JP2004224514A - Jib crane anti-collision method when stopping in strong wind - Google Patents

Abstract

[PROBLEMS] When a jib crane in which a plurality of work areas are overlapped and arranged to suspend work due to a strong wind such as a typhoon or the like, a problem that a large wind pressure due to a strong wind acts on the jib crane and a problem that the jib of the jib crane collide with each other. Prevent by a simple method.
Kind Code: A1 A method for preventing collision of a jib crane, in which a plurality of work areas of a jib are arranged in a plurality of overlapping times during a strong wind stop, wherein a turning drive device of a jib crane serving as a master unit has a jib. Of the jib crane 1 of the parent machine, the swing position detection signal 15a of the swivel position detector 13a provided in the jib crane 1 of the parent machine is input to another jib crane 2 serving as a child machine, and the swing drive device 7b of the jib crane 2 of the child machine is used as a master. By controlling based on the turning position detection signal 15a of the turning position detector 13a of the jib crane 1 of the machine, the jib 8b of the jib crane 2 of the slave machine is turned to a position where it does not collide with the jib 8a of the jib crane 1 of the master machine.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a problem that when a jib crane in which a plurality of work areas are overlapped and arranged is suspended due to a strong wind such as a typhoon or the like, a large wind pressure due to a strong wind acts on the jib crane and a problem that the jib of the jib crane collide with each other. The present invention relates to a method for preventing a jib crane from colliding during a strong wind stop, in which a simple method is used to prevent the collision.
[0002]
[Prior art]
FIG. 4 shows a climbing crane for building construction as an example of a jib crane. Jib cranes 1 and 2 are arranged at two places in a building 3. The jib cranes 1 and 2 have a crane mast 4 fixed at a position separated from the building 3, a crane body 6 is attached to the crane mast 4 via a climbing device 5, and the crane body 6 is moved by the climbing operation of the climbing device 5. You can move up and down.
[0003]
The crane main body 6 is configured to be able to pivot around the crane mast 4 by pivoting driving devices 7a and 7b having pivoting rings (not shown) provided above the climbing device 5, respectively. It is provided undulatingly. Reference numeral 9 denotes a power source guided from the ground to the upper part of the building 3, and the power source 9 is connected to the turning drive devices 7a and 7b by a power source line 10. By operating a controller (not shown) provided in the operation room 11, the crane main body 6 is turned by the turning drive devices 7 a and 7 b and the jibs 8 a and 8 b are raised and lowered, and the load by the hanging ropes 12 is carried out. Lifting, hanging and moving are performed.
[0004]
Each of the turning rings of the turning driving devices 7a and 7b is provided with turning position detectors 13a and 13b, such as rotary encoders, based on turning position detection signals detected by the turning position detectors 13a and 13b. Thus, the turning position of each crane body 6 is controlled.
[0005]
In the jib cranes 1 and 2, materials such as steel frames on the ground are lifted to the upper part of the building 3 by the hoisting ropes 12 to construct the upper story of the building 3, and then pieces are added to the upper part of the crane mast 4, and then the climbing device The building 3 is constructed by repeating the operation of raising the jib cranes 1 and 2 along the crane mast 4 by 5.
[0006]
At the time of building the building 3, two jib cranes 1 and 2 may be installed as shown in FIG. 4 or more jib cranes may be provided. In order to enable cargo handling work, the work areas are arranged so as to overlap each other. FIG. 5 is a plan view of FIG. 4, and the work range A when the jibs 8a and 8b of the jib cranes 1 and 2 turn at the maximum radius R has an overlapping portion B overlapping each other.
[0007]
Therefore, during normal cargo handling work of the jib cranes 1 and 2, the turning of the crane body 6 is controlled so that the jib 8a and 8b do not collide with each other.
[0008]
In the jib cranes 1 and 2, when a strong wind such as a typhoon or the like is generated, it is conceivable that the jib cranes 1 and 2 fall down due to a large force acting on the wind pressure. For this reason, at the time of suspension due to strong wind, the driving of the swing drive devices 7a and 7b of the jib cranes 1 and 2 is released, and the jib 8a and 8b are freely swung so as to be in a blow-off state. Is prevented from working.
[0009]
However, even if each jib 8a, 8b of the jib cranes 1, 2 is freely swiveled, the jib 8a, 8b is not always reliably blown simultaneously in the same direction. In the overlapping portion B, there was a problem that the gibs 8a and 8b collided with each other.
[0010]
Therefore, in order to prevent the problem of collision between the jib 8a and 8b, conventionally, when a typhoon is predicted to pass, the climbing device 5 of one jib crane 2 is operated as shown in FIG. The main body 6 is lowered, and the height is adjusted so that the jib 8b of one jib crane 2 does not collide with the jib 8a of the other jib crane 1.
[0011]
However, the operation of lowering the crane body 6 by the climbing device 5 is very difficult and time-consuming, and therefore, the crane operation must be stopped before the typhoon approaches and the operation of lowering the crane body 6 must be performed. In addition, after the typhoon passes, it is necessary to raise the crane body 6 again by the climbing device 5. Therefore, there is a problem that the downtime of the jib cranes 1 and 2 becomes longer due to the operation of raising and lowering the crane main body 6, and the construction period of the building 3 is extended.
[0012]
On the other hand, in a jib crane in which the working ranges are arranged in an overlapping manner as described above, in order to prevent the jib from colliding with each other due to turning during normal cargo handling work, a large number of working ranges are set within the maximum working range of each jib. It is divided into unit subsections, each unit subsection is made to correspond to each pit of the computer memory map for crane operation control, and the overlapping work range is set as a collision prevention control range, and the unit subsections within the control range are controlled. Stores as a range map, detects the position of the jib, and when it enters the above-mentioned restricted range, informs it to the computer of the other jib crane and prevents both jib cranes from entering the above-mentioned restricted range. (See, for example, Patent Document 1).
[0013]
[Patent Document 1]
JP 06-144787 A
[Problems to be solved by the invention]
However, in the above-mentioned Patent Literature 1, when the jib enters the regulation range during the normal work in which each jib crane is performing cargo handling work, the jib is communicated to the computer of the other crane and the regulation is performed. The jib crane is controlled so that the jib of both cranes does not enter the area in an overlapping manner.When the jib crane is at rest, strong wind pressure due to strong wind is prevented from acting on the jib crane, and at the same time, the jib collides with each other. It is not intended to prevent it.
[0015]
Therefore, in order to apply the thing described in Patent Document 1 to prevent the jib from colliding with each other in the jib crane during the stoppage of the strong wind, it is necessary to detect the wind direction and turn the jib of each jib crane according to the wind direction. Must be controlled, and there is a problem that the configuration and the control are troublesome.
[0016]
Furthermore, a power failure accident due to a typhoon is conceivable. However, when a power failure occurs, the jib crane cannot be controlled to turn, so that it is impossible to prevent the collision of the jib.
[0017]
The present invention has been made to solve the above-described problem, and has a problem in that when a jib crane in which a plurality of work areas are arranged so as to overlap with each other suspends work due to a strong wind such as a typhoon, a large wind pressure due to the strong wind acts on the jib crane. Another object of the present invention is to provide a method for preventing a jib crane from colliding with each other in a simple manner, which prevents the jib from colliding with each other.
[0018]
[Means for Solving the Problems]
The invention described in claim 1 is a collision prevention method for a jib crane during a strong wind stop for preventing the jib from colliding with each other when the jib crane in which a plurality of work areas of the jib are arranged so as to overlap each other is stopped. The turning drive of one jib crane as a master unit allows the jib to turn freely, and inputs a turning position detection signal of a turning position detector provided in the jib crane of the master unit to another jib crane as a slave unit. Controlling the swing drive device of the jib crane based on the swing position detection signal of the swing position detector of the master jib crane to swing the jib of the slave jib crane to a position where it does not collide with the jib of the master jib crane. A method for preventing a collision of a jib crane during a strong wind stop, which is characterized in that:
[0019]
The invention according to claim 2 is characterized in that an auxiliary power supply is provided to the swing drive device of the jib crane of the slave unit, and the jib crane of the slave unit can be swiveled by the auxiliary power source during a power failure. 1. A method for preventing a jib crane from colliding during a strong wind stop according to item 1.
[0020]
The invention according to claim 3 relates to the method for preventing collision of a jib crane during a strong wind stop according to claim 1 or 2, wherein the jib crane is a climbing crane for building construction.
[0021]
According to the present invention, the following operation is performed.
[0022]
When a strong wind is applied, the turning drive of one jib crane as a master unit is free to rotate the jib in a blowing state, and a turning position detection signal of a turning position detector provided in the jib crane of the master unit is used as a slave unit. The jib crane of the parent machine controls the drive of the jib crane of the child machine based on the turning position detection signal of the jib crane of the parent machine. To prevent the jib crane from being in the state of drifting wind, so that large wind pressure can be prevented from acting on the jib crane.The jib of the slave jib crane collides with the jib of the parent jib crane. It can be reliably prevented by a simple method.
[0023]
An auxiliary power supply is provided in the swing drive of the jib crane of the slave unit, and the jib of the slave jib crane can be turned by the auxiliary power supply at the time of power failure, so that the jib collision is reliably prevented even if a power failure occurs To secure the safety of the jib crane.
[0024]
If the jib crane is a climbing crane for building construction, it will not be necessary to change the height of the crane body in order to prevent the conventional jib from colliding with each other. Significant shortening can be achieved.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention when applied to a jib crane provided in the building shown in FIG. 4. In FIG. 1, the same parts as those in FIG.
[0026]
In FIG. 1, one of a plurality of jib cranes 1 and 2 composed of climbing cranes used for construction of a building 3 has one jib crane 1 as a main unit and the other jib crane 2 as a sub unit. The turning drive 7a of the jib crane 1 of the machine can switch the jib 8a to a free turning state.
[0027]
Further, as shown in FIGS. 1 and 2, the control device 14 provided in the jib crane 2 of the child machine receives a turning position detection signal 15a of the turning position detector 13a provided in the jib crane 1 of the parent machine, The turning position detection signal 15b of the turning position detector 13b provided in the jib crane 2 of the machine is input.
[0028]
The control device 14 outputs a control signal 16 based on the turning position detection signal 15a detected by the turning position detector 13a of the jib crane 1 of the master unit to the turning drive device 7b of the jib crane 2 of the slave unit, The crane main body 6 of the jib crane 2 of the slave unit is controlled so that the jib 8b of the jib crane 2 of the machine always does not collide with the jib 8a of the jib crane 1 of the master unit.
[0029]
Further, the jib crane 2 of the slave unit is provided with an auxiliary power source 18 such as a generator which is provided with a switching device 17 as shown in FIG. The electric power from the auxiliary power supply 18 can be immediately supplied to the turning drive 7b of the jib crane 2 as the slave unit.
[0030]
Next, the operation of the present invention will be described with reference to the control flowcharts of FIGS.
[0031]
The jib crane 1 as the master machine and the jib crane 2 as the slave machine operate the swing driving devices 7a and 7b by the controllers provided in the respective cargo handling operations to control the swing of the crane body 6. Since the jibs 8a and 8b may collide with each other during the normal crane operation, the jibs 8a and 8b are prevented from colliding with each other by the method described in Patent Document 1 or another method. .
[0032]
When the typhoon approach information S1 is received, the cargo handling work by the jib cranes 1 and 2 is stopped, and the turning drive 7a of the jib crane 1 as the parent machine sets the jib 8a to the free turning S2 state. Further, an operation S3 of operating the switch 17 to switch the power supply to the turning drive device 7a of the jib crane 2 of the slave unit from the power supply 9 to the power supply by the auxiliary power supply 18 and turning it on is performed. Subsequently, by manually controlling the turning drive device 7b using the auxiliary power supply 18, the initial setting S4 for adjusting the direction of the jib 8b of the jib crane 2 of the slave unit to the direction of the jib 8a of the jib crane 1 of the master unit is performed.
[0033]
Next, a reset S5 is performed to correct the origin of the turning position detection signals 15a and 15b from the turning position detectors 13a and 13b input to the control device 14.
[0034]
The control device 14 performs reading S6 of the turning position detection signals 15a and 15b from the turning position detectors 13a and 13b, and compares the turning position detection signals 15a and 15b to calculate an angle difference S7. It is determined whether the angle difference is larger or smaller than a predetermined value (for example, 10 °) in S8, and when a deviation equal to or more than a predetermined angle difference occurs, the jib crane 2 of the slave unit is adjusted to the direction of the jib 8a of the jib crane 1 of the master unit. The jib 8b is turned S9 by a predetermined angle (for example, 10 °).
[0035]
By the above control, the jib 8b of the jib crane 1 of the slave unit always follows in the same direction as the direction of the jib 8a of the jib crane 1 of the master unit. The problem of collision at the overlapping portion B of the range A is reliably prevented.
[0036]
When the cancellation S10 of the typhoon countermeasure is input, the operation S11 of switching the auxiliary power supply 18 to the normal power supply 9 is performed, and the swing drive devices 7a and 7b of the jib cranes 1 and 2 are controlled by the controller to perform swing drive control during normal work. Can be switched.
[0037]
As described above, according to the collision prevention method for a jib crane according to the present invention, when a strong wind is applied, the turning drive device 7a of one jib crane 1 serving as a master unit makes the turning of the jib 8a free and in a blowing state when a strong wind acts. In addition, a turning position detection signal 15a of a turning position detector 13a provided in the jib crane 1 of the parent machine is input to another jib crane 2 serving as a child machine, and the drive of the turning drive device 7b of the jib crane 2 of the child machine is driven by the master. By controlling based on the turning position detection signal 15a of the jib crane 1 of the machine, the direction of the jib 8b of the jib crane 2 of the child machine is adjusted to the direction of the jib 8a of the jib crane 1 of the master machine. Can be prevented from exerting a large wind pressure on the jib cranes 1 and 2 due to the wind-down state, and the jib 8b of the jib crane 2 of the slave unit can be prevented. It is possible to reliably prevent the problems impacting the jib 8a of the jib crane 1 of the master unit by a simple method.
[0038]
Also, the auxiliary drive 18 is provided in the turning drive 7b of the jib crane 2 of the slave unit, and the jib 8b of the jib crane 2 of the slave unit can be turned by the auxiliary power source 18 at the time of a power failure. Also, the collision of the jib 8a, 8b can be reliably prevented, and the safety of the jib cranes 1, 2 can be secured.
[0039]
When the jib cranes 1 and 2 are climbing cranes for building construction, it is unnecessary to change the height of the crane main body 6 so that the conventional jib 8a and 8b do not collide with each other. By shortening the suspension period, the construction period can be significantly reduced.
[0040]
It should be noted that the present invention is not limited to the above embodiment, but may be applied to various jib cranes, and may be variously modified without departing from the gist of the present invention.
[0041]
【The invention's effect】
As described above, according to the present invention, when a strong wind acts, the turning drive of one jib crane serving as the master unit can freely turn the jib in the blow-off state, and the turning position detector provided in the jib crane of the master unit turns. By inputting the position detection signal to another jib crane serving as a slave unit and controlling the driving of the swing drive device of the jib crane of the slave unit based on the swing position detection signal of the jib crane of the master unit, the jib of the jib crane of the slave unit is controlled. Of the jib crane of the parent machine is adjusted to the direction of the jib of the parent machine, so that it is possible to prevent a large wind pressure from acting on the jib crane when the jib crane is in a drifting state, and that the jib of the sub machine jib crane is used as the master machine. This has the effect that the problem of collision with the jib of the jib crane can be reliably prevented by a simple method.
[0042]
An auxiliary power supply is provided in the swing drive of the jib crane of the slave unit, and the jib of the slave jib crane can be turned by the auxiliary power supply at the time of power failure, so that even if a power failure occurs, the collision of the jib is reliably prevented This has the effect of ensuring the safety of the jib crane.
[0043]
If the jib crane is a climbing crane for building construction, it is not necessary to change the height of the crane body so that the conventional jib does not collide with each other. This has the effect of significantly reducing the time.
[Brief description of the drawings]
FIG. 1 is a side view of a jib crane showing an example of a form of a collision prevention method of the present invention.
FIG. 2 is a block diagram showing a method of controlling turning of a jib crane of the slave unit in FIG.
FIG. 3 is a control flowchart of the collision prevention method of FIG. 1;
FIG. 4 is a side view showing an example of a conventional jib crane.
FIG. 5 is a plan view of the jib crane of FIG. 4;
FIG. 6 is a side view showing a conventional method in which the crane body of one jib crane is lowered to adjust the jib to a height that does not collide with the jib of the other jib crane.
[Explanation of symbols]
1, 2 Jib cranes 7a, 7b Swivel drive 8a, 8b Jib 13a, 13b Swivel position detection signal 18 Auxiliary power source A Working range B Overlap

Claims (3)

A jib crane for preventing a jib from colliding with each other when the jib crane in which a plurality of jib work areas are overlapped and arranged in a strong wind is provided. The turning drive device allows the jib to turn freely, inputs a turning position detection signal of a turning position detector provided in the parent jib crane to another jib crane serving as a slave unit, and sets the jib crane turning drive device for the slave unit to the parent jib crane. The jib crane of the slave unit is turned to a position where it does not collide with the jib of the jib crane of the parent machine by controlling based on the turning position detection signal of the turning position detector of the jib crane of the machine at the time of strong wind stop of the jib crane Anti-collision method. 2. The jib crane according to claim 1, wherein an auxiliary power source is provided in the swing drive device of the jib crane of the slave unit, and the jib crane of the slave unit is swivel-driven by the auxiliary power source during a power failure. Anti-collision method. The method of claim 1, wherein the jib crane is a climbing crane for building construction.

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