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Symmetric Casing advancement drilling System

Rock drilling tools manufacturer ROSCHEN , Symmetric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. Application Range: Suitable for drilling water wells, geothermal wells, medium mini-type grouting hole of building, dam and harbor project.

Quantity:
  • 3 1/32 ~30 27/32
  • ROSCHEN
  • ROS-SYM-(NO.)

Product Description

Symmetric Casing advancement drilling System



Rock drilling tools manufacturer ROSCHEN , Symmetric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole.

 

DTH hammer’s impact energy is transferred through the pilot and ring bits, crushing rock, part of impact energy advances casing. On completion of drilling and casing, the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling. The ring bit stays in the hole, and can be recovered only if the casing is retrieved. Drilling continues to the desired depth in the bedrock using a conventional drilling.

Drilling through loose, unconsolidated material such as soil, clay, silt, sand, gravel, and boulders is the so-called overburden, which is often problematic due to the tendency of the earth to cave in behind the drill bit. The Symmetric Casing Drilling System is just to drill in rock formation where contains some such ovals and fractures, and it represents the latest technology in simultaneous overburden casing drilling systems.

symmetric casing advancement system

 Application Range: Suitable for drilling water wells, geothermal wells, medium mini-type grouting hole of building, dam and harbor project.

1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe.

2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock. Part of impact energy advances casing.

3. On completion of drilling and casing, the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling. The ring bit stays in the hole, and can be recovered only if the casing is retrieved.

4. Drilling continues to the desired depth in the bedrock using a conventional drilling.


Casing Tube OD  Ring Bit OD  Min. Casing Shoe ID  Pilot Bit Diameter  Hammer   Shank Style 
mm  inch  mm  inch  mm  inch  mm  inch 
108~127  4 1/4 ~ 5  118~134  4 5/8 ~ 5 1/4  78~101  3 1/16 ~ 4  77~92  3 1/32 ~  DHD3.5, Cop34, Mission 30 
3 5/8
140~146  5 1/2 ~  150 ~156  5 27/64 ~  94~117  3 45/64 ~  105~124  4 1/8 ~  DHD340A, SD4, QL40, Mission40 
5 3/4 6 1/8 4 5/8 4 57/64
168~178  6 5/8 ~ 7  178~195  7 ~ 7 5/8  121~150  4 3/4 ~ 5 7/8  125~156  4 59/64 ~  DHD350R, SD5, QL50, Mission50 
6  9/64 
194~219  7 5/8 ~  203~234  8 ~ 9 1/4  148~190  5 5/8 ~  150~203  5 7/8 ~ 8  DHD360, SD6, QL60, Mission60 
8 5/8 7 1/2
219~325  8 5/8 ~  235~348  9 1/4 ~  190~284  7 1/2 ~  165~306  6 1/2 ~  DHD380, QL80, SD8, Mission 80 
12 3/4 13 11/16 11  3/16  12  3/64 
244~406  9 5/8 ~16  273~440  10 3/4 ~  210~364  8 1/4 ~  190~340  7 1/2 ~  SD10, Numa100 
17  5/16  14  5/16  13 25/64
406~558  16 ~ 22  419~590  16 1/2 ~  328~514  12 27/32 ~  340~440  13 25/64 ~  SD12, DHD112, Numa120, Numa125 
23 1/4 20 1/4 17 3/8
508~762  20 ~ 30  526 ~798  20 45/64 ~  412~716  16 1/4 ~  470~685  18 1/2 ~  SUP205 
31  7/16  28  3/16  26 31/32
609~762  24 ~ 30  637~798  25 ~  513~716  20 3/16 ~  540~685  21 1/4 ~  SUP245 
31  7/16  28  3/16  26 31/32
863 34 900 35  7/16  815 32  3/32  785 30 27/32 SUP325 


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