Drilling Tool With Selectable Fluid Outlets for Soil Mixing
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Solution Overview
Problem
Existing drilling tools struggle to achieve a uniform and efficient mixing of soil material with fluid during the creation of a bore, leading to suboptimal foundation elements.
Innovation Solution
A drilling tool with multiple outlet openings along the shank, controlled by an actuating device, allows selective introduction of fluid through these openings during sinking and retraction, ensuring thorough mixing of soil material with fluid to produce high-quality soil mortar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fluid is supplied continuously through a single outlet opening during sinking-by-drilling, then the removal device can function effectively, but the mixing of soil material with fluid becomes inefficient and non-uniform
Solution Approach 1:
The single outlet opening is divided into multiple outlet openings (first outlet opening in the lower region, second outlet opening in the upper region) arranged at different axial positions along the drill shank. This segmentation allows fluid to be supplied at multiple locations, enabling better distribution and mixing of fluid with soil material throughout the bore during both sinking-by-drilling and retraction phases.
Solution Approach 2:
The system dynamically switches between different outlet openings based on the operational phase. During sinking-by-drilling, the first outlet opening is activated for fluid supply. During retraction, the second outlet opening is activated. This dynamic switching is controlled by the actuating device that responds to changes in drill shank position and rotation direction, optimizing mixing efficiency for each phase.
2Manufacturing precision
If suspension is introduced into the borehole at the lower end during retraction, then mixing can occur, but the mixing result is impaired because the drilling suspension cannot be mechanically mixed effectively when the drilling tool is pulled upwards
Solution Approach 1:
The actuating device is configured to activate the second outlet opening in advance during the retraction phase, before the drilling tool is fully pulled out of the borehole. This preliminary action ensures that fluid is supplied at the optimal location (upper region) at the optimal time, allowing effective mixing to occur during retraction without requiring mechanical mixing forces that would be unavailable during upward movement.
Solution Approach 2:
The system employs periodic action by alternating between activating the first outlet opening during sinking-by-drilling and the second outlet opening during retraction. This periodic switching is synchronized with the operational phases, ensuring that fluid supply occurs at the appropriate times and locations to maintain high-quality mixing results throughout the entire drilling cycle.
3Adaptability or versatility
If multiple outlet openings are provided along the drill shank, then fluid can be introduced at different locations for better mixing, but the device complexity increases
Solution Approach 1:
The actuating device is designed to automatically switch between the first and second outlet openings based on the operational phase (sinking-by-drilling or retraction) without requiring complex external control systems. The device self-regulates fluid supply location by responding to changes in drill shank position and rotation direction, thereby achieving high adaptability while minimizing the increase in device complexity.
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 a uniform and efficient mixing of soil material with fluid, resulting in high-quality and homogeneous soil mortar that cures to form strong foundation elements, reducing defects and improving construction quality.
Implementation Method 1
the soil material crushed by a removal device on the auger can be conveyed upwards into an upper area of the bore. During drilling, a curable suspension can be introduced via an outlet opening on the drill shank, wherein the suspension is mixed with the crushed soil material by means of mixing elements on the drill shank to produce a so-called soil mortar in situ.
Implementation Method 2
a finished soil mortar is produced, if necessary, with a further supply of drilling suspension and rotation of the drilling tool for further mixing, which can then cure for becoming the foundation element.
Data Source
AI summary
The invention relates to a drilling tool for creating a bore in the ground, having a tubular drill shank, at least one removal device which is configured to remove ground material, a supply device for supplying a fluid through the drill shank through at least one outlet opening for the fluid into the bore and at least one mixing element which extends radially to the drill shank, is arranged on the drill shank above the removal device and is configured to mix ground material with the fluid. According to the invention, it is provided that at least one first outlet opening is arranged in the region of the removal device and at least one second outlet opening is arranged at an axial distance from the at least one first outlet opening and at least one actuating device is provided on the supply device, by means of which the at least one first outlet opening and/or the at least one second outlet opening can be blocked, wherein fluid can optionally be introduced into the bore via the at least one first outlet opening and/or the at least one second outlet opening.