【摘要】 对城市燃气管道进行带压不停气的维抢修、改造作业时，管道带气封堵是作业中的重要工序。文中介绍了现有燃气管道带气作业的施工流程及盘式封堵、筒式封堵、折叠式封堵、囊式封堵4种常见封堵技术，并从改进现有技术和引进其他目前未应用在城市燃气管道的带气封堵技术两方面对城市燃气管道带气封堵技术的发展进行展望。更多还原

【Abstract】 When carrying out maintenance and renovation operations with pressure on urban gas pipelines, pipeline on-line plugging is an important process in operation. This paper introduced the process of on-line operation of urban gas pipelines and four common plugging techniques including disk-type plugging, barrel-type plugging, foldable plugging and airbag plugging. By improving the existing techniques and the introduction of on-line plugging techniques which has not been applied in urban gas pipeline, the development of on-line plugging technique of urban gas pipelines was prospected.更多还原