JPH0743110Y2 - Tower crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a tower crane.

[Prior Art] A general tower crane will be described with reference to FIG.

A lower end of a post 3 is pivotally attached to a revolving frame 2 provided on an upper portion of a vehicle 1, and a post hoisting cable 4 from a winch (not shown) attached to the revolving frame 2 is attached to an upper end of the post 3.
The tip 3 is connected, and the post 3 is hoisted and unwound by a winch so that the post 3 can be hoisted.

The rear end of the jib 5 is pivotally attached to the front end of the upper end of the post 3 so that the jib 5 can be lifted up, and a strut 9 as will be described later is formed by combining three rod-shaped A struts 6, B struts 7, and C struts 8 in a triangular shape. The post 3 is pivotally attached to the upper end of the post 3 so as to be rotatable in a direction parallel to the jib 5, and the strut 9 and the tip of the jib 5 are connected by a jib support cable 10 of a predetermined length and suspended from the strut 9. An equalizer sheave 12, which is a moving pulley, is attached to the lower end of the pendant cable 11 having a length, and a winch (not shown) to a jib undulating cable (not shown) is provided between the equalizer sheave 12 and the equalizer sheave 13, which is a constant pulley provided on the turning frame 2. By winding 14 and winding and unwinding the jib undulating cable 14 with a winch, the equalizer sheave 12, which is a moving pulley, is moved up and down to make a pendant cable. Allow the jib 5 to be elevated via the bull 11, strut 9 and jib support cable 10.

A hook lifting cable 15 from another winch (not shown) provided on the swivel frame 2 is hung between the upper end of the post 3 and the tip of the jib 5, and then the hook 16 is suspended and supported to fix the tip of the hook to the tip of the jib 5. The hook 16 can be moved up and down by winding and rewinding the hook lifting cable 15.

Therefore, in the tower crane described above, the post erection cable 4 is wound to make the post 3 stand up and then the swing frame 2
The jib 5 is swung with the jib undulation cable 14 to change the vertical angle of the jib 5, that is, the jib angle, and the hook elevating cable 15 is used to elevate the hook 16 or a combination of these operations is performed. It was done like this.

In addition, the tower crane is used by disassembling it and then performing assembly work, and when the work is finished, disassembling and carrying it away again.

Therefore, in the conventional tower crane, the strut 9 is hinged at both ends of the A strut 6 as shown by the solid line in FIG.
The B struts 7 and the C struts 8 are pivotally attached so that the B struts 7 and the C struts 8 can be folded in three around 17, 18, and the tips of the B struts 7 and the C struts 8 are overlapped with each other as shown by phantom lines in FIG. The structure was such that it could be assembled in a triangular shape by connecting with.

20 is a step attached to the B strut 7.

Assembly of a tower crane using such a strut 9 has been performed as follows.

That is, first, as shown in FIG. 7, the turning frame 2 of the vehicle 1
On the other hand, the lower end of the post 3 which is laid horizontally on the ground is pivotally attached, and then the B struts 7 and the C struts 8 are pivotally attached on the ground, and the struts 9 are shown in phantom in FIG. Assembled in a triangular shape and lifted up the assembled strut 9 with a sling wire 21 of another crane (not shown).
After the pivots of the struts 6 and the B struts 7 are pivotally attached to the upper end portion of the post 3, the worker climbs the step 20 of the B struts 7 and removes the sling wire 21 of the other crane from the struts 9. Connect the pendant cable 11 to the strut 9.

After that, as shown in FIG. 8, the post undulation cable 4 wound around a winch (not shown) provided on the swivel frame 2 is connected to the upper end portion of the post 3 so that the post 3 can be undulated, and the pendant is pendant. The jib undulating cable 14 wound around the winch 22 is hung between the equalizer sheave 12 of the cable 11 and the equalizer sheave 13 of the revolving frame 2 so that the strut 9 can be tilted, and the strut 9 is tilted downward to The posts 3 are tilted upward while the pivotally connecting portions of the struts 6 and the B struts 7 are kept in contact with the ground, and the upper end portion of the post 3 is slightly lifted. 5
The jib support cable 10 is arranged between the strut 9 and the tip of the jib 5 while the rear end of the hook is pivotally attached. And attach the hook 16.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional tower crane, as shown in FIG. 6, the B struts 7 and the C struts 8 can be folded in three around the hinges 17 and 18 at both ends of the A strut 6. Therefore, as shown in FIG. 7, in order to attach the strut 9 to the upper end portion of the horizontal post 3, the B strut 7 and the C strut 8 are pivotally attached at the ground portion to form a triangular shape. It had to be lifted after it had been assembled, which required a separate crane for this.

Further, at this time, since the strut 9 is in a suspended state, it is difficult and time-consuming to pivotally attach the horizontal post 3 to the upper end portion.

Further, the step of removing the sling wire 20 of the other crane and connecting the pendant cable 11 from the strut 9 pivotally attached to the upper end of the horizontal post 3 is performed by the worker on the side surface of the B strut 7. It was very dangerous because we had to climb 20 and get up high.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a tower crane capable of safely and quickly attaching a strut to a post on the ground without using another crane.

[Means for Solving the Problems] According to the present invention, a member forming one side of a strut is divided into two rods and a small link interposed between corresponding ends of the rods. A tower crane characterized in that the rod and one end of the small link, and the other end of the small link and the other rod are rotatably pivotally attached to each other so that they can be bent and extended. It is a thing.

[Operation] When the member forming one side of the strut is bent, the strut is folded, and when the member forming one side of the strut is extended, the strut becomes triangular.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention.

One end of a rod-shaped A strut 23 and one end of a rod-shaped B strut 24 are pivotally attached to each other by a hinge 25 so that they can be rotated.
Between the other end of the strut 23 and the other end of the B strut 24, a C strut 26, which is bendable and expandable in the middle, is rotatably connected using hinges 27 and 28.

The C-struts 26 pivotally connect the ends of two short rods 29, 30 to different surfaces of both ends of the small link 31 so that they can be bent and extended using pins 32, 33. Extensions 34 and 35 extending in the axial direction of the rods 29 and 30 are formed at the ends of the rods 29 and 30 that are pivotally attached to the small links 31, and the extensions 34 and 35 are formed when the rods 29 and 30 are extended in a straight line. , 35 form pin holes 37, 38, 39 for inserting the lock pin 36 penetrating the extension portions 34, 35 and the small link 31 at the position where they overlap each other, and the A struts 23 and B struts 24 on both sides of the small link 31 are formed. Short rods 29, 30 when the short rods 29, 30 of the part on the remote side with respect to the hinge 25 to be pivoted are extended in a straight line
The stoppers 40 and 41 are fixed to the positions of the extension 30 and 30 which come into contact with the extension portions 34 and 35.

Reference numeral 42 is a link for connecting the other ends of the A strut 23 and the B strut 24 in a folded state and connecting a pendant cable, and the B strut 24 has a step.
20 is not always required.

Next, a procedure for assembling a tower crane using the above-mentioned strut according to the present invention will be described with reference to FIGS. The same parts as those in FIG. 7 in FIG. 4 are designated by the same reference numerals.

First, the lower end portion of the post 3 which is laid horizontally on the ground is pivotally attached to the turning frame 2 of the vehicle 1, and then the strut in the folded state as shown by the solid line in FIGS. 1 and 4. A hinge 25 portion pivotally connecting one end of the A strut 23 and the B strut 24 is pivotally attached to the upper end portion of the post 3 and a link 42 connecting the other ends of the A strut 23 and the B strut 24 to each other. The pivoted end of the A-strut 23 side is released, and the pendant cable 11 is connected to the pivoted end. The pendant cable 11 is fixed between the equalizer sheave 12 and the swivel frame 2 (not shown). The jib undulating cable wound around the winch of the revolving frame 2 is wound around.

When the winch is wound in this state, the equalizer sheave 12 and the pendant cable 11 are pulled toward the revolving frame 2 side, the B strut 24 is tilted upward, and the C strut is shown by phantom lines in FIGS. 1 and 4. 26 is stopper 40, 41
Struts are assembled in a triangular shape by extending until they are stopped by.

When the struts become triangular, the lock pins 36 are inserted through the extension portions 34, 35 formed in the short rods 29, 30 and the pin holes 37, 38, 39 of the small links 31 to fix the C struts 26 in a straight line.

Strut mounting work during this period can be done on the ground without using a separate crane.

Thereafter, a tower crane is assembled by attaching a jib to the upper end portion of the post 3 and a hook at the tip of the jib in a manner similar to that shown in FIG.

Incidentally, the tower crane of the present invention is not limited to the above-mentioned embodiment, the means for bending and extending the C struts is arbitrary, the forming positions of the stopper, the lock pin and the like are arbitrary, and the like. Needless to say, various changes can be made without departing from the scope of the present invention.

[Advantages of the Invention] As described above, according to the tower crane of the present invention, since the member forming one side of the strut can be bent and extended, the strut post can be performed without using another crane and only by the ground work. Can be attached to the rod, and the work can be speeded up and the safety can be improved. Further, the above member is used as two rods and a small link interposed between the corresponding ends of the rods. It is divided into three parts, and one rod and one end of the small link are pivotally attached to each other, and the other end of the small link and the other rod are pivotally attached to each other so that they can be bent and extended. Therefore, when folded, even if there is a difference in the length between both rods, the small link tilts and absorbs the difference in length, so it can be folded up to the point where both rods are parallel Improve It is possible to achieve the excellent effect that the small links can be tilted at the time of folding and the lengths of both rods can be freely set.

[Brief description of drawings]

1 is a side view of an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a side view of FIG. 2, and FIG. 4 is a case of using the strut of FIG. 5 is an overall view of a conventional tower crane, FIG. 6 is a side view of a conventional strut, and FIG. 7 is an assembly description of a tower crane using the strut of FIG. FIG. 8 and FIG. 8 are explanatory views of assembly of the tower crane subsequent to FIG. In the figure, 3 is a post, 5 is a jib, 10 is a jib support cable, 23
Indicates A strut, 24 indicates B strut, and 26 indicates C strut.

Claims (1)

[Scope of utility model registration request] 1. A tower crane in which a triangular strut is rotatably pivotally attached to the upper end of a post, and a member forming one side of the strut is provided between two rods and corresponding end portions of each rod. By dividing the rod into three parts with the intervening small link, and pivotally connecting one rod and one end of the small link, and the other end of the small link and the other rod, respectively, so that the rod is bent. A tower crane characterized by being able to extend.