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SW-PTR Anchor

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Permanant,
Tensile and load distributive
Tension material Replaceable
Anchor
(SW-PTR Anchor) SW-PTR, Permanent, Tensile and Replaceable, is Anchor which improves the structure of load Mechanism of existing tensile permanent anchor. By using load distribution effect, it is easy to realize high load and has improved the unzipping of stranded wire which is a drawback of conventional tensile type anchor. This is an anchor construction method that is suitable for reinforcement of long-term permanent structures by replacing the stranded wire when necessary, by maintaining a more reliable maintenance.
  • SW-PTR Anchor Features
    1 Suppress grout breakage during tension by using load distribution effect
    2 Replacement of strand in case of anchor head strand corrosion
    3 Semi-automated standardized production secures product quality
    4 Resistant to corrosion due to use of plastic nosecone at the tip of anchor body
    5 According to the purpose of the structure and the design specification, both single and double protection can be produced
Why need to replace the strand? Maintenance is not possible due to erosion of strand during long-term
maintenance after permanent anchor construction

SW-PTR Anchor : Design/ Specifications Table 1. SW-PTR 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 80/105 * 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
6 1,564 1,408 782 100/130
7 1,825 1,642 912
8 2,086 1,877 1,043
9 2,346 2,111 1,173
10 2,607 2,346 1,304
Table 2. SW-PTR 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 80/105 * 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
6 1,674 1,476 837 100/130
7 1,953 1,722 977
8 2,232 1,968 1,116
9 2,511 2,214 1,256
10 2,790 2,460 1,395