Variable Radial Dislocating Element for Pile Excavation Bit
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Solution Overview
Problem
Existing pile excavation and compaction equipment faces high stresses on the drill rod and requires significant driving power, which is underutilized during bit extraction and concrete filling, leading to inefficient operations and the need for large equipment.
Innovation Solution
A bit with a central body, a first excavation screw, and a dislocating element featuring retention means that can be selectively reclosed to prevent debris fall and a radial development for compaction, along with an outlet mouth for concrete filling, allowing for efficient compaction and reduced stress on the drill rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional dislocating element with fixed radial development is used, then compaction of excavation walls is achieved, but high stresses are imposed on the drill rod and significant driving power is required
Solution Approach 1:
The dislocating element's radial development is made variable rather than fixed. During extraction, the radial development decreases progressively, allowing the element to adapt its compaction force to the varying conditions of soil resistance and drill rod capacity throughout the extraction process
Solution Approach 2:
The radial development parameter of the dislocating element is changed dynamically during extraction. The element transitions from a larger radial development at the start of extraction to a smaller radial development as extraction progresses, optimizing compaction while reducing stress on the drill rod
2Reliability
If equipment is designed for high driving power to handle compaction stresses, then adequate compaction is achieved, but the power is underutilized during extraction and concrete filling operations
Solution Approach 1:
The dislocating element operates in periodic cycles, being active during extraction to provide compaction when needed, and inactive or reduced during concrete filling. This periodic activation ensures power is used effectively only when compaction is required
Solution Approach 2:
The system dynamically adjusts the activity level of the dislocating element based on operational phase, providing high compaction force during extraction when soil resistance is encountered, and reducing or stopping operation during concrete filling to avoid power underutilization
3Device complexity
If retention means are not provided, then the bit structure is simpler, but debris falls beyond the leading edge during extraction
Solution Approach 1:
Retention means are introduced as an intermediary component between the dislocating element and the environment during extraction. This intermediary structure prevents debris from falling beyond the leading edge while maintaining relative simplicity in the overall bit design
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 enables reduced stress on the drill rod, efficient use of power during extraction, and compacting earth in two steps, allowing for smaller equipment and reduced costs, while eliminating the need for manual chain connection and metal disk handling.
Implementation Method 1
the dislocating element is mounted on a fixed portion of the retention means, and has a radial development decreasing with respect to a rotation of excavation of the first excavation screw for compaction of the walls of the excavation during extraction of the bit
Implementation Method 2
a first excavation screw fixed to the central body
Data Source
AI summary
Described herein is a bit (9) for excavation and compaction equipment (1) for erecting piles, the bit (9) being provided with a central body (21), an excavation screw (24) fixed to the central body (21), and a dislocating element (40) for compaction of the walls of the excavation, a retention device (25) that can be selectively re-closed being associated to the central body (21) for preventing fall of debris beyond a leading edge (27) of the screw (24) during extraction of the bit (9), and the dislocating element (40) being mounted on a fixed portion (28) of the retention device (25), and presenting a radial development, which decreases with respect to a rotation of excavation of the excavation screw (24) for compaction of the walls (3a) of the excavation (3) during extraction of the bit (9).