Building construction system with split precast horizontal floor supports

Abstract

The disclosed building construction system with split precast horizontal floor supports combines the strength and ease of construction of pre-cast concrete, with ease of transportation of cast-in-place concrete. The system avoids the requirement of casting difficult shapes by breaking the complex T-shape sections of prior patents into separate flat pieces. The formwork for flat pieces is simpler than that of complex items that include both long and wide components. For examine, T-shapes and cross-shapes are hard to cast and difficult to transport because these shapes do not sit flat, and thus must be supported at their ends. Instead of this complex casting and transport, the slabs are separated into shapes that can later be placed around the columns. This simulates the strength of a fully-precast system, while reducing the precast costs and transportation costs.

What is claimed is: 
     
         1 . A hybrid precast and cast-in-place structure comprising:
 a precast column;
 the precast column installed in a vertical position; 
 the precast column formed from two or more precast column segments; 
 the two or more precast column segments connected by bridging rebar; 
   a precast central member;
 the precast central member installed in a horizontal position; 
 the precast central member formed from two or more precast central member components; 
 the two or more precast central member components surrounding the bridging rebar; 
 the two or more precast central member components resting on one of the two or more precast column segments; 
   wherein after assembly of the precast column and precast central member, concrete is poured across the hybrid precast and cast-in-place structure to create a unified structure;   whereby forming the precast column and the precast central member in pieces simplifies formwork requirements and transportation.   
     
     
         2 . The hybrid precast and cast-in-place structure of  claim 1 , wherein:
 the two or more precast central member components each include two or more component arms separated by a column gap, each precast central member component having a C-shape;   whereby the two or more precast central member components surround the bridging rebar.   
     
     
         3 . The hybrid precast and cast-in-place structure of  claim 1 , further comprising:
 a plurality of rebar stirrups;
 the plurality of rebar stirrups protruding from an 
 upper surface of the precast central member; 
   whereby the plurality of rebar stirrups helps to create a unitary structure.   
     
     
         4 . The hybrid precast and cast-in-place structure of  claim 1 , further comprising:
 a spanning member;
 the spanning member having a grid shape with solid sections and hollow sections; 
 the hollow sections including foam fillers to exclude the concrete poured across the hybrid precast and cast-in-place structure. 
   
     
     
         5 . The hybrid precast and cast-in-place structure of  claim 4 , further comprising:
 one or more spanning member rebar;
 the one or more spanning member rebar protruding outward from the spanning member; 
   whereby the one or more spanning member rebar are surrounded by concrete when the concrete is poured across the hybrid precast and cast-in-place structure   
     
     
         6 . The hybrid precast and cast-in-place structure of  claim 3 , further comprising:
 a spanning member;
 the spanning member having a grid shape with solid sections and hollow sections; 
 the hollow sections including foam fillers to exclude the concrete poured across the hybrid precast and cast-in-place structure. 
   
     
     
         7 . A precast structure for a building comprising:
 a precast column;
 two or more precast column segments forming the precast column;
 the two or more precast column segments separated by a floor gap; 
 
 the two or more precast column segments connected by bridging rebar; 
   a precast central slab;
 the precast central slab formed from two or more precast central components; 
 the two or more precast central components surrounding the bridging rebar; 
 the precast central slab installed by placement of the two or more precast central components on top of each of the two or more precast column segments, within the floor gap; 
   wherein after the precast column and the precast central slab are in place, then concrete is poured on top of the precast central slab, the concrete flowing into the floor gap and surrounding the bridging rebar;   whereby the precast structure is easy to transport due to separate precast columns and precast central slabs.   
     
     
         8 . The precast structure for a building of  claim 7 , wherein:
 the two or more precast central components each include two or more component arms separated by a column gap, each precast central member component having a C-shape;   whereby the two or more precast central components surround the bridging rebar.   
     
     
         9 . The precast structure for a building of  claim 7 , further comprising:
 a plurality of rebar stirrups;
 the plurality of rebar stirrups protruding from an upper surface of the precast central slab; 
   whereby the plurality of rebar stirrups helps to create a unitary structure.   
     
     
         10 . The precast structure for a building of  claim 7 , further comprising:
 a spanning member;
 the spanning member having a grid shape with solid sections and hollow sections; 
 the hollow sections including foam fillers to exclude the concrete poured across the spanning member. 
   
     
     
         11 . The precast structure for a building of  claim 10 , further comprising:
 one or more spanning member rebar;
 the one or more spanning member rebar protruding outward from the spanning member; 
   whereby the one or more spanning member rebar are surrounded by concrete when the concrete is poured across the precast structure   
     
     
         12 . The precast structure for a building of  claim 9 , further comprising:
 a spanning member;
 the spanning member having a grid shape with solid sections and hollow sections; 
   the hollow sections including foam fillers to exclude the concrete poured across the spanning member.   
     
     
         13 . A method of constructing a hybrid precast concrete and p our-in-place concrete structure comprising the steps of:
 placing one or more concrete base members;   placing a precast column upon one concrete base member of the one or more concrete base members;
 the precast column formed from two or more precast column segments; 
 the two or more precast column segments connected by bridging rebar; 
   repeating the step of “placing a precast column upon one concrete base member of the one or more concrete base members” until all of the one or more concrete base members are topped with columns;   placing two or more precast central member components around the bridging rebar of precast columns;
 the two or more precast central member components forming a precast central member; 
 the two or more precast central member components resting on one of the two or more precast column segments; 
   repeating the step of “placing two or more precast central member components around the bridging rebar of precast columns” until all bridging rebar is surround by one of the two or more precast central member components;   pouring concrete across the two or more precast central member components;   whereby forming the precast column and the precast central member in pieces simplifies formwork requirements and transportation.   
     
     
         14 . The method of constructing a hybrid precast concrete and pour-in-place concrete structure of  claim 13 , wherein:
 the two or more precast central member components each include two or more component arms separated by a column gap, the each precast central member component having a C-shape;   whereby the two or more precast central member components surround the bridging rebar.   
     
     
         15 . The method of constructing a hybrid precast concrete and pour-in-place concrete structure of  claim 13 , the precast central member further comprising:
 a plurality of rebar stirrups;
 the plurality of rebar stirrups protruding from an upper surface of the precast central member; 
   whereby the plurality of rebar stirrups helps to create a unitary structure.   
     
     
         16 . The method of constructing a hybrid precast concrete and pour-in-place concrete structure of  13 , the method further comprising the step of:
 before the step of “pouring concrete across the two or more precast central member components”, placing a spanning member;
 the spanning member having a grid shape with solid sections and hollow sections; 
 the hollow sections including foam fillers to exclude the concrete poured across the hybrid precast and cast-in-place structure.