Bridge ( door ) cranes

Currently, the crane must be tested by using the register be put into use after passing . During the inspection the bridge ( the door ) cranes , the main beam and the amount of camber main bridge gantry crane beam deflection measurement set is an indispensable element . Main beam camber measurement method , mainly water level measurements , pull wire ( Amendment) Act and laser straight line method measured deflection mainly theodolite , laser range finder , etc. ; due to different inspectors for camber and understanding different deflection , although the same measurement method , measurement point but full of tricks, with mixed results . Not standardized measurement method , camber and deflection values ??measured on the test and determine whether the crane girder qualified meaningless. In order to eot crane measure the value of camber and deflection can truly reflect the bridge ( the door) as an indicator crane girder situation , we must design intent , analyze measurement and evaluation standards . The purpose of the bridge and making the definition of a camber camber and deflection ( door ) crane main beam camber (F) is the main beam prefabricated by the horizontal line , counting the amount of upward arch . Deflection refers to the rated load in the main beam under the car , the elastic deformation of the main beam generated span down counting from the actual position of the front loading .