JPS61155086A - Turret supporting apparatus of turret mooring ship - Google Patents

Abstract

PURPOSE:To enable a load to be uniformly borne by a number of supporting rollers for supporting a turret in the radial direction thereof by grouping the rollers into a plurality of groups and driving all the rollers by a common hydraulic supply system, thereby uniformly distributing the load on the circumference of the turret. CONSTITUTION:A number of supporting rollers 4 to support a turret in the circumference thereof are grouped into a plurality of groups X1-X6 each consisting of a plurality of the supporting rollers and respective hydraulic cylinders 5 for the respective groups are driven by a common hydraulic supply system. A hydraulic circuit 6 of each group is connected to a common hydraulic tube 7 through a selector valve 8. An accumulator 10 becoming operative by another selector valve 9 absorbs the vertical movement of the supporting rollers 4. Thus, the breakage of some supporting rollers due to an unbalanced load from the turret is prevented, thereby uniformly bearing a broadly distributed load.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support device for a turret in a turret muling ship.

[Conventional technology and its problems]

Around the world, offshore oil fields are being developed in deep water areas, areas with poor sea conditions, or abandoned locations due to low reserves. The so-called "turret muling" ship, which is easy to use, is attracting attention. As shown in Fig. 5, this ship has a turret (a turret) which is cylindrical and has a flange (201) (deck part) on the outside of the upper part, in a through hole (3) installed in the center of the hull (1). 2), and at the same time, a plurality of support rollers (4
), the turret (2) is rotatably supported by the bearing device via its collar (201), and the turret (2) is connected to a mooring line (6) and an anchor (6). The structure is equipped with multiple sets of mooring devices. This vessel has mooring lines and anchors (
6) is lowered radially from the turret, the turret (2) is fixedly moored directly above the oil well, and excavation is carried out using oil country pipes lowered through the inside of the turret (2). The hull on the outside of the turret is made to respond, and in reality, depending on the water depth of the floating location, sea conditions, etc., the hull side can freely rotate using a bearing device relative to the turret (2), which is moored with a mooring device. be able to do it,
The turret (2) (flange (201)) is mounted on the hull by absorbing the effects of tidal currents on the hull side, or by lowering the entire bearing device.
When the mooring cables extending radially from the turret (2) in all directions become twisted to some extent due to the turning of the ship due to tidal currents, etc.
The bearing device is raised so that the turret (2) can rotate, and while the rotation is braked by the braking device, the turret (2) is returned to rotation so that the twist in the mooring cable is restored.

By the way, as shown in FIG.
If the hydraulic cylinders (5) supporting each of the 3) are driven by separate hydraulic supply systems, the hydraulic cylinders (5) that support the 3) are actually used by 3 of the many support rollers (4) in the local direction. The turret (2 cylinders) is supported (P), which not only wastes the other support rollers, but also requires each hydraulic cylinder to be large enough to withstand a large load. There is.

On the other hand, in contrast to such a system, if a system in which all the support rollers are driven by one hydraulic supply system is used, support by all the support rollers is possible instead of the three-point support described above, but, In such a system, when the eccentric load from the turret is large, the support roller with the smaller load in the circumferential direction is pushed higher by the hydraulic cylinder, resulting in the turret being held tilted.

The present invention was made in view of these conventional problems, and
It is an object of the present invention to provide a mechanism in which the turret can be appropriately supported by a large number of support rollers. The turret is divided into multiple groups, and all hydraulic cylinders in each group are driven by a common hydraulic supply system.As a result, the turret is supported by groups of support rollers, and at least three supported by each support roller of the group. Furthermore, since each group is driven by an individual hydraulic supply system, even if there is an unbalanced load due to the turret ζ, the horizontality of the turret can be ensured by adjusting each group.

〔Example〕

Figures 1 and 2 show an embodiment of the present invention. A large number of support rows 2 (4) supporting the turret station direction are
A plurality of supporting rows 2 are taken as one group, and divided into nine plural groups, that is, groups from (Xr) to (tame),
All hydraulic cylinders (5) of each group (Xn) are driven by a common hydraulic supply system. In this embodiment, a plurality of support ronillas (4) adjacent in the circumferential direction are set as one group.

FIG. 2 shows an example of a hydraulic circuit for each group, which is connected to a common hydraulic pipe (7) via a switching valve (8).

An accumulator is provided in the hydraulic circuit (6) via a switching valve (9) so that the vertical movement of the support roller (4) can be absorbed by this accumulator (7).

In such a hydraulic circuit (6), the switching valves (8) and (9) are switched to the inward direction to drive each hydraulic cylinder (5) and raise the support roller (4).

In addition, the reverse latch switching valve (9) and αI are switched to the B direction to release the pressure of the hydraulic cylinder (5), and the support roller (4) is
lower.

FIG. 3 shows another embodiment of the present invention. In contrast to the above embodiment, in which adjacent support rollers are grouped, a plurality of support rollers (4) located at separate positions in the circumferential direction (in this embodiment) In the example, every other support roller) is selected and grouped, and the hydraulic cylinders (5) of each group are driven by a common hydraulic circuit (6a) (6b).

Further, as another embodiment, there is a method in which the plurality of groups shown in FIG. 1 are further grouped into several groups. For example, groups (Xl) and (X2), groups (X, )
(x4), groups (Xs), and (Xs)'B are each put together as a large group, and the small groups (Xn) within these large groups can be driven by a common hydraulic supply system. In this type of system, the hydraulic system is usually controlled in units of large groups, and if, for example, one of the small groups (Xn) that makes up the large group malfunctions, the hydraulic system is controlled in units of small groups. It is possible to adopt usage modes such as switching.

According to the above-described device, the pressure in the hydraulic cylinders (5) of each group (Xn) F'E is balanced to be uniform as shown in FIGS. All of the inner support rollers will support the load. Since support by the support rollers is thus performed in groups, the turret (2) is supported by a plurality of support rollers (4) in at least three groups.

Furthermore, since each group is driven by an individual hydraulic supply system, even if there is an unbalanced load on the turret (2), the l! Turret (
2) can be kept horizontal.

In addition, especially in the embodiment in which adjacent support rollers (4) are grouped together as shown in FIG. 1, the uneven load caused by the turret is particularly effectively countered by the plurality of hydraulic cylinders (5) that constitute these rollers. There is an advantage that it can be done. On the other hand, when supporting rollers (4) located at separate positions are grouped together as shown in FIG. Under such load conditions, there is an advantage that the load can be distributed over a wide range in the circumferential direction and can be uniformly received by the next support roller (4).

〔Effect of the invention〕

According to the present invention described above, the turret can be supported in an appropriate state by a large number of support rollers and hydraulic cylinders, and therefore, a situation where a specific support roller or hydraulic cylinder is damaged due to an uneven load on the turret can be avoided. In addition, it is possible to reduce the size of each hydraulic cylinder.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, with FIG. 1 being an explanatory diagram schematically showing groups of support rollers, and FIG. 2 being a hydraulic circuit diagram of each group. FIG. 3 is an explanatory diagram showing another embodiment of the present invention. Figure 4 (a) and (
B) is an explanatory diagram showing the driving state of the hydraulic cylinders of each group. 5 and 6 show a conventional turret-maring ship, with FIG. 5 being a cross-sectional view, and FIG. 6 being an explanatory view showing how the turret is supported by support loans. In the figure, (2) is the turret, (4) is the support roller,
(5) is a hydraulic cylinder, (6) is a hydraulic circuit, (Xi) ~
(X6) indicates each group of support rollers.

Claims (1)

[Scope of Claims] A turret support device in which a plurality of support rollers movable up and down by hydraulic cylinders are disposed on a hull deck so as to surround a through hole for loading a turret. A turret support device for a turret-marling ship, characterized in that the rollers are divided into a plurality of groups, and all hydraulic cylinders of each group are driven by a common hydraulic supply system.