Patent Application
20230226718
The present invention generally relates to modular earth retaining walls, and more particularly, to an adjustable mold for producing precast concrete top panels, or top units or blocks, having varying geometries for use in a modular earth retaining wall, for example but not limited to, a modular mechanically stabilized earth (MSE) retaining wall.
Modular earth retaining walls with concrete panels are commonly used for architectural and site development applications. Such walls are subjected to very high pressures exerted by lateral movements of the soil, temperature and shrinkage effects, and seismic loads.
In many commercial applications, for example, along or support basing highways, etc., each concrete panel can weigh between two and five thousand pounds and have a front elevational size of about eight to ten feet in width by about five feet four inches in height.
Most often, the earth retaining walls of this type are reinforced. A conventional mechanically stabilized earth (MSE) retaining wall with steel or polymer belt reinforconcrete is typically reinforced with steel strips or welded wire meshes that extends backward, or perpendicular, from the rear of a concrete panel to reinforce the backfill soil.
Typically, molds are used to manufacture modular precast concrete panels for the MSE retaining walls. The top panels can be made with varying geometries, i.e., varying angles along the upper portion of the concrete top panel and heights on each side of the top panels to accommodate a final grade or roadway alignment above the MSE retaining wall. The customary production of top panels in the industry today involves custom forming the top panels by manually blocking out a normal or standard rectangular panel mold with wood so that differing angles can be created to follow grade or roadway alignment above and along the top of the MSE retaining wall. This process is undesirably costly, labor intensive, and time consuming, often leads to top panels that are not adequately smooth or inaccurate on the surface(s). Also, to cover up the unsightly wood formed angles, a coping is required to cover up the irregularities.
The present disclosure provides various embodiments of an adjustable mold for producing precast concrete top panels, or top units, that have varying geometries, or shapes and/or sizes, for use in a modular earth retaining wall, for example but not limited to, a modular mechanically stabilized earth (MSE) retaining wall.
First, one embodiment, among others, is an adjustable precast concrete top panel mold for forming a precast concrete top panel for a modular retaining wall. The mold has a support base with a top surface, bottom surface, and surrounding periphery. A plurality of rails is mounted to the support base and upstand generally perpendicular from the support base. The rails are collectively attached together to form a closed lateral side boundary with an open top designed to receive liquified concrete. The support base and rails are designed to form sides of the precast concrete top panel. The rails can be adjusted to change a geometric shape associated with the closed lateral boundary in order to enable production of different top panels having different lateral boundaries, and therefore different geometries.
Second, another embodiment, among others, is a method for forming a precast concrete top panel for the modular retaining wall. The method can be broadly summarized as follows: providing a mold as defined in the last paragraph; situating the mold so that the bottom surface of the support base is generally horizontal; introducing the liquified concrete into the mold from a generally vertical direction onto the top surface of the support base and against each of the plurality of rails; permitting the concrete to solidify; removing the rails, in whole or in part, in order to remove the top panel; and removing the top panel from the support base.
Third, another embodiment, among others, is an adjustable precast concrete top panel mold for forming a precast concrete top panel for a modular retaining wall. The mold has a generally planar, panel back forming, support base with a top surface, bottom surface, and surrounding periphery, the top surface designed to form a front side of the top panel.
An elongated, panel bottom forming rail with an elongated body extends between opposing ends. The rail extends upwardly in a generally perpendicular manner from the top surface of the panel back forming support base. The elongated body having a bottom concrete contact surface is designed to form a bottom side of the top panel.
An elongated, panel left side forming rail with an elongated body extends between opposing ends. The rail extends upwardly in a generally perpendicular manner from the top surface of the panel back forming, support base. The left side forming rail is extendable and retractable between the first and second ends. The elongated body has a left side concrete contact surface designed to form a left side of the top panel.
An elongated, panel right side forming rail with an elongated body extends between opposing ends. The rail extends upwardly in a generally perpendicular manner from the top surface of the panel back forming support base. The right side forming rail is extendable and retractable between the opposing ends. The elongated body has a right side concrete contact surface designed to form a right side of the top panel. The right and left side concrete contact surfaces are generally parallel.
An elongated, panel top side forming rail with an elongated body extends between opposing ends. The rail extends upwardly in a generally perpendicular manner from the top surface of the panel back forming support base. The top side forming rail is extendable and retractable between the opposing ends. The elongated body has a top side concrete contact surface designed to form a top side of the top panel. The panel top side forming rail is adjustably attached to the panel left side forming rail so that a first angle between the left side and top side concrete contact surfaces can be changed. Moreover, the panel top side forming rail is adjustably attached to the panel right side forming rail so that a second angle between the right side and the top side concrete contact surfaces can be changed.
In this embodiment, a combination of the support base and the rails creates an open top cavity for receiving concrete and for defining a substantial part of an outer shape associated with the precast concrete top panel.
Fourth, another embodiment, among others, is a method for forming a precast concrete top panel for the modular retaining wall. The method can be broadly summarized as follows: providing a mold as defined above; situating the mold so that the bottom surface of the panel back forming support base is generally horizontal; introducing liquified concrete into the mold from a generally vertical direction onto the top surface of the panel back forming support base and against the rails; permitting the concrete to solidify; removing the rails; and removing the top panel from the panel back forming support base.
Fifth, another embodiment, among others, is a mold for forming a precast concrete top panel for a modular retaining wall, the top panel being generally planar with front, back, left, right, top, and bottom sides. The mold has a support base with a top surface, bottom surface, and surrounding periphery. The top surface is designed to form a front side of the precast concrete top panel. The mold further includes an adjustable barrier mechanism for establishing an upstanding, concrete contact barrier on the top surface of the support base. The barrier has lateral sides that are designed to form the left, right, top, and bottom sides of the precast concrete top panel. The barrier has an opening for receiving liquified concrete. The barrier is designed to be separable from the concrete once solidified.
Sixth, another embodiment, among others, is a method for forming a precast concrete top panel for the modular retaining wall. The method can be broadly summarized as follows: providing a mold as defined in the previous paragraph; situating the mold so that the bottom surface of the support base is generally horizontal; introducing liquified concrete into the mold from a generally vertical direction onto the top surface of the panel back forming support base and against the barrier; permitting the concrete to solidify; removing the barrier; and removing the top panel from the support base.
Other embodiments of molds and methods, apparatus, systems, methods, features, and advantages of the present disclosure will be or become apparent to one with skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional embodiments, apparatus, systems, methods, features, and advantages be included within this description, be within the scope of the present disclosure, and be protected by the accompanying claims.
Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
As shown in
To show extreme examples of possible requisite geometries of the top panels 2, a first example of a possible top panel 2 in an MSE retaining wall 6 is illustrated in
The adjustable mold 1 generally uses a modified conventional precast mold setup that allows elongated, panel left and right side forming rails 7a, 7b to slide and move up and down at varying distances to allow differing top panel side heights and angles to be created without the undesirable use of wood block outs or custom forming along the top edge. A plurality of elongated slot apertures, 8 enable the rails 7a, 7b to be attached to the generally planar, support base with flexibility via conventional bolt attachment mechanisms 9 (threaded bolt with suitable nut(s)). Other types of attachment mechanisms are possible. The elongated slot apertures 8 allow different heights on the left and right sides, which results in varying angles along the top portion of the panel 2 to be created.
An elongated, panel top side forming rail 10 is attached to each side rail 7a, 7b. More specifically, the panel top side forming rail 10 is adjustably attached to the panel left side forming rail 7a so that a first angle between the left side and top side concrete contact surfaces can be changed (i.e., between the panel left side forming rail 7a and panel top side forming rail 10). The panel top side forming rail 10 is adjustably attached to the panel right side forming rail 7b so that a second angle between the right side and the top side concrete contact surfaces can be changed (i.e., between the panel right side forming rail 7b and the panel top side forming rail 10). The combination of the underlying support base 13 and the rails 7a, 7b, 10, 12 creates a cavity with an open top for receiving liquified concrete and for defining an outer shape associated with the precast concrete top panel as the concrete solidifies.
In the preferred embodiment, each of the panel left side forming rail 7a and the panel right side forming rail 7b and the two opposing ends of the panel top side forming rail 10 have a rectangular, outwardly extending, attachment tab 14 having an elongated slot aperture 15. A first bolt attachment mechanism 16 with a bolt extends through slot apertures 15 of and connecting the panel left side forming rail 7a to the panel top side forming rail 10. A second bolt attachment mechanism 17 with a bolt extends through apertures 15 of and connecting the panel right side forming rail 7b to the panel top side forming rail 10.
In alternative embodiments, the rails 7a, 7b can be hingedly attached to the rail 10 via suitable hinges (not shown) in order to enable the required adjustment and movement of the rails 7a, 7b, and 10.
The side rails 7a, 7b and top rail 10 are movable on top of an underlying liner 11. The liner 11 is an optional feature. In the preferred embodiment, the liner 11 is made of rubber. The rubber liner 11 is used inside the top panel mold 1 on top of the generally planar support base 13 in order to create a surface texture, e.g., an impression of stone, brick, block, fractured fin, or whatever aesthetics the owner or architect desires. A bottom rail 12 is attached to the panel back forming, support base 13 and/or to the rails 7a, 7b, which allows the liner 11 to be aligned with the top panel 2 below and adjacent to the top panel 2 being truncated at the top at varying angles and heights.
In the preferred embodiment, the periphery of the support base 13 extends in a planar direction beyond the top rail 10 so that many differences in the angles 3 and heights 4 can be accomplished while enabling the support base 13 to entirely cover and extend between the panel bottom side forming rail 12 and the panel top side forming rail 10.
In order to use and operate the adjustable mold 1 for forming a precast concrete top panel 2 (
In the preferred embodiment, the rails 7a, 7b, 10, 12 and support base 13 are made of steel, but could be made of other suitable materials provided that there is sufficient rigidity for serving as a concrete forming barrier. Moreover, the liner 11 is made of rubber to enable application of texturing, but use of other suitable materials is also possible.
It should be emphasized that the above-described embodiments of the present invention, particularly, any “preferred” embodiments, are merely possible nonlimiting examples of implementations, merely set forth for a clear understanding of the principles of the invention. Many variations and modifications may be made to the above-described embodiment(s) of the invention without departing substantially from the spirit and principles of the invention. All such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention.
