Abstract: A hold-down anchor device for securing reinforcing strands in a mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set, is held in place by an anchor means traversing the mold wall. The hold-down anchor device includes a pair of side frame elements which are disposed parallel to each other and positioned generally vertically in the mold. A number of strand hold-down means extend transversely between the side frame elements. A swivel means is pivotally secured to the lower ends of the side frame elements and includes means for engaging the anchor means. The swivel means further includes means for retaining one or more reinforcing strands near the lower ends of the side frame elements in corresponding closely spaced relation with the mold. The swivel means may include either grooves or rollers for retaining the reinforcing strands near the lower ends of the side frame elements.

Abstract: A bar support for supporting a plurality of longitudinally extending reinforcing bars and a transversely extending reinforcing bar includes a cross rod which is positioned beneath the transversely extending reinforcing bar and extends along the bar in parallel relationship, and a plurality of bar support chair means which are laterally spaced along the cross rod. Each of the bar support chair means includes a first member having a first vertical leg portion extending above and displaced from the cross rod and a second member having a second vertical leg portion extending above and laterally displaced from the cross rod on the opposite side of the cross rod from the first leg portion. Longitudinally extending reinforcing bars are held between the leg portions transversely to the cross rod, and the transversely extending reinforcing bar is held between the leg portions parallel to the cross rod.

Abstract: A plug assembly, for temporary use with a concrete product insert having a coil defining an interior threaded surface, holds the insert in position adjacent a mold wall and prevents the interior of the coil from being filled with concrete. The plug assembly includes a plug having a hollow cylindrical elastomeric body defining a cavity which is open at one end of the body and a stem in the cavity attached to the body internally and extending out of the cavity a distance sufficient to provide for use of the stem as a handle. The outer surface of the cylindrical, elastomeric body is proportioned and threaded for firm matching engagement with the threaded coil interior surface upon predetermined radial compression and axial expansion of the body from its substantially unstressed condition. A support means has a first portion for insertion into the cavity in the elastomeric body and a second portion for attachment to a mold wall.

Abstract: A plug for temporary use with a coil insert in a concrete product such as a slab or panel comprises a hollow elastomeric body having the outer surface thereof proportioned and threaded for firm matching engagement within the threaded interior surface of the coil with which it is to be used upon predetermined radial contraction and axial elongation from the unstressed condition thereof. The plug is open at one end and closed at the other end, with a stem of smaller diameter projecting from its closed end. The plug is assembled in the coil by means of a rod forced internally against its closed end, causing the plug body to elongate and contract radially sufficiently to be moved axially into place within the coil, and it is removed from the coil by using its stem as a handle for applying pulling force causing sufficient elongation and radial contraction of the plug body for withdrawal from the coil.

Abstract: Tilt-up building wall panels are fitted with inserts which are cast into the panel. The inserts have threaded openings into which a collapsible split bolt is inserted. The bolt is spread apart with a longitudinally inserted wedge to secure its exterior thread to the interior thread of the insert. The panel is erected into its upright position with suitable hoisting equipment engaging the protruding portion of the split bolt. The split bolt and the hoisting equipment are removed from the ground with a ground release device that is raised overhead with extensions attached to the release device. The release device includes a support structure which has a flat end face that is positioned against the side of the upright panel and a linearly reciprocating release plate mounted to the support structure. The operator positions the release device so that the release plate engages a portion of the wedge and he then retracts the plate by pulling a suitably connected actuating cable from the ground.

Abstract: The split bolt comprises plural bolt segments having threaded outer surfaces which are brought radially together to render the bolt insertable into a complementary threaded recess, and spaced radially apart to cause the bolt threads to become engaged when an elongated, generally cylindrically shaped wedge member is inserted between the segments to space them into the threaded engagement. The wedge member has plural camming surfaces along the length thereof which engage corresponding camming surfaces on the inside surfaces of the bolt segments. Further, the bolt segments are interconnected by an elastic means which surrounds the segments and keeps them in surface contact with the wedge member inserted therebetween.