JPS6112318Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an underwater work box for underwater repair of bent propeller blades on ships.

When repairing a bent propeller blade on a ship, the propeller blade must be heated with a gas burner or the like to correct it, so it is necessary to expose the propeller blade above the water surface.

By the way, if a propeller blade is bent due to a collision with driftwood, etc. on a ship during a voyage, if the ship is equipped with a ballast tank,
It is possible to carry out repair work at sea by tilting the ship's body by moving ballast, cargo, etc. and exposing the propeller blades above the sea surface, but this is not the case if the ship is not equipped with a ballast tank. Since it is not possible to expose the propeller blades above the sea surface by tilting the hull, the method used is to put the propeller in a dock after returning to port and repair the propeller.

This idea was made in consideration of the above circumstances, and the box that surrounds the propeller blade is divided into upper and lower halves and formed watertight, and this box is attached to the hull and the water inside is drained. To provide an underwater work box which allows repair work to be performed inside the box by exposing the ballast tank, and allows repair work to be easily performed during navigation even in a ship not equipped with a ballast tank.

This invention will be explained below based on an embodiment shown in FIGS. 1 to 3.

The underwater work box of this invention is divided into an upper box half 1 and a lower box half 2. Both boxes 1 and 2 are formed into a box shape with open upper and lower surfaces facing each other using flexible water-resistant sheets 3 on the walls, and flange portions 4 provided around the upper and lower openings. ，
5 are connected to each other via fasteners 6 such as bolts and nuts, so that each opening is kept watertight. Furthermore, on the walls of the upper box 1 and the lower box 2 made of the water-resistant sheet 3, a large number of flexible shape-retaining members 7 made of synthetic rubber or synthetic resin are integrally arranged in a lattice pattern. The shaped member 7 is provided with air chambers 8 and 9 that communicate with each other, and when air is pressurized into the air chambers 8 and 9, the boxes 1 and 2 maintain a predetermined shape. There is. Further, a rectangular reinforcing frame 10 is attached to the inside of the water-resistant sheet 3 so as to be inscribed therein. This reinforcing frame 10 is
A plurality of reinforcing frames 10 are provided at intervals in parallel with the flange portions 4 and 5, respectively, and each reinforcing frame 10 is separated at a predetermined interval by a safety fitting 11 consisting of a turnbuckle 11a inserted between adjacent reinforcing frames 10. is fixed.

The water-resistant sheet 3 is a fireproof sheet with a cloth-filled rubber sheet pasted on one side, and is used with the cloth-filled rubber sheet side facing outside.

Further, the air chambers 8 and 9 of the upper box 1 and the lower box 2 are arranged such that their open ends communicate with each other via the flanges 4 and 5, respectively.

And, on the upper wall 1a of the upper box 1,
A pair of cylindrical entrances and exits 12 leading to the inside of the box,
12 protrudes upward and its tip is inclined toward the side walls 1b, 1b of the upper box 1, and hanging fittings 13, 13 are provided at the upper center of the side walls 1b, 1b. ing. The flange portion 4 also includes a front wall 1 of the upper box 1.
A semi-circular recess 4a is formed in the center on the c side, and a semi-arc shaped bag body 14 made of synthetic rubber or synthetic resin is provided in this recess 4a. This bag body 14 has an air storage chamber 14a inside.
is formed, and this air storage chamber 14a is communicated with the air chamber 8 of the wall shape retaining member 7. Moreover, the air chambers 15 are vertically formed around the entrances and exits 12 by the shape-retaining member 7, and a plurality of annular frames 16 are provided vertically and inscribed at intervals. ing. The air chamber 15 is provided with an air inlet 17 at its upper end, and communicates with the air chamber 8 of the shape retaining member 7 on the wall surface at its lower end.

A fixing device 18 is provided on the lower wall 2a of the lower box 2 for fixing the lower box 2 to the hull.
and a balance mechanism 19 for preventing the lower box 2 from swinging. Further, the flange portion 5 of the lower box 2 is connected to the front wall 2 of the lower box 2.
A semi-circular recess 5a is formed in the center on the b side symmetrically with the recess 4a of the upper box 1. Similarly to the upper box 1, a bag body 20 formed in a semicircular arc shape is provided in this recessed part 5a, and the air storage chamber 20a of this bag body 20 is the air chamber of the shape-retaining member 7. It is connected to 9.

The fixing device 18 is configured to fix the lower box 2 to the keel of the hull, and includes a keel holding member 1 having a recess 18a that fits into the keel.
8b, and bolt 18c to this keel holding material 18b.
The keel holding member 18b is attached with its concave portion 18a facing from the front wall 2b of the lower box 2 toward the rear wall.

Further, the balance mechanism 19 has floating bodies 19b provided at both ends of arms 19a extending in a direction perpendicular to both side walls 2c of the lower box 2 and outward from each side wall surface.

As shown in FIG. 3, a sealing O-ring 21 is provided between the flanges 4 and 5 of the upper box 1 and lower box 2, and between the air chambers 8 and 9 facing each other. An annular sealing material 22 is provided in the air chambers 8 and 9 to allow watertight communication between the air chambers 8 and 9. When the upper box 1 and the lower box 2 are connected, the semicircular arc-shaped bags 14 and 20 form an insertion opening 23 through which a propeller shaft of a ship is inserted. The diameter D of this insertion port 23 is
By increasing the pressure in the air storage chambers 14a and 20a of the propeller, it is possible to closely contact the propeller shaft. 4b in the figure is a side edge provided around the outer periphery of the flange portion 4 of the upper box 1 so as to protrude downward from the lower surface of the flange portion 4, and the flange portion 5 of the lower box 2 is fitted inside the side edge 4b. When the flanges 4 and 5 are assembled, the flanges 4 and 5 can be easily aligned. Further, 24 is a ladder for workers to descend into the box from the entrance/exit.

Hereinafter, the case where the underwater work box configured as described above is attached to the hull will be explained with reference to FIG. 4.

First, the lower box 2 is lowered into the water, and the recess 18a of the keel holding member 18b is inserted into the keel part B of the hull A.
At the same time, position the bag body 20 on the propeller shaft E of the propeller c, and then tighten the bolt 18c and the holding plate 18.
Fix at d. The upper box 1 is then lowered into the water and connected to the lower box by means of a fastener 6. At this time, a sealing O-ring 21 and a sealing material 22 are placed between the respective flanges 4 and 5. Further, the tip of the entrance/exit 12 of the upper box 1 is made to protrude into the sea. Next, air inlet 17
Air is sent into the air chamber 15 from the air chamber 15. Air chamber 15
The air sent inside flows into the air chambers 8, 9 and the air storage chambers 14a, 20a, which are connected to each other, and the upper and lower boxes 1, 2, which have been in a contracted state, are expanded by the air pressure and assume a predetermined shape. At the same time, the upper and lower boxes 1 and 2 and the propeller shaft E are held tightly and watertight. After the air is injected, the air inlet 17 is closed and the inlet/outlet 1 is closed.
2, a worker (diver) enters the box using the ladder 24, fixes each reinforcing frame 10 inside the box with the safety fittings 11, and fixes the propeller C and the side opposite to this propeller C. The turnbuckle 11a is inserted between the flanges 4 and 5 of the box 2 located at the propeller shaft E.
The box 2 is supported in the axial direction of the box 2, and the water inside the box is then drained using a pump or the like. When draining the water inside the box, the air pressure in the air chambers 8, 9 of the upper box 1 and lower box 2 is kept high enough to withstand the water pressure outside the box. The safety fitting 11 functions to prevent the box from being crushed by water pressure.

After draining the water, repair work on propeller C is carried out in the space inside the box.

After the work is completed, the upper and lower boxes 1 and 2 are disassembled in the opposite manner to the above, reduced in size, and stored appropriately in a storage compartment. Since it is flexible, if the safety fitting 11 is removed from the reinforcing frame 10, it can be compressed in a direction that narrows the gap between the reinforcing frame 10 and the frame 16, and then stored in a smaller size.

As explained above, with this invention, the propeller blades are exposed in the space formed inside the box by attaching it to the hull and draining the internal water, allowing repair work to be carried out safely inside the box. Therefore, even if a propeller blade becomes bent during navigation on a ship without a ballast tank, it can be easily repaired without having to put it in the dock. This eliminates the need for the conventional work of moving cargo and tilting the ship to expose the propeller blades to the sea, improving work efficiency and making it possible to repair propeller blades safely.
Moreover, since it can be compressed and made small, various effects such as convenience for carrying are produced.

Furthermore, since the actual repair work is carried out in a work space completely divided by the upper box and the lower box, danger can be kept to a minimum even when the temperature is low.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention. Figure 1 is a front view, Figure 2 A and B are perspective views of the main parts in Figure 1, and Figure 3 is the main parts. FIG. 4 is an explanatory diagram of the use of an underwater work box according to an embodiment of this invention attached to a ship's hull. 1... Upper box, 1a... Upper wall, 1b...
Side wall, 1c...Front wall, 2...Lower box, 2a
...Bottom wall, 2b...Front wall, 2c...Side wall, 3...
... Waterproof sheet, 8, 9 ... Air chamber, 12 ... Doorway, 15 ... Air chamber, 18 ... Fixing device, 23
...Insertion port.

Claims (1)

[Scope of utility model registration request] Wall surfaces 1a, 1 are provided with flange portions 4, 5 at the openings and are formed of a flexible water-resistant sheet 3.
b, 1c, 2a, 2b, 2c are provided with flexible shape-retaining members 7 that maintain a predetermined shape by pressurizing air into the air chambers 8, 9, and the flange portions 4, 5 are attached to each other. It is equipped with an upper box 1 and a lower box 2 which are integrally joined to each other by a fastener 6 to form a working space therein, and a propeller shaft E is attached to the flanges 4 and 5 in a watertight manner. An insertion opening 23 is formed for insertion, and an entrance/exit 12 for the worker is provided in the upper box 1 to project upward, and a fixing device 18 for fixing the lower box 2 to the hull A is provided in the lower box 2. An underwater work box characterized by the following: