Tendon Encapsulation Components for Prestressed Concrete Sealing
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Solution Overview
Problem
Current prestressed concrete systems face issues with low-quality seals, inefficient corrosion protection, insecurity during cutting operations, high costs, labor complexity, and excessive plastic waste, due to improvisation and inadequate standardized procedures in the encapsulation and anchoring processes.
Innovation Solution
A set of optimized components and tools for the greased mono-tendon prestressing system, including an elongated cap with conical nozzle, plastic fasteners, and a self-supporting grease plug, ensures effective sealing, secure tendon positioning, and controlled corrosion protection, reducing labor intensity and plastic waste while enhancing safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If improvisation and non-standardized procedures are used in encapsulation and anchoring processes, then labor flexibility is increased, but sealing quality and corrosion protection efficiency deteriorate
Solution Approach 1:
The system divides the encapsulation process into distinct functional components: anchor plates with integrated sealing elements, pre-fabricated tendon assemblies with grease plugs, and modular pocket forms. Each segment performs a specific function (sealing, greasing, positioning) that collectively ensures high-quality corrosion protection while maintaining standardized operational procedures.
Solution Approach 2:
Grease plugs are pre-installed in tendon sheaths before concreting, and anchor plates are pre-positioned with sealing sleeves in place. This preliminary action ensures that sealing is established before concrete placement, preventing cream intrusion and eliminating the need for improvised post-concreting sealing measures.
2Device complexity
If improvised sealing methods are used, then device complexity is reduced, but corrosion protection effectiveness deteriorates
Solution Approach 1:
The sealing system employs nested protective elements: grease plugs are inserted inside tendon sheaths, which are then enclosed by anchor plates with integrated sealing sleeves. This nested arrangement creates multiple barriers against corrosion without requiring complex external sealing systems, as each layer protects the previous one.
Solution Approach 2:
Anchor plates are designed with self-sealing capabilities through integrated sealing sleeves and grease retention features. The system automatically maintains its sealing function through the self-supporting grease plug that retains lubricant without additional mechanical fastening, eliminating the need for complex external sealing mechanisms.
3Adaptability or versatility
If non-standardized procedures are used, then adaptability to site conditions is improved, but installation time and labor costs increase
Solution Approach 1:
The anchor plate assembly serves multiple functions simultaneously: structural anchoring, sealing against concrete cream, grease retention, and tendon positioning. This multi-functionality eliminates the need for separate improvised components for each function, standardizing the installation process while maintaining adaptability to various site conditions through the universal applicability of the integrated system.
Solution Approach 2:
Multiple previously separate functions (anchoring, sealing, greasing, positioning) are merged into a single integrated anchor plate assembly. This consolidation reduces the number of separate installation steps and eliminates the need for improvised procedures between different operations, thereby increasing installation speed while maintaining site adaptability.
4Ease of manufacture
If inadequate standardized procedures are used, then initial material costs are reduced, but long-term durability and maintenance costs deteriorate
Solution Approach 1:
The system provides beforehand cushioning against corrosion by pre-installing grease plugs and sealing elements before concreting. This prior protective measure prevents concrete cream from reaching and corroding the tendon and anchor plate, ensuring long-term durability without requiring expensive remedial treatments or premature replacements.
Solution Approach 2:
The system employs composite protective mechanisms combining grease lubrication, rubber sealing sleeves, and metal anchor plates with corrosion-resistant properties. This composite approach provides superior and durable corrosion protection compared to single-material improvised solutions, ensuring long-term structural integrity while maintaining cost-effectiveness.
Data Source
AI summary
This patent refers to improvements introduced in the encapsulation technique regarding the field of tendons with anchor plates and anchor tensors, applied in the construction system of prestressed concrete in its assembly, demoulding, tensioning and final finishing with obtaining anticorrosion protection of metal parts through a set of improved components applied to the current processes and an innovative process that will ensure the seal against entry of concrete cream into the greased system during the assembly of the system, in forms prior to concreting, which will also ensure their perpendicularity to the shape and bringing advantages that will increase the speed of installation, speed of calculation response, speed in the installation of hydraulic jacks for tensioning the pull rods, ease application and perfect fittings in the tools, improvement of the finishing process ensuring thus effective protection for durability, reuse of components, increased safety at work and elimination of all improper process that occurs in the preparation and fixing of the anchor plate and subsequent closing and finishing.