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Prestretching of the ropes anticipates much of the permanent elongation occuring during the initial phase of operation. This procedure helps to reduce interruptions and expenditure for shortening the ropes at attachments, as well as to reduce previous difficulties during the start-up period. The problems of equalising rope loads on multi-rope installations are eliminated when using prestretched ropes. The expected extension of operational life of prestretched ropes is confirmed. The provision of magnetic rope markers for contact-free measurement of local rope elongations was continued. The new system no longer relies on coils, but uses Hall effect sensors instead. For newly installed winding ropes elongations between 0.4% and 0.8% were expected during the first operational phase; the required measuring accuracy was attained.

Additional information

Authors: WBK, Westfälische Berggewerkschaftskasse, Bochum (DE)
Bibliographic Reference: EUR 12011 DE (1990) MF, 169 pp., ECU 8
Availability: (2)
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