Method for reducing negative friction in backfill area of cast-in-situ bored pile

• Main Authors: YANG XIJING, WU ZHENG, QI XIPENG, DANG TAO, REN LIJUN, LIANG HUI, SHAO YINGGANG, YE SUXIAN, CHEN QIANG, ZHANG HAOTIAN, MIAO MIAO, LEI WEI, CAO GENG
• Format: Patent
• Language: Chinese; English
• Published: 06.12.2022
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

The invention relates to a method for reducing negative friction resistance in a backfill area of a cast-in-situ bored pile, which comprises the following steps: according to the current situation of backfill soil in a loess high-fill area and the construction position of a subsequent pile foundation, solidifying backfill soil in an area needing pile foundation pore-forming by using a high-pressure jet grouting pile, and performing pile foundation pore-forming construction after cement paste is solidified, so as to reduce the negative friction resistance in the backfill area of the cast-in-situ bored pile. The problem of hole wall collapse during loess high filling area pile foundation hole forming can be effectively solved, and the pile forming efficiency and quality of a pile foundation during pile foundation construction are improved. When a cast-in-situ bored pile is constructed, a longitudinal grouting main pipe, a horizontal grouting branch pipe and a grouting head are arranged on a reinforcement cage i