OSCILLATORY IMPACT-TYPE LIGHT-WEIGHT GROUND INVESTIGATION MACHINE, AND OSCILLATORY IMPACT-TYPE GROUND INVESTIGATION METHOD

PROBLEM TO BE SOLVED: To provide an oscillatory impact-type light-weight ground investigation machine and an oscillatory impact-type ground investigation method, the oscillatory impact-type light-weight ground investigation machine being capable of investigating hardness equivalent to a bearing ground of a foundation of a transmission line tower and the like, and light enough to be carried on a person's shoulder.SOLUTION: An oscillatory impact-type light-weight ground investigation machine 10 includes: a penetration rod 12 formed in a straight rod form or a straight cylindrical form; a tip cone 14 fitted on a tip of the penetration rod 12 and penetrated into an investigated ground; a knocking head 16 fitted on a head part of the penetration rod 12; a mechanical power generating part 24 generating mechanical power; an oscillatory impact part 26 fitted on the knocking head 16 and making an oscillatory impact from above at constant thrust and at a constant vibration number; and a power transmission part 28 conveying the power generated by the mechanical power generating part to the oscillatory impact part 26; as well as a portable oscillatory impacting device 18; and an automatic penetration speed recording device (a wire encoder 20, a data logger 22) for measuring and recording penetration speed of the penetration rod 12.SELECTED DRAWING: Figure 1 【課題】送電鉄塔等の基礎の支持地盤相当の硬さを調査可能であると共に、人肩で運搬可能な重量まで軽量化された振動打撃式軽量地盤調査機及び振動打撃式地盤調査方法を提供する。【解決手段】振動打撃式軽量地盤調査機１０は、真直棒状又は真直筒状に形成された貫入ロッド１２と、貫入ロッド１２の先端部に装着され、調査地盤に貫入される先端コーン１４と、貫入ロッド１２の頭部に装着されたノッキングヘッド１６と、機械動力を生じさせる機械動力発生部２４と、ノッキングヘッド１６に装着されると共にこれをその上方から一定の推力でかつ一定の振動数で振動打撃する振動打撃部２６と、機械動力発生部で発生した動力を振動打撃部２６に伝達する動力伝達部２８と、を含んで構成されていると共に、持ち運び可能とされた振動打撃装置１８と、貫入ロッド１２の貫入速度を測定して記録する貫入速度自動記録装置（ワイヤエンコーダ２０、データロガー２２）とを備えている。【選択図】図１