JPS60219193A - Construction of ship body reinforced against ice - Google Patents

Abstract

PURPOSE:To simply realize the construction of ship body reinforced against ice by outwardly projecting a series of bulge triangular in cross section, on the shell plate of a ship body, which is formed with inclined bottom plates and inclined top plates with elevation angles and depression angles of 30-60 deg. relative to the horizontal surface, respectively, and also vertical reinforcements. CONSTITUTION:A series of bulge 5 in the form of triangles in cross section is formed with inclined bottom plates with elevation angles of 30-60 deg. relative to the horizontal surface, inclined top plates with depression angles of 30-60 deg. relative to the same, and approximately vertical reinforcements. The ridge line 7 of the bulge 5 projects along the shell of the ship body so as to meet with the level subjected to ice load, thereby to obtain a construction reinforced against ice with a simple job in such a way of projecting a series of bulge on the shell of the ship body without any internal reinforced construction of the ship body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-resistant reinforcement structure for a ship's hull.For example, in a single point mooring purge system, in order to reduce costs, as shown in the side view of FIG. Oil tankers such as Since the side skins are nearly vertical, ice loads can be very large for this type of ship.

Conventionally, measures have been taken to reinforce the internal structure of the ship's hull in order to resist large ice loads, but such measures not only increase construction costs but also require a long construction period.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a water-resistant reinforcing wedge structure for a ship hull that reduces reinforcement work costs and shortens the construction period.

To this end, the present invention has an inclined bottom plate having an elevation angle of 30 to 60 degrees with respect to the horizontal plane, an inclined top plate having a depression angle of 30 to 60 degrees with respect to the horizontal plane, and a vertical reinforcing member, which has a triangular cross section. The bulge is characterized in that the ridgeline of the bulge projects along the outside of the hull shell at a level at which it receives an ice load.

An embodiment in which the present invention is applied to a single-point moored oil storage barge using a used oil tanker will be described with reference to the drawings. Fig. 2 is a side view thereof, Fig. 3 is an enlarged sectional view showing the water-resistant reinforced structure of Fig. 2, FIG. 4 is a side view showing an embodiment in which the present invention is applied to an oil tanker, and FIG. 5 is a partially enlarged cross-sectional view of FIG. 4.

In the above diagram, 1 is a mooring buoy that serves to moor barge 4, which is a used oil tanker, and also sends crude oil sent from the base to barge 4. 2 is a mooring buoy that holds mooring buoy 1 at a fixed point on the seabed. 3 is a mooring device for mooring the barge 4 to the mooring buoy 1; 5 is a removable water load reducing bulge with a buoyancy structure partially added along the outside of the bow and stern side shells of the barge 4; , 6 is the outer plate 18 of the barge 4
transverse ribs, 9 and 10, provided vertically inside the
are a 30° depression angle imaginary line and a 60° depression angle line drawn with respect to the horizontal baseline 8 passing through the level of the ridgeline 7 of the water load reduction bulge 5, respectively.
The angle of depression imaginary lines 11 and 12 are drawn with respect to the horizontal baseline 8 passing through the level of the ridge 7 of the water load reduction bulge 5, respectively.
0° elevation angle imaginary line and 60° elevation angle imaginary line, 13 is a bulge top plate inclined within the range between 30° elevation angle imaginary line 9 and 60° elevation angle imaginary line 10, 14 is 30° elevation angle imaginary line 1
15 is a bulge top plate 13 and a bulge bottom plate 1 which is inclined within a range between 1 and 60° elevation angle virtual lines;
Small aggregate to reinforce 4.

16 is a large aggregate that reinforces the small aggregate 15, and 17 is a sea surface.

In such a structure, the bulge top plate 13 is inclined upwardly from the ridgeline 7 within a predetermined range of angles, and the bulge bottom plate 14 is inclined downwardly from the ridgeline 7 within a predetermined range of angles.
It can absorb ice loads such as sea ice pressure and impact, and change the ice failure mode from compression failure mode to bending failure mode.

Moreover, since the total ice load on the barge 4 is also reduced, the load on the mooring line 2 is also reduced. According to such a structure, the following effects can be achieved.

(1) Waterproof reinforcement work is mainly carried out on the outside of the ship, so construction costs are not high.

(2) Since the water load reducing bulge 5 can be prepared in advance, the construction period is shortened.

(3) Compared to the compressive fracture strength of ice, the bending fracture strength of ice is 11
Since it is as low as 5 to 1/10, the ice load can be significantly reduced, and this is especially advantageous for barges with vertical ship sides. - Next, in the structure shown in Figures 4 and 5, the oil tanker 4' is constructed with a buoyancy structure and the water load reducing bulge 5' of the structure is attached.
, which protrudes over the entire circumference, and can achieve substantially the same effects as the above embodiment.

Although the embodiments in which the present invention is applied to barges and oil tankers in single-point moored purge systems have been described above, the present invention can also be applied to various types of ships.

In short, according to the present invention, an inclined bottom plate having an elevation angle of 30 to 60 degrees with respect to the horizontal plane, an inclined top plate having a depression angle of 30 to 60 degrees with respect to the horizontal plane, and a vertical reinforcing member are formed into a Y triangle. By protruding the bulge having a cross-section along the outside of the hull shell at a level where the ridgeline receives the ice load, an economical and effective water-resistant reinforcing structure for the hull can be obtained. The present invention is extremely useful industrially.

[Brief explanation of drawings]

Fig. 1 is a side view showing a single-point moored oil storage barge system using a used oil tanker; Fig. 2 is a side view showing an embodiment in which the present invention is applied to a single-point moored oil storage barge using a used oil tanker; The figure is an enlarged sectional view showing the water-resistant reinforced structure shown in Fig. 2, Fig. 4 is a side view showing an embodiment in which the present invention is applied to an oil tanker, and Fig. 5 is a partially enlarged cross-sectional view of Fig. 4. . 1. Mooring buoy, 2. Mooring line, 3. Mooring device,
4...barge, 4'...oil tanker, 5.5'...
Water load reduction bulge, 6... Lateral rib, 7... Ridge line, 8...
Horizontal baseline, 9...30° virtual depression line, 10...60° virtual depression line, 11...30° virtual elevation line, 12...60°
Elevation angle virtual line, 13...Bulge top plate, 14...Bulge bottom plate. 15...Small aggregate, 16...Large aggregate, 17...Sea surface. 18... Outer board. Sub-Agent Patent Attorney Masafumi Tsukamoto

Claims (1)

[Claims] A bulge with a triangular cross-section formed by an inclined bottom plate having an elevation angle of 30 to 60° with respect to the horizontal plane, an inclined top plate with a depression angle of 30 to 60° with respect to the horizontal plane, and a vertical reinforcing member is formed along its ridgeline. A water-resistant reinforcing structure for a ship hull, characterized in that the water-resistant reinforcing structure protrudes along the outside of the hull shell in accordance with the level of ice load received.