Timber Cambering via Expansive Material Incisions
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Solution Overview
Problem
Current timber-concrete composite construction methods, such as those using Dowel laminated timber (DLT) elements, face challenges with high material and labor costs due to complex notch production and understaying requirements to prevent bending, which slows down construction and increases costs.
Innovation Solution
The introduction of an expansive material into incisions on the surface of timber elements allows for on-site cambering, eliminating the need for understaying and enhancing shear-resistant connections with micro-notches, thereby reducing material waste and construction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional understaying is used to prevent bending of timber elements during concrete pouring, then structural integrity is maintained, but construction time increases and productivity decreases
Solution Approach 1:
The camber is introduced into the timber element before the concrete is poured, so that the element is pre-prepared to counteract the bending forces that will occur during concrete placement. This preliminary cambering eliminates the need for temporary understaying supports during construction.
Solution Approach 2:
The timber element's geometric parameter (curvature/camber) is changed from a straight configuration to a pre-curved configuration. This parameter change allows the element to naturally resist bending forces during concrete pouring without requiring additional temporary supports.
2Loss of substance
If complex notches and undercuts are produced to achieve shear-resistant connection without screws, then material usage is reduced, but manufacturing complexity increases
Solution Approach 1:
Instead of producing complex three-dimensional undercuts throughout the notch area, the invention applies a simpler solution with localized cambering at specific points along the timber element. This local quality approach reduces manufacturing complexity while still achieving the shear-resistant connection function.
3Reliability
If cross-laminated timber panels are understayed to prevent bending, then structural integrity is maintained, but work effort and time consumption increase
Solution Approach 1:
The camber is introduced into the cross-laminated timber panels before concrete placement, pre-preparing them to resist bending forces. This eliminates the need for temporary understaying and subsequent deshuttering operations, significantly reducing construction time and work effort.
Solution Approach 2:
The geometric parameter of the timber panels is changed from flat to cambered, enabling them to naturally counteract bending forces during concrete pouring without requiring temporary supports that would later need to be removed.
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 enables quick and cost-effective cambering of timber elements on-site, improving load-bearing capacity and reducing construction time and material consumption, while maintaining structural integrity.
Implementation Method 1
inserting an expansive material into incisions in the surface of the timber element
Data Source
AI summary
The invention relates to a method for the cambering of a wooden element, comprising the steps of: cutting to form at least one incision in a surface of the wooden element; inserting an expansive material into the at least one incision of the wooden element; letting the expansive material expand in the at least one incision so that a cambering of the wooden element is achieved.