JP2621587B2 - High head construction crane - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-lift construction crane, which can easily handle a hoisting line by a hoist mounted on a main body of the crane. Regarding the configuration.

Background of the Invention and Problems: In a construction crane, a hoist for operating a hoisting line (also called a hanging line) for lifting materials and the like is mounted on the crane body. I have. In recent years, due to the remarkable progress in construction technology and the rise in land prices, the construction of high-rise buildings has been increasing in urban areas, and the cranes used in conjunction with these facilities are equipped with a function that can lift and lower materials at high head. Requirements have come to be required.

However, as a crane capable of performing such a high-head operation, it is needless to say that the capacity of the hoist to be mounted is of a high-head type. However, as a hoist, since a hoisting line is wound on a bobbin and a load such as a material is lifted, the winding amount is large. In a hoist having a large winding amount, the winding drum becomes large. That is, excessive winding of the hoisting rope around the winding drum is required even if the ropes are aligned and wound at the time of winding. When the load is excessive, the load is constantly acting on this cable, so the upper layer cable is entangled in the lower layer cable, and the resistance increases at the time of extension, damaging the strand and preventing smooth extension. And many other drawbacks.

Problems to be Solved: Under such circumstances, attempts have been made to mount an endless type hoist having a configuration in which the operation of unwinding and winding up a hoisting line can be performed without taking up a long line while receiving a load. . In this endless type hoist, a traction force is usually obtained by winding a hoisting rope around two drums arranged in parallel at appropriate intervals a plurality of times. The cable is wound on a take-up reel and fed out while being given a predetermined tension, so that a rope not directly involved in the load side is accommodated. However, as a hoist that can be used by mounting it on a construction crane for a high-rise building, it must be mounted on the swivel of the crane, so the installation space is limited, and the reel is taken up from the winding drum. As the length of the rope to be wound becomes longer, the winding diameter, that is, the number of winding steps naturally becomes excessively large as compared with ordinary handling, so that the winding becomes irregular, which is inconvenient in winding and unwinding.

Therefore, in the present invention, the winding reel of the hoisting rope in the construction crane equipped with the high-lift hoist, when winding the no-load side rope from the hoist, to prevent random winding. It is an object of the present invention to provide a high-lift construction crane capable of always performing a smooth hoisting operation.

Means for Solving the Problems: The present invention relates to a high-lift construction crane, and an endless hoist installed at an appropriate position of a swivel structure of a crane body above a jib support frame erected above a swivel unit. A guide pulley for a hoisting rope that can be wound up and unreeled from the no-load side is attached, and the hoisting rope is wound around the take-up reel within the fleet angle limited range by circling the guide pulley.

As the endless type hoist mounted on the crane body according to the present invention, a hoisting rope to be handled can be adopted that can simultaneously drive two strands of an S twisted strand and a Z twisted strand.

The high-lift construction crane of the present invention includes not only a climbing crane but also a construction-frame-mounted crane.In the case of a jib-up / down crane, the hoisting rope is wound around a take-up reel. It is preferable that a take-out / feed-out guide pulley is attached to the top of the jib support frame. In the case of a horizontal jib crane, it is preferable that the hoisting rope be attached to a member that has a guide pulley that winds up and out of the take-up reel and protrudes toward the counter jib at the top of the jib support frame.

Operation: In the high-lift construction crane constructed as described above, when the hoisting line is operated by the endless hoist to lift materials and the like, especially when the hoisting operation is performed, the unloading side of the hoist is operated. The ropes that are fed out to the jig support frame are temporarily attached to the top of the jib support frame, go around the guide pulley far away from the take-up reel, and are taken up by the take-up reel, so that the fleet angle is within the limit value range. Even if the reel fits, and thus is wound on the reel in a multilayer manner, the reel side is wound neatly without a large tensile force acting on the rope, so that smooth operation can be performed without being wound. In addition, the non-load side of the hoist is guided to the guide pulley attached to the top of the jib support frame to wind and unwind, so that even if there is a narrow space, the end register type hoist is mounted and used. can do.

If the above-mentioned endless type hoist is equipped with one that drives two hoisting ropes of S-twist and Z-twist at the same time, the hoisting rope can be moved from the jib tip to the hook block at the time of high-descent work. Can be prevented from being twisted in the hanging part, and the lifting operation can be performed more smoothly.

Advantageous Effects of the Invention: According to the present invention, in handling a hoisting line, an endless type hoist is mounted on a crane main body, and no matter how high the working head becomes, the winding of the line on the no-load side is performed. Unwinding can be carried out reliably with the take-up reel, and it is possible to cope with ultra-high head work without any hindrance by using a crane installed using the building frame, etc., especially with S twist and Z twist. By using two hoisting ropes,
The rotation of the suspended article due to the twisting of the rope in the lifting and lowering section can be prevented, and the work at a higher head can be performed more smoothly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a construction crane according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a construction crane 10 of an up-and-down jib type, in which 11 is a tower, 12 an outer mast, 13 is a climbing device, and 14 is a turning mechanism 15 on a top of an outer mast 12. It is a supported crane body. 16 is the crane body
This is a jib pivotally supported at its base end on a 14 turntable 17 and raised and lowered by an undulating cord 18. 20 is a jib support frame. Reference numeral 25 denotes a jib hoisting winch for operating the hoisting cable 18. 26 is an endless type hoist and has two drums 26 ', 2
At 6 ", an S-twisted cable and a Z-twisted cable are wound and driven synchronously. 27 is a take-up reel of a hoisting cable. 28 is a hoisting rope, and S
Twisted ropes and Z-twisted ropes are used one by one.

As shown in FIG. 3, the hoisting rope 28 has its tip connected to a hook block 35 via a connector 35 ', and the other ends respectively go around pulleys 32, 32 provided on the tip side of the jib 16 to support the jib. It goes around the pulleys 33, 33 attached to the top end of the frame 20 to reach the load-side drum 26 'of the hoist 26, and from the no-load-side drum 26 "of the hoist 26 to the rear side of the top of the jib support frame 20. After being wrapped around each of the attached guide pulleys 34, it is wrapped around so as to be wound on each reel of the take-up reel 27. Then, any one of the S stranded cable or the Z stranded cable of the winding cable 28 is used. A pulley 36 is provided at an appropriate position from the load-side drum 26 'of the hoist 26 to the pulley 33 at the top of the jib support frame, and is associated with the limit switch 31 for detecting an overload.
In addition, in the hoisting rope 28 portion hanging down from the pulleys 32 provided on both sides of the tip of the jib, the S and Z double twisted wires are arranged side by side to drop down to the connecting tool 35 'of the hook block 35, thereby twisting the rope. The twist caused by the two is canceled out by both, and the hook block 35 suspends the material and the like.
As illustrated in FIG. 2, the guide pulleys 34 are provided just above the hoist 26 and the take-up reel 27, and are wound on each of the take-up reels 27. The ropes 28 are wound so that the fleet angles are all within 2 mm. Therefore, even if the rope is wound around the take-up reel 27 in multiple stages, it can be wound neatly without causing displacement. Moreover, as is well known, the reel of the take-up reel 27 is wound by a torque motor (the hoisting rope 2).
8) is wound with a predetermined tension. On the take-up reel side, the load at the time of lifting and lowering the material or the like does not directly act on the hoisting rope 28, so that the hoisting rope 28 cannot reach the limit of the reel winding. It can be wound without. In addition, since there is a sufficient distance in the relationship between the guide pulley 34 and the unwinding / winding position from the no-load side of the hoist 26, the guide rollers provided on the guide portion 26a of the hoist 26 The normal operation is always guaranteed without any irregular load.

As described above, in the present invention, by using the endless type hoist 26, the accompanying treatment of the hoisting rope 28 is performed by disposing the guide pulley 34 on the top of the jib support frame 20 and circling the guide pulley 34. By configuring so that the fleet angle with respect to the take-up reel 27 is within the control range, the hoist 26 and the take-up reel 27 are installed in a narrow space,
This has made it possible to realize a crane that can perform lifting and lowering work at an ultra-high head (150-300 m), which was difficult to handle with conventional drum winding type hoists.

Next, FIG. 4 shows a horizontal jib type construction crane 10.
A, the construction crane of this type can also be used as a construction crane with an ultra-high head by adopting the same structure as that of the jib hoisting type.
That is, the endless hoist 26 is provided with a counter jib 41.
And a take-up reel 27 is installed in the vicinity of the hoist 26, and a hoisting rope 28 for feeding and winding up from the no-load side of the hoist 26 is mounted on a counter jib from the top of the jib support frame 42. Horizontal beam protruding to the 41 side for hanging the tower
43 Take up the guide pulley 44 attached to the end and take up the take-up reel
By winding the reel 27 so as to reach the reel 27, the handling of the hoisting rope 28 between the hoisting machine 26 and the take-up reel 27 can be made in a state where the winding of the reel can be performed without difficulty. Needless to say, the guide pulley 44 is provided at a position where the load side and the no-load side of the hoisting rope 28 do not intersect.

Above, we explained the climbing type tower crane (the figure is shown as a free-standing shape, but in the case of a high-rise building, it is naturally a floor climbing type with the tower supported by the building frame). Cranes (not shown) that are installed and used in
The hoist 26 and the take-up reel can be mounted and used on the crane main body 14 in the same manner as in the above embodiment.

[Brief description of the drawings]

Fig. 1 is a schematic view of a jib-raising construction crane according to the present invention, Fig. 2 is an enlarged side view of a main part, Fig. 3 is a view showing a roping mode of a hoisting line, and Fig. 4 is a view of the present invention. 1 is a schematic diagram of a horizontal jib-type construction crane based on the above. 10… Jib hoisting type construction crane 10A …… Jib horizontal type construction crane 11 …… Tower, 12 …… Outer mast 13 …… Climbing equipment, 14 …… Crane body 15 …… Slewing mechanism, 16 …… Jib 17 ... Swirl wheel, 18 ... Undulating cable 20,42 ... Jib support frame 25 ... Jib hoisting winch 26 ... Endless type hoisting machine 27 ... Road take-up reel, 28 ... Hoisting cable 32 ... Pulley on the side of the tip of the shib 33 ... Pulley on the top end of the jib support frame 34, 44 ... Guide pulley, 35 ... Hook block 41 ... Counter jib, 43 ... Horizontal beam

Claims (2)

(57) [Claims] 1. A crane for high-lift construction, which winds above a jib support frame erected above a turning portion from a no-load side of an endless hoist installed at a proper position of a turning structure of a crane body. A crane for high-lift construction, comprising a guide pulley for a hoisting line to be fed out, and a hoisting line wound around the take-up reel within a limited fleet angle range around the guide pulley. 2. The lift according to claim 1, wherein the endless type hoist mounted on the crane body is capable of simultaneously driving two hoisting ropes of an S twisted rope and a Z twisted rope. Construction crane.