قراءة كتاب Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154

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Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154

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دار النشر: Project Gutenberg

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class="fighead">Fig. 3.

cross-section

CROSS-SECTION

longitudinal section

LONGITUDINAL SECTION

plan

PLAN

Drilling Method No. 3: Heading same as second method, but larger lift taken off bench, and lift holes drilled in bottom bench in order to get down to grade in floor. Bench kept closer to heading.
	Per Round				Per Cubic Yard		Per linear Foot of Tunnel
	Total Depth Drilled	No. of Cubic Yards	Pounds of Dynamite	Adv.	Linear Feet Drilled	Pounds of Dynamite	Cu. Yd.	Linear Feet Drilled	Pounds of Dynamite
Heading	190 to 220	35 to 42	134 to 196	6½ to 8	5.4 to 6.0	3.9 to 5.0	5.3	28 to 32	20.7 to 26.5
Bench	145 ” 190	90 to 110	118 ” 167	6½ ” 8	1.6 ” 1.9	1.3 ” 1.8	13.7	22 ” 36	17.8 ” 24.7
Total							19	50 ” 58	38.5 ” 51.2
Per cubic yard, whole tunnel section								2.6 ” 3.1	2.0 ” 2.6

Blasting Notes:		Number of Sticks
Heading:	First Round: 2 to 3 relieving holes sprung, with 4 to 5 sticks each	8 to 15
	8 cut holes, 7 sticks each (sometimes shot twice)	56 to 112
	First side round, 6 holes, 6 sticks each	36
	Widening and dry holes, 10 to 12 holes, 6 sticks each	60 to 72
	Total Sticks	160 to 235
	Total Pounds	134 to 196
Sub‑bench:	4 widening holes, 4 to 5 sticks each, 2 rounds	32 to 40
	6 down holes, 5 to 7 sticks each, 2 rounds	60 to 84
Bench:	4 down holes, 5 to 7 sticks each	20 to 28
	6 to 8 lift holes, 5 to 6 sticks each	30 to 48
	Total Sticks	142 to 200
	Total Pounds	118 to 167