US2009193731A1PendingUtilityA1

Concrete form duct chair and method

32
Individually held — no corporate assignee on recordPriority: Feb 6, 2008Filed: Feb 6, 2008Published: Aug 6, 2009
Est. expiryFeb 6, 2028(~1.5 yrs left)· nominal 20-yr term from priority
Inventors:James E. Fabinski
E04G 21/1841
32
PatentIndex Score
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Claims

Abstract

An improved concrete form duct chair and method of forming concrete structures. The concrete form duct chair has a generally flat polymer or steel body with several pre-stressing strand duct sized apertures passing through the body, as well as four or more alignment legs projecting from the body, the alignment legs and body dimensioned and configured to extend for a total width approximately equal to such cross sectional width of such concrete form and thus hold the concrete form duct chair in position against the walls of the form. Concrete access apertures passing through the body allow concrete to pass therethrough during pouring operations. A method embodiment of the invention teaches pouring of concrete structures with pre-stressing ducts passing therethrough using the device of the invention to retain the pre-stressing ducts in alignment within the concrete form.

Claims

exact text as granted — not AI-modified
1 . A concrete form duct chair of a concrete form having both a first cross sectional width and a first pre-stressing strand duct, the first pre-stressing strand duct having a first pre-stressing strand duct diameter, the concrete form duct chair comprising:
 a generally flat body;   a first duct aperture passing through the body, the aperture having a first duct aperture diameter approximately equal to such first pre-stressing strand duct diameter;   first and second alignment legs projecting from the body, the alignment legs and body dimensioned and configured to extend for a total width approximately equal to such cross sectional width of such concrete form; and   a first concrete access aperture passing through the body, the concrete access aperture dimensioned and configured to allow semi-liquid concrete to pass therethrough.   
   
   
       2 . The concrete form duct chair of  claim 1 , wherein the material of duct chair comprises one member selected from the group consisting of: polymer, metal, wood, and composites thereof. 
   
   
       3 . The concrete form duct chair of  claim 1 , further comprising:
 third and fourth alignment legs projecting from the body, the third and fourth alignment legs and body dimensioned and configured to extend for a total width approximately equal to such cross sectional width of such concrete form.   
   
   
       4 . The concrete form duct chair of  claim 1 , further comprising:
 a second duct aperture passing through the body, the aperture having a second duct aperture diameter approximately equal to such first pre-stressing strand duct diameter.   
   
   
       5 . The concrete form duct chair of  claim 1 , further comprising:
 a second concrete access aperture passing through the body, the second concrete access aperture dimensioned and configured to allow semi-liquid concrete to pass therethrough.   
   
   
       6 . A method of casting concrete structures comprising the steps of:
 a) erecting a first concrete form side having an internal cross sectional width to make a concrete form;   b) providing at least one duct chair having a generally flat body and a first duct aperture passing through the body, the aperture having a first duct aperture diameter approximately equal to such first pre-stressing strand duct diameter, the generally flat body further having at least first and second alignment legs projecting from the body, the alignment legs and body dimensioned and configured to extend for a total width approximately equal to such cross sectional width of such concrete form, the body further having a first concrete access aperture passing through the body, the concrete access aperture dimensioned and configured to allow semi-liquid concrete to pass therethrough;   c) securing the at least one duct chair and a duct passing through the duct aperture into the concrete form; and   d) casting concrete into the concrete form.   
   
   
       7 . The method of casting concrete structures of  claim 6 , further comprising:
 e) placing a first mat of reinforcing steel members into the concrete form prior to securing the duct chair and duct into the concrete form.   
   
   
       8 . The method of casting concrete structures of  claim 6 , further comprising:
 f) placing the duct through the duct chair aperture prior to securing the duct chair and duct into the concrete form.   
   
   
       9 . The method of casting concrete structures of  claim 6 , further comprising:
 g) placing the duct through the duct chair aperture after securing the duct chair into the concrete form.   
   
   
       10 . The method of casting concrete structures of  claim 6 , further comprising:
 h) securing the duct chair in place using fasteners.   
   
   
       11 . The method of casting concrete structures of  claim 10 , wherein the fasteners further comprise one member selected from the group consisting of:
 wires, flexible fasteners of plastic/polymer, string, twine, rope, cable, screws, nails, brads, tacks, bolts, snap fasteners, hook-and-loop fabric, sleeves, and combinations thereof.   
   
   
       12 . The method of casting concrete structures of  claim 6 , further comprising:
 i) placing a second mat of reinforcing steel members into the concrete form after securing the duct chair and duct into the concrete form.   
   
   
       13 . The method of casting concrete structures of  claim 6 , further comprising:
 j) erecting a second concrete form side defining the internal cross sectional width between the first and second concrete form sides.   
   
   
       14 . The method of casting concrete structures of  claim 6 , further comprising:
 k) providing a first layer of steel plating in the form.   
   
   
       15 . The method of casting concrete structures of  claim 6 , further comprising:
 l) allowing the concrete to cure after pouring.   
   
   
       16 . The method of casting concrete structures of  claim 6 , further comprising:
 m) stressing the concrete casting after pouring.   
   
   
       17 . The method of casting concrete structures of  claim 16 , further comprising:
 n) stressing the concrete casting immediately after pouring.   
   
   
       18 . The method of casting concrete structures of  claim 16 , further comprising:
 o) stressing the concrete casting at a first time duration after pouring.   
   
   
       19 . The method of casting concrete structures of  claim 6 , further comprising:
 p) separating the concrete casting from the form.

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