Patent ID: 8146323
Filing Date: 2012-04-03
Classification: E02D

Abstract:
1. A method of installing tower flange anchor bolts in a wind turbine foundation comprising the following steps: preparing a foundation bore hole; dividing the total number of tower flange anchor bolts to be installed in the foundation bore hole into a plurality of groups; assembling a first anchor bolt package comprising bolts from a first group, wherein the first anchor bolt package comprises a plurality of axially aligned bolts configured to form an inner arc of bolts and an outer arc of bolts, wherein each bolt is retained, by position retention means, in a position, with respect to the position of adjacent bolts, which is substantially the same position as when the first bolt package is placed within the foundation bore hole; assembling additional anchor bolt packages wherein each additional anchor bolt package comprises a similar configuration as the first anchor bolt package until the total number of anchor bolts to be installed are contained within an anchor bolt package; and lowering each anchor bolt package into the bore hole and arranged such that the inner arc of bolts of each anchor bolt package form an inner circle of upwardly facing anchor bolts and the outer arc of each bolt package form an outer circle of upwardly facing anchor bolts.