Angular Manhole Housing With Curved Trough
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Solution Overview
Problem
Conventional manholes with circular configurations face challenges in accommodating larger diameter pipes due to structural requirements, leading to increased size, cost, and difficulties in pre-fabrication and transportation, as they need to be larger than necessary to accommodate pipe connections and curvature for smooth water flow.
Innovation Solution
The manhole design features flat, angularly oriented sidewalls for pipe connections and a curved trough within a compact housing, allowing for a smaller footprint and reduced material usage while maintaining fluid flow capacity, using a configuration where the planar sidewalls and curved wall are oriented at the same angle as the pipe bend, enabling efficient sealing and reduced concrete requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circular manhole configuration is used, then smooth water flow and structural integrity are maintained, but the manhole size must be larger to accommodate pipe connections and curvature requirements
Solution Approach 1:
The patent applies asymmetry by replacing the conventional circular symmetric configuration with an asymmetric rectangular housing. The housing has flat sidewalls at incoming and outgoing locations with angular orientations matching the pipe bend angle, allowing compact dimensions while maintaining fluid flow capability. This asymmetric design reduces the footprint area compared to conventional circular manholes.
Solution Approach 2:
The patent uses curvature in the trough section to maintain smooth fluid flow. The trough has a curved configuration that matches the pipe bend angle, providing a smooth transition for water flow between inlet and outlet pipes. This curved design ensures reliable fluid flow while the overall rectangular housing maintains a compact footprint.
2Reliability
If larger manhole size is used to accommodate pipe connections, then pipe sealing and connection stability are improved, but material usage and transportation cost increase
Solution Approach 1:
The patent applies local quality by providing flat sidewalls with angular orientations specifically at the incoming and outgoing pipe connection locations. These localized flat surfaces provide stable sealing surfaces for pipe connections without requiring the entire manhole housing to be large. The curved trough section provides local quality for smooth fluid flow. This localized approach reduces overall material usage while maintaining connection stability where needed.
3Strength
If conventional circular manhole design is used, then structural strength is maintained, but pre-fabrication and transportation become more difficult for larger sizes
Solution Approach 1:
The patent uses asymmetric rectangular geometry that is more favorable for pre-fabrication than conventional circular shapes. The flat sidewalls and angular orientations allow for standardized manufacturing processes and easier transportation. The rectangular shape can be more efficiently handled and transported compared to large circular manholes, improving ease of manufacture and transportation while maintaining structural strength through proper wall thickness design.
Data Source
AI summary
A manhole for connecting fluid flow between and for providing access to an inlet pipe and an outlet pipe angularly oriented to one another in a sewage, storm water or like fluid handling system. The manhole comprises an upright housing which defines a manhole interior, the housing having first and second essentially planar upstanding outer sidewalls angularly oriented to one another at substantially the same angle as between the inlet and outlet pipes and a curved upstanding outer side wall extending between the first and second planar sidewalls. First and second openings are formed respectively through the first and second planar sidewalls into the manhole interior for receiving respective ends of the inlet and outlet pipes. A base section within the manhole interior defines a curvilinear fluid flow trough between the first and second openings for conveying fluid flow from the inlet pipe to the outlet pipe.