Hollow Drill Vacuum Suction for Clean Borehole Anchoring
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Solution Overview
Problem
Existing methods for cleaning boreholes during fastener anchoring in mineral materials are user-dependent and inefficient, leading to suboptimal adhesion of the curable mass and reduced anchoring values, as they fail to ensure complete removal of drill cuttings and dust.
Innovation Solution
A method involving a percussively and rotationally driven hollow drill that uses a vacuum source to continuously suck out drill cuttings and dust between the drill and the borehole wall while drilling, allowing for the introduction of self-hardening mortar without additional cleaning, and optionally using a suction hood and additional air flow to enhance cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical cleaning devices (brushing or blowing) are used to clean the borehole, then the cleaning process can be performed, but the degree of cleaning depends on user diligence and is not reliable
Solution Approach 1:
The drilling device performs cleaning automatically during the drilling process itself, without requiring separate manual cleaning operations. The hollow drill bit with integrated suction connection enables the system to clean the borehole autonomously as it drills, eliminating dependence on user diligence for separate cleaning steps.
Solution Approach 2:
The cleaning function is merged with the drilling function by integrating a suction connection directly into the hollow drill bit. This combination allows cuttings and dust to be removed continuously during drilling, rather than requiring separate cleaning operations after drilling is complete.
2Object-generated harmful factors
If hollow drill with air blowing is used to clean the borehole, then drill cuttings can be blown out, but the drilling dust pollutes the surrounding area
Solution Approach 1:
A vacuum source creates negative pressure to suction drill cuttings and dust through the hollow drill bit during drilling. This pneumatic system contains and removes drilling dust through controlled airflow, preventing it from polluting the surrounding area while maintaining efficient cleaning.
Solution Approach 2:
The hollow drill bit acts as an intermediary channel that guides and contains drill cuttings and dust from the borehole. By routing debris through the hollow drill bit to a collection point, the system prevents direct release of drilling dust into the surrounding environment.
3Productivity
If hollow drill with vacuum suction is used to clean the borehole, then drilling dust is removed, but the work steps of drilling and cleaning are separate processes
Solution Approach 1:
The suction connection is integrated directly into the hollow drill bit structure, merging the cleaning function with the drilling operation. This allows cuttings and dust to be removed continuously during drilling without requiring separate cleaning steps, thereby maintaining high drilling speed while achieving thorough cleaning.
Solution Approach 2:
The vacuum suction operates continuously throughout the drilling process, removing cuttings and dust as they are generated. This continuous cleaning action eliminates the need to stop drilling for separate cleaning operations, maintaining productivity while ensuring the borehole is properly cleaned.
4Strength
If smooth borehole walls are produced by sawing or grinding, then the borehole can be cleaned well by vacuuming, but the mortar adhesion is insufficient
Solution Approach 1:
The percussive drilling action creates controlled roughness and cracking on the borehole wall surface. This mechanical impact from the percussive drill generates a textured surface that enhances mortar adhesion, while the hollow drill bit simultaneously removes excess dust to maintain sufficient cleanliness for chemical anchoring.
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 method ensures a high degree of cleaning, significantly increasing anchoring strength, reducing work required, and allowing for higher specified loads, with improved productivity and safety by integrating drilling and cleaning steps, and minimizing environmental contamination.
Implementation Method 1
Sucking off any drill cuttings and drilling dust between an outer side of the hollow drill and a wall of the borehole by means of a vacuum source during drilling of the borehole
Implementation Method 2
the adhesion of the curable mass to the wall of the borehole
Data Source
Figure 1
Figure 2
AI summary
The method involves drilling a borehole (7) in a constructional component (6) with a percussively-rotationally driven hollow drill (12). The produced drillings and drilling dust are aspirated with a vacuum source (26) e.g. vacuum cleaner, between an outer side of the hollow drill and a borehole wall during drilling of the borehole. The borehole is filled with a self-hardenable mortar immediately after formation of the suction-cleaned borehole. A fastening element e.g. threaded rod, is inserted into the self-hardenable mortar. An independent claim is also included for a method for forming a cleaned borehole in a constructional component for anchoring a fastening element in a constructional component with a self-hardenable mortar.