简述后张法的施工过程。
混凝土构件或结构制作时,在预应力筋的部位预先留出孔道,(1分)然后浇筑混凝土并进行养护,再将预应力筋穿入预留孔内;(1分)待混凝土到达设计规定强度后,张拉预应力筋并用锚具将其锚固在构件或结构端部,使其混凝土产生预压应力,(2分)最后进行孔道灌浆与封头。(2分)
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