COMPOSITE PILE CONSTRUCTION METHOD

摘要

The present invention relates to a composite pile construction method, which increases a load resistance performance in a ground surface section and ensures constructability and workability while ensuring a front end support force for a micro pile by an internal pipe and a steel rod. The present invention includes a step of connecting an internal steel pipe to a head of a steel pipe exposed to an upper part of the ground surface to be extended to an earth and sand layer (G1), making an external steel pipe surround the internal steel pipe, integrating the external steel pipe with the internal steel pipe (122) using a device for closing a front end of the external pipe to integrate an upper steel pipe body with a lower steel pipe body, and forming the upper steel pipe body to have a dual pipe shape.