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Strand Anchor System

Williams has added strand anchor systems to an already fine line of ground engineering products. Williams has made a commitment to the ground engineering industry to supply well engineered, quality products and back those products with technical support and timely material delivery. The same commitment has been made with the Williams strand anchor line.
Williams Strand Anchors utilize a high density extruded polyethylene sheath over corrosion inhibiting compound in the unbonded zone. Williams has the most technologically advanced extrusion equipment for the manufacture of permanent and temporary anchors. The state of the art equipment allows for precise extruded lengths in the unbonded zone and high quality manufacturing.
Williams Strand Anchors are produced from 0.6” diameter, 7 wire strand (fpu = 270 ksi, 1862 N/mm2) meeting ASTM A-416 and are manufactured in accordance with the Post-Tensioning Institute’s Recommendations for Prestressed Rock and Soil Anchors.

Advantages of Williams Grout Bonded Strand Anchors

  • High capacity - Anchors utilize a 0.6” dia. 270 KSI (ultimate stress) strand. The number of strands per anchor dictate the load carrying capacity of the anchor.
  • Lightweight - For a Class I protected anchor, the corrugated duct is grouted in the field, greatly reducing the weight of the anchor. There is more load carrying capacity per pound of 7-wire 270 KSI strand than solid bar.
  • Anchors arrive to the jobsite fully fabricated and packaged in coils to allow for installation in areas where there are clearance issues or bench width constraints.
  • Unlike bar systems, strand can be produced in any length.
  • All Williams strand anchors utilize a small diameter greased filled extruded high density polyethylene sheathing, allowing for a greater number of individual strands to be contained in a given drill hole size. Manual greasing and sheathing of individual strands require a larger free stressing sheath.
  • Stringent quality control of manufacturing is maintained because Williams’ engineering department provides shop drawings for each production order showing customer preference details and specific contract requirements.

 

Applications

  • Dam Tie-Downs
  • Temporary Excavation Support
  • Landslide Mitigation
  • Permanent Tieback Systems
  • Slope Surface Stabilization
  • Foundations
Corrosion Protection  
The anchor system can be produced to meet the Post-Tensioning Institute’s Recommendations for Prestressed Rock and Soil Anchors. Williams Strand Anchors are supplied with the following classes of Corrosion Protection:

Class I - Encapsulated Tendon:
Anchorage: Anchor Head, Bearing Plate w/ Trumpet and End Cap.
Free Stressing Length: Corrosion inhibiting compound filled HDPE sheath encased in grout.
Bond Length: Grout Filled encapsulated corrugated sheathing.

Class II - Encapsulated Tendon:
Anchorage: Anchor Head, Bearing Plate w/ optional Trumpet and optional End Cap.
Free Stressing Length: Corrosion inhibiting compound filled HDPE sheath encased in grout.
Bond Length: Externally grouted.

  

 

Design and Construction Support  
Williams is committed to assisting designers and foundation engineers with prebid design information, budget pricing and anchor details. Williams’ technical staff will work with designers to ensure that the specified strand anchor system is economical and appropriate for the application.

Williams is also committed to assisting the contractor with project pricing, bearing plate calculations, quantity take-offs, anchor submittals and shop drawings. Williams’ manufacturing personnel will work with the technical staff to ensure the anchors are delivered to the jobsite, ready to install and on time. Williams also offers on-site technical assistance to the contractor.

    

Number
of
Strands
Cross-Sectional
Area
(Aps)
Ultimate
Load
(fpu*Aps)
Maximum
Jacking Load
(0.8*fpu*Aps)
Maximum
Design Load
(0.6*fpu*Aps)
 HDPE
Tubing		 Anchor
Heads
1
0.217 in2
(140 mm2)
 58.6 kips
(261 kN)		 46.9 kips
(209 kN)		 35.2 kips
(157 kN)		 3” nom.
(3-1/2” O.D.)		 C 4.6
2
0.434 in2
(280 mm2)

117 kips
(522 kN)

93.8 kips
(418 kN)

70.4 kips
(314 kN)
3
0.651 in2
(420 mm2)

176 kips
(783 kN)

141 kips
(627 kN)

106 kips
(471 kN)
4
0.868 in2
(560 mm2)

234 kips
(1044 kN)

188 kips
(836 kN)

141 kips
(628 kN)

 C 7.6*
5 1.09 in2
(700 mm2)

293 kips
(1305 kN)

235 kips
(1045 kN)

176 kips
(785 kN)
6 1.30 in2
(840 mm2)		 352 kips
(1566 kN)		 281 kips
(1254 kN)		 211 kips
(942 kN)
7 1.52 in2
(980 mm2)

410 kips
(1827 kN)

328 kips
(1463 kN)

246 kips
(1099 kN)
8 1.74 in2
(1120 mm2)		 469 kips
(2088 kN)		 375 kips
(1672 kN)		 282 kips
(1256 kN)		 C 12.6
9 1.95 in2
(1260 mm2)

527 kips
(2349 kN)

422 kips
(1881 kN)

317 kips
(1413 kN)

 4” nom.
(4.6” O.D.)
10 2.17 in2
(1400 mm2)

586 kips
(2610 kN)

469 kips
(2090 kN)

352 kips
(1570 kN)
11 2.39 in2
(1540 mm2)

645 kips
(2871 kN)

516 kips
(2299 kN)

387 kips
(1727 kN)
12 2.60 in2
(1680 mm2)

703 kips
(3132 kN)

563 kips
(2508 kN)

422 kips
(1884 kN)
13 2.82 in2
(1820 mm2)

762 kips
(3393 kN)

610 kips
(2717 kN)

458 kips
(2041 kN)

 5” nom.
(5.6” O.D.)		 C 19.6
14 3.04 in2
(1960 mm2)

820 kips
(3654 kN)

657 kips
(2926 kN)

493 kips
(2198 kN)
15 3.26 in2
(2100 mm2)

879 kips
(3915 kN)

704 kips
(3135 kN)

528 kips
(2355 kN)
16 3.47 in2
(2240 mm2)

938 kips
(4176 kN)

750 kips
(3344 kN)

563 kips
(2515 kN)
17 3.69 in2
(2380 mm2)

996 kips
(4437 kN)

797 kips
(3553 kN)

598 kips
(2669 kN)
18 3.91 in2
(2520 mm2)

1055 kips
(4698 kN)

844 kips
(3762 kN)

634 kips
(2826 kN)
19 4.12 in2
(2660 mm2)

1113 kips
(4959 kN)

891 kips
(3971 kN)

669 kips
(2983 kN)
20 4.34 in2
(2800 mm2)

1172 kips
(5220 kN)

938 kips
(4180 kN)

704 kips
(3140 kN)

 C 22.6
21 4.56 in2
(2940 mm2)

1231 kips
(5481 kN)

985 kips
(4389 kN)

739 kips
(3297 kN)

 6” nom.
(6.6” O.D.)
22 4.77 in2
(3080 mm2)

1289 kips
(5742 kN)

1032 kips
(4598 kN)

774 kips
(3454 kN)
23 4.99 in2
(3220 mm2)

1348 kips
(6003 kN)

1079 kips
(4807 kN)

810 kips
(3611 kN)

 C 27.6
24 5.21 in2
(3360 mm2)

1406 kips
(6264 kN)

1126 kips
(5016 kN)

845 kips
(3768 kN)
25 5.43 in2
(3500 mm2)

1465 kips
(6525 kN)

1173 kips
(5225 kN)

880 kips
(3925 kN)
26 5.64 in2
(3640 mm2)

1524 kips
(6786 kN)

1219 kips
(5434 kN)

915 kips
(4082 kN)
27 5.86 in2
(3780 mm2)

1582 kips
(7047 kN)

1266 kips
(5643 kN)

950 kips
(4239 kN)
28 6.08 in2
(3920 mm2)

1640 kips
(7308 kN)

1313 kips
(5852 kN)

986 kips
(4396 kN)

 C 31.6
29 6.29 in2
(4060 mm2)

1699 kips
(7569 kN)

1360 kips
(6061 kN)

1021 kips
(4553 kN)
30 6.51 in2
(4200 mm2)

1758 kips
(7820 kN)

1407 kips
(6270 kN)

1056 kips
(4710 kN)
31 6.73 in2
(4340 mm2)

1816 kips
(8091 kN)

1454 kips
(6479 kN)

1091 kips
(4867 kN)

* Use a C4.6 Anchor Head for Class II protection on a four strand anchor.
1) Mill certification provided upon request to indicate the actual tensile strength of the 7-wire strand with each shipment of Williams strand anchors.
2) Larger diameter anchors available upon request.

   
   

Design and Construction Support  
Williams is committed to assisting designers and foundation engineers with prebid design information, budget pricing and anchor details. Williams’ technical staff will work with designers to ensure that the specified strand anchor system is economical and appropriate for the application.

Williams is also committed to assisting the contractor with project pricing, bearing plate calculations, quantity take-offs, anchor submittals and shop drawings. Williams’ manufacturing personnel will work with the technical staff to ensure the anchors are delivered to the jobsite, ready to install and on time. Williams also offers on-site technical assistance to the contractor.

    

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