复杂环境下桥梁基坑浅孔控制爆破技术

结合紧邻既有侯西铁路新黄河特大桥基坑开挖工程施工实践,介绍了采用控制爆破技术以降低爆破振动速度和控制爆破飞石为目标的复杂环境桥梁基坑开挖技术,总结了物理隔离防护、地面防护及孔口防护等立体多层次复合防护技术,施工实践取得了良好的效果,为类似工程提供了借鉴。

Technique of Shallow Hole Controlled Blasting of Bridge Foundation Pit Under Complicated Environment

Based on the practical construction of the foundation pit excavation of the New Yellow River Extra Large Bridge next to Houma-Xi＇ an Railway, the technique of bridge foundation pit excavation under complicated environment are introduced. This technique targets at lowering the blast vibration speed and controlling the blasting fly-rocks. The multilevel composite protection techniques such as physical isolation protection, ground protection and porthole protection are concluded. The construction produces a good effect and can be referred to by similar projects.