Expandable Braced Structure

Description Building structures are typically built by lifting relatively small components from ground level and fixing them above previously placed components. However, substantial time and cost savings are often achieved by using methods that are more systematic than is typical. Some of these methods assemble more components near ground level. The components are then lifted as relatively complete assemblies to final positions. One such method, commonly referred to as the “lift slab method”, is constructed by forming concrete slabs in a stack near ground level. Using this method, each slab is threaded through columns, and the slabs are lifted with column-mounted jacks to final spaced-apart positions. Most known lift-slab methods have limitations and drawbacks. They include high cost, complexity, unreliability and unsuitability to a variety of building forms.

David Rockwood, Associate Professor of Architecture at the University of Hawaii, has an invention that improves upon existing lift slab methods. Mr. Rockwood’s invention is a structure, and a method for forming or assembling the components of such structure, principally near ground level, and lifting, and thereby expanding the structure to a final, in-place permanent form. In this invention, vertical load bearing element or elements (that are also capable of resisting lateral loads) are formed first to full height. This element or these elements are used as the supports to lift preformed floor structure elements (which may also carry other construction elements intended for that floor along with the floor during lifting). The deployment process provides for permanent lateral load resistive elements to be used as temporary construction bracing. This provides higher degrees of construction stability and safety.

Applications Low rise, mid-rise and high-rise buildings, with a variety of floor plate sizes and configurations Main Advantages Adaptability: Applicable to many types of site conditions, and to many building and structure types. Can employ a variety of material and component configurations. Shortened Construction Period: Many components may be fabricated off-site concurrently with on-site operations. Components fabricated on-site are highly systemized. Reduction in the number of redundant operations. Allows most operations to be performed at or near ground level. Greater Safety: Lifting system uses tested equipment and may employ redundant computer control with manual override capability. Mechanical braking/locking devices may be used as redundant backup to other systems. Allows most operations to be performed at or near ground-level, minimizing hazards of working at elevated positions, and allowing the work to be performed under climate controlled conditions. Avoids repetitive disengagements and reengagements of the lifting system. Provides lateral load resistive bracing throughout the construction sequence, ensuring stability. Structural Efficiency: Allows a variety of means to resist lateral loads, including placing bracing at the periphery. May utilize a variety of material and construction types, including efficient/cost effective post-tensioned concrete slabs, and composite steel tube/concrete columns. Cost Savings: Shortened construction period reduces financing costs and allows earlier space sales/leasing. Decreases labor costs through systemized and repetitive operations. Uses cost effective materials/structural components, allows for efficient overall structural forms that cooperate with architectural requirements and other building system requirements.

Type of Offer: Licensing

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