JPS584682A - Trunk device for underwater operation - Google Patents

Abstract

PURPOSE:To enable the sink-and-float control of a trunk, by protruding a combination injection and drain pipe stop each buoyancy tank on both sides of a trunk for underwater operation to be attached to the bottom surface of a ship through packings. CONSTITUTION:A bottom underwater trunk 2 is provided with two packings on the edge of an upside opening, while a horizontal buoyancy tank 3 is installed along the upside circumference of the bottom underwater trunk 2. At the topside space of each buoyancy tank chamber 3a, a combination injection and drain pipe 6 is connected each, and with a valve 6a switched, compressed air can be fed to the buoyancy tank chamber 3a and/or it can be exhaust out to the atmosphere from the chamber 3a. In addition, at the bottom of each buoyancy tank chamber 3a, there are connected two combination injection and drain pipes 7 and each of the pipes 7 is set up protruded toward the underwater. For your reference, the combination injection and drain pipes 7 are usually open to the outside whereby the buoyancy tank chamber 3a is as well interconnected to outside water through.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trunk device used when performing underwater work such as offshore joining work and bottom maintenance work on a buoyant structure such as a ship or a floating dock.

In the past, various trunk devices have been developed for use in offshore joining work for modified ships, but all of them have problems in that they are complex in structure and require time and effort to attach to the ship's hull.

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems by providing a trunk device for underwater work that has a simple structure that facilitates floating and sinking control and that can be easily attached to a buoyant structure. shall be.

For this reason, the trunk device for underwater work of the present invention.

The buoyancy structure is equipped with a bottom underwater trunk that is attached to the lower surface of the bottom of the buoyancy structure via a gasket, and buoyancy tanks that are installed on the upper outer surfaces of both side walls along the longitudinal direction of the bottom underwater trunk. The tank is characterized in that an inlet/outlet pipe is connected in communication with the tank, and an inlet/outlet pipe is connected to the bottom of the buoyancy tank so as to project downwardly into the water.

Hereinafter, a trunk device for underwater work as an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a side view thereof, FIG. 2 is a sectional view taken along the line ■-■ in FIG.

As shown in FIG. 1, this trunk device includes a bottom underwater trunk 2 having an upper opening that extends in the lateral direction along the lower surface of the bottom of a buoyant structure floating on the sea surface and is in close contact with the lower surface of the bottom; A pair of side submersible trunks 2' are provided on the upper surfaces of both ends thereof, respectively, and have inner side openings that are watertightly connected and extend upwardly along both side surfaces of the buoyant structure l so as to allow close contact.

As shown in FIG. 2, the bottom underwater trunk 2 has two gaskets 5 at the edge of its upper opening.

A horizontal buoyancy tank 3 is provided along the upper outer periphery of the stationary submersible trunk 2.

The center of buoyancy of the horizontal buoyancy tank 3 is the bottom underwater trunk 2.
It is designed to be above the center of gravity.

The side underwater trunk 2' has two gaskets (not shown) on the edge of the inner frontage, and the lower ends of these gaskets are used to assemble the side underwater trunk 2' into the bottom underwater trunk 2. When attached, it is connected to the trunk 5 of the trunk 2.

As shown in FIG. 11, a vertical buoyancy tank 3' is provided on the outer surface of the side underwater trunk 2'.

By the way, the horizontal buoyancy tank 3 is divided into a plurality of buoyancy tank chambers 3a arranged in the longitudinal direction of the bottom underwater trunk 2.

An inlet/exhaust pipe 6 is connected to the upper part of the space in each buoyancy tank chamber 3a, and each inlet/exhaust pipe 6 is provided with a valve 6a.

By switching this valve 6a, compressed air can be supplied from an air supply source (not shown) to the buoyancy tank chamber 3a through this valve 6a and the inlet/outlet pipe 6, or
Compressed air can be discharged to the atmosphere through an inlet/exhaust pipe 6 and a valve 6a.

Further, two inlet/outlet pipes 7 are connected to the bottom of each buoyancy tank chamber 3a, and each inlet/outlet pipe 7 projects downward into the water. Note that the water supply and drainage pipe 7 is always open.
As a result, the buoyancy tank chamber 3aFi is always in communication with the outside water.

In addition, an inlet/outlet pipe 6 and an inlet/outlet pipe 7 to each buoyancy tank chamber 3a
An example of the arrangement is shown in FIG. 3.

With the above configuration, for example, in order to attach this trunk device to the buoyant structure 1, first fill the horizontal buoyancy tank 3 with appropriate water, and then insert the upper opening of the bottom submersible trunk 2 into the lower surface of the bottom of the buoyant structure 1. Then, compressed air is injected through the injection and exhaust pipe 6.

As a result, the water in each buoyancy tank chamber 3a is discharged through the inlet and drain pipes 7, so that the buoyancy increases.

The necessary tightening force is applied to the gasket 5, and the bottom underwater trunk 2 is fixed.

During this time, the internal pressure of the buoyancy tank chamber 3a is always balanced with the outside water pressure.

When the drainage is completed in this manner, the pulp 6ai is brought to a neutral position and closed.

This maintains the above state.

Further, the side underwater trunk 2/ may be attached to the buoyancy structure l and the bottom underwater trunk 2 separately using an appropriate turnbuckle or the like after the bottom underwater trunk 2 is attached as described above. With the side underwater trunk 2' attached to the bottom underwater trunk 2, the buoyant structure 1 is attached at the same time as the above-mentioned bottom underwater trunk 2 is attached to the buoyant structure 1.
It may be attached to.

In general, in order to perform work such as joining the seam A of the buoyancy structure l in this trunk device, the water in each buoyancy tank 3, 3' must be drained, and the water in each trunk 2, 2' must be drained. By discharging, a working space 4 communicating with each trunk 2, 2 may be formed in a state in which each trunk 2+'' is brought into close contact with the buoyancy structure l.

Next, in order to remove the trunk device from the buoyant structure 1 after completing the joining work, etc., operate the valve 6a to discharge the compressed air in the buoyancy tank chamber 3a to the atmosphere through the inlet/exhaust pipe 6 and the valve 6a. As a result, outside water is injected into the buoyancy tank chamber 3a through the inlet and drain pipe 7.

As a result, the buoyant force decreases and the single trunk device separates from the buoyant structure 1. During this time too,
The internal pressure of the buoyancy tank chamber 3a is always balanced with the outside water pressure.

As described in detail above, the trunk device for underwater work according to the present invention provides the following effects and advantages.

(1) By simply injecting, stopping, and discharging compressed air, the buoyancy tank can be freely filled and drained, making it extremely easy to control the weight in the water.

(2) When pouring water, the internal pressure of the buoyancy tank is always balanced with the external pressure of seawater, so the buoyancy tank can have a lightweight structure.

(3) Even if too much compressed air is sent, the compressed air escapes from the inlet and drain pipes, so the internal pressure does not become abnormally high.

(4) Since the inlet and drain pipes protrude downward into the water, the air in the buoyancy tank will not escape even if the trunk device is slightly trimmed or heeled.

[Brief explanation of drawings]

The figures show a trunk device for underwater work as an embodiment of the present invention.
A sectional view taken along the line ■-■ in the figure, and FIG. 3 is a schematic diagram for explaining the entire arrangement of the inlet and outlet pipes and the inlet and outlet pipes. 1. Buoyancy structure, 2. Bottom underwater trunk. 2'...Side underwater trunk, 3...Horizontal buoyancy tank, 3
a...Buoyancy tank chamber, 3'...Vertical buoyancy tank, 4...
Work space, 5e・Patsukin. 6... Inlet/outlet pipe, 6a... Pulp, 7... Inlet/outlet pipe, A
... seam. Sub-Agent' Patent Attorney Yoshihiko Iinuma

Claims (1)

[Claims] The buoyancy structure includes a bottom underwater trunk that is attached to the bottom surface of the buoyancy structure via a gasket, and buoyancy tanks that are respectively provided on the upper outer surfaces of both side walls along the longitudinal direction of the bottom underwater trunk. The buoyancy tank is characterized in that an inlet/outlet pipe is connected in communication with the buoyancy tank, and an inlet/outlet pipe is connected in communication with the bottom of the buoyancy tank so as to project downwardly into the water. Trunk device for underwater work.