KR800000271B1 - Rising and falling apparatus supporting deck with legs - Google Patents

Abstract

an apparatus for fixing the platform in legs relatively, an apparatus for moving the legs and platform longitudinally, an apparatus for harmonizing with the stroke of cylinder, and preloading apparatus for the legs. This apparatus is operated continuously by the individual operations of said apparatus. Especially in the working deck in the sea, the erection was made effectively and surely.

Description

The lifting device of a deck

1 is a perspective view showing the appearance of an offshore structure with independent legs attached to the sea

2 is an overall perspective view showing one unit of the lifting device of the present invention

3 is a horizontal cross-sectional view taken along line III-III of FIG. 2

4 is a longitudinal sectional view taken along line IV-IV of FIG.

5 is a longitudinal sectional view taken along the line V-V of FIG.

6 is a diagram showing the lifting operation procedure of a general support leg part.

Fig. 7 Operation procedure for raising and lowering the independent leg part rapidly

8 is an explanatory diagram of the operation when the leg portion is fixed

Fig. 9 Operation explanation diagram when raising and lowering the deck

Explanatory drawing of state when preloading is applied to leg part by the deck which raised to FIG.

The present invention relates to an improved deck lifting device for offshore structures having a plurality of independent legs.

Offshore platforms with a plurality of independently operable legs are known as offshore structures for use in offshore oil drilling. Generally speaking, this type of marine platform has a plurality of supporting legs which can move in the longitudinal direction independently of the buoyant platform main body 01 and the main body 01, as shown in FIG. A main body which is provided on the main body 01 so as to be coupled to the part 02 and the respective supporting leg portions 02 and lift it up, and the main body supported on the sea surface at an arbitrary sea work position. Each support leg 02 is lowered to reach the sea floor by the operation of the elevating device 03, and then the main body 01 is raised to a certain height above the water surface to raise the main body 01 to the legs. It is installed at sea by fixing it horizontally on (02). This type of marine platform has the advantage that the platform can be installed hydroponically by adjusting the length of the end of each support leg that falls on the platform, even at significant slopes or ups and downs on the sea floor. Since the platform is supported on the sea floor by the small bottom of the part 02, the leg part 02 is likely to be sunk in the sea bottom, and thus a large load for each leg part in advance at the time of installing the platform to prevent the leg from sinking during operation. It is necessary to apply the preload to reach the legs to hard ground sufficiently.

In addition, since each leg has a different length of extension from the platform and a recess in the ground, it is necessary to fix the deck horizontally on the leg (height adjustment). Therefore, in the above-described lifting device 03 on the platform, generally, the operation of moving the leg portions 02 with respect to the platform 01 in unison or developmentally with each other in the longitudinal direction, the operation of applying preloading to the legs, To adjust the height, it is necessary to adjust the height of the lift slightly for each leg and to fix the leg and the platform firmly at the selected height.

The present invention provides a new type of elevator device including the function of each operation described above collectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIG. 2 in the drawings, (1) a buoyant platform, (2) a wall penetrating the platform 1 longitudinally, and (3) 2) a circumferential support leg, which is guided longitudinally past the inside and has longitudinal racks 4 on all sides thereof, 5 circumscribes the leg 3; Deck hoisting device installed on the platform. The lifting device 5 supports a rigid frame structure 6 and a frame structure fixed on the platform 1 as surrounding the support leg 3, between the top of the platform 6 and the platform sound 1. Between the upper ring 7 and the top of the frame structure 4 at circumferential intervals with the rigid upper ring 7 and lower ring 8 loosely coupled to allow longitudinal movement around the part 3. At one end of the set of four double-acting first fluid pressure cylinders 9 arranged longitudinally and extending downwards and the first fluid pressure cylinder 9 described above at the top of the frame structure and The above-described gears and a set of four gear jacks 10 which extend downwardly in parallel with the set of the hydraulic cylinders 9 and are arranged such that the extended ends thereof can penetrate the upper ring and move longitudinally with the upper ring. Four arranged between the extension end of the jack 10 and the lower ring 8 and extended downward Upper and lower protrusions 12 on the upper ring for detachably coupling the set of double acting second fluid pressure cylinders 11 and the extended end of the gear jack 10 and the upper ring 7 at its through part. The protrusions 13 are installed on the ring 7 and the lower ring 8 so as to be detachably coupled with the rack 4 on the support leg 3, respectively.

The wall 2, the top of the frame structure 6 and the inner surface of each of the upper and lower rings are grooves 14 corresponding to the racks 4 on the support legs 3, and thus the circumference of the support legs 3. Constrain the movement in the direction and move relative to the longitudinal direction only.

As shown in FIG. 3, the first fluid pressure cylinder 9 is framed at the end of the cylinder side as shown in FIGS. 3 and 4 at equally spaced positions in the circumferential direction corresponding to the rack 4 on the leg portion. The end of the piston rod is fixed to the connecting piece 15 fixed to the top of (6), and the connecting piece 16 fixed on the upper ring 7 is connected to the shaft in the direction tangential to each leg, respectively, It has a slightly larger stroke than one pitch of the rack.

As shown in FIGS. 4 and 5, the gear jack 10 extends through the hole 18 at the top of the frame structure 6 by extending the rod 17 mounted at the end of the housing shaft. A pad 19 overlapping the hard rubber and the plate is sandwiched between the upper and lower surfaces of the upper and lower surfaces thereof, and the upper end thereof is fixed to the top of the frame structure with the nut 20. The gear jack 10 is screwed into the inner cylinder 22 which is rotationally driven by the hydraulic motor 21 incorporated in the housing as shown in FIG. A distance equal to the length of the stroke of the first fluid pressure cylinder 9 is caused by the selective forward and backward operation of the infant motor 21 described above with the gear rod 23 extending downward in the housing. It is possible to draw out or pull in. It may be of a gear jack or a separate mechanical configuration using a rack and a pinion, or may be electric driven.

The extending end of the gear rod 23 becomes a solid block 24 having a circular cross section, loosely passing through the center of the longitudinal hole 25 laid on the upper ring 7, and the solid block 24 and the upper part. The rings 7 are combined to move relatively in the longitudinal direction. In the middle of the solid block 24, a groove-shaped rack 26 having a horizontal plane vertically on the side opposite to the leg 3 is formed.

The second fluid pressure cylinder 11 has the same stroke length as the first fluid pressure cylinder 9 and the gear jack 10, and is also disposed on the extension line of the gear jack 10 so that the end portion of the cylinder side can be removed. To the connecting piece 27 fixed to the lower end of the solid block 24 described above, and to the connecting piece 28 fixed to the end of the piston rod on the lower ring 8, respectively, in a tangential axis with respect to the legs, have.

The device 12 that detachably couples the upper ring 7 and the solid block 24 of the gear jack 10 to the outside of the longitudinal hole 25 on the upper ring 7 as shown in FIG. 3. The groove 29 formed in the tangential direction over the vertical hole 25 in the tangential direction centering on the near part, the cross beam 30 accommodated along the longitudinal direction in the groove 29, and the cross mentioned above. Fluid pressure for the cross beam drive connected to the cross beam 30 and fixed on the outer circumferential wall of the upper ring 7 so that the beam 30 can be reciprocally driven in the groove 29 in the radial direction of the ring 7. As the cylinder 31, when the groove 29 in the upper ring 7 and the rack 26 of the solid block 24 are aligned at the same height as shown in Fig. 4, the piston rod of the cylinder 31 is removed. Extend and extrude the cross beam 30 through the ribs 26 to the radially inner position of the ring through the longitudinal hole 25. 7 and the solid block 24, the combination does not move in the longitudinal direction, on the contrary, by the incoming drive (引入 驅動) the piston mode, the cylinder 31, and is loosen the coupling.

Further, the coupling device 13 between the ring and the shaft provided on the upper ring 7 and the lower ring 8 is in the radial direction of the ring toward the longitudinal column of the rack 4 on the leg 3. It consists of a pin block 32 housed in the ring so as to slide and a cylinder 33 fixed on the outer circumferential wall of the rings 7 and 8 so as to reciprocate the pin block 32. By extending the piston rod of 33), the pin block 32 is extruded and moved in the ring to the position where it is polymerized longitudinally with the rack 4, so that the ring and the leg 3 are moved relatively in the longitudinal direction. On the contrary, as the piston rod of the pin cylinder 33 is driven in and out, the pin block 32 is retracted in the ring and the coupler is released.

The dashed line shown in FIG. 4 shows that the first fluid pressure cylinder 9 or the second fluid pressure cylinder 11 extends and drives the piston rod so that the lower end of the upper ring 7 or the lower ring 8 can descend. The height is shown.

Next, the operation method of the elevating device 5 described above will be described. FIG. 6 shows a case in which relative longitudinal movement is performed between the platform 1 and the leg 3 (that is, when the leg is lifted on the lifted platform). And the normal operating cycle of raising the platform or lowering to the surface of the leg where it lands.

In FIG. 6 (a), the elevating device includes a solid block 24 and an upper ring 7 of the gear jack 10 coupled to each other at a position where the first fluid pressure cylinder 9 and the gear jack 100 are retracted. 12, the upper ring (7) is bonded by polymerizing the pin block 32 to the rack (4) of the leg portion, in this state the leg portion (3) on the support platform (1) the upper ring ( 7), supported by a gear jack (10), rigid frame structure (6), or a platform (1) on a rigid leg (3), frame structure (6), gear jack (10) and upper ring (7) It corresponds to the state supported by).

The lowering of the leg and the raising of the platform are performed by the same operation cycle of the lifting value in this state. First, at the height in which the second fluid pressure cylinder 11 is drawn in the state of FIG. 6 (a), the pin block 32 of the lower ring 8 is attached to the leg 3 as shown in FIG. 6 (b). After coupling, the pin block 32 of the upper ring 7 is released from the leg 3, and then the second fluid pressure cylinder 11 is calculated as shown in FIG. ) Is moved downwards or the platform 1 is moved upward in the longitudinal direction relative to the length of one stroke of the cylinder 11. At this time, the block 32 of the upper ring 7 is a height that can be coupled to the rack 4 of the upper pitch 1 directly on the leg portion, as shown in Figure 6 (d) of the upper ring (7) The pin block 32 is coupled to the leg portion, the pin block 32 of the lower ring 8 is released from the leg portion, and the second fluid pressure cylinder l1 is drawn in and driven as shown in FIG. The ring 8 is pulled up and the operation is repeated again in the order of (b), (c), (d), and (e) degrees. The rise of the leg and the lowering of the platform are performed by repeating (e), (d), (c), (b) and ⒜ in the reverse order of the above operation.

7 shows another operation cycle for performing the lowering and the raising of the leg portion 3 in a short time. In this case, the work is performed in a state where the cross beam 30 of the coupling device 12 is retracted and the upper ring 7 and the solid block 24 of the gear jack 10 are uncoupled. That is, in the state of FIG. 7 (a) in which the upper ring 7 and the leg portion 3 are coupled at the inlet position of the first fluid pressure cylinder 9, the first cylinder 9 as shown in FIG. 7 and (b). ), The leg 3 and the platform 1 are moved relatively in the longitudinal direction, and then the lower ring 8 at the retracted position of the second cylinder 11 as shown in FIG. The upper ring 7 is coupled to the part 3 and the upper ring 7 is unwound from the leg part 3, and the second cylinder 11 is extended as shown in FIG. 7 (d) to the leg part 3 and the platform 1. At the same time as the relative longitudinal movement, the first cylinder (9) is introduced to return the upper ring (7) to the upper position, and the upper ring (7) and the leg (3) as shown in FIG. ), Loosen the lower ring (8) and leg (3), and repeat the operation cycle in the order of (a), (b), (c), (d), (e), It is to descend the 2 stroke type leg part. And also in this case, the raising operation of a leg part is performed by repeating the above-mentioned operation in order of (e)-(a).

Next, in FIG. 8, when the plurality of leg portions descend by the above-described operation and reach the sea floor, the platform 1 is horizontally adjusted by the elevating apparatus, and the elevating apparatus 5 attached to the respective leg portions is shown. The operation procedure for matching the stroke is shown. The plurality of supporting legs dropped from the platform have different lengths reaching the sea floor by the unevenness or the inclination of the seabed, respectively, and the operating state of the elevating device attached to each leg portion at that time is also different.

In that case, the elevating device 5 independently of each of the leg portions, presses the last stroke of the leg portion supported by the seabed as shown in Fig. 8 (a) of the upper cylinder 9 Is done by.

If the lowering of the leg is in the state where the lower end of the second cylinder 11 is in the middle of the stroke, the second cylinder 11 is returned to the retracted position and the upper ring 7 is retracted from the retracted position of the first cylinder 9. This is combined with the leg (3), and uncoupling the lower ring (8) and the leg (3).

FIG. 8 (a) shows a state in which the coupling device 12 is uncoupled when it is engaged in such a state and then the first cylinder 9 is extended to support the leg 3 on the seabed. The height adjustment of the platform 1 is performed by extending the 1st cylinder 9 of the elevating apparatus 5 in the low side of a platform in this state again, and raising the low side of a platform to the leg part of the part.

After the height adjustment is completed, each lift device draws the gear jack 10 as shown in FIG. 8 (b), respectively, and the rack 26 of the solid block 24 is recessed in the upper ring 7. 29), and again with the coupling device 12, the solid block 24 of the gear jack and the upper ring 7 are engaged. Thus, the platform 1 is supported on the leg via the frame structure 6, gear jack 10 and the upper ring 7 of each rising seam, while each lifting device 5 is a second one. The cylinder 11 is arranged in the inlet position so that all the strokes can be driven synchronously at the same time.

9 shows the height adjustment and the stroke of the second cylinder 11, and then, using the pin block coupling device 13 of the second cylinder 11 and the upper and lower rings, the platform 1 on the leg portion. The operation | movement which raises is shown.

That is, FIG. 9 (a) shows a state in which the lower ring 8 is coupled to the leg 3 and the upper ring 7 is released from the leg 3 in the state of FIG. 8 (b). Next, as shown in FIG. 9 (b), the second cylinder 11 is simultaneously extended and driven to lift the platform 1 on the leg portion 3 by one stroke, and then the upper part as shown in FIG. 9 (c). The ring is coupled to the leg 3, and the operation is repeated again in the order of Figs. 9 (a), (b) and (c) to raise the platform 1 above the water surface.

FIG. 10 shows the state of the lift value when preloading is performed on the supporting leg during such a deck lift. That is, as shown in FIG. 1, in the platform, when the platform is raised to some extent from the water surface, two pairs of four supporting legs are set in diagonal directions, and the pair of legs and the platform are loosened, By loading the entire weight of the platform onto only two legs of the other set, it is possible to preload a load greater than the actual load on each leg. In this case, the elevating device of the present invention engages the upper and lower rings 7 and 8 with the leg portion 3 as shown in FIG. 10 through FIG. A system for releasing the engaging steel 12 between the ring 7 and the gear jack 10 and transferring the platform weight from the frame structure 6 to the first cylinder 9 and the upper ring 7, and the gear jack ( 10), the second cylinder 11 and the lower ring can be loaded to the leg by two systems of the system which transfers the preloading operation.

The structure as shown in FIG. 1 having the elevating device 5 described above between the platform 1 and its supporting leg 3 is lifted to a working position where the sea is required with the leg raised on the supported platform. Let's do it. The installation of the platform is carried out on the supported platform by lowering the legs 3 simultaneously or independently to the sea floor by the operation shown in FIG. 6 or FIG. After each leg portion 3 is independently recessed in the seabed and the platform 1 is horizontally adjusted on the leg portion, the stroke operation of the second cylinder 11 of each elevating device 5 is performed. Thus, the platform 1 is raised while keeping the platform 1 horizontally on the leg portion 3 by the operation of FIG. 9, and preloading is performed by the operation of FIG. 10 during the elevation, so that the leg part is sufficiently recessed in the sea floor, and the blue of the sea surface The platform 1 is fixed on the leg 3 at a position where the motion is not reached. Fixing the platform and the leg portion, the solid block 24 at the tip of the gear jack 10 is coupled to the upper ring (7) by the coupling device 12, the pin block coupling device 13 of the upper ring (7) By engaging the upper ring 7.

The platform and the leg can be fixed in the same way during the example and during the installation work, they can be fixed in the same shape immediately when necessary.

Since the platform and the leg portion are fixed by mechanical connection between the platform and the leg portion without using the fluid pressure of the first and second cylinders 9 and 11, the leg portion is extremely secure in any of the above-described cases. There is an effect that can be fixed to each other and the platform.

Also in this elevator. Since the upper and lower rings 7 and 8 are connected to the top of the frame structure via the respective jacks 9 and 11, the leg part 3 is the wall 2 and the frame structure 6. When inclined with respect to the platform 1 in the permissible range of, each ring 7, 8 buffers the fluid pressure of the respective jacks 9, 11 in accordance with the inclination of the leg 3. There is an effect of moving and maintaining the support surfaces of the pin block 32 and the rack 4 of each ring at all times in the front polymerization state to perform the same stable load transfer. At the same time, the construction is such that the load transfer between the platform and the legs is always performed when the upper and lower rings are engaged with the legs, while the lifting and lowering of the platform, the lifting of the platform, and the preloading are respectively performed. There is an effect that can be done in a constant state with the top part loaded.

Also in this elevating device, a gear jack 10 and a second fluid pressure jack 11 connected in series with the top of the frame structure and the lower ring 8 are connected, and the extension of the gear jack and the upper ring 7 are connected. Since the device 12 for attaching and detaching the upper and lower parts is installed in the leg lifting operation of FIG. 6 and the deck lifting operation of FIG. 9, the gear jack extension and the upper ring 7 are coupled to the device 12, It works well without loading fluid pressure on the jack 9 of the ring, and in that state, all the strokes of the second fluid pressure jack 11 are advantageously used for the deck lift in the deck lift of FIG.

In the elevating device, in the height adjustment operation of the platform shown in FIG. 8, the height of the upper ring 7 of each elevating device in which the platform is horizontally adjusted is combined with the coupling device 12, the gear jack 10, and the like. Since the rigid frame 6 can be mechanically fixed to the platform, the platform is always reliably secured while the deck of FIG. 9, which simultaneously controls the second cylinders 11 of the respective lifting devices simultaneously, is raised. It becomes possible to keep horizontal.

In addition, in the preloading operation of FIG. 10 by the elevating device, since the upper ring 7 and the lower ring 8 are simultaneously coupled to the leg portions by separate load systems, the large weight required for the preloading is And a plurality of pin blocks 32 attached to each of the upper and lower rings, and a plurality of racks 4 corresponding to the support ends, and are distributed to the leg portions, and thus, the first and second cylinders of the elevating device 5 ( 9), (11), gear jacks 10, pin blocks 32, and racks 4 on the legs can be economically designed with the minimum rated load required for general lifting of the legs or platform. Done.

The elevating apparatus of the present invention, as described above, is a detachable mechanism capable of reliably fixing the leg portion and the platform relatively, a mechanism for moving the relative bells relative to each other, a mechanism for adjusting the height of the platform and matching the stroke of the lifting cylinder. And a combination of preloading mechanisms for the leg portions, respectively, effectively and collectively, and these various mechanisms can be continuously and effectively operated by the respective operations described above. There is a structure such as an offshore workbench having a platform that can be moved relative to the wealth, and the installation work can be performed extremely surely and efficiently.

Claims (1)

In between the rigid frame structure fixed on the platform and the plurality of column racks of the support leg portion guided to the longitudinal through them and moving the platform and the support leg relative species, between the platform and the top of the frame structure The upper and lower pairs of rigid rings are loosely coupled around the support leg to allow longitudinal movement, respectively, and are individually mounted to be detachably coupled to the rack of the support leg by the coupling device of each ring. Between the top and the upper ring is axially connected with a plurality of parallel first sets of hydraulic pressure jacks extending longitudinally, Between the top of the frame structure and the lower ring by a plurality of gear jacks extending downwardly beyond the upper ring in parallel to the jack and a plurality of second sets of fluid pressure jacks connected in series and extending down again. And a device for attaching and detaching the gear jack extension portion and the upper ring therebetween.

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