[Technical Dry Goods] Down-the-hole Drilling and Casing Drilling Technology (I)
Original Title [Technical Dry Goods] Down-the-Hole dth rock bit Drilling and Casing Drilling Technology (I) 1 Overview Air Dth hammer simultaneous casing drilling technology is a new drilling technology which uses compressed air as power and the simultaneous casing drilling tool carries out percussive rotary drilling under the action of air Dth hammer and drill torque and realizes synchronous follow-up of casingAfter the hole is finished the simultaneous casing drilling tool is lifted out of the casing and the casing is used to protect the wall 1 Overview Air Dth hammer simultaneous casing drilling technology is a new drilling technology which uses compressed air as power and the simultaneous casing drilling tool carries out percussive rotary drilling under the action of air bra tape measure Dth hammer and drill torque and realizes synchronous follow-up of casingAfter the hole is finished the simultaneous casing drilling tool is lifted out of the casing and the casing is used to protect the wall 11 Characteristics of air down-the-hole hammer drilling with casing It is mainly used for the broken stratum where it is difficult to form a hole such as gravel layer quicksand layer overburden deluvium etc; the drilling speed is fast and the efficiency is high generally up to 5m/H; dry (air) drilling is of great significance to the construction of water-deficient areas and landslides where water cannot be used; the casing can be recovered and reused; fastest dth hammer The hole depth of single-stage simultaneous casing drilling is generally 40m and some can reach more than 80m; When the mud content in the formation is very high it is easy to block the pores;
The drilling rig requires low speed (less than 50 rpm) and large torque preferably a long-stroke multi-function drilling rig water well drilling rig etc If the geological drilling rig needs to be able to reduce the speed 12 Application field of air down-the-hole hammer drilling with casing Geological exploration Land Disaster Control and Emergency Rescue (Chongqing Wulong Landslide Rescue Project) Water well drilling (Yunnan drought-resistant well drilling project Shandong drought-resistant well drilling project) Hydropower Station Construction (High Slope Emergency Project of Xiaowan Hydropower Station in Yunnan) Foundation Treatment of Urban High-rise Building Expressway and railway construction project Construction of tunnel pipe shed Petroleum geophysical drilling etc Expand the full text GK-4 hole rock core (local) GK-4 hole rock core (local) 2 Working principle of air Dth hammer drilling with casing Structure type of drilling tool with casing Air Dth hammer drilling tool with casing is the most important tool for drilling with casing At present there are many structural types at home and abroad mainly including eccentric mining dth bit concentric centering There are four types of coring and casing drilling tools with different structures and different working principles 2 Working principle of air Dth hammer drilling with casing Structure type of drilling tool with casing Air Dth hammer drilling tool with casing is the most important tool for drilling with casing At present there are many structural types at home and abroad mainly including eccentric concentric centering
