旧工业厂房墙上开大门洞探讨

On How to Open the Big Entry in a Wall ofthe Old Workshop

旧厂房的墙上开设大门，在施工中应先做混凝土基础、再施工柱和托梁，待混凝土达到设计强度后，最后拆墙。

To open a big entry in a wall of the old workshop, one should firstly lay the concrete foundation, then construct the first column and the wall-holding column,and, after the concrete achieving the design intensity, finally open the wall.