Composite Pipe Production via Concrete Shrinkage Bonding
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Solution Overview
Problem
Current methods for producing composite pipes with corrosion-resistant linings are costly, require specialized equipment and skills, and can lead to leaks due to complex adhesive processes, posing environmental risks.
Innovation Solution
A method where a concrete pipe is produced with formwork, and a corrosion-resistant inner pipe is inserted before the concrete hardens, forming a non-positive connection as the concrete shrinks around it, eliminating the need for adhesives and reducing production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner lining is attached using adhesives or binding agents, then the corrosion resistance is improved, but the processing complexity increases and requires trained specialists
Solution Approach 1:
The patent replaces the chemical bonding system (adhesives and binding agents) with a mechanical bonding system. The inner lining is attached through mechanical interlocking mechanisms such as anchor elements, ribs, or geometric interlocking features that physically secure the lining to the pipe structure without requiring chemical adhesives. This substitution eliminates the need for trained specialists in adhesive processing while maintaining reliable corrosion protection.
Solution Approach 2:
The inner lining is designed to attach itself to the pipe structure through self-aligning mechanical features. The lining incorporates integrated attachment elements that automatically engage with corresponding features on the pipe during installation, eliminating the need for external adhesive application and specialized processing skills. The system is self-sufficient and does not require additional materials or expert intervention.
2Manufacturing precision
If specialized equipment is used for producing inner coatings, then the manufacturing precision is improved, but the manufacturing cost increases
Solution Approach 1:
The patent employs simple, inexpensive formwork and attachment fixtures that are used temporarily during the lining installation process and then discarded or reused multiple times. Instead of investing in expensive specialized equipment, the system uses basic mechanical fixtures, templates, or even disposable positioning elements that ensure adequate lining placement precision without requiring costly machinery. The low cost of these simple tools offsets the need for high-precision specialized equipment.
Solution Approach 2:
The lining installation process is divided into discrete, simple steps that can be performed with basic equipment. The pipe is segmented into sections, and the lining is installed section by section using simple positioning fixtures rather than requiring a single complex specialized machine. This segmentation allows the use of multiple low-cost, simple tools instead of one expensive piece of equipment, reducing overall manufacturing costs while maintaining adequate precision.
3Reliability
If the inliner is manufactured first and then the concrete pipe, then the corrosion protection is improved, but the production time increases
Solution Approach 1:
The inner lining is pre-manufactured with integrated attachment features and pre-positioned relative to the pipe structure before final assembly. The lining incorporates predetermined geometric features that align with corresponding features on the pipe, allowing for rapid attachment without time-consuming on-site adjustments or complex bonding processes. This preliminary preparation of attachment mechanisms significantly reduces assembly time while ensuring reliable corrosion protection.
Solution Approach 2:
The patent combines the lining manufacturing and pipe manufacturing processes into a single integrated production flow. The inner lining and pipe structure are manufactured and assembled in one continuous process sequence, eliminating the need for separate manufacturing cycles and reducing total production time. The lining is attached to the pipe in the same production facility using mechanical interlocking, merging what would otherwise be distinct production stages into a unified process.
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 method significantly simplifies and accelerates the production of composite pipes, reduces costs, and ensures a permanent, reliable connection without specialized equipment or technical knowledge, enhancing durability and safety.
Implementation Method 1
forming a non-positive connection as the concrete shrinks around it
Data Source
Figure 1~4
Figure 5~6
AI summary
The method involves manufacturing a non-hardened pipe (1) with an outer sheathing and an inner sheathing in a sheathing design, where the pipe is made of concrete or concrete mixture. Another pipe (5) is attached to the pipe (1) and made of a corrosion-resistant material that is selected from a group such as plastic, vitrified clay, glass fiber reinforced plastic or glass, where the pipe (5) is attached to the pipe (1) by partially removing one of sheathings from the pipe (1), so that the pipe (1) has a partial sheathing-freed part at which the pipe (5) is attached. : An independent claim is also included for a composite pipe such as composite-liner-pipe having a concrete pipe and a liner pipe. USE : Method for manufacturing a composite pipe i.e. composite-liner-pipe (claimed), which is used in a sewage system. ADVANTAGE : The method partially removes one of sheathings from one of the pipes such that the pipe has the partial mold-freed part at which another pipe is attached, thus quickening and simplifying the manufacturing of the corrosion-protective composite pipes without requiring working steps such as attaching of half units for connecting of the pipes, and hence precisely reducing operating cost without special equipment structure and special technical knowledge. DESCRIPTION OF DRAWINGS : The drawing shows a longitudinal sectional view of a perpendicularly standing, fresh form removal concrete pipe that carries an outer sheathing. 1, 5 : Pipes 4 : Steel lower bushing 10 : Composite pipe INDUSTRIAL STANDARDS : The composite pipe is formed as a base module that is designed as standard- reinforced concrete pipe according to DIN EN 1916and DIN V 1201.