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Forging Concentric DTH Drill Bit for Big Diameter Construction Anchor Drilling
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Forging Concentric DTH Drill Bit for Big Diameter Construction Anchor Drilling

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Forging Concentric DTH Drill Bit for Big Diameter Construction Anchor Drilling

 

Concentric drilling tools With casing shoe for big diameter construction anchor drilling

 

Introduction

1.Sound drilling straightness and fast drilling speed.

Theoretically, symmetric drilling makes sure the hole in all formations such as gravel bed, stright,the drilling speed fast and the drilling torque relatively small.    

 

2.The torque necessary for symmetric drilling is much less than that for eccentric drilling.     

A smooth and steady drilling may be achieved using ring bit on all conditions and create big holes even if a small drilling rig is used.   

3.Unlocking-relocking can be relatively easily achieved.  

Unlocking the system is sometimes required during the drilling process. Relocking is easy since there are no eccentric components that must be opened or closed inside the hole.

4.Drilling can be carried out at any angle.  

Symmetric drilling can shape the hole at any angle.   

5.Effective cutting discharge.  

The airflow for cuttings discharge purpose during the symmetric drilling will instantly ascend along the casing pipe after spurting out from the pilot bit.Hence, the negligible damage on the wall of hole can guarantee effective cutting discharge.

6.Easy to operate and system security.

Drilling workers are relieved of the need to maintain their continuous and constant attention on drilling process since symmetric drilling can carry on smoothly.

7.Economical and cost effective.  

The structure and principle of operation of symmetric drilling system can guarantee considerable reduction in downtime, fewer consumables and lower operating costs.

Concentric drilling precess

 

 

Specification

A B C D E F G
Outer Dia.of Casing Tube Inner Dia of casing tube Reamed Dia. Min.Inner Dia.of Casing Shoe Hammer Type Drill Pipe Max.Outer Dia.of Normal Bit
mm mm mm mm mm mm
108 93-99 118 86 3'' 76 77
114 101-103 127 91 3'' 76
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Mr. Mr. Jack Cheng
Tel: 86-10-84673566
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Xuanhua Jinke Drilling Machinery Co., Ltd.
Xuanchi Road,Industrial Development Zone,Xuanhua, Beijing, China (Mainland)
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