Helical Drill Bit with Eccentric End Section for Consistent Pile Diameter
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Solution Overview
Problem
Existing drilling equipment for excavated piles faces challenges in maintaining a consistent diameter throughout the drilling process, leading to issues with load-bearing capacity and production costs when creating barriers or partitions of intersecting piles, due to differences in piped and unpiped depth diameters.
Innovation Solution
A helical drill bit with a helical end section and support portion that maintains a consistent diameter by using an eccentric helical structure, allowing the bit to excavate a diameter similar to the casing pipe's cutting crown, and an intermediate section for smooth passage through the casing pipe, ensuring uniform excavation across both piped and unpiped depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional helical drill bit is used for auger drilling, then the drilling process can be completed, but the excavation diameter varies between piped and unpiped depth sections, compromising manufacturing precision
Solution Approach 1:
The drill bit is divided into three distinct sections: a support portion with first helical blades, an intermediate section with second helical blades, and a lower helical end section with third helical blades. Each section has specific geometric characteristics that enable it to perform different functions during drilling, with the intermediate section having a smaller diameter to facilitate smooth passage through the casing pipe while the lower end section has a larger diameter to maintain excavation diameter consistency
Solution Approach 2:
The drill bit employs an asymmetric diameter design where the intermediate section has a smaller diameter than the support portion and lower end section. This asymmetric geometry allows the intermediate section to pass through the casing pipe smoothly while the larger diameter sections maintain the required excavation diameter, resolving the contradiction between passage capability and excavation consistency
2Ease of operation
If the drill bit intermediate section has a smaller diameter for smooth passage through the casing pipe, then ease of operation improves, but the excavation diameter consistency deteriorates
Solution Approach 1:
The drill bit is segmented into three sections with the intermediate section having a smaller diameter for smooth passage through the casing pipe, while the support portion and lower end section maintain larger diameters to ensure excavation diameter consistency. This segmentation allows each section to optimize its function without compromising the other
Solution Approach 2:
Different sections of the drill bit have different local geometric qualities: the intermediate section has a smaller diameter locally to facilitate passage through the casing pipe, while the support portion and lower end section maintain larger diameters locally to ensure consistent excavation diameter. This local quality variation resolves the contradiction between ease of operation and manufacturing precision
3Manufacturing precision
If the drill bit has an eccentric helical structure to maintain consistent excavation diameter, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The complex eccentric helical structure is broken down into three manageable sections with progressively varying diameters and helical blade configurations. This segmentation makes the complex structure more manufacturable while maintaining the eccentric geometry needed for consistent excavation diameter
Solution Approach 2:
The drill bit employs parameter changes in diameter across its three sections, with the intermediate section having a smaller diameter and the support portion and lower end section having larger diameters. This parameter variation enables the eccentric helical structure to maintain consistent excavation diameter while remaining manufacturable through progressive geometric transitions
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 solution enables a consistent excavation diameter throughout the entire drilling length, improving load-bearing capacity and reducing production costs by maintaining uniformity and efficiency in creating excavated piles, especially in barriers or partitions of intersecting piles.
Implementation Method 1
a lower helical end section (20i) of the helical structure defined by the auger (9'), with an extremity axis (Y-Y) that is offset with respect to a longitudinal axis (X-X) of the auger (9')
Implementation Method 2
an intermediate section (20s) located between a support portion (23) and the lower helical end section (20i)
Implementation Method 3
the helical structure defined by the auger (9'), which conveys the ground that it excavates towards the land surface
Data Source
Figure 1
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AI summary
The helical drill bit (20) defines a helical end section (20i) of a helical structure formed at its periphery by an auger (9') of an excavation assembly, and it is associated or associable with a support portion (23) of the auger (9'). Such a support portion (23) defines a proximal section of the helical structure, which has an extension substantially centred around a longitudinal axis (X-X). The helical drill bit (20) is adapted to rotate about the longitudinal axis (X-X) together with the support portion (23) so as to drill a hole in the ground. The helical end section (20i) extends around an extremity axis (Y-Y; ψ-ψ) that is not aligned relative to the longitudinal axis (X-X).