With the rapid development of my country's iron and steel industry, the welded pipe industry using steel strip products as raw materials has also developed rapidly. The substantial increase in the output of welded pipes in my country is based on the rapid increase in the number of welded pipe units.

Before installing the steel pipe, the trench needs to be dug, and the soil dug after the trench has a reasonable stacking place, the excavated earth should be transported to the outside in time, and should not be too close to the trench, there must be two The distance above the meter, so as not to a