Large diameter DTH drilling tools

Short Description:

When you want to drill some large diameter hole, but the formation contains gravel, boulders and weathered bedrock, you can use larger diameter DTH hammer and bits to drill. They can drill through hard rocks with high penetration rate, which can save your drilling cost.

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Advantages

1.Using DTH hammer drilling is a good way to drill through cave formation and avoid stuck problem.

2.When encountering caves, drill bit inclines to the cave. You can add a stabilizer to ensure the hole straightness.

Large diameter DTH hammer

We can supply large diameter DTH hammers and bits with different shanks:

12”: DHD112, SD12, NUMA120, NUMA125

14”: NUMA125

18”: NUMA180

24”: NUMA240

12” NUMA120 HAMMER

PRODUCT NAME	NUMA120 HAMMER
BIT SHANK	NUMA120 WITH FOOT VALVE
CONNECTION THREAD	API 6 5/8 REG
MAX. WORKING PRESSURE	30 BAR
AIR CONSUMPTION	70m³/min (18BAR)
RECOMMEND ROTATION SPEED	15-40 r/min
OUTER DIAMETER	275MM
REC HOLE SIZE	305-350MM
LENGTH WITHOUT BIT	1698.5MM
WEIGHT	550KG

ITEM DESCRIPTION
NO	PART LIST
1	TOP SUB (can insert carbides)
2	TOP SUB RING
3	CHECK VALVE
4	SPRING
5	SHOCK RING
6	CHECK VALVE GUIDE
7	AIR DISTRIBUTOR GUIDE
8	PRESSURE BEARING RING
9	AIR DISTRIBUTOR TUBE
10	PISTON
11	OUTER CYLINDER
12	BUSH DRIVE SUB
13	O RING
14	BIT RETAINING RING
15	STEEL RING
16	CHUCK SLEEVE

24” NUMA240 HAMMER

PRODUCT NAME	NUMA240 HAMMER
BIT SHANK	NUMA240 WITH FOOT VALVE
CONNECTION THREAD	HEX
MAX. WORKING PRESSURE	30 BAR
AIR CONSUMPTION	130m³/min (18BAR)
RECOMMEND ROTATION SPEED	15-25 r/min
OUTER DIAMETER	525MM
REC HOLE SIZE	500-1000MM
LENGTH WITHOUT BIT	2543.5MM
WEIGHT	2598KG

ITEM DESCRIPTION
NO	PART LIST
1	TOP SUB (can insert carbides)
2	TOP SUB RING
3	STEEL RING
4	CHECK VALVE
5	SPRING
6	SHOCK RING
7	CHECK VALVE GUIDE
8	O RING
9	AIR DISTRIBUTOR GUIDE
10	PRESSURE BEARING RING
11	O RING
12	AIR DISTRIBUTOR TUBE
13	PISTON
14	OUTER CYLINDER
15	BIT RETAINING RING
16	STEEL RING
17	CHUCK SLEEVE

Large diameter DTH bit

The large diameter bits are mainly used in three applications: embedded prefabrication pile, long spiral pile and large diameter end bearing pile.

The bit face mainly used concave face. The advantage of these face can ensure the straightness of the hole.

Specification

Bit shank	DHD112, SD12, NUMA120
Recommend hole size	305-350mm (standard)
Max. hole size	580mm (oversized)
Bit face	convex, drop center
Material	alloy steel
Button type	spherical, ballistic, semi-ballistic
Button grade	YK05, KD10
Button installation method	cold pressing
Bit shank	Numa180
Recommend hole size	500-650mm (standard)
Max. hole size	770mm (oversized)
Bit face	convex, drop center
Material	alloy steel
Button type	spherical, ballistic, semi-ballistic
Button grade	YK05, KD10
Button installation method	cold pressing
Bit shank	Numa240
Recommend hole size	650-800mm (standard)
Max. hole size	1000mm (oversized)
Bit face	convex, drop center
Material	alloy steel
Button type	spherical, ballistic, semi-ballistic
Button grade	YK05, KD10
Button installation method	cold pressing