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采用减压注浆法生产混凝土构件,是综合了压力注浆混凝土技术和混凝土真空吸水处理技术的最新工艺。其基本工艺方法是,在预先制做好的双层套模内放置好钢筋和填充粗骨料,然后将模板内部抽成一定真空,使模板内部处于负压状态,紧接着灌注砂浆,再进行真空吸水,最后在模板内通入蒸气进行养护,拆模即出产品。此法与现行混凝土成型工艺比较具有如下特点:(1) 由于采用负压真空技术,混凝土构件具有均匀性和高密实度,可广泛应用于生产各种形状复杂的建筑结构和混凝土预制构件。(2) 由于采用负压注浆和真空处理技术,水泥砂浆与混凝土进行特殊混合搅拌和注浆技术,以及封闭加热养护技术等,混凝土构件强度可提高40％左右。(3) 混凝土构件的质量有显著提高,养护3小时即可达到脱模强度,模板
The use of vacuum grouting method to produce concrete components is the latest process that combines the pressure grouted concrete technology and the vacuum absorption technology of concrete. The basic process method is to place a good reinforcement and fill coarse aggregate in a pre-made double-layer mold, and then pump the inside of the template into a certain vacuum so that the interior of the template is in a state of negative pressure, followed by pouring mortar, and then Vacuum suction, and finally in the form of steam into the template for maintenance, remove the mold that is the product. This method has the following characteristics compared with the current concrete forming process: (1) Due to the use of negative pressure vacuum technology, the concrete components have evenness and high density, and can be widely used in the production of various complex shapes of building structures and prefabricated concrete components. (2) Due to the use of negative pressure grouting and vacuum processing technology, special mixing and grouting techniques for cement mortar and concrete, and closed heating curing techniques, the strength of concrete components can be increased by about 40%. (3) The quality of concrete components has been significantly improved, and the strength of demoulding can be achieved after curing for 3 hours.