Concrete Pipe Liner Joint Seal Using Elastomer Angle Profiles
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Solution Overview
Problem
Existing plug-in connections between tubular concrete workpieces with plastic inner linings face challenges in creating a corrosion-resistant joint seal with minimal manufacturing effort, particularly due to restrictions imposed by required radii for deformation of inner lining edges into radially projecting sealing flanges, which limits workpiece cross-sections and increases production complexity.
Innovation Solution
The use of a circumferential elastomeric angle profile with a front profile groove that forms sealing flanges, allowing the inner lining's edge to engage radially outwardly, eliminating the need for deformation and enabling a simple production process without constriction of the flow cross-section, and providing a labyrinth seal with elastic pretension for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner lining is deformed by heat to form radially projecting sealing flanges, then a corrosion-resistant joint seal is achieved, but the manufacturing effort increases and restrictions on workpiece cross-sections with sufficiently large radii of curvature are imposed
Solution Approach 1:
An elastomeric angle profile is introduced as an intermediary component between the inner lining and the sealing flange. The angle profile has a front profile groove that receives the inner lining edge, and its axis-normal leg forms the sealing flange. This mediator eliminates the need to deform the inner lining itself, thereby removing restrictions on workpiece cross-sections and radii of curvature while still achieving the required sealing function.
Solution Approach 2:
The sealing function is segmented into two independent parts: the inner lining (which provides corrosion protection) and the elastomeric angle profile (which provides the sealing flange). By separating these functions, the inner lining no longer needs to be deformed, eliminating manufacturing complexity and cross-section restrictions, while the angle profile can be easily attached and provides the necessary sealing capability.
2Ease of manufacture
If the inner lining edge is inserted into the front profile groove of the angle profile, then the production process is simplified and sealing flanges are provided, but additional measures are needed to ensure the angle profile remains anchored
Solution Approach 1:
The angle profile integrates multiple functions into a single component: it provides the sealing flange, receives the inner lining edge in its front profile groove, and includes lugs that protrude into the concrete body to ensure anchoring. This merging of functions into one element simplifies the overall structure while ensuring reliable attachment without requiring additional separate anchoring measures.
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 simplifies the production of tubular concrete connections by eliminating the need for complex deformation, ensuring a corrosion-resistant joint seal without restricting workpiece cross-sections, and providing effective protection against aggressive media penetration, while allowing for easy handling and integration of the angle profile as a joint seal component.
Implementation Method 1
The engagement of the peripheral edge of the inner lining in the front profile groove of the axis-parallel leg of the angle profile forms a labyrinth seal with a corresponding engagement depth, which generally excludes penetration of aggressive media to the concrete body.
Implementation Method 2
the sealing effect can be intensified if the groove walls of the end-side profile groove rest in the edge area under elastic pretension on the peripheral edge of the inner lining
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a plug connection between two tubular workpieces (1, 2) which are made of concrete and each of which has an inner liner (5) made of plastic, one workpiece forming a tip end (3) and the other forming a socket end (4) which receives the tip end (3). The inner liners (5) have circumferential sealing flanges (12) which cover the end face (13) of the tip end (3) or the socket face (14) and between which a joint seal (16) is provided. In order to provide advantageous structural conditions, the inner liners (5) are provided with a circumferential elastomer angled profiled section (8, 9) at the end face, wherein the angled profiled section receives the circumferential edge of the inner liner (5) in an end-face profiled groove (11) of the limb (10) of the angled profiled section parallel to the axis, and the limb of the angled profiled section at a right angle to the axis forms the sealing flange (12).