Helical Thread Displacement Tool for Soil
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Solution Overview
Problem
Existing displacement tools for concrete piles require high-weight machines to apply torque due to increasing friction with soil as the thread length increases, making them impractical for certain applications.
Innovation Solution
A displacement tool with a tubular member and a cylindrical displacement means featuring a helical thread only on the cylindrical portion, reducing friction and allowing for a low-weight machine to be used, while the cylindrical portion's larger diameter and conical extensions enhance load-bearing capacity and soil stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thread length is increased to improve load bearing capacity, then the friction between the displacement tool and soil increases, but this requires a high-weight machine to apply the needed torque
Solution Approach 1:
The displacement tool is segmented into distinct functional zones: a cylindrical portion with helical thread for soil displacement, conical portions for cutting and compaction, and a tubular member for concrete delivery. This segmentation allows each zone to perform its specific function efficiently without requiring excessive torque across the entire length
Solution Approach 2:
Different portions of the displacement tool have different geometries optimized for specific functions: the cylindrical portion with helical thread provides localized displacement action, while the conical portions provide cutting and compaction actions. This local optimization reduces the overall torque requirement compared to a uniform threaded design
2Reliability
If a threaded displacement tool is used to improve pile bearing condition, then soil is displaced sideways effectively, but the friction increases with thread length requiring heavy machinery
Solution Approach 1:
The tool combines multiple displacement mechanisms (helical thread on cylindrical portion, conical cutting edges, and tubular confinement) to achieve reliable pile bearing conditions through distributed soil displacement rather than relying on a single long thread
Solution Approach 2:
The invention changes the geometric parameters along the tool length: the cylindrical portion has a specific diameter and thread pitch optimized for displacement, while the conical portions have varying angles optimized for cutting and compaction. These parameter variations enable effective soil displacement with reduced torque requirements
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 reduces friction and allows for efficient soil displacement with a low-weight machine, achieving high load-bearing capacity and efficient pile formation without the need for heavy machinery.
Implementation Method 1
the friction between the displacement tool and the soil increases with increasing length of the thread
Data Source
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AI summary
The invention relates to a displacement tool for displacing soil, wherein the displacement tool comprises a tubular member and a displacement means connected to the tubular member in a rotationally fixed manner, wherein the displacement means comprises a cylindrical portion enclosing the tubular member wherein the displacement means (2) comprises a, in particular helical, thread (5) that is only arranged on the cylindrical portion (4) wherein the thread (5) comprise at least one, in particular merely one, winding wherein a. at least one tooth (8) is arranged at an end (10) of the thread (5) and/or in that b. at least one further tooth (9) is arranged at another end (11) of the thread (5).