In the early days, all kinds of poles started from wooden poles, even
including high voltage poles whose voltage level was not too high.
Later, due to the development of steel bar and concrete, combined with
technical research, using the principle of centrifugal force to
manufacture, reinforced concrete conical cement pole, equal diameter
cement wire pole replaced most of the wood pole, cement pole is durable,
corrosion resistant, temperature difference resistant, high strength,
Photo album of pole
And suitable timber is gradually scarce, cement poles have smooth and
beautiful appearance, more convenient to beautify the city, and wood
poles are basically hard to see in the city.
但是在一些不太发达的地方架州苗木 保定通风管道 丝网立柱模具 尼龙输送带 保定空压机 高碑店养老院设电话线还使用木杆，是因为木杆重量轻、架设方便，而且电话线的承重和拉力小，木杆可以胜任，电话线路若有改动，移杆也方便。所以，还有部分木质电话线杆。
But in some less developed areas, wooden poles are also used to erect
telephone lines because they are light in weight and easy to erect, and
the load and tension of telephone lines are small. The wooden poles can
be competent. If the telephone lines are changed, it is also convenient
to move the poles. So there are some wooden telephone poles.