开采瓦斯煤层保证安全措施之一是加强通风。通风效率在很大程度上取决于管路结构和管间的连接密封件,特别是管路长度超过1 000 m的更加重要。采用直径1 200 mm和1 500 mm通风管和大直径通风管的特性是:大直径软管在自重作用下发生管子下坠,使直径比原来的缩小30%~40%。当通风机 One of the safeguards measures to secure gas coal seams is to enhance ventilation. Ventilation efficiency depends to a large extent on the piping structure and the connecting seals between the pipes, and more importantly the length of the pipes in excess of 1 000 m. Adopting the features of 1 200 mm diameter and 1 500 mm ventilation ducts and large diameter ventilation ducts is that tubes with large diameter drop under their own weight to reduce the diameter by 30% ~ 40%. When the fan