地下连续墙硬岩成槽的钻铣组合工法探讨

Combination of drilling and milling for underground diaphragm wall trench construction in hard rock

介绍了双轮铣槽机的应用背景以及工作原理,针对双轮铣在地下连续墙硬岩成槽过程中出现的问题,分析了现阶段对纯铣法认识的误区以及硬岩工况采用纯铣法的局限性,硬岩工况下采用纯铣施工并不能充分发挥双轮铣这种设备的技术优势,提出了一种应用于硬岩成槽的钻铣组合工法,分析了这种组合作业工法的优点,并从引孔方法选择、引孔布置、孔径选择出发,基于平行作业的原则,介绍了组合工法的关键环节“钻”的实施方法,提出了适用于不同直径、不同岩石强度、采用不同钻孔设备的三种钻孔布置方法,并结合具体施工案例,对该工法的实际应用以及所取得的有益效果予以证实。最后阐述了“钻”“铣”两种作业方式的配合关系。

This paper briefly introduces the application background and working principle of the double wheel milling trench cutter.In view of the probleum happened in the process of underground diaphragm wall trench in hard rocks using double wheel milling,this paper analyzes the misunderstanding of the mere milling method at the present stage,and the disadvantages of the pure milling method in the hard rock working condition,concludes that mere milling in hard rock can not give full play to the core advantages of the double wheel milling cutter,and then puts forward a drilling and milling combination method applied to trenching in hard rock.The advantages of the combined construction method are analyzed,and based on the principle of parallel operation,the key step of the construction method“drilling”is emphatically introduced from the selection of the guide hole construction method,the guide hole arrangement and the hole diameter selection.Three kinds of drilling arrangement methods suitable for different diameters,different rock strengths and different drilling equipment are proposed.In regard to the relevant cases,the practical application of the construction method and the benefits achieved are verified and explained.In the end,it expounds the purposes of“drilling”and“milling”,and defines the primary and secondary relationship between them.