JPS58510A - Offshore working platform - Google Patents

Abstract

PURPOSE:To raise the stability of an offshore working platform by increasing the height of the upper deck to a desired one after landing plural legs on the bottom under water by using a method in which the offshore working platform for marine exploitation is made up of the upper deck and the lower deck, which can be superposed one upon another. CONSTITUTION:A working platform 1 with plural legs 2 and floating on the surface of water is divided into the upper working base 1-1 and the lower working base 1-2 which are formed in vertically movable manner relatively to plural legs 2. The working platform 1 is towed to a given place on the water surface, the legs 2 are brought down to some extent, the lower working base 1-2 is brought down into water through the legs by an elevator 3-1, the lower ends of the legs 2 are landed on the bottom, and then the upper working base 1-1 is lifted up above the surface of water.

Description

[Detailed description of the invention] The present invention relates to a floating platform.

As shown in FIG. 1, a conventional floating work platform is a deck work platform 01. A plurality of legs 0 passing through the deck workbench 01 in the vertical direction
2. Attached to deck workbench O1, each leg 02 is attached to deck workbench O1.
The deck lifting device 03 raises and lowers the deck work platform O1 by moving up and down relative to the deck work platform O1, and the steps for raising the deck work platform O1 are shown in FIGS.

After landing the leg 02 on the bottom in the order shown in (C), the deck workbench O1 is raised to the desired height above the water surface, and lowered in the reverse order to the above.

However, as the purposes of offshore development have diversified in recent years, the use of this type of floating work platform has expanded, and the weight of the work platform and its payload has increased. As the demand for new products has increased, conventional models have been limited in terms of application and are uneconomical.In addition, raising a large workbench above the water surface raises the center of gravity during work. This has also led to disadvantages in terms of stability.

The present invention was proposed in view of these circumstances, and aims to provide an economical floating work platform that lifts and lowers a relatively large deck work platform using a relatively small deck lifting device.
A horizontal work platform that floats on the water surface is raised by a lifting device after its legs touch the bottom of the water and brought to a desired height above the water surface, and the horizontal work platforms are superimposed. It is characterized by being separated into an upper deck platform and a lower deck platform.

An embodiment of the present invention will be described with reference to the drawings.

Figures 2 (A), (B), (C), and (D) are side views showing how to raise and lower the lift, and Figure 3 (A) is a side view showing an embodiment in which the present invention is applied to a jack-up type drilling rig. , the same figure (
B) is a bottom view of FIG. 4(A), FIG. 4(A) is a side view showing an embodiment in which the present invention is applied to jack-up type residential purge, and FIG. 4(B) is a bottom view of FIG. 4(A). It is.

In the above figure, l indicates the upper deck platform 1 which can be superimposed on each other.
The work platform is horizontally divided into two parts: 1 and a lower deck platform 1-2.The upper deck platform 1-1 becomes a work platform that can be lifted above the water surface, and the lower deck platform 1-2 is used to store fresh water fuel, etc. in the empty space. A plurality of legs 2 which vertically penetrate the upper deck platform 1-1 and the lower deck platform 1-2 serve as parts for accommodating objects; 3-1.3-
2 are upper deck platforms 1-1. The upper deck platform 1-1. is attached to the lower deck platform 1-2 by raising and lowering the legs 2. This is a lifting device that lifts and lowers the lower deck platforms 1-2 and fixes them at desired heights.

In such a floating work platform, first, in order to raise the upper deck platform 1-1 above the water surface.

From the state of FIG. 2(A), as shown in FIG. 2(B), the leg 2 is lowered to some extent by the lifting device 3-1, and then, as shown in FIG. 2(C), Lower deck platform 1-2
Lower both leg 2 and \ into the water. If the leg 2 has landed on the bottom 5 of the water in this way, it will be as shown in the same figure (D).

By operating the lifting device 3-1 of the upper deck platform 1-1, the upper deck platform 1-1 is brought to the desired height above the water surface, and once the positioning is completed, the floating work platform is connected to the mooring wire. Moor to the bottom of the water.

To bring upper deck platform 1-1 to its original position.

Perform the above steps in reverse order.

According to such a floating work platform, the upper deck platform 1-1 is reduced in size by one layer compared to a conventional single deck platform.
The capacity of the lifting device is small enough to suffice.

In addition, the lower deck platform 1-2 can avoid vertical movement due to waves by sinking to a position where it is less affected by waves, and heavy objects such as fresh water and fuel are stored therein.

When the lower deck platform 1-2 is lowered, the plurality of legs 2 are mutually restrained by the lower deck platform 1-2, so there is no deviation in the spacing between the legs, and the lower deck platform 1-2 is not affected by waves and also acts as a weight, so
The center of gravity of the entire floating platform is lowered, increasing its stability.

If the buoyancy of the lower deck platform 1-2 is reduced by injecting water into its internal space when it sinks into the water, the capacity of the lifting device can be reduced.

Furthermore, when the lower deck platform 1-2 is lowered, both the legs and the lower deck platform are lifted using the lifting device 3-1 of the upper deck platform 1-1, and when the lower deck platform is raised, both the legs and the lower deck platform are If you let it rise.

The elevating device 3-2 attached to the lower deck platform 1-2 can also be omitted.

In short, according to the present invention, a horizontal work platform that floats on the water surface is raised by a lifting device after a plurality of legs touch the bottom of the water to bring it to a desired height above the water surface. In the workbench, by dividing the horizontal workbench into an upper deck stand and a lower deck stand which can be superimposed, a floating workbench is obtained which reduces costs and improves performance.1 The present invention is extremely useful industrially. It is.

[Brief explanation of the drawing]

Figure 1 (AL (B), I (C), and Figure 2 (A), (C) are side views showing the steps for raising and lowering a known floating work platform, respectively.
B), (C), and (D) are side views showing the steps for lifting and lowering the floating work platform of the present invention, respectively, and FIG. 3(A) is a side view showing an embodiment in which the present invention is applied to a jack-up type drilling rig. FIG. 4(B) is a bottom view of FIG. 4(A), FIG. 4(A) is a side view showing an embodiment in which the present invention is applied to a jack-up type residence, and FIG. It is a bottom view of (A). 1. Work platform, 1-1. Upper deck platform, 1-2. Lower deck platform, 2. Legs, 3. Lifting device, 3-1. Upper deck. Lifting device for deck platform, 3-2... Lifting device for lower deck platform, sub-agent Masafumi Tsukamoto (and one other person) (A) (E3) (A) (B)

Claims (1)

[Claims] A horizontal work platform that floats on the water surface is raised by a lifting device after its legs touch the bottom of the water and brought to a desired height above the water surface, and the horizontal work platforms are superimposed. Floating work platform 0 characterized by being separated into an upper deck platform and a lower deck platform.