STEEL SHEET PILE CONTINUOUS DRIVING METHOD TO HARD ROCK STRATUM

PROBLEM TO BE SOLVED: To provide a steel sheet pile continuous driving method to a hard rock stratum capable of continuously forming boring with even a small diameter borable in the hard rock stratum by one civil engineering foundation machine in a lap mode even if drilling power is small and continuously driving a sheet pile in a lap boring by vibro of the wide sheet pile having the width larger than the diameter of the boring. SOLUTION: An independent boring C1 is formed by a common danza hole hammer to make vibro-driving of the steel sheet pile P into the hard rock stratum, a first lap boring C2 is formed by leading a section guide 5 with a steel sheet pile section PE by the danza hole hammer 3 equipped with a section guide 5, and a second lap boring WC2 is formed by leading the section guide W5 with the steel sheet pile section PE by the danza hole hammer W3 equipped with a projected arm section guide W5. Then, the wide steel sheet pile WP is driven by vibration over the first lap boring C2 and the second lap boring WC2, and a pair of boring works of the first lap boring C2 and the second lap boring WC2 having small diameters and the wide steel sheet pile are repeatedly driven to continuously drive the wide steel sheet pile. COPYRIGHT: (C)2004,JPO&NCIPI