| 摘要 |
The invention relates to a safety device constituted by an articulated beam composed of two bars 1, which are joined together by a double clevis 2, on which pressing flanks 5 slide. The positioning and the articulation of the sole plate (base) 11 of the cleves 10 which are articulated in the bars 1 confer on the shore (brace) the angular position and the optimum distance. The apparatus permits foundation underpinning, its temporary and localised removal, reducing thereby the risk of collapse of the preserved portions. <IMAGE>
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