Wire-Loop Reinforcing Mesh Assembly for Dynamic Load Fatigue
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Solution Overview
Problem
Welded reinforcing steel bar meshes are not suitable for reinforced concrete components subjected to non-static loads, as they suffer from material fatigue due to localized stress concentrations at weld seams, leading to reduced fatigue strength and increased steel consumption.
Innovation Solution
A machine that produces uniaxial reinforcing steel bar meshes by fastening reinforcing bars to wide, flat support strips using a wire loop connection, which provides a durable and directionally stable bond without the need for welding, allowing for the use of non-weldable materials and reducing material consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If welded connections are used to join reinforcing bars to support strips, then the production speed and automation level increase, but the fatigue strength decreases due to stress concentrations at weld seams
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a mechanical binding system using wire loops. The wire is fed through a rotating unit that forms loops around the reinforcing bar and support strip intersection, creating a mechanical connection that avoids weld-induced stress concentrations while maintaining production efficiency through automated wire feeding and loop formation.
Solution Approach 2:
The wire loop acts as an intermediary element between the reinforcing bar and support strip. Instead of directly joining the main structural components through welding, the wire serves as a mediating connector that binds them together mechanically, distributing stresses more evenly and eliminating the harmful notch effect at weld seams.
2Ease of manufacture
If welded reinforcing steel meshes are used for dynamic loads, then the production cost decreases, but the material fatigue increases due to stress concentrations
Solution Approach 1:
The patent substitutes the welding process with a mechanical wire-binding system. The rotating unit automatically forms wire loops around the intersection of reinforcing bars and support strips, providing a fatigue-resistant mechanical connection that is equally efficient in terms of production cost while eliminating the harmful effects of weld-induced stress concentrations.
3Reliability
If wire binding is used to connect reinforcing bars and support strips, then the fatigue strength increases by avoiding weld seams, but the production time increases due to manual connection processes
Solution Approach 1:
The wire binding system is designed to be self-acting through the rotating unit that automatically feeds the wire, forms loops around the reinforcing bar and support strip intersections, and secures the connection without manual intervention. This automation maintains production speed while achieving the fatigue strength benefits of wire binding by eliminating weld seams.
Solution Approach 2:
The patent replaces manual wire binding operations with an automated mechanical system. The rotating unit mechanically performs the wire feeding, loop formation, and tightening operations, substituting manual labor with an efficient mechanical process that achieves both the fatigue strength of wire binding and the productivity of automated systems.
4Quantity of substance
If welded meshes are used for non-static loads, then the steel consumption decreases, but the directional stability decreases due to lack of firm bond
Solution Approach 1:
The wire loop serves as an intermediary binding element that creates a firm mechanical bond between the reinforcing bar and support strip. This intermediary connection provides superior directional stability compared to welding by mechanically interlocking the components, preventing relative movement and maintaining the geometric integrity of the mesh under dynamic loads while using efficient material quantities.
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 machine achieves a precise, durable, and cost-effective connection between reinforcing bars and support strips, enhancing the fatigue strength and directional stability of the meshes, making them suitable for structural components under dynamic loads.
Implementation Method 1
the rotating unit twists the two binding wire strands located on a side of the plane together and cuts them to length
Implementation Method 2
a binding wire guide unit which is arranged on the opposite side of the plane and which frictionally feeds out and holds a binding wire fed thereinto by the binding wire conveyer in a direction reverse to the infeed direction
Implementation Method 3
the rotating unit and the binding wire guide unit are moved towards each other in a closing manner to form a wire loop connecting the support strip and the reinforcing bar in such a manner that the support strip and the reinforcing bar are pressed against each other
Data Source
AI summary
A machine and a method for producing uniaxial reinforcing steel bar meshes, in particular for uses with not predominantly static load, has reinforcing wires which are fastened to support strips by individual wire tying.