JPH07108976A - Buoyancy type sea chest grating - Google Patents

Abstract

PURPOSE:To reduce cost as well as simplify structure so as to be able to open/ close and restore a sea chest grating in the man-saving and labor-saving state although a great deal of labor and time are required when a diver opens/closes the sea chest grating underwater since the underwater weight of the sea chest grating used for a marine vessel, specially a large marine vessel, is fairly heavy. CONSTITUTION:A rectangular sea chest grating closably mounted to the rectangular seawater inlet of a bottom shell plate or the like is provided with hollow steel pipe members closed in the watertight state at both ends and additionally provided over the whole or greater part of the front and rear part aggregate 5F, 5A and left and right part aggregate 4L, 4R of a rectangular outer frame 11. Center part aggregate 5M at the center part of the rectangular outer frame 11 is also formed of hollow steel pipe members with both ends closed in the watertight state. In addition, the aggregate 5F, 5A and center part aggregate 5M are to be hollow steel pipe members with semi-circular cross section protrusively bent outward, and the cross section of these aggregate are formed into triangular shape with the front edge pointed in an acute angle and the outer face formed into the flat face along he bottom shell plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buoyancy-type seawater suction grid attached to the seawater suction port of a large ship.

[0002]

2. Description of the Related Art In large ships, in addition to the dry dock regular inspection, underwater inspection of the seawater inlet and the discharge portion may be performed regularly. At that time, the worker became a diver and
As shown in, the heavy water seawater suction grid 013 that dives below the bottom shell plate 011 and is attached to the seawater suction port 012.
Is opened and closed to perform the underwater work such as replacement of the protective zinc 015 attached to the inner surface of the seawater suction box 014 and attachment of the blind plate 017 for opening the seawater valve 016. Where 01
Reference numeral 8 is a seawater suction pipe.

[0003]

However, as shown in the bottom view of FIG. 5 and its longitudinal sectional view, the seawater suction grid is usually formed by welding a plurality of parallel grids made of flat steel to a rectangular outer frame made of flat steel. The front end is pivotally supported by one end of the seawater intake port of the outer plate by a hinge, and the rear end is fastened to the opposite end of the seawater intake port by a bolt nut. Therefore, it takes a lot of labor and time for the worker to open and restore the heavy seawater suction grid in water.

The present invention has been proposed in view of the above circumstances, and an object thereof is to provide a seawater intake grid for a ship, which has a simple structure and can be opened / closed and restored in a labor-saving and labor-saving manner. And

[0005]

To this end, the invention of claim 1 is a rectangular seawater suction grid that is openably and closably mounted on a rectangular seawater suction port such as a bottom shell plate. Part or all of the aggregate is formed, and each end is provided with a hollow steel pipe material which is watertightly closed.

According to a second aspect of the present invention, in the rectangular outer frame according to the first aspect of the present invention, in the rectangular seawater inhalation grid having a central aggregate in the central portion thereof, the central aggregate is watertightly closed at both ends. It is characterized by being formed of a hollow steel pipe material.

A third aspect of the present invention is characterized in that, in the first or second aspect, the front and rear aggregates and the central aggregate are hollow steel pipe members having a semicircular cross section that is convexly curved outward.

According to a fourth aspect of the present invention, in the first or second aspect, the front and rear aggregates and the central aggregate have a sharply pointed front end, and the outer surface is a flat surface along the bottom shell plate. It is characterized by being formed in a triangular cross section.

[0009]

According to this structure, the front and rear aggregates and the left and right aggregates of the rectangular outer frame are wholly or mostly made of hollow steel pipes. Water-tight welded structures are used at both ends to prevent external seawater from entering the hollow part of each aggregate. Then, since the underwater weight of the outer frame is reduced by the amount of buoyancy due to its volume, it is possible to perform the opening / closing, opening, and restoration work very labor-saving and labor-saving. Further, in the outer frame having the central aggregate, by forming the central aggregate also from the hollow steel pipe material, it is possible to reduce the weight of the entire underwater. Furthermore, by making the cross-section of each aggregate a semi-circular cross-section that bends outward, not only is the weight of the seawater intake grid lighter in water, but a seawater intake grid with less suction resistance is obtained. In addition, the cross-section of each aggregate is sharply pointed at the front end and the outer surface is a flat surface that matches the surface of the bottom plate of the ship, so that a seawater suction grid with less water resistance during running can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one embodiment of the present invention is shown in FIG. FIG. 2 is a partial vertical cross-sectional view showing a ship bottom skin provided with the seawater suction grid of FIG. FIG. 3 is a partial vertical sectional view showing a modification of FIG.

The present invention is greatly different from the conventional seawater suction grid shown in FIGS. 4 to 5 in that instead of flat steel, the seawater suction grid has a closed cross section such as a triangular steel pipe or a square steel pipe. It is due to the use of the hollow steel material.

That is, in FIGS. 1 and 2, 1 is a bottom plate, 2 is a parallel lattice plate, 3 is a 1/4 arc-shaped corner plate, and 4 _L and 4 _R each have a square cross section with both ends closed. Left aggregate made of hollow steel pipe (square tubular steel pipe), right aggregate 5 _F , 5 _M , 5 _A are front aggregates made of hollow steel pipe (triangular tubular steel pipe) each having a right-angled triangular cross section, Central aggregate, rear aggregate, 6 is a pair of hinge hardware consisting of clevis plate 6 _c , bolt nut 7 _F and inner plate 6 _I , 7 _A is a long hole, 8 is an L-shaped attachment on the bottom plate 1 side A seat, 9 is a lattice mounting bolt nut, 10 is a U-shaped metal object which is symmetrically recessed in the front end portion of the seawater intake lattice,
Reference numeral 11 is seawater, a seawater suction grid, 12 is a flat steel plate, 13 is a seawater suction port, and 020 in FIG. 2 is a pump inserted in the seawater suction pipe 018.

The seawater suction grid 11 according to the present invention is formed by joining the above-mentioned members as shown in FIG. 1 in the following manner. That is, a pair of left and right aggregates 4 _L and 4 _R , each of which is a relatively short rectangular tube,
Front aggregate 5 consisting of a pair of relatively long triangular tubular steel pipes
_The corners of the rectangle consisting of _F and the rear aggregate 5 _A are joined by the corner plates 3 each having a 1/4 arc-shaped radius, and the outer ends of the U-shaped metal products 10 projecting inward to the left and right of the front end, respectively. Joined, the U-shaped hardware 1
By connecting the opposite inner ends of 0 with a short front aggregate 5 _F (a short flat steel plate is also possible), a rectangular outer frame 15 having four rounded corners is formed. At that time, a pair of left and right left aggregate 4 _L, right aggregate 4 _R ends of the openings at both ends of the front aggregate 5 _F, posterior bone material 5 _A pair before and after closing the respective air-tight.

[0014] Next, welded left and right ends of the central bone 5 of the rectangular outer frame 15 to the left aggregate 4 _L respectively, hermetically in the right aggregate 4 _R opposite ends of the left and right directions a plurality of longitudinal flat steel plate 12 The parallel lattices 2 are formed by connecting to the inner ends of the front and rear sides of the rectangular outer frame 15 via the central aggregate 5 _M at equal intervals. Also, the outer frame 1
At the front end of 5, the inner plate 6 _I of the hinge metal 6 is projected at the center of the recess of the pair of left and right U-shaped hardware 10, 10, and the left and right sides of the rear end of the outer frame 15 are located near the left and right ends. The long holes 7 in the front-rear direction are provided symmetrically. At that time, the right and left end opening of the central portion aggregate 5 _M is closed hermetically, respectively.

Further, the clevis members 6 _C of the hinge hardware 6 are provided at symmetrical positions at the inner peripheral side front end of the seawater suction grid 13 for mounting the seawater suction grid of the ship bottom outer plate 1, and the seawater suction port 13 is provided. At the rear end, L-shaped mounting seats 8 are provided at symmetrical positions, respectively. Thus, the seawater suction grid 11 is pivotally attached to the seawater suction port 13 with the clevis member 6 _C and the inner plate member 6 _I of the hinge metal 6 by means of hinge pins made of bolts and nuts, respectively, and the long hole 7 at the rear end of the seawater suction grid 11 is connected.
_A is fixed by a bolt nut 9 at the L-shaped mounting seat 8 of the seawater intake opening 14.

As shown in FIG. 3, the front aggregate 5 _F , the central aggregate 5 _M and the rear aggregate 5 _A each have a semi-circular cross section, a circular cross section, and a semi-circle that are outwardly bent. A hollow steel pipe material having a uniform cross section can be adopted. With such a structure, the resistance to seawater inflow to the sea chest can be reduced.

[0017]

EFFECTS OF THE INVENTION According to the seawater intake lattice having such a structure, (1) three hollow steel pipe members having right-angled triangular cross-sections forming the front and rear parts and the central part of the aggregate, and the left and right parts are formed. Since the hollow steel pipe material having a square cross section produces buoyancy as a floating body in water, the weight of the whole seawater suction grid in water is considerably lighter than that of a conventional seawater suction grid of the same size. As a result, even one diver can easily open, close, remove, and attach the diver in the sea in a labor-saving and labor-saving manner. (2) The buoyancy of the seawater suction grid can be designed arbitrarily. If the buoyancy is large, the seawater suction grid can be maintained in a horizontal posture by its buoyancy even if the mounting bolt nut at the rear end of the seawater suction grid is removed. When dripping, the diver pushes the seawater intake grid downward and enters the inside of the seawater intake. Also, if the buoyancy is small, the seawater suction grid will be in a substantially vertical posture when the mounting bolt nut is removed, but even in that case, there is buoyancy.
Pushing up to a horizontal position is easy. (3) The front aggregate, the central aggregate and the rear aggregate each have sharp tips and the outer surface is on the same plane as the bottom shell plate, which reduces water resistance while the vessel is running. be able to.

In summary, according to the first aspect of the invention, in the rectangular seawater suction grid that is openably and closably mounted on the rectangular seawater suction port such as the bottom plate of the ship bottom, all of the front and rear aggregates and the left and right aggregates of the rectangular outer frame are included. Alternatively, a seawater intake grid of a ship that is simple and inexpensive, can be opened and closed and can be restored in a labor-saving and labor-saving manner by forming hollow steel pipes that form a large part and are watertightly closed at both ends. Therefore, the present invention is extremely useful industrially.

According to the second aspect of the present invention, in the rectangular outer frame according to the first aspect of the present invention, in the rectangular seawater inhalation grid having the central aggregate in the central portion thereof, both ends of the central aggregate are watertightly closed. Since it is formed of the hollow steel pipe material described above, the present invention is extremely useful industrially because the seawater inhalation grid having the central aggregate has substantially the same effect as that of claim 1.

According to the invention of claim 3, claim 1 or 2
In the above, since the front and rear aggregates and the central aggregate are hollow steel pipes having a semi-circular cross section that bends outward, a structure that can be opened and closed and restored with labor and labor is simple and inexpensive. The present invention is extremely useful industrially because a seawater suction grid for an inexpensive ship and a seawater suction grid with less suction resistance for external seawater are obtained.

According to the invention of claim 4, claim 1 or 2
The front and rear aggregates and the central aggregate have a sharp cross-section at the front end and a triangular cross-section on the outer surface that is a flat surface along the bottom plate of the ship. Structure that can be opened and restored In addition to the seawater intake grid for ships that is simple and inexpensive, the water resistance due to the seawater intake grid during navigation is reduced to obtain the seawater intake grid.
The present invention is extremely useful in industry.

[Brief description of drawings]

FIG. 1 is an enlarged view showing an embodiment of a seawater suction grid of the present invention and a bottom view taken along the line BB.

FIG. 2 is a vertical cross-sectional view showing a ship bottom outer plate portion including the seawater suction grid of FIG.

FIG. 3 is a vertical cross-sectional view showing a modified example of the seawater suction grid of FIG.

FIG. 4 is a transverse cross-sectional view of a bottom plate of a ship showing a procedure for opening a conventional seawater suction grid.

5 is an enlarged view showing the seawater inhalation grid of FIG. 4 and its B-
FIG.

[Explanation of symbols]

1 Ship bottom plate 2 Parallel grid plate 3 Corner plate 4 _L Left side aggregate 4 _R Right side aggregate 5 _F Front aggregate 5 _M Central aggregate 5 _A Rear aggregate 6 Hinge hardware 6 _C Clevis plate 6 _P Hinge pin 6 _I Inner plate 7 _A long hole 7 _F Bolt nut 8 L type mounting seat 9 Bolt nut 10 U type metal fitting 11 Seawater intake grid 12 Flat steel plate 13 Seawater intake port 15 Rectangular outer frame

Claims (4)

[Claims] 1. In a rectangular seawater intake grid that is openably and closably mounted on a rectangular seawater intake port such as a bottom shell plate, all or most of the front and rear aggregates and left and right aggregates of the rectangular outer frame are formed, respectively. A buoyancy type seawater suction grid, characterized in that it comprises hollow steel pipe material with both ends sealed in a watertight manner. 2. The rectangular outer frame according to claim 1, wherein a rectangular seawater inhalation grid is provided with a central portion aggregate in the central portion thereof, the central portion aggregate being formed of a hollow steel pipe material having both ends watertightly closed. The buoyancy type seawater inhalation grid characterized by the above. 3. The buoyancy type seawater suction grid according to claim 1 or 2, wherein the front and rear aggregates and the central aggregate are hollow steel pipes having a semicircular cross section that is convexly curved outward. 4. The cross section of the front and rear aggregates and the central aggregate according to claim 1 or 2, wherein the front ends of the aggregates are sharply pointed and the outer surface is a triangular cross section that is a flat surface along the bottom shell plate. A buoyancy-type seawater inhalation grid.