Anchoring Assembly with Coupled Rod and Cutting Thread for Deep Boreholes
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Solution Overview
Problem
Existing anchoring solutions for deep drilling in materials like concrete require high manufacturing effort, are expensive, and risk damage due to overstressing during installation.
Innovation Solution
A robust anchoring unit is created by non-detachably coupling a tension/compression element to an anchoring element, allowing them to be manufactured separately with reduced effort and then joined, featuring a torque-transmitting connection and a stepped borehole design for easier installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anchoring elements are screwed into deep boreholes using self-tapping threads, then anchoring is achieved in hard materials like concrete, but the manufacturing effort is enormous and the elements are expensive to manufacture
Solution Approach 1:
The anchoring system is divided into separate components: a tension/compression element and an anchoring element. These can be manufactured independently using simpler, less expensive processes, then assembled together. The anchoring element features a cutting thread designed for deep boreholes while the tension/compression element can be produced by standard rod manufacturing methods.
Solution Approach 2:
The cutting thread on the anchoring element is pre-designed with optimized geometry for deep borehole penetration. The thread profile and spacing are predetermined to reduce manufacturing complexity while ensuring reliable anchoring in hard materials. This preliminary design allows for standardized production of the anchoring element.
2Reliability
If anchoring elements are screwed into deep boreholes, then anchoring is achieved, but the effort involved in producing the anchoring unit is high and there is risk of damage due to overstressing
Solution Approach 1:
By separating the anchoring function from the tension/compression function into distinct elements, each component can be optimized and manufactured independently. The anchoring element handles the complex interaction with the borehole wall while the tension/compression element maintains simple structural geometry, reducing overall production complexity.
Solution Approach 2:
The anchoring element acts as an intermediary between the borehole wall and the tension/compression element. It absorbs the complex stresses of anchoring in hard material, protecting the tension/compression element from overstressing while simplifying the manufacturing of each individual component.
3Reliability
If anchoring elements are designed for deep boreholes, then anchoring capability is improved, but the turning resistance when turning in the element increases
Solution Approach 1:
The cutting thread geometry is optimized with specific local characteristics: thread angle, pitch, and profile are varied along the length of the anchoring element. The upper portions have geometry optimized for cutting through hard material, while lower portions are designed to reduce friction and turning resistance during installation in deep boreholes.
Solution Approach 2:
The thread parameters (pitch, angle, depth) are changed along the length of the anchoring element to balance anchoring capability with turning resistance. The cutting thread starts with aggressive geometry for material removal and transitions to smoother geometry deeper in the borehole, reducing the torque required for installation.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
An anchoring unit for anchoring in a borehole (3) in a material (2) comprises an anchoring element (6) with a base body (12) having a longitudinal axis (13) and with a cutting thread (7) arranged on the base body (12) for cutting into an inner wall of the borehole (3). The anchoring unit further comprises a tension/compression element (8) attached to the base body (12), the outer diameter of which is smaller than a cutting thread diameter of the cutting thread (7) and wherein the tension/compression element (8) extends parallel to the longitudinal axis (13).