JPH0656387A - Construction crane - Google Patents

Abstract

PURPOSE:To provide a construction crane that is able to make an expansion boom constituting a crane part and its support frame perform the carrying in-and-out of material and equipment safely to or from the mid floors of a building freely from the outside at an optional position along a mast, and besides, usable at high lift. CONSTITUTION:This crane comprises a mast 10 to be erected after being supported by a support 15 from the sidepiece of a building, a support frame 20 to be equipped free of lifting motion along this mast 10, a winding machine 35 being mounted on this support frame 20 via a turning plate and an expansion boom 30, and in this constitution, a guide rail 12 and a rack 13 are installed in a side face of the mast 10, while the support frame 20 is guided by the guide rail 12 of the mast 10 and drives a gear in mesh with the rack 13 and being made free of lifting motion, and a fixed means 27 lockable at an optional position to the mast 10 is installed in this support frame 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction crane, and enables a hoisted object to be hung in and carried out by expanding and contracting a boom from the outside with respect to a required floor of a building under construction. Related to construction cranes.

[0002]

2. Description of the Related Art Conventionally, for example, when building a high-rise building, in order to use a construction crane to lift and lift equipment, a jib-type construction crane is generally installed at a position close to the construction. There is. In this construction crane, equipment is loaded into and unloaded from the building under construction through an opening provided at the top of the building.

In the operation of loading and unloading equipment and the like into and from a building by means of such a construction crane, the height of the building is so high that the building is assembled to the upper layer, and the height is once higher than the required height. Since it is hung up and then hung down again at the required position in the building through the upper opening, the work time becomes long and the work efficiency becomes poor. Also,
When the lift is high, handling of cargo at a position with bad scaffolding becomes dangerous under bad weather conditions, and this cargo handling work must be stopped.

Therefore, for the purpose of solving such a problem, a multi-stage telescopic boom is mounted on a revolving structure which can be moved up and down along a self-standing mast, and is installed inside a building at a required height position. A crane that can be lifted and lowered by moving a boom in and out of the boom is disclosed in, for example, JP-A-59-86592, JP-A-59-114293, or JP-A-SHO-5.
9-172388, and the like.

[0005]

However, in the prior art, a structure in which a telescopic boom is attached to a support frame which is supported by being fitted and supported on a mast that stands on the side of a building and can be moved up and down. Therefore, the telescopic boom is convenient for turning, but there is a limit to the mast's independence to perform the work of extending and retracting the telescopic boom to load and unload equipment to the required floor, and it is difficult to construct a building that is too expensive. Not applicable to work. Moreover, if the self-standing type is used, the mast and the like must be made sturdy, which is expensive. After the hoisting work within the allowable self-supporting range, the mast is supported from the structure of the building by the support, and the horizontal retraction work is performed within the support limit above the support position. Although it can be used in a high lift, such a method has a disadvantage that the working range is inevitably limited by the mounting position of the support and the like and the free working cannot be performed.

In particular, the work of loading and unloading equipment and the like to and from the middle floor of a building is necessary even when the construction work is in a considerably advanced state, and the crane of the above-mentioned type has a high lift. When carrying in equipment from the outside to the lower floors from the outside, the telescopic boom and its supporting frame can not descend along the mast due to the support except for using it in an independent state, which hinders the work. .

According to the present invention, the above problems are solved, and the mast can be supported by a structure at an arbitrary position to support a high lift, and the telescopic boom and its supporting frame forming the crane part can support the mast. It is an object of the present invention to provide a construction crane that can be fixed at any position along the road so that equipment can be safely loaded and unloaded from the outside.

[0008]

In order to achieve the above object, the present invention provides a mast which is supported by a support from a building and stands upright, and a support frame which is vertically movable along the mast. , Including a hoist and a telescopic boom mounted on the support frame via a revolving structure, and a guide rail and a rack are provided along a side surface of the mast,
The support frame is guided by the guide rails of the mast and can be moved up and down by driving a gear that meshes with a rack. The support frame is provided with fixing means that can be fixed to the mast at an arbitrary position. And

[0009]

As described above, in the construction crane of the present invention, since the mast is supported by the structure by the support, the crane part (support frame and telescopic boom) is lifted to a high position regardless of the lift. You can descend. The crane part is guided by the guide rails installed along the mast, and the support frame can be raised and lowered by the meshing drive of the rack and the gears, so that the telescopic boom can be contracted according to the work condition. The crane can be lifted up and down, and the crane part can be moved to the desired position for loading and unloading. In addition, in order to perform hoisting work after moving the crane part to the required position, by operating the fixing means attached to the support frame and connecting it to the main part of the mast at an arbitrary position, this fixing means can be operated. The support frame can be fixed, and in addition to the engagement between the rack and the gear, by the operation of the fixing means, the support frame is securely fixed to the mast and the telescopic boom is operated to safely lift and lift equipment and buildings. It can be carried in or out of the.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the construction crane of the present invention will be described below with reference to the drawings of the specific examples. FIG. 1 is an overall front view of a construction crane according to the present invention, which also shows a mode in which a telescopic boom is inserted into a middle floor of a building.
FIG. 2 is an enlarged front view of a main part, and a support part is partially omitted. FIG. 3 is a plan view of FIG. FIG. 4 is a right side view of FIG.

In these drawings, a mast 10 which constitutes a construction crane is erected in the vicinity of a building by a support 15 supported by the building frame A so that it can be lifted and lowered on one side of the mast 10. The crane unit 1 is equipped with 20 and the telescopic boom 30 and the hoist 35 are mounted on the support frame 20 via a revolving structure to form the crane unit 1.

The mast 10 has a structure that can be replenished to a required height in sequence, and a pair of guide rails 12 are provided on the side surfaces of the vertical main members 11 on one side and a rack 13 is provided in parallel between the guide rails 12 and 12. And are installed respectively. The guide rail 12 is made of, for example, square steel and is attached to the vertical main member 11 so that the three surfaces thereof serve as guide surfaces. The mast 10 is configured to be supported by the support 15 on the building frame A under construction on the side opposite to the rack 13 mounting side in the height direction at a required interval.

A support frame 20 that constitutes the crane unit 1.
Is a frame structure having a length capable of obtaining a reaction force capable of responding to a moment due to a suspension load, and a pair of supports provided at the upper and lower ends of the support frame 20 on the side surface of the mast 10 to which the rack 13 is attached. The guide rollers 22 and 22 'attached to the bracket 22A are the guide rails of the mast 10.
The rack 12 is abutted so as to be sandwiched from both front and rear directions, and a gear for driving (described later) is meshed with the rack 13 so as to be vertically movable.

On both sides of the frame structure of the support frame 20, side guide rollers 23 similar to the above-mentioned guide rollers 22 and 22 'are attached to the support bracket 23A so as to approach the upper and lower end portions, respectively. It is designed so that it can be guided up and down while preventing sway in the direction. Then, inside the frame structure, a reduction motor 25 is attached to a mounting board 21 provided to face the mast 10, and a gear 26 attached to the output shaft of the reduction motor 25 is attached to the mast 10 and a rack 13 installed along the mast 10. The support frame 20 can be moved up and down along the mast 10 by meshing with each other and driving the reduction motor 25.

Further, the support frame 20 is fixed to the upper part of the frame structure so that the guide frames 12 attached to both vertical main members 11 of the mast 10 can be gripped to fix the support frame 20 to the mast 10. Means 27 are attached. As an example of the fixing means 27, one as shown in FIG. 5 can be adopted. The one shown in FIG. 5 is of the clamp type, and the mast 10 is attached to the support frame 20 side.
To the clamp movable part 27b that has a jaw 27b 'that is arranged to move forward and backward in a sheath 27a that is provided at a right angle to the rear end with a bracket 27c that is attached to the end opposite to the jaw 27b'. A hydraulic cylinder 27d for connecting and supporting the parts is provided, a clamp shoe 27e is attached to the tip of a piston rod 27d 'of this hydraulic cylinder 27d, and a clamp shoe 27e' is also attached to the jaw portion 27b '. When the piston rod 27d 'is pushed out by the operation of the cylinder 27d, the jaw 27b' of the clamp movable part 27b which is connected by the reaction force is also drawn, and the clamp shoe 27e 'attached to the jaw 27b' and the piston rod The guide rail 12 of the mast 10 can be gripped and fixed by the clamp shoe 27e on the 27d 'side. In the figure, reference numeral 27f is a hydraulic cylinder 27.
It is fixed to the sheath cylinder 27a with a support piece for preventing the displacement of the position d. Of course, a clamp structure other than the above may be used. In addition, a centrifugal force actuated fall prevention device 29 is attached to the lower part, which can prevent a fall when a speed is input by the rotation of a gear meshing with the rack 13 and a falling speed exceeds a set speed and a braking force acts to prevent the fall.

At the top of such a support frame 20, a turning table 32 (corresponding to a turning body) equipped with a turning drive mechanism is mounted on a mounting base 31, and a boom support standing upright on the turning table 32.
A telescopic boom 30 is provided via 33. The telescopic boom 30 is a known telescopic boom, is configured to be telescopic by a hydraulic cylinder (not shown), has its base end supported by a pin above the boom support 33, and is undulated by a hydraulic cylinder 34 for undulation. It is supported. The hoist 35 is mounted on the base end of the telescopic boom 30. The suspension line 36 extended from the hoist 35 goes around pulleys 37, 37a, 37b, 37c attached to the tip end of the telescopic boom 30, and its end is not shown in the base end side of the telescopic boom 30 and is not shown. It is connected via a switch, and the suspension block 38 is hung at the tip of the telescopic boom 30 in the middle of the suspension line 36.

In the construction crane of the present invention thus constructed, the mast 10 is erected by being supported by the support 15 on the side opposite to the side on which the crane part 1 is mounted, and the crane part 1 is supported during use. The reduction motor 25 mounted on the frame 20 is driven to move up and down to an arbitrary position to lift and lower equipment. When the support frame 20 is moved up and down, the telescopic boom 30 can be contracted to make it bulky and movable. Therefore, it is possible to move up and down while suspending equipment.
When the crane unit 1 is moved up and down to the position corresponding to the required work floor and then the loading and unloading work of the equipment and the like is continued at the position, the fixing means 27 is operated to operate the guide rails 12, 12 attached to the mast 10. The support frame 20 is fixed so as to grip. After that, the hoist 35 is driven to suspend the rope.
By carrying out or winding 36, hoisting and hoisting the target equipment, and carrying out the up-and-down swing of the telescopic boom 30 and the telescopic operation, the carry-in or carry-out work can be performed between the inside and outside of the building frame A.

In the construction crane of the present invention, during the loading and unloading operations of such equipment and the like, the support frame 20 which constitutes the crane part 1 drives the rack 13 and the driving gear 26 to mesh with each other along the mast 10. Since it can be moved up and down and freely moved to the target position and the telescopic boom 30 installed can be horizontally extended and contracted and raised and lowered, for example, depending on the state of the equipment to be carried in, it is necessary to lift it according to the taken-up height to the required floor of the building It is also possible to move the support frame 20 up and down to perform so-called on-site alignment. Of course, in order to perform stable loading and unloading operations, the fixing means 27 is operated to fix the support frame 20 to the mast 10, and the hoisting work can be performed safely even if the turning center deviates from the center of the mast 10. Can be done. The fixing of the mast 10 by the fixing means 27 can be fixed at any position by adopting the above-described clamping mechanism, and the fixing can be easily released by performing the reverse operation. This is convenient when positioning by freely moving. Further, when the supporting frame 20 is moved and stopped at a desired position and then the hoisting work is performed, it is always safe if the control mechanism is set in advance so that the fixing operation of the fixing means 27 operates first. Can do hoisting work.

A reduction motor mounted on the support frame 20
When the gear 26 is driven by 25, the crane unit 1 has a mast 10
Since it is configured to be able to ascend and descend along with, it is possible to ascend and descend while the equipment etc. is suspended by the telescopic boom 30 as described above, so even if an unexpected situation occurs during its movement,
The fall prevention device 29 is always interlocked with each other during movement, which provides safety to prevent a fall in advance.

[0020]

As described above, in the construction crane of the present invention, the crane part is configured to be movable up and down along the mast which is erected in the vicinity of the building, and the crane part is mast at an arbitrary position. Since it can be stopped and fixed and the hoisting work can be performed, it is possible to safely and surely carry in / out the equipment etc. into / from the required floor of the building under construction. Further, the mast can be supported by the support to the building frame and the crane part can be freely moved up and down.Therefore, the mast can be freely moved to the high position without any trouble even at the high lift or at the low position. It has the convenience of being able to move and hoist over a wide area.

[Brief description of drawings]

FIG. 1 is an overall front view of a construction crane according to the present invention, in which a telescopic boom is inserted into an intermediate floor of a building.

FIG. 2 is an enlarged front view of a main part of the construction crane of the present invention, in which a support part is partially omitted.

FIG. 3 is a plan view of FIG.

FIG. 4 is a right side view of FIG.

5A and 5B show an example of a fixing means for fixing the support frame to the mast, wherein FIG. 5A is a plan sectional view, and FIG. 5B is a bb view of FIG.

[Explanation of symbols]

 1 Crane Section 10 Mast 12 Guide Rail 13 Rack 15 Support 20 Support Frame 21 Mounting Board 22, 22 'Guide Roller 23 Side Guide Roller 25 Speed Reduction Motor 26 Drive Gear 27 Support Frame Fixing Means 29 Fall Prevention Device 30 Telescopic Boom 31 Mounting base 32 Swivel plate 33 Boom support 34 Hydraulic cylinder for ups and downs 35 Winding machine 36 Suspension rope 38 Suspension block

Claims (1)

[Claims] 1. A mast that is erected from a building and supported by a support, a support frame that is vertically movable along the mast, and a mast mounted on the support frame via a revolving structure. Including a hoist and telescopic boom,
A guide rail and a rack are provided along the side surface of the mast, and the support frame is guided by the guide rail of the mast and is movable up and down by driving a gear meshing with the rack. On the other hand, a construction crane, which is provided with a fixing means that can be fixed at an arbitrary position.