民用建筑窗过梁上设置遮阳板,施工时费工、耗模板。因此,施工单位曾将现浇改为预制。在现浇窗过梁前,把预制平板放在窗洞顶上,用托板顶撑固定,然后在其上浇捣圈梁。但圈梁底部主筋通过受到板的阻碍,还须改低箍筋高度。若先浇过梁,后放预制板,将遮阳板放到窗过梁顶面,这 Sun visors are installed on the lintel of the civil building windows. The construction work involves the use of stencils. Therefore, the construction unit changed the cast-in-place to prefabrication. Before the cast-in-place window lintel, the prefabricated plate is placed on the top of the window hole, fixed with a pallet top support, and then the sill beam is poured on it. However, the main rib at the bottom of the ring beam is hindered by the plate, and the stirrup height must be reduced. If the beam is poured first, then the prefabricated panel is placed and the sun visor is placed on the top surface of the window lintel.