我单位施工的唐山市64号小区住宅楼为内浇外砌结构,房间轴线尺寸为3.3×4.8米.2.7×4.8米两种,地面为水泥砂浆地面,设计做法见图1。然而,1985年7月底以前竣工的第一期工程90%以上的地面出现了裂缝,裂 The residential building of No.64 residential area in Tangshan City constructed by our company is a pour-in external masonry structure. The dimensions of the room axis are 3.3×4.8 meters and 2.7×4.8 meters. The ground is cement mortar floor. The design practice is shown in Figure 1. However, more than 90% of the ground in the first phase of the project completed before the end of July 1985 had cracks and cracks.