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

[P] Excavating ahead of shield.

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

TABLE 25.— Shield-Driven Tunnel Work, Manhattan 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				Average 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					Ordinary	Bore 1	Bore 2	Taper	Mean	Ordinary	Bore 1	Bore 2	Taper	Mean		Ordinary	Bore 1	Bore 2	Taper	Mean
						A	B	C	D		E			F	G	G	G	G	G	H	H	H	H	H
Ordinary	1-68	170.0	Rock	0	[R]	20	5	5	2	32	41	0-14	9-53	Time for jacks for light iron is included in shoving and mucking	5-27			4-32	5-07	Excavation partially completed previously. Bolting time for light iron is included in erection.						15-20			14-25	15-00
	69-95	67.5	Rock and earth	13	[R]	22	8		2	32	41	0-24	16-18		3-02			2-40	3-00							19-20			18-58	19-18
	96-141	115.0	Rock	10	[R]	21	13		2	36	70	0-16	18-16		2-08			2-27	2-09						0-03	20-27			20-46	20-28
	142-191	125.0	Rock and earth	15	[R]	24	7		2	33	52	0-20	17-27		2-08	J	J	2-04	2-08						0-12	19-47			19-43	19-47
	192-203	30.0	Silt	18	[R]Breasting	23			3	26	36	0-13	7-58		2-27	6-00	2-10	3-15	2-47						1-20	11-45	15-18	11-28	12-33	12-05
	204-388	462.5	"	18	[S]7 doors	27			3	30	37	0-05	3-19		2-41	2-49	2-54	2-56	2-47						0-05	6-05	6-13	6-18	6-20	6-11
	389-429	102.5	Silt, piles and rip-rap.	22	[S] ]6 doors [ [R]Breasting	24			4	28	40	0-17	12-42		3-15	2-36	5-03	3-26	3-27						0-38	16-35	15-56	18-23	16-46	16-47
	430-504	187.5	Silt	21	[S]3 doors	23			5	28	20	0-06	1-51		2-53	3-17	3-00	2-57	2-59						0-39	5-23	5-47	5-30	6-27	5-29
	505-629	312.5	"	22	[ [S]4 doors	25			6	31	27	0-05	2-20		2-23	2-40	2-45	2-28	2-30						0-23	5-06	5-23	5-28	5-11	5-13
	630-692	157.5	"	23	[ [S]2 doors.	24			8	32	22	0-05	1-53		1-54	2-10	2-22	2-23	2-02						0-08	3-55	4-11	4-23	4-24	4-03
	204-692	1,222.5		21		25			5	30	30	0-07	3-27	[T]	2-34	2-45	2-58	2-35	2-42						0-18	6-19	6-30	6-43	6-20	6-27
	69-692	1,560.0		17		23	4	0	3	30	36	0-11	6-40	[T]	2-47			3-18	2-52						0-15	9-42			10-13	9-47
Heavy	693-766	185.0	Silt	24	[S]2 doors	21			6	27	22	0-05	1-35	0-25	1-18	1-44	1-30	1-40	1-25	0-43	1-09	0-52	0-50	0-49	0-07	4-08	5-00	4-29	4-37	4-21
	767-806	100.0	"	24	[ [S]2 "	22			7	29	22	0-05	1-19	0-21	1-00	0-56	1-37	1-21	1-08	0-38	0-24	0-43	0-38	0-42	0-02	3-20	3-02	4-02	3-41	3-32
	807-900	235.0	"	24	[ [S]1½ "	23			8	31	19	0-05	1-11	0-17	0-58	1-13	1-08	1-12	1-04	0-39	0-34	0-56	0-31	0-40	0-06	3-11	3-21	3-38	3-17	3-18
	901-933	82.5	"	25	[S]1 door	30			10	40	19	0-04	1-13	0-09	0-59	1-05	0-59		1-00	0-34	0-26	1-47		0-43	0-05	3-00	2-58	4-13		3-10
	934-988	137.5	"	25	[ [S]1 "	30			11	41	16	0-04	0-54	0-12	0-49	0-44	0-56		0-50	0-28	0-34	0-34		0-30	0-06	2-29	2-30	2-42		2-32
	989-1,043	137.5	"	25	[ [S]1 "	28			11	39	13	0-05	0-52	0-14	0-51	0-44	0-52	1-14	0-52	0-33	0-24	0-51	0-35	0-35	0-04	2-34	2-18	2-53	2-59	2-37
	1,044-1,053	25.0	"	26	[ [S]1 "	25			9	34	16	0-07	0-40	0-15	1-04	1-15	0-50	0-55	1-02	0-23	0-38	0-30	0-55	0-36		3-22	3-48	3-15	3-45	3-33
	1,054-1,068	37.5		26	[ [S]1 "	26			9	35	8	0-05	0-36	0-08	0-57	0-40	1-02		0-56	0-33	0-25	0-35		0-32		2-14	1-49	2-21		2-12
	1,069-1,110	105.0	"	26	[S]1 "	30			11	41	14	0-06	1-00	0-15	0-48	0-54	1-06	1-31	0-56	0-32	0-40	0-48	0-46	0-37	0-05	2-40	2-54	3-14	3-37	2-53
	693-1,110	1,045.0		25		25			8	33	18	0-05	1-29	[T]	1-01	1-08	1-09	1-19	1-05	0-37	0-39	0-52	0-40	0-40	0-05	3-12	3-21	3-35	3-33	3-19
All	204-1,110	2,267.5		23		25			6	31	25	0-06	2-35	[T]	2-09	2-19	2-33	2-19	2-17	[U]					0-12	4-56	5-06	5-20	5-06	5-04
	69-1,110	2,605.0		20		24	2		5	31	29	0-09	4-36	[T]	2-19			2-46	2-25	[U]					0-14	7--0			7-36	7-15

SUMMARY

Weight of iron	Section between rings	Description				Ave. No. of Men in Gang					Average No. of cubic yards per ring	Mucking, per cubic yard	Average Time per ring				Unavoidable Delays (not Included in Average Time per Ring).
		Length in feet	Material	Ave. air pressure	Mehod of Excavation	Shield	Drilling	Grouting	Air Trans	Total			Shoving and mucking[T]	Erection [U]	Lost time	Total	Items	Time hrs min
Ordinary	1-68	170.0	Rock	0	[R]	20	5	5	5	32	41	0-14	9-53	5-07		15-00	First bulkhead	160--00
	69-191	307.5	Rock and earth	13	[R]	22	9		2	33	54	0-19	17-20	2-26	0-05	19-51	Second bulkhead	157--45
	192-388	492.5	Silt	18	[R]Breasting [S]7 doors	25			3	28	37	0-09	5-39	2-47	0-63	9-29	Grouting	200--00
	389-429	102.5	Silt piles and rip-rap	22	[R] Breasting [S]6 doors	24			4	28	40	0-17	12-42	3-27	0-38	16-47	Blowout	69--45
	430-692	657.5	Silt	22	[S]3 doors	24			6	30	24	0-05	1-58	2-29	0-22	4-49	Waiting for heavy iron	64--0
	204-692	1,222.5		21		25			5	30	30	0-07	3-27	2-42	0-18	6-27	Total	715--30
	69-692	1,560.0		17		23	4	0	3	30	36	0-11	6-40	2-52	0-15	9-47	Per ring	0--39
Heavy	693-1,110	1,045.0		25	[S]1 door	25			8	33	18	0-05	1-29	1-45	0-06	3-19
All	69-1,110	2,605.0		20		24			5	31	29	0-09	4-36	2-25	0-14	7-15

[R] Excavating ahead of shield.

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

[T] Including time for jacks.