes for fixation; then, transport the object to be lightered to the transportation barge through the tail of the hull by an axle line vehicle.

[0015] A method for calculating the hull height range of a launching workboat, comprising the following steps:

[0016] Step 1. Preset the hull height as H, and the hull height is the distance from the bottom plate of the hull to the deck of the hull;

[0017] Step 2. Preset the hull width, hull length, water density, light ship weight of the hull, weight of the ship to be launched and the height from the upper plane of the pedestal sleeper to the operating water level. Based on the parameter relationship under the condition of floating operation when the first high tide reaches the operating water level and the hull is located on the pedestal, calculate the first height range of H;

[0018] Step 3. Preset the height from the top of the seabed mud surface to the operating water level, the water surface height from the upper plane above the deck of the hull to the operating water level, and the height from the top of the seabed mud surface to the bottom plate of the hull. Based on the relationship of the above parameters under the condition that the second high tide reaches the operating water level and the hull sinks in the designated sea area and the ship to be launched above floats, calculate the second height range of H;

[0019] Step 4. Preset the ship width of the hull, the ship length of the hull, the water density, the light ship weight of the hull, the height from the upper plane of the foundation sleeper to the dock plane, the height from the upper plane of the foundation sleeper to the highest tide level, and the volume ratio of the hull ballast tank. Based on the relationship of the above parameters under the condition that the tide reaches the highest level and the hull is located on the foundation, calculate the third height range of H.

[0020] Step 5. Based on the first height range of H obtained in Step 2, the second height range of H obtained in Step 3, and the third height range of H obtained in Step 4, combine to obtain the height range of H.

[0021] The beneficial effects of the present invention are as follows: Through the setting of the dock and the foundation and the design of the hull floating box, the launching workboat can meet various usage requirements; when used as a transportation ship, the hull is docked on the foundation, and the foundation is higher than the seabed, so that the hull does not need to adjust the ballast water to meet the hull balance requirements during cargo transportation, and the hull can remain stable on the foundation; when used as a lightering platform, the hull is docked on the foundation, remains stable while releasing the tail floating box to meet the needs of cargo passage, and combined with the L-shaped design of the dock berth, it can enable the transportation ship to lean against the dock and the hull tail respectively, effectively avoiding the displacement and turning of the transportation ship during cargo transfer; through the above calculation method, the height range of the hull can be quickly determined, providing an accurate reference range for the subsequent calculation of the hull dimensions according to usage requirements such as the ballast water volume and the deck area. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the hull of the launching workboat according to Embodiment 1 of the present invention;

[0023] Figure 2 It is a cross-sectional view of the mating structure of the tail floating box, the stop block, the wedge block and the screw of the hull of the launching workboat according to Embodiment 1 of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the mating of the stop block, the wedge block and the screw of the hull of the launching workboat according to Embodiment 1 of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the mating of the hull, the foundation and the dock of the launching workboat according to Embodiment 1 of the present invention;

[0026] Figure 5 It is a schematic diagram of the stability angle of the tail floating box of the launching workboat in the front view direction according to Embodiment 1 of the present invention;

[0027] Figure 6 It is a schematic diagram of the stability angle of the tail floating box of the launching workboat in the side view direction according to Embodiment 1 of the present invention;

[0028] Figure 7Schematic diagram of the usage method of the launching workboat according to the second embodiment of the present invention;

[0029] Figure 8 Schematic diagram of the usage method of the launching workboat according to the third embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the structure when the hulls of the method for calculating the hull height range of the launching workboat according to the fourth embodiment of the present invention are respectively placed on the pedestal and submerged in the deep water area.

[0031] Label description:

[0032] 1. Hull; 11. Deck; 12. Bottom plate; 13. Float box; 131. Tail float box; 1311. Transportation through hole; 132. Bow float box;

[0033] 2. Dock; 3. Pedestal; 31. Sleeper; 4. Turnbuckle; 5. Block; 6. Wedge; 7. Screw rod;

[0034] 8. Rib plate;

[0035] 9. Ship to be launched; 10. Transportation barge. Specific implementation manner

[0036] To describe in detail the technical content, achieved purpose and effects of the present invention, the following is described in conjunction with the embodiments and with reference to the drawings.

[0037] Please refer to Figures 1 to 6 As shown, a launching workboat includes a hull 1, a dock 2 and a pedestal 3. The hull 1 includes a deck 11, a bottom plate 12 and a float box 13. Float boxes 13 are provided at the four corners of the deck 11. The float box 13 includes two tail float boxes 131 and two bow float boxes 132. The tail float box 131 is detachably connected to the deck 11. The berthing place of the dock 2 is in an L shape, including a vertical part and a horizontal part perpendicular to the vertical part. The pedestal 3 is arranged on the horizontal part of the berthing place and is lower than the height of the dock 2. The bottom plate 12 of the hull 1 abuts against the pedestal 3, and the deck 11 is at the same height as the plane of the dock 2.

[0038] As can be seen from the above description, the beneficial effects of the present invention are as follows: By setting the dock 2 and the pedestal 3 and designing the floating box 13 of the hull 1, the launching workboat can meet various usage requirements; when used as a transportation ship, the hull 1 docks on the pedestal 3, and the pedestal 3 is higher than the seabed, so that the hull 1 does not need to adjust the ballast water to meet the hull 1 balance requirements during cargo transportation, and the hull 1 can remain stable on the pedestal 3; when used as a lightering platform, the hull 1 docks on the pedestal 3, remains stable and releases the tail floating box 131 at the same time to meet the needs of cargo passage. Combining with the L-shaped design of the mooring area of the dock 2, it can enable the transportation ship to lean against the dock 2 and the tail of the hull 1 respectively, effectively avoiding the displacement and turning of the transportation ship during cargo transfer.

[0039] Further, it also includes a turnbuckle 4 and bolts. A sealing plate is provided at the bottom of the tail floating box 131, and the sealing plate is connected to the deck 11 by bolts; a plurality of first ear plates are provided on the circumferential surface of the lower end of the tail floating box 131, and second ear plates corresponding to the first ear plates of the tail floating box 131 are provided on the deck 11, and the first ear plate and the second ear plate are connected by the turnbuckle 4.

[0040] As can be seen from the above description, the bottom sealing plate of the tail floating box 131 is watertight and is connected to the hull 1 through a bolt structure. When the hull 1 is submerged in water, the water generates a positive buoyancy force on the tail floating box 131. The bolt structure can well overcome the positive buoyancy force of the tail floating box 131. However, when the hull 1 is inclined to a certain extent, or when the positioning winch above the tail floating box 131 works, the tail floating box 131 is also subjected to shear force and bending moment in the horizontal direction. The bolt structure plays a small role in overcoming the shear force and bending moment in the horizontal direction and is easily damaged.

[0041] Therefore, adopting the form of connecting the first ear plate of the tail floating box 131 with the second ear plate of the deck 11 of the hull 1 and the turnbuckle 4 can play a good role in resisting shear and bending moment, overcome the shortcomings of the bolt structure, and has a good force application form and is not easily damaged.

[0042] Further, two transportation through holes 1311 are provided on the tail floating box 131, and the transportation through holes 1311 are used for the axle truck to drive in.

[0043] As can be seen from the above description, through the two transportation through holes 1311 provided on the tail floating box 131, loading and unloading vehicles such as axle trucks can quickly enter. Then, when it is necessary to disassemble the tail floating box 131, the axle truck can jack up and transfer the tail floating box 131 in the transportation through holes 1311.

[0044] Further, it also includes a stop block 5, a wedge block 6 and a screw rod 7. 45-degree notches are provided at the four corners of the tail floating box 131. The stop block 5 faces the notches. A first inclined surface is provided on the side of the stop block 5 facing the notches. The wedge block 6 is arranged between the stop block 5 and the notches. A second inclined surface matching the first inclined surface is provided on the side of the wedge block 6 facing the stop block 5. Both the stop block 5 and the wedge block 6 are provided with screw holes matching the screw rod 7 along their lengths.

[0045] As can be seen from the above description, through the arrangement of the stop block 5, the wedge block 6 and the screw rod 7, the arrangement position of the tail floating box 131 can be quickly adjusted and the horizontal shear resistance of the tail floating box 131 can be improved. When there is a deviation between the screw holes locked by bolts of the tail floating box 131 and the screw holes on the deck 11, the distance between the wedge block 6 and the notch of the tail floating box 131 can be changed by rotating the screw rod 7 for fine adjustment. And with the cooperation of the stop block 5 and the wedge block 6 at the four corners of the tail floating box 131, after the wedge block 6 is tightened against the notch by rotating the screw rod 7, it can play a good role in resisting the horizontal shear force of the tail floating box 13.

[0046] Please refer to Figure 7 shown. A usage method of a launching workboat includes the following steps:

[0047] Step 1. Assemble the hull 1 and transfer the hull 1 to the berth 2 at the dock.

[0048] Step 2. Dock the hull 1 on the pedestal 3. Then, transfer the ship to be launched 9 to the deck 11 of the hull 1 through the axle car. After that, drive the hull 1 into the designated sea area and control the ballast water to sink the hull 1 so that the ship to be launched 9 floats.

[0049] As can be seen from the above description, when used as a ship for transportation, the hull 1 is docked on the pedestal 3. The pedestal 3 is higher than the seabed, so that the hull 1 does not need to adjust the ballast water to meet the hull 1 balance requirements during cargo transportation, and the hull 1 can remain stable on the pedestal 3.

[0050] Please refer to Figure 8 shown. A usage method of a launching workboat includes the following steps:

[0051] Step 1. Assemble the hull 1 and transfer the hull 1 to the berth 2 at the dock.

[0052] Step 2. Dock the hull 1 on the pedestal 3. Then, disconnect the connection between the tail floating box 131 and the deck 11. Lift and transfer the tail floating box 131 through the axle car entering the transportation through-hole 1311. After that, the transportation barge 10 sails into the berth 2 at the dock and abuts against the vertical part of the berth 2 at the dock and the tail of the hull 1, and then tie the mooring cable to fix it. Then, transport the object to be lightered through the tail of the hull 1 to the transportation barge 10 through the axle car.

[0053] As described above, when used as a lightering platform, the hull 1 is docked on the base 3, maintaining stability while releasing the aft pontoon 131 to meet the need for cargo passage. Combining with the L-shaped design of the berth 2 of the wharf, it can enable the transport ship to lean against the wharf 2 and the aft of the hull 1 respectively, effectively avoiding the displacement and turning of the transport ship during cargo transfer.

[0054] Please refer to Figure 9 shown in the figure, a method for calculating the height range of the hull 1 of a launching workboat, including the following steps:

[0055] Step 1. Preset the height of the hull 1 as H, and the height of the hull 1 is the distance from the bottom plate 12 of the hull 1 to the deck 11 of the hull 1;

[0056] Step 2. Preset the hull width of the hull 1, the hull length of the hull 1, the water density, the light ship weight of the hull 1, the weight of the ship 9 to be launched, and the height from the upper plane of the base 3 to the operating water level. Based on the above parameter relationships under the condition of floating operation when the first high tide reaches the operating water level and the hull 1 is located on the base 3, calculate the first height range of H;

[0057] Step 3. Preset the height from the top of the seabed mud surface to the operating water level, the water surface height from the upper plane of the deck 11 of the hull 1 to the operating water level, and the height from the top of the seabed mud surface to the bottom plate 12 of the hull 1. Based on the relationships of the above parameters under the condition that the second high tide reaches the operating water level and the hull 1 sinks in the designated sea area while the ship 9 to be launched above floats, calculate the second height range of H;

[0058] Step 4. Preset the hull width of the hull 1, the hull length of the hull 1, the water density, the light ship weight of the hull 1, the height from the upper plane of the base 3 to the plane of the wharf 2, the height from the upper plane of the base 3 to the highest tide level, and the proportion of the ballast tank volume of the hull 1. Based on the relationships of the above parameters under the condition that the high tide reaches the highest water level and the hull 1 is located on the base 3, calculate the third height range of H;

[0059] Step 5. Based on the first height range of H obtained in Step 2, the second height range of H obtained in Step 3, and the third height range of H obtained in Step 4, combine to obtain the height range of H.

[0060] As described above, by calculating the height range of H in different scenarios, the height range of H that meets multiple scenarios is obtained, providing an accurate reference range for subsequent hull 1 size calculations according to usage requirements such as the ballast water volume and the area of the deck 11.

[0061] Further, in Step 2, the preset data is calculated using the following formula to obtain the first height range of H:

[0062] ρ×B×L×H 1 ≥W + W1 , H > H 1 ,

[0063] Then H > (W + W 1 ) ÷ (ρ × B × L),

[0064] where H is the height from the bottom plate 12 of the hull 1 to the deck, B is the beam of the hull 1, L is the length of the hull 1, ρ is the water density, W is the light ship weight of the hull 1, W 1 - the weight of the ship to be launched 9, H 1 - the height from the upper plane of the pedestal 3 to the operating water level.

[0065] As can be seen from the above description, in this scenario, the height range of H under this condition is determined according to the relationship between the operating water level and the height of the deck 11 of the hull 1, and the relationship between the buoyancy and the weight of the hull 1 when the hull 1 floats in the area of the pedestal 3. Specifically, the height of the hull 1 located on the pedestal 3 needs to satisfy being higher than the height from the upper plane of the pedestal sleeper 31 to the operating water level, so that the operating water level is lower than the deck 11; meanwhile, the buoyancy under this operating water level needs to be greater than the weight of the hull 1 and the cargo weight (the weight of the ship to be launched 9) so that the hull 1 can fully float to wait to sail out of the area of the pedestal 3.

[0066] Furthermore, in step 3, the preset data is calculated using the following formula to obtain the second height range of H:

[0067] H 2 ≥ H 4 + H + H 3 ,

[0068] Then H satisfies: H ≤ H 2 - H 4 - H 3 ,

[0069] where H is the height from the bottom plate 12 of the hull 1 to the deck 11, H 2 - the height from the top of the seabed mud surface to the operating water level, H 3 - the water surface height from the upper plane of the deck 11 of the hull 1 to the operating water level, H 4 - the height from the top of the seabed mud surface to the bottom plate 12 of the hull 1.

[0070] As can be seen from the above description, in this scenario, the height range of H under this condition is determined according to the relationship between the operating water level, the seabed mud surface, the height of the hull 1, and the height between the deck 11 of the hull 1 and the operating water level, and finally the first height range of H is obtained by integrating the formula in this scenario.

[0071] Furthermore, in step 4, the preset data is calculated using the following formula to obtain the third height range of H:

[0072] H = H 码 > H潮 ,

[0073] When the tide reaches the highest water level, the buoyancy force on the hull 1 is: ρ×B×L×H 潮 ,

[0074] It is necessary to satisfy ρ×B×L×H 潮 <W + ρ×B×L×H×α,

[0075]

[0076] where H is the height from the bottom plate 12 to the deck 11 of the hull 1, B is the width of the hull 1, L is the length of the hull 1, ρ is the water density, W is the empty ship weight of the hull 1, H 码 - the height from the upper plane of the pedestal 3 to the plane of the dock 2, H 潮 - the height from the upper plane of the pedestal 3 to the highest water level of the tide, and α is the proportion of the ballast tank volume of the hull 1.

[0077] As can be seen from the above description, in this scenario, the second height range of H is determined according to the highest water level of the tide, the height of the hull 1, and the relationship between the buoyancy force of the tide and the weight of the hull 1 and the weight of the ballast water at this time; specifically, the height of the hull 1 located on the pedestal 3 needs to satisfy being higher than the highest water level of the tide so that the water level is lower than the deck 11; at the same time, since the hull 1 is used as a lightering platform, it needs to be stably docked on the pedestal 3, then it is necessary to satisfy that the buoyancy force of the tide at the highest water level is less than the weight of the hull 1 and the weight of the ballast water.

[0078] Application scenario of the present invention: During the use of a traditional launching workboat, since the moment generated by the object being transferred onto the boat will act on the launching workboat, a complex ballast water transfer system is required to control and offset the moment to ensure that the hull 1 floats horizontally. And the above-mentioned ballast water transfer requires a complex system design, and the entire operation process is very complex and dangerous. At the same time, when the transport barge 10 is loaded, due to the need to additionally construct a lightering platform, it will occupy the space of the dock 2, and the launching workboat has to leave.

[0079] Refer to Figures 1 to 6 As shown, Embodiment 1 of the present invention is:

[0080] As Figures 1 to 6 shown, the launching workboat of this embodiment includes a hull 1, a dock 2, a pedestal 3, a turnbuckle 4, bolts, a stop block 5, a wedge block 6, a rib plate 8, a screw rod 7, and a nut.

[0081] The hull 1 includes a deck 11, a bottom plate 12, a pontoon 13, and a ballast tank provided between the deck 11 and the bottom plate 12. Buoyancy tanks 13 are provided at the four corners of the deck 11. The buoyancy tank 13 includes two aft buoyancy tanks 131 and two bow buoyancy tanks 132. The aft buoyancy tank 131 is detachably connected to the deck 11. Specifically, a sealing plate is provided at the bottom of the aft buoyancy tank 131, and the sealing plate is bolted to the deck 11. A plurality of first lugs are provided on the circumferential surface of the lower end of the aft buoyancy tank 131, and second lugs corresponding to the first lugs of the aft buoyancy tank 131 are provided on the deck 11. The first lugs and the second lugs are connected by a turnbuckle 4.

[0082] For the fixed installation of the aft buoyancy tank 131, 45-degree notches are provided at the four corners of the aft buoyancy tank 131. The stop block 5 faces the notch. A first inclined surface is provided on the side of the stop block 5 facing the notch. The wedge block 6 is provided between the stop block 5 and the notch. A second inclined surface that cooperates with the first inclined surface is provided on the side of the wedge block 6 opposite to the stop block 5. Both the stop block 5 and the wedge block 6 are provided with screw holes that cooperate with the screw 7 along their lengths. A nut is provided on the screw 7 to maintain or release the movement restriction of the wedge block 6. The stop block 5 serves to limit the movement of the wedge block away from the aft buoyancy tank 131. The wedge block 6 serves to adjust and limit the movement of the buoyancy tank 13. A plurality of rib plates 8 are provided on the side of the stop block 5 away from the wedge block 6, and the rib plates 8 serve to reinforce the stop block 5.

[0083] When the aft buoyancy tank 131 is placed on the deck 11, at this time, the bolt holes of the aft buoyancy tank 131 and the bolt holes of the main deck 11 cannot be completely aligned, and the bolt structure cannot connect the two. By tightening and loosening the nuts on the screws 7 at the four corners of the aft buoyancy tank 131, the wedge block 6 slides relative to the stop block 5 and the aft buoyancy tank 131 under the action of the screw 7, and the aft buoyancy tank 131 is pressed to achieve the purpose of fine-tuning the aft buoyancy tank 13 in a certain direction.

[0084] After the aft buoyancy tank 13 is installed, the four-corner thrust blocks are in a locked state, which serves to resist the horizontal shear force of the aft buoyancy tank 13.

[0085] A spacing is provided between the aft buoyancy tank 131 and the edge of the hull 1, and this spacing forms a maintenance passage to facilitate the subsequent disassembly and installation of the aft buoyancy tank 131.

[0086] The mooring area of the dock 2 is L-shaped, including a vertical part and a horizontal part perpendicular to the vertical part. The pedestal 3 is provided on the horizontal part of the mooring area and is lower than the height of the dock 2. The bottom plate 12 of the hull 1 abuts against the pedestal 3, and the deck 11 is at the same height as the plane of the dock 2.

[0087] The base 3 is provided with sleepers 31 at intervals; the bottom plate 12 of the hull 1 is against the sleepers 31 to ensure that the force on the bottom plate 12 of the hull 1 is uniform and to prevent the hull 1 from being unable to float due to the adsorption of silt. The design of the sleepers 31 on the base 3 can ensure that the bottom plate 12 of the hull 1 is uniformly stressed; at the same time, the interval sleepers 31 can prevent the bottom plate 12 of the hull 1 from having too large a contact area with the base 3, so that the hull 1 is adsorbed by the base 3 and cannot float under the action of silt.

[0088] The bilge of the bottom of the hull 1 is designed to be in an arc shape, which can effectively prevent the bilge from scraping the base at a right angle due to the traditional right-angle design when the ship rolls, thereby reducing the scratch damage to the hull 1.

[0089] The tail pontoon 131 is provided with two transport holes 1311, and the transport holes 1311 are used for the axis vehicle to enter. The general tail pontoon 131 is relatively heavy, about 500 tons. If it is lifted off by the lifting method, it needs to be lifted off by a large lifting crane, and the operation is very complicated; while the design of the transport hole 1311 can be used to disassemble the tail pontoon 131 according to the use scenario, and then it can be lifted by the axis vehicle entering and quickly transferred; the transport hole 1311 is 3m wide and 1.5m high, which can be used for the axis vehicle to enter and adjust its posture.

[0090] like Figure 5 and Figure 6 As shown, in the transportation design of the tail pontoon 131 , the stability angle of the tail pontoon 131 is greater than 7°, so that the tail pontoon 131 is not easy to tip over when the axle vehicle transfers the tail pontoon 131 .

[0091] Reference Figure 7 , Embodiment 2 of the present invention is:

[0092] like Figure 7 As shown, the method for using the launching work boat of this embodiment includes the following steps:

[0093] Step 1. Assembling the hull 1 and transferring the hull 1 to a dock;

[0094] Step 2. Dock the hull 1 on the base 3, and then transfer the ship 9 to be launched to the deck 11 of the hull 1 by an axle vehicle; thereafter, drive the hull 1 into the designated sea area and sink the hull 1 by controlling the ballast water, so that the ship 9 to be launched floats.

[0095] In the above usage method, since the hull 1 is docked on the base 3, by ballasting enough ballast water, the hull 1 is made to sit on the bottom, and the hull 1 remains stable as a whole. During the process of transferring the ship to be launched 9 to the deck 11 of the hull 1, there is no need to perform ballast water transfer operation on the hull 1, nor is there a risk of capsizing. After the ship to be launched 9 is transported in place, the axle car is withdrawn; at the same time, part of the ballast water in the hull 1 is discharged to meet the requirement that the hull 1 can float when the tide rises to a certain water level. After the hull 1 floats, it is towed away from the base 3 area by a tugboat, transferred to the middle of the diving deep water area and rotated 90°; then the bollards on the top of the floating box 13 and the bollards of the dock 2 are connected by a cable; after that, ballast water is injected into the ballast tank to start diving. After diving to a depth where the ship to be launched 9 can safely float, the connected cable is tightened and fixed. Then the ship to be launched 9 is towed away from the deck 11 of the hull 1 by a tugboat to complete the launching operation.

[0096] Refer to Figure 8 , Embodiment 3 of the present invention is as follows:

[0097] As Figure 8 shown, the usage method of the launching workboat in this embodiment includes the following steps:

[0098] Step 1. Assemble the hull 1 and transfer the hull 1 to the mooring place of the dock 2;

[0099] Step 2. Dock the hull 1 on the base 3, then disconnect the connection between the tail floating box 131 and the deck 11, jack up and transfer the tail floating box 131 through the axle car entering the transportation through hole 1311. After that, the transportation barge 10 sails into the mooring place of the dock 2 and abuts against the vertical part of the mooring place of the dock 2 and the tail of the hull 1, and then the mooring cable is tied and fixed; then the object to be lightered is transported to the transportation barge 10 through the tail of the hull 1 by the axle car.

[0100] In the above usage method, specifically, the tail floating box 131 is removed, and enough ballast water is ballasted in the ballast tank so that the hull 1 sits on the base 3 and will not float. Then the bow of the transportation barge 10 abuts against the side of the tail of the hull 1 and is close to the dock 2 on one side, and then the mooring cable is tied and fixed. Its position is fixed by the abutting action between the hull 1 and the dock 2 and the pulling force of the mooring cable. Then the offshore platform module is finally transported from the dock 2 through the tail of the hull 1 to the transportation barge 10 by the axle car to complete the loading operation of the offshore platform module onto the ship.

[0101] In addition, when the launching workboat is not in use, the hull 1 is docked on the base 3 and enough ballast water is ballasted in the ballast tank to ensure that the buoyancy of the hull 1 is less than the weight of the hull 1 at the highest water level of the full tide, so that the hull 1 is placed above the base 3.

[0102] When a typhoon comes, the existing launching workboat floats on the water surface and is affected by the typhoon's wind and waves. The hull 1 will shake violently. If a sufficient number and strength of mooring ropes are not moored in the dock 2 area, or it is towed to an anchorage for anchoring to prevent typhoons, it may hit the dock 2 or other ships, causing huge losses. However, the bottom-sitting form of the base 3 of this launching workboat when it is not in use has a moment generated by its own weight much greater than the moment of the typhoon's wind and waves, and it is not easy to shake due to the coming of the typhoon.

[0103] Referring to Figure 9 , Embodiment 4 of the present invention is as follows:

[0104] As Figure 9 shown, the method for calculating the hull height range of the launching workboat in this embodiment includes the following steps:

[0105] Step 1. Preset the height of the hull 1 as H, and the height of the hull 1 is the distance from the bottom plate 12 of the hull 1 to the deck 11 of the hull 1;

[0106] Step 2. Preset the hull width of the hull 1, the hull length of the hull 1, the water density, the light ship weight of the hull 1, the weight of the ship 9 to be launched, and the height from the upper plane of the base 3 to the operating water level. Based on the above parameter relationships under the condition of floating operation when the first high tide reaches the operating water level and the hull 1 is located on the base 3, calculate the first height range of H;

[0107] In Step 2, the preset data is calculated using the following formula to obtain the first height range of H:

[0108] ρ×B×L×H 1 ≥W + W 1 , H > H 1 ,

[0109] Then H > (W + W 1 )÷(ρ×B×L),

[0110] where H - the height from the bottom plate 12 of the hull 1 to the deck 11, B - the hull width of the hull 1, L - the hull length of the hull 1, ρ - the water density, W - the light ship weight of the hull 1, W 1 - the weight of the ship 9 to be launched, H 1 - the height from the upper plane of the base 3 to the operating water level.

[0111] Step 3. Preset the height from the top of the seabed mud surface to the operating water level, the water surface height from the upper plane of the deck 11 of the hull 1 to the operating water level, and the height from the top of the seabed mud surface to the bottom plate 12 of the hull 1. Based on the above parameter relationships under the condition that the second high tide reaches the operating water level and the hull 1 sinks in the designated sea area while the ship 9 to be launched above floats, calculate the second height range of H;

[0112] In Step 3, the preset data is calculated using the following formula to obtain the second height range of H:

[0113] H 2 ≥H 4 +H + H 3 ,

[0114] Then H satisfies: H ≤ H 2 -H 4 -H 3 ,

[0115] where H - the height from the bottom plate 12 of the hull 1 to the deck 11, H 2 - the height from the top of the seabed mud surface to the operating water level, H 3 - the height from the plane above the deck 11 of the hull 1 to the water surface of the operating water level, H 4 - the height from the top of the seabed mud surface to the bottom plate 12 of the hull 1.

[0116] Step 4. Preset the ship width of the hull 1, the ship length of the hull 1, the water density, the light ship weight of the hull 1, the height from the upper plane of the pedestal 3 to the plane of the dock 2, the height from the upper plane of the pedestal 3 to the highest tide level, and the volume ratio of the ballast tank of the hull 1. Based on the relationship of the above parameters under the condition that the tide reaches the highest level and the hull 1 is located on the pedestal 3, calculate the third height range of H;

[0117] In Step 4, the preset data is calculated using the following formula to obtain the third height range of H:

[0118] H = H 码 >H 潮 ,

[0119] When the tide reaches the highest level, the buoyancy force on the hull 1 is: ρ × B × L × H 潮 ,

[0120] It is necessary to satisfy ρ × B × L × H 潮 < W + ρ × B × L × H × α,

[0121]

[0122] where H - the height from the bottom plate 12 of the hull 1 to the deck 11, B - the ship width of the hull 1, L - the ship length of the hull 1, ρ - the water density, W - the light ship weight of the hull 1, H 码 - the height from the upper plane of the pedestal 3 to the plane of the dock 2, H 潮 - the height from the upper plane of the pedestal 3 to the highest tide level, α - the volume ratio of the ballast tank of the hull 1.

[0123] Step 5. Based on the first height range of H obtained in Step 2, the second height range of H obtained in Step 3, and the third height range of H obtained in Step 4, combine to obtain the height range of H:

[0124] H > (W + W1 )÷(ρ×B×L), H≤H 2 -H 4 -H 3 , H = H 码 >H 潮 ,

[0125] When the height range of this H is satisfied, the hull 1 can meet the uses of the second and third embodiments above at the same time.

[0126] Finally, according to data such as the weight of the ship to be launched 9, the tide height, the height from the seabed mud surface to the dock 2, and the height from the pedestal 3 to the dock 2, a suitable H value is determined within the height range of the obtained H above.

[0127] The working principle of the present invention: By using the arrangement of the pedestal 3 and the design of the dock 2 structure, the hull 1 can be stably seated on the pedestal 3. In this way, when the hull 1 is used as a transport ship or a lightering platform, there is no need to control the hull 1 sway caused by the change in the mass on the deck 11 during use through the ballast water transfer operation of the load.

[0128] When used as a transport ship, the axis vehicle transports the ship to be launched 9 to the deck 11 of the hull 1, and then drags the hull 1 to the deep diving area, and makes the hull 1 sink by changing the ballast water in the ballast tank, and the ship to be launched 9 floats.

[0129] When used as a lightering platform, the tail floating box 131 can be disassembled, and then the axis vehicle drives into the transport through hole 1311 to lift and transfer the disassembled tail floating box 131; while the hull is stably fixed on the seated pedestal 3, the arrangement of the dock 2 structure and the hull 1 enables the transport barge 10 to lean against in multiple directions and is fixed with mooring ropes as an auxiliary, so that the transport barge 10 is very firmly docked.

[0130] At the same time, the method for calculating the height range of the launching workboat hull 1 disclosed in this application, based on the hull 1 height requirements of the above use scenarios, combines various parameters including the relationship between the operating water level and the height of the hull 1 deck 11 and the relationship between the buoyancy and the hull 1 weight when the hull 1 floats in the pedestal 3 area; the relationship between the operating water level, the seabed mud surface, the height of the hull 1 and the height between the hull 1 deck 11 and the operating water level; the relationship between the highest water level of the tide, the hull 1 height, and the buoyancy of the tide at this time and the hull 1 weight and the ballast water weight, and comprehensively obtains the hull 1 height range.

[0131] In summary, the launching workboat provided by the present invention and its method for use and calculation of the hull height range enable the launching workboat to meet various usage requirements through the settings of the dock and the pedestal and the design of the hull floating boxes. When used as a transportation ship, the hull is docked on the pedestal, and the pedestal is higher than the seabed, so that the hull does not need to adjust the ballast water to meet the hull balance requirements during cargo transportation, and the hull can remain stable on the pedestal. When used as a lightering platform, the hull is docked on the pedestal, remains stable and releases the tail floating box to meet the needs of cargo passage. Combining with the L-shaped design of the dock berth, it can enable the transportation ship to lean against the dock and the hull tail respectively, effectively avoiding the displacement and turning of the transportation ship during cargo transfer. Through the above calculation method, the height range of the hull can be quickly determined, providing an accurate reference range for subsequent hull size calculations according to usage requirements such as ballast water volume and deck area.

[0132] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A method for using a launching workboat, characterized in that, the launching workboat includes a hull, a dock and a pedestal. The hull includes a deck, a bottom plate and floating boxes. Floating boxes are provided at the four corners of the deck. The floating boxes include two tail floating boxes and two bow floating boxes. The tail floating boxes are detachably connected to the deck. The berthing area of the dock is in an L shape, including a vertical part and a horizontal part perpendicular to the vertical part. The pedestal is provided on the horizontal part of the berthing area and is lower than the height of the dock. The bottom plate of the hull abuts against the pedestal, and the deck is at the same height as the plane of the dock. Sleepers are provided at intervals on the pedestal. The bottom plate of the hull abuts against the sleepers. After the hull is transferred to the berthing area of the dock, an axle line vehicle is used to transfer the ship to be launched and adjust the floating boxes. The using method includes the following steps: Step 1. Assemble the hull and transfer the hull to the berthing area of the dock; Step 2. Dock the hull on the pedestal, then disconnect the connection between the tail floating box and the deck. The axle line vehicle drives into the transportation through-hole to lift and transfer the tail floating box. After that, the transportation barge sails into the berthing area of the dock and abuts against the vertical part of the berthing area of the dock and the tail of the hull, and then tie the mooring cable to fix it. Then, the object to be lightered is transported to the transportation barge through the tail of the hull by the axle line vehicle.

2. The method for using a launching workboat according to claim 1, characterized in that, the launching workboat further includes a turnbuckle and a bolt. A sealing plate is provided at the bottom of the tail floating box, and the sealing plate is connected to the deck by bolts. A plurality of first ear plates are provided on the circumferential surface of the lower end of the tail floating box, and second ear plates corresponding to the first ear plates of the tail floating box are provided on the deck. The first ear plate and the second ear plate are connected by a turnbuckle.

3. The method for using a launching workboat according to claim 1, characterized in that, two transportation through-holes are provided on the tail floating box, and the transportation through-holes are used for the axle line vehicle to drive in.

4. The method for using a launching workboat according to claim 1, characterized in that, the launching workboat further includes a stop block, a wedge block and a screw rod. 45-degree notches are provided at the four corners of the tail floating box. The stop block faces the notch. A first inclined surface is provided on the side of the stop block facing the notch. The wedge block is provided between the stop block and the notch. A second inclined surface matching the first inclined surface is provided on the side of the wedge block opposite to the stop block. Screw holes matching the screw rod are provided along the length direction of the stop block and the wedge block.

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