JPS59227689A - Method of lifting boom of crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for mounting a boom on a crane.

[Background of the invention]

The boom 1 of the horizontal crane shown in FIG. 1 has a weight ranging from about 80 tons to about 1001 tons, and the center of gravity of the boom 1 is located 20 to 25 trL on the sea side from the quay.

Moreover, the installation height of the boom 1 is as high as 30 to 35 m. When installing the boom 1 on a crane body assembled on a quay, conventionally, the boom 1 is lifted using a floating crane floating on the sea or a large truck crane with a long reach from the quay to the sea side. Installation work was being carried out.

However, if a floating crane or large truck crane cannot be procured, installation work cannot be carried out.
Even if it could be procured, it had the drawback of high installation costs.

[Purpose of the invention]

The object of the present invention is to provide a method for hoisting a boom without using any other crane.

[Summary of the invention]

In the crane, the mast on the crane is held tilted, a boom placed below the mast is connected to a loaf hanging from the top of the mast, and the boom is wound by winding the rope with a rope winding device. A crane boom hoisting method is characterized in that the boom is lifted in the installation height direction, and the boom can be lifted in the installation height direction using the members themselves that constitute the crane.

[Embodiments of the invention]

The horizontal crane installed on quay A has the structure shown in Figure 1. That is, the traveling device 1 is placed on the rail on the quay A.
The direct expansion 3 running by 8 horizontally holds the girder 2 at a high place. A mast 4 is attached to the direct expansion 3 on the sea B side by a shaft 16 so as to be tiltable. The upper part of the other direct expansion 3 and the lower end of the backstay 5 are connected by a shaft 17, and the upper end of the backstay 5 is connected to the upper part of the mast 4 by a shaft 19 so that the mast 4 is held vertically.

A boom 1 is connected to the sea B side end of the girder 2 by a shaft 14 so as to freely rotate up and down. This boom l has each link 6a, 6
The lower end of the tension link 6, which is constructed by rotatably attaching parts b and 6c to the shaft 13, is attached to the shaft 12, and the upper end of the tension link 6 is connected to the upper part of the mast 4 by the shaft 11. In this way, the boom l is installed horizontally from the mast 4 by the tension link 6.

A machine room 7 is installed on the girder 2 with consideration given to not interfering with the running of the trolley 15 that runs on the girder 2 and the boom l. In this machine room 7, a levitation rope winding device 8 is installed. The undulating rope 9 let out from the rope winding device 8 is passed to the boom 1 via a rope sheep attached to the upper part of the mast 4. Therefore, when the undulating rope 9 is wound up with the rope winding device 8,
The boom 1 stands up and rotates around the shaft 14 while the tensilon link 6 is bent at the shaft 13 portion. This boom raising operation is necessary to prevent the mast of the cargo ship from hitting the boom 1 when the cargo ship berths or leaves the berth, or when the crane travels along the cargo ship.

Cargo handling by the crane between the cargo ship and the quay is performed while the trolley 15 is running with the boom l horizontal.

, 3.

The structure of such a lane is similar to a conventional horizontal crane.

The boom of this crane is assembled to the crane as shown in Figure 2.

That is, a rope hanging metal fitting 21 is installed at the lower part of the backstay 5, a rope sheave n is installed at the upper part of the direct expansion 3, and a mop sheave Z is installed on the quay wall Al. Next, one end of the rope U is connected to the rope hook 21, and the rope is led midway through each rope sheep 22°n to the quay wall A surface. The other end of the rope is wound around a winch 5, which is a rope winding device installed on the quay A. next,
The tension link 6 is attached to the mast 4 by the shaft 11 and bent as shown in Fig. 2, and both ends of the tension link 6 are connected with a rope part so that this bent state is maintained. The undulating rope 9 taken out from the rope winding device 8 is suspended from the top of the mast 4 via the rope sheep of the mast 4 and prepared to an angle of 4 degrees or more, and then the straight expansion 3 and the loose rope 4 are made by the shaft 17.
・With the mast 5 not connected, operate the winch 5 in the direction that loosens the rope, and connect the mast 4 shown by the solid line in Figure 2.
Tilt it towards the sea B side and hold it. Next, the hoisting rope 9 is let out from the hoisting rope winding device 8, and is lowered from the mast 4 to the sea surface via a rope sheep. A purge ship n loaded with boom 1 is kept waiting on the sea in advance. The boom l is connected to the undulating rope 9 that has been lowered to the sea surface via an auxiliary rope section or the like. Next, by winding up the hoisting rope 9 with the hoisting rope winding device 8, the boom 1 is lifted upward from the purge vessel n, and the boom l
the installation height.

The height of the boom l is adjusted by operating the hoisting rope 9 with the hoisting rope winding device 8, and the horizontal position of the boom l is adjusted by operating the rope rope with the winch 5 to hoist the mast 4 around the shaft 16. Adjust accordingly. By these adjustments, the left end of the boom 1 and the right end of the girder 2 are aligned and connected by the shaft 14. Furthermore, remove the rope part from the tension link 6 and attach the lower end of this tension link 6 to the boom 1 on the shaft 1.
Connect with 2. Thereafter, the mast 4 is rotated upward about the shaft 16 by winding the rope neatly with the winch 5 until it stands vertically. During this time, the hoisting rope 9 is let out from the hoisting rope winding device 8 so that the boom l is always kept almost horizontal. In this way, the backstay 5 and tension link 6 are made oblique and the mast 4 is made vertical, as shown by the chain line in FIG. Next, the lower end of the backstay 5 is connected to the direct expansion 3 by the shaft 17. Then, the undulating rope 9 is connected to the boom l. Thereafter, the winch δ, the rope U, each rope sheep 23, and the rope hanger are assembled into a horizontal crane as shown in FIG. 1 by removing the metal fittings 21 and the auxiliary ropes.

In this embodiment, the levitation rope winding device 8 is used, but if the levitation rope winding device 8 is not yet assembled and cannot be used, it may be installed on the winch girder 2 or on the quay A. It may be used in place of the undulating rope winding device 8. Furthermore, one winch 6 may be attached to the crane side of the girder 2 or the like.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to achieve the effect of hoisting the boom of a crane without using another crane.

[Brief explanation of drawings]

Figure 1 is an overall view of the assembled bridge crane, and Figure 2 is an overall view of the horizontal crane during installation of the boom shown in Figure 1 using the method of the present invention. 1...Boom, 2...Girder-13.
・Direct expansion, 4...Mast, 5. Old...Backstay, 6...Tension link, 8...
・Luffing rope winding device, 9...Luffing rope,
11. 12. 13. 14. 16.17.19・
...axis, 20.22.23...rope sheep,
21...The curved rope hanger is a metal fitting, 夙...rope, 5
・・・・・・Winch, ga... 1st area L1 drawing

Claims (1)

[Claims] ■ In a crane equipped with a girder supported by high legs and a mast protruding above the girder,
The M mast on the crane is held tilted, a boom placed below the mast is connected to a rope hanging from the top of the mast, and the rope is wound up with a rope winding device to raise the boom to the installation height. A crane boom hoisting method characterized by lifting in the horizontal direction.