drilling depth, the air consumption of DTH hammer increases, the cost of DTH
hammer drilling increases exponentially, and the drilling efficiency is low. By using
double power head DTH hammer drilling machine, i.e., long screw drilling machine
and pneumatic DTH hammer, rapid drilling can be realized in various soft and hard
loose strata, gravel strata, pebble strata and rock strata under complex geological
conditions, forming rock-socketed piles with large bearing capacity and anti-slide
piles for preventing geological hazards. Its adaptability is strong and construction
efficiency is high, which is 3–10 times higher than that of conventional percussive
rotary drilling. The pore-forming quality is good and there is no mud pollution. This
equipment is the most advanced construction equipment for drilling pile holes in
rock entry and loose strata and has been serialized.
Large diameter DTH hammer with double power head is a drilling technology
combined with double power head drill and large diameter DTH hammer. As shown
in Fig. 11.1, it combines DTH hammer high-energy percussive rotary rock fragmentation drilling and DTH hammer high-frequency rotary percussive drilling. It
has the characteristics of high drilling efficiency, good drilling quality, and strong
adaptability to complex conditions. Figure 11.2 shows an example of the application
of pneumatic DTH hammer in a copper mine disaster in Chile. The underground
Fig. 11.1 Dual power head pneumatic DTH hammer
11.1 Overview
197
hammer drilling increases exponentially, and the drilling efficiency is low. By using
double power head DTH hammer drilling machine, i.e., long screw drilling machine
and pneumatic DTH hammer, rapid drilling can be realized in various soft and hard
loose strata, gravel strata, pebble strata and rock strata under complex geological
conditions, forming rock-socketed piles with large bearing capacity and anti-slide
piles for preventing geological hazards. Its adaptability is strong and construction
efficiency is high, which is 3–10 times higher than that of conventional percussive
rotary drilling. The pore-forming quality is good and there is no mud pollution. This
equipment is the most advanced construction equipment for drilling pile holes in
rock entry and loose strata and has been serialized.
Large diameter DTH hammer with double power head is a drilling technology
combined with double power head drill and large diameter DTH hammer. As shown
in Fig. 11.1, it combines DTH hammer high-energy percussive rotary rock fragmentation drilling and DTH hammer high-frequency rotary percussive drilling. It
has the characteristics of high drilling efficiency, good drilling quality, and strong
adaptability to complex conditions. Figure 11.2 shows an example of the application
of pneumatic DTH hammer in a copper mine disaster in Chile. The underground
Fig. 11.1 Dual power head pneumatic DTH hammer
11.1 Overview
197