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大中跨度桥梁上部多采用预应力空心板梁、预应力空心箱梁结构,若预应力筋为曲线形则采用后张法施工。现就后张法预应力空心板梁施工工艺介绍如下。1原材料的要求①砂:要求质地坚硬、颗粒洁净、耐久性好,且不得包含团
Large and medium-span bridges in the upper use of prestressed hollow slab, prestressed hollow box girder structure, if the prestressed tendons for the curved shape of the post-tension method construction. Now on the post-tensioned prestressed hollow slab beam construction technology are as follows. 1 requirements of raw materials ① sand: the requirements of hard texture, clean particles, good durability, and may not contain the group