DE1506252A1 - Leak-proof, heat-proof built-in basin in a rigid supporting structure - Google Patents

Description

The invention relates to a flüsägke its dense, heat density Built-in tub in a rigid, load-bearing construction, especially of a ship, between the transverse walls and consists from two consecutive seal barriers, one primary first and a secondary second, alternating with a primary first and a secondary second thermal barrier.

The invention is primarily of benefit to the
Ship transport and the j _J a ^{a (} il ^a 6 ^{er xxn} E of liquid gases, especially liquid natural gases with a high methane content.

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Ea is known that to increase the capacity to Ships specific to this transport and a reduction in the production costs of the cooling tanks are sought, so-called built-in tanks to accommodate in the hull by, as it were, the walls of the ships with the help of liquid and Thermal barriers fail, usually with two each, without their own Stiffness, so that the hydrostatic loads exclusively be taken up by furnace-bearing structures of the ship.

The main difficulty in execution and use of this Built-in tubs result from severe shrinkage that occurs if their walls are in the range from the ambient temperature to the boiling point of the liquefied gas (- 160 ° in the case of methane) run through. In order to avoid this shrinkage, right-angled corrugations are generally made in both directions Consume metal. The metals used are generally stainless steels or aluminum alloys are not brittle at low temperatures. In view of the complicated design, it is extremely difficult to <4ie to support thin walls in all temperature ranges. Therefore it is the basic idea of the invention to be one on all points to use a thin, smooth skin made of Invar steel supported by an insulating layer that is as rigid as possible.

However, you can even use special steel bars of large dimensions of the built-in tubs neither the shrinkage nor that caused by the wave impact on the load-bearing structure of the ship and beyond completely avoid these longitudinal bends transferred to the tub. In the known constructions, the forces come into play on level KnoteW-eche (hereinafter 2-surface called), since the tub for installation reasons is generally

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is angular, and even more on spatial gusset plates (in the following 3-surface called) where changing shrinkage even the Can destroy locks.

The invention solves the problem of avoiding the technical disadvantages in that the 2 and 3 surfaces on the transverse walls the ships are constructed in such a way that no deformation can occur, not even under the influence of the inevitable Shrinkage.

The invention consists in that the first and second sealing barrier each at the joints of the walls of the ship the periphery run out in a dimensionally stable polygonal ring, which is formed from strips of the same sheet, but which is thicker than that of the seal barriers. One of those stripes is located according to the invention in the extension of the transverse wall and is at its two edges by screws on wooden planks attached. The other strip that completes the 2-sided, is welded with one of its edges perpendicular to the first between two fastenings and sits with its other Edge on the plank .. The entirety of the planks, which may consist of several sections with free stress is permanently attached to the angle of the ship's structure with the help of bearing blocks. The bearing blocks are at intervals attached directly to the 2-surface of the second lock and spacer rods of the bearing blocks run through the sealed second barrier through, in order to rest on it in the case of the 2-flats. There are 5 faces at each corner of the dimensionally stable ring Made of special steel, one of which is connected to the second barrier diiöct with the ship's wall by three spacers is, which preferably consist of stainless steel tubular elements. The other is through to the first lock as well three spacers in the form of metal tubes or bars attached to it.

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The strips of the ring are welded to the two seal locks. The corresponding wooden planks are at the bottom of the Walls of one or the other 3-sided fixed by screws. The screws sit over the joint welds and are tightened in front of the cover. The entirety of the solid ring and the 2 and 3 surfaces are at ambient temperature, without tension, assembled so that they are under elastic tension during operation.

An exemplary embodiment is shown in the drawing. There are:

Figure 1 is a horizontal partial section with two surfaces,

Figure 2 is a vertical section of a transverse partition with three surfaces,

FIG. 3 is a horizontal section along line III - III of FIG. 2,

The description is based on a hull with ship ribs and intermediate structural parts and a double inner wall, which is smooth. For reasons of lateral stability and a lighter construction, the double wall follows the more or less bulged one Shape of the hull with a polygonal, often octagonal contour, i.e. essentially a rectangle with four cut corners. From front to back there are a number of intended for the transport of liquefied petroleum gas Bunkers delimited and separated from each other by double partition walls, between which the necessary carpentry is located. • Inside this bunker is a built-in tray with two consecutive ones Sealing barrier} arranged alternately with two thermal barriers.

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Figure 1 shows from the inside out: the first liquid barrier made of thin metal strips 37, slightly stretched, bulging 40 at the edges, the first thermal barrier in the form of insulating boxes 14, the second sealing layer, also made of strips 8, joined together at the edges 9, the second sealing layer from insulating boxes 1, the double wall 3 and finally, not shown, the ship's hull.

The walls of the ship that abut the bulkheads 4, are built the same throughout, and they are also each surrounded according to the invention with a dimensionally stable ring. 2-surface of the two second sealing layers 8 is as follows formed: One uses two Holubooms 43 and (Fig. 1), which are spaced by bearing blocks 45, 46 made of flat iron are supported, which are welded perpendicular to a strong piece of sheet metal 47 parallel to the imaging plane and at the same time are welded to 45, 46 and to the walls 3 »4. The wooden planks 43, 44 are attached to 45 and 46, screwed mti; screws, not shown, which leave a slight play in the longitudinal direction of the planks.

The wooden plank 43 in the extension of the wall 8, parallel to wall 4, is first attached and then covered with a metal strip 48 with a high nickel content, which is preferably identical to the other strips but thicker, about 1.5 mm. This strip has a flange 49, in the right The angle is folded and fastened to the board 43 with screws 50, while the other flange is fastened with screws 51. Finally, the wooden plank 44 is fastened in place and a second strip 52 analogous to 48 but with two right-angled ones Flanges that have a 53 for bolts 54, like that

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Edge 49 and the other 55 along the strip 48 on which it is welded _t where an unillustrated here asbestos strip is inserted between strip 48 and screed.

The strip 48 is then attached to the end of the second barrier 8, which he bit on both edges with joint cover, extended. In the same way, the strip 52 is connected to the second barrier that it is connected to another Joint cover 57 extended.

On each of the elements 45, 46 and 47 Bearing blocks are welded to two rods 58, which are sealed the joint covers 56 and 57 with the aid of not shown Cross connection washers, and a second bracket made of two rectangular sheets 59) 60, which are at right angles are bitten, serve as a support. This second bracket supports two planks 61, 62 for the first lock play the same role as the wooden planks 43, 44 for the second lock. Metal strips 63, 64, such as strips 48 and 52 are connected to one another in the same way and attached to the two wooden planks 61 and 62. Finally connect Joint covers 65, 66 these strips 63, 64 on the first barrier in the same way as the preceding joint covers 56 and 57

The flanges must of strips 48, 52 or 63, 64 are constructed so that they form the successive angles of the polygonal ring, which, as indicated above, is generally octagonal is. Each of these angles forms a 3-surface at the intersection of three planes, two of which are parallel and one perpendicular run to the SchiffsacfcEB.

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These connections are made with the help of three-surface pieces of metal, made of special sheet steel, for example steel with 9% nickel content, with a greater thickness than the aforementioned strips, for example 8 mm. The 3-flats 67, an arrangement of three welded metal sheets, is attached to the ship's walls with the help of the three spacers 68 of sufficient compressive, tensile, and other buckling strength and low thermal conductivity. For this reason, stainless steel pipe parts with a relatively large diameter and small wall thicknesses are preferably used.

The wooden planks 43, 44 are with screws 69 on the 3-er Surface 67 attached. The screws sit in corresponding openings, while the ends 70 of the strips 48, 52 are welded to this 2-flattener so that they have the screw heads 69 cover and ensure tightness all around. The joint covers 56,57 are also with the three walls so fucked up that the tightness of the second lock is given is as well as a conduction of all forces that are directly in the plane of the transverse wall of the tub and in the sense of the parallel surfaces run to the wall.

It goes without saying that the on-site at ambient temperature The welded overall complex experiences a shrinkage of the transverse wall of the tub when the temperature drops, which in Strip direction 48 a tensile stress arises. The 2-planes concentrate the forces and direct them to the 5-planes Further. Since, as explained above, the last ones are rigidly connected to the ship's structure, these tensions can do not cause any deformation, just elastic tension within the individual parts. Given the high mechanical resistance of the materials used and their low expansion coefficient, even at temperature

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door of the order of - 160 ° 0, which is common, goes . the mechanical stress due to thermal effects does not exceed 5 ^ g per square mm, which is from the elastic limit this nickel steal is far away.

This type of design is therefore free to play with the stress opposite, since the mechanical clamping of the entire ring consisting of surfaces is provided. The effects the wall tension on the running part of the length of the surfaces are absorbed by the rigidity of the planks 4-3 »44, and forwarded to the bearing blocks at intervals. As for the first ban, everything applies to them second lock was said, and the other 3-E'lächner is 71 Constructed like 67, but of a smaller size, and is supported by three rods 72 that sit on the 3-surface 67. The wooden planks 61 and 62 are fastened in the same way to the 3-sided, i.e. with screws 73, the heads of which through the Strip flanges 63, 64 are covered. These strips wow how the joint covers 65,66 are tightly connected to one another by welding 71 · Processing and clamping are natural the same.

Each of the sealing barriers of the tub, the first as the second has at each end to a non-deformable stretched on a rigid annular transverse wall. The ring is also not deformable and is supported by its eight angles and a certain number of intermediate bearings.

The entire wall is consequently not subject to any deformation, but only to changing elastic loads.

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In the same way, the side walls of the tub are subject to the their ends are connected to the dimensionally stable ring, no deformation due to a drop in temperature or deformation of the fuselage wall, but only elastic tensions.

Patent claims:

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Claims (1)

150625; PATnTTAIISPRUOH: Liquid-tight, heat-tight built-in tub in one rigid, load-bearing construction, especially of a ship, between the transverse walls, consisting of two successive ones Sealing barriers, a primary, first and a secondary, second, alternating with a primary, first and a secondary, second V / ärmesperre, characterized in that the The ship's bumpersf the first 37 and second seal locks 8 each expire at the periphery in a dimensionally stable polygonal ring made of strips of the same sheet is formed, which, however, is thicker than that of the sealing barriers that one of the strips is in the extension of the transverse wall is located and is fastened to wooden planks at its two edges by screws, while the other strip that completes the 2 face, with one of its edges perpendicular to the first, between two fastenings are welded to it other edge sits on the plank that the entirety of the planks, preferably in several sections, free of Stress, is permanently attached to the angle of the ship structure with the help of bearing blocks that the Bearing blocks are attached at intervals directly to the two-surface of the second lock and the spacer rods the bearing blocks reach through the second lock in a sealed manner in order to, in the case of the two-sided, towards it rest that on every Y / angle of the dimensionally stable ring triple made of special steel are attached, one of which, to the second barrier, is directly connected to the ship's wall by three spacers, the * the walls 009817/0528 BADORlQfNAL r 1Ε06252 U preferably consist of stainless steel tubular elements and to the first lock, also through three tax restrictions in shape before. ^ metal pipes or rods on it it is fastened that the strips of the ring are welded to the two sealing barriers that the corresponding There are wooden planks at the bottom of the V. or other tripod fastened by screws are that the screws over the I-'ufrenschweißunren Sit flatter, and have been tightened in front of the cover are and daf: the entirety of the solid ring and the Zweiflrichner and Dreifldehner at TImfr-el.unßstemparatur without Cpnnnunr, zuannnenpebaxit nir.d, co do? cie im p.etri eh under elastic tension rather ... 009817/0528 BATH Blank page