控制爆破法拆除拱形跨线桥

跨线人行天桥是一特殊的预应力拱形构筑物 ,用控制爆破法拆除。根据待爆破部分的结构和条件 ,具体设计布孔和装药结构。用防护棚和铺设湿草袋的方法阻挡飞石。用车道板和袋装土保护浅埋管线以及迎宾大道的路面。整个工程 ,包括搭建防护物、铺设车道板、装药爆破、清碴等 ,仅用 13h就全部完成。

DEMOLITION OF AN OVERHEAD-CROSSING ARCHED BRIDGE BY CONTROLLED BLASTING

The overhead crossing bridge,a special pre stressed arched construction,was demolished by controlled blasting method.According to the structure and conditions of the parts to be blasted,the concrete blasthole pattern and charging structure were worked out.The protection shed and covered wet matting were used for stopping of the flying rock.The shallow buried pipes and cables and the pavement of the Guest met Highway were protected by use of the lane safeguarding plates and packaged earth.The whole project including construction of protection matters,laying of the lane safeguarding plates,charging and blasting,cleaning of broken stones and others was completed for only 13 hours.