下套拱法加固旧石拱桥技术榆林市地处黄土高原沟壑地区,榆林公路管理局管养国省道干线里程达1343公里,且大部分修筑于上世纪70年代之前,道路结构物承载力普遍较低,不能适应现代化交通运输业大运量、大吨位发展的需求,出现了很多危桥、险桥。2000 Under the arch method to strengthen the old stone arch bridge technology Yulin City is located in the gully region of the Loess Plateau, Yulin Road Authority custody of the provincial highway trunk mileage of 1343 km, and most of them built in the 70s of last century ago, the bearing capacity of road structures is generally Lower, can not meet the needs of large-capacity and large-tonnage development of modern transportation industry, and many dangerous and dangerous bridges have emerged. 2000