| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a drilling method for the inside of a driven steel pipe joint which can set a device without causing interference as a device which is different from a drilling device for drilling a main pipe portion, quickly releases the pressure tightness of sediment generated in a joint-inside driven hole and a joint when driving a steel pipe, and can perform large-diameter and deep-depth construction to the hard soil or the like, and the device.SOLUTION: A columnar guide cell 8 is vertically erected on an existing construction at a ceiling end of a driven steel pipe 4 or in the vicinity of the driven steel pipe via a pedestal 9, a drifter 7 is lowered along the guide cell 8, and the drilling of the inside of a joint 4a is performed by a prescribed length with the joint 4a as an insertion guide by using a tip bit 5 of a rod 6 which is connected to the drifter 7.</p> |
