Electric heating – Inductive heating – Specific heating application
Patent
1993-08-17
1995-02-14
Leung, Philip H.
Electric heating
Inductive heating
Specific heating application
219637, 219670, 219618, 83 16, H05B 610
Patent
active
053897650
ABSTRACT:
An arrangement for severing a tension member of a permanent soil anchor of ferromagnetic material at a predetermined location includes a coil surrounding the tension member in a tubular manner at the predetermined location, wherein the coil is mountable together with the tension mender. A high temperature-resistant thermal insulation layer is provided underneath the coil and a tubular core is arranged between the high temperature-resistant layer and the tension member, so that the coil forms a primary winding and the core forms a first secondary winding and the tension member forms a second secondary winding. The tension member is severed by applying an electric current having a frequency of approximately 5 to 30 kHz and a voltage of approximately 500 to 800 V to the coil, so that the tensile strength of the tension member is reduced at the predetermined breaking point by the heat produced by induction resulting from the electric current.
REFERENCES:
patent: 2178720 (1939-11-01), Daniels
patent: 2948797 (1960-08-01), Kurtz
patent: 4007349 (1977-02-01), Burley
patent: 4916278 (1990-04-01), Rudd et al.
patent: 5075529 (1991-12-01), Kudo
Dyckerhoff & Widmann Aktiengesellschaft
Kueffner Friedrich
Leung Philip H.
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