300t×123m门式起重机主梁结构制作工艺精度控制

Accuracy control of manufacturing process for main beam of 300t*123m gantry crane

本文主要介绍300t×123m门式起重机主梁制作工艺精度控制的措施和方法,通过合理设置焊接收缩余量、预拱度、制作合拢胎架、采用有续的吊装、焊接顺序、加强过程精度控制等措施,主梁的整体结构尺寸达到设计要求。

this paper mainly introduces the measures and methods to control the fabrication precision of the main girder of 300t x 123m gantry crane.The overall structure size of the main girder meets the design requirements through reasonable setting of welding shrinkage allowance,prearch degree,making of closed tyre frame,adopting continuous lifting,welding sequence and strengthening process precision control.