Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 / The New York Tunnel Extension of the Pennsylvania Railroad. / The North River Tunnels. Paper No. 1155

by Bertram Henry Majendie Hewett; W. L. Brown

TABLE 27.— Shield-Driven Tunnel Work, Weehawken Shaft, River Tunnel South. Table showing the size of the gang, the amount of excavation, and the time per ring taken for the various operations involved in building tunnel through the several kinds of ground encountered; also the extent and nature of all the unavoidable delays.

Weight of iron.	Section between rings.	Description.				Ave. No. of Men in Gang.					Av. No. of cu. yd. per ring.	Time Mucking, per cu. yd.	Av. Time per ring Shoving and Mucking.	Time for Jacks.	Time for Ring Erection, Hrs. and Min.					Bolting Time, (Whole Time on Bolts After Ring is Complete.)					Time lost repairing hydraulic piping.	Total Time.
		Length in feet.	Material.	Ave. air Pressure.	Method of Excavation.	Shield.	Drilling.	Grouting.	Air trans.	Total.					Straight.	Bore 1.	Bore 2.	Taper.	Mean.	Straight.	Bore 1.	Bore 2.	Taper.	Mean.		Straight.	Bore 1.	Bore 2.	Taper.	Mean.
						A	B	C	D		E			F	G	G	G	G	G	H	H	H	H	H
Ordinary.	1-27	67.5	Rock	9	[B]	Excavation partially completed previously.									8-30			3-45	8-08	Bolting time for light iron is included in erection.					0-14	21-11			16-26	20-49
	28-42	37.5	"	12	[B]	13	4	1	1	19	48.7	0-25	20-33		4-23			4-00	4-21						0-12	25-08			24-45	25-06
	43-58	40.0	Rock or gravel	12	[B]	19	2	2	2	25	44.2	0-46	33-44		4-16			5-45	4-44						1-15	39-15			40-44	39-43
	59-153	237.5	Gravel and sand	16	[B]Breasting	25		1	4	30	39.0	0-12	8-06		2-19			4-18	2-23						0-30	10-55			12-54	10-59
	154-170	42.5	Sand and silt with piles	18	"	26		1	5	32	41.6	0-10	7-10		2-00	J.	J.	1-48	1-59						0-00	9-10	J.	J.	8-58	9-09
	171-236	165.0	Silt with piles	22	Top half	22		1	3	26	42.6	0-10	7-23		2-36	2-55	2-58	1-24	2-35						0-05	10-04	10-23	10-26	8-52	10-03
	237-259	57.5	Silt	25	[C]1 door	18		1	3	22	13.8	0-11	2-29		3-01	2-05	1-28	2-00	2-32						0-20	5-50	4-54	4-17	4-49	5-21
	260-302	107.5	"	27	[C]1 door	15			2	17	0		0-32		2-34	2-35	3-38	4-28	3-05						0-08	3-14	3-15	4-18	5-08	3-45
	303-350	120.0	"	27	[C]8 doors	15			4	19	6.9	0-07	0-52		2-59	2-28	2-37	1-44	2-41						0-07	3-58	3-27	3-36	2-43	3-40
	351-378	70.0	"	27.5	[C]8 "	18			6	24	0		0-33		2-05	2-32	2-48	2-00	2-18						0-17	2-55	3-22	3-38	2-50	3-08
	379-424	115.0	"	27.5	[C]8 "	19			4	23	6.9	0-07	0-48		3-34	2-51	3-18	3-19	3-22						0-25	4-47	4-09	4-31	4-32	4-35
	425-522	245.0	"	28	[C]1 door	19			4	23	6.7	0-06	0-45		3-09	3-51	3-00	3-28	3-16						0-16	4-10	4-52	4-01	4-29	4-17
	523-625	257.5	"	28	[C]1 "	20			4	24	0		0-32		1-36	1-37	1-47	1-51	1-39						0-12	2-20	2-21	2-31	2-35	2-23
	171-625	1,137.5		27		19			4	23	9.7	0-11	1-44	[Z]	2-37	2-41	2-41	2-32	2-38						0-13	4-34	4-38	4-38	4-29	4-35
	28-625	1,495.0		25		19	.8	0.8	3.4	24	17.8	0-14	4-14	[Z]					2-41						0-16					7-11
Heavy.	626-649	57.5	Silt	28	[C]1 door	16			3	19	12.2	0-12	2-23	[Z]	2-19	2-30	2-05	1-42	2-16	1-01	1-04	1-04	0-50	1-01	0-32	6-15	6-29	6-04	5-27	6-12
	650-733	210.0	"	28	[C]8 doors	19			4	23	13.5		0-57	0-13	1-42	1-24	1-47	1-48	1-39	1-15	0-52	0-55	0-42	1-07	0-32	4-39	3-58	4-24	4-12	4-28
	734-753	50.0	"	28	[C]8 "	24			5	29	8.3	0-05	0-41	0-17	1-06	1-55	0-38	1-20	1-12	0-38	0-44	1-13	0-20	0-44	0-06	2-48	3-43	2-55	2-44	3-00
	754-844	227.5	"	28	[C]8 "	26			8	34	12.8	0-04	0-51	0-16	1-19	1-41	1-52	0-50	1-29	0-39	0-50	0-54	0-40	0-44	0-25	3-30	4-08	4-18	3-02	3-45
	845-859	37.5	"	28	[C]8 "	27			9	36	5.6	0-07	0-39	0-19	1-24	1-08	1-10		1-20	0-45	0-15	0-15		0-37	0-48	3-55	3-09	3-11		3-43
	860-899	100.0	"	28	[C]8 "	24			8	33	16.5	0-02	0-39	0-13	1-00	1-05	1-13		1-04	0-59	0-32	0-49		0-52	0-07	2-58	2-36	3-01		2-55
	900-935	90.0	"	28	[C]1 door	25			7	32	11.5	0-03	0-29	0-14	0-47	1-13	0-52	1-10	0-52	0-39	0-43	0-32	0-20	0-38	0-04	2-18	2-43	2-11	2-17	2-17
	936-963	70.5	"	28	[C]1 "	25			8	33	5.9	0-03	0-19	0-15	0-59	0-47	0-55		0-56	0-34	0-16	0-41		0-32	0-37	2-44	2-14	2-47		2-39
	964-1,003	100.0	"	28	[C]1 "	25			10	35	8.1	0-03	0-27	0-10	0-51	0-52	1-05		0-53	0-32	0-45	0-37		0-35	0-16	2-16	2-30	2-35		2-21
	1,004-1,060	142.5	"	28	[C]1 "	26			10	36	8.7	0-03	0-30	0-15	1-01	1-09	1-05	0-45	1-03	0-54	0-37	0-49	0-40	0-49	0-24	3-04	2-55	3-03	2-34	3-01
	1,061-1,110	125.0	"	28	[C]1 "	37			10	47	6.2	0-03	0-19	0-10	0-42	0-49	0-54	0-45	0-45	0-24	0-26	0-39	0-25	0-27	0-00	1-35	1-44	2-02	1-39	1-41
	1,111-1,238	320.0	"	28	[C]1 "	30			9	39	15.6	0-02	0-38	0-16	0-48	1-06	1-04	1-23	0-56	0-36	0-34	0-57	1-12	0-41	0-02	2-20	2-36	2-57	3-31	2-33
	1,239-1,312	185.0	"	28		39			9	38	13.0	0-03	0-36	0-18	1-04	1-01	1-02	1-15	1-07	0-39	0-43	1-12	0-59	0-50	0-10	2-47	2-48	3-18	3-18	3-01
	626-1,312	1,717.5	"	28		35			8	33	10.6	0-04	0-42	0-14	1-06	1-15	1-16	1-18	1-10	0-45	0-40	0-52	0-54	0-47	0-16	3-03	3-07	3-20	3-24	3-09
All	171-1,312	2,855.0		28		23			6	29	10.2	0-07	1-15	[ [Z]	2-09	2-13	2-21	2-20	2-13	[A]					0-15	3-39	3-43	3-51	3-50	3-43
	28-1,312	3,212.5		26		21			5	26	14.1	0-10	2-28	[Z]					2-18	[A]					0-15					5-01

SUMMARY

Weight of iron.	Section between rings.	Description.				Ave. No. of Men in Gang.					Average No. of cubic yards per ring.	Time mucking, per cubic yard.	Average Time per Ring.				Unavoidable Delays (not Included in Average Time per Ring).
		Length in feet.	Material.	Ave. air Pressure.	Method of Excavation.	Shield.	Drilling.	Grouting.	Air Trans.	Total.			Shoving and mucking. [Z]	Erection.[A]	Lost time.	Total.	Items.	Time, hrs. min.
Ordinary.	28-42	37.5	Rock	12	[B]Breast	13	4	1	1	19	48.7	0-25	20-33	4-21	0-12	25-06	First bulkhead	80-00
	43-58	40.0	Rock and gravel	12	"	19	2	2	2	25	44.2	0-46	33-44	4-44	1-15	39-43	Second bulkhead	156-00
	59-153	237.5	Gravel and sand	16	"	25		1	4	30	39.0	0-12	8-06	2-23	0-30	10-59	Grouting rock sections	280-00
	154-170	42.5	Sand or silt, with piles	18	"	26		1	5	32	41.6	0-10	7-10	1-59	0-0	9-09	Blow-outs	222-00
	171-236	165.0	Silt with piles	22	"	22		1	3	26	42.6	0-10	7-23	2-35	0-05	10-03	Shield repairs	326-40
	237-259	57.5	Silt	25	[C]1 door	18		1	3	22	13.8	0-11	2-29	2-32	0-20	5-21	Horz. timbers	69-30
	260-625	915.0	"	27	1 "	18			4	22	3.6	0-06	0-40	2-39	0-14	3-33	Total	1,134-10
	28-625	1,495.0		25		19	.8	0.8	3.4	24	17.8	0-14	4-14	2-41	0-16	7-11	Per ring	0-53
Heavy.	626-1,312	1,717.5	Silt	28		25			8	33	10.6	0-4	0-56	1-57	0-16	3-09
All.	28-1,312	3,212.5		26		21			5	26	14.1	0-10	2-28	2-18	0-15	5-01

[Z] Including time for jacks.

[A] Including bolting time.

[B] Excavating ahead of shield.

[C] Shoving shield into silt with ... doors open.