Importance

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Abstract

Concrete barrier structures for use in forming holes in concrete slabs or the like can be constructed so as to include a peripheral wall shaped as the frustum of a right circular cone having an upper end and a lower end. A closure is provided to close off the upper end of the peripheral wall. A series of equally spaced, identical upper supports are located on the exterior of this peripheral wall intermediate the ends of this wall. Grooves are provided on the interior of the peripheral wall for accommodating the upper supports on an adjacent, nested barrier structure. Depending upon the depth or thickness of a slab only one of such a barrier structure may be used with its lower end of a horizontal surface when the slab is cast in place or two or more of the barrier structures may be placed on one another with any two adjacent barrier structures located with the uppermost barrier structure either resting on the upper supports of the next lower barrier structure in an upper position or being located with such supports on the lowermost barrier structure fitting into the grooves on the uppermost barrier structure in a lower position.

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First Claim