Reusable Lifting Device for Semi-Precast Beam Stirrups
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Solution Overview
Problem
Conventional methods for lifting semi-precast beams are costly due to non-reusable connectors and pose safety risks from stirrup deformation and detachment during lifting.
Innovation Solution
A lifting device with a main body, clasping assembly, and shafts that engage with loop-shaped or spiral-shaped stirrups on the beam, allowing for repeated use without deforming the stirrups, featuring through holes and a clasping mechanism to securely lift the beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-embedded connectors are used for lifting semi-precast beams, then lifting can be achieved, but the connectors are permanently buried and cannot be reused, increasing cost
Solution Approach 1:
The patent introduces a detachable lifting device as an intermediary between the crane and the beam stirrups. This lifting device with shafts and clasping assembly can be attached and detached multiple times, serving as a reusable mediator that eliminates the need for permanent embedding of connectors in the beam.
2Ease of manufacture
If stirrups are directly hooked and lifted through the crane hook, then lifting can be performed, but the stirrups may deform and the hook may detach, creating safety issues
Solution Approach 1:
The lifting device acts as a protective intermediary between the crane hook and the beam stirrups. The shafts with clasping assemblies engage with the stirrups in a controlled manner, distributing forces evenly and preventing direct hook-stirrup contact that causes deformation and detachment.
Solution Approach 2:
The lifting device incorporates movable shafts and clasping assemblies that can dynamically adjust to the stirrup positions and orientations during lifting, maintaining secure engagement while accommodating beam movements and vibrations.
Data Source
AI summary
A lifting device comprises a main body, a clasping assembly, a first shaft and a second shaft. The main body comprises a first through hole, a second through hole and a third through hole therein. The clasping assembly comprises a closed-loop structure configured to be engaged with the third through hole. The first shaft is adapted to be inserted into the first through hole of the main body, and the second shaft is adapted to be inserted into the second through hole of the main body. The main body comprises positioning slots therein and the first and the second shafts have positioning elements thereon. The positioning slots collaborate with the positioning elements to prevent the first and the second shafts from falling out of the first and the second through holes of the main body.