The principle of air DTH hammer is a drilling method to use compressed air as circulatory medium to flush borehole,cool bits,bring cuttings from bottom to surface.

By the construction case of a large diameter water supply well in a water plant of Guangxi,the paper detailed air downhole hammer drilling,hole reaming,borehole wall protection and construction technology in borehole with large diameter and serious water flow in complicated karst formation.

Visual Software System Development on Pneumatic DTH Design;

The Modal Analysis of Pneumatic DTH Short Drillstring;

Laboratory experiment and studying on bidirectional pneumatic DTH hammer

In order to illustrate the application future of virtual prototyping technology in geological engineering machinery,a pneumatic DTH hammer was selected as an example to be simulated and evaluated with the sof.

Differential-volume DTH was presented in the paper,which was totally different to traditional pneumatic DTH hammer with two-side inlet-exhausted structure,the energy efficiency and work efficiency are anticipated 20% higher than DTH hammer.

CJ-130 two-way pneumatic DTH is a new type drilling machine,which has been successfully applied to the construction in the field of anchor engineering.

According to sticking accident in anchorage hole drilling in landslide stratum,a pneumatic DTH was developed with two-way impact.

The development of ZWC-95 mid-pressure air DTH hammer;

Inner Hole Obstruction Mechanism Analysis of DTH hammer;

Research and application on rock broken mechanism of pneumatic DTH hammer spherical tooth