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Toussaint-Heintzmann arch

A channel-type, steel-arch support consisting of three elements or sections set close to the face of a tunnel. These elements overlap and yield by sliding one upon the other under the constraint of bolted clamps. The center or crown element is usually foreset to give temporary protection until the complete arch is erected.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
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