Composite, pre-stressed structural member and method of forming same
OwnerStanley J. Grossmaninventor
Life of this patent
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Abstract
A composite, pre-stressed structural member comprised of concrete and a lower metal support member, and method for forming and pre-stressing the same. The metal support member and a concrete mold are connected for parallel deflection with the support member uppermost and shear-connectors extending into the mold. The connected mold and support member are supported for deflection and concrete is poured into the mold and allowed to harden. During hardening of the concrete the mold and support member are deflected by the weight of the concrete, mold and support member, pre-stressing the support member. Upon hardening of the concrete and inverting to a concrete-uppermost position, a composite, pre-stressed structural member is provided.
Claims11
A method of forming a composite, pre-stressed structural member of the type having an upper molded surface supported by a lower support member comprising:
- connecting a lower support member to the upper side of a mold so that deflection of the mold causes deflection of the support member and such that support member connector means extend downwardly into said mold;
- supporting the mold and lower support member so that deflection of the mold and lower support member can occur;
- filling the mold with a moldable material which hardens to form a composite structural member with said lower support member;
- and
- deflecting the mold during hardening of the moldable material such that the support memberr is placed in a stressed condition to form a composite, pre-stressed structural member upon hardening of the moldable material.
Dependencies are inferred from the claim text.