Bottom reaching judgment method and device of underwater sand compaction pile

• Main Authors: WU XINYI, ZHANG HAI, XIE JINBO, ZHU JUNYI, MA ZHENJIANG, SHI BEILING, LIU LU, WANG XIAOJIAN, ZHANG XI, HU XIAOBO, YIN HAIQING
• Format: Patent
• Language: Chinese; English
• Published: 21.07.2017
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

The invention provides a bottom reaching judgment method and device of an underwater sand compaction pile. The judgment method includes the following steps that (1) a sand pile casing pipe is driven with pressure, and when the sand pile casing pipe approaches the treatment soil layer bottom elevation, the end pressure of the sand pile casing pipe is tested through a pressure box at the lower end of the sand pile casing pipe; and (2), when the end pressure measured by the pressure box tends to be steady, the sand pile casing pipe reaches the bottom, the sand pile casing pipe is stopped from being driven with pressure, and the sand pile casing pipe begins to be pulled up with pressure. By means of the bottom reaching judgment method and device of the underwater sand compaction pile, whether the sand pile casing pipe reaches the bottom or not can be judged accurately, time for stopping driving with pressure and time for beginning upwards pulling with pressure of the sand pile casing pipe are determined, and the