178results about "Hull panellings" patented technology

The invention belongs to the technical field of low-temperature liquid cargo storage, and particularly relates to an enclosure structure and an enclosure system at a dome corner area of a low-temperature liquefied gas storage tank, and the enclosure structure is arranged at the junction of a dome in the low-temperature liquefied gas storage tank, the top surface of a cabin and a front / rear bulkhead; comprising a corner insulation box connected to a corner, and a plane insulation box connected to a wall surface in the extension direction of the two ends; the corner area secondary-layer steel plate is attached to the inner side of the corner of the corner insulation box, and the corner area main-layer steel plate is welded to the inner side of the corner of the corner area secondary-layer steel plate through the connecting plate. The secondary shielding layer is attached to the surface of the insulation box and is welded with the corner area secondary layer steel plate; the main shielding layer is arranged on the inner side of the secondary shielding layer and is welded with the corner area main layer steel plate; and a supporting fixing plate is arranged between the two. Compared with the prior art, the problems that when an existing enclosure system structure is applied to the dome, stress is large, deformation is large, and structural stability is poor are solved. According to the scheme, the sealing performance and the use reliability of the low-temperature liquefied gas storage tank at the dome corner area are guaranteed.

The invention discloses an application method of fireproof thermal insulation materials with different fire resistance grades on an ocean vessel, and relates to the technical field of ships. The laying thicknesses of the fireproof heat-insulation materials are different according to the fire resistance grade, the material type and the ship body laying position of the fireproof heat-insulation materials. According to different fireproof grades, material types, ship body laying positions and laying thicknesses of the fireproof heat insulation materials, the fireproof heat insulation materials with different thicknesses can be arranged under different conditions, the weight and cost of the ship can be reduced, and meanwhile the heat insulation and fireproof performance is guaranteed.

Provided in the present application are a heat-insulating system of a B-type independent liquid tank, and a ship. The heat-insulating system comprises: prefabricated heat-insulating plates arranged on the outer surface of a liquid tank, wherein the side surface of each prefabricated heat-insulating plate is of a step shape; fixing assemblies arranged at joints of the prefabricated heat-insulating plates, wherein each fixing assembly comprises a fixing column and a U-shaped fixing member, two flanges are provided at the top of each U-shaped fixing member, the flanges are arranged on the stepped side surfaces of the prefabricated heat-insulating plates, and each joint between inner heat-insulating layers is filled with an elastic heat-insulating joint-filling material; heat-insulating plug blocks, U-shaped areas of the U-shaped fixing members being filled therewith; joint heat-insulating plates, each of which is arranged in a joint between adjacent outer heat-insulating layers, each joint heat-insulating plate being connected to the prefabricated heat-insulating plates, an extending overlap layer, the U-shaped fixing member and the heat-insulating plug block; and joint protection layers, each of which is laid on the upper surface of a joint between two adjacent prefabricated heat-insulating plates. The present application simplifies the product structure, shortens the design period, simplifies the mounting process, and reduces costs.

The invention discloses a fiber-reinforced resin-based composite board, a composite board component and a preparation method.The fiber-reinforced resin-based composite board comprises a first preformed body and a second preformed body, and the first preformed body and the second preformed body are matched to form a hollow structure with a cavity; the first preformed body and the second preformed body are formed by laying fiber prepregs layer by layer in different directions, so that fibers in the first preformed body and the second preformed body are distributed in different directions. According to the fiber-reinforced resin-based composite board prepared by adopting a two-step method, the porosity in the composite board can be greatly reduced, the fibers are in a straightened arrangement state, and the bearing performance or mechanical performance of the fiber-reinforced resin-based composite board is superior to that of a laminated board, a plate rib structure composite board and a pultrusion hollow structure composite board under the same thickness. The problem that in the prior art, bearing capacity, light weight and sound insulation performance of a plate, especially a vehicle body plate are difficult to consider at the same time is solved.

The invention relates to a wall (11) for a leaktight and thermally insulating vessel for storing a liquefied gas, said wall (11) comprising, in succession in a thickness direction from the outside to the inside of the vessel, a leaktight outer barrier (13), a thermally insulating barrier (14) and a leaktight inner barrier (15), the thermally insulating barrier (14) having a gas phase at an absolute pressure of less than 1 Pa and comprising:—a radiative multilayer insulation cover (47) which extends at right angles to the thickness direction, said radiative multilayer insulation cover (47) comprising a stack of a plurality of sheets which are made of metal or polymer material coated with a metal and which are separated from one another by a textile layer; and-insulating elements (51) which have an open-celled porous structure and are arranged between the radiative multilayer insulation cover (47) and the leaktight outer barrier (13).

The invention relates to a mounting process of a fireproof and heat-insulating material for A-level fireproof separation of a ship. The fireproof and heat-insulating material is flatly laid on the upper surfaces of a structural plate and reinforcing ribs in a transverse or longitudinal lap joint or splicing manner after fire resistance detection is performed on the fireproof and heat-insulating material; or the fireproof thermal insulation material is firstly and continuously laid on the structural plate in a covering manner, and the reinforcing ribs are laid in an independent coating manner; the fireproof heat insulation material is limited on the structural plate or the reinforcing rib through a touch nail, and then the fireproof heat insulation material is fixed on the structural plate or the reinforcing rib through a pressing piece in cooperation with the touch nail. The installation process is simplified, the installation efficiency is improved, the fireproof heat insulation material can be tightly attached to the ship body structure, an effective fireproof heat insulation layer is formed, the stabilizing effect of the fireproof heat insulation material can be enhanced, the safety performance of the ship can be improved, and the installation and subsequent maintenance cost can be reduced; therefore, the problems of single installation method, low efficiency, attractive appearance and installation process defects of the existing fireproof separation material are solved.

The invention belongs to the technical field of ship cabins, and discloses a ship cabin vibration and noise reduction assembly which comprises a ship cabin shell. The ventilation pipelines are arranged on the two sides of the front end of the ship cabin shell; the ventilation fan blades are movably mounted in the ventilation pipeline; the noise reduction assembly comprises a lubricating noise reduction cavity. According to the technical scheme, the lubricating oil storage barrel, the noise reduction rubber block and the power assembly are arranged, and the power assembly can drive the shielding assembly to remove blocking between the lubricating oil storage barrel and the lubricating noise reduction cavity; a part of gas in the noise reduction rubber block enters the lubricating oil storage barrel through the ventilation pipeline, the driving piston block can be pushed to drive lubricating oil in the lubricating oil storage barrel to be guided into the lubricating noise reduction cavity, so that the part, making contact with the ventilation pipeline, of the ventilation fan blade is smoothly lubricated, the friction force is reduced, and then the noise reduction purpose is achieved. And the comfort of passengers is smoothly improved.

The utility model discloses a sound-proof and fireproof light ship plate, which belongs to the technical field of sound insulation and fire prevention and comprises a plate body and glass wool. The rectangular groove is formed in one side of the plate body, the glass wool is matched with the rectangular groove and located in the rectangular groove, and glass fiber aluminum foil cloth is arranged on one side of the glass wool; according to the sound-proof fireproof light ship plate, the sound-proof layer painted on one side of the sound-proof fireproof light ship plate is matched with the sound-proof holes formed in one ends of the multiple positioning pins, so that the sound transmission path can be effectively absorbed and blocked, the sound-proof effect of the ship plate is remarkably enhanced, a more quiet and comfortable environment is created for the interior of a ship body, and meanwhile, the sound-proof fireproof light ship plate has a good sound-proof effect. And a plurality of limiting rings are mounted on the outer sides of a plurality of positioning pins, and are matched with limiting grooves formed in the glass wool, so that the position of the glass wool can be precisely limited, the glass wool is prevented from shifting or loosening in the long-term use process, and the overall durability and practicability of the sound-proof and fireproof light ship plate are better in use.

The utility model discloses a fast fastening detachable floor for a ship, and relates to the technical field of ship equipment. The floor comprises a floor body, a planking angle steel frame is arranged at the bottom of the floor body, a mounting plate is arranged on the floor body, a hasp is arranged on the mounting plate, a positioning hook is arranged on one side of the planking angle steel frame, the hasp is matched with the positioning hook, and a fixing assembly is arranged on the mounting plate. The fixing assembly comprises fixing plates arranged on the two opposite sides of the mounting plate and a bevel edge block arranged between the fixing plates on the two sides in a sliding fit mode. When the pressing block of the hasp presses the bevel edge of the bevel edge block, the pressing block of the hasp abuts against the bevel edge block, the bevel edge block is pushed backwards, so that the pressing block of the hasp is located in the containing groove and located below the bevel edge block, the pressing block of the hasp abuts against the pressing block of the hasp, and the situation that the hasp is located above the floor, and when workers inspect a ship bilge, the working efficiency is greatly improved is reduced. And the hasp is easy to loosen due to mistaken touch.

Disclosed herein is a metal scupper (1). The metal scupper (1) comprises a walled funnel (2) having an inlet (3) and an outlet (4), and internally mounted annularly therebetween to the walls of the scupper, a layer of intumescent material (6).

The utility model discloses a hull anti-corrosion coating protection device which comprises a hull anti-corrosion coating plate, and an installation groove is formed in the upper end of the hull anti-corrosion coating plate. A fixing structure is mounted on the inner side of the upper end of the ship body anti-corrosion coating plate, a first protection plate is mounted on the inner side of the lower end of the fixing structure, and a connection buffer plate is connected to the inner side of the first protection plate; the groove is formed in the middle side of the lower end of the first protection plate, a connecting block is connected to the interior of the groove, a mounting rod is connected to the outer side of the connecting block, a second protection plate is fixedly mounted at the lower end of the connecting block, a mounting block is fixedly mounted on the middle side of the lower end of the first protection plate, and a limiting rod is connected to the middle side of the mounting block; the first protection plate is connected with the ship body anti-corrosion coating plate in an attached mode. According to the ship body anti-corrosion coating protection device, protection devices can be conveniently assembled and fixed, and the protection effect on an anti-corrosion coating is good.

The invention belongs to a ship cabin structure in the technical field of ships. A ceramic wool layer is arranged on the deck (1) and comprises a framework plate (2) and ceramic wool (3), the framework plate (2) is provided with a plurality of framework plate holes (4) to form a honeycomb structure, the ceramic wool (3) is arranged in each framework plate hole (4) and covers the upper surface and the lower surface of the framework plate (4) at the same time, and a deck covering layer (5) is arranged on the upper surface of the ceramic wool layer. And a built-in enclosure bulkhead plate is arranged on the deck dressing layer (5). According to the ship cabin structure, the structure is simple, main vibration sources and noise isolation can be effectively achieved, silence and no vibration of the experiment cabin are achieved, the limitation of the arrangement position of the experiment cabin is small, an experiment can be conducted in the ship traveling period, and the requirement is met.

The utility model relates to the technical field of fire prevention devices, in particular to a cabin fire prevention and heat insulation system which comprises a fire prevention grating, a fire prevention penetrating piece, a fire prevention and heat insulation plate and a plurality of connecting assemblies, the fire prevention grating covers a first opening in the fire prevention and heat insulation plate and can rapidly expand and close the opening in case of fire, fire spreading is blocked, and the fire prevention and heat insulation effect is good. The fireproof penetration piece is arranged in the second opening of the fireproof heat insulation plate in a penetrating mode and used for arranging a cable and a pipeline in a penetrating mode and protecting the cable and the pipeline against fire damage, the fireproof protection layer comprises a first protection layer, an isolation layer and a first heat insulation layer, and the fireproof heat insulation layer comprises a core layer, a second heat insulation layer and a second protection layer; through reasonable material selection and interlayer matching, heat management is optimized, the fireproof performance is improved, a fireproof heat insulation gasket in the connecting assembly blocks heat transfer on the connecting assembly, the fireproof heat insulation plate is fixed and supported through an aluminum alloy plate, angle iron and other assemblies, and it is ensured that the fireproof heat insulation system is stable in structure and convenient to install and maintain.

This invention provides a high-efficiency ship cabin bulkhead panel, relating to the technical field of ship cabin bulkhead panels, comprising: a combined bulkhead panel and a combined locking component; the combined bulkhead panel consists of an adjustable bulkhead panel A and an adjustable bulkhead panel B, with adjustable bulkhead panel A connected to adjustable bulkhead panel B, and both ends of the combined bulkhead panel connected to two adjacent combined bulkhead panels; a rotating locking block is installed inside the adjustable bulkhead panel B, the rotating locking block being connected to the adjustable bulkhead panel A, and square grooves are provided at both ends of the rotating locking block, located on the outside of the adjustable bulkhead panel B. This invention allows for adjustment of the connection between the adjustable bulkhead panel A and the adjustable bulkhead panel B according to different cabin specifications, changing the width of the combined bulkhead panel itself, thus better adapting to the installation and use requirements of cabins of different specifications. It solves the problem that existing ship cabin bulkhead panels mostly adopt an integrated design, requiring custom-made dimensions and unable to be adaptively adjusted according to different cabin specifications, resulting in limitations in use.

The invention discloses a method for reinforcing a constrained damping coating through a honeycomb structure and a construction technology, and relates to the technical field of ship vibration and noise reduction. In the construction process of common damping paint, a selected honeycomb structure is embedded in an uncured damping coating, the embedding depth is controlled to not destroy the interface where the damping coating is tightly connected with a base body, and the damping coating is tightly bonded through the interaction of the vertical face of the honeycomb structure and the damping coating. The bottoms of the damping islands are continuous, the upper portions of the damping islands are separated by the honeycomb walls, the height of the honeycomb is controlled so that after the damping coating is completely dried, part of the honeycomb is still exposed out of the damping coating, and therefore an open type constraint structure is formed on the surface of the base body in situ. The open honeycomb structure avoids the problem that a traditional continuous restraint layer affects the drying time and the film forming strength of the damping layer. On the structure, restraint layer paint is further coated, and after the restraint layer is dried, a brand-new composite restraint damping coating is formed.

A heating plate (1) for the floor of a ship, comprising:-a metal base (3); a metal cover (2); -a polymeric support (4) arranged between the base (3) and the cover (2); -a heating element (5) adapted to generate heat upon energization and arranged between the polymeric support (4) and the cover (2); wherein the base (3) and the cover (2) form a hermetically sealed housing (10), in particular by means of a sealing material; wherein the polymer support (4) and the heating element (5) are arranged in the hermetically sealed housing (10); wherein the base (3) is provided with a peripheral side wall (31) extending laterally from a flat portion (30) of the base (3); the heating plate (1) comprises at least one temperature probe (6a, 6b) or at least one tube adapted to receive a temperature probe, passing through a corresponding first opening (36a, 36b) of the peripheral side wall (31); the respective first opening (36a, 36b) is completely blocked, in particular partially blocked by a respective temperature probe (6a, 6b) or by a respective tube and partially blocked by a sealing material.

The invention relates to the technical field of ship vibration and noise reduction, in particular to a detachable ship corridor area wall plate and bulkhead elastic connecting structure and a mounting and dismounting method. The detachable ship corridor area wall plate and bulkhead elastic connecting structure is provided with a bulkhead, a wall plate and a ceiling, the side face of the bulkhead is connected with the wall plate through an elastic noise reduction assembly, and the ceiling is connected with the upper end of the wall plate; the elastic noise reduction assembly comprises an upper elastic clamping piece, a lower elastic clamping piece, a supporting cushion block and a supporting plate, each of the upper elastic clamping piece and the lower elastic clamping piece comprises a connecting block, a wedge-shaped rubber pad and a connecting bent plate, and the wedge-shaped rubber pad of the upper elastic clamping piece is clamped on the wedge-shaped rubber pad of the lower elastic clamping piece. The device has the advantages of being simple in structure, good in noise reduction effect, capable of improving the comfort level of a ship cabin, good in working environment, beneficial to physical and psychological health of sailors and passengers and the like.

This invention relates to the field of decorative panel technology and proposes a marine decorative composite interior panel, comprising a composite panel with two grooves of different sizes on its surface. Each groove contains a matching solid wood decorative strip. Each solid wood decorative strip includes two rectangularly distributed longitudinal strips and two transverse strips, as well as silicone spacers sandwiched between the longitudinal and transverse strips. The edges of the grooves are provided with sloping surfaces. This invention, by pressing the longitudinal strips on both sides, gradually brings them into contact with the grooves. The pressing structure at the ends of the longitudinal strips moves within the insertion slots on both sides of the transverse strips, causing the two transverse strips to gradually move outwards and in opposite directions. Once the longitudinal strips are fully in contact with the grooves, the elastic force of the elastic element allows the longitudinal and transverse strips to lock into the corresponding stop portions of the grooves, thus solving the problem of slow installation efficiency in existing decorative panels.

The utility model discloses a shock absorption and noise reduction damping device for a vessel, which comprises a substrate plate, the substrate plate comprises a first panel, a second panel and a foaming rubber layer, and the foaming rubber layer is clamped between the first panel and the second panel; the end sealing ends are arranged at the two end parts of the base body plate in a sliding and sleeving manner; guide columns arranged in the length direction of the base plate are arranged at the four corners of the end of the base plate, the guide columns are sleeved with the compression springs, one end of each compression spring is fixedly connected with the base plate, and the other end of each compression spring is a free end. Through the design of the base body plate and the compression springs, the noise reduction performance and the damping shock absorption performance in the horizontal direction and the vertical direction are excellent, and the damping effect is improved; and through the design of the end socket end which slidably sleeves the end part of the substrate plate, the size is convenient to adjust to adapt to the change of the size of the mounting space, and the practicability is improved.

The utility model discloses an environment-friendly damp-proof wood plywood for ships, which relates to the technical field of wood plywood for ships and comprises a top plate formed by splicing a plurality of wood boards, connecting components are arranged among the wood boards, a mounting block is arranged on one side of the top plate, a plurality of damp-proof components are arranged on the mounting block at equal intervals, and a C-shaped supporting seat is arranged on the other side of the top plate. According to the wood plywood, the inserting columns and the connecting blocks in the connecting assemblies are matched in the rectangular grooves of the wood boards, so that the stability of connection between the wood boards is enhanced conveniently, the stability of the overall structure of the wood plywood is improved, and then the function of long-term stable use can be achieved; and through cooperation of ventilation openings in mounting blocks in the moisture-proof assemblies and drying blocks, surrounding damp air can be absorbed conveniently, the problems that traditional wood plywood glue connection is prone to loosening, the bottom face cannot effectively prevent moisture and the structure is unstable are finally solved, the using effect of the wood plywood in the ship environment is improved, and the service life of the wood plywood in the ship environment is prolonged.

The present invention relates to the technical field of enclosing systems, and discloses a thin-film enclosing system, which includes a shielding module and a heat insulation module. The shielding module includes a secondary shielding thin film layer and a primary shielding thin film layer. The primary shielding thin film layer is arranged above the secondary shielding thin film layer. A main plywood board is arranged between the secondary shielding thin film layer and the primary shielding thin film layer. An anchoring plate is fixedly connected to the top of the main plywood board. The primary shielding thin film layer is welded to the anchoring plate. A stud is fixedly installed at the top of the heat insulation module. The stud passes through the secondary shielding thin film layer and the main plywood board and is threadedly installed with a nut. The lower end of the heat insulation module is connected to the inner wall of the ship through a disassembly and assembly mechanism. The upper end of the heat insulation module is in a heat insulation and sealing state. The present invention facilitates the rapid disassembly and assembly between the heat insulation module and the inner wall of the ship through the provided disassembly and assembly mechanism, and effectively cuts off the cold bridge and reduces heat loss.

The invention discloses a cargo oil tank deck anti-corrosion heat-preservation composite structure and a construction method, the composite structure comprises a composite layer and edge sealing strips arranged on the periphery of the composite layer, and the composite layer comprises an anti-corrosion primer layer, a water-based heat-preservation layer, a grating plate, an oily heat-preservation layer and a finish paint layer which are sequentially arranged from inside to outside; the anti-corrosion primer layer is coated on the deck base material; the water-based heat preservation layer is coated on the anti-corrosion primer layer and is filled among the pores of the grating plate; the bottom surface of the grating plate clings to the top surface of the anti-corrosion primer layer; the construction method comprises the steps of deck base material surface pretreatment; spraying anti-corrosion primer; battens are arranged in a surrounding mode, and water-based heat preservation coating is poured; laying a grating plate; pouring an oily thermal insulation coating; supplementing an oily thermal insulation coating; spraying finish paint; the battens are dismantled; carrying out edge sealing treatment and the like. According to the composite structure, heat loss is remarkably reduced, the deck operation environment is improved, the durability is improved, the requirements of high temperature, high stress and marine environment are met, and an efficient and reliable anti-corrosion heat preservation solution is provided for the cargo oil tank deck.

The utility model discloses a novel water retaining structure of a decorative wallboard, which comprises a steel deck, L-shaped water retaining flat iron is fixedly connected onto the steel deck, a composite lining plate is arranged at the top of the L-shaped water retaining flat iron, a humid area is arranged on one side of the L-shaped water retaining flat iron, a terrace finished surface is arranged at the bottom of the humid area, and the composite lining plate is arranged on the other side of the L-shaped water retaining flat iron. And a sealing structural adhesive is coated between the bent top end of the terrace finished surface and the bottom contact surface of the composite lining plate. According to the utility model, the problems of difficulty in combination construction and attractiveness of the conventional linear water-blocking flat iron and the notch type composite lining plate are solved, so that the installation on a ship becomes fast, and the installation quality and the water-blocking performance are both improved; according to the floor skirting board, the installation closing opening of the skirting board can be processed more conveniently, seamless connection integration of the floor and the skirting board becomes possible, and therefore the floor skirting board is suitable for areas such as hospital areas, kitchens, catering rooms and laboratories on medical ships with extremely high cleaning requirements.

The utility model belongs to the technical field of ship cabin wallboards, and particularly relates to a light-weight sound-insulation fire-resistant ship cabin wallboard which comprises a wallboard body, splicing grooves are formed in the four corners of the rear surface of the wallboard body, the interiors of the splicing grooves extend to the exterior of the wallboard body, splicing holes are formed in the two faces of the interior of each splicing groove, and the splicing holes are communicated with the splicing grooves. A first splicing block is connected between the two splicing grooves in an inserted mode, and a second splicing block is connected between the four splicing grooves in an inserted mode. After a plurality of wall plate bodies are spliced together, the opposite splicing grooves correspond to each other, the two splicing grooves are connected through the first inserting splicing blocks, and the four splicing grooves are connected through the second inserting splicing blocks, so that the plurality of wall plate bodies can be spliced conveniently, and the splicing efficiency is improved. And after the first splicing blocks and the second splicing blocks are connected in an inserted mode, the multiple wall plate bodies are spliced through installation of the connecting assemblies and the installation holes, and therefore the multiple wall plates can be conveniently spliced, and use is convenient.

The utility model discloses a living cabin capable of reducing vibration noise of a ship. The living cabin comprises a floor, wall plates and a ceiling. The floor adopts a floating floor and is laid on the ground of the living cabin; the wall plate is of a double-layer hollow structure, the lower end of the wall plate is arranged on the floor through a wall plate bottom groove, and the upper end of the wall plate is connected with the top wall of the cabin through the hanging bracket. The ceiling is a punched sound-absorbing ceiling and is arranged on the top of the living cabin. According to the utility model, the vibration noise of the ship can be weakened, so that a comfortable working and living environment is provided for sailors, and the living quality of the sailors is improved.

Disclosed herein is a metal scupper (1). The metal scupper (1) comprises a walled funnel (2) having an inlet (3) and an outlet (4), and internally mounted annularly therebetween to the walls of the scupper, a layer of intumescent material (6).

The invention discloses an assembly type hard fireproof insulation board and a preparation method thereof, belongs to the technical field of ship materials, and aims to solve the problems that an existing insulation board is limited by space on a ship, the site is insufficient to meet the mold pouring requirement, and meanwhile, the insulation board needs to be produced and is convenient to carry out insulation integrated installation on the ship. According to the invention, through the matching arrangement of the modular insulation board and the side frame, the modular insulation board is of an assembly type, the right-angle frame is arranged at the side end, and the right-angle frame is matched with the modular insulation board, so that the side end of the assembled insulation board is kept in sealing performance, and the stability is ensured through screw connection; the glass fiber composite cloth backing avoids reduction of heat preservation performance, mildewing or corrosion of a base material after the core material in the frame piece absorbs moisture, the decorative plate is used for improving attractiveness, core material treatment, heat preservation plate filling, heat preservation plate assembling and surface treatment are arranged, core material treatment and heat preservation plate filling can be completed in advance, finally assembling and surface treatment are completed on a ship, and the service life of the ship is prolonged. The mounting effect is ensured.

A liquefied gas cargo tank is disclosed. A liquefied gas cargo tank according to an embodiment of the present invention comprises: a primary barrier including a plurality of corrugated parts of the same size but differing directional orientation, and an intersection part that is intersected by the differently oriented corrugated parts; and an insulation panel assembly surrounding the primary barrier, wherein the insulation panel assembly comprises differently angled first and second corner panels provided in the corners of the hull, and, in accordance to the angles of the first and second corner panel units, the primary barrier can be installed so as to have differing rigidity based on the orientation of the corrugated parts.