Hilti Aktiengesellschaft

Daimler Ag

Frédéric Pol

Tilmann Haug

Roland Schneider

Michael Ziltener

Wolfgang Kleinekathoefer

Wolfgang Kleinekathöfer

Cristian Jimenez

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.

Method for temporarily releasing screw anchorage

UHC lightweight structural steel with improved scaling resistance, comprising the composition in % by weight C: 1 to 1.6, Al: 5 to 10, Cr: 0.5 to 3, Si: 0.1 to 2.8, the remainder iron and customary impurities accompanying steel, and a method for producing components hot-formed from this in air, wherein hot-forming temperatures of from 800 to 1050&#xb0; C. are used, depending on the Si content.

Components made of steels with an ultrahigh carbon content and with a reduced density and high scaling resistance

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Feldkirch, Austria

Frédéric Pol