JPS6328179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an elevating work barge, and in particular,
The time required to raise the work barge from the sea surface to the safe space along the multiple legs that are independent on the seabed, and the time required to lower it from the safe space to the sea surface can be significantly reduced, thereby reducing the preparation work time. The present invention relates to a structure of an elevating type work barge which can shorten the time period and prevent unexpected accidents such as overturning of the work barge.

Multiple sticks (usually 3 to 4 sticks) that stand on the seabed
There are various types of elevating mechanisms used for elevating work platforms that can be raised and lowered along the legs of the
Among these, a pin-and-slot type lifting mechanism is used because it has a simple structure and low manufacturing cost. In this pin-and-slot system, pins are inserted into slots formed at predetermined pitch intervals along the legs, and the work barge is raised and lowered using the pins.

However, with the conventional pin-and-slot type lifting mechanism, the work barge was raised and lowered in an inchworm-like manner by inserting and pulling out the upper and lower pins into each slot. There was a problem that the work was extremely slow and required a great deal of labor 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.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to reduce the time required for lifting and lowering when ascending from the water surface to a safe space and when descending from a safe space to the water surface, compared to the prior art. It is an object of the present invention to provide an elevating work barge that can reduce preparation time and improve safety.

A feature of the present invention is that a rod, which is suspended from a predetermined height above the water surface, is attached to a lifting device attached to a work barge, and the lifting device is moved up and down along the rod. The objective is to raise and lower the work barge by raising and lowering the work barge, thereby achieving the above purpose.

That is, according to the present invention, in an elevating work barge that can be raised and lowered along a plurality of legs that stand on the seabed, a rod of a predetermined length is suspended from a predetermined height above the water surface of the legs. An elevating type work barge is provided, characterized in that the work barge is moved up and down by fitting a rod into an elevating device installed on the work barge and moving the elevating device up and down along the rod. Ru.

1 and 2 are diagrams showing the overall layout of an embodiment of the elevating type work barge according to the present invention, and FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a detailed structure of a lifting device for a work barge, and the present invention will be specifically described below with reference to these drawings.

In FIGS. 1 and 2, a work barge 1 is provided with a plurality of legs (four legs in the illustrated example) 2 that fit vertically through the work barge 1, and a winch installed on the work barge 1 is provided with a plurality of legs (four legs in the illustrated example). By unwinding the wire 4 at 3, each leg 2 is lowered, and these legs can be made independent on the seabed 5.

That is, the work barge 1 is towed with the wire 4 wound in by the winch 3 and each leg 2 raised, and when it arrives at the working area, each leg 2 is lowered and lowered to the seabed 5.
Let it stand on its own and set it to the state shown in Figure 2.

Before carrying out work at sea, the work barge 1 is first moved from the state shown in Figure 2 (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 placed in a safe space or elevated above the water surface. After the work is completed, the work barge 1 is lowered to the water surface 6 by the reverse procedure, and then each leg 2 is raised by the winch 3 to make it movable on the water surface 6. It is necessary to make it possible to tow it to the ground.

In this way, 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 set in.

A structural example of the lifting device 7 will be described below with reference to FIG. 3.

An on-deck girder 8 is fixed around each leg 2 on the work barge 1, and a pair of lifting devices 9 are installed on both sides of the leg 2 within this on-deck girder. The illustrated elevating device 9 is a bear lock jack having a structure of a center hole type jack (a rod that passes through a center hole and can be tightly fitted into a tight fit to strongly lock the rod and extend or retract the rod). A rod 10 is fitted into each lifting device 9 in the vertical direction.

Each rod 10 is connected to a safety space 1 shown by a two-dot chain line from the position of the work barge 1 on the water surface shown by a solid line in FIG.
1, and its upper end is suspended by a pin 12 inserted through the leg 2. Slots 13 for inserting the pins 12 are formed in the leg 2 at predetermined pitch intervals in the vertical direction, and in the illustrated example, the pins 12 are inserted into the slots 13 numbered 2 from the upper end. or,
An upper frame 14 is fitted into the pin 12, and a guide bush 15 is provided between the upper frame and the leg 2 to prevent uneven contact between the leg and the work barge 1. There is.

The legs 2 are fitted with the work barge 1 and the on-deck garter 8 and extend in the vertical direction, and the work barge 1 also has a structure between the legs 2 and the work barge to prevent uneven contact. A guide roller 16 is provided for this purpose.

Elevator 9 composed of the bear lock jack
is supported on a lower pedestal 17, between the lifting device 9 and the on-deck girder 8 and the lower pedestal 1.
Cushions 18, 18 are interposed between the work barge 7 and the work barge 1 for absorbing shock during lifting and lowering operations.

The lifting device (bearlock jack) 9 includes a cylinder 19 fixed in the on-deck girder 8 and a piston 20 fitted in the cylinder. Bear lock 2 that fits with the rod 10
1 and 22 are provided. These bear locks 21, 22 are controllable into either a locked state in which they are tightly fitted to the rod 10 or an unlocked state in which they are movable along the rod 10. The locked state and unlocked state are normally controlled by hydraulic pressure, and there are two types: a pressurized lock type that is in a locked state when hydraulic pressure is applied, and a non-pressure lock type that is in a locked state when hydraulic pressure is released. There are two types of bearing locks 21,
22 can be of any type. Further, hydraulic pressure is applied to the cylinder 19 from either the direction of arrow A or the direction of arrow B, thereby controlling the operation of the piston 20.

The operation of the embodiment structure described above with reference to FIGS. 1 to 3 will be described below.

The work barge 1 is towed into the work area along the water surface 6, the legs 2 are lowered to stand on the seabed 5 (the state shown in Fig. 2), and then the work barge 1 is towed along the water surface 6. is lifted from the water surface 6 into the safe space 11.

First, a pair of rods 10, 1 are moved by the lifting device 9.
0 and extend the tip of each rod upward to a height sufficient to raise the work barge 1 into the safety space 11. This upward movement of rod 10 is
The piston side bear lock 22 is locked, the cylinder side bear lock 21 is unlocked, and by supplying hydraulic pressure from arrow B, the piston 20 is raised, and the rod 1 is raised by that stroke.
Increase 0. Next, the bear lock 21 is locked, the piston-side bear lock 22 is unlocked, and hydraulic pressure is supplied from arrow A to lower only the piston 20. Then, the bear lock 22 is again locked, the bear lock 21 is unlocked, and hydraulic pressure is supplied from arrow B to raise the rod 10 together with the piston 20 by one stroke. By repeating this operation an appropriate number of times, the rod 10 can be extended upward to a predetermined height.

After the pair of rods 10, 10 has been raised, the pin 12 is inserted into the slot 13 at a predetermined height, and the rods 10 are suspended by the legs 2 through the pin.

Next, the work barge 1 is raised to the safe space 11 by raising the lifting device 9 along the rod 10. In this case, since the lifting device 9 is sandwiched between the on-deck girder 8 and the work barge 1, the work barge 1 can be raised by lifting the on-deck girder 8 with the lifting device 9. The lifting of this work barge is carried out in the following steps.

That is, first, the bearing lock 22 on the piston side
Bear lock 21 on the cylinder side is in the locked state.
By setting the bar in the unlocked state and supplying hydraulic pressure from arrow A, the work barge 1 is raised by the stroke amount relative to the rod 10. Then, conversely, the bear lock 21 is locked, the bear lock 22 is unlocked, and hydraulic pressure is supplied from arrow B to raise only the piston 20 by the stroke. Then, by locking the piston-side bear lock 22 again, unlocking the cylinder-side bear lock 21, and supplying hydraulic pressure from arrow A, the work barge 1 is further raised by a stroke. By repeating these operations, the work barge 1 is raised from the water surface 6 to the safe space 11.

When the work barge 1 is lowered from the safety space 11 to the water surface 6 after the work is completed, the lifting equipment 9 is moved to the rod 10.
It suffices to lower it along the same lines as shown in FIG.

According to the embodiment described above with reference to FIGS. 1 to 3, the work barge 1 can be raised and lowered at once between the water surface and the safety space after reaching the work area, and the pin 12 can be moved up and down at once. Since the operation of inserting and pulling out each slot 13 is completely unnecessary, the total lifting time of the work barge can be shortened, and the preparatory work time can be significantly shortened.

Furthermore, in the conventional pin-and-slot method, it was necessary to insert a pin into each of the two upper and lower slots and move the pins up and down alternately to perform the inchworm movement, but in the embodiment described above, Since you only need to insert one pin into a slot at a predetermined height and position it, you can save time and reduce labor.
Work costs can be significantly reduced.

In addition, since the total lifting and lowering time of the work barge 1 can be significantly shortened, the dangerous water-draining condition can be passed through in an extremely short period of time, so that safety can be greatly improved.

As is clear from the above explanation, according to the present invention, it is possible to shorten the time required for the work barge to rise and fall in the work area, thereby improving work efficiency by achieving a significant reduction in preparation time. A lifting type work barge that can be achieved can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall arrangement of an embodiment of the elevating type work barge according to the present invention, and Fig. 2 is a side view showing the state of the elevating type work barge of Fig. 1 before it is lifted (floating state on water surface). 3 are longitudinal cross-sectional views illustrating an elevating device used in the elevating work barge of FIGS. 1 and 2. FIG. 1... Work barge, 2... Legs, 5... Seabed, 6...
...Water surface, 7... Lifting device, 8... On-deck girder, 9... Lifting equipment, 10... Rod, 11...
...safe space, 12...pin, 13...slot,
14... Upper mount, 17... Lower mount, 19...
Cylinder, 20...Piston, 21, 22...Bear lock, A, B...Hydraulic pressure supply direction.

Claims (1)

[Claims] 1. An elevating device that can be raised and lowered along a plurality of legs that stand on the seabed, with rods of a predetermined length suspended from the legs above the water surface, and the rods installed on the work barge. An elevating type work barge, characterized in that the work barge is moved up and down by fitting the elevating device into the rod and moving the elevating device up and down along the rod.