1975年在皖赣线和津浦复线施工中,我处二段先后在6座桥梁和4处翼墙上,通过3000多个炮眼的施工试验,初步掌握了用国产普通硝铵炸药对铁路桥涵工程中各种不同类型的构筑物进行控制爆破的规律。并初步总结出控制爆破法各个基本要素的关系式和确定药量的初步意见,安全地完成了2500立 In the construction of the Suining Line and the Jinpu Double Track in 1975, the second section of our office successively performed construction tests on more than 3,000 boreholes on six bridges and four wing walls, and preliminary mastered the use of domestic ordinary ammonium nitrate explosives for railway bridges and culverts. Various types of structures are used to control blasting. A preliminary summary of the relationship between the basic elements of the controlled blasting method and the preliminary determination of the amount of the drug was completed, and the 2500 level was safely completed.