| 摘要 |
<p>In order to improve anchoring in the bore, in particular in order to absorb great loads in soft materials such as gas concrete, the part-side surfaces of the spreading sleeve 1 each slope outwards with respect to one another at an obtuse angle from the predetermined breaking line. The outer surface of the spreading sleeve 1 is expediently an elongate helix. By the arrangement of at least one predetermined bending line, running in an annular manner, on the circumference of the spreading sleeve 1, the anchoring portions are bent virtually at right angles. In order that the anchor bolt can be introduced even in the case of thin structure elements 16, with the simultaneous production of an insulating layer over the length of the spreading sleeve 1 and of the clamping bolt 2, an outer sleeve 13 provided with a retaining disc 14 is assigned to the spreading sleeve 1 and to the clamping bolt 2. The outer sleeve 13 and the retaining disc 14 can be produced in one piece or can be subsequently connected to form a unit. The outer sleeve 13 consists of an expandable or deformable material, with the result that, even after the triangular segments 17 have been spread out, it is guaranteed that the spreading sleeve 1 and the clamping bolt 2 are embedded and thus insulated against exterior influences. <IMAGE></p> |
