一、热养护改造问题的提出对于离心混凝土管桩、电杆这一类长管状的混凝土制品,不少工厂是采用内通蒸汽的热养方式。这种开放式的蒸养方式设施简单、投产容易,但存在下述问题: 1.要散失大部分蒸汽,当混凝土管桩内壁温度上升到接近或等于蒸汽流的温度时,蒸汽的凝结放热效应还要下降以至停顿下来。所以,当以同样压力的蒸汽自始至终连续供汽热养时,后期的蒸汽效益就将更低。又因钢模外侧没有保温层,也要散热。所以,总的说来,这种养护的蒸汽热能利用率是很低的。 First, the issue of thermal conservation reform For centrifugal concrete pipe piles, poles, such as long tubular concrete products, many factories are using internal steam through the thermal method. This kind of open steam curing method is simple and easy to put into operation, but has the following problems: 1. To dissipate most of the steam, when the temperature of the inner wall of the concrete pile rises to a temperature close to or equal to the steam flow, the condensation heat release effect of steam It will also drop and stop. Therefore, the steam efficiency in the later period will be even lower when the steam with the same pressure is continuously steam-heated. Because there is no insulation on the outside of the steel mold, heat is also required. Therefore, on the whole, the utilization rate of this steam heating energy is very low.