Webless Corrugated Dual Wall Foundation Drain
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Solution Overview
Problem
Conventional HDPE foundation drain pipes lack vertical beam stiffness, leading to sagging and uneven footings, while existing solutions like PVC pipes are brittle and sensitive to handling.
Innovation Solution
A dual wall foundation drain is created by extruding a smooth HDPE outer wall over a rectangular corrugated HDPE pipe, increasing beam stiffness and eliminating the need for internal webs, thereby enhancing impact resistance and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional HDPE pipe is used for foundation drain, then impact resistance is improved, but vertical beam stiffness deteriorates
Solution Approach 1:
The patent combines corrugated HDPE pipe with a smooth outer wall layer to create a composite structure. The corrugated inner wall provides impact resistance while the smooth outer wall adds vertical beam stiffness, resolving the contradiction between these two properties.
Solution Approach 2:
The patent adds a dimensional element by incorporating a smooth outer wall that bridges the corrugations. This outer layer creates a stiffer structural dimension that prevents vertical sagging while maintaining the impact-resistant corrugated structure underneath.
2Stress or pressure
If rectangular PVC pipe is used for foundation drain, then vertical beam stiffness is improved, but brittleness increases
Solution Approach 1:
The patent uses a composite of corrugated HDPE (flexible, impact-resistant) and smooth outer wall (stiff), combining the benefits of both materials while avoiding the brittleness of PVC and the insufficient stiffness of plain corrugated HDPE.
Solution Approach 2:
The smooth outer wall is applied specifically where vertical beam stiffness is needed, while the corrugated structure remains in place for impact resistance. This localized application of different structural qualities resolves the contradiction.
3Strength
If internal webbing is added to HDPE pipe, then lateral strength is improved, but vertical beam stiffness remains inadequate
Solution Approach 1:
Instead of adding internal webbing, the patent adds an external smooth wall dimension that bridges the corrugations. This external reinforcement provides vertical beam stiffness without compromising lateral strength, and avoids the complexity of internal web structures.
Solution Approach 2:
The patent eliminates the need for internal webbing by extracting the stiffness-providing function and placing it in the smooth outer wall instead. This external reinforcement approach simplifies the overall structure while achieving the desired vertical beam stiffness.
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 dual wall design significantly increases vertical beam stiffness, preventing sagging and accordion-like distortion, while maintaining impact resistance, thus simplifying installation and ensuring level footings.
Implementation Method 1
a dual wall smooth exterior foundation drain pipe constructed of a generally rectangular shaped corrugated inner wall formed of a flexible plastic material and defined by spaced apart successive circumferentially extending inward protruding corrugations with an integrally formed outer smooth wall
Data Source
AI summary
A webless corrugated dual wall foundation drain which is constructed as a hollow rectangular tubular member with an inner corrugated wall formed of HDPE and an integral outer smooth wall formed of the same material. The outer smooth wall of the foundation drain is attached to and integrally formed with the corrugations of the inner corrugated wall through a coextrusion process, thereby significantly enhancing the vertical beam stiffness of the foundation drain and eliminating the need for an internal supporting web.