旋挖钻机用气动潜孔锤反循环硬岩钻进技术

为解决旋挖钻机在硬岩地层中施工困难的问题，借鉴地质钻探领域成熟的工艺方法，研制了适用于旋挖钻机用的空气潜孔锤反循环钻进工艺方法及设备。该工艺方法在不改变旋挖钻机任何结构的情况下，配套空气潜孔锤反循环钻具即可实现硬岩的快速钻进，解决了大口径钻探排渣困难的难题，且能够达到环保的要求。气动潜孔锤反循环钻具的设计全面考虑了大口径桩基施工及潜孔锤应用特点，气水龙头的双通道、大通孔设计满足进气排渣要求，反循环双壁钻杆为同心式，密封可靠，钻具的连接采用六方快速连接。通过在厦门地铁施工试验，验证了其可行性。

Reverse-circulation Hard Rock Drilling Technology with Pneumatic DTH Hammer for Rotary Drilling Rig

In order to solve the construction difficulties of the rotary drilling rig in the hard rock strata, by drawing on the mature process method in the field of geological drilling, the method and equipment for the reverse drilling process of the pneumatic DTH hammer for the rotary drilling rig are developed. Without changing the structure of the rotary drill rig, the reverse drilling tools of the pneumatic DTH hammer are applied to achieve fast hard rock drilling to solve the difficult cuttings expelling in large diameter drilling, and the environmental requirements are met. According to the construction requirement of large diameter pile foundation and the application characteristics of the DTH hammer, the reversed circulation pneumatic DTH hammer drilling tool is designed, the double channels for air and water with large center diameter can meet air inletting and cuttings expelling. Reversed circulation double drill pipes are concentric type with reliable sealing. The hexagon structure is used for the drilling tools connection. The feasibility of the technology and equipment are verified in the construction of Xiamen subway.