E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 9/06 (2006.01) E21D 11/15 (2006.01) E21D 11/40 (2006.01)
Patent
CA 2619880
A primary support for a tunnel roof comprising elongated lagging members which are "extruded" from tubes forming a shield for a tunnel boring machine. The lagging is inserted into the tubes at different times so as to avoid having the ends of adjacent lagging members coincide. As the tunneling machine progresses in the direction of boring, the lagging members emerge from the shield tubes to form a primary tunnel roof lining. Ring beams or arc beams may be installed as required by means of rock bolts or other fastening means.
Soutenement primaire pour un toit de tunnel comprenant des éléments de garnissage de forme allongée qui sont « extrudés » à partir de tubes formant un bouclier de protection pour une machine de forage de tunnel. Le garnissage est inséré dans les tubes à différents moments de manière à éviter que les extrémités des éléments de garnissage adjacents coïncident. € mesure que le tunnelier progresse dans la direction de forage, les éléments de garnissage émergent des tubes de protection pour former une garniture de toit de tunnel primaire. Des poutres annulaires ou des poutres cintrées peuvent être installées comme requis au moyen de boulons d'ancrage ou d'autres moyens de fixation.
Mcnally Christopher
Mcnally Michael P.
C. & M. Mcnally Engineering Corporation
Oldham Edward H.
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