四川省各地基本建设单位发扬“干打垒”精神,建成了大量的“干打垒”建筑。其中,连砂石混凝土砌块(即天然级配原槽砂夹卵石加入少量水泥和石灰制成的低标号砌块)建筑近年来有了很大的发展。通过实际使用,群众反映较好。四川绵竹四○一信箱,四川省建工局建筑科学研究所、四川省建筑勘测设计院等单位的科研、设计人员深 The capital construction units in various parts of Sichuan Province have carried forward the spirit of “struggling with hardships” and built a large number of “dry strikes” buildings. Among them, the construction of sand-concrete-concrete blocks (ie, low-grade blocks made of natural gradation of the original tank sand with a small amount of cement and lime) has made great progress in recent years. Through actual use, the masses have reported better. Mianzhu 401 letter box in Sichuan, scientific research and design staff of Sichuan Institute of Building and Construction, Building Survey and Design Institute of Sichuan Province, and other units