JP2001031363A - Hanging frame for crane ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the sway of a hanging frame body even if a crane ship rocks on the sea under the influence of the wind and waves by installing a synchronizing liquid damper at a hanging body frame. SOLUTION: A synchronizing liquid damper 6 is installed at a hanging frame body 5. The synchronizing liquid damper 6 is formed by filling muddy water 8 in a sloshing container 7. The shape and muddy water depth of the sloshing container 7 are suitably determined to suppress the sway of the hanging frame body 5, that is, to make sloshing of the muddy water 8 resonant with the sway of the hanging frame body 5. In a hanging frame 1 for crane ship of such constitution, since the synchronizing liquid damper 6 is installed at the hanging frame body 5, even if a crane ship 2 is rocked by the wind and waves, the sway of the hanging frame body 5 suspension-supported to a crane wire can be suppressed by the action of the synchronizing liquid damper 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension frame used for a hoist ship equipped with a hoist on a barge.

[0002]

2. Description of the Related Art Hoist ships, also called floating cranes or floating cranes, are equipped with hoists on barges. 4000 in load
At tf, lifting heights exceeding 100 m have appeared, and swiveling types that are convenient for installation work such as caisson are also used for harbor construction.

When a large work or a large material such as a caisson is lifted by such a hoist ship, a crane wire is directly slung on the large work or the like and suspended due to stability during the suspension. Rather, it is often indirectly suspended via a suspension member called a suspension frame.

[0004]

Here, aside from the case where the sea is calm, it is generally unavoidable that the hoist ship itself sways on the sea due to the influence of wind and waves. The hanging frame suspended from the wire also swings in accordance with the swing of the hoist ship, which makes it difficult to hang or remove a caisson or the like from the hanging frame, and if it is forcible, it can be dangerous. There was no problem.

The present invention has been made in consideration of the above-described circumstances, and it is possible to safely and reliably perform a work such as hanging or removing a caisson or the like even when the hoist ship swings due to the influence of wind or waves. It is an object to provide a possible hoist ship suspension frame.

[0006]

In order to achieve the above object, a hoist ship suspension frame according to the present invention is suspended by a crane wire from a hoist mounted on a hoist ship as described in claim 1. It comprises a suspension frame main body and a tuning liquid damper installed in the suspension frame main body, and the tuning liquid damper is configured to suppress the swing of the suspension frame main body.

In the suspension frame for a hoist ship according to the present invention, since the tuning liquid damper is installed on the suspension frame main body, even if the hoist ship swings on the sea due to the influence of wind or waves, it is hung on the crane wire. The swing of the suspended suspension frame body is suppressed by the operation of the tuning liquid damper.

Therefore, a situation in which the caisson or the like cannot be properly slung on the suspension frame due to the swinging motion of the suspension frame is avoided beforehand, and the caisson or the like can be safely and reliably hooked or removed from the suspension frame.

The tuning liquid damper is a TLD (Tuned Liqui
d Damper), a sloshing damper that adjusts the shape of the liquid container and the amount (depth) of liquid in it so that the sloshing resonates with the sway of the suspension frame. I do.

Here, water may be used as the liquid, but it is preferable to use muddy water, especially heavy muddy water instead. In this way, it is possible to increase the mass ratio by using a muddy water having a large specific gravity while securing a large viscous damping, and to effectively absorb the swing of the suspension frame without adding a separate damping member. By using muddy water having a high specific gravity, the amount of liquid for securing the same mass ratio and, consequently, the damper installation space can be reduced.

The muddy water according to the present invention has a considerably different function from the muddy water required when used as a stabilizing liquid for protecting the borehole wall. In other words, for the specific gravity of mud water as a stabilizing liquid, high specific gravity that causes a decrease in the stability of the pore walls, for example, high specific gravity due to silt or fine sand, should be avoided. Therefore, it is desired that the viscosity is as low as possible except for the prevention of liquid leakage.

On the other hand, since the purpose of the mud used in the present invention is to improve the mass ratio and damping of the sloshing damper, the specific gravity and the viscosity of the mud can effectively absorb the swing of the suspension frame. It must be determined from the viewpoint of That is, the specific gravity of the muddy water is preferably as large as possible without impairing the suspension stability, and the mass ratio of the sloshing damper is preferably increased.
Further, it is desirable that the viscosity of the muddy water be determined in consideration of the optimum attenuation value.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a suspension frame for a hoist ship according to the present invention. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

FIG. 1A is an overall view showing the use of the hoist ship hanging frame according to this embodiment, and FIG. 1B is a side view of the hoist ship hanging frame. As you can see in the figure,
The hoisting ship suspension frame 1 of the present embodiment includes a suspension frame main body 5 suspended on a crane wire 4 from a hoist 3 mounted on a hoisting boat 2 and a tuned liquid damper 6 installed on the suspension frame main body. Become.

The tuned liquid damper 6 is filled with muddy water 8 in a sloshing container 7 as can be clearly seen from FIG. 2B, and the shape of the sloshing container and the depth of the muddy water are suppressed to suppress the swing of the suspension frame body 5. That is, the sloshing of the muddy water 8 may be appropriately determined so as to resonate with the swing of the suspension frame body 5. Incidentally, it can be considered that the natural period of the swing of the suspension frame main body 5 substantially depends on the length of the suspension from the crane wire 4 like the period of the pendulum.

The sloshing container 7 may be made of any shape and material as long as it can be sloshed without the muddy water 8 overflowing to the outside. It is preferable to use a material having a high density, for example, FRP. In addition, crane wire 4
It is preferable that the suspension frame body 5 is formed in a cylindrical shape so as to suppress the swing even if the suspension frame body 5 suspended in any direction swings.

The specific gravity and the viscosity of the muddy water 8 should be determined from the viewpoint of how efficiently the swing of the suspension frame body 5 can be absorbed, and the specific gravity is in a range that does not impair the suspension stability. It is preferable to increase the mass ratio of the sloshing damper to the suspension frame main body 5 as much as possible. Further, it is desirable to determine the viscosity as large as possible within a range where the sloshing response of the muddy water 8 as the mass does not become so small, that is, to determine the viscosity in consideration of the optimum attenuation value.

As a method of increasing the specific gravity of muddy water, it is conceivable to use a weighting material such as kaolin clay, (fine) calcium carbonate, zeolite, magnesium carbonate, barium sulfate (natural product is called barite). .
These weighting materials can increase the specific gravity only without increasing the viscosity, and thus can be designed separately from damping of the damper.

As a method of increasing the viscosity of the muddy water, it is conceivable to increase the amount of bentonite or CMC added. However, bentonite increases not only the viscosity but also the specific gravity, so it is necessary to consider the type and amount of the weighting material. On the other hand, the CMC increases the viscosity only, so that design is easy. In particular, high viscosity CMC is suitable.

The suspension frame body 5 can be made of, for example, a steel frame material.

When using the suspension frame 1 for a hoist ship according to the present embodiment, first, the crane wire 4 of the hoist ship 2 is used.
The hoist 3 of the hoist ship 2 was appropriately operated such that the suspension frame main body 5 suspended above the caisson separately manufactured at the wharf, for example, was then moved up and down as necessary. Thereafter, the lower end of the auxiliary wire 9 suspended from the suspension frame body is hooked on a caisson.

At this time, since the tuning liquid damper 6 is installed on the suspension frame main body 5, even if the crane ship 2 rocks on the sea due to the influence of wind and waves, the crane wires 4
The swinging of the suspension frame main body 5 suspended in the suspension frame 5 is suppressed by the operation of the tuning liquid damper 6, and the auxiliary wire 9 of the suspension frame main body 5 can be safely and securely slung on the caisson.

Next, the hoist 3 is appropriately operated while the caisson is slung, and then the caisson 10 is moved to a predetermined position, for example, a breakwater, a large bridge, an offshore storage base, etc., as shown in FIG. Hang it at the construction point, and after landing,
Remove the auxiliary wire 9. In this case as well, the swing of the suspension frame main body 5 is suppressed by the operation of the tuning liquid damper 6 as described above, so that the auxiliary wire 9 can be safely and securely removed from the caisson.

As described above, according to the suspension frame 1 for a hoist ship according to the present embodiment, since the tuning liquid damper 6 is installed on the suspension frame main body 5, even if the hoist ship 2 swings due to wind or waves. In addition, the swing of the suspension frame body 5 suspended on the crane wire 4 can be suppressed by the operation of the tuning liquid damper 6.

Therefore, the caisson and the like can be safely and reliably hung and removed from the hanging frame main body 5, and the situation where the hanging frame swings and the caisson and the like cannot be properly slung on the hanging frame as in the prior art can be prevented. To be avoided. In addition, since the work can be continued even when the waves are high, the entire construction period can be shortened.

In this embodiment, the lifting frame for a hoist ship of the present invention is applied to the lifting and hanging of caissons. However, the present invention is not limited to such applications, and the lifting of other large materials and large workpieces is also possible. Needless to say, the present invention can also be applied to hanging.

[0027]

As described above, according to the hoisting ship frame of the present invention according to the first aspect, even if the hoisting ship is swung by wind or waves, the hanging frame main body hung by the crane wire. Can be suppressed by the operation of the tuning liquid damper. Therefore, the caisson or the like can be safely and reliably hung or removed from the hanging frame main body, and a situation in which the hanging frame swings and the caisson or the like cannot be slinged on the hanging frame as in the related art can be avoided. .

[0028]

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a suspension frame for a hoist ship according to the present embodiment, wherein (a) is an overall view showing a use state, and (b) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suspension frame for hoist ship 2 Hoist ship 3 Hoist 4 Crane wire 5 Suspension frame body 6 Synchronized liquid damper

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yozo Goto 4-640 Shimoseito, Kiyose-shi, Tokyo F-term in Obayashi Corporation Technical Research Institute Co., Ltd. 3F004 EA26 KA01 LC08 3F205 AA10 BA01

Claims (1)

[Claims] 1. A suspension frame body suspended from a crane wire from a hoist mounted on a hoist ship, and a tuned liquid damper installed on the suspension frame body, wherein the tuned liquid damper is attached to the suspension frame body. A suspension frame for a hoist ship, wherein the suspension frame is configured to suppress shaking of the ship.