Hinged Plastic Stormwater Chamber Segmentation
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Solution Overview
Problem
The manufacturing and handling of large molded plastic stormwater chambers are hindered by the need for expensive and less common injection molding machines, and shipping challenges due to height constraints, which limit the number of chambers that can be stacked on a truck.
Innovation Solution
The chambers are designed as mated half-chambers connected by a hinge joint at the top, allowing them to be molded separately and assembled into a single unit, enabling storage and shipping in a flattened state, and easily converted to the arch shape for use by fusion welding at the joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large chambers are molded as single units, then structural integrity is maintained, but manufacturing cost increases due to expensive large-capacity injection molding machines
Solution Approach 1:
The chamber is divided into multiple segments (first chamber portion and second chamber portion) that can be molded separately using smaller, more economical injection molding machines. These segments are then connected through end-to-end overlapping and fusion welding, achieving both cost reduction and structural integrity.
2Volume of moving object
If chamber height is increased to provide larger volumetric capacity, then storage and shipping efficiency decreases due to height constraints on trucks
Solution Approach 1:
The chamber design transitions from a single tall unit to multiple shorter segments connected in series along the length dimension. This allows the same volumetric capacity to be achieved through increased length rather than height, enabling efficient stacking and shipping within standard truck height constraints.
3Ease of operation
If chambers are made as single units, then handling is simplified, but shipping capacity decreases due to height limitations
Solution Approach 1:
The chamber is segmented into multiple connectable portions that can be shipped separately and efficiently stacked on trucks. At the installation site, these segments are assembled through overlapping and fusion welding, achieving both improved shipping capacity and eventual structural unity.
4Volume of moving object
If larger injection molding machines are used to mold large chambers, then chamber size increases, but manufacturing cost increases
Solution Approach 1:
Large chambers are fabricated by dividing them into smaller moldable segments that can be produced on economical, smaller-capacity injection molding machines. The segments are then joined through fusion welding to form the complete large-chamber structure, avoiding the need for expensive large-capacity molding equipment.
Solution Approach 2:
Multiple separately molded chamber portions are merged through end-to-end overlapping and fusion welding to create a complete large chamber. This combining process achieves the desired large chamber size while using only smaller, more cost-effective molding machines for fabrication.
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
This solution reduces manufacturing costs, enhances shipping efficiency by allowing more chambers to be stacked, and simplifies handling and installation while maintaining structural integrity.
Implementation Method 1
The top portions of the half chambers are connected to each other at a lengthwise joint at the top of the chamber
Implementation Method 2
The chambers are designed as mated half-chambers connected by a hinge joint at the top, allowing them to be molded separately and assembled into a single unit, enabling storage and shipping in a flattened state, and easily converted to the arch shape for use by fusion welding at the joint
Data Source
AI summary
A method of making a molded plastic arch shape cross section stormwater chamber having a corrugated wall comprises molding half chambers which are connected by hinges at a joint at the top of the chamber. The chambers may be compactly stored and transported in splayed out configuration. Later, upward force is applied to the hinge joint location of each chamber, so the half chambers are rotated by force of gravity, whereby a faying surface on each half chamber is urged toward the like surface of the other half chamber. The faying surfaces are then fused to each other, preferably as a result of prior heating or by melting of a fusion weld element that is captured in the space between the faying surfaces.