Investigation in the central area (Hon-maru) of Osaka Castle at the Toyotomi period by sub-surface prospecting

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K12936
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Japanese history
• Research Institution: Osaka City University
• Principal Investigator: NIKI Hiroshi 大阪市立大学, 大学院文学研究科, 教授 (90222182)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 大坂城 / 豊臣秀吉 / サウンディング調査

Outline of Final Research Achievements

Swedish weight sounding test (penetration test) was carried out in the surrounding area of the elevated ground for main tower called “Tenshu-dai”, and the northern area called “Yamazato-guruwa” and “Ashida-guruwa” at the Toyotomi period. The results of the investigation precisely clarified the location of the Tenshu-dai, the stone wall step between “Yamazato-guruwa” and “Ashida-guruwa”, and the heights and angles of the stone walls which are drawn in the castle view at the Toyotomi period of “Toyotomi-ki Osaka-jo Honmaru-zu” in the possession of Nakai Family.
The result by this investigation serves as one of the baseline for the research advance on Osaka Castle at the Toyotomi period, and made a contribution to the new survey method on the sub-surface situation at the area where excavation activities are difficult.

Free Research Field

日本中世史