管延安是中交港珠澳大桥岛隧工程Ⅴ工区航修队钳工,18岁开始跟着师傅学钳工,20多年勤学苦练,他精通各门钳工工艺。2013年年初,管延安成为岛隧工程建设大军中的一员,他所负责的沉管舾装作业,导向杆和导向托架安装精度要求极高,接缝处间隙误差不得超过正负1毫米。他带领舾装班组同测量人员密切配合,利用千斤顶边安装边调整,从最初要调整五 Guan Yan’an is a fitter and crew repairman working in Area V of Zhuhai-Macao Bridge Project. At the age of 18, he began to follow the master as a fitter. After more than 20 years of hard work and hard training, he was well versed in the workmanship of all fitters. In early 2013, Guan Yanan became a member of the construction work of the Island Tunnel project. He was responsible for immersion and disassembly operations. The precision of the guide bar and guide bracket was extremely high. The gap between the joints should not exceed ± 1 mm. He led the installation team closely with the measuring staff, the use of jack side edge adjustment, from the initial adjustment to five