Drill Tip with Conic Spiral Flights Reduces Torque

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Solution Overview

Problem

Existing rotary displacement pile drilling technologies require high power and expensive equipment due to excessive torque and vibration, making the installation process inefficient and costly.

Innovation Solution

A drill tip with a cylindrical pile attachment structure and a soil penetrating body featuring a descending continuous conic spiral design with undercut outer faces and symmetrically distributed soil disturbing blades, reducing the torque required for penetration by minimizing skin friction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If traditional auger or helical pile drilling methods are used, then the pile can be installed into the ground, but excessive torque and vibration are generated requiring expensive specialty equipment with tremendous power

Engineering Contradiction:

Improvepower required for pile installationVSAvoidease of pile installation

Core Design Contradiction:

PowerVSEase of operation

Solution Approach 1:

The drill tip is segmented into distinct functional zones: a pilot tip for initial penetration, soil disturbing blades for breaking up soil, and helical flights for displacement and lifting. This segmentation allows each component to perform its specific function efficiently, reducing the overall torque required compared to traditional solid augers

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a traditional auger that rotates and digs soil upward, this invention uses a pilot tip that penetrates first, followed by soil disturbing blades that break soil, and helical flights that lift and displace soil laterally. This inverted sequence of operations reduces resistance and torque requirements

Inventive Principle:

Principle #13The other way round (Inversion)

2Strength

If driven piles are used to achieve stiffer response and higher load capacity, then the pile performance is improved, but excessive vibration and noise are generated

Engineering Contradiction:

Improveload carrying capacityVSAvoidvibration and noise

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The helical flights create a periodic lifting and displacing action as they rotate, progressively advancing the pile into the ground. This periodic mechanism allows controlled installation with reduced vibration compared to impact driving, while still achieving high load capacity through the helical displacement action

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The invention replaces the impact-based mechanical driving system with a rotary screw-based system. The helical flights convert rotational motion into linear advancement, eliminating the excessive vibration and noise associated with traditional pile driving while maintaining load capacity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If drilled displacement piles are used to improve end bearing and skin friction capacity, then the pile performance is enhanced, but expensive specialty equipment with tremendous torque requirements is needed

Engineering Contradiction:

Improveend bearing and skin friction capacityVSAvoidtorque and crowd forces

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The drill tip features local quality variations with a pilot tip for penetration, soil disturbing blades for soil breakdown, and helical flights for displacement. Each local region performs a specific function that collectively reduces torque requirements while maintaining reliable end bearing and skin friction capacity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the geometric parameters of the drill tip, using a pilot tip with smaller diameter than the pile shaft, and helical flights with specific pitch and depth ratios. These parameter changes optimize the balance between penetration efficiency and torque requirements, reducing energy consumption while maintaining pile reliability

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If traditional auger cast-in-place piles are used to reduce equipment cost, then the installation process is simpler, but the end bearing and skin friction capacities are lower compared to drilled displacement piles

Engineering Contradiction:

Improveequipment complexityVSAvoidend bearing and skin friction capacity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The drill tip combines multiple functions in a single component: penetration (pilot tip), soil disturbance (blades), and displacement (helical flights). This multi-functionality allows standard drilling equipment to achieve the performance of specialized displacement pile equipment, maintaining both simplicity and reliability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10190280B2Drill tip for foundation pile

Publication Date: 2019.01.29 FOUND CONSTRS

AI summary

An improved drill tip 110 for a foundation pile includes a soil penetrating body 112 depending from a pile attachment structure 114, the soil penetrating body having a plurality of circular stepped flights 116 formed in the shape of a descending continuous conic spiral and having a continuous spiral-shaped lower face 120 and a spiraling outer face 122, a spiral flight 124 extending radially from the lower end 126 of the outer face 122 in linear alignment with the lower face 120, and an upper flight 128 extending radially from the pile attachment structure.