在现代各种建筑中,钢筋混凝土预制构件已获得广泛应用。但由于设计和施工等方面的原因,往往出现该预留的孔洞而未留、或已留的孔洞有偏差等现象,所以还要花很多人力和时间打孔,不但劳动强度大、效率低,而且影响工程进度。近年来,不少单位曾采用乙炔焰切割混凝土,但并不理想。最近我们试用了电弧切割混凝土的方法,效果很好,现简介如下。 In modern buildings, reinforced concrete precast elements have been widely used. However, due to the reasons of design and construction, there are often holes in the reserved holes that have not been left, or the holes that have been left are deviated, and so they have to spend a lot of manpower and time to punch holes. This is not only labor-intensive but also inefficient. And affect the progress of the project. In recent years, many units have used acetylene flame cutting concrete, but it is not ideal. Recently we tried the method of arc cutting concrete, and the effect is very good.