JPS61151306A - Elevator type working barge - Google Patents

Abstract

PURPOSE:To lessen the time of vertically shifting a working barge and improve working safety by relocating the working barge vertically, with each of a plurality of elevation adjuster link rods put through its counterpart elevation adjuster, and providing a space wherein to accommodate the lower portion of the link rod. CONSTITUTION:To lower a bolster leg 2, the engagement between a pawl 31 and a notch 32 is released after a pawl 30 is engaged with a notch 32 at a proper position on the bolster leg. To move each elevation adjuster 9, a piston 20 moves up over a certain stroke, with moving up an elevation adjuster link rod 10 as much as the piston stroke to follow. Then, an elevation adjuster mounting frame 14 moves up over a given stroke, together with the elevation adjuster link rod, and thereafter, the pawl 30 is engaged with the notch 32 on the bolster leg, followed by releasing the engagement between the pawl 31 and the notch 32, thereby it becomes possible to move up and down the working barge over a range exceeding the length of said link rod, provide the lower portion of said link rod freedom from being submerged in the sea water, and thereby protect the plurality of the elevation adjuster link rods against rusting.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the structure of an elevating work barge, and in particular, the present invention relates to the structure of an elevating work barge, and in particular, to a structure that allows the work barge to move from the sea surface to a safe space over a plurality of legs that are independent on the seabed. The present invention relates to a structure of an elevating work barge that can significantly reduce the time required to raise it and the time required to lower it from a safe space to the sea surface, and which can also have a large elevating stroke.

[Conventional technology]

There are various types of elevating mechanisms used in elevating work platforms that can be raised and lowered along multiple (usually 3 to 4) legs that stand on the seabed, but among them, the structure is simple. A bin-and-slot type lifting mechanism is used because of its low manufacturing cost. In this pin-and-slot system, bottles are inserted into slots formed at predetermined pitch intervals in the leg 11CG, and the work barge is raised and lowered using the pins.

However, with the conventional bin-and-slot type lifting mechanism, the work barge was raised and lowered mainly by taking measures by inserting and pulling out the upper and lower pins into each slot. Unfortunately, the lifting and lowering operations were extremely slow and required a great deal of effort and time. For this reason, a large amount of preparation time is required before and after offshore work, and also during the time it takes to drain the work barge from the water surface and raise it to a safe space, or until it is completely lowered from a safe space to the water surface and floats by its own buoyancy. The disadvantage was that there was a high risk of accidents occurring.

Note that the safe space is a position sufficiently high above the sea surface that external forces due to waves do not reach the work barge.

In order to solve the above-mentioned drawbacks, the present applicant previously proposed a method in which a rod of a predetermined length was suspended from a position above the water surface of the leg.
An elevating work barge, characterized in that the rod is fitted into a lifting device installed on the work barge, and the lifting device is moved up and down along the rod to move the work barge up and down. (Japanese Patent Application No. 58-94975).

[Problems to be Solved by the Invention] However, in this elevating type work barge, as in many conventional elevating type work barges having a bin-and-slot type elevating mechanism, the work barge does not reach the water surface. When the legs are thrown into the seabed in a floating state, the wires are unwound using a winch installed on the work barge, and each leg is lowered from the K.

Therefore, even if it is used as a mooring winch, consideration must be given to the winch, wires, etc., and the wires, etc. that are immersed in seawater must be maintained and managed.

Further, in this work barge, the lifting stroke of the work barge by the lifting device is limited by the length of the rod, and there is a problem that it cannot be used in water areas where a longer lifting stroke is required.

[Means for solving problems]

According to the present invention, in order to solve the problems of the prior art as described above, a lifting device has a rod of a predetermined length suspended from a suitable height above the water surface of the legs, and the rod is installed on a work platform. by fitting the lifting device through the rod, moving the lifting device up and down on the rod, and changing the suspended position of the rod with respect to the leg while maintaining the relative position between the lifting device and the leg. An elevating type work barge is provided, characterized in that the work barge is moved up and down, and the work barge is provided with a swivel for receiving a lower part of the rod when the rod is moved up and down.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view showing the main parts of an embodiment of the lifting type work barge of the present invention, FIG. 2 is a longitudinal sectional view of the lifting equipment, and FIG. 3 is a vertical sectional view of the lifting type work barge of the present invention. FIG. 2 is a side view showing the overall configuration of one embodiment.

As shown in FIG. 3, the work barge 1 is provided with a plurality of legs 2 that fit through the barge 1 in the vertical direction. In this embodiment, the work barge l has a substantially square planar shape, and legs 2 are provided at each of its four corners.
Two of them are shown in the figure. From the work barge 1, the lower legs 2 can be lowered to stand on the seabed 5.

When carrying out work at sea, in advance, the work barge 1 is moved from the state shown in Fig. 3 (the state in which the work barge 1 is floating on the water surface 6) along each leg 2 that is independent on the seabed. must be raised to a safe space above the water surface. Moreover, after the work is completed,
In the reverse procedure, it is necessary to lower the work barge 1 onto the water surface 6, and then raise each leg 2 to make it movable on the water surface 6 so that it can be towed to the destination.

In addition, in the working area, it is necessary to raise and lower the work barge 1 along a plurality of legs 2 that are independent on the seabed, and a lifting device 7 for this purpose is installed on the work barge 1 for each leg. It is provided for each.

A structural example of the lifting device 7 will be described below with reference to FIGS. 1 and 2.

On deck girders are installed around each leg 2 on the work barge 1.
8 is fixed, and a pair of lifting devices 9 are installed on both sides of the legs 20 on this O/D/Ki girder. The illustrated lifting device 9 is a center hole type jar.

Pearo, Kuja, and Ki (with a strong mouth with a rod that penetrates the center hole and a perch).

(the rod can be extended or retracted). A rod 10 is fitted into each lifting device 9 in the vertical direction.

The upper end of each rod IO is suspended from a pedestal 14. Two claws 30 are provided on the pedestal 14 at opposing positions with respect to the leg 2 so as to be movable horizontally toward the leg 2.

The movement of this pawl 30 is controlled by a hydraulic cylinder 33. Grooves 32 for engaging the claws 30 are formed in the leg 2 at predetermined pitch intervals in the vertical direction. By releasing the engagement between the pawl 30 and the groove 32 using the hydraulic cylinder 33, the pedestal 14 can be moved up and down using the legs 2KG.

The elevating device 9 composed of the pair lock jacks is fixedly supported by the on-deck girder 8, and the cylinder 19
and a piston 20 fitted in the cylinder, each of which is provided with pair locks 21 and 22 that fit with the rod 10. These bear locks 21t22 can be controlled into either a closed state in which they are tightly fitted to the rod 10 or an open state in which they are movable along the rod 10.

The opening and opening states are normally controlled by hydraulic pressure, and when the hydraulic pressure is activated, the pressurized opening is in the locked state, and when the hydraulic pressure is released, the opening and closing state is controlled. A pressureless mouth that exhibits

There are two types of locks: 21°22
It is also possible to use either method. Further, hydraulic pressure is applied to the cylinder 19 from either the direction of arrow A or the direction of arrow B, and the operation of the piston 20 is thereby controlled.

The work barge 1 is provided with two claws 31 movable horizontally toward the leg 2 at positions corresponding to the grooves 32 formed in the leg 21C. The movement of this claw 31 is controlled by a hydraulic cylinder 34. Hydraulic cylinder 34
By releasing the engagement between the claw 31 and the groove 32, the work barge 1 can move up and down on the legs 2.

At a position directly below each rod 10 on the upper part of the work barge 1, there is a space 36 for receiving the lower part of the rod 10 when the rod 10 moves downward relative to the work barge 1. The space 36 does not penetrate the bottom of the work barge 1.

The elevating and lowering operations of the elevating type work barge of this embodiment will be explained below.

The work barge 1 is towed to the work area with its legs 2 raised. This push-up state is performed by fitting the claw 31 into a groove 32 at an appropriate position on the leg 2.

Next, the landing gear 2 is lowered to the 1 work barge IK. To lower the leg 2, first fit the claw 30 into the groove 32 at an appropriate position on the leg 2, then release the claw 31 from the groove 321C, and then operate the lifting device 9. .

The operation of the lifting device 9 at this point is performed as follows. That is, first, open the pair lock 22 on the piston 20 side,
In this state, open the bear lock 21 on the cylinder 19 side,
In this state, the piston 20 is lowered by supplying hydraulic pressure from arrow A, and the rod 10 is lowered by that stroke.
descend.

Next, put the pair lock 21 in the open state and press the pair lock 21 in the open position.
2 is in the open state, supply hydraulic pressure from arrow B♂
Only stone 20 is raised. Next, the pair port 22 is set to the closed state again, the pair port 21 is set to the open state, and the piston 20 is moved by supplying hydraulic pressure from the arrow A.
At the same time, the rod 10 is lowered by one stroke. By repeating this operation six times, the rod lO
extend downward by a predetermined stroke. Rod 10 at this time
Even in the lowest position of the rod 10, which corresponds to the maximum travel stroke of
will not reach the bottom of the

In this way, after lowering the leg 2 together with the frame 14 by a predetermined height, the claw 31 is fitted into the groove 32 at an appropriate position on the leg 2, and after the leg 2 is fixed to the work barge 1, the claw is removed. 3
0 is released from the groove 32, and then the lifting device 9 is activated.

The operation of the lifting device 9 at this point is performed as follows. That is, first, the bare port 22 on the piston 20 side is locked, and the pair lock 21 on the cylinder 19 side is opened,
In this state, the piston 20 is raised by supplying hydraulic pressure from arrow B, and the rod 10 is moved up by the stroke.
to rise.

Next, the pair port 21 is locked and the pair port 21 is locked.
2 is in the open state and hydraulic pressure is supplied from the arrow to lower only the piston 20. Next, the pair port 22 is locked again, the bear lock 21 is unlocked, and hydraulic pressure is supplied from arrow B to cause the piston 20 to move.
At the same time, the rod IO is raised by one stroke. By repeating this operation an appropriate number of times, the rod 10 is extended upward by a predetermined stroke (ie, the same stroke as when the rod 10 was moved downward).

In this way, after the pedestal 14 is raised by a predetermined stroke together with the rod 10, the claw 30 is fitted into the groove 32 at an appropriate position of the leg 2, and then the claw 31 is disengaged from the groove 32.

Thereafter, by repeating the same operation, the legs 2 can be attached to the seabed 5.

Next, the work barge 1 is moved to the safe space 11 by being raised along the legs 2. This lifting of the work barge 1 is carried out in exactly the same procedure as in the case of landing the legs 20 on the bottom.

When the work barge 1 is lowered from the safety space 11 to the water surface 6 after the work is completed, and when the legs 2 are detached from the seabed 2 and raised, the procedure for lowering the legs 2 and raising the work barge 1 is reversed. Just follow the steps.

〔Effect of the invention〕

According to the present invention as described above, the work barge can be raised and lowered over a distance exceeding the length of the mouth, and the legs can be lowered from the work barge to the seabed or raised from the seabed. The operation can also be performed continuously in the same manner as the lifting and lowering of the work barge. Therefore, the barge can be maintained at a required height according to changes in weather and sea conditions, and the sea conditions in which it is used are not limited to a narrow range. Additionally, it is no longer necessary to use winches and wires to insert the legs, touch the bottom, and raise the legs after the hull has landed on the water, which simplifies the mooring winch and reduces the burden of maintaining and managing wires, etc. Ru. Furthermore, according to the present invention, the movement stroke of the rod by the elevating device can be increased, and the number of times the rod must be changed to a suspended position can be reduced.

In addition, even if the movement stroke of the rod is made large, the lower part of the rod will not be immersed in the sea surface, and it is possible to prevent rust etc. from forming on the rod, which needs to maintain high accuracy.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the main parts of the lifting type work barge of the present invention, FIG. 2 is a vertical cross-sectional view of the lifting equipment, and FIG. 3 is the overall configuration of the lifting type work barge of the present invention. FIG. 1: Work barge, 2: Legs, 8: On-deck girder, 9:
Lifting equipment, 10: Rod, 14: Frame, 19 Niji cylinder, 20: Piston, 21922: Pair mouth, Ri, 30.3
1: Claw, 33, 34: Hydraulic cylinder, 36: Space.

Claims (2)

[Claims] (1) In an elevating work platform that can be raised and lowered along multiple legs that stand on the seabed, a rod of a predetermined length is suspended from an appropriate height above the water surface of the legs, and the rod is attached to the work platform. It is fitted into a lifting device installed on a ship, the lifting device is moved up and down along the rod, and the hanging position of the rod with respect to the leg is applied while maintaining the relative position of the lifting device and the leg. 1. An elevating work barge, characterized in that the work barge is moved up and down by moving the work barge up and down, and a space is provided in the work barge to receive a lower part of the rod when the rod is moved up and down. (2) A pedestal is locked to the leg and a rod is suspended from the pedestal, and the rod suspension position is changed by changing the locking position of the pedestal to the leg. Liftable work barge.