Floating Manhole Adjustment Using Infrared Heating and Segmented Rings
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Solution Overview
Problem
The existing methods for adjusting or replacing a floating manhole are costly and time-consuming due to the expansion and contraction of roadway surfaces, leading to deformation and damage, which requires extensive resurfacing and consumption of asphalt concrete mixture.
Innovation Solution
Infrared heating of the manhole and surrounding asphalt concrete mixture, followed by the insertion of a protective sleeve and pouring of new asphalt concrete mixture, which is then mixed and compacted with a vibratory roller to form a homogeneous surface, allowing for quicker and more efficient alignment with the roadway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the manhole is raised using a cylinder-shaped adjusting ring and new asphalt concrete mixture is poured around it, then the manhole position is adjusted, but a large amount of asphalt concrete mixture is consumed and waste is generated
Solution Approach 1:
The adjusting ring is divided into multiple segments that can be assembled together to form the complete adjusting structure. This segmentation allows for precise positioning and adjustment while reducing material waste, as only the necessary segments are installed rather than replacing entire sections of asphalt.
Solution Approach 2:
The adjusting ring segments are designed to be removable and reusable. After the manhole is properly positioned and the asphalt is laid, the adjusting rings can be removed and reused for future adjustments, eliminating the need to discard them as waste material.
2Manufacturing precision
If the manhole is raised to the desired position, then the alignment is improved, but a lot of time is required to cut out and replace the old asphalt concrete mixture
Solution Approach 1:
The adjusting rings are pre-installed on the manhole structure before the asphalt concrete mixture is poured. This preliminary positioning ensures that the manhole is correctly aligned with the roadway surface before the final asphalt layer is applied, eliminating the need for time-consuming cutting and replacement operations after the fact.
Solution Approach 2:
The adjusting rings serve as an intermediary element between the manhole and the roadway surface. They provide a stable, pre-positioned foundation that facilitates proper alignment without requiring extensive removal and replacement of the surrounding asphalt concrete mixture.
3Reliability
If the protective sleeve is inserted into the well cavity, then debris entry is prevented, but the device complexity increases
Solution Approach 1:
The protective sleeve is designed to perform multiple functions: it prevents debris from entering the well cavity during asphalt pouring, serves as a temporary formwork for the new asphalt concrete mixture, and can be easily removed after the asphalt sets. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The protective sleeve is constructed from flexible material that can be easily inserted into the well cavity and removed after use. This flexibility simplifies the installation and removal processes, offsetting the added complexity of introducing this protective component into the system.
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 reduces the time and financial costs associated with manhole adjustments or replacements by minimizing the destruction of existing asphalt and preventing debris from entering the well, while ensuring a stable and even surface alignment.
Implementation Method 1
the manhole itself and the cracked, dented, deformed asphalt concrete mixture around it are heated with infrared rays to the required temperature
Implementation Method 2
the manhole is newly placed and, together with the asphalt concrete mixture spread around it, compacted with the help of a vibratory roller or a vibratory plate
Data Source
AI summary
The present disclosure relates to the field of construction, and, more particularly, to the adjustment of the position of a floating manhole or the replacement of a manhole with a new manhole so that the manhole is aligned with the connecting surface, e.g., the roadway. The object of the disclosure is to make it quicker, easier, and cheaper to adjust the position of a floating manhole, or to replace the manhole with a new manhole by aligning the manhole surface with the connecting surface, e.g., the roadway.