| 摘要 |
<p>The installation comprises series (2) of main uprights secured to a certain number of concrete fillings and appropriate to support self-lifting brackets (39) which themselves carry working plate-forms (56, 57). The main upper uprights (21) are used as supporting elements for the shutter forms (9) and for secondary uprights (6) which are interleaved between the series of main uprights (2). The brackets (39) are made self-elevating by means of a stationary bracket (49) and of a movable bracket (50) displaced by a screw (53) motor (52), so that those brackets may successively bear on the different main uprights. The length of the working platforms (56, 57) may automatically increase or decrease as a function of the variable gaps between the two neighbouring brackets when making surfaces (1) with a variable curvature radius. </p> |
