Balanced Type Overburden Drilling System
The Gamma DTH hammers are produced from the latest technology and highest quality materials under strict quality control.
When drilling in soft and loose ground with scattered boulders, the soil and clay are caved in. This creates drilling difficulty to withdraw the DTH drilling equipment and lowers the drilling speed. To overcome this problem, MAXA manufactures the "Balanced Type" (BT) Overburden Drill System to enable drilling and lowering the casing simultaneously. This prevents the soil from collapsing into the drilled hole.
The systems are designed to drill the hole diameters bigger than the casing diameter. When reaching the required drilled depth, the DTH hammer and BT Overburden Drill System can be withdrawn from the hole. If the bed-rock level is reached and further drilling is needed, you can simply change the bit to a conventional DTH bit and drill.
We developed the "Balanced Type" (BT) overburden systems for driving casings up to 914.4mm (36") O.D. casings. Each system consists of a guide device, wing bits and locking system. The wing bits expand and retract concentrically so the system can drill a straighter hole. The wing bits are closed by rotating the system in reverse direction to allow withdrawal of the BT system and D.T.H. drill string when reaching required depth. The wing bits can be replaced separately when they are worn out.
|Balanced Type Overburden Drilling System Specifications|
|System Bit Size||No. of Wings||Outer Diameter of Bit (mm)||Applicable Casing (mm)||Hammer Shank|
|Expanded||Retracted||Outer Diameter||Max Wall Thickness|
|BT190||2||237||190||219.1||6.3||DHD360, QL60, SD6, XL6, MACH 60|
|BT215||2||277||218||254||8||DHD380, QL80, SD8, MACH 80|
|BT230||2||300||230||273||12.5||DHD380, DHD380S, QL80, SD8, MACH 80|
|BT235||2||300||235||273||10||DHD380, DHD380S, QL80, SD8, MACH 80|
|BT240||2||300||240||273||8||DHD380, DHD380S, QL80, SD8, MACH 80|
|BT355||3||432||354||406.4||12.5||N120, DHD112, SD12, K270, N125, N120S, SD15, K320|
|BT360||3||432||359||406.4||10||N120, DHD112, SD12, K270, N125, N120S, SD15, K320|
|BT445||3||535||445||508.8||14.2||N180, SD18, K350, K370, K410|
|BT450||3||535||450||508.8||12.5||N180, SD18, K350, K370, K410|
|BT545||3||637||545||610||16||N180, SD18, K350, K370, K410|
|BT548||3||637||548||610||14.2||N180, SD18, K350, K370, K410|
|BT550||3||640||550||610||12.5||N180, SD18, K350, K370, K410|
|BT835||4||953||834||914.4||16||N240, K520, XL240, C330, K610, K700|
|BT838||4||953||838||914.4||14.2||N240, K520, XL240, C330, K610, K700|
|BT840||4||953||841||914.4||14.5||N240, K520, XL240, C330, K610, K700|
Specifications are subject to change without notice.