JP2000247578A - Simply handling wire tension machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply handling wire tension device which can give a necessary tension force to a winding-up wire rope wound on the winding-up winch of a tower crain. SOLUTION: This tension machine is provided to a base frame 2 installed to the half mast of a tower crain, and it gives a brake force on the flange peripheral surface 3A of a tension machine drum 3 in order to wind a winding-up wire rope R1 and the like from the front end of a jib by a caliper brake device 5, As a result, a tension force is given to the winding-up wire rope R1 and the like from the tension machine drum 3, and the winding-up wire rope R1 and the like can be wound to the winding-up winch drum set to the half mast at a necessary tension force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple wire tensioner for winding a wire rope of a tower crane around a hoisting winch drum, and more particularly to a tower crane in which a hoisting wire rope is wound during use. The present invention relates to a simple wire tensioning machine suitable for being wound around a hoisting winch drum of a tower crane while giving tension to a hoisting wire rope again.

[0002]

2. Description of the Related Art A tower crane used for construction work of a building or the like sometimes requires a lifting height of 300 m or more. Therefore, a hoisting winch drum is wound with ten or more layers of hoisting wire rope. Will be. When assembling the tower crane on the construction site, the hoisting wire rope is wound around the hoisting winch drum. The upper wire rope of the drum enters the lower layer, which causes the winding wire rope to wind up and lose its shape.

[0003] At present, a method of generating initial tension on a hoisting wire rope is a method in which a jib of a tower crane is turned down, and a tension generator and a new wire wound on a wooden drum are provided on an extension of the jib. This is a method in which a rope is placed, a wire rope unreeled from a wooden drum is wound around a tension generating device, and then sent to a hoisting winch drum.

[0004]

However, since the tower crane climbs sequentially as the building gets higher, if the hoisting wire rope on the hoisting winch drum becomes turbulent after climbing to some extent, the tower crane will not work. It is not possible to bring the jib of the tower crane down as described above due to the entrainment of the upper wire rope. Therefore, in this case, there is a problem that it is impossible to rewind the winding wire rope while applying tension by the above-described conventional method.

[0005] In addition, when the hoisting wire rope is wound around the hoisting winch at the time of assembling the tower crane by the conventional method, the following problems have occurred. (1) In the case of a tower crane, the distance between the tension device and the hoisting winch is about 60 m, and the elongation of the hoisting wire rope is increased, so that the applied tension is not reliably transmitted to the hoisting winch drum. As a result, the winding tension of the hoisting wire rope around the hoisting winch drum is reduced, which causes loosening later. (2) Since the weight of the tensioning device is about 5 tons and the weight of the ballast is about 6 tons, the overall weight is heavy and handling is very difficult. (3) When the hoisting wire rope is wound, an area of about 5 m ² is required to install the tensioning device on the ground on the extension of the jib.

[0006] It is therefore an object of the present invention to provide a simple wire tensioner which can solve the above-mentioned problems in the prior art.

[0007]

According to the present invention, in order to solve the above-mentioned problems, the hoisting wire rope is mounted on the hoisting winch drum at the time of assembling the tower crane or at the time of random winding of the hoisting wire rope during use. What is claimed is: 1. A simple wire tensioner for tensioning and winding, comprising: a base frame attached to a half mast of the tower crane; a tensioner drum provided on the base frame for winding a hoisting wire rope; A simple wire tensioning machine having a brake device for applying a brake to the rotation of the drum, wherein a tensioned wire rope is supplied from the tensioning machine drum to a hoisting winch drum of a tower crane; Is done.

If the hoisting wire rope supplied from the tip of the jib is wound around the tensioner drum, for example, twice, and then sent to the hoisting winch drum, the hoisting is performed by the braking force applied to the tensioner drum by the brake device. The required tension is applied to the wire rope. As a result, the hoisting winch drum can be wound tightly around the hoisting winch drum while applying good tension to the hoisting winch drum of the tower crane via this simple wire tensioning machine.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an elevational view showing an example of an embodiment of a simple wire tensioner according to the present invention, and FIG. 2 is a plan view thereof. Referring to FIGS. 1 and 2, in the present embodiment,
The wire tensioning machines 1 and 1 ′ having exactly the same configuration are formed on a single common base frame so that tension can be simultaneously applied to a pair of two hoisting wire ropes. I have. Therefore, first, the configuration of one wire tensioning machine 1 will be described.

The wire tensioning machine 1 applies a required tension to the hoisting wire rope when the hoisting wire rope from the jib tip of the tower crane is tensioned and wound around the hoisting winch drum of the tower crane. And a base frame 2 commonly used with a wire tensioner 1 'attached to a half mast of a tower crane described later. On the base frame 2, a tensioner drum 3 for winding a hoisting wire rope supplied from a jib tip of a tower crane (not shown),
It is rotatably provided on a column 4 erected on the base frame 2.

A hydraulic caliber brake device 5 is provided on the base frame 2 to apply a brake to the rotation of the tensioner drum 3. The caliber brake device 5 includes a frame body 51 fixed on the base frame 2 and a hydraulic cylinder 52 and a friction member 53 provided on the frame body 51. The friction member 53 is attached to the flange peripheral surface 3A of the tensioning machine drum 3 by the hydraulic cylinder 52. When pressed, a required braking force is applied to the tension machine drum 3.

Reference numeral 6 denotes a wire holding device. The hoisting wire rope supplied from the jib tip of the tower crane is once held by the wire holding device 6 and then sent to the tensioner drum 3. In this embodiment, the hoisting wire rope is wound twice around the tensioning machine drum 3 in order to prevent slippage between the hoisting wire rope and the tensioning machine drum 3. It can be determined appropriately.

To feed the hoisting wire rope R1 from the tensioner drum 3 to a hoisting winch drum (not shown), a sheave 8 rotatably supported by an A frame 7 is provided on the base frame 2. Tension machine drum 3
Is lifted upward through the sheave 8 and sent to the hoisting winch drum of the tower crane through a path described later. In addition, 9 is a weight box and 10 is a handrail.

In the above, one wire tensioning machine 1 provided on the base frame 2 has been described, but the other wire tensioning machine 1 ′ is configured on the base frame 2 in exactly the same manner. The wire tensioners 1, 1 'can apply tension to a pair of hoisting wire ropes sent through the jib of the tower crane by the wire tensioners 1, 1'. I have.

The contents described above are the basics of this machine.
It can be applied mainly when assembling a tower crane. However, this machine can be used not only when assembling, but also when the hoisting wire becomes turbulent during use of the tower crane.

Next, referring to FIG. 3, the wire tensioning machines 1 and 1 'shown in FIGS. 1 and 2 are installed on a half mast of a tower crane to form a random winding of a hoisting wire rope. A method for correction will be described. In FIG. 3, 20 is a tower crane, 21 is a revolving superstructure, 22 is a half mast, 23 is a jib, 24 is a hoisting winch drum, 26 is a guy support assembled on the revolving superstructure 21, and 27 is a guy support 26 This is a sheave provided at the upper end.

In FIG. 3, only one sheave 27 and one winding winch drum 24 are visible.
7 and the hoisting winch drum 24 are also provided in two sets corresponding to the wire tensioning machines 1, 1 '.

First, the common base frame 2 of the wire tensioning machines 1 and 1 'grounded by the revolving unit 21 is attached to the half mast 22. Next, the jib 23 is turned down close to the limit, and the A frames 7 of the wire tensioning machines 1 and 1 'are raised vertically and fixed with set pins (not shown). In order to guide the hoisting wire ropes R1 and R2 through the jib 23, the jib 2
A plurality of single-pipe pipes 28 serving as wire receivers are disposed at appropriate locations (for example, at three locations) in 3. In FIG. 3, only one of the plurality of single pipes 28 is visible.

The hook block 29 is lowered to the working floor, and the hoisting wire ropes R1, R
The winding wire ropes R1 and R2 are clipped at the tip 23A of the jib 23, leaving about 10 turns of the jib 23.

At this time, the winding wire ropes R1, R2
Is passed from a tip 23A of the jib 23 onto a single pipe 28 attached to the jib 23, and from the root of the jib 23 toward the wire tensioning machine. Hoisting wire rope R1, R
2 passes through the corresponding wire tensioner 1, 1 '(see FIG. 2)
It is wound around the corresponding winch drum 24 through the corresponding sheave 27.

At this time, the winding wire ropes R1, R2
, And the wire ropes R1 and R2 are wound, for example, twice around the corresponding tension machine drum 3, and the wire clip is removed.

As a result, the hoisting wire ropes R1, R2 from the tip 23A of the jib 23 are connected to the corresponding tensioner drum 3
Is wound up twice, passed through the corresponding sheave 8 of the A frame 7, pulled up, pulled down again through the sheave 27 of the guy support 26, and taken up by a predetermined hoisting winch drum 24. A traveling route is formed.

Here, in each of the wire tensioners 1 and 1 ′, the caliber brake device 5 is operated, and the hydraulic cylinder 52 is moved by the frame main body 51 to the tensioner drum 3.
When the hoisting winch drum 24 is rotated in the hoisting direction while applying a brake to the rotation of the tensioning machine drum 3, the hoisting wire tensioned by the wire tensioning machine 1, 1 'is applied. The ropes R1 and R2 are wound around the corresponding winch drum 24.

Since the wire tensioning machines 1 and 1 'and the hoisting winch drum 24 are installed in the vicinity of the revolving superstructure 21, the distance between them is short. Therefore, the elongation of the hoisting wire ropes R1 and R2 between them is small. Less, wire tensioner 1,
The hoisting wire ropes R1, R2 are wound around the corresponding hoisting winch drum 24 with the tension applied to the hoisting wire ropes R1, R2 by 1 '. As a result, the hoisting wire ropes R1 and R2 can be wound around the corresponding hoisting winch drum 24 without causing irregular winding or shape loss.

Since the wire tensioners 1, 1 'are thus provided in close proximity to the hoisting winch drum 24, the hoisting wire ropes R1, R' can extend over 60 m as in the prior art.
Compared to applying a tension to R2, the device becomes extremely small and lightweight, no ballast is required, and its handling is simplified. Since the wire tensioners 1, 1 'are set on the half mast 22, there is no need to secure a place on the extension of the jib 23 and install the tensioner, which is very convenient. For this reason, even if the hoisting wire rope becomes turbulent during operation, the turbulent winding can be easily corrected at any time by setting the device on the half mast 22. . In this case, since the wire tensioning machines 1 and 1 'and the corresponding hoisting winch drum 24 are close in distance, the wire tensioning machines 1 and 1' use the hoisting wire ropes R1 and R2.
Is transmitted to the corresponding hoisting winch drum 24 satisfactorily, and the hoisting wire ropes R1 and R2 can be wound into the hoisting winch drum 24 extremely well.

[0027]

According to the present invention, as described above, the wire tensioning machine can be provided in close proximity to the hoisting winch drum, so that the distance therebetween is short, and therefore, the wire tensioning machine and the hoisting winch are reduced. The elongation of the hoisting wire rope with the drum is small, and the hoisting wire rope can be wound around the hoisting winch drum with the tension applied to the hoisting wire rope by the wire tensioner. Therefore, the hoisting wire rope can be wound around the hoisting winch drum without any irregular winding or deformation.

Further, as compared with the conventional method in which the tension is applied to the hoisting wire rope over 60 m or more, the apparatus becomes extremely small and light, the ballast becomes unnecessary, and the handling becomes simple. And since the wire tensioner is set on the half mast, there is no need to secure a place on the extension of the jib and install the tensioner, which is very convenient. For this reason, even if the hoisting wire rope becomes turbulent during the operation, the turbulent winding can be easily corrected at any time by setting the apparatus on the half mast. In this case, since the wire tensioning machine and the hoisting winch drum are short in distance, the tension applied to the hoisting winch drum by the wire tensioning machine is also transmitted well to the hoisting winch drum, and The winding of the hoisting wire rope can be performed extremely well.

[Brief description of the drawings]

FIG. 1 is an elevational view showing an example of an embodiment of a simplified wire tensioner according to the present invention.

FIG. 2 is a plan view of the wire tensioning machine shown in FIG.

FIG. 3 is an explanatory diagram for describing a method for correcting irregular winding of a hoisting wire rope by using the wire tensioning machine shown in FIGS. 1 and 2;

[Explanation of symbols]

 1, 1 'wire tensioner 2 base frame 3 tensioner drum 5 caliber brake device 20 tower crane 22 half mast 23 jib 24 hoisting winch drum R1, R2 hoisting wire rope

Claims (1)

[Claims] 1. A simple wire tensioning machine for tensioning and winding a hoisting wire rope into a hoisting winch drum when a hoisting wire rope is disturbed during assembly or use of a tower crane, A base frame attached to the half mast of the crane, a tensioner drum provided on the base frame for winding a hoisting wire rope, and a brake device for applying a brake to rotation of the tensioner drum; A simple wire tensioning machine, wherein a tensioned wire rope is supplied from a tensioning machine drum to a hoisting winch drum of a tower crane.