2.When finished the drilling in overburden rock formations, raise the drilling tools and the blocks will get closed through the grooves , and the drilling tools can be pulled out from the hole.
3. Next construction can be followed.
| Model | O.D of casing tube(mm) | I.D ofcasing tube(mm) | Wall thickness(mm) | Guide device max Dia.(mm) | Reamed Dia.(mm) | Max O.D of normal bit(mm) | Blocks qty | Hammer type | Weight(kg) |
| TDS186 | 219 | 199 | 10 | 197 | 234 | 185 | 3 | COP64/DHD360/SD6/QL60/MISSION60 | 61 |
| TDS210 | 245 | 225 | 10 | 222 | 260 | 210 | 3 | JS8/COP84/DHD380/SD8/QL80 | 88 |
| TDS240 | 273 | 253 | 10 | 251 | 305 | 240 | 3 | JS8/COP84/DHD380/SD8/QL80 | 96.5 |
| TDS280 | 325 | 305 | 10 | 302 | 350 | 282 | 3 | JS8/COP84/DHD380/SD8/QL80 | 115 |
| TDS305 | 355 | 325 | 10 | 322 | 380 | 305 | 3 | DHD112/NUMA120 | 214 |
| TDS365 | 406 | 382 | 12 | 380 | 432 | 365 | 4 | DHD112/NUMA120 | 254 |
| TDS432 | 480 | 454.6 | 12.7 | 450 | 505 | 432 | 4 | TK14/NUMA125 | 415 |
| TDS460 | 508 | 482.6 | 12.7 | 479 | 534 | 461 | 4 | NUMA180/TDS18 | 630 |
| TDS510 | 560 | 534.6 | 12.7 | 530 | 590 | 510 | 4 | NUMA180/TDS18 | 730 |
| TDS553 | 610 | 584.6 | 12.7 | 582 | 639 | 553 | 4 | NUMA180/TDS18 | 895 |
| TDS596 | 660 | 628 | 16 | 625 | 690 | 596 | 4 | NUMA180/TDS18 | 946 |
| TDS645 | 711 | 679 | 16 | 675 | 741 | 645 | 4 | NUMA180/TDS18 | 1010 |
| TDS694 | 762 | 730 | 16 | 726 | 792 | 694 | 4 | TDS24/NUMA240 | 1595 |
| TDS744 | 813 | 781 | 16 | 776 | 845 | 744 | 6 | TDS24/NUMA240 | 2436 |
| TDS846 | 914 | 882 | 16 | 878 | 946 | 846 | 6 | TDS24/NUMA240/QL300 | 2756 |
| TDS948 | 1016 | 964 | 16 | 980 | 1050 | 948 | 6 | TDS24/NUMA240/QL300 | 3076 |
