Forepoling, pia inajulikana kama mwavuli wa bomba, ni programu inayotumiwa kuimarisha paa la handaki katika hali ya miamba iliyovunjika.Mfumo wa kuchimba visima ni pamoja nacasingmirija ambayo huchimbwa kupitia mzigo kupita kiasi kama mwavuli na kujazwa na grouting.Mfumo wa Ufungaji wa KAT huruhusu kuendesha kwa urahisi mirija ya kuweka ardhini na mahitaji ya torque ya chini.Katika utabiri wa kisasa pia casings za fiberglass zinaweza kutumika kwa bolts za uso wa muda mrefu zaidi.
Mifumo ya Kasi ya KAT inayotumiwa zaidi katika utangulizi ni RoX+ 88,9/8, RoX 114,3/10 na RoX 139,7/10.
Casing zilizopo
Kawaida rundo moja linajumuisha casings kadhaa za chuma za mita 1,5 - 3
Kuunganishwa kwa thread
Vipu vya sindano kwa grouting
Vipimo vya kawaida vya casing: 88,9 - 114,3 - 139,7 - 168,3 mm
.Pilot Bits.Makusanyiko ya Pete.Vijiti vya kuchimba.Casings Starter.Vifurushi vya Ugani .Plugs za Grouting (kofia za mwisho) .Adapta .Valves za Grouting.Mifumo ya Uchimbaji wa Utangulizi
Kanuni ya mfumo | Casing | Pete kidogo | Pilot kidogo | Uzi |
| | | | |
[mm] | [katika] | [mm] | [katika] | [mm] | [katika] | [mm] | [katika] | [mm] | [katika] |
RoX+ 76,1/4 | 76.1 | 3 | 4 | 0.157 | 52 | 2.047 | 90 | 3.543 | 66 | 2.598 | R32 |
RoX+ 76,1/8 | 76.1 | 3 | 8 | 0.315 | 47 | 1.850 | 90 | 3.543 | 59 | 2.323 | R32 |
RoX+ 88,9/4 | 88.9 | 3 ½ | 4 | 0.157 | 71 | 2.795 | 99 | 3.898 | 80 | 3.150 | T38 |
RoX+ 88,9/8 | 88.9 | 3 ½ | 8 | 0.315 | 50.8 | 2,000 | 94.9 | 3.736 | 70 | 2.756 | T38 |
RoX+ 101,6/10 | 101.6 | 4 | 10 | 0.394 | 65 | 2.559 | 110 | 4.331 | 79 | 3.110 | T38 |
RoX+ 114,3/5 | 114.3 | 4 ½ | 5 | 0.197 | 91 | 3.583 | 128 | 5.039 | 102 | 4.016 | T38 |
RoX 114,3/10 | 114.3 | 4 ½ | 10 | 0.394 | 73.5 | 2.894 | 120.30 | 4.736 | 92.5 | 3.642 | T38 |
RoX 139,7/10 | 139.7 | 5 ½ | 10 | 0.394 | 94 | 3.701 | 145.70 | 5.736 | 117.5 | 4.626 | T45 |
RoX+ 159,0/10 | 159.0 | 6¼ | 10 | 0.394 | 119 | 4.685 | 169.0 | 6.654 | 137 | 5.394 | T45 |
RoX+ 168,3/10 | 168.3 | 6 ⅝ | 10 | 0.394 | 127 | 5,000 | 182.3 | 7.177 | 147 | 5.787 | T45 |
RoX+ 219,1/12,7 | 219.1 | 8 ⅝ | 127 | 0.500 | 167 | 6.575 | 234 | 9.213 | 191 | 7.520 | T45 |
RoX+ GFRP 76,1/8 | 76.1 | 3 | 8 | 0.315 | 47 | 1.850 | 90 | 3.543 | 59 | 2.323 | R32 |
RoX+ GFRP 76,1/8 | 76.1 | 3 | 8 | 0.315 | 47 | 1.850 | 90 | 3.543 | 59 | 2.323 | T35 |
Iliyotangulia: Tophammer Tools Drifter Fimbo mashimo Hexagonal kuchimba viboko Inayofuata: Hex22mm Taper7/11/12 Fimbo ya Kuchimba Miili ya Mwamba yenye Tapeli ya Kuchimba Fimbo yenye Tapered