Noncircular Bolt for Nested Profiled Components
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Solution Overview
Problem
Standard profiles used in three-dimensional parking garage structures result in material waste due to excessive length and poor appearance, with traditional welding methods causing structural deformation and limited reinforcement, especially in nested composite structures with hollow cavities.
Innovation Solution
An unconventional bolt with a noncircular cross section and threaded ends, used in conjunction with nuts and stop sleeves, provides enhanced rigidity and strength by securely fastening nested profiled components without the need for welding, allowing for easy assembly and disassembly while supporting internal cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding technology is used to fix the twin-layers transverse edges, then the connection strength is improved, but the appearance is degraded due to welding scars and the welding head cannot probe into the middle part of the beams
Solution Approach 1:
The patent replaces the welding mechanical system with a mechanical fastening system using bolts and nuts. The bolt passes through alignment holes in the nested profiles and is secured with a nut, providing connection strength without creating welding scars or requiring access to the middle of beams. This substitution resolves the contradiction by achieving strong connections while maintaining aesthetic appearance.
Solution Approach 2:
The patent introduces an intermediary mechanical fastening system (bolt and nut assembly) between the nested profile components. This intermediary provides the necessary connection strength while avoiding direct welding contact with the visible surfaces, thus resolving the appearance degradation issue while maintaining structural integrity.
2Strength
If welding technology is used to reinforce the twin-layers structure, then the reinforcement is achieved, but the inner cavity cannot be supported leading to structural deformation
Solution Approach 1:
The patent replaces the welding reinforcement system with a mechanical support system using the bolt and nut assembly. The bolt passes through the nested profiles and extends into the inner cavity, providing both reinforcement at the connection point and support for the cavity structure, thereby preventing deformation while achieving the desired reinforcement.
Solution Approach 2:
The patent transitions from two-dimensional surface welding to a three-dimensional mechanical fastening system that extends into the inner cavity. The bolt penetrates through the walls and provides support from within the cavity space, adding a new dimensional approach to reinforcement that simultaneously addresses both strengthening and cavity support requirements.
3Loss of substance
If nested profiles are used to save raw materials, then material utilization is improved, but the twin-layers structure at the middle position lacks reinforcement due to difficulty of sleeve probing
Solution Approach 1:
The patent replaces the sleeve-based reinforcement system with a bolt-and-nut mechanical fastening system. The bolt can be easily inserted through alignment holes in the nested profiles at any position, including the middle section, and secured with a nut to provide effective reinforcement. This eliminates the limitation of sleeve probing difficulty while maintaining the material-saving benefits of nested profiles.
Data Source
AI summary
An unconventional bolt includes a main body having two heads, and two threaded rods respectively formed at the external surface of each head coaxially with the main body, wherein the cross section of each head has a noncircular shape, and the axial projection of the cross section of the middle of the main body is located in the noncircular axial projection of each head of the main body. The unconventional bolt has a simple structure and a convenient assembly, and can improve the strength and rigidity of the nested profiled components after the connection; and the fastening device using the unconventional bolt can not only support the component but also reinforce it, thus effectively preventing the nested profiled components from transforming.