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R1H High Grade Hollow-Core Spin-Lock Anchor
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Though years of development Williams has produced and patented the Pre-stressable, Hollow-Core, Groutable Spin-Lock Rock Bolting Systems. The hollow-core allows the bolt to always be grouted from the lowest gravitational point. In an up-bolting situation, the grout is pumped in through the plastic grout tube and begins to fill the drill hole from the plate. The grout rises until the entire hole is filled and the grout returns through the hollow bar. In down grouting situations, the grout is pumped through the hollow bar and starts at the bottom of the hole. It rises and returns through the de-air tube when the hole is filled. Improperly or incomplete grouted bolts are subjected to relaxation and corrosion. Pre-measured capsule systems cannot properly account for unknown fissures and voids and often leave the bolt vulnerable to deterioration. The Williams Hollow-Core Grouting System spreads grout through the rock fissures creating a completely protected monolithic section including rock, grout and bolt.
Because the Spin-Lock head assembly provides 300º perimeter expansion anchorage and develops the full strength of the rod, the hollow-core rock bolt may be pre-stressed to the desired load and tested prior to grouting.
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R1H Structural Properties
| Yield Stress |
Ultimate Stress |
Elongation in
2" (51 mm) |
Reduction of Area |
91 KSI
(627 Mpa) |
124 KSI
(854 Mpa) |
15% |
40% |
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R1H High Grade Hollow-Core Spin-Lock Rock Anchor - ASTM A615 Deformation Pattern
Dia. &
Threads
Per in.
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Recomm.
Design Load
at 2:1 Safety
Factor
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Maximum
Working
Load
to Yield
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Ultimate
Strength
(6)
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Rock Type |
Drill Hole
Diameter
(1) |
Type
Head
Ass'y |
Torque ft.-lbs.
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Part
Number
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To Expand
Shell
(2)
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On Nut
for
Tension
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1" - 8
(25mm)
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33,000 lbs.
(146.8 kN)
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47,000 lbs.
(209.1 kN)
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66,000 lbs.
(293.5 kN)
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Hard & Medium |
1-5/8" - (41 mm) |
A 13 |
250 ft.-lbs.
(450*) |
400 |
R1H08A13 |
| Medium & Weak |
1-3/4" - (44 mm) |
B 14 |
R1H08B14 |
| Weak Rock & Concrete |
1-3/4" - (44 mm) |
C 14 |
R1H08C14 |
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Rock & Concrete
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2" - (51 mm) |
B 14 |
R1H08B16 |
1-3/8" - 8
(35mm)
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69,000 lbs.
(306.9 kN)
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100,000 lbs.
(444.8 kN)
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138,000 lbs.
(613.8 kN)
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Rock & Concrete |
2-1/2" - (63 mm) |
B 20 |
750 ft.-lbs.
(1200*) |
Note (3) |
R1H11B20 |
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Rock & Concrete
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3" - (89 mm) |
B 24 |
R1H11B24 |
2" - 6
(51mm)
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150,000 lbs.
(667.2 kN)
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219,000 lbs.
(974.2 kN)
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300,000 lbs.
(1334.4 kN)
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Rock & Concrete |
3-1/2" - (89 mm) |
C 28 |
1000 ft.-lbs.
(3700*)
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Note (3)
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R1H16C28
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NOTES:
(*) Do not exceed these numbers
(1) Care should be taken to drill a straight and properly sized hole.
(2) A function of strata strength. More torque may be required on long bolts or in special rock conditions. Consult your Williams Representative for more specific details.
(3) Stress to desired tensile load using a hollow ram hydraulic jack. Consult your Williams Representative.
(4) WILLIAMS reserves the right to ship full length or coupled units as necessary.
(5) ACI 355.1R section 3.2.5.1 indicates an ultimate strength in shear has a range of .6 to .7 of the ultimate tensile strength. Designers should provide adequate safety factors for safe shear strengths based on the condition of use.
(6) Inconsistencies in rock from site to site and even from hole to hole may affect anchor performances. Fissures, voids, seams, rock psi, drilling through clay or bentonite and direction of bedding planes are all possible variables. Should problems occur, consult Williams for troubleshooting.
(7) All above torque values are used for clean, dry (un-greased) threads. For greased thread torque values, contact your local Williams representative.
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 Williams Form Engineering Corp. All rights reserved. |
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