Reinforcing Bar Connector with Anti-Rotation Holder
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Solution Overview
Problem
Existing methods for connecting reinforcing bars in concrete construction face challenges such as loose tolerances leading to longitudinal movement and slippage, especially with coarse threaded bars, and difficulties in installation where rotation is restricted or gaps need to be bridged, resulting in increased costs and complexity.
Innovation Solution
An apparatus comprising a base, a holder for preventing rotation of the reinforcing bar, a support for a driving tool, and a brace to secure the support against movement, utilizing a predetermined torque threshold and a torque multiplier to ensure a secure fit with minimal slip, accommodating various bar sizes and allowing for gap bridging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cast construction with sand core is used for threaded fittings, then cost is reduced, but manufacturing precision of internal thread deteriorates
Solution Approach 1:
The system segments the connection components into externally threaded reinforcing bar and internally threaded fitting, where the fitting is formed as a single integrated piece rather than cast with a sand core. This eliminates the need for core removal and improves thread accuracy while maintaining cost-effectiveness through direct forming processes.
Solution Approach 2:
The invention uses a precision-machined or formed internal thread in the fitting that accurately replicates the external thread profile of the reinforcing bar. This precise copying of the thread form ensures tight engagement and minimizes longitudinal movement, resolving the precision issue while keeping the fitting construction simple and cost-effective.
2Ease of operation
If coarse external thread is used on reinforcing bar, then ease of fitting application is improved, but longitudinal free-play increases
Solution Approach 1:
The invention modifies the thread parameters by using a precisely formed internal thread in the fitting that complements the coarse external thread on the bar. The internal thread is formed to exact tolerances with proper pitch and profile, creating a tight engagement that minimizes longitudinal free-play while maintaining the ease of application provided by the coarse external thread.
3Adaptability or versatility
If rotation of reinforcing bar is restricted, then installation in restricted spaces is enabled, but torque application becomes difficult
Solution Approach 1:
Instead of rotating the reinforcing bar to tighten the fitting, the invention enables the fitting to be rotated onto the stationary bar. The holder clamps the bar firmly in place, and the driving tool rotates the fitting onto the bar's external thread, applying torque in the opposite direction from conventional methods. This inversion solves the problem of restricted bar rotation while maintaining ease of torque application.
4Adaptability or versatility
If gap bridging is required between reinforcing bars, then installation flexibility is improved, but device complexity increases
Solution Approach 1:
The holder and driving tool assembly is designed as a universal system that can accommodate various bar sizes and configurations. The holder's clamping mechanism and the driving tool's socket attachment can handle different fitting types and bar diameters, enabling gap bridging and other specialized installations without requiring complex custom equipment. The system's multi-functionality resolves the complexity issue while maintaining installation flexibility.
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 apparatus effectively secures threaded fittings to reinforcing bars with minimal slip, accommodating loose tolerances and restricted rotation, while enabling efficient installation without modifying the bars, thus reducing installation time and costs, and ensuring compliance with construction standards.
Implementation Method 1
a driving tool for threadedly driving the threaded fitting onto an end portion of the reinforcing bar
Implementation Method 2
threaded fitting onto an end portion of the reinforcing bar
Implementation Method 3
a brace for bracing the support against movement relative to the base
Implementation Method 4
a holder for holding the reinforcing bar against rotation relative to the base
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An apparatus for connecting reinforcing bar to a threaded fitting, the apparatus including a base, a holder for holding the reinforcing bar against rotation relative to the base, and a support for a driving tool for threadedly driving the threaded fitting onto an end portion of the reinforcing bar, wherein the apparatus includes a brace for bracing the support against movement relative to the base.