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R7S 150 KSI Spin-Lock Rock Anchor
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The R7S Spin-Lock Mechanical Rock Anchor incorporates a high strength post-tension steel giving the designer the highest strength to anchor diameter ration available for use with the Spin-Lock head assembly.
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R7S Structural Properties
| Yield Stress |
Ultimate Stress |
Elongation in 20
bar diameter |
Reduction
of Area |
127.7 KSI
(880 Mpa) |
150 KSI
(1034 Mpa |
4% |
20% |
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R7S 150 KSI Spin-Lock Rock Anchor - ASTM A-722
Dia. &
Threads
Per in.
|
Recomm.
Design Load
at 2:1 Safety
Factor
|
Maximum
Working
Load
to Yield
|
Ultimate
Strength
(6)
|
Rock Type |
Drill Hole
Diameter
(1) |
Type
Head
Ass'y |
Torque ft.-lbs. |
Part
Number
|
To Expand
Shell
(2) |
On Nut
for
Tension |
1" - 8
(25 mm) |
45,000 lbs.
(200.2 kN) |
72,000 lbs.
(320.3 kN) |
90,000 lbs.
(400.4 kN) |
Rock & Concrete |
1-3/4"-(44mm)
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C 14
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500 ft.-lbs.
(650*)
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680
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R7S08C14
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1-1/4" - 7
(32 mm) |
72,500 lbs.
(321.9 kN)
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116,000 lbs.
(515.5 kN)
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145,000 lbs.
(648.8 kN)
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Rock & Concrete |
2-1/2"-(63mm)
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B 20
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750 ft.-lbs.
(1200*)
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1350
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R7S10B20
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1-1/2" - 6
(38 mm) |
105,000 lbs.
(466.6 kN) |
168,000 lbs.
(746.5 kN) |
210,000 lbs.
(932.4 kN)
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Rock & Concrete |
3"-(76mm)
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B 24
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1000 ft.-lbs.
(1700*)
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Note (3)
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R7S12B24
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1-7/8"-6
(48 mm) |
180,000 lbs.
(799.2 kN) |
289,000 lbs.
(1284.3 kN)
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360,000 lbs.
(1598.4 kN)
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Rock & Concrete |
3-1/2"-(89mm)
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C 28
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1000 ft.-lbs.
(3400*)
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Note (3)
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R7S15C28
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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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