Multi-Tendon Cable Anchoring Segmented Injection
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Solution Overview
Problem
Existing anchoring methods for structural cables face challenges in ensuring complete filling of channels with protective material, leading to potential corrosion of metallic tendons due to voids and uneven flow paths, especially when communication channels are present, which complicates the protection of tendons from environmental exposure.
Innovation Solution
A method involving two injection phases is employed, where the first phase fills individual channels with a controlled amount of protective material using a bell-shaped cover, and the second phase fills separate chambers with potentially different protective materials, optimizing the filling process and minimizing voids by ensuring each part of the anchorage receives the appropriate protective material based on desired functionalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective material is injected into channels containing tendons, then corrosion protection is improved, but incomplete filling occurs due to competing flow paths and head loss variations
Solution Approach 1:
The injection process is divided into two distinct phases: first injecting protective material into the channels containing tendons, then separately injecting into chambers. This segmentation ensures each region receives adequate protection without competition from other flow paths.
Solution Approach 2:
The channels containing tendons are filled with protective material before the chambers are filled. This preliminary action ensures that the critical tendon regions are protected first, eliminating the risk of incomplete filling due to subsequent chamber injection.
2Ease of operation
If communication channels are added to allow material flow between chambers, then filling capability is improved, but flow distribution becomes uneven causing voids in tendon channels
Solution Approach 1:
The injection system is segmented into independent injection paths: one for channels and one for chambers. This eliminates the uneven flow distribution problem caused by communication channels while maintaining the ability to fill all regions.
Solution Approach 2:
The communication channels are excluded from the first injection phase. By taking them out of the active flow path during critical tendon channel filling, uniform flow distribution is maintained without interference from alternative flow paths.
3Device complexity
If single-phase injection is used to simplify the process, then device complexity is reduced, but voids remain in difficult-to-reach channel regions
Solution Approach 1:
The injection process is segmented into two phases targeting different regions sequentially. This simple yet effective approach ensures complete filling of all regions including difficult-to-reach channel areas, maintaining high reliability without complex equipment.
Solution Approach 2:
Channels are filled in a preliminary phase before chambers. This ensures that critical tendon regions receive protection first, eliminating voids in difficult-to-reach areas while using a simple two-phase process.
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 complete and optimized filling of channels and chambers, reducing the risk of corrosion and enhancing the protection and longevity of the structural cables by using the appropriate materials for each part of the anchorage, thereby improving the anchoring system's effectiveness.
Implementation Method 1
the volume containing the exposed portions of the tendons is filled with a protective material injected under pressure into the anchoring region
Implementation Method 2
injecting protective material inside the bell-shaped cover to force the protective material into the channel
Data Source
AI summary
The method is for protecting the end of a cable made of a plurality of parallel tendons (10) anchored using a block (15) having a front side, a rear side and channels (16) extending between the front and rear sides. Each tendon of the cable is held in a respective channel of the anchor block with a blocking member (19). The method comprises performing a first phase of injecting protective material (100) into at least some of the channels of the anchor block. A chamber (30) is formed on at least one side of the anchor block (15) so as to contain portions of the plurality of tendons. A second phase of injecting protective material (200) into the chamber (30) is then performed.