System for anchoring a load

摘要

The invention relates to a method for anchoring a load (26) to an anchorage (30) utilizing at least one unitary anchoring tendon (10) including a plurality of tensile elements (12) each having a free length (14) and a bond length (18). The tendon is located lengthwise in a bore (34) formed through the load into the anchorage, and different groups (G1, G2, G3) of the strands of the tendon are tensioned in a predetermined sequence to a respective initial displacement length prior to the different groups being collectively tensioned to a respective final displacement length to anchor the load.

主权项

1. A method for anchoring a load to an anchorage, comprising:
providing at least one unitary anchoring tendon including a plurality of tensile elements each having a bond length and a free length, the tensile elements being fixed together at a leading end of the tendon; forming a respective bore through the load into the anchorage for each said tendon; inserting a said tendon lengthwise into the respective said bore for the tendon such that the leading end of the tendon is passed through the load into the anchorage, wherein the tensile elements are ordered into different groups, the free length of the tensile elements in each said group being different to the free length of the tensile elements in each other said group whereby the bond length of the tensile elements of the different said groups provide bond transfer regions of the tendon that are staggered from one said group to the next along a bond zone of the tendon for load transfer to the anchorage via grout with tensioning of the groups of tensile elements; once the grout has sufficiently cured or set, tensioning the different said groups of tensile elements in a predetermined sequence to extend the free length of the tensile elements to a respective initial displacement length, to compensate for the differences in the free length of the tensile elements between respective of the groups; subsequently, collectively further tensioning all of the tensile elements of the tendon together to extend the free length of all of the tensile elements by a predetermined length to a respective increased final displacement length; and securing the tendon to the load to maintain the tension in the tensile elements.