JPH036662Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a submersible submersible platform used for working in shallow water.

[Conventional technology]

There are conventional submersible underwater work platforms as shown in Figures 4 and 5, and on both sides of the underwater work platform 01 there are ballast tanks 02 that can be filled with water to control the floating and sinking of the underwater work platform 01. , 02 are provided respectively.

Therefore, when performing maintenance and inspection work on equipment on the underwater workbench 01, as shown in Fig. 4, the ballast water in the ballast tank 02 is discharged, and the buoyancy of the ballast tank 02 allows the ballast water to be submerged underwater. While the work platform 01 is floated and floated on the sea surface 03, when the underwater work platform 01 is used for underwater work, ballast water is injected into the ballast tank 02 as shown in Fig. 5. , the underwater work platform 01 is lowered and landed on the seabed 04.

[Problem that the invention attempts to solve]

However, with the conventional submersible underwater work platform as described above, when the underwater work platform 01 is submerged and operated in shallow waters, waves (see the chain line in Fig. 5) and currents (see the arrow in Fig. 5) ) etc.,
There is a problem that the underwater workbench 01 slides on the seabed 04.

In particular, the external force applied to the underwater work platform 01 by waves increases as the pressure receiving volume of the underwater work platform 01 increases, and the external force applied to the underwater work platform 01 due to tidal currents increases as the pressure receiving area of the underwater work platform 01 increases. growing.

The present invention aims to solve these problems, and is a floating type that reduces the pressure receiving volume and pressure receiving area during subsidence, thereby reducing the influence of external forces such as waves and currents. The purpose is to provide an underwater work platform.

[Means for solving the problem] For this reason, the floating underwater work platform of the present invention is equipped with a ballast tank that can be filled with water to control floating and sinking, and an opening formed at one end of the ballast tank. A buoyancy tank is fitted into the buoyancy tank so as to be protrusive and retractable, and a means for driving the buoyancy tank is provided.

[Effect]

In the above-described floating underwater platform of the present invention, when the underwater platform is submerged, ballast water is injected into the ballast tank, and the buoyancy tank is drawn into the ballast tank by the buoyancy tank driving means.

In addition, when the underwater platform rises, the ballast water in the ballast tank is discharged, and
The buoyancy tank is projected from the opening of the ballast tank by means of driving the buoyancy tank.

〔Example〕

Hereinafter, a floating type underwater work platform as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a sectional view thereof, Fig. 2 is a sectional view showing its submerged state,
FIG. 3 is a sectional view showing the floating state.

As shown in FIGS. 1 to 3, on both sides of the underwater work platform 1 of this embodiment, ballast tanks 3, 3, which can be filled with water and water for controlling the floating and sinking of the underwater work platform 1, are mounted on frames 2, 2, respectively. Injection of ballast water into these ballast tanks 3, 3 or discharge of ballast water from the ballast tanks 3, 3 is carried out using a pump (not shown) in the underwater work platform 1. It is done.

In addition, an opening 3 is provided at the bottom end of each ballast tank 3.
A is formed in the opening 3a, and a buoyancy tank 4 is fitted into the opening 3a so as to be protrusive and retractable.

In the ballast tank 3, a hydraulic cylinder 5 as a driving means for the buoyancy tank 4 is interposed between the ceiling surface of the ballast tank 3 and the top surface of the buoyancy tank 4.
When the hydraulic cylinder 5 is expanded, the buoyancy tank 4 is pulled into the ballast tank 3 and accommodated therein.
It is designed to protrude downward from a.

Note that a seal 6 is interposed between the opening 3a of the ballast tank 3 and the buoyancy tank 4 to keep the inside of the ballast tank 3 watertight.

Since the submersible underwater work platform as an embodiment of the present invention is constructed as described above, the underwater work platform 1
When sinking, as shown in Fig. 2, ballast water is injected into the ballast tank 3 by a pump (not shown), and the buoyancy tank 4 is drawn into the ballast tank 3 by the hydraulic cylinder 5, and is then lowered into the sea. The workbench 1 is lowered to the bottom of the seabed 7 and landed on the bottom.

On the other hand, when raising the underwater platform 1 from a submerged state as shown in FIG. 2, as shown in FIG. protrude from the opening 3a of the ballast tank 3,
An underwater work platform 1 is floated above the sea surface 8 while obtaining sufficient buoyancy.

As described above, in this embodiment, when the underwater work platform 1 floats, sufficient buoyancy is obtained from the ballast tank 3 and the buoyancy tank 4, while the underwater work platform 1
When the buoyancy tank 4 sinks, the buoyancy tank 4 becomes the ballast tank 3.
Since the ballast tank 3 is accommodated within the tank, the ballast tank 3 can be made considerably smaller than the conventional one, and the pressure receiving volume and pressure receiving area are reduced.

Therefore, when operating the underwater work platform 1 in shallow water, the influence of external forces such as waves (see the chain line in Figure 2) and currents (see the arrow in Figure 2) on the underwater work platform 1 can be greatly reduced. There is also the advantage that the weight of the underwater work platform 1 as a whole can be reduced.

[Effect of idea]

As described in detail above, the floating underwater work platform of the present invention is equipped with a ballast tank that can be filled with water to control its floating and sinking, and the buoyancy tank is installed in the opening formed at one end of the ballast tank. It has an extremely simple configuration in which it is inserted so that it can be extended and retracted, and a drive means for the buoyancy tank is provided, which reduces the pressure receiving volume and pressure receiving area when submerged, thereby reducing the influence of external forces such as waves and currents. In addition to being significantly reduced, there is also the advantage of reducing the weight of the entire underwater work platform.

[Brief explanation of drawings]

Figures 1 to 3 show a submersible underwater work platform as an embodiment of the present invention, and Figure 1 is a cross-sectional view of the platform;
Figure 2 is a cross-sectional view showing its submerged state, Figure 3 is a cross-sectional view showing its floating state, Figures 4 and 5 show a conventional submersible underwater work platform, and Figure 4 is its floating state. A front view showing the state, and FIG. 5 is a front view showing the submerged state. DESCRIPTION OF SYMBOLS 1... Undersea work platform, 2... Frame, 3... Ballast tank, 3a... Opening, 4... Buoyancy tank, 5... Hydraulic cylinder as driving means for the buoyancy tank, 6... Seal, 7... Undersea, 8...sea surface.

Claims (1)

[Scope of utility model registration request] The underwater work platform is equipped with a ballast tank that can be filled with water to control its floating and sinking, and the buoyancy tank is inserted into the opening formed at one end of the ballast tank so as to be able to protrude and retract. A submersible underwater work platform characterized by being equipped with a drive means.