JP2749499B2 - How to pause the transport trolley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for temporarily stopping a transport trolley for transporting a load lifted by a crane to a load lifting point.

[0002]

2. Description of the Related Art Heretofore, the following methods have been used for dam construction.

[0003] That is, concrete transport trucks (hereinafter, referred to as
The concrete loaded on the carriage is received by a concrete bucket attached to the tip of a wire suspended from the boom of the tower crane. After the concrete bucket full of concrete is lifted and the boom is turned, the elevation angle of the boom is adjusted and the concrete bucket is moved to a position directly above the casting position. After that, the concrete bucket is lowered and concrete is poured.

In the meantime, it is expected that the transport trolley will load concrete from a concrete kneading plant via a concrete hopper, travel on a bunker line, and land an empty concrete bucket suspended by a tower crane. It moves to a point a predetermined distance before the point where the empty concrete bucket landed last time, and waits until the empty concrete bucket landed. And
After the empty concrete bucket has landed, the transport vehicle moves forward at low speed and approaches the concrete bucket.

[0005] In this way, the cycle time of concrete placing is shortened by previously stopping the transport trolley at a temporary stop point a predetermined distance before the predicted landing point of the empty concrete bucket.

[0006]

However, the above-mentioned conventional method of temporarily stopping a transport truck in concrete placing using a tower crane has the following problems.

[0007] That is, the pouring position of concrete constantly changes. Therefore, when the concrete bucket loaded with concrete is lowered, the elevation angle and the turning angle of the boom of the tower crane also change each time, and the empty concrete bucket does not always return to the same position. Therefore, as described above, when the point at which the empty concrete bucket landed last time is set as the predicted landing point of the next empty concrete bucket, the actual landing point deviates greatly from the predicted landing point. Occurs.

[0008] In this case, the distance from the temporary stop point where the transport vehicle is waiting to the landing point of the empty concrete bucket becomes longer, so that the time required for the transport vehicle to re-forward also becomes longer. As a result, the operator of the tower crane has to uselessly spend time from landing the empty concrete bucket until the truck arrives at the concrete bucket, and there is still room for reduction in the concrete casting cycle time. Is left behind.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of temporarily stopping a transport vehicle, which can further reduce the cycle time of lifting and lowering a load by a crane.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a method of temporarily stopping a carrier truck according to the present invention comprises loading a load that is lifted and moved horizontally by a crane having a boom that can be raised and turned. A method for temporarily stopping a transport vehicle at a stop point that is a predetermined distance before a predicted load lifting point of the next package, wherein the boom is used when the preceding load is landed at the destination by the crane. The following luggage lifting prediction point is calculated by a predetermined procedure based on the final elevation angle of the boom and the length of the boom, and the crane boom turns while maintaining the elevation angle to move to the next luggage lifting point. Prior to returning, the transport trolley loaded with the next luggage is moved in advance from the calculated predicted next luggage lifting point to the stop point before the predetermined distance. It is characterized by temporarily stopping Te.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is an explanatory view of dam construction using a tower crane to which the method of temporarily stopping a transport vehicle in this embodiment is applied. Hereinafter, a method of temporarily stopping a transport vehicle will be described with reference to FIG. 1 by taking dam construction using a tower crane as an example.

First, concrete casting operation is performed by operating the tower crane 1 and the transfer car 3 as a transport vehicle as follows.

That is, the operator of the tower crane 1 hoists the wire 4 in accordance with an instruction from the cab 8 provided at the top of the tower 6 and lifts the concrete bucket 5 loaded with concrete. After that, the tip of the boom 2 is positioned above the working place of the dam 9 by changing the elevation angle α of the boom 2 while turning the boom 2.
Then, while lowering the wire 4, the elevation angle α of the boom 2
The concrete bucket 5 is landed on the intended work site by adjusting the angle of rotation and the turning angle.

In this way, the concrete in the concrete bucket 5 transported to the work site of the dam 9 is poured.

In the meantime, the transfer car 3 moves toward the concrete kneading plant 12 on the bunker line 13 on which the track is laid, and loads the concrete kneaded in the concrete kneading plant 12 from the concrete hopper 11. Then, the elevation angle (hereinafter, referred to as a final elevation angle) α ′ of the boom 2 at the time of landing of the tower crane 1 that has finished landing the concrete bucket 5 on the work site of the dam 9 is captured by a radio signal and mounted. From the final elevation angle α 'and the length of the boom 2 by the microcomputer, the predicted landing point of the next empty concrete bucket
The distance from the standing position of the tower 6 (that is, the next concrete lifting predicted point) (hereinafter, referred to as a landing distance) is calculated.

Further, the intersection of an arc having the radius of the landing distance centered on the standing position of the tower 6 and a line segment extending from the center in the direction of a predetermined concrete loading location is determined. The obtained intersection is set as a predicted landing point of the empty concrete bucket 5.

When the loading of concrete is completed while doing so, the transfer car 3 moves on the bunker line 13 toward the predicted landing point of the empty concrete bucket 5 obtained above. Then, the vehicle temporarily stops at a stop point a predetermined distance before the landing prediction point and waits. The predetermined distance is a minimum necessary distance set from the viewpoint of safety and the like, and is stored in advance in a memory of the microcomputer.

On the other hand, the operator of the tower crane 1
When the concrete bucket 5 becomes empty, the wire 4 is wound up without moving the boom 2, and the empty concrete bucket 5 is lifted, and the boom 2 is turned while maintaining the final elevation angle α '. Then, the boom 2 is turned in the predetermined direction. After that, the wire 4 is rewound and the empty concrete bucket 5 is lowered.

At this time, since the transfer car 3 has moved to a position a predetermined distance before the predicted landing point of the empty concrete bucket 5 based on the final elevation angle α ′ and the length of the boom 2, Concrete bucket 5
Will land on a point approximately away from the transfer car 3 by the predetermined distance. That is, the distance between the temporary stop point of the transfer car 3 and the landing point of the empty concrete bucket 5 can be reduced to the minimum required distance.

Therefore, the transfer car 3 only needs to move the above-mentioned predetermined distance, and the rerun time of the transfer car 3 can be shortened to a necessary minimum, so that the concrete casting cycle time can be further shortened.

As described above, in the present embodiment, the transfer car 3 loaded with concrete is used to place the empty concrete bucket 5 on the tower crane 1 based on the final elevation angle α 'and the boom length of the boom 2. The user moves to the temporary stop point a predetermined distance before the predicted point and pauses. On the other hand, when the concrete bucket 5 becomes empty, the tower crane 1
Is turned while maintaining the final elevation angle α ′ so as to face a predetermined concrete loading location.

Therefore, the transfer car 3 can be temporarily stopped at a required minimum distance from the actual landing point of the empty concrete bucket 5, so that the rerun time can be shortened and concrete transfer can be performed. The cycle time can be further reduced.

The above embodiment describes a case where the method for temporarily stopping a transport vehicle according to the present invention is applied to dam construction using a tower crane. It is needless to say that the present invention can be applied to other operations of lifting and lowering a load using a crane.

[0025]

As is apparent from the above description, the method for temporarily stopping a transport vehicle according to the present invention is characterized in that the final elevation angle of the boom and the length of the boom when the previous load is landed at the destination by the crane. The next luggage lifting predicted point is calculated based on the above, and the carriage loaded with the next luggage is previously moved to a temporary stop point a predetermined distance before the calculated next luggage lifting predicted point, and temporarily stopped. When the boom of the crane in which the previous luggage has landed at the destination is swung while maintaining the final elevation angle, the transport vehicle can be temporarily stopped at a position closer to the actual next luggage lifting point. Therefore, according to the present invention, it is possible to further reduce the cycle time of lifting and lowering the load by the crane.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of dam construction using a tower crane to which a method for temporarily stopping a transport vehicle according to the present invention is applied.

[Explanation of symbols]

1 ... tower crane, 2 ... boom, 3 ...
Transfer car, 4 ... Wire, 5 ... Concrete bucket, 6 ... Tower.

Claims (1)

(57) [Claims] 1. A carriage loaded with a load that is lifted and moved horizontally by a crane having a boom that can be turned up and down is temporarily stopped at a stop point that is a predetermined distance before a predicted load lifting point next time. A method for temporarily stopping a transport trolley, wherein the next load is moved in a predetermined procedure based on a final elevation angle of the boom and a length of the boom when the previous load is landed at a destination by the crane. A predicted lifting point is calculated, and before the crane's boom turns while maintaining the final elevation angle and returns to the next load lifting point, the transport vehicle loaded with the next load is moved to the next calculated load position. A method of temporarily stopping a transport trolley, wherein the transporting vehicle is moved in advance from a predicted luggage lifting point to a temporary stop point before the predetermined distance and temporarily stopped.