COMPACTING SAND PIPE CONSTRUCTING METHOD FOR DIRECT BEDROCK SUPPORT GROUND FOR STRUCTURE

摘要

PROBLEM TO BE SOLVED: To precisely predict and confirm security of a specified sand pile compaction or N-value between sand piles when a compacting sand pile construction method for direct bedrock support ground is improved by the formation of compacting sand piles. SOLUTION: A specified sand pile compaction degree or a N-value between sand piles is secured by forming sand pile while keeping corelation P constant while making use of a corelation P constant while making use of a corelation P in the casing driving back process at the time when a compaction sand pile is constituted in the initial tangential inclination Ka of a load-settling curve of the improving ground and a non-vibration method, or corelation of the N- value between the piles in the improving ground and the compacted effect and the reaction between the compaction effect and the reaction P.