Grid structure chord unloader and unloading method

Abstract

The invention discloses a device and a method for unloading chord members of grid structures. The device comprises a dowel bar and two groups of fixing apparatuses. The two groups of fixing apparatuses are connected with two ends of the dowel bar, each group of fixing apparatuses comprises two abutting plates which are connected with each other, a connecting plate is arranged at one end of each abutting plate and is perpendicularly connected with the abutting plate, a first connecting hole is formed in each connecting plate, an arc-shaped groove is formed in the middle of each abutting plate along the axial direction of the dowel bar, the arc-shaped grooves of the two abutting plates are matched with each other and are matched with the outer surfaces of non-unload chord members, and the dowel bar is connected with the fixing apparatuses at the two ends of the dowel bar by the first connecting holes. The device and the method have the advantages that the structure is simple, the reliability is high, scaffolds to be used as fulcrums are omitted, the device is convenient to assemble and disassemble, the labor intensity is reduced, time and labor can be saved, an economical benefit is high, force can be easily and conveniently unloaded via the device, a good unloading effect can be realized, and the device and the method are particularly suitable for constructing large-span high grid structures.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a grid structure chord unloader and an unloading method. Background technique [0002] Welding, repairing, enlarging cross-section reinforcement, etc. of the chords of the grid structure need to unload the repaired rods to keep the rods in a completely relaxed state without stress. In order to avoid the thermal expansion and contraction of the grid chords caused by welding, which will lead to the unbalanced force of the grid structure, the current unloading methods mainly include scaffolding support unloading method, jack support method or process-assisted method of small-distance welding and long-term stop. The above methods are time-consuming, labor-intensive and expensive. For example, when unloading the network frame in the prior art, external fulcrums are required for unloading the chord members, so a large number of scaffolds need to be erected, which has a ...

AI Technical Summary

Problems solved by technology

The above methods are time-consuming, labor-intensive and expensive

For example, when unloading the grid frame in the prior art, external fulcrums are required for unloading the chord members, so a large number of scaffolds need to be erected, with heavy workload, high cost and poor effect

At the same time, due to the constraints of on-site construction conditions, scaffolding cannot be erected normally in some places, and support points cannot be provided, and normal unloading is impossible, which increases the difficulty of work.

This tool has the characteristics of convenient disassembly, simple use and easy operation. There is no similar unloading tool in the prior art

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