Laminated Wooden Pole Tendon Stability
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Solution Overview
Problem
Wooden poles used for streetlights and similar installations face challenges in maintaining erectness due to expansion, contraction, cracking, and deterioration from moisture, leading to instability and reduced durability, and laminated wood solutions have issues with coupling and repairability under external forces like wind loads.
Innovation Solution
A multi-functional wooden pole design incorporating a tension tendon within a laminated pole structure, connected by a base and upper tension unit, which provides tensile force to maintain stability and resilience against wind loads and vibrations, even when objects are installed on top.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wooden pole is used to harmonize with the surrounding environment, then aesthetic appearance is improved, but erectness and durability deteriorate due to expansion, contraction, cracking, and moisture deterioration
Solution Approach 1:
The patent uses laminated wood composed of multiple thin wood layers bonded together with adhesive. This composite structure prevents warping and cracking while maintaining the natural aesthetic appearance of wood, thereby resolving the contradiction between aesthetic appearance and structural reliability.
Solution Approach 2:
The wooden pole is divided into multiple thin layers that are laminated together. This segmentation allows each layer to be relatively thin and flexible, reducing internal stresses that cause warping and cracking, while the combined structure provides enhanced durability and erectness.
2Manufacturing precision
If a laminated pole is used to reduce defects, then manufacturing quality is improved, but coupling portions widen or split and loosen due to wear from long-term external forces
Solution Approach 1:
The coupling portions are designed with reinforced structures that distribute mechanical stresses across multiple layers and attachment points. The laminated structure with adhesive bonding prevents splitting at coupling portions, and the design includes features like widened bearing surfaces and multiple fastening points to prevent loosening from vibration and wind loads.
3Strength
If a solid wooden pole is used to maintain rigidity, then structural strength is improved, but processing into standardized dimensions requires significant effort and causes large wood loss
Solution Approach 1:
Instead of processing large solid wood logs into standardized dimensions, the patent uses multiple thin wood layers of standardized thickness that are laminated together. This allows for more efficient processing of smaller, standardized wood pieces while achieving the required structural strength and rigidity through the combined laminated structure.
Solution Approach 2:
The laminated wood structure achieves superior strength and rigidity compared to solid wood of equivalent weight and dimensions. By bonding multiple layers with adhesive, the composite material distributes stresses more effectively, allowing for standardized production with less material waste while maintaining or enhancing structural properties.
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 effectively enhances the erectness and durability of wooden poles by providing strong tensile and fixing forces, allowing them to maintain stability under wind loads and reduce deformation, thus improving the pole's ability to support objects without requiring frequent replacement.
Implementation Method 1
a tension tendon (500) located inside the insert hole (210) of the laminated pole (200) and having longitudinal opposite sides connected to the base connection unit (100) and the upper tension unit (400), respectively, such that the tension tendon (500) is fixedly mounted thereto while receiving a tensile force
Data Source
AI summary
A multi-functional wooden pole according to an embodiment of the present disclosure has improved erectness due to a tendon is proposed. The multi-functional wooden pole is capable of maintaining a stable erection state while easily responding to a wind load even when an object having a predetermined weight is installed on an upper side of the wooden pole in a longitudinal direction thereof.