Interference-Fit Sleeve Coupling for Compact Rebar Splices
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Solution Overview
Problem
Existing coupling devices face challenges in efficiently joining elongated elements in reinforced concrete applications due to dimensional constraints, axial stress resistance, and material compatibility, often leading to reduced structural efficiency and increased costs.
Innovation Solution
A coupling device comprising a sleeve with deformation means that cause local deformation of the sleeve and elongated element, providing a strong and ductile connection through interference fits, which can be tuned for specific applications by varying the geometry and material properties of the deformation means and sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coupling device is designed to meet specific dimensional requirements (not protruding beyond transverse reinforcing bars), then the coupling device can be installed without interfering with the reinforcing bar cage, but the coupling device length becomes constrained and may require special transverse bar sets or reduced longitudinal bar spacing
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the coupling device, specifically designing it with a length less than the spacing between transverse steel bars (typically 150mm or greater). This parameter optimization allows the coupling device to fit between transverse bars without interference, eliminating the need for special transverse bar sets or reduced longitudinal bar spacing, thereby resolving the contradiction between ease of installation and device length constraints
Solution Approach 2:
The patent employs local quality by creating localized deformation zones within the coupling device where material deformation occurs at specific positions to achieve coupling. This localized approach allows the majority of the coupling device to maintain a compact form factor that fits within the constrained dimensional space between transverse bars, while still providing sufficient coupling length at the critical deformation zones
2Strength
If the coupling device uses material deformation to achieve coupling, then the connection strength and ductility are improved, but the manufacturing complexity and precision requirements increase
Solution Approach 1:
The patent applies self-service by designing the coupling device with self-deforming features that automatically create the necessary local deformations during installation without requiring external machining or precise pre-forming. The deformation means (such as protrusions or keys) are designed to induce controlled plastic deformation in the sleeve and elongated element when assembled, allowing the device to self-adjust and self-lock through material flow, thereby achieving strong ductile connections while minimizing manufacturing precision requirements
Solution Approach 2:
The patent utilizes parameter changes by controlling the material properties and geometric parameters of the deformation means to achieve optimal deformation behavior. By selecting appropriate material hardness, deformation zone geometry, and interference fit parameters, the device achieves reliable local deformation during assembly that creates strong mechanical interlocking, while keeping manufacturing processes simple and tolerance requirements moderate
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
The solution enables efficient coupling of elongated elements with improved axial stress resistance and material compatibility, maintaining structural integrity and efficiency while minimizing the need for special design or materials, thus reducing costs and enhancing the performance of reinforced concrete structures.
Implementation Method 1
at least one deformation means fitted with interference between, and causing local deformation about, at least part of the inner surface of the sleeve and/or an adjacent outer surface of the at least one elongated element
Implementation Method 2
The coupling device may utilise material deformation on assembly in order to achieve coupling
Data Source
AI summary
Described herein is a coupling device, associated parts and a method of use thereof. In one aspect, a coupling device is described comprising a sleeve with an inner surface that encloses at least part of at least one elongated element to be coupled; and at least one deformation means fitted with interference between, and causing local deformation about, at least part of the inner surface of the sleeve and/or an adjacent outer surface of the at least one elongated element. A deformation means insertion tool, a coupling sleeve, a deformation means, and a method of coupling at least one element are also described. The described coupling device, associated parts and a method of use offer the ability to couple together different elements in a strong and/or ductile manner, coupling being tuneable as needed to suit the preferred application. The coupling described may overcome art issues associated with bulky size of coupling, in particular, radial protrusion. The coupling may also increase the coupling force therefore increase the load that may be managed across the coupling device. Further, the way the parts are assembled may minimise generation of localised points of stress therefore also increasing the load that may be managed across the coupling device.