1: When drilling starts,the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.
2:When the required depth is reached, rotation is reversed caerfully,whereupon the reamer swings in, allowing the drill bit assembly to be pulled up through the casing.
3:Casing tubes that are to be left in the drill hole should be sealed at the botton of the hole by means of cement grout or some other sealing agent.
4:Drilling continues to the desired depth in the bedrock using a conventional drilling.
The Max.Wall Thickness
Inner Dia.of Casing Shoe That Pilot Bit Can Pass Through
Inner Dia.of Casing shoe
Drill Pipe (mm)
Product Details Show
Why Choose Us
.WORLDRILL® DTH drilling tools including DTH hammers and bits are widely used in a variety of application formations in more than 50 countries in the world.
Equipment & technology
Our hammer and bits are made of high quality alloy steel with advanced heat treatment to assure the good drilling performance and long service life. They are widely used by our customers all over the world.
" I am so impressive with WORLDRILL and thanks for their good service and understanding " --- Alexander from South Africa " I have found the best provider" --- From an Indian Partner
Q1: Can I have a sample for testing? A:Samples are still to be paid but discounted price can be provided.
Q2: Do you have the inspection procedures? A:100% strict inspection and testing for every order before packing.
Q3: How can i get the after sale services? A:Free replacement will provide once the problems casued by our product quality.
Q4: Can I have a visit to your factory before the order? A: Sure, welcome.