Drill String Anchoring Element for Percussion Drilling
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Solution Overview
Problem
Existing methods for drilling holes in soil or rock and setting anchors are time-consuming and prone to difficulties due to the separate steps of drilling and introducing anchoring devices, which can lead to blockages and unreliable anchoring, especially in firm materials.
Innovation Solution
A method where an anchoring element surrounding the drill string is frictionally inserted into the borehole during drilling and expanded after completion, allowing the drill string to be withdrawn while securing the anchor, providing a provisional and reliable anchoring effect without additional steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drill string is removed from the borehole after drilling, then the anchoring device can be introduced, but the process time increases and the borehole may be blocked by material breakage
Solution Approach 1:
The anchoring element is introduced into the borehole during the drilling process itself, before the drilling is completed. This preliminary introduction ensures the anchoring element is in place before any potential blockages occur and eliminates the need for a separate second step to introduce the anchoring device, thus resolving both the time loss and reliability issues.
Solution Approach 2:
The drilling process and anchoring element installation are merged into a single simultaneous operation. The anchoring element is carried by the drill string and introduced into the borehole during drilling, combining two separate operations (drilling and anchor installation) into one unified process, thereby eliminating additional time and reducing blockage risks.
2Reliability
If the anchoring device is introduced after drilling, then the borehole must be cleared of drilling tools, but this creates additional complexity and potential for blockages
Solution Approach 1:
The drilling operation and anchoring element installation are merged into a single simultaneous process. The anchoring element is carried by the drill string and introduced into the borehole during drilling, eliminating the need for separate steps to remove drilling tools and install anchors, thus reducing process complexity and potential blockages.
Solution Approach 2:
The anchoring element is introduced into the borehole during the drilling process itself, before drilling is completed. This preliminary introduction ensures the anchoring element is in place before any potential blockages occur and eliminates the need for a separate second step to introduce the anchoring device.
3Reliability
If the anchoring element is expanded after introduction, then reliable anchoring is achieved, but the expanding element must be precisely positioned
Solution Approach 1:
The expanding element is automatically positioned and activated by the withdrawal of the drill string itself. As the drill string is pulled out, the expanding element is carried with it and automatically expands against the borehole wall, eliminating the need for separate positioning operations and making the expansion process as easy as simply withdrawing the drill string.
Solution Approach 2:
The expanding element is pre-positioned on the drill string during drilling, ready to be activated immediately upon withdrawal. This preliminary positioning ensures the expanding element is in the correct location before the anchoring phase begins, making the subsequent expansion operation simple and reliable.
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 simplifies the anchoring process by achieving provisional securing during drilling and reliable anchoring immediately after completion, reducing time and complexity, and allows for adjustments to maintain anchoring effectiveness by expanding the anchoring element as needed.
Implementation Method 1
an anchoring element surrounding the drill string, in particular at a distance from the drill bit, is frictionally inserted into the borehole
Implementation Method 2
the anchoring element is expanded so that the drill string after completion of the borehole is withdrawn in the direction of the anchoring element and the anchoring element is expanded by an expanding element mounted on the drill string
Data Source
AI summary
The invention relates to a method and device for drilling, particularly percussion drilling or rotary percussion drilling a hole in soil or rock material and fixing an anchoring in the hole. To this end, a drilled hole is made by a drill bit (3) mounted on a drill rod (2). According to the invention, the drill rod (2), on the rear side facing away from the drilling surface (5) of the drill bit (3), is surrounded at a distance from the drill bit (3) by an anchoring element (4) whose outside dimension exceeds, at least in part, the circumference of the drilled hole made by the drill bit (3) whereby enabling a constructively easier and more reliable securing of the anchoring inside the drilled hole.