The present disclosure relates to panel and plank construction, and more particularly, to a method for assembling a structure using panels and planks that are made of Aerated Autoclaved Concrete (AAC).
Aerated autoclaved concrete (AAC) is construction material made from: water, sand, cement, lime, and a small amount of a safe propriety. AAC is manufactured in components of hand-laid blocks, larger machine-laid blocks, wall panels, and floor and roof planks. Because of the physical properties of AAC components, the inherent costs to stage, assemble and reinforce these AAC components makes their use cost prohibitive in many structures—especially in residential home units and other structures in logistically challenged and remote locations: Areas which are in desperate need of an alternative to labor-intensive, costly, conventional wood-framed, metal framed, concrete block or other construction.
Disclosed is a method to construct and assemble an integral monolithic superstructure using panels and planks, where at least the panels, and optionally the planks, are made of aerated autoclaved concrete (AAC).
The method can include placing a first set of construction materials that include planks, panels, or planks and panels on a construction site to form one or more vertical walls of the integral monolithic superstructure; placing a second set of construction materials that include planks, panels, or planks and panels on a top edge of the first set of construction materials to form a horizontal surface of the integral monolithic superstructure; and casting one or more beams, corners, columns, toppings or combinations thereof, wherein each of the beams, corners, columns, topping, or combinations thereof is adjacent to at least one plank or panel of the first set of construction materials and at least one plank or panel of the second set of construction materials. The method can include, after placing the first set and prior to placing the second set, setting forms, struts, bracing, shoring, anchors, or combinations thereof at points along the first set of construction materials to hold the first set of construction materials in place.
The method can include, before placing the first set of construction material, manufacturing the first set of construction materials and the second set of construction materials. The method can include after manufacturing and prior to placing the first set, reverse staging of panels and planks on delivery transportation vehicles at the factory, and ends with cost-effective, low maintenance finishes of the installed materials. The intermediate steps/stages of; delivery, assembly, temporary safe shoring, forming of the internal/integral cast-in-place structural grout superstructure (the “Integral Monolithic Superstructure” or “IMS”), all combine to result in quick, safe, construction schedule and structure with properties that are far superior to conventional framing and cast in place concrete. The IMS can be developed, adapted, or conceptually designed for a more conducive application of the System. The AAC manufacturer can adjust their product characteristics (compressive strengths and internal reinforcing), and a structural engineer designs the “Integral Monolithic Superstructure” (“IMS”), to accommodate the performance standards of the structure. The planks and panels can be manufactured or factory-cut to standardized dimensions (but minimizing the number of unique dimensions) required for assembly, which eliminates the method of field cutting the planks and panels to fit. Standard sizing of the planks and panels also allows for the interchangeability of panels or planks. The panels and planks can be “reverse staged” (last loaded on the truck are the first set on site) on delivery vehicles so that (when construction site conditions permit), the panels and planks can be picked from the truck and set directly in place.
Prior to delivery of materials, an appropriately designed foundation or substructure (see below) is design and constructed. Forms and structural shoring/struts using the disclosed ties and connections, are set/erected in strategic locations, that serve two purposes: to function as forms for the cast-in-place structural grout/concrete mix for the IMS; and to plumb and temporarily and safely brace and shore the wall systems. This allows erection of the walls and floors, continuously without interruption, and without the typical use of a permanent external superstructure.
The panels are delivered, erected and attached to the structural forms and braced with properly designed shoring/struts with form ties, specifically designed “Panel Ties” and standard AAC fasteners. The panels can form one or more vertical forms of the IMS. Intermediate wall bracing/stiffeners/shoring/struts is installed at midspan locations where spans are long and wall panels are narrow and there is a possibility of wall buckling.
The planks are set on top of the walls being cognizant of bearing surface requirements. Temporary midspan shoring may be used for longer plank spans that utilize thinner planks where planks may deflect during construction. The deformed and post-tension reinforcing steel is set/installed and any miscellaneous detailing is completed. The planks can form a horizontal surface of the IMS.
Remaining wall and perimeter/ring beam forms and ties are installed. Thin panels can be installed as form liners for added insulation where dimensions accommodate them. Bond breaker and expansion joint materials may also be installed to arrest/isolate cyclical movement and mitigate panel cracking. Structural grout or small aggregate concrete is placed, consolidated/vibrated, finished, and allowed to cure to minimum required strengths. Roof pours are given a “crown” to allow proper drainage.
Forms, bracing, shoring, anchors, and struts are removed. Concrete is patched, an additional thin layer of cladding (e.g., AAC cladding) can be applied over exposed concrete to provide added insulation. The finished structure easily accepts durable, cost effective, long lasting finish, that can be quickly applied. The AAC can also accept traditional finishes like masonry, composite siding, and fully adhered veneer stone products.
Since the materials are durable, sustainable, inert, fireproof, and can resist higher wind loads than conventional residential construction, clean-up after a major destructive incident (flood, fire, storm, etc.), is relatively quick and inexpensive. Simply empty the space of belongings and collateral debris, shovel the remaining sediment, and using a high-volume water hose, rinse the structure clean (inside and out), wash the surfaces with a sanitizer, and dry to prepare for occupancy again. This has the potential to not only reduce the cost of insurance claims drastically, but may in some cases can prevent them.
Other technical features may be readily apparent to one skilled in the art from the following figures, descriptions and claims.
For a more complete understanding of this disclosure, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
Disclosed herein is a method to construct and assemble an integrated monolithic superstructure using panels and planks, where the panels, planks, or both panel and planks are made of aerated autoclaved concrete (AAC).
The method can include developing a structure that is conceptually designed for a more conducive application of the System. An assessment of purpose, required design criteria, space needs, etc. and the development of the conceptual design should be guided in a manner that is conducive the use of this system. If the design is already conceptually established, then a skilled, properly trained architect, engineer, qualified contractor, or AAC rep should assess the conceptual design and design criteria and make recommendations that render the use of the system more practical for the specific application.
The AAC manufacturer adjusts their product characteristics (compressive strengths and internal reinforcing requirements), the manufacturer can design material characteristics to meet thermal and compressive strength requirements for the building and local code criteria/standard. Top wall panels should have a higher compressive strength where needed to accommodate live and dead loads during construction activities. A structural design technician designs the IMS to accommodate the performance standards of the structure, the performance standards, and deflection criteria of the substructure to minimize failures or cracking. Bearing soils tests are always required.
The AAC planks and panels are manufactured in the factory, then cut to exact dimensions (but minimizing the number of unique dimensions) required for assembly to eliminate the process of field cutting to fit. Standard sizes can be used, which also allows for the interchangeability of panels or planks. Pre-cutting to exact lengths at the factory allows for fashioning panels/planks in an environment with the facilities to perform fashioning quicker and more efficiently. Pre-cutting also allows the field erectors to work quickly and without delays caused by custom field cuts. Limited Uniform sizes, consistent with typical residential room dimensions, allow for easy staging on delivery vehicles, easy interchangeability of damaged or missing panels/planks, and easy coordination at the jobsite. Limited Uniform sizes also allows AAC distributors to stock panels and planks, which would otherwise be considered “custom manufactured” and potentially eliminate delays caused by remanufacturing of damaged or missing panels and planks.
Panels and planks are “reverse staged” (last loaded on the truck are the first set on in place on site) on delivery vehicles so that, when construction site conditions permit, panels and planks can be picked from the truck and set directly in place. AAC is a low strength concrete that is damaged relatively easily. Repairs can be made but take time and cause delays. Reduced handling means a reduced risk of damage and delays. Moving materials multiple times takes time and causes delays. Reverse staging on delivery vehicles mean products can be set in place right from the delivery vehicles, eliminating delays caused by staging materials multiple times, and the cost of repairing damage caused by excessive handling. Dual tandem, short-wheel-based, soft-ride trailers allow delivery to areas where road access is tight (such as residential neighborhoods) because one trailer can be dropped, while one is delivered, and minimizing damage from transport.
Prior to delivery of components an appropriate design foundation or substructure is constructed. AAC is non-ductile—it will only accommodate a minimum amount of deflection before it cracks, this is especially true for wall panels. The performance standards and deflection criteria of the substructure should be such that it minimizes failures or cracking. Bearing soils tests are always required to determine substructure design criteria. Additionally, bond-breaking materials and thin expansion joint materials are used in strategic locations. These materials help arrest and isolate potential movement throughout the IMS wall system. They also mitigate cracking caused by the thermal expansion and contraction differentials of the different materials.
Prior to placing any wall panels, vertical wall forms are erected at strategic locations (corners, mid-wall integral columns, and as mid span bracing to prevent buckling on longer wall spans). They are set, braced, and plumbed using a combination of rigid or cable struts and shores, and specially designed ties and connections 205. Shoring and braces are anchored to the substructure or flooring system using properly designed removable anchors, or adjacent wall panels. These forms and braces serve two purposes: to function as forms for the cast-in-place structural grout/concrete mix for the IMS, and to plumb and temporarily and safely brace and shore the wall systems, and allows for planks to safely bear on panel walls. The forms and braces hold the panels in an arrangement that is in accordance with the floor plan. One of the key factors of the system is the monolithic casting of the entire Internal/Integral Monolithic Structure Superstructure at one time. The forms “sandwich” the ends of the panels (one form on the outside face and one on the inside face) and are held in place with “through-wall” “form ties” at each horizontal panel joint. The form ties can be re-usable or disposable snap ties, or re-usable She-Bolt, Wing-Nut or other removable through wall or sleeved tie. The forms are specifically designed with elongated and oversized “form tie” holes at panel joint locations to accommodate a limited amount of field tolerance deviations, and to allow the walls to be re-plumbed after the panels are in erected. This is important because the floor and roof planks can be cut to size at the factory, and the bearing requirements for the end of the panels is specific. Field adjustment capabilities are needed to make sure that the distance between the tops of the bearing walls is exact. Plumbing, temporarily and safely bracing, and shoring the wall systems allows erection of the wall panels and floor planks continuously without interruption, and without the use and cost of a permanent external superstructure. As shown in
Specific pre-erection tasks are undertaken to prepare the area. Wall panels 101 are tongue and groove to allow precise edge-to-edge fit and alignment. Some field fashioning and panel prep is required to accommodate the form ties 103 that pass through the walls at the panel joints 203, and “panel ties” 805 that connect panel ends to adjacent panels or to the integral column. Wall panels 101 arrive at the job site, reverse staged on delivery vehicles. The preferred method is to set the panels 101 and planks 1201 directly from a truck even if it requires using 2 cranes to expedite unloading. Not all site conditions will allow this. The wall panels 101 can be set on edge horizontally, with a gap of 6″-10″ between the ends of the panels. This “gap” can eventually form the integral column element 307 of IMS (see
The vertical structural forms 401 have form ties 103 at four locations at each panel joint 203 and additional locations on walls that require intermediate “anti-buckling” bracing (see
Once panel setting & erection (preliminary cutting, pre-drilling, trimming, etc.) for the “panel ties” 805, form ties 103 & anchors/fasteners 1301 has been completed, and a “panel tie” 805 is connected to one end of the panel 101, the panel 101 is hoisted to its final placement location in the system. Another worker can receive and guide the panel into place. That same worker can also: install form ties 103 at the ends of the panels; install form ties 103 at the locations of the intermediate “anti-buckling” bracing where needed; attach the loose end of the “panel tie” 805 on this panel 101, to the previously set panel on the opposite side of the “gap”; top panel—install “form tie” or perforated strap or sleeve for removable/reusable form tie; secure the outer form ties 103 with compatible form-tie ends (wale, wing nuts, or other base that allows minor adjustment and minor wall width fluctuations); secure and tighten the “form tie” 103 on the lower edge of the wall panel; install intermediate “anti-buckling” bracing/stiffeners 401/shoring struts 107/anchors 109 at midspan locations when/where there is a possibility of wall buckling (see
Floor plank erection and setting may be seen in
The deformed and post-tension reinforcing steel is set/installed and any miscellaneous detailing is completed. Lay and chair reinforcing per that manufacturer's and/or structural engineer's requirements. Install perimeter reinforcing steel in the perimeter beams. Lay WWF if there is any possibility that the concrete topping 1705 may develop cracks. Reinforce openings as detailed by engineer. Install other imbedded devices, shoring/bracking anchors, davits, etc.
Remaining wall perimeter beam forms are installed. Fastener cleats 1303 on the face of the walls a distance below the top edge of the walls to support the perimeter beam form boards (as seen in the sectional view of
One or more additional levels can be added to the building by repeating the above steps with further sets of planks and panels on top of the first level built. Additional levels can be the same size as the first level or a different size. If the additional level is the same size as the first level, the additional level walls can be placed at the point where the first level vertical walls meet the horizontal surface formed by the planks.
Place structural grout or small aggregate concrete mix. Consolidate, vibrate, and finish per engineering requirements. Allow concrete to cure to minimum required strengths. Mix strength of the concrete may be determined by the engineer. Roof pours are given a “crown” and slope of approximately 1/16″ to ⅛″ per ft to allow proper drainage.
Forms, bracing, shoring, removable anchors and struts are removed. Concrete is patched, additional thin AAC cladding is applied over exposed concrete to provide added insulation and a uniform surface for applied finishes.
Although the present disclosure and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
This application is a non-provisional of and claims priority to U.S. Provisional Patent Application No. 63/202,683 filed on Jun. 21, 2021, which is incorporated by reference in its entirety.
Number | Date | Country | |
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63202683 | Jun 2021 | US |