In 1660, at the invitation of Hisakiyo NAKAGAWA, who was the feudal lord of the Oka Domain of Bungo Province, Banzan went to Takeda and gave advice including that about construction work.
万治3年（1660年）には豊後国岡藩主中川久清の招聘を受け竹田に赴き土木指導などを行った。