Precast Rain Screen Panel with Shear Connectors and Drainage
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Solution Overview
Problem
Conventional building wall construction methods face challenges in managing moisture and ensuring ideal concrete curing conditions, leading to potential voids and reduced strength in vertical concrete pours.
Innovation Solution
A pre-fabricated rain screen wall panel design featuring inner and outer concrete panels, an intermediate drainage panel with channels for water evacuation, insulation, a vapor barrier, and shear connectors to secure the panels together, allowing for factory assembly and installation on standard foundations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If concrete is poured vertically into a mould at the building site, then the wall structure can be formed on-site, but voids are created in the concrete reducing its strength
Solution Approach 1:
The wall panel is divided into multiple horizontal layers of concrete that are cast sequentially in a horizontal mould. This segmentation allows each layer to be poured and cured properly without creating voids, while still enabling on-site assembly of the complete wall panel.
Solution Approach 2:
The concrete layers are cast and cured in advance in a controlled factory environment before installation at the building site. This preliminary action ensures ideal curing conditions and eliminates voids, while the pre-fabricated panel can still be installed on-site to complete the wall construction.
2Ease of manufacture
If wall panels are assembled at the building site, then construction can proceed with standard materials, but moisture management becomes difficult and concrete curing conditions are not ideal
Solution Approach 1:
The concrete panels are cast and cured in a controlled factory environment before installation. This preliminary action ensures ideal curing conditions and proper moisture management during the critical concrete setting process, eliminating the problems of on-site moisture control while using standard construction materials.
Solution Approach 2:
An intermediate drainage panel is introduced between the inner and outer concrete panels. This intermediary component provides dedicated moisture management and drainage functionality, separating the moisture control function from the structural concrete panels and enabling reliable performance.
3Strength
If pre-fabricated panels are manufactured in a factory, then concrete can cure under ideal conditions and voids are reduced, but the panel design becomes more complex with multiple intermediate layers
Solution Approach 1:
The wall panel is segmented into distinct functional layers: inner concrete panel, intermediate drainage panel, intermediate insulation panel, and outer concrete panel. Each layer performs a specific function, and the segmentation allows for simplified manufacturing of each component in the factory before assembly.
Solution Approach 2:
The intermediate drainage panel serves multiple functions: it provides moisture management, structural support, and a form for the rain channels. This multi-functionality reduces the need for separate components and simplifies the overall design despite the increased number of layers.
4Object-affected harmful factors
If drainage channels are added to the intermediate panel, then water evacuation is improved, but the panel structure becomes more complex
Solution Approach 1:
The drainage channels are merged directly into the intermediate drainage panel as an integrated feature rather than separate components. This combining of the drainage function with the structural panel simplifies the overall system while effectively managing water evacuation through the channel network.
Data Source
AI summary
A prefabricated rain screen wall panel is provided comprising inner and outer concrete panels secured together by shear connectors. Intermediate members provide insulation, a drainage channel and a vapor barrier.