| 摘要 |
<p>An annular steel wedge (2) divided into individual wedge sections (2a, 2b, and 2c Fig. 2, not shown) is used to anchor a tension element (1) in a prestressed concrete structure (4). Prior to forming the individual wedge sections from an axially extending annular wedge blank, the inside surface of the blank is threaded forming circumferentially extending teeth (11) so that the wedge can grip the tension element and provide the requisite friction coefficient in the anchorage. To prevent the sharp teeth formed in the threading step from cutting into the surface of the tension element, the teeth are ground down in a tumbling operation in which the wedge sections (2a, 2b and 2c) are mixed together with ceramic grinding bodies in a tumbling drum. The grinding bodies have bends in at least a portion of their surfaces and the bends have a smaller radius than the radius of the threaded inside surface of the wedge. <IMAGE></p> |
