Medium Size Mini Grouting Hole Concentric Drill Bit for Water Well Drilling Projects

• After-sales Service: Provide
• Warranty: 1 Year
• Certification: CE, ISO 9001:2000, ISO 9001:2008
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Manufacturing Process: Casting
• Material: Tungsten Steel
• Outer Dia. of Casing Tube: 108mm
• Inner Dia. of Casing Tube: 93-99mm
• Reamed Dia.: 118mm
• Transport Package: Standard Exporting Package
• Specification: for water well drilling projects
• Trademark: Rancheng
• Origin: China
• Production Capacity: 100

Product Description

Product Description

Concentric bit for DTH water drilling projects

The Symmetric/Concentric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes give a good seal to the button of the drilling hole and thus minimizing the disruption of the surrounding of the drill hole. 

 

Application Range: the concentric bit is suitable for drilling water wells, geothermal wells, short miscopies, medium mini-type grouting holes of buildings, dams, and harbor projects. 
1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into the pilot bit with a hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe. 
2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock. Part of impact energy advances casing. 
3. On completion of drilling and casing, the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling. The ring bit stays in the hole and can be recovered only if the casing is retrieved 
4. Drilling continues to the desired depth in the bedrock using conventional drilling.

Product Parameters

Outer Dia. of Casing Tube	Inner Dia. of Casing Tube	Reamed Dia.	Min. Inner Dia. of Casing Shoe	Drill Pipes	Max. Outer Dia. of Normal Bit
mm	Mm	mm	mm	mm	mm
108	93-99	118	86	76	77
114	101-103	127	91	76	82
127	114-116	136	101	76	92
140	124-127	152	117	76	105
146	127-132	154	117	76	105
168	149-155	184	140	76,89	125
178	159-165	194	150	76,89	140
193	173-180	206	164	89,114	150
219	199-206	234	184	89,114	165
244	224-231	260	210	114	190
273	251-257	305	240	114,127	220
323	301-310	348	284	127	255
406	382-388	440	364	140	340
457	433-439	488	413	140	385
508	484-490	538	464	140	440

Packaging & Shipping

Delivery Time :10-15days 

After Sales Service

1,24/7 service by chat online and phone.

2,Lifelong and free technical support.
3,Service overseas: if you need, we can dispatch an engineer to your door.

Company Profile

Henan Rancheng Machinery Co.,LTD is one professional supplier drilling rigs in China ,we

are dedicated in designing and manufacture water well drilling rigs ,rotary drilling rig ,anchor drilling rig ,DTH drilling rig ,solar pile driver,mud pump ,air compressor and drilling tools etc,we have advanced technology ,Modern equipment, first-class team and rich experience ,our products passed ISO9001 ,CE etc certificated ,they are exported to around 200 countries and areas in the world ,get very good feedbacks from our clients.

We pursue the principle of "Customer First, Integrity First", we are sincerely expecting to cooperate with you!!!

 

FAQ

1.Why choose us ?

 Rancheng Machinery is a very professional drilling rig supplier in China. We have rich experience in this industry for 11 years.Now our products are serving around the world.we have High Quality, Competitive Price, and Fast Shipment.

 

2.Do you offer any custom designs?

Yes,we have our own trade factory. We provide services to top range partners.Produce a superior product for you by your designs.

 

3,How to make sure the quality we sent to you is same with what we said?

We are the Golded supplier on Alibaba, order through the alibaba trade assurance, will ganrantee the safe of your money and the quality of the goods.

 

4.How To Order ?

Step 1, please tell us what model and quantity you need;

Step 2, then we will make a PI for you to confirm the order details;

Step 3, when we confirmed everything, can arrange the payment;

Step 4, finally we deliver the goods within the stipulated time.

 

5. When will make delivery ?

About 10-15 work days after receipt of the payment.

 

6.After-sales Service

1 year warranty for all kinds of products;

If you find any defective accessories first time, we will give you the new parts for free to replace in the next order, as an experienced manufacturer, you can rest assured of the quality and after-sales service.

 

7,whether we can visit your factory

Yes ,you are warmly welcome to visit us .