Flexible Boot Coupler for Concrete Duct Sealing
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Solution Overview
Problem
Existing coupler systems for precast concrete segmental structures face challenges in sealing duct ends, accommodating misalignments, and allowing for angled duct configurations, leading to potential liquid intrusion and incomplete grouting.
Innovation Solution
A coupler apparatus featuring flexible boots with annular sections and U-shaped grooves, allowing for angular and longitudinal movement of ducts, combined with clamping mechanisms for secure liquid-tight seals, and gaskets to accommodate misalignments and angled duct configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid coupler systems are used to join duct ends, then structural strength is improved, but adaptability to misalignments and angled configurations deteriorates
Solution Approach 1:
The patent employs flexible boots made of elastomeric material that extend over the duct ends. These flexible boots can deform and accommodate angular and longitudinal misalignments between adjacent ducts while maintaining the liquid-tight seal. The flexibility allows the coupler system to adapt to various duct orientations and construction tolerances without compromising the sealing function.
2Reliability
If complex sealing mechanisms are used to prevent liquid intrusion, then reliability of sealing is improved, but device complexity increases
Solution Approach 1:
The flexible boot itself serves as the primary sealing element, eliminating the need for additional complex sealing components. The elastomeric material naturally conforms to the duct surface and maintains contact under various conditions, providing reliable liquid-tight sealing through its inherent flexibility and elastic properties rather than through complex mechanical sealing arrangements.
Solution Approach 2:
The flexible boot automatically adjusts and seals itself against the duct end through its elastic properties. When installed, the boot's natural elasticity creates a tight fit around the duct, and any misalignment or movement is automatically compensated by the material's ability to deform and return to its original shape, providing self-adjusting sealing without external intervention or complex mechanisms.
3Manufacturing precision
If fixed-position couplers are used, then manufacturing precision is improved, but ease of operation during installation deteriorates
Solution Approach 1:
The coupler system transitions from a fixed-rigid connection to a dynamic flexible connection. The flexible boot allows for angular and longitudinal movement, enabling installers to connect ducts at various angles and positions without requiring precise pre-alignment. This dynamic capability significantly simplifies the installation process while the boot's design maintains consistent sealing performance throughout its range of motion.
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
Ensures effective sealing against liquid intrusion, facilitates easy installation and manufacturing, and adapts to various duct orientations, enhancing the durability and reliability of precast concrete segmental structures.
Implementation Method 1
a gasket received in the connectors of the first and second coupler members for forming a liquid-tight seal between the first and second ducts
Implementation Method 2
a flexible boot extending therefrom in which the flexible boot has an end extending over and around the exterior surface of the first duct
Implementation Method 3
clamping mechanisms for secure liquid-tight seals
Data Source
AI summary
A coupler apparatus for use with concrete segments has a first duct, a first coupler member having a connector and a flexible boot extending therefrom and having an end extending over a surface of said first duct, a second duct, a second coupler member having a connector and a flexible boot extending therefrom and extending over an exterior surface of the second duct, and a gasket received in the connectors of the first and second coupler members for forming a liquid-tight seal between the first and second ducts. Clamps are affixed over the ends of the flexible boot so as to establish a liquid-tight seal with the respective ducts. The connector includes an annular section affixed to an end of the flexible boot and an annular groove formed around this annular section.