公开(公告)号：US11828312B2

公开(公告)日：2023-11-28

申请号：US17266506

申请日：2019-07-29

Applicant: Hilti Aktiengesellschaft

Inventor： Frederic Pol ,  Cristian Jimenez ,  Michael Ziltener ,  Roland Schneider

IPC: F16B13/14 ,  F16B25/00

CPC classification number: F16B13/141 ,  F16B25/0026 ,  Y10T29/49966

Abstract: A method for temporarily releasing a screw anchorage includes unscrewing and removing a primary screw having a thread that is tappingly engaged in a mating thread in an ungrouted hole in a mineral substrate from the ungrouted hole. Subsequently to the unscrewing and removing, a retrofitting screw is screwed into the hole to form an annular gap between the retrofitting screw and the mineral substrate. A hardenable grout is placed in the annular gap and the hardenable grout is hardened in the annular gap.