JPH05294278A - Double bottom structure for vessel, etc. - Google Patents

Abstract

PURPOSE:To provide a double bottom structure which possesses the excellent ventilation performance and facilitates the precision control in construction. CONSTITUTION:Flat steels 15 and 16 each having the width shorter than each height of the longe members 12 and 13 are used without using a floor partitioning the inside of a double bottom, and the part between the contiguous longe members 13 and 14 and the part between the longe members 13 and 14 and a girder 12 are connected by the flat steels 15 and 16, and the flat steels 15 and 16 installed on both the plates 10 and 11 are further connected along the girder 12 by a flat steel 17. Accordingly, the ventilation performance in the double bottom is improved, and the working environment in construction and after navigation can be improved, and since it is enough to set only a ship bottom outer plate 10 as standard plane, the precision control in construction is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double bottom structure such as ships and offshore structures.

[0002]

2. Description of the Related Art Generally, when constructing a hull, a hull block is constructed by dividing an outer plate, a deck, a bulkhead, etc. of the hull in advance, and the hull blocks are assembled to construct the hull.

By the way, some hulls have a double bottom structure as shown in FIG. FIG. 3 is a cross-sectional view of a conventional double bottom center cross section.

In FIG. 1, reference numeral 1 is a ship bottom outer plate which comes into direct contact with seawater, and 2 is an inner bottom plate provided in parallel on the ship bottom outer plate 1.
3 is a girder that connects the bottom outer plate 1 and the inner bottom plate 2 and is provided in the longitudinal direction of the hull. 4 is a connection between the bottom outer plate 1 and the inner bottom plate 2 that is provided in the width direction of the hull. The floor 5 is an inner bottom longe which is erected on the inner bottom plate 2 in parallel with the girder 3,
Is a bottom longe that is erected on the bottom outer plate 1 in parallel with the girder 3, and 7 is a slot formed in the floor 4 for penetrating the respective longes 5 and 6.

[0005]

The conventional double bottom structure shown in FIG. 3 has the following problems.

(1) The inside of the double bottom is the floor 4 and the girder 3.
The work environment is poor at the time of construction because it is divided into grids by and. Moreover, the air permeability is poor even after in service, and when a person enters the inside of the double bottom for inspection or the like, there is a risk of oxygen deficiency or the like, which is dangerous.

(2) Since the girder 3 and the floor 4 have a vertically integrated structure, it is difficult to control the accuracy during construction (a single bottom has one reference surface, but a double bottom has an inner bottom plate). The bottom shell and each must be horizontal).

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems and provide a double bottom structure for a ship, which has good air permeability and facilitates accuracy control during construction.

[0009]

In order to achieve the above object, the present invention is directed to a ship bottom outer plate, an inner bottom plate parallel to the ship bottom outer plate, and both of which are provided so as to stand facing each other. In a double-bottom structure for ships and the like, which comprises a longe member provided in parallel and a girder provided in the longitudinal direction of the longe member and connecting both plates, a flat steel having a width shorter than the height of the longe member is used. In addition to connecting between the adjacent longe members, between the longe member and the girder, the flat steels provided on both plates are further connected along the girder with the flat steels.

[0010]

According to the above construction, since the flat bar having a width shorter than the height of the longe member is used to connect the adjacent longe members and between the longe member and the girder, the inside of the double bottom is divided into blocks as in the conventional case. Since the floor that was previously used is not used, it is possible to ventilate the inside of the double bottom, which improves the working environment during and after the construction. Since the inner bottom plate and the inner bottom plate are connected to each other, only the outer plate of the bottom of the ship is used as the reference surface at the time of construction, so that accuracy control becomes easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory view for explaining a double bottom structure of a ship or the like according to the present invention.

In the figure, 10 is a ship bottom outer plate that directly contacts seawater, 11 is an inner bottom plate parallel to the ship bottom outer plate 10, and 12 is a space between the ship bottom outer plate 10 and the inner bottom plate 11 in the longitudinal direction of the hull. Girders that are provided in parallel to the
Is an inner bottom longe that is erected on the inner bottom plate 11 parallel to the girder 12, 14 is a bottom longe that is parallel to the girder 12 and perpendicular to the bottom outer plate 10, 15 to 17 are flat steel, and 18 is a bracket, respectively. Show.

The flat steels 15 to 17 are made of a material having a shear strength about twice that of both the longes 13 and 14.

The ship bottom outer plate 10 and the inner bottom plate 11 are formed by appropriately welding a plurality of plate-shaped members, and on each of these plate-shaped members, an inner-bottom longe 13 and a ship-bottom longe 14 having a substantially inverted L-shaped cross section. Are provided so as to stand along the longitudinal direction of the hull and in parallel at predetermined intervals.

These inner bottom longe 13 comrades and ship bottom longe 14 comrades are inner bottom longe 13 and ship bottom longe 14
Are connected by flat steels 15 and 16 having a width shorter than the height of.

The girders 12 are provided upright at appropriate intervals so as to be parallel to the bottom of the bottom plate 14 of the bottom plate 10 when the bottom plate 10 is assembled. The inner bottom plate 11 is provided at the upper end of the girder 12. After arranging the plate-shaped member to which the inner bottom longe 13 is attached and turning upside down and arranging the upper and lower respective longes 13 and 14 to face each other, the plate is welded to the inner bottom plate 11. In addition, both longies 1 that connect to the girder 12 up and down
3, 14 are connected by flat steels 15, 16. Further, the upper and lower ship bottom outer plates 10 and the inner bottom plate 11 are sequentially assembled as described above.

Further, the flat steels 15, 16 connecting the girder 12 and both the longes 15, 16 are welded to the girder 12 and connected to each other by the flat steel 17, and the flat steel 17
And the corners of the upper and lower flat bars 15, 16 and the upper and lower flat bars 15,
Brackets 18 are welded to the corners formed by 16 and the girder 12, respectively.

As described above, the ship bottom outer plate 10, the inner bottom plate 11,
A double bottom block composed of the girder 12 and the flat steels 15 to 17 is sequentially assembled and connected in the required number in the ship length direction and the ship width direction to form a double bottom block.

FIG. 2 shows an example in which the double bottom and the ship side 20 are joined.

The double bottom joint 21 on the ship side 20 is the bottom shell plate 1
0 and the inner bottom plate 11 are connected by the floor 4 integrated with the ship side 20, the slot 7 is formed in the floor 4 as described in the conventional example, and both the longes 5, 6 are inserted so as to pass through the slot 7. The upper and lower plates 10 and 11 are attached in advance, and the joint portion 21 and the double bottom of the present invention are connected and assembled. Also, the upper and lower longes 5 and 6 are appropriately flat steel 1.
Connected at 7.

The joint portion 21 may have a double bottom according to the present invention.

As described above, according to the present invention, when assembling the double bottom, the flat steels 15 to 17 having a width smaller than the height of the longe member are used without using the floor which is divided into blocks as in the conventional case. 1 adjacent to each other
Since 3 and 14 are connected, and between the longe members 13 and 14 and the girder 12, the air permeability in the double bottom is improved, the working environment during and after construction is improved, and the upper and lower flat steel bars are connected. Since 15 and 16 are connected to the bottom outer plate 10 and the inner bottom plate 11 along the girder 12 with the same flat steel 17, it is only necessary to use only the bottom plate 10 as the reference surface, which facilitates accuracy control during construction. Become.

Further, flat steels 15 to 1 used for double bottom construction
Since 7 is smaller than the floor 4, etc., it is easy to store and move, and the installation work efficiency is improved.

The load applied to the double bottom by the load on the double bottom first acts on the flat steel 16 from the inner bottom longe 13, and the flat steel 16 applies the load to the flat steel 17 and the girder 12. It is transmitted and finally TBHD (not shown) from the girder 12
(Transverse Bulkhead)
Be transmitted to.

As described above, according to this embodiment, the following effects can be obtained.

(1) Flat steels 15 and 16 having a width shorter than the height of the longe members 12 and 13 are used, and the flat steels 15 and 16 are arranged between adjacent longe members 13 and 14, and between the longe members 13 and 1.
4, while connecting the girder 12 between, both plates 10, 1
Since the flat steels 15 and 16 provided in 1 are further connected by the flat steel 17 along the girder 12, the air permeability in the double bottom is improved, and the working environment during and after the construction is improved. In addition, since it is sufficient to use only the ship bottom skin 10 as the reference surface, accuracy control during construction becomes easy.

(2) Flat steel 15 to 17 instead of the floor 4
By using, the weight of the entire ship can be reduced without changing the size of the longes 13, 14.

(3) Since the number of members for connecting the outer bottom plate 10 and the inner bottom plate 11 to each other can be greatly reduced,
It is possible to divide the double bottom, which was an integral block, into upper and lower parts, which greatly improves the working environment (especially for painting work), and reduces the coating area inside the double bottom, thus reducing the cost.

(4) Since the conventionally existing slot is eliminated, the structure is suitable for automation (especially automatic welding).

[0031]

In summary, according to the present invention, the flat bar having a width shorter than the height of the longe member is used to connect the adjacent longe members with the flat bar, and between the longe member and the girder, and to connect both plates. Since the flat steels of the ship are further connected by the flat steels along the girder, it is possible to provide a double bottom structure of a ship with good air permeability and easy quality control during construction.

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining a double bottom structure of the present invention.

FIG. 2 is a partial transverse cross-sectional view of a hull using the double bottom structure shown in FIG.

FIG. 3 is an external perspective view of a conventional double bottom structure.

[Explanation of symbols]

 10 Ship bottom outer plate 11 Inner bottom plate 12 Girder 13 Inner bottom longe 14 Ship bottom longe 15 to 17 Flat steel 18 Bracket

Claims (1)

[Claims] 1. A ship bottom outer plate, an inner bottom plate parallel to the ship bottom outer plate, a longitudinal member provided to be opposed to both plates and provided in parallel, and a longitudinal direction of the longitudinal member. In a double bottom structure of a ship or the like which is provided with a girder that connects the both plates to each other, flat steel having a width shorter than the height of the longe member is used, and between the adjacent longe members, the longe member and the girder. While connecting between and
A double-bottomed structure for ships and the like, characterized in that flat steel sheets provided on both plates are further connected along the girder with flat steel sheets.