JP2939671B2 - Tower crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane used on a steel tower when a steel tower such as a power transmission tower is constructed.

[0001]

2. Description of the Related Art When constructing a transmission line on a steel tower, it is necessary to transport many heavy objects onto the steel tower. Conventionally, a pulley is hung on an arm at the upper part of a tower, and a wire rope hung on the pulley is operated with a winch on the ground to lift heavy objects onto the tower.

[0002]

In the above-mentioned conventional method, there is a problem that the material cannot be lifted or lowered at an arbitrary position because the position of the pulley is fixed. In particular, the task of taking material inside the pulley position was extremely difficult and dangerous. Further, with a commercially available crane, the weight of the fuselage is too large to be installed without reinforcing the tower, and it is not easy to transport the tower onto the tower. Therefore, an object of the present invention is to provide a simple and lightweight tower crane capable of lifting or hanging a material at an arbitrary position.

[0003]

According to the present invention, in order to solve the above-mentioned problems, a turning device 1 is mounted on a second arm A2 from the top of a tower, and a base end of a boom 4 is attached to the turning device 1. And a turning device 1 is provided on the top arm A1 of the tower.
The pulleys 7 and 8 are attached to the top of the tower, an undulating winch 9 is attached to an arbitrary position on the tower, and one end of an undulating wire rope 10 is locked to the winch 9. , 8 connected directly or indirectly to the boom 4, the boom 4 is swung by the swivel device 1, and the boom 4 is raised and lowered by winding up the wire rope 10 by the hoisting winch 9. did.

[0004]

The tower crane according to the present invention is used by being attached to two arms A1, A2 at the top of a steel tower. Material M for boom 4
, The material M is brought to an arbitrary position, and the hoisting winch 5 attached to the rotating device 1 raises and lowers the suspending wire 6 to load and unload the material M. Do the work. Raising and lowering of the boom is performed by operating the wire rope 10 with the winch 9 for raising and lowering.
Since a part of the steel tower is used as a component of the crane, the weight of the entire tower is reduced, and the load of the two arms A1, A2
Therefore, the influence on the steel tower is small, and the size of the swirl part and the like can be reduced.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The figure is a schematic perspective view of a tower crane.

[0006] A turning device 1 is mounted on the second arm A2 from the top of the tower. The swivel device 1 includes a arm A2
It has a mounting base 2 fixed thereon and a swivel base 3 rotatably supported on the base 2. The turning base 3 is rotated by an attached motor.

A base end of a boom 4 is pivotally supported on the swivel base 3 so that the boom 4 can be raised and lowered, and a lifting winch 5 is mounted on the base. One end of a lifting wire 6 hanging from the tip of the boom 4 is locked to the lifting winch 5. The material M is lifted and lowered by winding or unwinding the wire 6 with the lifting winch 5. ing.

[0008] A turning device 1 is attached to the upper arm A1 of the tower.
And pulleys 7, 8 are mounted above. An undulation winch 9 is mounted on the arm A2, and one end of an undulation wire rope 10 is locked to the winch 9. This wire rope 10 has pulleys 7, 8
, And the other end is locked to the pulley 7. The boom 4 is raised by winding up the wire rope 10 with the hoisting winch 9.

The tower crane according to the present invention is provided with
It is used by attaching it to two arms A1, A2. The material M is hung on the boom 4 via the wire 6 and the boom 4 is turned by the turning device 1 to bring the material M to an arbitrary position. Then, the hoisting winch 5 attached to the turning device 1 raises and lowers the suspending wire 6 to load and unload the material M. The ups and downs of the boom 4 are performed by operating the wire rope 10 with the up and down winch 9. Since part of the tower is used as a component of the crane, the entire tower is lightweight, and there is no need to reinforce the tower for installation. Boom 4
Turns and undulates, so the lower arm does not get in the way,
The material M can be moved over a wide range. Further, since the load is distributed to the two arms A1 and A2, the load on the turning portion is reduced, and the turning portion can be downsized. If an angle is formed between the hoisting wire rope 10 and the boom 4 during the turning of the boom 4, a load is applied to the rope 10 as a horizontal component force. Will be supported and minimized.

[0010]

As described above, according to the present invention, the turning device 1 is mounted on the second arm A2 from the top of the tower, and the base end of the boom 4 is supported on the turning device 1 so that On the upper arm A1, the pulleys 7,
8, a hoisting winch 9 is installed at an arbitrary position on the tower, and one end of a hoisting wire rope 10 is locked to the winch 9, and the wire rope 10 is directly or indirectly connected via pulleys 7, 8. Because the tower crane was configured to be connected to the boom 4 and swiveled by the swivel device 1 and to raise and lower the boom 4 by hoisting the wire rope 10 by the hoisting winch 9, the material M was placed at an arbitrary position. A simple and lightweight tower crane that can be lifted or lowered can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a tower crane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Swivel device 4 Boom 6 Hanging wire 7 Pulley 8 Pulley 9 Winch for hoisting 10 Wire rope A1 Arm A2 Arm M Material

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kyushu Watanabe, Inventor 2-182 Watanabe-dori, Chuo-ku, Fukuoka City Inside Kyushu Electric Construction Co., Ltd. (72) Inventor Masaru Nonohara 6-5 Minamishinagawa, Shinagawa-ku, Tokyo No. 19 Sanwa Tekki Co., Ltd. (72) Inventor Hiroaki Ueno 6-5-19 Minamishinagawa, Shinagawa-ku, Tokyo (72) Inventor Toshiaki Kodama 6-5 Minamishinagawa, Shinagawa-ku, Tokyo No. 19 Sanwa Tekki Co., Ltd. (72) Inventor Kiyohan Ibuka 1-1-1, Watanabe-dori, Chuo-ku, Fukuoka City Sanwa Tekki Co., Ltd. Fukuoka Sales Office (56) References JP-A-2-272168 (JP) , A) JP-A-62-222993 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B66C 23/00-23/94

Claims (1)

(57) [Claims] 1. A swivel device is mounted on a second arm bar from the top of a tower, and a base end of a boom is supported on the swivel device. Attach a pulley, attach a hoisting winch at any position on the tower, lock one end of an hoisting wire rope to this winch, and connect the wire rope to the boom via the pulley, and turn A tower crane characterized in that the boom is turned by an apparatus and the boom is raised and lowered by hoisting a wire rope by a hoisting winch.