Offset Guide Rails and Screed for Complex Shotcrete Contours
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Solution Overview
Problem
Conventional shotcrete construction methods lack precision and efficiency in creating complex, curvilinear, or exotic architectural designs due to imprecision and labor-intensive techniques, making it difficult to achieve desired aesthetics in architectural projects.
Innovation Solution
The use of guide rails placed in proximity to the shotcrete receiving surface, offset to allow uninterrupted spraying, combined with a screed that engages and traverses along the guide rails to remove excess shotcrete and impart a contour defined by the guide rail configuration, enabling precise and complex surface formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional shotcrete construction methods are used, then the construction process is simple and quick, but the precision and ability to create complex architectural designs are insufficient
Solution Approach 1:
Guide rails are introduced as intermediary elements between the shotcrete receiving surface and the screed. These rails serve as a mediating structure that defines the desired contour and guides the screed movement, enabling precise formation of complex architectural surfaces without requiring the shotcrete application process itself to be complex
Solution Approach 2:
The guide rails are installed in advance before shotcrete application, establishing the predetermined contour and path for the screed. This preliminary positioning of the rails allows the subsequent shotcrete and screeding operations to follow a pre-planned trajectory, achieving precision without complexity during the actual construction phase
2Manufacturing precision
If guide rods and wires are used to gauge shotcrete wall depth, then different thicknesses at different points can be achieved, but the process becomes extremely labor intensive and imprecise
Solution Approach 1:
The continuous guide rail structure is segmented into multiple rails positioned at different locations, each defining a specific contour. The screed is correspondingly segmented to engage with multiple rails simultaneously, allowing different thicknesses at different points to be achieved through a single continuous operation rather than manual adjustment at each location
Solution Approach 2:
The manual mechanical system of placing individual guide rods and tying wires is replaced with a more efficient mechanical system using continuous guide rails and a traversing screed. This substitution maintains the ability to create variable thickness profiles while dramatically reducing labor requirements and improving precision through the rigid, pre-positioned rail structure
3Shape
If extreme arcuate, curvilinear, or exotic characteristics are required, then the aesthetic needs may be met, but the amount of guide rods and labor required increases to the point where shotcrete advantages disappear
Solution Approach 1:
The guide rails are designed with inherent curvilinear and arcuate geometries that directly define the desired complex surface shapes. By forming the rails themselves in the required curved configurations, the system eliminates the need for numerous straight guide rods and manual shaping operations, as the rails' own geometry imposes the desired curvature on the shotcrete surface
Solution Approach 2:
The guide rail system serves multiple functions simultaneously: it defines the contour, guides the screed movement, establishes thickness variations, and creates complex architectural shapes. This multi-functionality consolidates what would otherwise require separate operations and numerous individual components into a single integrated system, maintaining shotcrete construction advantages even for extreme design requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly increases precision and speed in shotcrete construction, allowing for the creation of complex architectural designs that meet aesthetic needs, surpassing the limitations of conventional techniques.
Implementation Method 1
Shotcrete, which can refer to both the material and the construction technique itself, involves pneumatically projecting concrete or mortal at high velocity onto a surface
Data Source
AI summary
Systems and methods of shotcrete construction are contemplated whereby guide rails are placed in proximity and forward to a shotcrete receiving surface, with any guide rails disposed directly in front of the shotcrete receiving surface being configured to be offset from the receiving surface allowing shotcrete to be sprayed behind the offset guide rails. Following application of shotcrete, a screed configured to engage with and traverse along at least two of the guide rails may be used to rod the shotcrete via a protruding region of the screed extending beyond the guide rails, thereby removing excess shotcrete and imparting to the shotcrete surface a contour at least partially defined by the configuration of the guide rails and the configuration of the protruding region of the screed. Complex, precise, and even exotic architectural shotcrete installations may be created in this fashion by providing a suitable set of guide rails and screed.