按以往施工方法,从地下敷设 PVC 管穿电线是用引入丝把电线拽过来,这种方法费时、费力、进度慢,遇到管路接头往往无能为力。1999年我们在某公园整修中,路灯改造为重头戏,新设路灯灯距为20 m,采用一种新方法:在普通施工线端头绑上一棉花球,球径视 PVC 管径的大小而定,一般球径为管径的三分之二;把绑好的球放进管中,然后用鼓风机(也可用空压机)套上自 According to the past construction methods, laying PVC pipes through the underground is to pull wires through the wire. This method is time-consuming, laborious, and slow. It is often incapable of meeting pipe joints. In 1999, during the refurbishment of a park, street lights were transformed into highlights. The new street lights were set at a distance of 20 m. A new method was adopted: a cotton ball was tied at the end of an ordinary construction line. The diameter of the ball was determined by the size of the PVC pipe. The ball diameter is generally two-thirds of the pipe diameter; put the tied ball into the pipe, and then put it on with a blower (also available as an air compressor).