高速铁路隧道钻爆法机械化施工关键技术和装备

Key Technologies and Equipment for Mechanized Drilling and Blasting Construction in High Speed Railway Tunnels

依托渝昆高速铁路(重庆—昆明)渝宜段缙云山隧道工程,探讨了机械化施工关键技术及装备。结果表明:改进后的三臂凿岩台车能够适应不同等级围岩和工法的转换;早强锚固剂和注浆锚杆植入工艺可快速施加预应力,使锚杆抗拔力明显提高,解决了软弱围岩支护难的问题;多功能拱架台车与“一长两中两短”拱架铰接式安装可明显增强结构抗弯刚度,减少吊装次数,提高拱架定位精度,缩短钢拱架安装和单次循环作业时间。经在渝昆高速铁路和西渝高速铁路中应用,本文提出的机械化施工技术及装备可优化施工流程,减少辅助设施的使用,降低超挖风险,显著提高施工效率和安全性。

Based on the Jinyun Mountain Tunnel project of the Chongqing-Kunming high speed railway Chongqing-Yibin section,this paper explored the key technologies and equipment for mechanized construction.The results show that the improved three arm rock drilling trolley can adapt to the conversion of different levels of surrounding rock and construction methods.The early strength anchoring agent and grouting anchor rod implantation process can quickly apply prestress,which could significantly improve the anchor rod’s pull-out resistance and solve the problem of difficult support for weak surrounding rock.The multifunctional arch frame trolley and the articulated installation of‘one long,two middle,and two short’arch frames can significantly enhance the bending stiffness of the structure,reduce the number of lifting operations,improve the positioning accuracy of the arch frame,and shorten the time for steel arch frame installation and single cycle operation.Through application in the Chongqing-Kunming high speed railway and the Xi’an-Chongqing high speed railway,the mechanized construction technology and equipment proposed in this article can optimize the construction process,reduce the use of auxiliary facilities,reduce the risk of over excavation,and significantly improve construction efficiency and safety.