Sewage Frame with Inclined Outer Surface for Load Distribution
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Solution Overview
Problem
Existing road structure components, such as manhole and rainwater inlet frames, are subjected to excessive loads from vehicle traffic, which can lead to premature damage or destruction due to the concentration of forces on narrow openings and inadequate support structures.
Innovation Solution
The frame body is designed with a narrowing configuration from the upper end to the lower end, supported on an edge of an opening leading into the sewage system, and utilizes a backfill of at least two layers of filling compound, where the lower layer has a coarser consistency than the upper layer, to distribute forces effectively into the surrounding road body, reducing stress on the frame and enhancing load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame body is completely surrounded by the road surface and supported on embedded components, then the installation is stable and integrated into the road structure, but the entire weight and dynamic impact forces are concentrated on the narrow opening edge and embedded components, causing excessive stress and premature damage
Solution Approach 1:
The frame body is designed with an inclined outer surface that extends the support area from a narrow circular opening edge to a broader conical surface distributed across multiple dimensions of the road body. This dimensional expansion allows forces to be transferred to a larger volume of road material rather than being concentrated at the opening edge.
Solution Approach 2:
The frame body is divided into functional zones: the upper portion with the inclined outer surface for force distribution, the intermediate narrowing section for structural transition, and the lower portion for opening access. This segmentation allows each section to perform its specific function optimally while collectively resolving the stress concentration problem.
2Ease of manufacture
If the frame body has perpendicular walls extending from the road surface, then the structure is simple and easy to manufacture, but it cannot effectively distribute forces into the surrounding road body, leading to excessive stress on the frame and underlying structures
Solution Approach 1:
The transition from perpendicular walls to an inclined conical surface adds a dimensional component to the force distribution mechanism. The inclined surface creates a broader contact area with the road body, enabling forces to be dispersed over a larger volume rather than being transmitted vertically through narrow perpendicular walls.
Solution Approach 2:
The geometric parameters of the frame body are changed from a cylindrical shape with perpendicular walls to a conical shape with inclined surfaces. This parameter change fundamentally alters the mechanical behavior of the structure, transforming it from a force-concentrating geometry to a force-distributing geometry while remaining manufacturable.
3Force
If the frame body is designed with a narrowing configuration from upper end to lower end, then forces can be distributed over a larger area of the road surface, but the frame requires support from backfill material to effectively transfer forces into the road body
Solution Approach 1:
Different regions of the frame body are designed with different geometries to perform different functions: the upper portion has an inclined surface for force distribution, the intermediate section narrows for structural transition, and the lower portion provides opening access. This local differentiation optimizes each region's performance while managing the overall complexity.
Solution Approach 2:
The backfill material acts as an intermediary between the frame body and the road body, facilitating force transfer. The inclined outer surface of the frame body creates an interface that engages the backfill material, which in turn transfers forces to the surrounding road body, mediating the interaction between the frame and road structure.
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 design significantly reduces the stress on the frame and underlying structures by distributing loads over a larger area of the road surface, preventing damage and ensuring the frame can withstand dynamic loads from traffic without compromising the road structure's integrity.
Implementation Method 1
the frame is also supported on a backfill for the direct transfer of forces from the wall, which consists of at least two superimposed layers of backfill material, the lower of which is of a coarser consistency than the upper, so that a direct transfer of forces from the wall into the backfill takes place
Data Source
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AI summary
The frame e.g. shaft frame (2), has a body extending in a direction of an opening provided in a sewage system. The body surrounds an inner space (20) with a wall (15) to open an entrance for the opening. The wall has a structure on an outer side (14) that is turned away from the inner space, where the structure is narrowed from a road surface (10) in a direction of an edge surrounding the opening. The structure is surrounded in an upper region of a part of the road surface and has a bent in the direction of the opening, where the upper region is provided adjacent to an upper end.