Removable Strand Pressure-Pipe Anchor Design
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Solution Overview
Problem
Existing strand pressure-pipe anchors are complex and costly to remove due to the need for multiple components and specialized measures to release tensile stress, posing a risk to personnel and complicating construction processes.
Innovation Solution
A fully removable strand pressure-pipe anchor design featuring crimp sleeves with external threads that screw into the compression anchor base element, allowing for simple unscrewing of tension strands, and a simplified construction with fewer components, including a sheath to prevent grouting material penetration and enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional strand pressure-pipe anchors are used, then anchoring forces can be transmitted to the substratum, but the anchors are complex and costly to remove due to multiple components and specialized measures
Solution Approach 1:
The anchor system is divided into separable components: a removable tension element and a remaining anchor base element. The tension element can be completely extracted from the substratum while the anchor base element remains to maintain anchoring functionality.
Solution Approach 2:
The tension element is extracted from the anchor system after use. The anchor base element remains in the substratum while the tension element is completely removed, eliminating the need for complex destruction or cutting operations.
2Ease of operation
If anchor strands are placed under tensile stress during removal to cause break point failure, then the anchor can be removed, but this leads to the anchor strand shooting out and creates injury risk
Solution Approach 1:
The predetermined break point, which could cause dangerous strand ejection, is converted into a beneficial feature. The break point is designed to fail in a controlled manner that facilitates removal without shooting the strand outward, transforming a harmful effect into a useful one.
Solution Approach 2:
The break point is pre-designed and pre-positioned during manufacturing. This preliminary action ensures that when tensile stress is applied during removal, the failure occurs at the predetermined location in a controlled manner, preventing uncontrolled strand ejection and associated injury risks.
3Ease of operation
If the grout region is destroyed to remove the anchor strand completely, then full removal is achieved, but special provisions are required that complicate the construction
Solution Approach 1:
The tension element is extracted from the grout body through a designed extraction path. The anchor base element remains anchored in the grout while the tension element is completely removed, achieving full removal without requiring destruction of the grout region.
Solution Approach 2:
A release mechanism or intermediate structure is provided that allows the tension element to be freed from the grout body without destroying the grout. This intermediary facilitates controlled extraction while preserving the integrity of the surrounding grout structure.
4Reliability
If safety nets and complex measures are used to reduce injury risk during anchor removal, then personnel safety is improved, but the measures are costly and cannot entirely eliminate risk
Solution Approach 1:
The inherent characteristics of the anchor design, including the predetermined break point and tension element configuration, are converted into safety features. The removal process is designed to fail safely without requiring external safety nets or complex protective measures, eliminating risk at the source rather than managing it.
5Ease of operation
If the anchor strand is weakened during manufacture by inductive heating, then a predetermined break point is created for removal, but the total carrying capacity of the anchor strand decreases
Solution Approach 1:
The anchor strand has non-uniform properties along its length. A predetermined break point with reduced cross-section or increased brittleness is created at a specific location through inductive heating, while the remaining portions maintain full strength. This local quality change enables controlled failure at the break point without significantly affecting the overall carrying capacity.
Data Source
AI summary
A strand pressure-pipe anchor comprises a compression anchor base element, a tension strand or a plurality of tension strands, and at least one sheath, in which the tension strand or at least one of the tension strands is received. The tension strand or at least one of the tension strands is provided, at the end thereof associated with the compression anchor base element, with a crimp sleeve, which is provided with an external thread, which, in a connected state of the tension strand and the compression anchor base element where the tension strand is connected to the compression anchor base element to pass on the anchoring forces to the surrounding substratum, is in screw engagement with an internal thread of the compression anchor base element.