Cement-Mortar Pipe Joint Coating for End Corrosion Protection
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Solution Overview
Problem
Cast iron pipes with cement mortar coatings are uneconomical to manufacture due to the risk of mortar damage during removal of cement cutters and require retouching, and they lack effective corrosion protection, especially at the ends.
Innovation Solution
A pipe design featuring annular barriers made of synthetic or thermoplastic materials to control cement mortar flow and prevent axial movement, combined with an anti-corrosion base layer and protective coatings to prevent corrosion and damage, allowing for a controlled cement mortar coating and improved manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber cement cutters are used to prevent axial flow of mortar, then the mortar can be contained during pouring, but the mortar may be torn off during removal of the cutters
Solution Approach 1:
The invention changes the material parameter of the cement cutter from rubber to a material with lower adhesion to cement mortar (such as PTFE, polypropylene, or other low-friction materials). This parameter change maintains the ability to contain mortar during pouring while significantly reducing the adhesion force that causes mortar tearing during removal.
Solution Approach 2:
The invention employs disposable cement cutters made from inexpensive low-adhesion materials that are discarded after a single use. These cutters effectively contain the mortar during the pouring process and are then removed without causing damage, with no need for reuse or maintenance.
2Reliability
If cement mortar coating is applied to protect against corrosion, then corrosion protection is improved, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The invention applies preliminary protective measures by using low-adhesion cement cutters during the mortar application process. This preliminary action prevents mortar damage at the critical interface between the cutter and mortar, eliminating the need for subsequent retouching or repair operations.
Solution Approach 2:
The invention extracts the problematic adhesion property from the cement cutter material, separating the containment function from the adhesion property. By removing adhesion as a required property and replacing it with low-friction material properties, the process simplifies while maintaining effective mortar containment and surface integrity.
3Reliability
If annular stops are used as cement cutters, then axial flow of mortar is prevented, but the stops require manual installation and removal which reduces productivity
Solution Approach 1:
The invention designs the cement cutter system to be self-installing and self-removing. The low-adhesion material allows the cutter to be easily placed into position and then automatically released during removal without requiring manual intervention, tools, or complex operations, thereby significantly improving manufacturing efficiency.
Solution Approach 2:
The invention employs disposable cement cutters that are designed for single-use installation and removal without manual intervention. These cutters are inexpensive, easily installed, and automatically removed without damaging the mortar, enabling high-speed production with minimal labor involvement.
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 solution enables a more economical and efficient manufacturing process with controlled cement mortar thickness, reduced risk of mortar damage, and enhanced corrosion protection, ensuring the pipe's durability and performance.
Implementation Method 1
the anti-corrosion base layer contains zinc (Zn) and preferably is formed from an alloy of zinc (Zn), aluminum (AI) and copper (Cu)
Implementation Method 2
a cement mortar coating (80) arranged on the inner shaft surface (24)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This pipe comprises a base body (16) forming a shaft (22), the shaft having an internal shaft surface (24), an external shaft surface (26), a first axial end (28) and a second axial end (30). The pipe comprises a cement mortar coating (80) disposed on the internal shaft surface, a first annular barrier (84) disposed at the first axial end of the shaft and adapted to oppose an axial flow of the cement mortar in the non-solid state, and a joint end (12), the joint end being defined by a joint part (40) of the base body that comprises an internal joint surface (42). The pipe comprises a joint coating (60) extending over the internal joint surface. The joint coating (60) is connected to the first barrier.