JPH082175Y2 - Long-term holding device for lifting device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a jack for a working frame equipped with a grasping means for grasping and releasing a leg on a reaction force girder erected on a pedestal of a marine workbench, for example. The present invention relates to a long-term holding device in an elevating device that is hung via a hoisting frame provided with the grasping means on the lower surface of the reaction force girder.

[Prior Art] Various lifting devices for offshore work pontoons are known. For example, in Japanese Patent Application Laid-Open No. 62-291313 filed by the present applicant, the legs are clamped and deformed to hold and hold them. ,And,
An elevating device including an annular grasping device for releasing a leg, a locking device for preventing a decrease in the grasping force of the grasping device, and a load device for measuring a load applied to the leg is shown.

Further, as a holding means, a so-called tooth having a tooth portion formed on a leg.
In the TOOTH type lifting device, the gantry is held by a working frame that moves up and down by jacks.

[Problems to be Solved by the Invention] In the former device, the pedestal may sink due to a decrease in gripping force due to rust on the legs.

Also in the latter device, the pedestal may sink due to a hydraulic leak of the jack.

An object of the present invention is to provide a long-term holding device in a lifting device that can hold a pedestal for a long time.

[Means for Solving the Problems] According to the present invention, a working frame having grasping means for grasping and releasing a leg is suspended from a reaction girder erected on a stand via a jack, and In a lifting device provided with a hoarding frame having the grasping means on the lower surface of the reaction force girder, a suspension beam is set at the top end of the leg,
The suspension beam and the holding frame are connected by a suspension member.

It is preferable that the above-mentioned hanging member is formed of a hanging rod or a hanging wire.

[Operation] In the long-term holding device in the lifting device configured as described above, the weight of the pedestal is directly mechanically applied to the top end of the leg through the pillar, the reaction force girder, the holding frame, the hanging member, and the hanging beam. To be done. Therefore, the pedestal can be reliably held on the legs for a long period of time without being affected by the hydraulic leak of the jack or the rust of the legs.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Four columns 4 are attached to the bracket 2 provided on the upper surface of the gantry 1 of the offshore work boat by pin joints 3. A square reaction force girder 7 is attached to the upper end of the column 11 with nuts 5 and 6. The reaction force digit 7
A holding frame 8 is attached to the lower surface of the holding frame 8 by a tie rod (not shown), and a working frame 9 is suspended below the reaction frame 7 by two hydraulic jacks 10.

The leg 15 extends downward through the reaction force girder 7, the holding frame 8 and the working frame 9, and the both frames 8 and 9 grasp and release the leg 15 (not shown), for example, the above-mentioned Japanese Patent Laid-Open No. 62- A grasping device as shown in Japanese Patent No. 291313 is provided respectively, and these members 2 to 10 constitute an elevating device A for the leg 15.

On the other hand, a cross-shaped suspension beam 11 is set on the top end of the leg 15 by means not shown. Then, at each end of the suspension beam 11, four suspension rods 14 which are long members are suspended by washers 12 and nuts 13.
Extend downward through the reaction force beam 7 and the holding frame 8, and the lower end is fixed to the lower surface of the holding frame 8 by a washer 12 and a nut 13.
1 to 14 form a long-term holding device B. The long member is not limited to the hanging rod 14,
Hanging wires may be used.

 Next, a mode of long-term holding will be described.

First, the leg 15 is descended to the bottom of the sea from a floating work table boat floating on the sea. This lowering of the legs 15 is performed by grasping the legs 15 with the holding frame 8 and moving the legs 15 from the working frame 9.
Is released and the hydraulic jack 10 is contracted. Next, the leg is grasped by the working frame 9, the leg 15 is released from the holding frame 8, the hydraulic jack 10 is extended, and the leg 15 is lowered by the stroke. When these operations are repeated and the legs 15 continue to operate even after reaching the seabed, the reaction force from the seabed on the legs 15 causes the marine work platform ship to rise above the sea surface.

Then, when the ocean work pontoon has risen to a predetermined level above the sea surface, work for holding the ocean work pontoon on the legs 15 for a long time is performed.

First, the suspension beam 11 is set on the top of the leg 15.
Next, the suspension rod 14 is lowered to penetrate the reaction force beam 7 and the holding frame 8, both ends of the rod 14 are tightened with washers 12 and nuts 13, and the suspension beam 11 and the holding frame 8 are connected by the rod 14.

In this state, the weight of the pedestal 1 is such that the weight of the pedestal 1 is increased by the pin joint 3, the column 4, the nuts 6 and 13, the reaction force girder 7, the holding frame 8, the nut 13, the suspension rod 14, the nut 13 and the suspension beam 11 and the leg 15. Is loaded on the crown of. Since it is held mechanically like this,
The pedestal 1 can be reliably held on the legs 15 for a long period of time without being affected by a hydraulic leak or rust on the legs 15.

Further, when it is necessary to raise / lower the gantry 1 during long-term holding, the lifting rod 14 can be removed and the raising / lowering device A can immediately raise / lower.

[Advantages of the Invention] Since the present invention is configured as described above,
Since the pedestal is mechanically supported directly on the top of the leg, the pedestal can be reliably held on the leg for a long period of time.

[Brief description of drawings]

1 and 2 are a side view and a top view showing an embodiment of the present invention. A ... Lifting device, B ... Long-term holding device 1 ... Stand, 4 ... Strut, 7 ... Reaction force girder, 8 ... Holding frame, 9 ... Working frame, 11 ...
Hanging beam, 14 ... Hanging rod, 15 ... Leg

Claims (1)

[Scope of utility model registration request] 1. A working frame having grasping means for grasping and releasing legs on a reaction force girder erected on a frame is hung via a jack, and the grasping means is provided on the lower surface of the reaction girder. A long-term holding device in an elevating device, comprising a hoisting frame provided with the hoisting frame, wherein a suspension beam is set on a top end of the leg, and the suspension beam and the holding frame are connected by a suspension member.