Holding Units for Stay in Place Molds

Abstract

The instant invention provides stay in place molds for the construction of concrete structures comprising two boards or panels held together by a series of holding units that are fastened only to the interior surfaces of the cement panels by fastening means that are kept inside of the width of said panels. The holding units are selectively distributed at the internal cavity of the molds and are designed by a main cylindrical body having at least two internal ring units inside and two supporting plates at each one of the extremes of the main cylindrical body. The external, flat surface of the plates is permanently fastened only to the internal surface of the cement boards, thus forming strong stay in place construction molds having smooth external surfaces.

What is claim is: 
     
         1 . A holding unit useful in holding two fiber cement boards or panel units together, said holding unit comprising:
 an elongated cylindrical main body having a right end and a left end;   at least two rings inserted into said main elongated body;   two lateral supporting plates, each one of said plates comprising:
 an main flat body having an external surface and an internal surface; 
 a coupling unit permanently located at the center of the internal surface of said flat body and; 
   
       wherein the left end of the main elongated body and the right end of the main elongated body are fastened to the coupling unit on the internal surface of the lateral supporting plates. 
     
     
         2 . The holding unit as recited in  1 , wherein said main elongated body has an external continuous threaded surface. 
     
     
         3 . The holding unit as recited in  2 , wherein said coupling unit is internally threaded. 
     
     
         4 . The holding unit as recited in  3 , wherein said main elongated body is internally solid. 
     
     
         5 . The holding unit as recited in  3 , wherein said main elongated body is internally hollow. 
     
     
         6 . The holding unit as recited in  1 , wherein said main elongated body has an external continuous smooth external surface. 
     
     
         7 . The holding unit as recited in  6 , wherein said coupling unit is internally non-threaded. 
     
     
         8 . The holding unit as recited in  7 , wherein said main elongated body is internally solid. 
     
     
         9 . The holding unit as recited in  7 , wherein said main elongated body is internally hollow. 
     
     
         11 . The holding unit as recited in  1 , wherein the two lateral supporting plates are detachable from the main body. 
     
     
         12 . The holding unit as recited in  1 , wherein the two main bodies of the lateral supporting plates are square. 
     
     
         13 . A stay in place construction mold useful in the construction of concrete walls, said mold comprising:
 two panels or boards positioned parallel one to the other: each panel having a substantially flat external surface and an internal surface;
 multiple holding units, said holding units comprising:
 an elongated cylindrical main body having a right end and a left end; 
 at least two rings inserted into said main elongated body; 
 two lateral supporting plates, each one of said plates comprising:
 an main flat body having an external surface and an internal surface; 
 a coupling unit permanently located at the center of the internal surface of said flat body and; 
 wherein the left end of the main elongated body and the right end of the main elongated body are fastened to the coupling unit on the internal surface of the lateral supporting plates and; 
 
 
   
       wherein the external surface of said squared plates are glued at the internal surfaces of the panels or boards creating a series of multiple columns, wherein each column is apart from the next one at a pre-determined distance and wherein each holding unit is separated from the next holding unit within a given column at a predetermined distance. 
     
     
         14 . The mold as recited in  claim 13 , wherein the panels or boards are fiber cement panels or boards. 
     
     
         15 . The mold as recited in  claim 13 , further comprising a foam panel having the same dimensions of the fiber cement panels and attached to the internal surface of one of the fiber cement panels. 
     
     
         16 . The mold as recited in  claim 13 , further comprising interconnecting fiber cement units connected at one of the lateral sides of the mold. 
     
     
         17 . The mold as recited in  claim 13 , further comprising closing units that enclosed the left and right ends of the mold.