| 摘要 |
Fastening elements which are used to secure heavy loads are braced in the drill hole by means of an expanding element which is inserted into an expanding sleeve. If the fastening element is subjected to high instantaneous loads because of earth tremors, for example, there is a danger of the fastening element breaking loose from the drill hole. To ensure that, even after the occurrence of high overloading, the fastening element continues to maintain its retaining function, there is provided an expanding sleeve which is divided into two expanding sections arranged in series. Between these expanding sections there is a predetermined breaking area which breaks when overloading occurs. The expanding element can then move outwards inside the expanding sleeve, the energies introduced being dissipated in the form of deformation energy and frictional energy. The fastening element is thus suitable particularly for use in regions prone to earthquakes or in areas having higher than normal safety requirements.
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