我单位在工程质量回访中发现多层建筑顶层砖墙与屋面梁之间常出现一条水平裂缝。这种裂缝产生的原因主要有以下两点。(?)框袈梁在支安模板时,跨度等于或大于4m都要按规定中间起拱,以保持梁底标高符合设计要求。实际上,仅凭梁本身混凝土和钢筋重量,术一定能全部抵消起 My unit in the quality of the return visit found that the top of the multi-storey brick roof and roof beams often appear a horizontal crack. The main reasons for this crack are the following two points. (?) Frame 袈 beams in the security template, the span of equal to or greater than 4m according to the provisions of the arch in the middle, in order to maintain the elevation of the beam bottom meet the design requirements. In fact, only the beam itself, concrete and steel weight, surgery will certainly be able to offset all