ABSTRACT
The use of packers in radial joints is common in segmental shaft construction. For off the shelf segmentally lined shafts, the packers are usually specified by the manufacturers at the radial joints, notionally to improve stress distribution at the joints. This paper intends to provide an overview of the use of packers in precast segmentally lined shafts as, on occasion, the purpose and design effects are not always fully understood. There is limited published data on the effect of packers, particularly in the long-term for performance and durability, which leaves design uncertainties for the permanent works despite the anecdotal benefit for the construction phase.Design decisions, and analysis methods are explored to develop an understanding of the influence of packers using sensitivity studies which provides the theoretical benefits, and potential draw backs of the packers. Packer geometry along with joint geometry is also explored in terms of their influence on the lining design. Finally, recommendations from the author’s experience when specifying these elements and potential areas for future research are also discussed.
