JPH0349879B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for preparing a wire rope for a large temporary crane, etc., and specifically relates to a method for preparing a wire rope for a crane using a messenger device. be.

<Conventional technology> For example, when loading a crane wire rope into a large temporary crane, conventionally a small diameter guide wire rope is strung around a sheave at the tip of the boom and the top of the guy support, and then the crane wire rope is attached to the guide wire rope. The guide wire rope was wound around the winch drum, and the wire rope for the crane was guided by the winch drum to let out the crane wire rope along the same route.

<Problems to be Solved by the Invention> However, when the guide wire rope is stretched around the crane wire rope sheave in this way, a scaffold for traveling must be installed on the boom, and a temporary support for the guide wire rope must be installed. It was necessary to attach a single tube, etc., and it was also necessary for the worker to walk on the boom to load the guide wire rope the same number of times as the number of turns of the crane wire rope. . Therefore, preparing the wire rope requires about twice as many workers as normal work, which may result in an excessive economic burden, or the possibility of the guide wire rope becoming disconnected from the crane wire rope. Due to the nature of the preparation, there was a demand for some kind of improvement in order to improve the dangerous and laborious preparation work.

The present invention was devised to satisfy such a need, and an object of the present invention is to provide a novel wire rope preparation method that allows crane wire rope to be prepared easily and safely.

<Means for Solving the Problems> In order to achieve the above object, in the present invention, a guy support is erected on a revolving body installed at the top of the mast of a crane, and the tip of the guy support and the tip of the boom of the crane are connected. When winding a wire rope for a crane between these sheaves, an endless winch is installed on the revolving body, a sheave for the messenger wire rope is installed near the sheave, By winding the messenger wire rope let out from a winch around a messenger wire rope sheave, and detachably coupling the crane wire rope and the messenger wire rope via a catch clamp, the endless It is characterized in that the crane wire rope is sequentially fed into the crane wire rope sheave as the messenger wire rope is rotated by the operation of the winch.

<Function> As a result, the wire rope for the crane can be moved back and forth between the tip of the boom and the sheave at the top of the guy support using the rotation of the wire rope fed out from the endless winch, making it easy to move the wire rope for the crane. We are making sure that it can be prepared safely.

<Examples> Examples of the present invention will be described in detail below based on the drawings.

In the figure, a tower crane configured by fixing the base end of a guy support 3 to the top of a mast 1 via a revolving body 2 and pivoting the base end of a boom 4 so as to be able to freely rotate up and down is known, and the present invention Here, sheaves 5 and 6 for messenger wire ropes are provided at the top of the guy support 3 and the tip of the boom 4, respectively, and an endless winch 7 is attached to the revolving structure 2. Then, by winding the messenger wire rope 8 fed out from the endless winch 7 around each of the sheaves 5 and 6, when the endless winch 7 is operated, the sheave attached to the top of the guy support 3 is passed from the endless winch 7. 5 to a sheave 6 provided at the tip of the boom 4, the wire rope 8 can be reciprocated. Reference numerals 9 and 10 are sheaves for the crane wire rope 11 attached to the top of the guy support 3 and the tip of the boom 4, and as shown in FIG. 6 is located near these and the winding paths are close to each other, so that the messenger wire rope 8 and the crane wire rope 10 can be removably connected via the catch clamp 12. I have to.

Incidentally, the catch clamp 12 is, for example, the sixth
As shown in FIGS. 9 to 9, a pair of clamps 13 and 14 having a substantially U-shaped cross section that slidably fit onto the messenger wire rope 8 and the crane wire rope 11 are connected to a pin 15. are connected via. And each clamp 13,1
By pivoting levers 18 and 19 to the openings of 4 through pins 16 and 17, respectively, so that the levers 18 and 19 are tilted, the levers 1
The wire ropes 8, 11 are pressed and fixed to the bottoms of the clamps 13, 14 by the cams 20, 21 formed at the bases of the wire ropes 8, 19, and the engaging claws 22, 23 formed on the cams 20, 21 are attached to the wire ropes 8, 19.
11 put these wire ropes into the food 8,1
1 and clamps 13 and 14 from relative movement. Reference numerals 24 and 25 are stoppers for fixing the levers 18 and 19 to the clamps 13 and 14. By pulling out the spring pins 26 and 27, the pins 16 and 17 can be removed and placed in any position on the wire ropes 8 and 11. Clamps 13 and 14 can be attached.

Next, a procedure for loading the crane wire rope 11 into the tower crane configured as described above will be explained. First, when assembling the guy support 3 and boom 4, the wire wire 8 is let out from the endless winch 7, and the sheave 5,
6, return to the endless winch 7 and wind it. This work is similar to the first reciprocating winding of the guide wire rope, and can be performed on the ground at the tip of the boom 4, as shown in FIG.

From this state, as shown in FIG.
The endless winch 7 is operated so that the crane wire rope 11 moves toward the tip of the boom 4.

In this way, the crane wire rope 11
When the tip of the wire rope 11 is fed close to the tip of the boom 4, the tip of the wire rope 11 is manually passed through the sheave 10, and then the wire rope 8 is reattached using another catch clamp 12.
, and remove the previously attached catch clamp 12. Next, the endless winch 7 is operated in the opposite direction to the above, and the crane wire rope 1 is moved to the vicinity of the upper end of the guy support 3.
1, manually pass the crane wire rope 11 through the sheave 9 at the upper end of the guy support 3, connect the tip to the messenger wire rope 8 again, and repeat the same procedure to remove the wire 11. Complete the preparation. During this time, in the middle of the boom 4, the messenger wire rope 8 and the crane wire rope 11 are all moved only by the drive of the endless winch 7, so there is no need for workers to move in the middle of the boom 4. do not.

In addition, when attaching and detaching the catch clamp 12,
Although it is necessary to engage and disengage the stoppers 24 and 25, and to attach and detach the pins 16 and 17 and the levers 18 and 19, which involves inserting and detaching the spring pins 26 and 27, it is necessary to manually attach and detach the crane wire rope 11 as in the past.
The number of man-hours required can be significantly reduced, and safety can be improved.

In the example, two catch clamps are used to improve workability when passing the crane wire rope through the sheave, but the number and specific structure of the catch clamps will vary depending on the implementation. Not limited to examples.

<Effects of the Invention> As explained above, in the present invention, by running an endless messenger wire rope installed in advance in the vicinity of the crane wire rope, this messenger wire rope can be wound. Since the crane wire rope is fed in by hand, there is no need to manually feed the heavy crane wire rope as in the past. For this reason, there is no need to install walking scaffolding or a wire receiver made of a single pipe on the boom for the purpose of loading the wire, and there is no need to walk on the boom, which can be dangerous, so the wire can be loaded. Workability is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a tower crane for carrying out the method according to the present invention, and FIG. 2 also shows the relationship between the crane wire rope sheave and the messenger wire rope sheave at the top of the guy support and the tip of the boom. Schematic plan view shown, 3rd
The figure is a side view of Fig. 2, Fig. 4 is a side view showing the state of connection by the catch clamp, Fig. 5 is a schematic side view showing the state in which the crane wire rope is passed through the sheave at the tip of the boom, and Fig. 6 is Figure 7 is an enlarged side view of a specific example of a catch clamp.
8 is a sectional view taken from FIG. 6, and FIG. 9 is a sectional view showing details of a stopper used in the catch clamp. 2...Swivel body, 3...Guy support, 4...Boom,
5, 6...Sheave for messenger wire rope, 7...Endless winch, 8...Messenger wire rope, 9,10...Sheave for wire rope for crane, 11...Wire rope for crane, 12...Catch clamp.

Claims (1)

[Claims] 1. A guy support is erected on a revolving body installed at the top of the mast of a crane, a sheave is provided at the tip of the guy support and the tip of the boom of the crane, and a wire rope for the crane is installed between these sheaves. When winding the Messenger wire rope, an endless winch is installed on the revolving body, and a sheave for the Messenger wire rope is installed near the sheave, and the Messenger wire rope let out from the endless winch is wrapped around the Messenger wire rope. The crane wire rope and the messenger wire rope are releasably connected to each other through a catch clamp. A crane wire rope preparation method characterized by sequentially feeding the crane wire rope into a crane wire rope sheave. 2. The crane wire rope loading method according to claim 1, wherein the messenger wire and the crane wire rope are detachably connected using two catch clamps.