硬质岩旋挖成孔取芯施工技术

Rotary Drilling Hole and Core-taking Construction Technology in Hard Rock

针对旋挖桩机在中强度以上孤石或弧石层、中高强岩层的钻进出现倾斜、效率慢等技术难题,结合厦门帝景苑二期桩基工程旋挖成孔施工实例,分析了复杂硬质岩层旋挖成孔的钻头、钻具、施工工艺等方面的技术原理,提出了利用自制刻槽牙轮钻头先钻进成槽处理20m厚中风化花岗岩残留体层,以及使用刻槽钻头先钻进成槽和大直径取岩体钻头完整取芯的有效质量控制关键技术,取得了取芯完整、效率高的成果。

Aiming at the technical problems such as rotary digging pile to solve the above strength in boulder or arc stone layer, high strength of rock drilling in tilt, slow efficiency and so on, combined with rotary drilling hole example of pile foundation engineering of Dijingyuan phaseⅡin Xiamen, this paper analyzes the technical principles of drilling bit, drilling tool and construction technology for rotary drilling in complex hard rock strata, and puts forward the effective quality control key technologies of first drilling and grooving with self-made grooved roller drilling bit to treat 20 m thick residual body layer of moderately weathered granite, and first drilling and grooving with grooved drilling bit and completing coring with large-diameter rock drilling bit, efficient results are achieved.