Cross-Laminated Wooden Panel With Steel Screw Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wooden panels for timber structures face issues with cutting losses and material waste due to the use of soft connecting materials like aluminum nails or screws, which compromise static strength and environmental sustainability, and traditional manufacturing methods result in inefficient material usage and high waste generation.
Innovation Solution
The development of a waste-less cut-less composed wooden panel using steel wood screws, where the panels are designed with pre-made openings and a static core structure, allowing for precise placement of screws to maximize buckling resistance and minimize material consumption, resulting in zero cutting losses and significant material savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminium nails or screws are used to connect wooden boards, then the panel can be processed by wood-working machines without damage, but the static strength and buckling resistance of the panel deteriorates
Solution Approach 1:
The patent divides the panel into multiple layers of wooden boards (at least three layers) connected by steel screws, where each layer can be independently positioned and connected. This segmentation allows the use of stronger steel screws for connection while maintaining the overall panel structure that can be processed by wood-working machines, resolving the contradiction between connection strength and processability.
Solution Approach 2:
The patent creates a composite structure combining wooden boards with steel fastening elements. The steel screws provide superior mechanical strength and buckling resistance compared to aluminum fasteners, while the wooden board layers maintain compatibility with wood-working machine processing. This composite approach allows both strong connections and machine processability.
2Strength
If traditional prefabrication methods with multiple layers of boards are used, then the static strength requirements are met, but cutting losses amount to 10-30% of the panel surface
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-positioning the wooden boards in their final configuration with all necessary openings, windows, and doors integrated into the panel design before assembly. This eliminates the need for subsequent cutting operations that would generate waste, while the multi-layer construction with steel screws ensures the required static strength is achieved.
3Reliability
If a large quantity of aluminium connecting material is used to compensate for low strength, then the panel connections meet minimum requirements, but the consumption of connecting material increases significantly
Solution Approach 1:
The patent applies parameter changes by switching from aluminum fastening material to steel fastening material, which has superior mechanical properties including higher tensile strength, shear strength, and buckling resistance. This material parameter change allows for reduced quantity of connecting material while achieving better connection reliability and structural performance.
Data Source
Figure 1A~2D
Figure 3A~3C
Figure 4A~4B
AI summary
A wooden panel (1) for a wooden timber buildings construction, composed from cross laminated wooden planks (5) forming layers (2), wherein the planks (5) of a second layer (2) are laid in respect of the planks (5) of a first layer (2) at an angle ranging from 45° to 135°, and side walls (7) of the planks (5) in orthogonal projection onto a contact wall (3) of closely fitted layers (2) create projection patterns (13) having a shape of quadrangles, wherein the wooden panel (1) has at least one opening and/or at least one depression and contains a static core (14) composed from three closely fitted layers (2) of planks (5), wherein the planks (5) of an external layer (2) of the static core (14) are arranged vertically in the panel (1), and wherein the layers (2) of planks (5) are screwed together by steel wood screws (10) placed in at least two pieces in each projection pattern (13).