Abrégé

The flexible roadway support frame Fig. 1 equipped with roof-bar arches(l) and sidewall arches (2) connected with each other by means of double-yoke stirrups with overlap (3, 4, 5) characterized in that each arch has a cut-out in the flanges located at the ends of those arches Fig 2.

Classes IPC  ?

• E21D 11/22 - Mâchoires ou autres moyens flexibles pour relier des éléments de cintre voisins, soit de façon rigide, soit de façon à permettre un glissement de parties de l'élément de cintre en cas de pression excessive