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SW-PTF Anchor

References

Permanant,
Tensile and Frictional type Anchor
(SW-PTF Anchor)
The SW-PTF, conventional tension type permanent, anchors have long been used for a variety of purposes throughout the world. The rust and corrosion resistance property of this anchoring system is ideal for permanent support of structures. The SW-PTF is used largely for permanent sheathing and shoring, tiedown anchors to resist buoyancy forces, slope stability and landslide control as well as numerous other applications.
  • SW-PTF Anchor Features
    1 Steel strand and corrugated sheath is freely adjustable according to design load and depth of installation.
    2 Anchors are manufactured in a semi-automated standardized facility resulting in stringent quality control and outstanding quality assurance.
    3 Anchors are fully assembled and packaged in coils for delivery and job site convenience. The packaging is also ideal for long-term storage of anchors.
    4 Plastic nose cone used at the distal end of the anchor provides clearance at the end of borehole adding additional protection and resistance to corrosion.
    5 The both single protection and double protection can be supplied depending on client's request.
Detail of PTF Anchor

Design/ Specifications Table 1. SW-PTF Anchor Specification (15.24mm) (ASTM A416 270 Grade, Low Relaxation)

[ASTM A-416]

No. of Steel strand
(φ = 15.24mm)
Ultimate Strength
(kN)
Yield Strength
(kN)
Allowable Design
Load (Ta) (kN)
Duct Size I.D/O.D
(mm)
Remarks
3 782 704 391 65/85 * Ultimate Strength (Breaking Load) (Tu)
= 260.7KN (1 strand)
* Yieid Strength (Load at 1% Elongation) (Ty) = 234.6kN (1 strand)

* Allowable Design Load (Ta) = 0.5 Tu
* Allowable Lock-off Load = 1.1 Ta
* Stressing Load = 0.8 Tu

Reference BS-8081:2015
4 1,043 938 521
5 1,304 1,173 652 80/105
6 1,564 1,408 782
7 1,825 1,642 912
8 2,086 1,877 1,043
9 2,346 2,111 1,173 100/130
10 2,607 2,346 1,304
11 2,868 2,581 1,434
12 3,128 2,815 1,564
13 3,389 3,050 1,695
14 3,650 3,284 1,825
15 3,911 3,519 1,955
16 4,171 3,754 2,086 125/160
17 4,432 3,988 2,216
18 4,693 4,223 2,346
19 4,953 4,457 2,477
20 5,214 4,692 2,607
21 5,475 4,927 2,737
22 5,735 5,161 2,868
23 5,996 5,396 2,998
24 6,257 5,630 3,128
25 6,518 5,865 3,259
38 9,907 8,915 4,953 150/188
49 12,774 11,495 6,387 175/230 or
200/260
Table 2. SW-PTF Anchor Specification (15.70mm) (BS-5896 Super Grade, Low Relaxation)

[BS-5896]

No. of Steel strand
(φ = 15.70mm)
Ultimate Strength
(kN)
Yield Strength
(kN)
Allowable Design
Load (Ta) (kN)
Duct Size I.D/O.D
(mm)
Remarks
3 837 738 419 65/85 * Ultimate Strength (Breaking Load) (Tu)
= 279.0KN (1 strand)
* Yieid Strength (Load at 1% Elongation) (Ty) = 246.0kN (1 strand)

* Allowable Design Load (Ta) = 0.5 Tu
* Allowable Lock-off Load = 1.1 Ta
* Stressing Load = 0.8 Tu

Reference BS-8081:2015
4 1,116 984 558
5 1,395 1,230 698 80/105
6 1,674 1,476 837
7 1,953 1,722 977
8 2,232 1,968 1,116 100/130
9 2,511 2,214 1,256
10 2,790 2,460 1,395
11 3,069 2,706 1,535
12 3,348 2,952 1,674
13 3,627 3,198 1,814
14 3,906 3,444 1,953 125/160
15 4,185 3,690 2,093
16 4,464 3,936 2,232
17 4,743 4,182 2,372
18 5,022 4,428 2,511
19 5,301 4,674 2,651
20 5,580 4,920 2,790
21 5,859 5,166 2,930
22 6,138 5,412 3,069
36 10,044 8,856 5,022 150/188
49 13,671 12,054 6,836 175/230 or
200/260
SW-PTF
Anchor Guidelines
1. Avoid damaging corrugated sheath to prevent water infiltration and corrosion issues.
2. Care shall be taken when lowering anchor into borehole to prevent damaging nose-cone. Sudden impact to bottom of borehole can damage cone resulting in external grouting difficulty and anchor performance issues.
3. Care shall be taken to prevent damaging PE sheath covering steel strand. Damage to PE sheath may result in wire corrosion resulting in permanent anchor classification issues.
4. When storing or moving anchors at constructions site, it is important that the anchor bodies are not soiled with dirt or foreign debris. Anchor contamination will result in a decrease in bond, grout compressive strengths, and overall anchor performance.
5. Caution is required to prevent collapsing of borehole when inserting anchor. Grout voids in bore hole will result in reduced anchor capacity.