Hard granite stratum variable cross-section pile foundation hole forming method and pouring method

• Main Authors: LU HAIJUN, LI MINHENG, ZHOU MIAO, SHA HANGYU, LIN GUANGDONG, CHEN ZHONGWEN, LUO YU, LIU JIAXING, ZHAN CHUANZE, REN PANFENG, LIU CHEN, LI YUANXING
• Format: Patent
• Language: Chinese; English
• Published: 15.08.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

The invention discloses a hard granite stratum variable cross-section pile foundation hole forming method and pouring method.The hole forming method comprises the following steps that S1, a pile foundation operation platform is erected, and a pile casing positioning and guiding device is installed on the pile foundation operation platform so that the axial deviation and verticality construction quality of a pile foundation in water can be improved; s2, the pile casing is lowered down along the pile casing positioning and guiding device, and the pile casing is vibrated and buried into a rock stratum in water through a vibration device; s3, a rotary drilling rig is in place, a rotary drilling rock-entering pile forming mode is adopted, a multi-drill-bit combined sleeve drill extends into the pile casing, and drilling is conducted on the rock stratum step by step; and drilling construction of the lower portion of the variable-cross-section pile foundation is completed until the drill bit drills to the designed b