DRILLING METHOD AND DRILLING DEVICE

To provide a drilling method and a drilling device to be excellent in drilling workability of a vertical hole from a ground surface portion.SOLUTION: A drilling method for drilling a vertical hole 2 in a ground surface portion 1 by using an earth auger drilling machine 10, includes a reader installation step of installing a leader 14 that supports an auger screw 21 so as to be able to move up and down, at a predetermined distance above the ground surface 1, and a drilling step of lowering the auger screw 21 along the leader 14 and drilling the vertical hole 2 in the ground surface portion 1. And also the drilling step has an installing step of installing a guide jig 40 having a hollow cylindrical tube portion 41 on the ground surface portion 1, a pressing step of pressing the ground contact portion 42 of the guide jig 40 that is in contact with the ground surface portion 1 against the ground surface portion 1, and the inserting step of inserting the auger screw 21 into the tube portion 41 of the guide jig 40.SELECTED DRAWING: Figure 1 【課題】地表部への縦穴の掘削作業性に優れた掘削方法及び掘削装置を提供する。【解決手段】アースオーガ掘削機１０を利用して地表部１に縦穴２を掘削する掘削方法であって、オーガスクリュー２１を昇降可能に支持するリーダ１４を、地表部１の上方に所定距離離間して設置するリーダ設置工程と、オーガスクリュー２１をリーダ１４に沿って下降させ、地表部１に縦穴２を掘削する掘削工程と、を備え、掘削工程は、中空筒状の筒部４１を有するガイド治具４０を地表部１に設置する工程と、ガイド治具４０における地表部１に接する地表接地部４２を、地表部１に対して押圧する工程と、ガイド治具４０の筒部４１内にオーガスクリュー２１を挿入する工程と、を有する。【選択図】図１