Automated Rebar Array Assembly for On-Site Concrete Casting
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Solution Overview
Problem
The construction of rebar arrays for reinforced concrete is inefficient and costly due to the need for manual handling and placement of heavy, unwieldy rebars, especially in large or dense projects like nuclear power plants, where transportation and on-site assembly are impractical and pose safety risks.
Innovation Solution
A method involving automated tools such as rotary cassettes, bar cassettes, and clamps on a lifting frame to position and space rebars efficiently, using splitting apparatuses and conveyor belts to manage rebar bundles and position arrays accurately, allowing for on-site construction without welding or tie wires, thus reducing material usage and transportation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rebar is transported to construction site in bundles and manually positioned, then rebar arrays can be constructed, but the process is inefficient, costly, and poses safety risks due to heavy manual handling
Solution Approach 1:
The rebar array is segmented into individual rebar elements that can be independently positioned by robotic manipulators. Each rebar is placed separately at predetermined locations rather than handling entire bundles manually, enabling automated construction while maintaining the ability to construct large-scale arrays efficiently
Solution Approach 2:
The rebar elements are designed with self-positioning features including deformation patterns and ribs that facilitate automatic binding into concrete. The rebars self-align and self-secure within the array structure without requiring manual adjustment during construction, enabling the robotic system to achieve precise positioning with single placement actions
2Ease of manufacture
If rebar arrays are constructed off-site and transported to construction site, then assembly is simplified, but transportation becomes impractical for large or dense arrays due to weight and size
Solution Approach 1:
The rebar array construction process is segmented into modular units where individual rebars or small groups are positioned and secured independently. This segmentation enables the array to be constructed incrementally on-site rather than as a single heavy unit, eliminating transportation constraints while maintaining construction efficiency through standardized placement procedures
Solution Approach 2:
Rebar arrays are pre-designed with predetermined spacing, positioning, and binding configurations determined before construction. This preliminary planning enables robotic manipulators to automatically position and secure each rebar without real-time human intervention, achieving off-site level precision while constructing on-site, thereby avoiding transportation of heavy pre-assembled arrays
3Strength
If rebar arrays are constructed with high density and large size for nuclear power plants, then structural strength is improved, but transportation and on-site handling become increasingly difficult
Solution Approach 1:
The robotic manipulator system performs self-positioning and self-securing of each rebar element through automated binding mechanisms. The system independently handles high-density array construction without requiring external assistance for positioning or securing, enabling the construction of large-scale, high-strength arrays that would be impossible to handle manually while maintaining operational efficiency
Solution Approach 2:
Manual mechanical handling of heavy rebar arrays is replaced with an automated robotic manipulator system that uses controlled mechanical forces and automated binding mechanisms. This substitution enables the construction of high-density, large-scale arrays with precise positioning and secure binding without the physical limitations of manual handling, achieving both structural strength and operational ease
Data Source
AI summary
Rebar, also referred to as reinforcing bar, is typically used to reinforce concrete to improve the tensile strength of elements made of concrete when constructing buildings, factories, bridges, nuclear power plants and other structures. There is a method of constructing an array (711) of rebars, the method comprising: automatically positioning a plurality of rebar such that they are spaced apart from one another to form an array (711); using an array interval spacing means (709) to maintain the spatial relationship of the rebar in the array; releasing the array from the array interval spacing means such that the array is placed in a target location and orientation for casting into concrete; and removing the array interval spacing means.