Rotary drilling rig roller bit drilling rock-socketed pile construction method sharing _ construction
Original Title: Construction Method Sharing of Rotary Drilling Rig Roller Bit Drilling Rock-socketed Pile I. Characteristics of construction method 1. The machines and tools used in the construction method are compared with the original steel shot The machines and tools required for alloy drilling are basically the same, except that the rock breaking tool, the drill bit, is replaced and a...
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