2022 High quality Blast Hole Drilling Bit - Concentric casing system with blocks – Spark

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2022 High quality Blast Hole Drilling Bit - Concentric casing system with blocks – Spark Detail:

Application

Piling, anchoring, foundation

Component parts

Operation procedure

Step1: When drilling starts, the system drives the casing shoe and casing tube move down.
Step2: When reaching the bedrock, lift up the block system, the blocks will closed, reverse rotation and pull out the block system from the hole.
Step3: If the hole have reach the desired depth, finish the drilling and continue other process.
Step4: If you still want to drill deeper, use the conventional DTH bit to drill to the desired depth.

Advantages

Reliable performance, easy to retrieval

Ralated part list

Specification of concentric casing system with blocks

	D		h	H	C	G
Model	O.D. of Casing Tube (mm)	I. D. of Casing Tube (mm)	Wall thickness of casing (mm)	Guide device max. Dia. (mm)	Reamed Dia. (mm)	Max. dia. of normal bit (mm)	Qty. of blocks	Hammer Type	Weight（KG）
T185	219	199	10	197	234	185	3	COP64/DHD360/SD6/QL60/M60	61
T210	245	225	10	222	260	210	3	COP84/DHD380/SD8/QL80/M80	88
T240	273	253	10	251	305	240	3	COP84/DHD380/SD8/QL80/M80	96.5
T280	325	305	10	302	350	240	3	COP84/DHD380/SD8/QL80/M80	115
T305	355	325	10	322	380	305	3	DHD112/NUMA120/SD12	214
T365	406	382	12	380	432	365	4	DHD112/NUMA120/SD12	254
T432	480	454.6	12.7	450	505	432	4	TK14	415
T460	508	482.6	12.7	479	534	461	4	NUMA180	630
T510	560	534.6	12.7	530	590	510	4	NUMA180	730
T553	610	584.6	12.7	582	639	553	4	NUMA180	895
T596	660	628	16	625	690	596	4	NUMA180	946
T645	711	679	16	675	741	645	4	NUMA180	1010
T694	762	730	16	726	792	694	4	NUMA240	1595
T744	813	781	16	776	845	744	6	NUMA240	2436
T846	914	882	16	878	946	846	6	NUMA240	2756
T948	1016	984	16	980	1050	948	6	NUMA240	3076

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