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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

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
الصفحة رقم: 3

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Fig. 1.

cross-section

CROSS-SECTION

longitudinal section

LONGITUDINAL SECTION

plan

PLAN

Drilling Method No. 1: Small heading, 60 to 80 ft. long. Two columns used in heading, with two drills on each. Drills on sub-bench and main bench mounted on tripods.
  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 140-155 18-21.6 93-131 5-6 8-9 5-6 3.6 29.-32 18-22
Bench 110-120 53-60 76-97 3½-4 2 1.4-1.6 15.4 30.-31 21.5-24.6
Total 19 59.63 39.5-46.6
Per cubic yard, whole tunnel section 3 to 33 2.1-2.5
Blasting Notes: Number of Sticks
Heading:

First Round: 6 sticks, 60% in each cut hole, cut generally blasted twice

 36 to 72

Second Round: 3 side holes each side, 5 sticks, 40% ea.

 30

Third Round: Rest of side holes and dry holes, 5 sticks, 40% each

 40
Stub holes, say 5 to 15
  Total Sticks 111 to 157
Total Pounds 93 to 131

Sub‑bench:

4 widening holes; 2 to 3 sticks, each, 40%

 10 to 12

6 down holes; 5 to 7 sticks, each, 40%

 30 to 42
Bench: 6 holes; 6 to 8 sticks each, 40% 36 to 48
Taking up bottom, average, say 15
Total Sticks 91 to 117
Total Pounds 76 to 97

Fig. 2.

cross-section

CROSS-SECTION

longitudinal section

LONGITUDINAL SECTION

plan

PLAN

Drilling Method, No. 2: Five drills in heading, mounted on three columns; the holes marked with a cross (X) were drilled with the drills on the center column.
  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 190-220 35-42 134-196 6½-8 5.4-6.0 3.9-5.0 5.3 28 to 32. 20.7-26.5
Bench 110-130 55 79-106 4 2.-2.4 1.4-2.0 13.7 27.-33. 19.2-27.4
Total 19 55.-65. 39.9-53.9
Per cubic yard, whole tunnel section 2.9-3.4 2.1-2.8
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, 6 sticks each

 60 to 72
Total Sticks 160 to 235
Total Pounds 134 to 196

Sub‑bench:

8 holes, 4 to 6 sticks, each

 32 to 48
Bench: 8 holes, 6 to 8 sticks, each 46 to 64
Taking up bottom, average 15
Total Sticks 95 to 127
Total Pounds 79 to 109

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