摘要
在富水、松散、软弱破碎地层中进行隧道施工,注浆是加固地层和堵水的有效手段,大量的工程实践表明,如果采用分段前进式注浆方式,由于坍孔等因素的影响,当注浆加固长度为30m,前15m左右注浆效果较好,后15m左右效果较差,且需要反复钻注,施工效率低,成本高,因此提出了一种钻孔注浆一体化的技术,采用密封孔口方式进行钻杆后退式分段注浆,浆液从钻头排出,直接进入需要注浆的部位,实现了钻孔注浆的连续一体化作业,减少了工序转换时间,提高了注浆效率,改善了注浆效果。
Grouting is an effective method for strengthening stratum and sealing water during tunneling in water-rich,loose,soft and fractured strata.Many projects show that the strengthening length by stepped and onwards grouting method is 30m,as a result of the influence of grouting holes collapse and other factors,the grouting and.For the strengthened 30m,the grouting effect of the front 15m is well,but the latter 15m is poor.In addition,this grouting method has low construction efficiency and high cost and needs repeating grouting.Hence,an integrated technology of drilling and grouting is introduced in this paper.Retrograde and stepped grouting is realized by sealing grouting holes.The grout can discharge from the aiguilles and run into the area need grouting directly,so the integrated construction of drilling and grouting is achieved.This technology can reduce transition time among construction procedures,advance grouting efficiency and improve grouting effects.
出处
《隧道建设》
2010年第4期365-370,406,共7页
Tunnel Construction
关键词
隧道
钻孔
注浆
一体化施工技术
钻杆后退式分段注浆
tunnel
drilling
grouting
integrated construction technology
retrograde and stepped grouting
