Hilti Aktiengesellschaft

Joerg Appl

Marc Schaeffer

Mathias Goldt

Arjen Detmer Dijkhuis

Andreas Eckstein

Christoph Hakenholt

Peer Schmidt

Bernhard Sander

Serhey Khandozhko

Matthias Paetow

Roger Tognini

Clemens Lutz

Marc Schäffer

An expansion bolt including an anchor bolt having an expansion section, and further including an expansion sleeve which surrounds the anchor bolt and which can be expanded by retracting the expansion section, and a spring element arranged on the anchor bolt. The spring element can be tensioned by inserting the anchor bolt into a bore hole and can retract the expansion section of the anchor bolt into the expansion sleeve when it is released. An indicator element indicates when a rated tension of the spring element is reached.

Expansion bolt

An expansion anchor, in particular for mineral construction materials, for example, concrete, is disclosed. A generic expansion anchor is equipped with an expansion sleeve for anchoring on a borehole wall and with an anchor bolt, which is disposed through the expansion sleeve, where the anchor bolt has an expansion region for expansion of the expansion sleeve. The anchor bolt has a cutting thread for cutting a thread into the borehole wall. A respective setting tool and setting method are also disclosed.

Expansion anchor

A sensor arrangement, for example, on an anchor bolt, including at least one sensor (). At least one bypass element () with a dilatant material is arranged in the area of the sensor (), whereby impact forces that act upon the sensor () can be dissipated via the dilatant material of the bypass element ().

Sensor arrangement, for example, on an anchor bolt

A direct tension indicator (), including a base element () and a cover element () that is arranged on the base element () and at least one indicator element () that is arranged between the base element () and the cover element () in order to display an axial force acting between the base element and the cover element. The indicator element () includes a dilatant material.

Load-indicating washer

An installation method for an expansion anchor is carried out by repeatedly exerting rotary-percussive strikes onto the shank () of the expansion anchor () by an impact screwdriver. The repeat rate (N) of the rotary-percussive strikes is selected as a function of the tightening torque prescribed for expanding the expansion sleeve () of the expansion anchor (). The impact screwdriver stops generating rotary-percussive strikes when the detected mean rotational speed (d) of the shank falls below a threshold value (D).

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Buchs, Switzerland

Joerg Appl