After The Super Long Bored Piles In Deep Soft Soil Grouting Key Technology Research

Bored after grouting technology can effectively reduce the pile bottom sediment and piles of mud cake on the pile of inherent defects, can significantly increase the carrying capacity of the pile, and to improve the pile-soil interaction relationship between, and to reduce the length of the pile. Now, with the rapid development of pile foundation engineering technology, the technology to show strong momentum of development, and constantly expanding range of applications.In this thesis, Qianqing Town, Shaoxing City, the size of the river bridge approach to field test grouting theory and mechanism of post grouting technology of bored piles were analyzed, focusing on soft ground long after deep pile grouting process control technology research, and site pilot study measured the effect of squeezing through static load test and acoustic detection and grouting problems occurred during analysis, the following conclusions:1. On the basis of post-grouting bored at home and abroad research on the comparative analysis of pile grouting pile grouting and conduct all aspects of the theory side end pile-depth study, will allow people to recognize post-grouting mechanism continuous improvement of grouting pressure on the pile end bearing elements (side) deepening understanding. Meso grouting mechanism and mechanical properties, grout diffusion research to perfect.2. Analysis and abroad after grouting process, based on the comparison performed after grouting design of deep soft ground Bored Piles determine pile tip side joint grouting pile construction technology, grouting way, and after grouting equipment and technology selection principle.3. Relying on field test on the pile end side joint grouting pile and pile grouting unplugging time, unplugging pressure water injection, grouting, grouting pressure, grouting sequence, grouting and related issues arising in the course It was analyzed and take relevant measures. For pile side PVC pipe grouting process success is low, seamless steel pipe bends instead of round, improve the reliability of the pile side of the grouting and the like.4. Grouting pile and non-pile grouting two test piles field static load test, the static load test results were analyzed by analysis of Q-S curve and static load test under axial force, lateral friction, obtained after grouting pile load transfer mechanism and failure characteristics and design parameters to improve the bearing capacity; and through the acoustic transmission method for non-destructive testing test piles. It can be used to guide engineering practice and theoretical research. Examples of verification by the good economic benefits.