| 摘要 |
PROBLEM TO BE SOLVED: To previously detect a contact of a member with a structure, and to prevent the contact when the member is gripped by a machine such as a crane on a narrow ground or the like. SOLUTION: The obstruction detecting control system is arranged near a bridge apart from a pile press-in and pull-out machine. Approach to the bridge of at least one of the pile press-in and pull-out machine and the member can be detected previously, The obstruction detecting control system has a detector outputting a detecting signal and a control section controlling a driving section for the machine so that the machine and the member are not brought into contact with the bridge when the detecting signal is output from the detector. Accordingly, even when the machine is operated near the bridge, the machine can be controlled so that the machine and the member used in the operation of the machine are not brought into contact with the bridge.
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