NO133065B - - Google Patents

Description

The present invention relates to a device for a container for the transport of liquefied gas, and in particular the attachment of sealing walls and insulation layer to a thermally insulated, non-self-supporting liquid tank for ships.

French patent no. 1 438 330 describes a tight and isothermal container built into the load-bearing structure of a ship and consisting of two successive sealing walls, the first in contact with the transported liquefied gas and the second placed between the first wall and the vessel's hull , as the two walls alternate with two thermally insulating layers which are hereafter referred to as insulating walls. In the design described, the second insulating wall consists of boxes filled with an insulating material and attached directly to the ship's double hull or double bulkhead. The boxes are permeable to gas and arranged so that there is a free space between the boxes and thereby free circulation of gas. The second sealing wall consists of thin metal plates with raised edges inward into the hull and whose height is mainly equal to the height of the aforementioned insulation boxes and which are attached to each other by welding. Fastening the plates to the insulation wall is done with sliding joints. The first insulating wall also consists of boxes filled with insulating material, and similar precautions as taken for the second insulating wall allow free circulation of gas. The boxes are attached with screws to a series of vertical metal profiles placed between vertical rows of boxes. The profiles are again attached with support pieces that are tightly threaded through

the second sealing wall with boilers fixed from place to place along horizontal wooden beams which are carried and fixed from place to place on

jacks welded to the supporting hull. The first sealing wall, like the second, consists of plates with raised edges with a height essentially equal to the height of the insulation boxes, the plates being joined together by welding in the same way as for the second sealing wall, and the plates being attached to the insulation wall with sliding joints.

It has been found that the design of a container as described in French patent 1,438,330 exhibits problems arising from the construction of the mechanical connections between the two sealing walls and the supporting hull of the vessel. In particular, the front insulation wall and the corresponding sealing wall are mechanically integrated with the vessel's double load-bearing hull through vertical profiles (connected to horizontal beams by anchoring devices which are fast through the second sealing wall). It is clear that the design of these mechanical connections comprising horizontal beams and vertical profiles is rather complicated and therefore expensive. This also applies to the tight passage through the second sealing wall of the anchoring devices

which connect the beams and the aforementioned profiles.

The purpose of the invention is to remedy the above-mentioned deficiencies by, firstly, ensuring a mechanical connection between the second wall and the ship's double load-bearing hull, and secondly, ensuring an elastic, mechanical connection between the first insulating wall and the second insulating wall without the connections need to be made through the metal plates that make up the second sealing wall.

This is achieved according to the invention by an attachment of sealing walls and insulation layer to a thermally insulated, non-self-supporting liquid tank for liquefied gas for ships, which tank consists of a first sealing wall that forms the inner wall of the tank as well as a first thermal insulation layer connected to the sealing wall, and a second , sealing wall and a second thermal insulation layer, and where the second insulation layer is attached to those of the ship's walls that form the cargo hold, and where the insulation layers are composed of insulation blocks to which sealing walls formed or, consisting of thin tin plates are attached, whereby between parallel, adjacent edges of the plates in the sealing walls bent towards the interior of the tank are welded into a fastening strip that protrudes into the insulation layer behind the sealing wall and which is attached to the insulation blocks by means of a sliding connection that can be moved along the edges, in that the new and characteristic thing is that the first isolation slayer is attached to the second sealing wall by means of suspension elements that act vertically on the plane of the insulation layer, and holder parts which are arranged at a distance from each other and are attached to the fixing strip or to the bent edges of the plates of the second sealing wall which are welded together with this.

In a first embodiment of the invention, the metal wing which serves for edge-to-edge welding of the metal plates in the second, sealing wall is the central element in a composite beam, said element over part of its width being sandwiched between two laths, e.g. prepared from wood, as the sliding assembly is due to the aforementioned composite beam being inserted between two adjacent insulating boxes in the second insulation wall so that the laths in the composite beam are held firmly in the direction inward into the container by means of elements attached to the boxes in the second insulation wall . In another design, the sliding assembly of the metal wing that serves for edge-to-edge welding of the metal plates in the second sealing wall consists of a sliding joint formed by the folded edge of the metal wing and the oppositely folded edge of a metal band attached to the edge of one horizontal surface of each box in the other insulating wall, as the horizontal batten which forms a support for the rebates laid in the sliding joint by the roof, is inserted between the sliding joint and the rebates of the insulating box, which is not provided with the above-mentioned metal band, as the assembly of the sliding joint and the batten which forms the plant is placed in a longitudinal extension formed in the edges of the horizontal surfaces of each case in the second insulation wall. In both designs, the metal wing to which the plates in the second sealing wall are welded preferably consists of a strip of sheet steel with a high nickel content and preferably invar.

In a preferred variant of the former design, the laths that clamp the central wing in each composite beam are made of wood and cut into equal-sized pieces, the pieces in the upper and lower battens being precisely aligned, and two successive pieces being separated by a space in which the composite beam is reduced to its central wing. The elements that are attached to the boxes in the second insulating wall and ensure the holding of the laths in each composite beam, are strips that are attached along a protruding edge of each insulating box. The laths in the composite beam are attached to the central wing by means of pins.

In a preferred variant of the second design, they comprise insulating boxes in the second insulating wall, inside and . along the horizontal edge on which is attached the pleated band I which forms part of the attaching sliding joint, a reinforcing joint which may possibly consist of several elements distributed side by side over the entire length of the box. Fastening to the box of the folding band which forms one of the parts in the sliding joint for the other wall is done with the help of screws which are fed through the wall of the insulating box and penetrate into the reinforcement strips placed inside the box. Each box in the second insulating wall comprises two horizontal surfaces which are extended inwards into the box, past the perpendicular vertical surfaces of the vessel's double hull or double bulkhead, each of these extensions, in the vicinity of the hull or bulkhead, carrying an anchor strip attached to the extension, for example by folding or gluing. The four anchoring strips adjacent to the four insulation boxes that butt against the second insulation wall are held, in relation to the double hull or the double bulkhead, in place by means of a fastening consisting of two angles, a floy on each angle being fixed with a threaded bolt and nut to the hull or bulkhead, and since the other two sections are connected to each other by bolting. The floes on the angle that are parallel to the keel ridge are folded perpendicular to the floes.

For other of the aforementioned designs, additional dispositions can advantageously be used. The fastening boyles comprise two wings which clamp the metal wing between them, on both sides of which the curved edges of the metal plates in the other sealing wall are assembled, as mounting of the boyle on the metal wing is realized either by welding or riveting. The fastening means connected to each bdyle consists of a threaded rod, a nut and a locking washer, the washer resting against a box in the first insulation wall. The locking disc in the fastening means which is attached to each boyle rests in a recessed zone arranged in a corner of the parallelepiped insulating box, as it simultaneously rests against four deepening corners of adjacent insulating boxes in the first insulating wall.

In order to realize the elastic connection element that connects the fixing boy with the fixing agent that cooperates with the insulating boxes in the first insulating wall, several different designs can be used. In a first construction, the elastic connecting element consists of an elastically deformable metal ring which is connected in one of its areas to the boyle and in the opposite area to the threaded rod in the corresponding fastening means. In this case, the elastically deformable ring is placed in the plane of the metal wing, on which it is fixed, or in a perpendicular plane. In another construction, the elastic connection element, which is inserted between the fixing boy and the fastening means that cooperates with the insulating boxes in the first insulation wall, consists of two metal rails that are welded to the fixing boy, and the other rail to the threaded rod in the corresponding fixing means, the contact plane of the rails is parallel to the planes of the first and second sealing walls. In a third construction, the elastically deformable element consists of a U-shaped leaf spring whose one branch is connected to the aforementioned boilers and whose other branch carries a threaded bolt for fastening the insulating boxes in the first insulating wall. In this case, the fastening of the U-shaped spring to the boilers connected to the second sealing wall is preferably carried out either with rivets or with the help of pins that are fast through the boilers

and a wing on the U-spring, as the pins are locked by a steel splinter.

It can be seen that the container according to the invention exhibits significant advantages compared to the previously described device. It entails a simplification of the fastening means which ensure the mechanical connection between the double load-bearing hull and the first and second insulation and sealing walls. It is not .

it is no longer necessary to use the horizontal beams and vertical profiles that were previously required. These simplifications result in a significant reduction in the assembly time for the various elements in an integrated container for the transport of liquefied gas. Furthermore, it can be seen that the mechanical attachment method used in the device according to the invention results in a very significant reduction of the thermal bridges formed by the mechanical connection elements which ensure attachment of the container's elements to the vessel's double supporting hull. And finally, the omission of the horizontal beams and vertical profiles results in a significant reduction in the weight of fasteners per square meters of internal surface of the container. These dispositions further ensure, like those described in French

patent no. 1 438 330, for the first the sliding connections between underlying sealing and insulation walls, for the

other that the insulating boxes remain. permeable. for gas, finally jog that there are open spaces between the boxes, which allow free circulation of the gases.

It can be noted that the second design of the container according to the invention described above has three advantages compared to the first design. Firstly, the cross-section of the fastening zone which is arranged at each end of the boxes in the second insulation wall is increased, which allows an increase in the forces on the fastenings. Secondly, in the longitudinal extensions, arranged bearing for the sliding joint that keeps the metal wing in height with the joining planes between the boxes in the second insulating wall, it allows to avoid spaces between the horizontal surfaces of the insulating boxes, thereby again avoiding the introduction of an additional insulating material. Finally, and thirdly, the attachment, which includes two boyle tabs, is carried out at each connection of four adjacent boxes in the second insulation wall, with the help of two . bolts attached to the vessel's hull or bulkhead. This provides security in the event of one bolt breaking, and further allows adjustment during assembly.

Finally, the invention aims at a new industrial product which is made up of a vessel intended for the transport of liquefied gas, and in particular for the transport of natural, liquefied gas with a high methane content, characterized in that it comprises at least one integrated container as stated above.

For a better understanding of the invention, it shall now be described as purely illustrative and non-limiting examples, as different designs are shown on the attached drawings, where: Fig. 1 shows, in perspective and with cut away parts, the assembly of the first and second sealing walls, the first and other insulation walls, and the vessel's double supporting hull, Fig. 2 in perspective shows, for the container in fig. 1, a detail of the attachment of a boyle to the assembly formed by the center wing of a composite beam and the bent edges on a metal plate mounted on the center wing, the corresponding elastic connecting element being a ring perpendicular to the plane of the center wing,

!

Fig. 3 in detail and section shows the attachment to the supporting hull of the insulating boxes in the second wall in fig. 1, as a composite beam is inserted between two superimposed, adjacent boxes in the other Fig. 4 shows a detail of fig. 1, seen in section, namely the fastening by riveting of the fastening boyle to the assembly made up of the middle wing in the composite beam and the two bent-up edges that are welded to the wing, Fig. 5 in perspective shows another design of the fastening of a boyle to the composite beam in fig. 1, the elastic connecting element being a ring arranged in the plane of the center wing of the composite beam, Fig. 6 in perspective shows a variant of the elastic connecting element, consisting of two joined metal rails which are welded at the ends, Fig. 7 in section shows a detail of the raised edges on the front sealing wall, the assembly being carried out by welding on each side of a central metal wing attached to the boxes in the front sealing wall by means of a sliding joint, this layout being the same as that in fig. 1 showed the first variant and the one in fig. 8 showed another variant, Fig. 8 in perspective with parts cut away, and for another design of the container according to the invention, shows the assembly of the first and second sealing wall, the first and second insulating wall and the double hull, Fig. 9 in perspective shows a detail of the attachment of it to the second insulating wall in fig. 8 connected to the metal wing, the insulating boxes being cut off and empty, Fig. 10 in perspective and detail shows the attachment of one insulating box to the other. wall in fig. 8 on the double be-

running hull,

'Fig. 11 in section shows the sliding joint in fig. 9,

Fig. 12 in section shows the attachment in fig. 10,

Fig. 13 in detail and in section shows the U-shaped spring which in the design in fig. 8 ensures the connection between the metal wing attached to the second wall and the insulating boxes in the first insulating wall,

Fig. 14 shows a section along the line XIV-XIV in fig. 13.

Referring to the drawings, and in particular fig. 1 - 5 and 7,

is shown in 1 the double supporting hull of the vessel, and in 2 the threaded bolts welded to the hull 1 perpendicularly thereto. The bolts 2 are welded on in vertical rows, with their distance within one and the same row corresponding to the height of a parallelepipedic square box 3 which is intended to form the second insulation wall 300. The distance between two adjacent rows of bolts 2 determines the length of the boxes 3, which are arranged so that there is a bolt 2 in each of their corners. The boxes 3 are e.g. of wood, and contains a heat-insulating material, preferably the product known under the commercial name PERLITE. 3a is the surface of the boxes 3 that abuts the hull 1, and 3b the opposite surface. Each box 3 comprises vertically on each side of the surfaces 3a strips 4 which are attached to the vertical side surfaces of each box 3. In the joining area for four boxes 3, there is a space between the boxes 3 that allows passage of the corresponding bolt 2. The end of the bolt 2 is threaded and cooperates with a nut 2a which rests against a square locking disc 5. Each locking disc 5 thus allows the simultaneous fastening of four corners of four adjacent boxes. The horizontal surfaces of the boxes 3 are designated 3c and 3d. The surfaces 3c and 3d carry, in the area where they abut the surface 3b, strips 6 fixed along the entire length of the boxes 3. The boxes 3 are stacked on top of each other along the hull 1 between the rows of bolts 2 and fixed to the hull 1 by means of the washers 5 which rests against the strips 4 of four adjacent boxes 3. The spaces between the boxes 3 are filled with stone wool to effect thermal insulation,

Between two horizontal rows of the boxes 3 there is placed a composite beam which is designated as a whole 7. This composite beam consists of a central wing 8 which over part of its width is clamped between two wooden laths 9 arranged along one edge on wing 8 and attached to this. The laths 9 are cut into pieces, with two consecutive pieces separated approx. 20 cm. Each stump has a length of approx. 1 meter. The upper and lower batten pieces are precisely superimposed, so that the composite beam 7 has areas where there is no batten 9. The middle wing 8 consists of a thin strip of invar. This device allows the beams 7 to be stored by rolling them up, the areas where there is no batten allowing sufficient buoy to ensure such rolling up. The composite beams 7 are placed between the surfaces 3c and 3d on the two boxes 3 which are placed one above the other, the battens 9 being placed in relation to the strips 6 on the same side as the hull 1. The wing 8 is then inserted between the two strips 6 on two superimposed boxes 3 and holds the beam 7 with a force which is exerted inwards into the container.

When, by setting up the boxes 3, a wall has been formed which forms the second insulation wall 300, smooth metal plates with curved edges 11 are placed on the surfaces 3b of the boxes 3 which form the second sealing wall 100, the distance separating the two curved edges 11 on the same metal plate 10 is equal to the distance that separates two consecutive middle wings 8 in the second insulation wall 300. The attachment of the curved edges 11

on two plates 10 arranged one above the other, is carried out by automatic welding, the edges 11 between them clamp the wing 8 on the composite beam 7 and the welding thus joins three thicknesses of metal in a welding area 1a. Between two vertical rows of bolts 2, there is, on the edge of the central wing 8 which forms a projection inwards into the container, a mainly trapezoidal outlet 12, which extends all the way to the area where the curved edges 11 of the metal plates' 10 are located.

In the plane of the extensions 12, perpendicular to the hull 1 and the second sealing wall 100, there is a boiler 13 arranged in the middle area of the boxes 3, between whose two wings the assembly formed by the wing 8 and the welded upturned edges 11 is inserted.\ The boiler 13 is attached to it either by welding or riveting, the latter solution being shown in fig. 4, where the fastener is. denoted 14... Each boy le 13 is, by means of an elastic device, which will be described later, connected to a rod 15 threaded at its end, a nut 15a cooperating with the threads and resting against a locking washer 16. Between the assemblies formed by a boyle 13, its rod 15 and disc 16, wooden boxes 17 are placed there, each box being placed so that one of the assemblies 13-15-16 is located in each of the box's corners. The boxes 17 are completely analogous to the boxes 3 which form the second insulating wall, and make up the first insulating wall 170. The boxes 17 rest on each other, have self-supporting wooden walls and are filled with an insulating material known under the commercial name PERLITE. The boxes 17 are provided in each corner with extensions which form a bed for the assembly 13-15-16, as there is a mounting surface for it. to cooperate with a quarter of the locking washer 16. The washer 16 thus secures the attachment of four adjacent corners belonging to four boxes 17 in the first insulation wall 170.

17a denotes the surface of the box 17 which is located opposite the second sealing wall 100 which consists of the plates

10, and with 17b the opposite face. The boxes 17 have upper and lower horizontal surfaces 17c and 17d. In the surface 17d of each box 17, along the area where the surfaces 17b butt together, extensions 18 are arranged which form a bed for an anchoring band 19 which is folded flat around itself and attached to the surface 17c of the box 17 which is located itself below the considered allowance zone. The bands 19 are attached to the surface 17c by means of staples 20. A pleated band 21 cooperates with the band 19, the rear part of which engages in the fold of the band 19 as shown in fig. 7. The band 21 forms a projection inward into the container along the horizontal joining planes of the box 17.

On the surfaces 17b of the boxes 17, a first sealing wall 220 consisting of metal plates 22 with bent edges 23 is placed. The width a and the plates 22 are essentially equal to the height of the boxes 17, so that the bent edges 23 of the plates 22 come on each side of the belt 21 , which forms a projection, outside the horizontal connecting plane between the boxes 17. The bent edges 23j and the band 21 are welded automatically, whereby a continuous first sealing wall 220 is achieved on the surfaces 17b of the first insulating wall 170. The mechanical fastening of the first sealing wall 220 The first insulating wall 170 is lined in a sliding manner using the bands 21 and 19 and the pins 20. The metal plates 22 consist of stainless steel sheet.

It is thus seen that one can realize an integrated container placed inside a vessel, as all elements in the container are attached to the vessel's inner, smooth hull, as it is of course understood that the ship's frame system is enclosed between the outer and the inner or double hull 1 The mechanical attachment of the boxes 3 to the hull 1 is carried out by means of bolts 2 provided with washers 5 and nuts 2a, the washers 5 resting against the slats 4. The second sealing wall is attached to the second insulation wall by means of the wings 8 on the assembled beams 7, which wings are welded to the bent edges 11 of the plates 10. The fastening of the boxes 17, which make up the first insulating wall, to the elements of the second wall is carried out with the help of battens 9 which are blocked by the strips 6, the wing 8 attached to the battens 9 , boiler 13 attached to the wings 8

and disks 16 attached to the boyles 13. Attaching the plates 22, which form the first sealing wall, to the first insulating

wall is lined in a sliding manner using bands 21 and 19

and the pins 20. The assembly of the elements that make up the integrated container is then completely fixed in relation to the hull 1.

It should be noted, however, that because of the high temperature gradient that must be established through the assembly of the elements in the container during freezing and because of the contraction during loading of the container, it is absolutely necessary to allow some movement between the elements in the front and second walls, all while maintaining cohesion between the two walls. To achieve this, elastic connection elements are inserted between the boyles 13 and the rods 15. In fig. 2, 5 and 6 show three different types of elastic connection elements that can be used.

In fig. 2, boy len 1.3, in the area opposite to that where the edges 11 of the plates 10 are attached, is provided with a hole 24 in which a ring 25 whose plane is vertical is received, the ring 25 being welded to the rod 15.

In fig. 5, the boylen 13 consists of a folded band whose bottom 13a is designed to receive a horizontal ring 26 which is passed through the end 15b of the rod 15 by means of a hole 21'. In these two designs are seen. the fact that, during freezing and loading of the container, a deformation of the rings 25 and 26 can occur without the attachment between the elements in the first and second wall being undone.

In fig. 6 shows a third variant of the elastic connecting element. In this variant, the boylen 13 is welded to a vertical metal rail 28, which is attached to another metal rail 29, which in turn is welded at its end to the rod 15. The rails 28 and 29 are only welded together at the ends, the welding being designated with 30. When a tensile force is applied to the rod 15, for example during freezing of the container, the rails 28 and 29 bend with opposite convexity, thereby forming a spring. The advantages of this arrangement are the same as those indicated above for the rings 25 and 26.

It should be noted that in the device according to this first variant of the invention, all the spaces that occur between the boxes 17 or the boxes 3 are filled with a porous insulating material such as, for example, rock wool, to ensure free circulation of the gas.

With reference to. fig. 8 - 13, which relate to another design of the invention, is seen in 31 the vessel's double hull,

in 32 threaded bolts welded to the hull 31. perpendicular to this. The bolts 32 are welded in vertical rows and distributed in groups of two, the distance between the centers of two consecutive groups within the same row corresponding to the height of one. square, parallelepiped box 33 which forms the second insulating wall. The distance between two adjacent rows of bolts 32 determines the length of the boxes 33 which are placed so that in each corner of these there is a group of two bolts

ter 32. The boxes 33 are for example made of wood. They contain a thermally insulating material, preferably the product known under the commercial name PERLITE. The surfaces 33a of the boxes 33 face the hull 31, and the opposite surfaces are designated 33b. The 33 horizontal surfaces of the boxes are designated 33c and

33d, and project outside the boxes 33 past those of the boxes' vertical surfaces which are perpendicular to the hull 31. These extensions are designated 34. Near the hull 31, and in the direction of the middle part of each box, each extension 34 is provided with a fastening strip 35 which is bolted to the extension 34 and is of approximately the same width as this.

The boxes 33 are stacked on top of each other along the hull 31 between rows of bolts 32, and are attached to the hull by means of fastening leeches consisting of angle lugs 36. Each lug 36 comprises two vertical floats, one 36a arranged parallel to the hull 31 and the other 36b perpendicular to this. The edges of the floys 36a and 36b which are opposite the stop 36c are bent perpendicular to the floys 36a and 36b, and these edges are designated 37a and 37b respectively. The length of the floy 36b is somewhat smaller than the length of the attachment strip 35. Each lug 36 is attached to the hull by means of a bolt 32 and a nut that cooperates with this, the two lugs 36 in the same fastening correspond to two bolts 32 in the same group in the same vertical row. The two paws 36 are attached to each other by means of a bolt 38 perpendicular to the paws. The edges 37b of the two lugs 36 in the same fastening block at the same time the ends of four fixing strips 35 belonging to four adjacent insulating boxes 33 in the second insulating wall 300. The surfaces 33c and 33d of two boxes are stacked on top of each other practically without gaps, and abut against each other . In contrast, the surfaces which are perpendicular to the hull 31 are spaced a distance somewhat greater than twice the width of an extension 34.

On the surfaces 33c and 33d in each box in the second insulation wall 300, in the vicinity of the surface 33b, a longitudinal extension 38 is arranged. Beyond the extension 38 and inside the box 33, a reinforcement strip 39 is arranged along the entire length of the box, in several elements, to allow passage for the inner transverse walls 40 in the boxes 33. The reinforcement strips 39 are attached to the boxes 33 with staples or by gluing. The two extensions 38 on adjacent boxes 33 are placed opposite each other and "delimit a space where, firstly, a sliding joint consisting of a band 41 and a metal wing 42 has been placed, and secondly, a stiffening rail 43. The band 41 is attached to the box 33 with screws 44 which pass through the surface 33d of a box and insert into the strip 39 which is placed above the extension 38. The edge of the band 41, which is placed towards the outside of the box 33, is folded 180°. The metal wing 42 is attached to the fold of the band 41 by means of

an analogous 180° fold, as the assembly of the two folds laid by the roof constitutes the sliding joint which secures the attachment of the metal wing 42 to the insulating box 33 in the second insulating wall 300. In order for the metal wing 42 to be subjected to a significant stretch perpendicular to the hull 31, it must be avoided that the two folds on the sliding joint can open. For this purpose, the rail 43 is placed between the sliding joint and the bottom of the extension 38 which is arranged on the box 33 which abuts the one where the band 41 is attached. It can then be seen that the metal wing 42 has been attached to the boxes in the second insulation wall 300 without it having been necessary, between the opposite surfaces 33c and 33d, to arrange any voids.

When, by placing the boxes 33 one above the other, a wall has been formed which forms the second insulation wall 300, smooth metal plates 45 with curved edges 46j are placed on the surfaces 33b of the boxes 33, the distance separating the two curved edges 46 on the same metal plate 45 being equal the distance that separates two consecutive metal wings 42 on the second insulation wall. The fastening of the bent edges 46 on the two plates 45, one above the other, is done by automatic welding, the two edges 46 between them clamping the wing 42 and the welding thus attaches three thicknesses of metal in a welding area 46a.

Between two consecutive vertical rows of bolts 32, a boyle 47 is attached to the metal wings 42 by automatic welding

in the welding zone 47a. Boylen 47 can consist of two cans arranged

on each side of the wing 42 and mutually welded not only in the welding zone 47a, but also in a parallel welding zone 47b along the opposite longitudinal edge of the cans. Every' boyle 47 is

through an inverted U-spring 48 connected to a rod 49 threaded at the end, a nut 49a cooperating with the threads, and the nut resting against a locking disc 50. Between the assemblies formed by a boyle 457, its rod 49 and the disc 50, wooden boxes 51 are placed, each box being placed so that one of the assembly's 47-49-50 is in each corner. The boxes 51 are completely analogous to the boxes 33 which make up the second insulating wall 300, and themselves form the first insulating wall 170. However, firstly, they are not provided with lateral extensions analogous to the extensions 34, and secondly, in this case, the longitudinal extensions which are arranged on the upper and lower surfaces of each box only arranged on the lower surfaces. The latter difference can be seen from fig. 8 which shows in cross-section the connecting area for the boxes 51. The boxes 51 are identical to the boxes 17 in the first variant, and are assembled as shown in fig. 7, as the elements in the boxes are the same, and as only the reference numbers corresponding to each element have changed. As described for the first variant, a sliding joint with roofed folds allows attachment in the joining plane of a metal band 55 on each side of which the metal plates 56 with bent edges 57 are welded. The metal plates 56, like the plates 45, are made of invar. For more details, refer to the described structure of the first insulating wall and first sealing wall in the first variant.

The inverted U-spring 48 consists of a rail of cold-resistant

metal with a high elastic limit and bbyd in U shape. One end of this rail is attached to a plate 48a which at the same time rests on the bent edges 46 and the boylen 47. The plate 48a is attached to the boylen 47 with bolts 48b which are fed through the plate 48a and the boylen 47 and which are held in place by means of a stainless steel splinter 48c. The spring 48 can be elastically deformed vertically on the hull 31, which allows movement in this direction of the first wall in relation to the second wall. Manufacture and assembly of this elastically deformable element is simple and cheap.

It can be seen that in this way one can realize an integrated container placed inside a ship, as all the elements of the container are attached to the ship's inner, smooth hull, it is understood that the ship's frame system is enclosed between the outer hull and the interior, or double hulls 31. The mechanical fastening '■i 'of the boxes '33 to the hull 31 is carried out by means of bolts 32 <1>

-• <.<,..-.,.. , ;•>'*•.

and fixing tabs 36 which rest against fixing strips - 35.''

•■>-• •• Vy> i- '•. V<**>

arrangement allows, by elastic deformation of. the boyle-shaped ones

■ - • '.■•*».. ■' " '"- i -to;*,."•; ■'•'** tg, i <** >

lugs 36 to compensate the mounting tolerances when mounting the boxes 33. Furthermore, it allows to guarantee^adequate mechanical hold in case of breakage of: one of the bolts. 32, which constitutes an additional security. The second sealing wall is attached to the second insulating wall by means of metal wings 42, and this attachment method has significant advantages:

.no empty space between the superimposed horizontal surfaces of two boxes 33, and secondly, the sliding joint 41-42 can be subjected to considerable forces "through the metal wing 42, thanks to

re the presence of the brace 43 which limits the sliding joint

its maximum opening to one millimeter. The attachment of cas-

tendon 51, which forms the first insulating wall, to the second wall is lined with the help of the metal wing 42, the boyle 47, the spring 48, the bolt 49 and the locking washer 50. As in the first, above-described variant, the insertion of the spring 48 allows a certain movement between the elements in the first and second walls..

It must be understood that the above described designs, on none

way is limiting, and can give rise to all kinds of desired modifications without therefore going outside the scope of the invention.

Claims (12)

1. Fastening of sealing walls and insulation layer at a thermally insulated, non-self-supporting liquid tank for liquefied gas for ships, which tank consists of a first sealing wall which forms the inner wall of the tank as well as a first thermal insulation layer connected to the sealing wall, and a second sealing wall and a second thermal insulation layer, and where the second insulation layer is attached to the s-shaped ts" walls that form the cargo space, and where the insulation layers are composed of insulation blocks to which sealing walls. formed or consisting of thin tin plates lie, whereby between parallel, adjacent, bent towards the interior of the tank edges of the j plates in the sealing walls is welded in a fastening strip that protrudes into the insulation layer which: lies behind the sealing wall and which is<*> attached to the insulation blocks by means of a sliding connection which can be moved along the edges, characterized in that it-first i;sb las jones-layer (170) is fixed to the second 'téthingsv?egg' (.liOO^. by,-help .of f jingling elements, ( 25 , 26, 28', •29^.:'.')3Qi:"*'4®) -iSG^fåbK^V' •ker perpendicular to isolas jonssj iktetajp^ånfi^ -(1'13") which is arranged with mutual distance, -and.* <:'s^;^r;:-f é&tet to'*,-;,1' the fastening strip. (8, 42) e 11^.^^^'^^-ip.^^e^n^^.t^^^■ ^ while welded, bowed edges (11) of the plat.éne (10) of-the ari "dre ; the sealing wall (100). 2. Fastening according to claim 1,<;> c a r a c t e "r i s e r t. in that f the bracing elements (25, 26,':-. -28'- :.& 9' <, - 30 , '48^ ^ f Br' .connection with the first isol-as^(i|tt^^i ^é^)'Æ70,)!?,'i.' ez\, fié( st! ét• /"to bolter~ (15) arranged on the opposite' side" of the holder (13) so that it roughly reaches to the first sealing wall.;<:>( 220), as the bolts are equipped with threads as well as nuts; (15a) and washer (16). 3. Fastening according to claim 2, characterized in that the suspension element consists of an elastic metal ring (25, 26). 4. Fastening according to claim 3, characterized in that the metal ring (26) is arranged flush with the fastening strip (8, 42) or in a plane that is perpendicular to this. 5. Fastening according to claim 2, characterized in that the suspension element consists of two parallel metal rails (28, 29) welded together at the ends (30), the one rail (28) on the middle part being connected to the ho.l'- the end part (13) and the other (29) on the middle part are connected with the bolt (15), and that the contact surfaces of the two metal rails (28, 29) run parallel to the plane of the first (220) and the second (100) sealing wall .: 6. Fastening according to claim 2, characterized in that the suspension element consists of a U-shaped spring (48) whose one leg is connected to the holder part (13), and whose other leg carries the bolt (15). 7. Attachment according to claim 6, characterized in that the U-shaped spring (48) for its attachment to the holder part (13) has a plate-shaped shoulder (48a) which is attached to the holder part (13) by means of bolts (48b), the bolts (48b) are secured by means of a cotter pin (48c). 8. Fastening according to claim 6, characterized in that the U-shaped spring (48) is attached by means of rivets to the holder part (13) which is connected to the second sealing wall (100). 9. Fastening according to one of the claims 1-8, characterized in that the backing disc (16) rests against a recess arranged in the corners of the right-angled insulation blocks (17) for the first insulation layer (170), and that each backing disc (16) simultaneously attacks four corners of adjacent insulation blocks (17). 10. Fastening according to one of claims 1-9, characterized in that the holder part (13) grips the fastening strip (8, 42) in a fork-like manner and that with this welded, bent edges (11) and is connected to these by means of welding or riveting. 11. Fastening according to one of claims 1-10, characterized in that the fastening strip (8) on its edge facing the ship's wall (1) carries two battens (9) as two additional battens (6) which are attached to the other insulation -layer (300) insulation blocks (3) engage behind, between which the fixing strip (8) projects through. 12. Fastening according to claim 11, characterized in that the laths (6) which hold back the fastening strip (8) consist of pieces of wood of equal length which overlap each other in pairs. in