Existing pile foundation strengthening method based on grout control

• Main Authors: ZHENG SHUAI, WANG BINGXU, ZHANG QIANQING, GAO QIANG, ZHANG JIAN, WANG SHAOLEI, DUAN TONGJUN, WANG YONG, DING HEJIE, CHENG GUANGTAN, LIU CHUANXIAO, LI QIANG, TANG LIANG
• Format: Patent
• Language: Chinese; English
• Published: 03.07.2020
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

The invention provides an existing pile foundation strengthening method based on grout control and relates to the field of pile foundation construction. Drill holes with a certain number are distributed in the periphery of an existing pile foundation, double pipes are downwards put into the drill holes, and water pipes and grout pipes are arranged in the double pipes. Water injection nozzles and grouting heads are arranged at the bottoms of the double pipes and communicate with corresponding supplying ends through pipelines correspondingly; the water injection nozzles first output high-pressure water flow towards the existing pile foundation to disturb the soil body, and a softened strengthening area is formed; and then the grouting heads conduct low-pressure grouting on the softened area,the grout flowing range is easy to control, the strengthened area is filled and compacted, strengthening is conducted section by section till the ground surface is reached, the above method is repeated to strengthen the dril