S e c t i on 2 - P a ge 5 May 2013 Expansion Shell Resin Installation Accessories T andem Anchor Components • #6 ( 3 / 4 ") or #7 ( 7 / 8 ") headed r ebar • expansion shell (usually D8) • support nut • washer (2" or 2 1 / 4 ") • for 1 3 / 8 " or 1 1 / 2 " drill holes • T andem Anchor Bolts a re "POINT ANCHOR BOL TS" because the full length of the bolt is placed under tension. Resin is inserted into the drilled hole followed by the bolt. Rotation of the bolt mixes the r esin and causes the expansion shell to expand and place the bolt in tension. This system incorporates both mechanical (expansion shell) and r esin anchorage. www .dsiundergr ound.com