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现浇板式混凝土结构由于表面系数大、散热快,在冬期施工中不易保温,且又多为悬臂、简支等结构,施工难度较大。过去我们主要采用在混凝土中掺附加剂的蓄热法施工;也曾采用甩筋留施工缝,待常温再浇筑混凝土及将现浇构件改为预制构件的施工措施,但这些方法均较复杂,且易造成隐患。因此,1982年我们开始进行现浇板式混凝土结构冬施电热褥养护。现介绍如下。一、施工方法电热褥规格为1260×1450mm,导线直径0.14～0.16mm,电压220V,电流0.34A,功率75W,电阻650Ω。
Cast-in-place concrete structure due to the surface coefficient of large, fast heat dissipation, in the winter construction is not easy to keep warm, and many more cantilever, simple support and other structures, the construction is more difficult. In the past, we mainly used the thermal storage method of adding additives to the concrete. We also used the retaining bars to leave the construction joints, and the construction measures for the concrete to be poured at room temperature and the change of cast-in-place components to prefabricated components were all complex. And easy to cause hidden dangers. Therefore, in 1982, we began to implement thermal protection for cast-in-place concrete structures in winter. The introduction is as follows. First, the construction method of electric heating specifications is 1260 × 1450mm, wire diameter 0.14 ~ 0.16mm, voltage 220V, current 0.34A, power 75W, resistance 650Ω.