| 摘要 |
<p>The invention provides a method for furbishing or renovating large span overhead structures, for example the roofs of railway stations, or bridges and the like, and utilizes apparatus which comprises a plurality of runway beams suspended in spaced parallel disposition from the main ribs or framework of an overhead structure said beams spanning a plurality of said ribs or framework and being longitudinally displaceable relative thereto, and a work platform or platforms suspended from said runway beams and being displaceable therealong. Thus arranged, the overhead structure can be treated for substantially its entire length by alternately advancing the work platforms along the runway beams and the runway beams relative to the structure.</p> |
