Factory direct sales 5" 146mm Eccentric drilling casing system with Ring Bit

Product Descrption 
When drilling in soft and loose ground with scattered boulders, the soil and clay are caved in, which creates drilling difficulty to withdraw the DTH drilling equipment and lowers the drilling speed.

To overcome this problem, KINGDRILLING Eccentric Type Overburden Casing Drilling System to enable drilling and lowering the casing simultaneously. This prevents the soil from collapsing into the drilled hole.The systems are designed to drill the hole diameters bigger than the casing diameter. When reaching the required drilled depth, the DTH hammer and Overburden Drill System can be withdrawn from the hole. If the bed-rock level is reached and further drilling is needed, you can simply change the bit to a conventional DTH bit.

 

1. Application range

It is suitable for drilling water wells, geothermal wells, short micropiles, medium mini-type grounting hole of building, dam and harbour project.

2. Outstanding Advantage
Simple structure, easy operation, reliable quality, retrievable drilling tools and long service life.

 

Working principle:

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 carefully, 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 bottom 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. 

Technical Date:

1. High quality: We are the partners with a lot of big factories in China. We can provide the best quality products to you. 
2. Competitive price: Competitive price because of direct factory price. 
3. Fast delivery time:usually it takes 20 days for production.only 3 or 5 days if we have stock of your request size.
4. Best quality control:We have our own experienced QC team,there will be strict inspection and testing for each order before shipping out.
5. Problems solve ability:This ability comes from rich experiences of drill bits industry and reliable sales..
6. OEM,ODM service:your own request about product will be served well.
7. Best after service:We will go to your place to check and solve the problems if you need.

1. Goods in stock can be delivered within 5 days.
2. DTH Bits production time is about 15 days.
3. DTH Hammer product time is about 30 days.