JPH0532398Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an anchor lifting machine for offshore structures in ice areas.

[Conventional technology]

Conventionally, an anchor lifting machine for mooring an offshore structure, such as an oil drilling rig, has a chain drum 1, a horizontal reduction gear 2, as shown in a side view of FIG. 4, a plan view of FIG. 5, and a front view of FIG. , horizontal reduction gear 3, drum brake 4, fluid brake 5, clutch 6, motor 7, and other mechanical parts and control parts are all assembled into a split or integrated bed plate 8, and the exposed deck A is installed.
It uses a horizontal type that is installed on top.

However, such a structure has the following drawbacks.

(1) When using in icy areas, the outside temperature is -10 to -
Since the temperature is 35℃, it is difficult to operate and maintain the anchor lifting machine in the open air.

(2) Since all mechanical parts are on exposed deck A,
The center of gravity of the oil drilling rig becomes higher.

(3) In order to install the mechanical parts, a considerable area on exposed deck A will be occupied.

(4) Due to the arrangement of the machinery hem, an overhang is required above exposed deck A.

(5) The wind pressure area of the oil drilling rig increases due to the mechanical parts.

[Problem that the invention attempts to solve]

This invention was proposed in consideration of these circumstances, and it makes operation and maintenance work in ice-cold waters easier, and by making effective use of narrow spaces, it reduces the size of offshore structures and improves their stability. The purpose is to provide an economical anchor hoisting machine for offshore structures in frozen areas.

[Means for solving problems]

To this end, the present invention is an anchor-lifting machine for offshore structures that is installed on offshore structures in frozen areas that have a flat exposed deck at the top. type motor,
A drive and braking unit consisting of a horizontal shaft type clutch, a horizontal shaft type hydraulic brake, a reduction gear, etc., a vertical drum brake mounted on the ceiling below the exposed deck in the same machine room, and a brake on the floor of the same machine room. and a vertical chain drum fitted to the upper end of a chain drum shaft extending vertically upward through the exposed deck. do.

[Effect]

With the above-described configuration, it is possible to obtain an economical anchor lifting machine for marine structures in frozen waters, which is easy to operate and maintain in frozen waters, downsizes offshore structures, and improves stability.

〔Example〕

An embodiment in which the present invention is applied to an oil drilling rig will be explained with reference to the drawings. Fig. 1 is a side view showing the equipment, Fig. 2 is a plan view showing the anchor lifting machine of Fig. 1, and Fig. 3 is a side view showing the equipment. is a front view of FIG. 2;

In the above diagram, the same symbols as in Figures 4 to 6 indicate the same members, and 1a is exposed deck A.
A chain drum is attached to the upper end of a drum shaft 9 that vertically passes through a bed plate 8a provided above, and the rotational force to the chain drum 1a is transmitted from a motor 7a to a horizontal reducer 3a, a clutch 6a,
The signal is transmitted via the vertical speed reducer 2a and the drum shaft 9.

4a is a brake drum mounted horizontally at a level directly below exposed deck A, approximately at the center of a drum shaft 9 extending vertically; 5a is a fluid brake; 2a to 7;
A is located in the machine room B directly below the exposure deck A.

In such a device, the machine room B, where the driving and control parts of the anchor lifting machine are located, is surrounded by an enclosure wall, so the environmental conditions are milder than in the outside air on the exposed deck A. In addition, the center of gravity of the driving and control parts of the anchor lifting machine on the offshore structure is lowered, and furthermore, the wind pressure area and exclusive area of the deck on the exposed deck A of the anchor lifting machine are reduced, and there is no need for a deck overhang. becomes.

According to such a structure, the following effects can be achieved.

(1) The environmental conditions for the drive and control parts of the anchor lifting machine will be improved, making operation and maintenance work easier in icy waters.

(2) Since the center of gravity of the anchor lifting machine is lowered, the center of gravity of the offshore structure is lowered and the stability of the offshore structure is improved.

(3) Since the wind pressure area on the exposed deck of the anchor lifting machine is reduced, the wind resistance of offshore structures is reduced.

(4) The area occupied by the anchoring machine on the exposed deck is small, and an overhang is not required, so the offshore structure becomes smaller.

[Effect of idea]

In short, according to the present invention, in an anchor lifting machine for marine structures that is installed on a marine structure in an ice area that has a flat exposed deck at the top, it is installed horizontally in a machine room that is isolated from the outside air directly below the exposed deck. A driving and braking unit consisting of a shaft type motor, a horizontal shaft type clutch, a horizontal shaft type hydraulic brake, a reduction gear, etc., and a vertical drum brake installed in the same machine room on the ceiling below the exposed deck. It is equipped with a hydraulic cylinder for operating the vertical drum brake mounted on the floor of the machine room, and a vertical chain drum fitted to the upper end of the chain drum shaft extending vertically upward through the exposed deck. As a result, we have developed an economical anchor-lifting machine for marine structures in icy waters that is easy to operate and maintain in icy waters, and makes offshore structures more compact and stable by effectively utilizing narrow spaces. Therefore, the present invention is extremely useful industrially.

[Brief explanation of the drawing]

Figure 1 is a side view showing an embodiment of the equipment for an oil drilling rig according to the present invention, Figure 2 is a plan view showing the anchor lifting machine in Figure 1, and Figure 3 is a front view of Figure 2. , Fig. 4 is a side view showing how a known anchor lifting machine for offshore structures is installed on an oil drilling rig, Fig. 5 is a plan view of the anchor lifting machine for offshore structures shown in Fig. 4, and Fig. 6. is a front view of FIG. 5; 1a...Chain drum, 2a...Vertical reducer, 3a...Horizontal reducer, 4a...Brake drum, 5a...Fluid brake, 6a...Clutch,
7a...Motor, 8a...Bed plate, 9
...Drum shaft, A...Exposed deck, B...Machine room.

Claims (1)

[Scope of utility model registration request] In an anchor lifting machine for offshore structures installed on marine structures in ice-covered areas that have a flat exposed deck at the top, a horizontal shaft type motor is installed in a machine room that is shielded from the outside air directly below the exposed deck. A driving and braking unit consisting of a clutch, a horizontal shaft type hydraulic brake, a reduction gear, etc., a vertical drum brake mounted on the ceiling below the exposed deck in the same machine room, and a shaft drum brake mounted on the floor of the same machine room. an icy area characterized by comprising: a hydraulic cylinder for operating the vertical drum brake; and a vertical chain drum fitted to the upper end of a chain drum shaft extending vertically upward through the exposed deck. Anchor lifting machine for offshore structures.