Precast Shear Wall Connection Using Automated Connecting Bars
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Solution Overview
Problem
Current methods for connecting precast shear walls rely on labor-intensive and time-consuming on-site processes, particularly the cast-in-situ joint method, which hampers the mechanization benefits achieved in the production, transportation, and installation stages, leading to inefficiencies and delays.
Innovation Solution
A system comprising horizontal and vertical reinforcement bars with connecting tubes and grout tubes, along with a connecting device and driving mechanism that allows for automated translation of connecting bars between precast shear walls, eliminating the need for in-situ concrete and reducing labor dependency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cast-in-situ joint method is used to connect precast shear walls, then wall connection strength is ensured, but labor intensity and construction time increase significantly
Solution Approach 1:
The connecting bars are pre-installed within the connecting tubes during the precast wall manufacturing process, before the walls are transported to the construction site. This preliminary action eliminates the need for on-site concrete pouring and significantly reduces construction time while ensuring connection strength through factory-controlled precision.
Solution Approach 2:
The traditional mechanical process of pouring concrete, vibrating, and curing on-site is replaced by a pre-fabricated mechanical connection system. The connecting bars with connecting tubes provide a ready-made mechanical joint that eliminates labor-intensive on-site concrete work while maintaining structural strength.
2Reliability
If cast-in-situ joint method is used, then connection reliability is achieved, but on-site labor requirements increase
Solution Approach 1:
All connection components (connecting bars, connecting tubes) are pre-assembled and positioned during factory production. This preliminary action ensures reliable connections are pre-established with precision control, while on-site operations are simplified to merely inserting the pre-fabricated connecting bars into the connecting tubes without requiring concrete pouring or complex labor.
3Productivity
If precast walls are produced horizontally, then production efficiency improves, but wall-to-wall connection complexity increases
Solution Approach 1:
The connection system is segmented into discrete, pre-fabricated components: connecting tubes integrated into the precast walls and separate connecting bars. This segmentation allows each component to be manufactured independently with high precision in the factory, maintaining production efficiency while simplifying the overall connection process through modular assembly on-site.
Data Source
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AI summary
The system according to the invention comprises a plurality of horizontal and vertical reinforcement bars configured within the precast shear wall. Specifically, the reinforcement bars are provided with spacing there between. The system furthermore comprises a plurality of connecting tubes fixed between the spacing provided between the reinforcement bars, a plurality of openings provided between the plurality of connecting tubes, a plurality of grout tubes fixed above the plurality of openings in order to grout the openings after completing confection of the shear walls, a plurality of connecting bars capable of being inserted within the connecting tubes of the precast shear wall, when erected, a connecting device for inserting through the openings to grip the connecting bars; and a driving device to supply power to the drive for causing rotation of the drive and thereby sending the connecting bar in a translational motion from the first shear wall to the second shear wall.