JPH0586789U - Turret type mooring equipment - Google Patents

Abstract

(57) [Summary] [Objective] To provide a turret type mooring device which has an extremely small size and a simple structure and which can easily fix a chain and disconnect it in an emergency. [Composition] Chain pipe in the opening 2 of the floating structure 1.
In the turret type mooring device, in which the turret 21 having 22 is arranged and the other end of the chain 36 locked to the seabed is guided to the upper part of the turret 21 through the chain pipe 22, the floor of the turret 21 is arranged above the chain pipe 22. Attach the upper end metal piece 23 protruding to the surface and having the fitting groove 24 on the side,
Attach a fixing jig 28 that can be fitted into and removed from the fitting groove 24 on the side surface,
A slide ring 25 having an expanding portion that expands upward in the upper portion is arranged so as to be vertically movable along the upper end metal 23, and has a chain fitting portion 32 in the central portion,
In addition, the plug 31 having a tapered surface that fits into the expanding portion 27.
And a turret type mooring device in which the plug 31 can be divided at least in the chain fitting portion 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a turret type floating structure mooring device suitable as a mooring device for a floating structure such as a floating oil production and storage facility, and more particularly to a chain stopper structure of the mooring device.

[0002]

[Prior Art]

 Generally, in floating structures such as floating oil production and storage facilities, a turret type floating structure mooring device is used to enable the floating structure to pivot under sea condition while maintaining the floating position of the floating structure. ing. In this turret type floating structure mooring device, as shown in FIG. 5, a turret 3 is horizontally rotatably arranged in an opening 2 provided in the main body of a floating structure 1 and the bottom of the sea (not shown). The chain 4 whose one end is locked is guided to the upper part of the turret 3 through the fair leader 5 and the chain pipe 6, and the other end is locked by the chain stopper 7. In addition, 8 is a lower bearing and 9 is an upper bearing.

By the way, as shown in FIG. 6, the chain stopper 7 according to the existing technology is configured so that the plug 11 having the chain fitting portion is fitted to the expanded portion of the upper metal fitting 10 provided on the chain pipe 6 to move the chain 4 Although it is locked, since a large tension F is applied to the chain 4 at the time of mooring, it is difficult to raise the plug 11 above the upper metal 10 so that the chain 4 is released in an emergency. It was impossible.

In order to solve such a problem, as shown in FIG. 7, there is a method in which a windlass 12 is arranged on a turret 3 and the windlass 12 and a chain 4 are wound and moored. Further, as shown in FIG. 8, the turret 3 is divided into the upper structure 3a and the lower structure 3b, and the chain 4 is locked to the lower structure 3b. In an emergency, the lower structure 3b is separated and separated. The method to do is proposed.

[0005]

[Problems to be solved by the device]

 By the way, there is a problem in the chain disconnecting structure in an emergency in the conventional mooring device as described above. That is, when the windlass 12 shown in FIG. 7 is used, a large windlass 12 is required, resulting in an increase in weight and not only requiring an installation place but also an increase in manufacturing cost. On the other hand, the method of separating the lower structure 3b forming the turret 3 in FIG. 8 is also large and complicated, and as a result, there is a problem that the manufacturing cost becomes high.

[0006]

[Means for Solving the Problems]

 In the turret type mooring device of the present invention, a turret 3 having a chain pipe 6 is arranged in an opening 2 of a floating structure 1, and the other end of the chain 4 locked to the sea bottom is passed through the chain pipe 22 and an upper part of the turret 21. In the turret-type mooring apparatus, the upper end of the chain pipe 6 is attached to the upper surface of the turret 3, and an upper end metal member 23 having a fitting groove 24 is attached to the fitting portion 24. A fixing jig 28 is attached to the side surface, and a slide ring 25 having an expanding portion that expands upward is arranged on the upper side so that it can move up and down along the upper end metal 23, and a chain fits in the center part. A plug 31 having a portion 32 and having a tapered surface that fits into the expanding portion 27 is provided, and the plug 31 can be divided at least in the chain fitting portion 32.

[0007]

[Work]

 In the case of disconnecting the chain in an emergency, the turret type mooring device having the above-described structure is designed such that when the slide ring 25 is lowered along the upper metal part 23 after the fixing jig 28 of the slide ring 25 is first released. The slide ring 25 is released from the expanded part at the top. At this time, the plug 31 is held in position by the frictional force on the upper end of the upper metal piece 23. After that, the plug 31 is disassembled and the chain can be separated.

[0008]

EXAMPLES Examples of chain stopper structures in a turret type floating structure mooring device according to the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a partially cutaway side view of a chain stopper 20. An upper end metal member 23 is attached to an upper end of a chain pipe 6 attached to a turret 3 so as to project above a turret floor surface 21. A fitting groove 24 is provided on the side surface of the upper end metal piece 23.

A slide ring 25 is fitted to the upper end metal piece 23, and the slide ring 25 is arranged so as to be vertically movable along the upper metal piece 23 by a hydraulic cylinder 26 as a vertically moving device, and on the upper part thereof. An expanding portion 27 is formed which expands upward. Then, a fixing jig 28 is attached to its side surface. The fixing jig 28 is composed of a fixing dock 29 that is fitted into and disengaged from a fitting portion 24 provided on the side surface of the upper metal piece 23, and a hydraulic cylinder 30 that drives this.

Reference numeral 31 is a chain fixing plug, and this plug 31 has a chain fitting portion 32 formed in the central portion as shown in FIGS. A tapered surface is formed so as to fit into the expanded portion 27 at the upper part. The plug 31 is divided into a first plug unit body 31a having a lever 33a and a second plug unit body 31b having a lever 33b at a center chain fitting portion 32. The lever 33a and the lever 33b. And are connected by a tie bar 34. Further, one ends of wires 35a and 35b wound around winches (not shown) are fixed to the levers 33a and 33b, respectively.

In the chain stopper 20 having the above structure, when the floating structure 1 is moored by the chain 4, the slide ring 25 is first raised by the hydraulic cylinder 26 as shown in FIG. The cylinder 30 is operated to fit the fixing tongue 29 into the fitting portion 24 provided on the side surface of the upper metal piece 23. After that, the chain 4 is pulled up to the turret 3 through the chain pipe 6 and the upper metal fitting 23, and then the plug 31 is placed in the recess formed by the upper part of the sliding ring 25 and the upper metal fitting 23 and fitted into the fitting portion 32. The chain 4 is fitted and held. When the chain 4 is fixed in this manner, the tension F is retained by the upper metal piece 23.

Next, when the chain 4 is separated due to an emergency occurring during mooring, the hydraulic cylinder 30 is operated first to release the fixed dock 29. Then, the hydraulic cylinder 26 is operated to lower the slide ring 25 as shown by the dotted arrow. Next, when the wires 35a and 35b are wound up by a winch (not shown), the first plug unit body 31a and the second plug unit body 31b forming the plug 31 are indicated by solid arrows B centering on the pins 37a and 37b. Thus, the chain 36 can be separated by pivoting outward.

[0013]

[Effect of the device]

 In the turret type mooring device according to the present invention, a turret 3 having a chain pipe 6 is arranged in an opening 2 of a floating structure 1, and the other end of the chain 4 locked on the seabed is passed through the chain pipe 6 and the turret. 3 In the turret type mooring device guided to the upper part, an upper end metal member 23 protruding from the floor surface of the turret 3 at the upper part of the chain pipe 6 and having a fitting groove 24 on the side is attached to the fitting groove 24. A removable fixing jig 29 is attached to the side surface, and a slide ring 25 having an expanding portion that expands upward at the upper part is arranged so as to be vertically movable along the upper end metal 23, and at the center part. A plug 31 having a chain fitting portion 32 and a tapered surface that fits into the expanding portion 27 is provided, and the plug 31 can be divided at least in the chain fitting portion 32. Therefore, there is an effect that the chain can be easily fixed and separated in an emergency with an extremely small and simple structure.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a chain stopper structure of a turret type mooring device of the present invention.

FIG. 2 is a plan view of a plug in the turret type mooring device of the present invention.

FIG. 3 is a perspective view of a first plug unit in the turret type mooring device of the present invention.

FIG. 4 is an operation explanatory view of a chain stopper in the turret type mooring device of the present invention.

FIG. 5 is a schematic side view of a turret type floating structure mooring device.

FIG. 6 is an enlarged cross-sectional view of a chain stopper used in the turret type mooring device shown in FIG.

FIG. 7 is a partial schematic side view of another conventional turret type floating structure mooring device with an emergency disconnecting mechanism.

FIG. 8 is a schematic side view of still another conventional turret type floating structure mooring device with an emergency disconnecting mechanism.

[Explanation of symbols]

1 Main body 2 Opening part 3, Turret 4 Chain 5 Fairlead 6 Chain pipe 7, 20 Chain stopper 8 Lower bearing 9 Upper bearing 10, 23 Upper hardware 11, 31 Chain fixing plug 12 Windlass 24, Fitting groove 25 Slide ring 26, 30 Hydraulic cylinder 27 Expanded part 28 Fixing jig 29 Fixing dog 32 Chain fitting part of chain fixing plug 33a, 33b Lever 34 Tie bar 35a, 35b Wire 37a, 37b
pin

Claims (1)

[Scope of utility model registration request] 1. A turret in which a turret 3 having a chain pipe 6 is arranged in an opening 2 of a floating structure 1 and the other end of the chain 4 locked to the seabed is guided to the upper part of the turret 3 via the chain pipe 6. In the mooring device, an upper end metal member 23 projecting on the floor surface of the turret 3 and having a fitting groove 24 on its side is attached to the upper portion of the chain pipe 6, and a fixing jig 28 which can be fitted into and removed from the fitting portion 24. A slide ring 25 having an expanding portion that expands upward and is attached to the side surface so as to be vertically movable along the upper end metal 23, and has a chain fitting portion 32 in the center. And a plug 31 having a tapered surface that fits into the expanding portion 27 is provided, and the plug 31 is at least the chain fitting portion 32.
A turret type mooring device constructed so that it can be divided.