Girder downwarping repairing method for beam crane and beam type crane

Abstract

The present invention relates to beam crane, and is especially one kind of self-repaired pre-stressed beam crane and the method of applying external pre-stress to repair the downwards bent beam of beam crane. The method of the present invention includes the following steps: 1. fixing stretching bearing and fixed bearing separately on two ends below the lower cover of the crane beam; 2. stringing steel strands separately in the fixing anchor beside the fixed bearing and the stretching anchor beside the stretching bearing to anchor the fixed end and to pressing the stretching anchor to the outer side of the stretching bearing; 3. regulating the initial stress of each steel strand with jack for equalized stress; 4. fixing 1-4 staying devices on the lower cover of the crane beam and setting the steel strands; and 5. stretching the steel strand of the stretching anchor with jack for the beam to bend upwards, anchoring the stretching end and regulating the staying devices for proper stress.

Description

technical field [0001] The invention relates to a method for repairing the deflection of the main girder of a beam crane and the girder crane thereof, in particular to a method for repairing the deflection of the main girder of the girder crane by applying prestress outside the body and the prestressed self-repairing girder crane. Background technique [0002] Beam cranes are widely used in industrial and mining enterprises, and have a large social stock. In order to prevent the "climbing" and "rolling" of the trolley due to the working load when the beam crane is in use, GB / T14405-93 "General Bridge Cranes" stipulates that the main beam should have an upper camber, but the beam crane After a period of use, due to various reasons, the camber of the main girder gradually decreases, or even deflects, which affects the use performance and safety performance of the crane, and makes the crane lose its use value. Since the crane is a large-scale equipment, if it is scrapped and re...

AI Technical Summary

Problems solved by technology

In order to prevent the "climbing" and "rolling" of the trolley due to the working load when the beam crane is in use, GB / T14405-93 "General Bridge Cranes" stipulates that the main beam should have an upper camber, but the beam crane After a period of use, due to various reasons, the camber of the main girder gradually decreases, or even deflects, which affects the use performance and safety performance of the crane, and makes the crane lose its use value. Since the crane is a large-scale equipment, if it is scrapped and replaced, it will lose Therefore, it is very important to repair the deflection of the main girder of the crane

Chinese patent CN1069952A discloses a method for repairing and transforming the main girder of a crane by using a "prestressed tensioner", but the tensioner used in this method has the disadvantages of complex structure, large parts, difficult manufacture, and high cost

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