在美国亚拉巴马州的一座医院建设中,地上6 m是拱门开口部,开口部周围墙体的厚度从20cm渐增至51 cm,原定采用传统方法施工。但由于开口部周围墙体的配筋较密,振捣困难,钢筋保护层厚度外侧为38mm,内侧19 mm,很难插入振捣棒,而且还要求浇注出平滑的表面装修, In the construction of a hospital in Alabama, USA, 6 m above the ground is the arch opening, and the thickness of the wall around the opening gradually increases from 20 cm to 51 cm. It was originally planned to use conventional methods. However, due to the dense reinforcement around the wall of the opening, it is difficult to vibrate. The thickness of the protective layer of the steel is 38mm on the outside and 19mm on the inside. It is difficult to insert the vibrator, and a smooth surface decoration is required to be poured.