Heated Sewer Liner Shuttering for Fast Branch Pipe Curing
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Solution Overview
Problem
Existing sewer rehabilitation methods face challenges with long supply pipes causing pressure issues and extended curing times due to the need for long pot life of rehabilitation compounds, leading to inefficient and costly rehabilitation processes.
Innovation Solution
An apparatus with a mobile carrier element, expandable expansion body, and integrated heating device allows for rapid curing of rehabilitation compounds by preheating them during transport and application, reducing the need for long pot life and minimizing the time the shuttering remains in the pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the rehabilitation compound is transported through long pipes from the exterior of the sewer, then the compound can be supplied to distant damaged areas, but the pressure loss during transport becomes excessive and the process becomes complicated
Solution Approach 1:
The rehabilitation compound is heated in advance during transport through the pipes before reaching the application point. This preliminary heating action reduces the compound's viscosity during transport, enabling it to flow through long pipes with acceptable pressure loss while maintaining its thixotropic properties for effective application
Solution Approach 2:
The temperature parameter of the rehabilitation compound is changed during transport by applying heat through heating elements in the transport pipes. This parameter change temporarily reduces viscosity to enable long-distance transport, then allows restoration of original properties at the application point
2Stress or pressure
If the rehabilitation compound is kept at low pressure during transport, then the compound can be moved through pipes, but the pressure is insufficient to completely fill defective sewer wall regions
Solution Approach 1:
The temperature of the rehabilitation compound is increased during transport to reduce its viscosity, allowing it to be pumped through pipes at lower pressures while still maintaining the ability to be pressurized effectively at the application point for complete filling of defective regions
3Reliability
If the shuttering remains in the pipe for extended curing time, then the rehabilitation compound can cure completely, but the working time is extended and costs increase
Solution Approach 1:
The rehabilitation compound is preheated during transport through the pipes before application. This preliminary thermal action reduces the subsequent curing time required after application, allowing the shuttering to be removed sooner while still ensuring complete and reliable curing of the compound
Solution Approach 2:
The temperature parameter of the rehabilitation compound is elevated during transport and application, which accelerates the chemical curing reaction. This parameter change reduces the time required for complete curing while ensuring reliable restoration of the sewer wall
4Duration of action of moving object
If the rehabilitation compound has long pot life, then the compound can be transported and applied, but the curing time is extended and productivity is reduced
Solution Approach 1:
The temperature of the rehabilitation compound is increased during transport through heating elements in the transport system. This parameter change reduces the compound's viscosity for easier pumping while simultaneously accelerating the curing reaction, allowing for shorter pot life formulations that cure faster and improve productivity
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 approach enables faster and more reliable pipe rehabilitation by ensuring rapid curing of the rehabilitation compound, reducing working costs and the time required for the rehabilitation process while maintaining effective sealing.
Implementation Method 1
a heating device which is integrated in the covering element and/or in the storage device and/or is operatively connected to the covering element and/or to storage device
Data Source
AI summary
A device for renovating damaged line walls proximate the connection of an auxiliary line to a main line, includes a movable support element, wherein a cover element and an expandable element are arranged on the support element. The expandable element can be positioned in the auxiliary line in or through a first recess in the cover element, and can lie against the wall of the auxiliary line to form a shell. The cover element has a second recess for introducing a curable viscous renovation compound from a storage device into space between the shell and the main and auxiliary line walls by a transport element. A heating device can be integrated into the cover element, the storage device, and/or the transport element proximate the second recess and/or operatively connected to the cover element, the storage device, and/or the transport element in the region of the second recess.