In order to prevent foreign drilling machine in construction of pile damage, fill the outer ring excavation construction path above existing ground 500mm-800mm, compacting and laying steel plate
To prevent the digging machine in the construction of the outer ring of the pile damage in the outer path construction excavator fill above the existing ground 500mm-800mm, laying and compaction plate
In order to prevent digging machine in the construction on the outer ring of the pile damage, in the outer ring of the excavator construction path fill above the existing ground 500mm-800mm and compaction of and laying steel