Ring bit Tunnel Forepoling Casing Advance

Forepoling, uga dikenal minangka payung tabung, minangka aplikasi sing digunakake kanggo ngiyataken atap trowongan ing kondisi watu sing rusak.Sistem pengeboran kasusun sakacasingtabung kang dilatih liwat overburden minangka payung lan kapenuhan grouting.Sistem Casing KAT ngidini gampang nyopir tabung casing menyang lemah kanthi panjaluk torsi sing sithik.Ing forepoling modern uga casing fiberglass bisa digunakake kanggo facebolts Ultra-dawa.

Sistem Casing KAT sing biasane digunakake ing forepoling yaiku RoX + 88,9/8, RoX 114,3/10 lan RoX 139,7/10.

Tabung casing

Biasane siji tumpukan kasusun saka sawetara casing baja saka 1,5 - 3 meter

Sambungan kanthi benang

Katup injeksi kanggo grouting

Dhiameter casing standar: 88,9 – 114,3 – 139,7 – 168,3 mm

.Pilot Bits.Majelis Ring.Batang Bor.Casing wiwitan.Extension Casing .Grouting Plug (tutup mburi).Adaptor .Katup Grouting.Sistem Pengeboran Forepoling

Kode sistem	Casing				Ring bit				Pilot bit		Utas
	[mm]	[ing]	[mm]	[ing]	[mm]	[ing]	[mm]	[ing]	[mm]	[ing]
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	6 ¼	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