Oval Rebar Bolt Manual Bending Mechanism
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Solution Overview
Problem
Existing methods for bending rebar bolts in the mining industry are labor-intensive, costly, and alter the steel properties, making them inefficient for ground reinforcement, especially in low-seam mining where machinery and heat deformation are required.
Innovation Solution
A manually bendable rebar bolt with an oval cross-sectional area, allowing for controlled bending without additional modifications, formed by heating and rolling steel into an elliptical shape that maintains strength and meets regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rebar is deformed to narrow section to facilitate bending, then bending becomes easier, but steel property characteristics are changed
Solution Approach 1:
The rebar is pre-notched during manufacturing to create a localized thin section that facilitates bending. This preliminary action prepares the rebar for easy field bending without requiring additional modifications or heating operations, while maintaining the bulk material properties through controlled local material removal rather than global thermal processing
Solution Approach 2:
The rebar features a localized notched section with reduced thickness at a specific location, creating a hinge area with different geometric properties from the rest of the bar. This local quality change enables bending at the notched section while the majority of the rebar maintains its original strength characteristics and material properties
2Ease of operation
If hot-notch process is used to facilitate bending, then bending becomes possible, but labor and equipment costs increase
Solution Approach 1:
The notching is performed during the rebar manufacturing process using conventional forming equipment, rather than requiring separate field heating and stamping operations. This preliminary action eliminates the need for complex hot-notch machinery at the mining site and reduces both equipment complexity and operational costs
Solution Approach 2:
The invention replaces the thermal-mechanical hot-notch process (heating followed by hydraulic stamping) with a purely mechanical forming process during manufacturing. The rebar is cold-formed with a notched section using conventional rebar processing equipment, eliminating the need for heating units and high-impact hydraulic rams
3Strength
If rebar is bent manually without modification, then material properties are preserved, but bending is difficult or impossible for larger diameters
Solution Approach 1:
A notched section with reduced thickness is created at a specific location on the rebar, providing a localized hinge area that facilitates bending. This local geometric modification enables manual bending of larger diameter rebars while the majority of the rebar maintains its original material properties and strength characteristics
Solution Approach 2:
The notched section is pre-formed during manufacturing to create a predetermined bending location with reduced material thickness. This preliminary preparation allows field operators to easily bend the rebar at the notched section without requiring additional modifications, heating, or specialized equipment
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 oval rebar bolt can be manually bent to suit specific mining heights, maintains material properties, and exceeds strength requirements, with tests showing equal or better performance compared to standard round bars, and meets ASTM F432-13 standards for yield and tensile strength.
Implementation Method 1
heating the bar in a separate process and stamping it with a high impact hydraulically operated ram
Implementation Method 2
stamping it with a high impact hydraulically operated ram. This process, called 'Hot-Notching,' consists of a specially designed heating unit for gas or induction heating
Data Source
AI summary
The present invention is a manually bendable rebar bolt for use in ground reinforcement, particularly in mining operations. The rebar bolt is a steel rod having a length and a width. The cross-sectional area of the bolt taken along the width generally perpendicular to said length has a long axis and a short axis. The bendable rebar bolt can be manually bent in a direction generally perpendicular to said long axis.