57 results about "Forecastle" patented technology

A self-propelled semi-submersible type maintenance vessel is provided with an engine room system and a propelling system, wherein the two sets of systems are respectively and independently controlled. A main deck is a flat and wide deck, and support buttresses and a crane running rail are arranged on the main deck. A crane is arranged on the rail. A water tight side tank, a steering engine room, a chain locker, an engine room, an oil tank, a water ballast space, a fresh water tank, a tool and a machining workshop, an oxygen room, an acetylene room, a waste material recycling room, a salvage equipment room, a spare part warehouse and a goods transfer device are arranged below the main deck. A forecastle is arranged. Ballast water is also loaded in the water tight side tank, and the total capacity of the water ballast space can enable the main deck of the self-propelled semi-submersible type maintenance vessel to dive 1-30 meters under water. The self-propelled semi-submersible type maintenance vessel has the advantages of having an offshore maintenance function, being capable of maintaining on the sea, capable of quickly sailing, diving, floating, loading and unloading, having functions salvation salvage and special heavy bulk transport, and being capable of being used for loading and transporting large-scale marine equipment or engineering structure works which are oversized, overweight and indivisible.

The invention discloses a method for transporting ships with a semi-submerged ship. According to the method, as shelves are additionally arranged, one semi-submerged ship can transport the ships on two layers at the same time, and transporting efficiency and economy are greatly improved; damage to hull paint in the transporting process is effectively prevented by sole timber and sea binding parts, and hull motion caused by severe sea conditions can be resisted well; cargoes which cannot be stacked can be transported conveniently, and for example, the cargoes include ships with equipment and a forecastle on a main deck and other similar goods. The shelves can be flexibly adjusted according to structural characteristics and weight distribution of the cargoes, and the application range is wide.

The invention discloses a cold water mass culture work boat which comprises a hull and an upper deck arranged on the hull. A fire protection deck and a ceiling deck are arranged above the position, located on a stern, of the upper deck. A forecastle deck is arranged above the position, located on a bow, of the upper deck. Multiple watertight transverse bulkheads are arranged below a main deck anddivide the bottom of the hull into multiple tanks including water ballast tanks, an engine room, fuel oil tanks, collection tanks, fish culture water tanks, sundry tanks, fresh water tanks, a standbyfish culture water tank and an empty tank. The fish culture water tanks and the standby fish culture water tank are formed in the middle portion of the bottom of the hull. The three collection tanks arranged side by side are formed in the tail portion of the fish culture water tanks and the standby fish culture water tank. The three fuel oil tanks arranged side by side are formed behind the collection tanks. The fish culture water tanks and the standby fish culture water tank are provided with insulating layers. The cold water mass culture work boat has the three-month non-supply production capacity on the sea, and the requirement for cold water fish culture in four seasons of a year is met.

The invention discloses semi-submersible ships capable of being combined. Each semi-submersible ship capable of being combined comprises a ship body deck and a forecastle arranged on the ship body deck, wherein the forecastle on one side of the main center line of the ship body deck is a movable forecastle capable of being detached and moving, and the movable forecastle can move to any position of the spacious deck. The invention further discloses a combined type semi-submersible ship which is formed by integrally connecting one side of the ship body deck of one semi-submersible ship capable of being combined and one side of the ship body deck of the other semi-submersible ship capable of being combined. The movable forecastles are moved to one sides of the ship body decks respectively to be close to corresponding fixed forecastles, so that the deck formed by the two semi-submersible ships capable of being combined passes through the front portion and the back portion of a stern. The combined type semi-submersible ship has the advantages that the requirement for conveying larger unconventional heavy pieces can be met, and meanwhile economic cost can be taken into consideration; the combined type semi-submersible ship can be divided into the two conventional type semi-submersible ships in the operating period when the unconventional conveying is not needed; accordingly, operating cost is reduced.

The invention discloses a longline fishing boat. The longline fishing boat comprises a boat body, a diesel main engine, a fixed pitch propeller, a longline machine, outfitting equipment, fire fighting equipment, life-saving equipment, navigation equipment, signal equipment, a power system, power distribution equipment, electrical equipment, lighting equipment, inboard communication equipment, life equipment, pollution prevention equipment and machine repairing equipment. The boat body is provided with a main deck and a navigation deck. The main deck is provided with a poop and a forecastle. The navigation deck is arranged above the main deck and provided with a cab. The longline machine is arranged on a starboard on the front portion of the main deck. A third water ballast space, a tiller room, a fourth oil bunker, a third oil bunker, a cabin, a third insulation fishroom, a second insulation fishroom, a first insulation fishroom, a second fresh water tank and a fore peak adopted as a first fresh water tank are arranged in a bilge under the main deck sequentially from tail to head. A swash bulkhead is arranged in the fore peak adopted as the first fresh water tank.

The invention relates to a new ship type for lifting and maintaining broken-down ships on the sea. The new ship type for lifting and maintaining broken-down ships on the sea is characterized in that the new ship type comprises a main hull of a ship-type platform, the main hull is a body combined by a floating dock structure and a semi-submersible ship structure, and the rear middle portion of the main hull is arranged in the form of the floating dock and serves as a dock repair operation area of the platform; a long forecastle in the form of the semi-submersible ship is arranged on the prow of the main hull and serves as an engine room, a living area and a command area; a fixing platform, a dock cabin and a continuous dock wall are arranged on the stern of the main hull. The new ship type for lifting and maintaining broken-down ships on the sea has the advantages that the new ship type combined by the semi-submersible ship structure and the floating dock structure is developed according to the characteristics of the two ship types; the new ship type has both the functions of the semi-submersible ship and the functions of the floating dock as well as has both the advantages of the semi-submersible ship and the advantages of the floating dock, personnel living cabins and functional cabins are arranged reasonably and completely, and the new ship type is good in stability in the descending process and the floating up process, and safe in operation; a real ship can be used after being built and is very good in effect.

The invention discloses a container ship. The container ship comprises a main ship body, a chain locker and a sewage well, wherein the chain locker is arranged inside the head portion of the main ship body. A forecastle deck and a second deck are vertically arranged on the head portion of the main ship body in parallel in a spaced mode. The top portion of the chain locker is flush with the forecastle deck. The sewage well comprises a top wall and a side wall connected between the outer edge of the top wall and the second deck. The top wall is connected with the bottom end of the chain locker. The top wall and the side wall connected below the top wall stretch out of the chain locker in the horizontal direction to be exposed out of the outer edge of the bottom end of the chain locker. Because the chain locker inside the head portion of the container ship and the sewage well are of a split-type structure and the sewage well expands in the horizontal direction, surrounding idle space is fully utilized on the premise that the inner diameter of the chain locker and the overall height of the chain locker and the sewage well are not increased, and requirements for the volume of the chain locker and the volume of the sewage well can be simultaneously met.

The invention relates to a fairlead device for ships. The invention relates to the fairlead device, which comprises a fairlead base and a fairlead arranged vertically thereon, wherein the fairlead base is arranged on a forecastle deck and a poop deck and extends outwards from a topside outside plate; the outer side part of the fairlead base is supported by a half-round bar arranged on the topside outside plate; the fairlead base tilts downwards along the mooring direction of the ships; and a contact part of the fairlead base and a guide rope adopts a circular arc structure. The fairlead device has the advantages that only the frictional loss of the rope can be avoided and the ship operation cost can be reduced, but also the fairlead device is more advantageous for ship mooring and increasing the security of the ship mooring. The fairlead device is refitted from the prior fairlead device so that the reconstruction cost is low.

The invention belongs to the technical field of ships, and discloses a ship balancing system. The ship balancing system comprises a transverse inclination ballast tank, a longitudinal inclination ballast tank, a connecting pipe set, an adjusting valve set and an inclination adjusting pump, wherein the transverse inclination ballast tank comprises a larboard tank and a starboard tank which are arranged on the ship body; the longitudinal inclination ballast tank comprises a bow tank and a stern tank which are arranged on the ship body; the connecting pipe group is provided with a plurality of connecting ends; the larboard cabin, the starboard cabin, the bow cabin and the stern cabin are respectively communicated with one connecting end, the adjusting valve set is connected to the connectingpipe set, the inclination adjusting pump is connected to the connecting pipe set and used for driving ballast water in the connecting pipe set to flow, and the inclination adjusting pump can be communicated with the larboard cabin and the starboard cabin or the bow cabin and the stern cabin by opening and closing the adjusting valve set. According to the ship balancing system, the whole pipeline arrangement is simple and practical, the cost can be reduced, more space can be vacated, the utilization rate of a ship cabin is increased, the ship structure is more compact, and then the comprehensive performance of the ship is improved.

The invention relates to an overall manufacture method for a forecastle bulwark of a ship. The overall manufacture method comprises following steps: 1, manufacturing of five sheet bodies by linear division based on the forecastle bulwark in the manner of bilateral symmetry; 2, manufacturing of special-purpose jig frames corresponding to line types of all sheet bodies with five jig frames in total; 3, hanging of the jig frames on a bulwark plate for planking or laminating after pass acceptance inspection of the jig frames; 4, sequential assembly and welding of a bulwark stay, a reinforcing rib and a bulwark supramarginal plate based on mounting dimensions of a framework and additional installation of reinforcing material in a proper amount; 5, independent hoisting of each bulwark sheet body for assembly and welding at the corresponding position of the ship after pass acceptance inspection of sheet bodies so that the overall manufacture of the bulwark is finished. The overall manufacture method for the forecastle bulwark of the ship has following beneficial effects: the bulwark is made in the manner from high altitude construction to grading operation so that the difficulty in manufacturing the bulwark is greatly decreased; and tandem-type construction between a conventional ship body and the bulwark is changed to be parallel construction so that the large amount of manufacture time is saved.

The invention relates to the technical field of shipbuilding and discloses a ship bow structure and a ship. The ship bow structure comprises a fore peak, an anti-collision bulkhead and a goods oil tank which are arranged below a deck and arranged in sequence. The deck comprises a bow deck and a deck body which are sequentially arranged from front to back in the length direction of the ship. The bow deck inclines upwards from the end close to the deck body to the end away from the deck body, an aviation building area is arranged above the bow deck, a long-hand room of the aviation building areais arranged on the side, away from the goods oil tank, of the anti-collision bulkhead, and the fore peak tank comprises a first cabin and a second cabin which are arranged in a spaced mode. Accordingto the ship bow structure, the bow deck is arranged to be inclined, so that the requirement for the minimum forecastle height is met, the cabin capacity of a ship goods oil cabin is increased, and waste of steel is reduced; meanwhile, the fore peak comprises the first cabin and the second cabin which are arranged at intervals, and the middle arch hydrostatic bending moment can be reduced. According to the ship, the goods oil tank capacity of the ship is greatly increased, and the middle arch still water bending moment is reduced.

A four-subarray collecting and releasing system for a geological exploration air gun source belongs to the technical field of marine geological exploration. An auxiliary cable collecting winch is arranged under a forecastle deck above a main deck, a cable fixing support is arranged from the auxiliary cable collecting winch under the forecastle deck to a stern, a cable guiding groove is formed in the stern end of the cable fixing support,, a traction winch is arranged under the forecastle deck, an array collecting and releasing slide rail is arranged under the forecastle deck, the cable guiding groove is fixed at the stern end under the forecastle deck, the cable guiding groove is connected with the cable fixing support under the forecastle deck, and the auxiliary cable collecting winch and the traction winch are fixed at the stem end under the forecastle deck. By means of the four-subarray collecting and releasing system, the air gun array collecting and releasing capacity of a Seal No. 7 air gun source ship is expanded to four arrays from two arrays, the volume of the air gun source arrays is improved, the suspension number of air guns is increased to 56 from 28, equipment accident points are reduced, and safety hazards are eliminated.

The invention discloses an assembling deice of a water spraying propelling device and belongs to the technical field of ship power equipment. The assembling device comprises a tool rack, an inflow pipeline supporting tool, a bearing pedestal supporting tool, an inflow pipeline mounting and positioning tool, a main shaft auxiliary supporting tool, a main shaft mounting and positioning tool and an assembling platform. According to the assembling device disclosed by the invention, the tool rack is arranged to support an inflow pipeline and an impeller hood; the inflow pipeline supporting tool isarranged to support the inflow pipeline; the inflow pipeline mounting and positioning tool is arranged to position the inflow pipeline axially and radially so as to reduce the assembling error of theinflow pipeline; the bearing pedestal supporting tool is arranged to support the forecastle end of the main shaft; the main shaft auxiliary supporting tool is arranged to support the forecastle end ofthe main shaft; the main shaft mounting and positioning tool is arranged to position the main shaft radially to reduce deflection of the forecastle end of the main shaft, so that a guide vane nozzleand the forecastle end of the main shaft are mounted conveniently, and the assembling efficiency and the assembling precision of the water spraying propelling device are improved.

The invention discloses a hoisting method of a bulk cargo ship bow block. The bulk cargo ship bow block comprises a forecastle deck block, a forecastle deck middle section and a bulwark section. The hoisting method comprises the steps of S1, splitting the forecastle deck middle section into a section with an outer plate and a section without an outer plate; S2, assembling the section with the outer plate, the bulwark section and the forecastle deck block to form a forecastle deck block with a bulwark; S3, hoisting the forecastle deck block with the bulwark to a dock; and S4, hoisting the section without the outer plate to the forecastle deck block with the bulwark and installing. According to the hoisting method, the forecastle deck middle section is split and then recombined with the forecastle deck block and the bulwark section, so that the maximum hoisting capacity of a workplace is utilized to the maximum extent, the total section number is increased, the hoisting number in the dock is reduced, and economic benefits are improved.

The invention relates to an integral single-segment pre-assembling method for an anchoring platform. The integral single-segment pre-assembling method includes the steps: 1) dividing the ship body ofa bow into an upper segment and a lower segment, wherein the upper segment includes a forecastle deck and the position required by installation of the integral anchor platform, and the lower segment includes a main deck except for the overall installation position of the anchoring platform; at the same time, assembling the anchoring platform, an anchor mouth and a hawse pipe into the whole of theanchoring platform, wherein the planking segmental seams at the position where the overall anchoring platform is installed, corresponding to the upper segment and the lower segment, are isosceles trapezoids; 2) constructing the upper segment and the lower segment, wherein the anchor platform is integrally mounted on the upper segment; and 3) performing a normal total assembling on the upper segment and the lower segment. The integral single-segment pre-assembling method for an anchoring platform pre-installs the anchoring platform, the anchor mouth and the hawse pipe into one segment in the segmentation stage to avoid construction of cross-segmented closing joint, that is, in the stage of segmentation, the anchoring platform, the anchor mouth, the hawse pipe and part of the main deck structure are divided into one segment together, thus having the advantages of accurate positioning, low installation difficulty and short total assembling period.

The invention relates to novel water oil gas multifunctional pontoon type overwater filling platform. The filling pontoon includes a fuel gas process area, an oil product control / living area, an oil product process area, a liquefied natural gas (LNG) process area, and an LNG control area; the oil product control / living area and the LNG control area are arranged on a poop and a forecastle respectively; a control place is arranged on a ground floor deck; and a daily life place is arranged on a second floor. Plane layout is optimized, the oil product control / living area, the oil product process area, the liquefied natural gas (LNG) process area, and the LNG control area are integrated in one filling pontoon; the filling pontoon has a fresh water filling function, an oil product filling function and a liquefied natural gas filling function; and filling / discharging pipes of the fuel gas process area are arranged on two sides, and can provide berthing and filling services for two boats to befilled at the same time.

A paddle wheel hovercraft Is characterized in that bag finger aprons are arranged on ship boards on the periphery of a hull, two fuel tanks are arranged on the left and right sides in a ship fore room, the fuel tanks are connected with a fuel hydraulic pump station through oil pipes, three main engines are arranged in a ship stern room side by side, middle shafts of main machines on the two sidesare each connected with a hovering fan, the air outlet of each hovering fan is connected with an air pipe, the middle shaft of the middle main engine is connected with a rotating shaft through a steering gear, fixed seats sleeve two ends of the rotating shaft, the fixed seats are fixedly connected into a hull cabin, paddle wheels sleeve the left and right sides of the rotating shaft respectively,and the outer edges of the paddle wheels exceed the bottom of the hull. According to the paddle wheel hovercraft technology, the high-speed paddle wheels are arranged below an air cushion of the hovercraft, the height of the air cushion is adjusted by adjusting the rotating speed of the hovering fans, so that the contact area and pressure of the paddle wheels are controlled, the defect that a flying wheel hovercraft is poor in amphibious performance is overcome, and the defects of an existing hovercraft are also overcome.

A small-sized engineering vessel belongs to the technical field of ocean engineering vessels and comprises a vessel body, a stern roller, a shark jaw, a large tow, a deck crane, a small boat crane, an external fire sprinkler, a superstructure, an anchor windlass, a forecastle deck, a small boat, a left propeller, a middle propeller, a right propeller, bow propellers, anchors, cushion tires, ballast tanks, fresh water tanks, cargo oil tanks, liquid mud tanks and ash tanks. The vessel body is formed by welding steel plates, the inside of the vessel body is provided with the plurality of tanks, the stern of the vessel body is provided with the stern roller, the anchor windlass, the large tow and the shark jaw are welded onto the main deck of the vessel body, the bottom of a bow is provided with the bow propeller, the bottom of the stern is provided with the left propeller, the middle propeller and the right propeller, the forecastle deck is provided with the deck crane, the small boat crane and the small boat, the top of the superstructure is provided with the external fire sprinkler, and the periphery of the vessel body is provided with the cushion tires. Therefore, the multifunctional small-sized engineering vessel solves the problems that vessels for offshore construction of a common concept cannot meet requirements of offshore construction, and many vessels are too single-functional and only can meet requirements of construction links of an extremely small portion and the like.

The invention relates to a venting system for a liquid tank of a ship. A first venting box and a second venting box are separately arranged in a forecastle deck cabin of the ship, and are provided with baffles for dividing inner cavities into upper cavities and lower cavities; a first lubricating oil venting pipe, a second lubricating oil venting pipe and a first engine inner cavity venting pipe are connected with the upper cavity, provided with a first venting opening, of the first venting box; a first fuel oil venting pipe is connected with the lower cavity, provided with a second venting opening, of the first venting box; a third lubricating oil venting pipe, a fourth lubricating oil venting pipe and a second engine inner cavity venting pipe are connected with the upper cavity, provided with a third venting opening, of the second venting box; and a second fuel oil venting pipe is connected with the lower cavity, provided with a fourth venting opening, of the second venting box. Venting outlets of the liquid tank of the ship are arranged in a concentrated manner, so that diffusion everywhere of oil is avoided, oil gases can be collected in a concentrated manner, the mutual movement of different types of oil gases is avoided, and the space for occupying a deck is reduced.

The invention discloses a manufacture method of a forecastle deck material of a bamboo yacht. According to the method, one black and white alternate stripe single-layer bamboo plate and a dragon spruce dimension lumber frame are combined together after the black and white alternate stripe single-layer bamboo plate is coated with glue, the black and white alternate stripe single-layer bamboo plate, the dragon spruce dimension lumber frame and the other black and white alternate stripe single-layer bamboo plate coated with glue are assembled in a compounded manner and sent into a hot press to be subjected to hot press molding after all gaps in the dragon spruce dimension lumber frame are full filled with a polyurethane foaming agent; and plate sawing, double-side fixed-thickness sanding and two-side tung oil painting are conducted, and the forecastle deck material of the bamboo yacht is manufactured after drying. The forecastle deck material, produced through the method, of the bamboo yacht can meet performance and use requirements of high-grade yacht materials, appearance is attractive and natural, the problems that glass fiber reinforced plastic composite materials adopted for the high-grade yachts at present are high in cost, difficult to recycling and process and simplex in product appearance are solved, the technology content and the product additional value of the bamboo product industry can be comprehensively improved, and wide development prospects are achieved.

The invention provides a full-electric drive self-propelled trailing suction hopper dredger with a dredging and measuring integrated system. The full-electric drive self-propelled trailing suction hopper dredger with the dredging and measuring integrated system comprises a dredger body and is characterized in that a stern mooring area, a poop, a quarter deck chamber, a mud cabin coaming, a forecastle and a bow mooring area are sequentially arranged on a main deck of the dredger body from a stern to a bow, and a steering engine room, a propulsion motor room, an engine room, a mud cabin, buoyancy cabins located on the two sides of the mud cabin, a pump cabin, a motor room, an electrical equipment room and a fore peak are sequentially arranged below the main deck of the dredger body from thestern to the bow. According to the full-electric drive self-propelled trailing suction hopper dredger with the dredging and measuring integrated system, the self-propelled trailing suction hopper dredger adopts a full-electric driving form, and can flexibly perform power distribution of a power device under different environmental conditions, different operating conditions and different index ranges. The dredging and measuring integrated system is arranged, so that the dredger has the dredging and measuring capacity at the same time, configuration of a measuring ship is reduced, the measuringwork before dredging, during dredging and after dredging is achieved by means of the characteristic that the ship is high in maneuverability, and the dredging and measuring integrated working mode isachieved.

The invention relates to the technical field of ships, aims at solving the problems that in the prior art, an anchor abandoning device is long in anchor abandoning operation time, the time effect of anchor abandoning is affected, the structure is complex and water leakage is likely to occur, and provides an anchor abandoning device, anchoring equipment and a ship. A base of the anchor abandoning device is arranged at the position, close to an anchor gear, of a forecastle deck; a plug-pin detachably penetrates through a first open slot and a second open slot of the base; the base is close to the anchor gear, the installation position of the anchor abandoning device is close to anchor gear operation personnel, and the emergency anchor abandoning reaction speed is high; meanwhile, the anchor abandoning device is arranged on the forecastle deck, water sealing treatment is not needed, and the structure is simple. The anchoring equipment comprises the anchor abandoning device, and also has the advantages that the emergency anchor abandoning response time is short, water sealing treatment is not needed, the structure is simple, operation is easy and the quick anchor abandoning can be achieved. The ship comprises the anchoring equipment, so that the ship also has the advantages.

The invention relates to the technical field of ship construction, and discloses a container ship. The container ship comprises a bow cabin, a cargo cabin area and a cabin which are sequentially arranged from front to back, the cargo cabin area comprises an outer plate, an inner bottom plate and inner wall plates located on a left board and a right board respectively, the outer plate is U-shaped, and the inner bottom plate and the two inner wall plates define a U shape and are arranged in the outer plate; the space between the outer plate and the inner bottom plate is separated in the length direction and the width direction of the ship body to form a plurality of cabins, and the outer plate and the inner wall plate are separated in the length direction and the height direction of the ship body to form a plurality of cabins; an anti-button box is arranged between the inner wall plate and the outer plate, penetrates through the cargo hold area in the length direction of the ship body and is used for arranging pipelines and cables, and a pipe tunnel is arranged between the inner bottom plate and the outer plate, penetrates through the cargo hold area in the length direction of the ship body and is used for arranging the pipelines and the cables. According to the container ship, arrangement of pipelines / cables is facilitated, the construction process is simple, the construction period is short, and the construction and maintenance cost is low.

The invention discloses a three-point anchor mooring positioning system for ship positioning operation in shallow water and an analysis method. The three-point anchor mooring positioning system for ship positioning operation in the shallow water comprises a first anchor mooring component, a second anchor mooring component and a third anchor mooring component; the first anchor mooring component andthe second anchor mooring component are both arranged on a ship forecastle deck; the third anchor mooring component is arranged on a ship aft deck; the first anchor mooring component comprises a first positioning anchor, a first anchor chain and a first anchor mooring winch; the second anchor mooring component comprises a second positioning anchor, a second anchor chain and a second anchor mooring winch; the third anchor mooring component comprises a third positioning anchor, a fairlead, a steel wire rope and a mooring winch; the first anchor mooring component and the second anchor mooring component are correspondingly arranged on the two sides of the longitudinal line of a hull; and the fairlead of the third anchor mooring component is arranged at the aft part of the ship. The three-point anchor mooring positioning system for ship positioning operation in the shallow water has the advantages of low cost and higher economic efficiency; and the positioning analysis method gives consideration to the economic efficiency and the building cost in the using process and is more flexible and economic.

The invention discloses semi-submersible ships capable of being combined. Each semi-submersible ship capable of being combined comprises a ship body deck and a forecastle arranged on the ship body deck, wherein the forecastle on one side of the main center line of the ship body deck is a movable forecastle capable of being detached and moving, and the movable forecastle can move to any position of the spacious deck. The invention further discloses a combined type semi-submersible ship which is formed by integrally connecting one side of the ship body deck of one semi-submersible ship capable of being combined and one side of the ship body deck of the other semi-submersible ship capable of being combined. The movable forecastles are moved to one sides of the ship body decks respectively to be close to corresponding fixed forecastles, so that the deck formed by the two semi-submersible ships capable of being combined passes through the front portion and the back portion of a stern. The combined type semi-submersible ship has the advantages that the requirement for conveying larger unconventional heavy pieces can be met, and meanwhile economic cost can be taken into consideration; the combined type semi-submersible ship can be divided into the two conventional type semi-submersible ships in the operating period when the unconventional conveying is not needed; accordingly, operating cost is reduced.

The invention discloses a transformation method for transforming a roll-on-roll-off ship into an inland river large-piece transport ship. The method comprises the following steps: assembling a forecastle of a left board piece body and a right board piece body at the bow end or the stern end, wherein the height of the forecastle is larger than or equal to 8 m, the distance between the forecastle and the outer edge of the bow end or the stern end is L1, and the forecastle is of a door type structure; disassembling the middle driving building of the roll-on-roll-off ship in a segmented mode; hoisting the detached middle driving building section to the forecastle, and performing mounting to form a side driving building; and arranging an anchoring platform and a mooring platform on the bow and the stern respectively, and keeping enough height between the mooring platform and a main deck so as to meet the requirement for arranging a bow chain locker, wherein an anchor chain can enter and exit from the chain locker smoothly during anchoring and weighing. An existing roll-on-roll-off ship is transformed into the inland river large-piece transport ship, an inland river large-piece transport ship berthing wharf does not need to be built again, large-piece transport can be completed through an existing roll-on-roll-off ship wharf, the problem of inland river large-piece transport is solved, and the shipbuilding cost is effectively reduced.

The invention discloses a boost ski-jump type takeoff and landing method for carrier-based aircrafts on aircraft carriers, and belongs to the technical field of ski-jump type takeoff and landing methods for carrier-based aircrafts on aircraft carriers. The boost ski-jump type takeoff and landing method has the advantages that the problems in the aspect of the thrust weight ratios of engines of totally-mounted carrier-based aircrafts on existing aircraft carriers during ski-jump type takeoff can be solved by the aid of the boost ski-jump type takeoff and landing method, and the carrier-based carriers can be effectively and safely landed; high-power air compressors which can be manipulated by laser trackers are arranged under parabolic warping forecastle decks of the aircraft carriers, high-pressure airflow can be generated by the high-power air compressors, and the carrier-based aircrafts with thrust components can be boosted to be taken off; certain elevation angles are formed from starting points to end points of landing decks with the aircraft carriers, electromagnet sets are mounted on glide tracks, and the speeds of the carrier-based aircrafts with brake warping plates can be reduced by the high-pressure airflow, so that the carrier-based aircrafts can be landed; principles for the boost ski-jump type takeoff and landing method are simple, facilities for the boost ski-jumptype takeoff and landing method are simple and are reliable in performance, and the fully-mounted large carrier-based aircrafts, carrier-based early warning aircrafts and heavy fighter aircrafts can be safely taken off from the aircraft carriers and can be safely landed on the aircraft carriers.