Embodiments of the present technology generally relate to the manufacture of concrete products. Certain embodiments of the present technology relate to movable pallets and methods of use during the manufacture of pre-stressed concrete products.
Pre-stressed concrete products can be used in the construction of homes and/or other structures, for example. Such products can include tensioned strands that can reinforce the concrete. Pre-stressed concrete products can be fabricated by providing materials in forms and allowing the materials to cure.
Certain known systems and methods relating to the manufacture of pre-stressed concrete products are described, for example, in:
Seppanen et al. U.S. Pat. No. 6,841,110 issued on Jan. 11, 2005;
Longo U.S. Pat. No. 6,773,650 issued on Aug. 10, 2004;
Tadros et al. U.S. Pat. No. 6,668,412 issued on Dec. 30, 2003;
Thim U.S. Pat. No. 6,155,810 issued on Dec. 5, 2000;
Manning U.S. Pat. No. 5,976,442 issued on Nov. 2, 1999;
Yokota U.S. Pat. No. 5,342,568 issued on Aug. 30, 1994;
Schuerhoff et al. U.S. Pat. No. 5,114,653 issued on May 19, 1992;
Kitzmiller U.S. Pat. No. 4,953,280 issued on Sep. 4, 1990;
Cazenave et al. U.S. Pat. No. 4,758,393 issued on Jul. 19, 1988;
Grossman U.S. Pat. No. 4,493,177 issued on Jan. 15, 1985;
Borcoman U.S. Pat. No. 4,421,710 issued on Dec. 20, 1983;
Rieve U.S. Pat. No. 4,245,923 issued on Jan. 20, 1981.
Improved systems and methods for use in the manufacture of pre-stressed concrete products that can increase efficiency and/or reduce cost, for example, are desirable.
Certain embodiments of the present technology provide systems and methods that can be used during fabrication of concrete products.
In certain embodiments, for example, a movable pallet for use in fabrication of a concrete product can include a gate and a bottom panel that includes an upper surface. The gate can be disposed at an end of the bottom panel. The gate can be movable between a first position and a second position. In the first position, the gate can extend vertically relative to the upper surface of the bottom panel. In the second position, the gate can extend away from the end of the bottom panel.
In certain embodiments, for example, a method for fabricating a pre-stressed concrete product can include: securing a strand to a first gate; extending the strand through a form configured to receive concrete; elongating the strand; securing the strand to a second gate; and providing concrete into the form.
The foregoing summary illustrates examples of embodiments of the present technology. It should be understood, however, that the present invention is not limited to the embodiments described in the summary.
The foregoing summary, as well as the following detailed description of embodiments of the present invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, certain embodiments are shown in the drawings. It should be understood, however, that the present invention is not limited to the arrangements and instrumentality shown in the attached drawings.
Below is a detailed description of embodiments depicted in
In certain embodiments, for example, the panels 102, 104, 106 can be made of steel and/or other materials with similar properties. In certain embodiments, for example, the bottom panel 102 can provide 40 feet by 12 feet of usable space. In such embodiments, a concrete product that is 40 feet by 12 feet can be fabricated. In certain embodiments, for example, the bottom panel 102 can provide less or more usable space.
In the embodiment shown in
In the embodiment shown in
In the embodiment shown in
In certain embodiments, for example, the strands 114 can be tensioned using rams in connection with a hydraulic pump. In such embodiments, the rams can pull the strands 114 away from a first end of the pallet 100 until a desired strand tension is achieved. The ram can release the strands 114, which are then held in place (at the desired tension) by chucks 116 on both ends of the pallet 100. In certain embodiments, a plurality of rams can be used to simultaneously tension a plurality of strands.
In certain embodiments, for example, a strand can be tensioned to 33,000 pounds of tension. In certain embodiments, for example, a strand can be tensioned to a different tension. In certain embodiments, for example, a strand can be over-tensioned. In such embodiments, releasing the strand can result in a drop of tension before the strand is held in place by the chuck. In such embodiments, the amount of over-tensioning can equal the drop in tension that occurs when the ram releases the strand in order to provide the desired tension.
In certain embodiments, for example, up to twenty-two strands can be attached to a pallet. In certain embodiments, for example, a different number of strands can be attached to a pallet. In certain embodiments, such as the embodiment shown in
In the embodiment shown in
In certain embodiments, for example, the rods can be made of steel and/or other material(s) with similar properties. In certain embodiments, such as the embodiment shown in
In the embodiment shown in
In certain embodiments, for example, using lifts and tracks in combination with rollers can provide for movement of a pallet among a plurality of workstations. In certain embodiments, for example, improved mobility can provide increased efficiency and/or reduce costs in a manufacturing environment.
In the embodiment shown in
In the embodiment shown in
In certain embodiments, for example, using end gates that are pivotal relative to a pallet can provide for better access to the bottom panel and/or side panels of the pallet, thereby allowing cleaning equipment improved access to such areas, for example. Such improved access can provide increased efficiency and/or reduce costs in a manufacturing environment.
In certain embodiments, for example, using a counter-tensioned pallet can allow for larger pallets to be movable about a manufacturing facility, thereby allowing larger pre-stressed concrete products to be fabricated in such an environment, which can provide increased efficiency and/or reduce costs, for example.
Embodiments of the present technology also provide methods for fabricating pre-stressed concrete products. In certain embodiments, for example, the systems described above in connection with
In an embodiment, for example, a method for fabricating pre-stressed concrete products using a pallet with a plurality of gates pivotally attached to the ends of the pallet can include: (1) securing each gate in a position that is substantially parallel to an end of the pallet; (2) securing end panels that include vertical plates to a bottom panel of the pallet, for example, using magnets, such that the vertical plates are substantially parallel to an end of the pallet and provide a form between themselves and side panels of the pallet; (3) securing side panels that include vertical plates to a bottom panel of the pallet, for example, using magnets, such that the vertical plates are substantially parallel to a side of the pallet and provide a form between themselves and the end panels; (4) providing a plurality of strands through a plurality of openings in a first gate; (5) securing the strands to the first gate, for example, using a plurality of chucks; (6) providing the strands through a corresponding plurality of openings in a first vertical plate; (7) providing the strands through a corresponding plurality of openings in a second vertical plate; (8) providing the strands through a corresponding plurality of openings in a second gate; (9) tensioning the strands by elongating the strands; (10) securing the strands to the second gate, for example, using a plurality of chucks; (11) removing excess strand material, for example, by cutting the strands beyond the end of the chucks; (12) providing wet concrete into the form; (13) providing wire mesh into the form; (14) providing more wet concrete into the form; (15) providing an insert, for example, a foam insert into the form; (16) providing more wet concrete into the form; (17) providing more wire mesh into the form; (18) providing more wet concrete into the form; (19) allowing the concrete to cure, for example, for eight hours; (20) removing the chucks; (21) pivoting each gate to a position that extends away from the nearest end of the pallet; (22) removing all vertical plates that are secured to the bottom panel of the pallet; (23) removing the concrete product from the form; and (24) cleaning the bottom and side panels of the pallet, for example, using manual labor and/or a cleaning machine(s).
In certain embodiments, for example, a method for fabricating pre-stressed concrete products can also include moving the pallet between a plurality of stations where one or more of the above-recited steps can be performed. For example, in certain embodiments, the pallet can be moved using rollers and/or lifts as described, for example, in connection with
In certain embodiments, for example, a method for fabricating pre-stressed concrete products can omit one or more of the steps recited above and/or perform the steps in a different order than the order listed. For example, some steps may not be performed in certain embodiments. As a further example, certain steps may be performed in a different temporal order, including simultaneously, than listed above.
While particular elements, embodiments and applications of the present invention have been shown and described, it will be understood, that the invention is not limited thereto since modifications can be made by those skilled in the art without departing from the scope of the present disclosure, particularly in light of the foregoing teachings.
This application claims priority to U.S. Provisional Application No. 61/225,557 filed Jul. 14, 2009, entitled “MOVABLE PALLET AND METHOD OF USE,” which application is incorporated by reference herein in its entirety.
Number | Date | Country | |
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61225557 | Jul 2009 | US |