Underground has a material quality in the searching range is the Ductile iron tube, caliber 100mm, is the slush pump outlet pipe, from the human well 1 to the human well 2, the way xxx and the harbor police entrance, this Duan Guan both sides all has the corner. Under the human well in 2, the curved orifice faces, in the human well 1, the tube has not opened the mouth. Therefore, regarding this Duan Guan the clean and survey suggest as follows:
1. in the sand well in 1, will get involved in a mouth, is advantageous for the equipment to enter;
2. in the sand well in 2, dismounts the bend, is advantageous for the equipment to enter.
In addition, even if has done above work, cannot guarantee this section of tubes can clean and survey completely, this is because this tube has the corner and the length of pipe too is long.