PROBLEM TO BE SOLVED: To reduce cost by conducting operation without road regulation in the maintenance inspection operation of a road-structure bridge-steel I-girder.;SOLUTION: The bridge-steel I-girder maintenance inspection device has a traveling means having a suspension means suspended from a bridge-steel I-girder lower flange and traveling by remote control, a stepped riding-across means riding across on the stepped section of a joint section for the lower flange by receiving the detecting signal of a sensor detecting the joint section, a road-widening adjusting means adjusting the width of left-right suspending sections in the arbitrary width of the lower flange, a pushing-up means pushing up the lower flange, a fall preventive means, an observing means having a mounting means for a jig for maintenance inspection at the front end of a 4-shaft operating arm being freely rotated by remote control, a monitor means monitoring a front obstruction by remote control, a transmission means transmitting a maintenance inspection result and a reception means for remote control.;COPYRIGHT: (C)2001,JPO
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