Static structures (e.g. – buildings) – Intersection of a cast stonelike component – Cast reinforced vertical and horizontal members
Reexamination Certificate
2000-03-27
2001-09-25
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Intersection of a cast stonelike component
Cast reinforced vertical and horizontal members
C052S250000, C052S431000, C052S429000, C052S340000, C052S252000
Reexamination Certificate
active
06293063
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a building system including a concrete precast form used as leave-in-place formwork for constructing cast-in-place concrete columns and beams for mid-rise and high-rise buildings located in both non-seismic and severe seismic areas.
BACKGROUND OF THE INVENTION
Conventionally, cast-in-place (or poured-in-place) concrete beams and columns are poured in wooden forms. After the beams and columns sufficiently cure, the wooden forms are removed and discarded, creating a large amount of wasted lumber. Furthermore, such wooden forms require extensive bracing and shoring. This method is also very time consuming, labor intensive and requires a large amount of on-site cast-in-place concrete.
Prior precast concrete leave-in-place forms have been inefficient due to the lack of shear transfer between the precast concrete of the leave-in-place form and the poured concrete therein. Without the complete composite bond and shear transfer between the precast concrete form and the cast-in-place concrete therein, the combination is inefficient and uses excessive amounts of concrete and steel reinforcing.
SUMMARY OF THE INVENTION
Accordingly, a primary object of the subject invention is to provide a building system including an elongated U-shaped precast concrete leave-in-place form having shear keys spaced apart along the length of the form that provide sufficient shear transfer between the precast concrete of the form and cast-in-place concrete poured therein resulting in a truly composite structure.
Another object of the subject invention is to provide a building system including a precast concrete form which eliminates extensive forming, shoring and waste.
Still another object of the subject invention is to provide a building system including a precast concrete form that reduces the amount of cast-in-place concrete that is required.
Yet another object of the subject invention is to provide a building system including a precast concrete form that decreases construction time and is less labor intensive.
A further object of the subject invention is to provide a building system including a precast concrete form that produces a high quality precise building frame and is aesthetically pleasing during construction.
Still further object of the subject invention is to provide a building system employing precast waffle panels as flooring which provide the composite structural floor which is intimately married to the concrete beam and column structure during pouring of the cast-in-place concrete of this hybrid system.
Yet a further object of the subject invention is to provide a building system employing precast column forms that present half-column shells having reinforcing stirrup ties cast therein which extend outwardly from each form so that when two forms are joined together into a shell, the stirrup ties of each form overlap and interlock with the cast-in-place concrete to form a unified column.
Yet a further object of the subject invention is to provide a building system having columns to which the only added reinforcing required is that used to tie one column level to the next through the beam/floor section.
These objects are attained by providing a concrete form including a form body having a channel through a length thereof and a shear bonding key along the length, the channel being adapted to receive cast-in-place concrete therein to form a beam or column. The shear bonding key is integrally formed in the body and has a grooved portion and a ribbed portion for bonding the cast-in-place concrete to the form body. The form body may further include a reinforcing stirrup tie cast therein and extending into the channel, adapted to secure the form body to an opposed form body. The form body may include a plurality of shear bonding keys and reinforcing stirrup ties spaced apart along the length thereof.
Additionally, these objects may be attained by providing a method of forming a concrete cast-in-place beam or column, including the steps of positioning a pre-cast concrete form having a channel extending therethrough, pouring the cast-in-place concrete into the channel of the form, and bonding the concrete to the form with a shear bonding key integrally formed along the channel of the form. This method may further include the step of securing opposed forms together with a reinforcing stirrup tie extending from the forms into the cast-in-place concrete.
Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawings, wherein is set forth by way of illustration and example, an embodiment of this invention.
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A Phi Dieu Tran
Chase & Yakimo, L.C.
Friedman Carl D.
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