Electrothermal Air-Blowing Tower Base for Permafrost Frost Heave
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Solution Overview
Problem
Transmission line tower supports in permafrost regions experience frost heave due to soil freezing and expansion, leading to loss of fixation capability and structural instability.
Innovation Solution
A transmission line tower base with electrothermal air-blowing anti-frost heave functions, utilizing a pile foundation cylinder, heating rods, and a top air-blowing device to raise soil temperature and prevent freezing, incorporating a controller to manage heating and airflow based on temperature and energy data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission line tower base is fixed in permafrost soil, then the tower support is stable under normal conditions, but the soil freezing and expansion causes frost heave that lifts the foundation and loses fixation capability
Solution Approach 1:
The heating rods are installed in advance within the pile foundation cylinder, and the air-blowing device is positioned to direct warm air onto the soil surface before freezing occurs. This preliminary anti-action prevents frost heave by maintaining soil temperature above freezing point during cold seasons, counteracting the harmful freezing and expansion forces before they can lift the foundation.
Solution Approach 2:
The system changes the temperature parameter of the soil by using heating rods that generate heat and an air-blowing device that delivers warm air to the soil surface. This parameter change (maintaining temperature above 0°C) prevents the phase change of soil moisture from liquid to solid, thereby eliminating frost heave and preserving fixation capability.
2Object-affected harmful factors
If heating rods are installed to prevent soil freezing, then frost heave is prevented, but energy consumption increases
Solution Approach 1:
The heating system operates periodically rather than continuously. The controller activates heating rods and the air-blowing device during periods when soil temperature approaches freezing point (typically nighttime or during cold spells), and deactivates them when temperatures are safely above freezing. This periodic operation maintains frost heave prevention while significantly reducing overall energy consumption compared to continuous heating.
Solution Approach 2:
The controller receives temperature data from sensors monitoring the soil and air, and uses this feedback to intelligently control the heating rods and air-blowing device. When the soil temperature is above a predetermined threshold, heating is reduced or stopped; when temperature approaches the freezing point, heating is activated. This feedback mechanism optimizes energy consumption by applying heat only when necessary to prevent frost heave.
3Object-affected harmful factors
If a complex heating and airflow control system is implemented, then anti-frost heave effectiveness is improved, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it monitors temperature from sensors, processes the temperature data, makes control decisions, and actuates both the heating rods and the air-blowing device. By consolidating these multiple functions into a single control unit, the system achieves effective anti-frost heave protection while minimizing device complexity and avoiding the need for separate control systems for each component.
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 effectively prevents frost heave by maintaining soil temperature above freezing, ensuring stable tower support and minimizing ecological disruption.
Implementation Method 1
Two heating rods 8 may be symmetrically connected to an outer wall of the support column 5 through hinge connectors 81, the two heating rods 8 may be respectively inserted into two inclined channels 151 of the pile foundation cylinder 1
Implementation Method 2
The top air-blowing device 9 may be arranged at the top of the pile foundation cylinder 1 and includes an outer casing 91, a fan 92, and a fan drive motor 93
Implementation Method 3
The blowing airflow of the top air-blowing device 9 blows into the airflow channel, prompting the heat of the heating rods 8 in the airflow channel to be fully emitted to the surrounding soil
Data Source
AI summary
The embodiment of the present disclosure provides a transmission line tower base with electrothermal air-blowing anti-frost heave functions for permafrost regions. The transmission line tower base includes a pile foundation cylinder, a cylinder top seat, a cylinder base, a transmission line tower connection frame, a support column inside the pile foundation cylinder, arcuate tubes, heating rods, and a top air-blowing device. The cylinder top seat is fixedly provided at a top of the pile foundation cylinder, and the transmission line tower connection frame is fixedly mounted on the cylinder top seat for connecting to a bottom foot of a transmission line tower body. The cylinder base is provided at a bottom of the pile foundation cylinder. The pile foundation cylinder includes a hollow installation cavity, and the support column is embedded in the installation cavity.