Corrosion-Resistant Dowel for Concrete Formwork
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Solution Overview
Problem
Existing concrete formwork systems often use metallic dowels that are prone to corrosion, leading to potential failures and deterioration in appearance, while also being costly.
Innovation Solution
A formwork system featuring a corrosion-free dowel made from non-metallic materials such as polymers, and a support bracket with a locking mechanism to secure the system to the ground, along with a sleeve for the dowel that clips onto the formwork.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic dowels are used in the formwork system, then the structural strength and load-bearing capacity are improved, but the dowels are prone to corrosion leading to failure and deterioration of appearance
Solution Approach 1:
The patent employs composite material construction for the formwork panels, combining high-density polyethylene (HDPE) panels with integrated aluminum extrusion rails. This composite structure leverages the corrosion resistance and flexibility of HDPE while utilizing the structural strength and rigidity of aluminum, thereby resolving the contradiction between strength and corrosion resistance. The aluminum rails provide the necessary load-bearing capacity while the HDPE panels eliminate corrosion concerns associated with fully metallic construction.
Solution Approach 2:
The patent changes the material parameter of the dowels from metallic to non-metallic (HDPE). This parameter change eliminates the corrosion issue inherent in metallic materials while maintaining sufficient structural strength through the properties of high-density polyethylene. The HDPE dowels provide the necessary load-transfer capability across expansion joints without suffering from corrosion-induced failure.
2Force
If metallic dowels are used in the formwork system, then the load transfer between adjacent panels is improved, but the cost increases due to corrosion protection requirements and replacement needs
Solution Approach 1:
The patent changes the material parameter of dowels and formwork components from metallic to non-metallic (HDPE). This parameter change eliminates corrosion-related costs including protective coatings, maintenance, and premature replacement, while maintaining load transfer capability through the mechanical properties of high-density polyethylene. The HDPE material provides sufficient strength for load transfer across expansion joints without the additional costs associated with corrosion protection.
3Stability of the object's composition
If the support bracket is designed with a locking mechanism to secure the formwork panel, then the stability and position control are improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical locking systems with a simpler stabilization mechanism. The support bracket includes a stabilization member that extends through an opening in the formwork panel and engages with the ground or underlying surface. This simplified mechanical engagement provides sufficient position stability without the complexity of multi-component locking mechanisms, achieving stability through direct ground engagement rather than intricate locking systems.
Data Source
AI summary
A formwork panel for forming adjacent concrete bodies, wherein the formwork panel is adapted to be compressible on expansion of the concrete bodies. The formwork panel may be substantially planar to be in a plane substantially perpendicular to a travel surface formed by upper surfaces of the concrete bodies. The formwork panel may be extruded and may have at least one internal void to facilitate sacrificial compression of the formwork panel on expansion of the concrete bodies.