Pre-Fabricated Reinforcement Cage Alignment for Precise Rebar Assembly
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Solution Overview
Problem
Conventional construction methods for connecting column steel bars in buildings are time-consuming and prone to deviations during manual assembly, leading to skewed reinforcement cages and imprecise connections.
Innovation Solution
A pre-fabricated reinforcement cage structure with a rebar-mounting frame and couplers that align rebars precisely in both horizontal and vertical directions, allowing for efficient hoisting and assembly by securing rebars to mounting frames and using couplers for precise connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual connection methods are used to connect column steel bars, then flexibility in assembly is maintained, but connection precision and assembly time are compromised
Solution Approach 1:
The reinforcement cage is pre-assembled with mounting frames attached to the rebars before hoisting. The mounting frames are preliminarily positioned on the rebars with alignment features (notches, positioning plates) that ensure precise alignment when the cage is hoisted into place, eliminating the need for time-consuming manual alignment adjustments during assembly.
Solution Approach 2:
The mounting frame acts as an intermediary device between the rebar and the connection process. It provides a standardized interface with alignment features that facilitate precise connection of the rebars to the column, while also serving as a hoisting attachment point. This intermediary structure enables both precision and efficiency.
2Manufacturing precision
If manual screwing of threaded sections is used to connect rebars, then adaptability is maintained, but deviation control and connection precision deteriorate
Solution Approach 1:
The mounting frame includes self-aligning features such as notches that fit over positioning plates, and positioning plates with predefined orientations. When the reinforcement cage is hoisted, these features automatically align the rebars in the correct orientation and position without requiring manual adjustment, making the system self-aligning and eliminating the need for operator intervention for precision alignment.
3Productivity
If pre-fabricated reinforcement cages are used, then assembly speed is improved, but connection precision may be compromised without proper mounting structures
Solution Approach 1:
The mounting frames are pre-attached to the rebars during the pre-fabrication process. This preliminary action ensures that when the cage is hoisted and assembled, the alignment features are already in place to guide precise connection, maintaining both the speed benefits of pre-fabrication and the precision requirements.
Data Source
AI summary
A pre-fabricated reinforcement cage structure and a method of hoisting and assembling the same are provided. The pre-fabricated reinforcement cage structure comprises: a pre-fabricated reinforcement cage, a plurality of couplers, and a first rebar-mounting frame. The first rebar-mounting frame comprises a first top, a first bottom plate and a first lateral plate. The first top has a plurality of notches formed along an edge of the first top plate, and each of the plurality of the notches is configured to receive a first end portion of the corresponding one of the plurality of rebars in the pre-fabricated reinforcement cage. A first end portion of each of the plurality of rebars abuts against a first top surface of the first bottom plate. Each of the first top plate and the bottom plate is connected to the first lateral plate.