Rod-Type Pile Foundation Anti-Frost Heaving Mechanism
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Solution Overview
Problem
Rod-type pile foundations in cold regions are susceptible to frost heaving due to seasonal frost expansion and thawing, leading to cumulative displacement and instability of engineering structures.
Innovation Solution
A rod-type pile foundation design incorporating a base, support block, movably disposed support plate, and anti-frost heaving component with telescopic rods and a scraping plate that expands the soil to prevent upward heaving, using a transmission component to convert vertical motion into rotational motion for effective soil expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional rod-type pile foundation is used in cold regions, then the structure can be constructed with simple design and small load capacity, but the pile foundation becomes highly susceptible to frost heaving damage leading to cumulative displacement and instability
Solution Approach 1:
The patent applies preliminary anti-action by constructing an anti-frost heaving component before the frost heaving damage occurs. The component includes a scraping plate that scrapes the inner wall of the hole and a telescopic rod that expands the soil, creating a preventive mechanism that counteracts the upward heaving force before it can cause cumulative displacement and instability.
Solution Approach 2:
The patent implements preliminary action by performing soil expansion and scraping operations during the construction phase. The telescopic rod expands the soil and the scraping plate scrapes the hole wall before the pile foundation is fully installed, creating a pre-prepared state that prevents frost heaving damage in subsequent freezing-thawing cycles.
2Adaptability or versatility
If the pile foundation allows natural frost heaving, then the structure can accommodate soil expansion, but the upward heaving force causes the pile body to move upward and lose original position
Solution Approach 1:
The patent applies anti-weight by creating a counterbalancing mechanism that opposes the upward heaving force. The anti-frost heaving component generates a downward stabilizing force through soil expansion and scraping actions, counteracting the upward frost heaving force and preventing the pile body from moving upward and losing its original position.
Solution Approach 2:
The patent implements local quality by applying different functions to different parts of the pile foundation. The scraping plate specifically addresses the inner wall of the hole, while the telescopic rod targets the soil expansion, creating localized solutions that collectively prevent overall position instability.
3Duration of action of moving object
If repeated freezing and thawing cycles occur, then the soil undergoes natural expansion and contraction, but the cumulative frost heaving amount increases leading to excessive displacement
Solution Approach 1:
The patent applies continuity of useful action by ensuring the anti-frost heaving component operates continuously through multiple freezing-thawing cycles. The telescopic rod and scraping plate maintain their function of soil expansion and hole wall scraping throughout the service life, preventing cumulative frost heaving displacement and extending the pile foundation's service life.
Solution Approach 2:
The patent implements self-service by designing a self-regulating mechanism where the telescopic rod automatically adjusts its expansion based on soil conditions, and the scraping plate continuously maintains the hole wall. This self-service capability allows the pile foundation to resist cumulative frost heaving displacement without external intervention throughout its service life.
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 heaving by forming a large base at the bottom of the hole, overcoming upward freezing and expansion forces, thereby prolonging the service life and ensuring stability of engineering structures.
Implementation Method 1
the one or more telescopic rods extending to drive the scraping plate to continue to contact with soil to continuously expand the soil
Implementation Method 2
the first connecting rod rotating to drive the scraping plate to rotate to scrape an inner wall of the bottom of the drilled hole
Implementation Method 3
The transmission component may convert a vertical linear motion of the support plate into a rotation of the first connecting rod
Data Source
AI summary
The present disclosure provides a rod-type pile foundation for preventing a pile body from being heaved and an operating method. The rod-type pile foundation comprises a base, a support block fixed inside the base, a support plate movably disposed at a top of the support block by a guide structure, and an anti-frost heaving component located at a lower portion of the support block. The anti-frost heaving component includes a first connecting rod rotationally connected with the support block and one or more telescopic rods. One end of each of the telescopic rods is fixed on the first connecting rod. A scraping plate is fixed at another end of each of the telescopic rods. The support plate is in transmission connection with the first connecting rod through a transmission component. The transmission component converts a vertical linear motion of the support plate into a rotation of the first connecting rod.