Hybrid Compensating Ring Formwork for Sewage Shaft Corrosion
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Solution Overview
Problem
Conventional load-transmitting compensation rings used in sewage shafts and road gullies, particularly those made of concrete, are prone to breakage, corrosion from gases, and de-icing salt attacks, leading to costly repairs and safety hazards, while polymer-based rings lack adhesion to concrete components.
Innovation Solution
A hybrid compensation ring produced using a formwork ring with a rotationally symmetrical, integral design that allows for on-site casting with reinforced concrete, featuring binding elements for mechanical connection and a polymer material for the formwork ring to prevent corrosion, enabling a durable and cost-effective solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If concrete compensation rings are used, then load-bearing capacity is provided, but they are susceptible to breakage and corrosion from gases and de-icing salts
Solution Approach 1:
The patent applies composite materials by combining polymer material (for corrosion resistance) with concrete (for load-bearing capacity) to create a hybrid compensation ring that overcomes the limitations of using either material alone. The polymer-concrete composite structure provides both strength and durability against corrosive environments.
2Reliability
If polymer material compensation rings are used, then resistance to corrosion is improved, but no adhesion to concrete components can be produced
Solution Approach 1:
The hybrid design combines polymer and concrete materials in a composite structure where the polymer provides corrosion resistance and the concrete provides adhesion to concrete components. This composite approach allows both materials to contribute their advantageous properties to the final product.
3Productivity
If concrete compensation rings are transported from production site, then production capacity is maintained, but transport and storage costs increase and damage risk arises
Solution Approach 1:
The patent segments the compensation ring into a reusable formwork component and a cast concrete component. The formwork can be transported and reused multiple times, while the concrete is cast locally, eliminating the need to transport heavy finished concrete rings and reducing transport time and damage risk.
4Ease of manufacture
If conventional concrete compensation rings are used, then manufacturing simplicity is maintained, but installation errors may occur due to lack of orientation guidance
Solution Approach 1:
The patent introduces asymmetric features (such as keyways, positioning elements, or orientation marks) on the rotationally symmetrical formwork to provide installation guidance. These asymmetric elements ensure correct orientation during installation while maintaining the overall simplicity of the manufacturing process.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a formwork ring (1) for the production of a hybrid compensating ring (10), with a wall (2) which is divided into wall sections (2.1, 2.2, 2.3, 2.4, 2.5), and which is formed in one piece and is ring-shaped and rotationally symmetrical about an axis A and has a passage (3), wherein at least one wall section (2.2, 2.4) of the wall (2) defines a plane E on which the axis A is perpendicular, and wherein at least one further wall section (2.3) is perpendicular to the plane E.