Concrete Bench Support Mold With Stiffening Lips Against Bowing
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Solution Overview
Problem
Previous molds for casting concrete bench support structures often distort during the cooling process and lose shape during concrete forming, requiring physical manipulation and additional support methods to maintain shape, which is costly and labor-intensive.
Innovation Solution
The use of linear low density polyethylene molds with a flat base, continuous sides, and an outward-facing lip or tapered ribs to provide rigidity and stability, allowing for easier handling and separation of the mold from the concrete structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional wood, metal, or plastic molds are used for casting concrete bench support structures, then the molds can be manufactured and used, but the molds distort and lose shape during the cooling and concrete forming processes, requiring physical manipulation and additional support methods
Solution Approach 1:
The mold is divided into a base and multiple continuous sides that are integrally formed, with each side independently maintaining structural integrity. This segmentation allows the mold to be manufactured as a single piece while maintaining shape stability during use.
Solution Approach 2:
The mold is made from linear low density polyethylene, a composite material that combines the benefits of plastic (lightweight, easy to manufacture) with enhanced rigidity and shape retention properties, eliminating the distortion issues of traditional plastic molds.
2Device complexity
If traditional molds without stiffening structures are used, then the molds are simpler to manufacture, but they require heating and cooling mechanisms, spacer blocks, and clamps to maintain shape during the concrete forming process
Solution Approach 1:
Stiffening structures are strategically placed at specific locations on the mold - lips at the top and bottom circumferences of the sides - to provide maximum structural support where needed while maintaining overall simplicity of the mold design.
Solution Approach 2:
The continuous sides of the mold are designed with smooth curved transitions between the base and the open face, eliminating sharp angles that would be stress concentration points. The lips and ribs provide subtle curvature variations that enhance structural rigidity without complicating the overall form.
3Weight of moving object
If traditional plastic molds are used, then the molds are lightweight and easy to manufacture, but the sides bow in or out after cooling, rendering the mold unusable and requiring physical manipulation to reshape
Solution Approach 1:
The mold is pre-formed with lips at the top and bottom of the sides and tapered ribs during manufacturing, creating built-in stiffening structures that prevent bowing before the mold is even used. This preliminary structural reinforcement eliminates the need for post-manufacturing reshaping.
Solution Approach 2:
The mold design incorporates specific geometric parameters - lip thickness of about 0.5 inches, rib taper ratios, and continuous side configurations - that optimize the balance between lightweight construction and shape stability, allowing the thin-walled plastic mold to resist bowing forces.
4Device complexity
If molds without lifting features are used, then the mold design is simpler, but separating the mold from the cast concrete support structure becomes difficult and labor-intensive
Solution Approach 1:
The lips at the top of the sides serve multiple functions: they provide structural stiffening to prevent bowing during concrete forming, and they simultaneously act as lifting platforms for easy removal of the mold from the cast support structure. This multi-functionality eliminates the need for separate lifting features.
Data Source
AI summary
A mold for a concrete bench support structure including a closed base, a continuous wall projecting up from the circumference of the base, and structure attached to the wall that stiffens the wall.