1发展现状1.1“老三样”技术为公路事业作出了新的贡 献 60、70年代,以“老三样”——渣油路面、钻孔灌注桩、双曲拱桥为带头技术,为我国路面“黑色化”,桥梁“永久化”提供了技术保障,其范围之广,影响之深远,效益之显著都是空前的。1.2 新五项关键技术使公路交通跃上新台阶 1 Development Status 1.1 The “Third Generation” Technology Has Made New Contributions to Highway Business During the 1960s and 1970s, taking the “third generation” - residual oil pavement, bored piles and double curved arch bridges as the leading technologies, “Black”, the bridge “permanent” provides technical support, its scope is wide, far-reaching impact, the obvious benefits are unprecedented. 1.2 The new five key technologies have brought highway traffic to a new level