Method and device for double-spiral in situ pouring pile formation

Application Number: 00121010Application Date: 2000.07.17Publication Number: 1275661Publication Date: 2000.12.06Priority Information: International: E02D5/36Applicant(s) Name: Qin ZhongzeAddress: Inventor(s) Name: Qin Zhongze;Qiu Jinfen;Qiu YihuiPatent Agency Code: 14100Patent Agent: wang jinsuoAbstract The invented pile-forming method for double-spiral cast-in-situ pile includes the following steps: (1). putting drilling machine in position and external spiral hole-forming; (2) using rotation of internal spiral Read more