FI79269C - Vessel without cross beam - Google Patents

Description

1 79269

The present invention relates to a vessel in which at least its side parts and the bottom part consist of a double hull structure. comprising an inner body plate and an outer body 1 tongue connected to each other by transverse flanges and a plurality of connecting fastening longitudinal members Ikei11a attached to said transverse bulkheads, the inner body plate and the outer body plate being connected to each other only by a fixed flange. Such a structure is intended for tankers and similar cargo ships.

When the tanker is at sea, various forces are applied to the hull of the ship. For example, the ship's hull itself is subjected to longitudinal bending moment and torques, the outer bottom plate and the outer side plate are subjected to water pressure, the inner bottom plate and the side wall of the cargo hold (oil tank) under the gravity of the oil cargo. To withstand these forces, the hull contains a large number of structural members, such as longitudinal beams (side longitudinal beams, bottom longitudinal beams, central power beam, etc.) extending in the longitudinal direction of the ship, and transverse beams (transverse beams, etc.) which are set. However, in the case of such a structure, the longitudinal beams and the transverse beams are arranged in intersecting order so as to have difficulties when the hull is constructed by automatic working methods (e.g. automatic welding). Therefore, in order to ensure automatic working methods, a double frame structure has been proposed, which does not include transverse beams other than transverse bulkheads and which consists of an inner frame plate and an outer frame plate attached to each other only by fixing longitudinal beams which are in turn fixed to the sides. In this case, however, the forces acting on the inner and outer hull plating are transmitted to the transverse bulkheads through the mounting longitudinal beams so that the proposed structure has strength problems when the transverse bulkheads are conventional in construction.

The object of the present invention is to provide a transverse beam-free vessel which can be implemented without problems of durability.

In order to fulfill the above object, the present invention provides a transverse beam-free vessel characterized by the features defined in the claims, each bulkhead having a central portion and an annular widening housing in the edge direction completely surrounding said central portion.

In the case of the transverse beam-free vessel described, each transverse bulkhead has the double hull structure described above so that even if the force acting on the inner or outer hull plating is transmitted to the transverse bulkhead through the anchorage or spa 1 month

In addition, since said double hull structure has an inner hull plate and an outer hull plate fixed to each other substantially only by means of fastening long beams, a transverse beam-free vessel has the following advantages.

(1) The absence of transverse beams reduces the number of parts, while the cuts between the mounting longitudinal beams and the transverse beams

II

The absence of 3 79269 allows the hull to be built by automatic working methods (e.g. automatic welding) with significantly improved efficiency, and in addition facilitates a complete inspection of the space defined by the inner and outer hull plates.

(2) Since there are no cuts with the transverse beams in the longitudinal mounting spindle, the tearing that would otherwise result from the ingress of tension in such cuts can be avoided.

(3) Spaces defined by the inner and outer hull plating and only divided by the mounting longitudinal beams may be used as ballast tanks. In addition, the ballast tank, which is not divided by transverse beams in the longitudinal direction of the ship, pushes completely easily.

(4) Even if a flammable liquid or gas enters the space between the inner and outer run-plating as a result of damage to the inner plating, the liquid or gas can be easily removed from this space to eliminate the risk of explosion because there are no transverse beams dividing the space longitudinally.

(5) The absence of transverse beams facilitates the hull stress analysis and ensures a reasonable arrangement of parts to reduce the weight.

(6) The double hull structure prevents the oil from escaping in the event of a collision with another ship or shore.

(7) As the hull does not have any internal projections, such as reinforcements, the inside wall of the hold can be coated, washed or scraped efficiently and properly and the surface area to be coated is smaller.

4 79269 Various features and advantages of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings, in which,

Fig. 10 is a diagram in cross-section showing a cross-beam-free ship according to a first embodiment of the invention.

Figure 11 is a diagram of a section taken along line XI-XI in Figure 10.

Fig. 12 is a diagram of a section taken along the line X11-X11 in Fig. 10.

Fig. 13 is a diagram in cross-section showing a transverse beam-free ship according to another embodiment of the invention.

Fig. 14 is a diagram of a section taken along line X1V-XIV in Fig. 13.

Fig. 16 is a diagram of a section taken along the line X V to X V in Fig. 14.

Fig. 16 is a diagram in longitudinal section showing a transverse beam-free ship according to a third embodiment of the invention.

Fig. 17 is a diagram in cross-section showing a ship without a cross-beam according to a fourth embodiment of the invention.

Fig. 18 is a diagram of a section taken along line XV 111-XV 111 in Fig. 17.

Fig. 19 is a diagram of a section taken along the line XIX-XIX in Fig. 17.

Figure 20 is a perspective view showing the same ship.

Referring to Figures 10-20, a rectangular beamless vessel consists of a deck portion, a bottom portion and opposite side portions, all of which have a double hull structure. The structure consists of an inner frame plate 1 and an outer frame plate 2 2, which are fastened to each other by means of fastening longitudinal beams 3. In addition, the inner and outer hull plates 2, 3 are fastened to each other by means of transverse bulkheads 4 (only one shown) spaced apart in the longitudinal direction of the ship. The weight reduction holes 7 and 8 are formed in the fastening length 11 and the fastening member 6, respectively.

Figures 10-12 show a first embodiment in which each transverse bulkhead 4 consists of two vertical plates 5 fixed together, running in the height of the ship and placed in the middle of the bulkhead 4, and a widening housing 11, which is in the shape of a rectangular ring and surrounds these vertical plates 5. This embodiment is advantageous in that the transverse bulkhead 4 is reinforced by the widening housing over its entire curved part.

According to the described embodiment, the cover part, the side part and the opposite side parts all have a double frame structure, but the cover part does not always have to have a double frame structure. When the widening housing 11 is used, the interior of the housing 11 can be used as a passageway for workers or pumps can be installed there, etc.

According to the second embodiment shown in Figures 13-15, only the bottom part and the opposite side parts of the ship have a double hull structure. Each transverse bulkhead 4 consists of a vertical corrugated plate 12 in the middle and expansion boxes 11 in the shape of a rectangular ring and surrounding the corrugated plate 12. The figures further show reinforcing deck longitudinal beams 13 attached to the inner and defines, and an oil or similar liquid 15 loaded into the hold 14 with the upper space left empty.

During sailing, the ship vibrates or swings, swinging the liquid 15 in the hold 14 and causing the liquid to strike the upper parts of the expansion box 11 of the bulkhead 4, as shown in Figure 15. In such a situation, the liquid 15, when not restrained from the movement, moves along the inclined surface of this part of the widening housing 11. As a result, no great force is applied to the upper corner of the hold 14 and it can be prevented from tearing due to the concentration of tension. The implementations of Figures 10-12 have the same advantage.

Fig. 16 shows another embodiment having the same structure as shown in Figs. 13 to 15, except that the deck portion of the ship, like other parts thereof, has a double hull structure including inner and outer hull plating 1 and 2.

Figures 17-20 show an embodiment in which the transverse bulkhead 4 consists of a generally rectangular, central corrugated plate 12 'having four rounded corners 12a' and an expansion housing 11 'having a generally rectangular ring shape and having four rounded corners 11a'. which in turn are uniform in shape with the corners 12a '. The four rounded corners 11a 'of the widening housing 11' further increase the strength of the transverse bulkhead, because the forces transmitted by the bulkhead 4 can be prevented from concentrating on the four corners of the bulkhead 4.

Il

Claims (2)

A vessel, in which at least its side parts and the bottom part consist of a double hull structure comprising an inner hull plate (1) and an outer hull plate (2) connected to each other by transverse bulkheads (4) and a plurality of connecting longitudinal beams (3) fixed said transverse bulkheads, the inner hull plate (1) and the outer hull plate (2) being connected to each other only by bulkheads (4) and fastening longitudinal beams (3), characterized in that each bulkhead (4) has a central part (5, 12) and an annular expansion housing (11) in the direction of the edge completely surrounding said central part (3, 12). Vessel according to claim 1, characterized in that said central part comprises a corrugated plate (12) which is generally rectangular and has four curved corners (12a1), and the annular widening housing (11) is in the form of a generally rectangular ring and has four a curved angle (11a ') according to the shape of the curved corners (12a') of said corrugated plate (12). 20 • m,