Foundation Packing Structure for Ventilation and Quake Resistance
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Solution Overview
Problem
Existing foundation packings made of synthetic resin, while improving ventilation, are susceptible to deterioration in compressive strength and resistance to horizontal quakes, especially during large earthquakes.
Innovation Solution
A foundation packing design comprising paired long packing main bodies with connectors and reinforcing shelf boards that divide ventilation passages, enhancing resistance to horizontal quakes without compromising compressive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the foundation packing is thickened to enlarge the ventilation area, then the ventilation capability is improved, but the compressive strength deteriorates
Solution Approach 1:
The foundation packing is divided into multiple vertical plates arranged side by side, creating segmented ventilation passages between them. This segmentation allows the structure to maintain sufficient thickness for ventilation while distributing mechanical loads across multiple load-bearing elements, thereby preserving compressive strength despite increased overall thickness.
Solution Approach 2:
Instead of simply increasing thickness in one dimension, the invention utilizes the width dimension by arranging multiple vertical plates side by side. This dimensional transition creates multiple ventilation passages without requiring excessive thickness, thus maintaining compressive strength while achieving enhanced ventilation capability through increased total ventilation area.
2Reliability
If the ventilation hole is vertically elongated to improve ventilation, then the ventilation area increases, but the resistance to horizontal quake deteriorates
Solution Approach 1:
Multiple vertical plates create segmented ventilation passages that are shorter in individual height compared to a single long ventilation hole. This segmentation maintains quake resistance by keeping individual plate structures compact while achieving total ventilation area through the number of passages rather than the length of individual passages.
Solution Approach 2:
Multiple vertical plates are combined side by side to create a composite structure where the collective arrangement provides both adequate ventilation area and enhanced resistance to horizontal quakes. The merging of multiple shorter passages achieves the ventilation function without the structural weakness of individual long vertical holes.
3Quantity of substance
If the dividing walls are made thinner to reduce material, then the manufacturing cost decreases, but the structural integrity under horizontal load deteriorates
Solution Approach 1:
The structure uses multiple thin vertical plates instead of fewer thick walls. While each individual plate is thin, the collective arrangement of multiple plates distributed across the width provides sufficient structural integrity under horizontal loads while minimizing total material usage through efficient spatial distribution.
Solution Approach 2:
Each vertical plate is designed with locally optimized thickness sufficient for its specific position and load conditions. The local quality of each plate is tailored to provide adequate strength where needed while maintaining thin profiles, and the collective arrangement of these locally optimized plates achieves both material efficiency and structural integrity.
Data Source
AI summary
A foundation packing 1 includes a pair of long packing main bodies 2 and connectors 3. The paired long packing main bodies 2 include a first packing main body 11 and a second packing main body 12. The connectors 3 bridge the paired packing main bodies 2. The connectors 3 are provided at intervals in the longitudinal direction of the paired packing main bodies 2. The first packing main body 11 includes a long top plate 21, a long bottom plate 22, vertical plates 23, and reinforcing shelf boards 24. The top plate 21, the bottom plate 22, and the vertical plates 23 form ventilation passages 30 penetrating the packing main bodies in the width direction of the foundation packing 1. The reinforcing shelf board 24 divides each ventilation passage 30 into two in the up-down direction.