Wooden Member Assembly with Embedded Screw Fixation
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Solution Overview
Problem
Existing wooden structural members reinforced with steel rods face challenges in load-bearing performance due to deformation of wooden materials under large forces and exposure of fixation structures, which hinder efficient joining and aesthetics.
Innovation Solution
A wooden member assembly using metal screw members with cylindrical shafts and spirally protruding blades, where the tensile member is threaded through these screw members, allowing the tensioning force to be distributed axially, reducing the size of the fixation structure and enabling easy joining while improving load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the contact area of the metal member is increased to prevent deformation of the wooden material, then the load-bearing performance is improved, but the fixation structure becomes large and complex
Solution Approach 1:
The fixation structure is segmented into multiple screw members distributed along the wooden member, each contributing to the overall load-bearing capacity. This segmentation allows the force to be distributed across multiple smaller contact points rather than requiring a single large contact area, thereby reducing the complexity of individual fixation elements while maintaining overall strength.
Solution Approach 2:
The fixation structure transitions from a two-dimensional surface contact approach to a three-dimensional distributed contact approach. By embedding screw members at multiple locations along the length of the wooden member, the fixation structure utilizes the longitudinal dimension to distribute forces, reducing the need for large cross-sectional contact areas and simplifying the overall structure.
2Strength
If the fixation structure for the tensile member is made large to prevent deformation, then the load-bearing performance is improved, but the wooden member cannot be easily joined to other members
Solution Approach 1:
The fixation structure is divided into multiple discrete screw members that can be independently positioned and secured. This segmentation allows for modular joining operations where the wooden member can be connected to other members between or around the screw members without requiring a large, monolithic fixation structure to be removed or adjusted.
Solution Approach 2:
The screw members are strategically positioned at specific locations along the wooden member where local reinforcement is needed, rather than requiring a large continuous fixation structure. This localized approach maintains the strength necessary for load-bearing while leaving other areas of the wooden member accessible for joining operations.
3Strength
If the fixation structure is made large to prevent deformation, then the load-bearing performance is improved, but the appearance is degraded due to exposure of fixation portions
Solution Approach 1:
The screw members are embedded within the wooden member, with only minimal portions exposed for fixation purposes. The fixation structure is nested within the contours of the wooden member, allowing the wood to remain the predominant visual element while the metal fixation portions are concealed within the wooden structure, thereby maintaining aesthetic appearance.
Solution Approach 2:
The fixation portions are minimized to only the necessary local areas where the screw members contact the wooden member. By concentrating the fixation function at these specific localized points rather than exposing large portions of the fixation structure, the appearance is preserved while the load-bearing performance is maintained through the distributed contact of the embedded screw members.
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
The solution enhances the load-bearing performance of wooden members by distributing the reactive force of the tensile member over a wider area, reducing the size of the fixation structure, and allowing for efficient embedding within the wooden material, thus improving the assembly's ability to resist bending moments and facilitating easy joining with other members.
Implementation Method 1
the reactive force from the tensile member into which a tensioning force has been introduced acts on the screw members and then transferred from the spirally protruding blades of the screw members to the wooden member
Implementation Method 2
metal screw members each including a cylindrical shaft portion having a through hole formed therein in an axial direction thereof and a blade spirally protruding from an outer peripheral surface of the shaft portion are axially threaded into a wooden member
Data Source
AI summary
Wooden member to be easily joined to another member, with good appearance of decreased size fixation structure for tensile member to improve the load bearing performance. Metal screw members including cylindrical shaft portions having an axial direction through hole and blade spirally protruding from the shaft portion are axially threaded into wooden member at two locations. Groove or hollow hole is between the two screw members, and steel rod extends from the through hole of one of the screw members through the groove or hollow hole into the through hole of the other. Both ends of the steel rod with tensioning force are locked to the screw member by nuts. Cutout recesses are formed in the wooden member, and the screw members are threaded into the wooden member through the recesses and the steel rod is locked to the screw members.