MAXDRILL ROCK TOOLS CO.,LTD

Concentric Casing System With Ring Bits

Application Range

Applied to overburden formations with complex topographic and geological conditions, such as gravel, fissured formation, boulder, landfill of construction refuse, etc.

Drills at any angle;

Good straightness of borehole;

Maximum depth of borehole can reach 150 meters.

Structural Advantages

♦ Straightness: ensures the straightness of borehole in different topographic and geological conditions.

♦ Adaptability: ensures penetration efficiency in complex topographic and geological conditions, such as gravel and landfill of construction refuse.

♦ Lower torque: the system torque is less than eccentric casing system.

♦ Easy to unlock an re-rock: easy to re-rock after unlock.

♦ Drilling at any angle: concentric casing system can drill under horizontal, vertical and inclined conditions.

♦ Environmental: better than eccentric casing system, because of its advantages of drilling smoothly, small vibration and low noise, it is more suitable for construction in urban areas.

Component Parts

Casing Shoe	Ring Bit	Pilot Bit

Used to connect the casing tube.	Used to connect the pilot bit and casing shoe.	The major structure of concentric casing system, with buttons and flushing grooves, etc.

Related Parts List


NO	Items	Description
1	Casing Tube	a. Threaded casing tubejeft turning thread b. Welded casing tube
2	Drill rod	Thread: API(REG/IF)/NC
3	Stabilizer	Thread of stabilizer is in keeping with drilling pipe
4	Hammer	Thread: API REG
5	Concentric Overburden Drilling System	Regard the specification forms as below

Concentric Casing System With Rings(retrievable)


	D		h	H	C	G
Part No.	O.D of Casing Tube (mm)	I.D of Casing Tube (mm)	Wall thickness of Casing Tube (mm)	Max. O.D of Pilot Bit (mm)	Reamer Dia.(mm)	Max. O.D of Normal Bit (mm)	DTH Hammer /TOP Hammer Type	Weight(Kg)
Top Hammer Type
MDC76/7RR-01	76	62	7	57	84	39	R32	3.2
MDC89/8RR-01	89	73	858	70	96	58	T38	5.8
MDC114/10RR-01	114	94	10	92	122	80	T45	7.5
MDC127/10RR-01	127	107	10	105	136	90	T45	10
MDC140/10RR-01	140	120	10	116	148	97	T45/T51	15
DTH Hammer Type
MDC114/10RR-02	114	94	10	92	122	80	COP34/DHD3.5	10
MDC127/10RR-02	127	107	10	105	136	90	COP34/DHD3.5	16
MDC140/10RR-02	140	120	10	116	148	97	COP44/DHD340 /SD4/QL40	21
MDC146/10RR-02	146	126	10	124	154	110	COP44/DHD340 /SD4/QL40	22
MDC168/12.7RR-02	168	142.6	12.7	141	180	125	COP54/DHD350 /SD5/QL50/M50	27
MDC178/12.7RR-02	178	152.6	12.7	150	186	135	COP54/DHD350 /SD5/QL50/M50	32.5
MDC194/12.7RR-02	194	168.6	12.7	166	202	145	COP64/DHD360 /SD6/QL60/M60	42.5
MDC219/12.7RR-02	219	193.6	12.7	191	228	170	COP64/DHD360 /SD6/QL60/M60	58
MDC245/12.7RR-02	245	219.6	12.7	214	254	195	COP84/DHD380 /SD8/QL80	78
MDC254/12.7RR-02	254	228.6	12.7	224	265	203	COP84/DHD380 /SD8/QL80	84.5
MDC273/12.7RR-02	273	247.6	12.7	241	286	223	COP84/DHD380 /SD8/QL80	100
MDC325/12.7RR-02	325	299.6	12.7	292	338	276	COP84/DHD380 /SD8/QL80	135
MDC406/12.7RR-02	406	380.6	12.7	377	420	350	QL120/DHD112/ SD12/NUMA120	280
MDC508/12.7RR-02	508	482.6	12.7	478	522	416	QL200/SD18/ NUMA180	522
MDC560/12.7RR-02	560	534.6	12.7	528	575	475	QL200/SD18/ NUMA180	620
MDC610/12.7RR-02	610	584.6	12.7	558	620	513	QL200/SD18/ NUMA180	710
For more info, Please download the catalog