CATALOT CÁP DỰ ỨNG LỰC HÃNG VSL VÀ QVM

VSL Australia Post-Tensioning Systems OCT 2019 INTRODUCTION VSL CAPABILITIES MULTISTRAND POST-TENSIONING STRAND PROPERTIES – TO AS 4672 10 TENDON PROPERTIES 10 SELECTED DESIGN CONSIDERATIONS 11 VSL STRESSING ANCHORAGE TYPE SC LIVE END 12 VSL COUPLING ANCHORAGE TYPE KAS - FOR USE WITH SC ANCHORAGE 13 INTERMEDIATE ANCHORAGE TYPE Z 14 VSL DEAD END ANCHORAGE 15 SHEATHING & CORROSION PROTECTION 16 DIMENSIONS OF PT-PLUS® DUCTS 16 ECCENTRICITY OF TENDONS 16 STRESSING SEQUENCE 17 STRESSING 17 GROUTING 17 JACK CLEARANCE REQUIREMENTS 18 STRESSING JACK DETAILS 18 SLAB POST-TENSIONING 21 STRAND PROPERTIES – TO AS 4672 22 TENDON PROPERTIES 22 SELECTED DESIGN CONSIDERATIONS 23 VSL STRESSING ANCHORAGE TYPE S5 – S6 LIVE END 24 VSL DEAD END ANCHORAGES TYPE H – TYPE P 25 VSL SLAB COUPLING ANCHORAGE TYPE S 26 JACK CLEARANCE REQUIREMENTS 27 STRESSING JACK DETAILS 27 INTERNAL STRESSING POCKET 27 ANCHORAGE REINFORCEMENT – S5-3, S5-4, S5-5, S6-3, S6-4 ANCHORS 28 ANCHORAGE REINFORCEMENT – S6-5 ANCHORS 28 ANCHORAGE REINFORCEMENT - TIES 29 STRESSING JACK DETAILS 29 GROUND ANCHORS 32 VSL PERMANENT ANCHOR FULLY ENCAPSULATED 33 VSL TEMPORARY ANCHOR 33 VSL PERMANENT GROUND ANCHORS - 15.2mm STRAND 34 VSL CT STRESSBAR GROUND ANCHORS 34 VSL TEMPORARY GROUND ANCHORS 34 VSL PERMANENT GROUND ANCHORS BEARING PLATE AND ANCHORHEAD 35 STRESSING 36 FLAT JACKS 39 CONTACT US 40 Post-tensioning is, even so being a mature technology, still a fantastic tool for the design engineer to actively define the internal load path in concrete structures by superposing a favorable internal stress state This permits to minimize deformations, helps to increase slenderness of members, reduces reinforcement congestion, enables segmental construction without need for wet joints and allows the use of high strength steel This brochure gives an overview of the available post-tensioning systems and their fields of application It provides guidance to practising engineers in the design of post-tensioned structures using VSL post-tensioning systems VSL is a recognised leader in the field of special construction systems Well proven technical systems and sound in-house engineering are the basis of the group’s acknowledged reputation for innovative conceptual structural solutions VSL has developed, manufactured and installed durable, state-of-the-art post-tensioning systems for over 60 years The VSL post-tensioning systems comply with international standards and approval guidelines for use on both new and existing structures VSL does not only select and offer the best suited post-tensioning hardware and layout for a given project but proposes also innovative detailing of the permanent work and construction techniques with the aim to improve durability, increase site safety and reduce construction time and costs VSL likes to work in partnership with owners and clients right from the conceptual stage VSL’s engineers can work closely with the design engineer during the design development stage and with the contractor's estimating team during the tender stage What differentiates VSL from other players in the market, is its holistic approach, which is fundamental in arriving at well balanced technical solutions respecting equally permanent work and construction aspects VSL’s biggest asset however is the quality of its highly experienced, multicultural staff /// VSL has evolved from a specialist post-tensioning company into a multi-discipline construction partner, capable of providing contractors and engineers with construction and engineering services for highly complex and demanding projects Well-proven technical systems and in-house engineering form the basis of the group’s reputation for innovative conceptual designs and engineering solutions that ensure reliability, quality and efficiency VSL take this engineering ability through to execution of works on site to be a one stop shop for specialist construction VSL’s capabilities can be categorised into four different services: /// SYSTEMS & TECHNOLOGIES We ensure the development and constant improvement of our portfolio of in-house technologies Our Services: Post-tensioning systems Ground Anchors VSoL Walls – Retained Earth System VSL Stress Bars Engineered Precast Structures Stay Cables /// REPAIRS & STRENGTHENING We offer tailored services to ensure the stability of your structure’s life cycle, from inspections and assessment through to repair works and upgrading Our Services Structural Diagnostics & Monitoring Repairs & Strengthening Infrastructure Protection High Strength Concrete Solutions & Products /// /// CIVIL CONSTRUCTION We help our clients with construction designs and methods, and provide operational skills for specific applications Our Services: Bridge Construction Containment Structures Heavy lifting Engineered Precast Structures Offshore Structures /// GROUND ENGINEERING We are specialists in ground engineering and special foundations thanks to our long history of proven design and build capabilities gained on the most complex and varied projects Our Services Diaphragm walls Micro Compaction Subsurface grouting Micro Piling & Ground Anchors High Directional drilling & Coring Ground Freezing VSL Multistrand Post-Tensioning /// /// Since 1954, designers and constructors of bridges, buildings and civil engineering worldwide over have relied on the VSL Multistrand post-tensioning system These conventional uses of post-tensioning have been augmented by numerous applications of the system to projects such as stayed structures, offshore platforms, towers, tanks, silos, nuclear power plants, underground and submerged structures Patented in 36 countries, the VSL strand system complies in all respects with the Recommendations for the Acceptance and Application of Post-Tensioning Systems of the Fédération Internationale de la Précontrainte (FIP) and is approved in every country where the use of post-tensioning systems is subject to an official authorisation The VSL Multistrand system comprises from three to fifty-five strands (either 12.7 or 15.2mm diameter), round duct and anchorages Prestressing force is applied to the tendons after the casting and curing of surrounding concrete All strands are stressed simultaneously using a hydraulic jack and are fastened at the live end by wedge grips The free space inside the duct is then pressure-filled with cement grout A number of features are incorporated as a result of many years of experience in the field:     Stressing carried out in any number of stages; Accurate control of prestress force; No need to determine tendon length in advance; Simultaneous stressing of all strands in a tendon, with individual locking of each strand at the anchorage point; VSL stressing equipment is easily operated to ensure a safe and rapid stressing procedures Special emphasis has been placed on rationalised manufacturing of equipment and anchorage parts as well as efficient work site practice PT Strands, Australia Ballina Bypass, Australia Westlink M7, Sydney, Australia /// Nominal Diameter – Grade Nominal Steel Area Nominal Mass Minimum Breaking Load (mm)-(MPA) (mm2) (kg/m) 12.7 Super 15.2 EHT 98.6 143 0.774 1.122 Strand Type 12.7mm Super Tendon No of Strands Unit 5-4 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 5-7 5-12 5-19 5-22 5-27 5-31 5-37 5-42 5-48 5-55 Min Elong To Fracture in 500mm (%) Relaxation After 1,000 Hrs at 0.8 Breaking Load (%) Modulus of Elasticity (kN) Minimum Proof Load (0.2% Offset) (kN) 184 261 156 222 3.5 3.5 3.5 3.5 185-205 185-205 Minimum Breaking Load (kN) Steel Duct Internal Diameter (mm) 368 552 736 920 1104 1288 1472 1656 1840 2024 2208 2392 2576 2760 2944 3128 3312 3496 3680 3864 4048 4232 4416 4600 4784 4968 5152 5336 5520 5704 5888 6072 6256 6440 6624 6808 6992 7176 7360 7544 7728 7912 8096 8280 8464 8648 8832 9016 9200 9384 9568 9752 9936 10120 40 40 40 50 50 50 70 70 70 70 70 85 85 85 85 85 85 85 90 90 90 95 95 95 95 95 105 105 105 105 115 115 115 115 115 115 120 120 120 120 120 130 130 130 130 130 130 135 135 135 135 135 135 135 Strand Type 15.2mm EHT Tendon No of Strands Unit 6-3 6-4 6-7 6-12 6-19 6-22 6-27 6-31 6-37 6-42 6-48 6-55 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 (GPa) Minimum Breaking Load (kN) Steel Duct Internal Diameter (mm) 522 783 1044 1305 1566 1827 2088 2349 2610 2871 3132 3393 3654 3915 4176 4437 4698 4959 5220 5481 5742 6003 6264 6525 6786 7047 7308 7569 7830 8091 8352 8613 8874 9135 9396 9657 9918 10179 10440 10701 10962 11223 11484 11745 12006 12267 12528 12789 13050 13311 13572 13833 14094 14355 40 40 50 70 70 70 85 85 85 85 85 95 95 95 95 95 95 95 105 105 105 115 115 115 115 115 120 120 120 120 130 130 130 130 130 130 135 135 135 135 135 145 145 145 145 145 145 155 155 155 155 155 155 155 Note: 10 /// Intermediate Duct diameters may be available on application Duct diameters are for corrugated steel duct Duct external dia = inside dia + 6mm nominal Corrugated PT-Plus duct is also available, refer to page 16 For special applications, other strand and tendon capacities are available Anchorage size up to 6-91 available on special order from overseas 12.9mm, 15.2mm and 15.7mm minimum breaking 300kN breaking load strand available as special order from overseas Plaq PT:PT Brochure 15/01/10 11:16 Page14 VSL POST-TENSIONING FOR SLAB ON GRADE CONSTRUCTION: THE COST-EFFECTIVE SOLUTION Benefits to the owner Elimination of joints: Owners and operators benefit from the elimination of all or most of the costly joints, when using post-tensioned slab on grade Wal-Mart, Mexico - 2007 Shorter construction time: Compared with ordinary reinforced concrete slabs, the use of VSL’s technologies leads to less excavation, a thinner slab, little or no reinforcement and few if any joints Large areas in excess of 2,500m2 can be concreted, which results in a shorter construction time and contributes to a very competitive initial cost “Crack free” performance: Initial stressing can prevent shrinkage cracking Post-tensioning compresses the slab and counteracts tensile stresses that would otherwise cause cracking under the worst combinations of loads or in poor soil conditions High impact and abrasion resistance: The compression resulting from post-tensioning combined with an optimum concrete strength and surface treatment reduces general wear and tear and subsequent maintenance costs Low maintenance: The significant reduction in the number of joints means that less maintenance is required, giving great improvements in operational efficiency Hangar Mosnov, Czech Republic - 2007 Austrak, Australia - 2003 Large slabs, indoor or outdoor VSL Post-tensioning is widely used in the construction of pavement areas and in slabs on grade, where a concrete slab foundation is placed directly on the ground Its advantages provide benefits in many different types of projects including warehouses, distribution centres, container storage terminals, rail and shipping terminals, airports, manufacturing facilities and as floor bases for liquid retaining structures Post-tensioned slabs are also used for residential purposes and in recreation, such as for tennis courts and skating rinks VSL can provide the full range of services from the installation of post-tensioning to the complete design and construction of the concrete slab Nestlé Distribution Plant, Chile - 2001 The 30,000m2 of joint-free slab of the Nestlé Plant constructed by VSL Chile represent the present world record 14 V S L P O S T- T E N S I O N I N G S O L U T I O N S Plaq PT:PT Brochure 15/01/10 11:17 Page15 VSL POST-TENSIONING FOR SPECIAL STRUCTURES: A SMART ALTERNATIVE PIPELINE CONSTRUCTION Sea water pipeline, Morocco - 2007 This 2km-long pipeline south of Casablanca has an internal diameter of 2.5m with a 300mm-thick wall Structural integrity and water-tightness is provided by transverse post-tensioning using sheathed monostrand with an average of three loops and longitudinal tendons of 6-12 units of 100m length SUB-STRUCTURE CONSTRUCTION Machang Bridge, Korea - 2006 Post-tensioning tendons with VSL Loop Anchorages were installed for the deck-to-pile footing tie-down system in the piers supporting the bridge’s back spans Versatile applications Without post-tensioning, many special structures could only be built with great effort, if built at all Over the years, VSL’s posttensioning services have been used for a very wide range of highly prestigious and complex structures including offshore platforms, concrete floating barges, dams and many others Customers value the experience and versatility they gain by having VSL as a partner from the early planning stages through to construction STADIUM CONSTRUCTION Sazka Stadium Prague, Czech Republic - 2003 The challenge of building a multifunctional stadium with two halls that are part of irregular and complicated structural elements is an excellent example of a project where clients can benefit from the versatility of VSL as a professional post-tensioning partner TUNNEL CONSTRUCTION - WHETHER HYDROSTATIC PRESSURE PUSHES FROM INSIDE Thun Bypass Tunnel, Switzerland - 2008 A 1.2km-long tunnel of 5.4m diameter was built to increase the discharge from Lake Thun The prevailing pressure conditions led to the use of a 1.2m-wide lining segment that was post-tensioned with two tendons, each with two 0.5” monostrands encapsulated in plastic ducts VSL was fully involved in the planning and conceptual phase of the posttensioning tendon details OR OUTSIDE Thu Thiem Immersed Tunnel, Vietnam - 2008/2009 The tunnel crosses under the Saigon River in Ho Chi Minh City and is made up of four precast tunnel units, each 33m wide, 9m high and 90m long The elements are post-tensioned longitudinally with 6-12 tendons, then sealed at both ends, floated, towed to site and sunk VSL also carried out the design, supply and erection of four sets of formwork to cast 15m–long segments V S L P O S T- T E N S I O N I N G S O L U T I O N S 15 Plaq PT:PT Brochure 15/01/10 11:17 Page16 VSL POST-TENSIONING FOR REPAIR WOR A MUST FOR TAILOR-MADE SOLUTIONS Structural remedial work requires thorough diagnosis of damage and deterioration followed by full assessment of the causes, risks and consequences involved VSL employs state-of-the-art equipment and special inspection techniques to detect defects in reinforced and prestressed concrete structures before any significant damage occurs Close co-operation with materials testing institutes and structural designers, together with the use of the latest investigation techniques, enables VSL to prepare precise and comprehensive reports Assessment diagnosis of structural conditions includes: • inspection and surveillance of concrete structures; • condition evaluation of the same; • root cause analysis; • design of repair strategies; • estimating the order of magnitude for the cost of repairs REPLACEMENT OF EXTERNAL POST-TENSIONING IN BRIDGES St Cloud Viaduct, France - 2000 The external tendons that reinforced the 1974-built 1,102m-long Saint-Cloud Bridge near Paris showed signs of corrosion and the client decided to replace them As a first precautionary step, shock-absorbers were fitted at each side of the deviators before the tendons were cut and the anchorages removed or adapted New external tendons were then installed by VSL REPAIR OF BRIDGES Figueira de Foz Bridge, Portugal - 2005 VSL, in partnership with a local contractor, carried out repair works including external post-tensioning, strengthening of the abutments with bars and replacement of expansion joints There was also retrofitting of structural bearings and seismic devices, including the installation of x 500kN shock-absorbers at the abutments 16 V S L P O S T- T E N S I O N I N G S O L U T I O N S Plaq PT:PT Brochure 15/01/10 11:17 Page17 ORKS: STRENGTHENING OF HISTORICAL BUILDINGS Las Arenas Bullfighting Ring, Spain - 2007 One of the many examples in Barcelona where VSL has assisted with engineering and specialised site works is this former bull ring, built in 1898, which has been transformed into a leisure and entertainment complex VSL carried out engineering and post-tensioning works in connection with the transfer slab and beams of the Neo-Mudộjar faỗade The project involved post-tensioned floors with spans of between 12m and 17m and the supply of other VSL products such a neoprene bearings and studs SILO REPAIR AND STRENGTHENING Blue Circle Cement Silo, Singapore - 2001 The 60m-tall silo was strengthened using a VSLengineered solution of externally wrapped, bonded tendons each with four strands of 0.6” The 66 tendons are encapsulated in flat high-density polyethylene ducts and anchored into special stressing brackets The Leaning Tower of Pisa, Italy - 1993 VSL strengthened the world-renowned Leaning Tower of Pisa with 18 specially-developed monostrand hoop tendons The optimum solution consisted of a marble-coloured PE-sheath and galvanized, non-greased 0.6" strand with a centre stressing anchorage, allowing force adjustment and monitoring during and after the stressing operation STRENGTHENING OF A NUCLEAR POWER PLANT Gösgen Nuclear Power Plant, Switzerland - 2005 A carbon fibre tendon system was used for the seismic upgrade of the emergency feed building at the Gösgen nuclear power plant The system consists of carbon CFRP plates and head and is well suited for seismic and other strengthening measures where post-tensioning forces are needed in very thin tensile members VSL’s other repair solutions VSL also provides other structural solutions for the repair and strengthening of structures including: • passive strengthening with the design and application of: - bonded CFRP (carbon fibre reinforced polymer); - bonded SRP (steel reinforced polymer) ã protection with: - Ductalđ, the ultra-high-strength and ductile blast-resistant solution; - dampers for mitigation of vibration induced by earthquake, wind and human activities; - cathodic protection for corrosion mitigation V S L P O S T- T E N S I O N I N G S O L U T I O N S 17 Plaq PT:PT Brochure 15/01/10 11:17 Page18 GROUND ENGINEERING Ground anchors CONSTRUCTION VSoL® walls Bridges D-walls & Piles Buildings Ground improvement REPAIR, STRENGTHENING & PRESERVATION Slab on grade 36.25 3178.25 Containment structures Structural diagnostics & Monitoring Repair & Strengthening Special structures Protection & Preservation Heavy lifting SYSTEMS & TECHNOLOGIES Formwork & Equipment • Post-tensioning strand systems • Bars & post-tensioning bar systems • Stay cable systems • Damping systems (stays & buildings) ã Ductal đ UHP concrete ã Bearings & Joints www.vsl.com 18 V S L P O S T- T E N S I O N I N G S O L U T I O N S Plaq PT:PT Brochure 15/01/10 11:17 Page19 VSL TECHNICAL DATA AND DESIGN CONSIDERATIONS STRAND AND TENDON PROPERTIES PT-PLUS® DUCT SYSTEM DATA TENDON LAYOUT, RADII, FRICTION AND TENDON LOSSES FOR INTERNAL AND EXTERNAL CABLES BLOCK-OUTS AND EQUIPMENT DATA V S L P O S T- T E N S I O N I N G S O L U T I O N S 19 Plaq PT:PT Brochure 15/01/10 11:17 Page20 - STRAND 1.1 - STRAND PROPERTIES 13mm (0.5”) Strand type Nominal diameter Nominal cross section Nominal mass Nominal yield strength Nominal tensile strength Specif./min breaking load Young’s modulus Relaxation3 after 1000 h at 20°C and 0.7 x Fpk d Ap M fp0,1k fpk Fpk prEN 10138 – (2006) Y1860S7 12.5 12.9 93 100 0.726 0.781 16341 16401 1860 1860 173 186 (mm) (mm2) (kg/m) (MPa) (MPa) (kN) (GPa) ASTM A 416-06 Grade 270 12.7 98.7 0.775 16752 1860 183.7 approx 195 max 2.5 (%) 1) Characteristic value measured at 0.1% permanent extension 2) Minimum load at 1% extension for low-relaxation strand 3) Valid for relaxation class acc to prEN 10138-3 or low-relaxation grade acc to ASTM A 416-06 1.2 - TENDON PROPERTIES 13mm (0.5”) Strands numbers Steel area ASTM Y1860S7 (prEN) Steel pipes Ø ext x t e Ap acc to prEN Corrugated steel duct3 Corrugated plastic duct (recommended) VSL PT-PLUS® Grade 270 Øi / Øe e Øi / Øe e ø (ASTM) Breaking load Eccentricity Unit 5-1 5-2 5-3 5-4 5-7 5-7 5-12 5-12 5-15 5-15 5-19 5-19 5-22 5-22 5-27 5-27 5-31 5-31 5-37 5-37 5-43 5-55 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 43 55 d=12.5 mm Ap=93 mm2 d=12.9 mm Ap=100 mm2 d=12.7 mm d=12.5 mm Ap=100 mm2 Ap=93 mm2 d=12.9 mm Ap=100 mm2 d=12.7 mm Ap=98.7 mm2 [mm2] [mm2] [mm2] [kN] [kN] [kN] [mm] [mm] [mm] [mm] [mm] 93 186 279 372 465 558 651 744 837 930 1023 1116 1209 1302 1395 1488 1581 1674 1767 1860 1953 2046 2139 2232 2325 2418 2511 2604 2697 2790 2883 2976 3069 3162 3255 3348 3441 3999 5115 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 4300 5500 98.7 197 296 395 494 592 691 790 888 987 1086 1184 1283 1382 1481 1579 1678 1777 1875 1974 2073 2171 2270 2369 2468 2566 2665 2764 2862 2961 3060 3158 3257 3356 3455 3553 3652 4244 5429 173 346 519 692 865 1038 1211 1384 1557 1730 1903 2076 2249 2422 2595 2768 2941 3114 3287 3460 3633 3806 3979 4152 4325 4498 4671 4844 5017 5190 5363 5536 5709 5882 6055 6228 6401 7439 9515 186 372 558 744 930 1116 1302 1488 1674 1860 2046 2232 2418 2604 2790 2976 3162 3348 3534 3720 3906 4092 4278 4464 4650 4836 5022 5208 5394 5580 5766 5952 6138 6324 6510 6696 6882 7998 10230 183.7 367 551 735 919 1102 1286 1470 1653 1837 2021 2204 2388 2572 2756 2939 3123 3307 3490 3674 3858 4041 4225 4409 4593 4776 4960 5144 5327 5511 5695 5878 6062 6246 6430 6613 6797 7899 10104 20/25 35/40 35/40 40/451 45/50 45/50 50/57 55/62 55/62 60/67 60/67 60/67 65/72 65/72 70/77 70/77 75/82 75/82 75/82 80/87 80/87 80/87 85/92 85/92 90/97 90/97 95/102 95/102 95/102 95/102 95/102 100/107 100/107 100/107 110/117 110/117 110/117 120/127 130/137 8 10 9 9 11 10 10 12 11 14 13 15 14 13 12 11 13 12 12 17 17 16 18 17 22/25 76/252 76/252 76/252 58/63 58/63 58/63 58/63 58/63 58/63 58/63 58/63 76/81 76/81 76/81 76/81 76/81 76/81 76/81 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 115/121 115/121 115/121 115/121 115/121 115/121 130/136 130/136 14 12 11 10 9 14 13 12 12 11 10 20 19 18 19 18 19 18 17 16 15 14 13 20 19 19 19 19 18 23 17 25.0 x 2.0 31.8 x 2.0/2.5/3.0 33.7 x 2.0/2.5/3.0 42.4 x 2.0/2.5/3.0 60.3 x 2.0/2.5/3.0 60.3 x 2.0/2.5/3.0 70.0 x 2.0/2.5/3.0 70.0 x 2.0/2.5/3.0 82.5 x 2.0/2.5/3.0 82.5 x 2.0/2.5/3.0 88.9 x 2.5/3.0/3.5 88.9 x 2.5/3.0/3.5 88.9 x 2.5/3.0/3.5 88.9 x 2.5/3.0/3.5 101.6 x 3.0/4.0/5.0 101.6 x 3.0/4.0/5.0 108.0 x 3.0/4.0/5.0 108.0 x 3.0/4.0/5.0 114.3 x 3.0/4.0/5.0 114.3 x 3.0/4.0/5.0 127.0 x 3.0/4.0/5.0 139.7 x 3.0/4.0/5.0 1) Flat ducts possible as well 2) Flat duct PT-PLUS® with rectangular slab anchorages, for PT-PLUS® see also under 3.1.3 3) If flat ducts (steel or PT PLUS®) to be used with square type castings please contact your VSL representative In plan view, tendons with slab type anchorages must be straight between anchorages or have only unidirectional turns with radii of > m Strands must always be pushed-in prior to concreting Eccentricity e: negligible 4) Given values may slightly vary depending on local availability of ducts They are minimal for most applications For special cases (long tendons, many curvatures, small radii etc.) greater size duct is recommended – please verify with VSL In any case the filling ratio (cross-section steel / duct) must not exceed 0.5 (EN523) 5) Please check with the nearest VSL office for the complete anchorage list 20 V S L P O S T- T E N S I O N I N G S O L U T I O N S Plaq PT:PT Brochure 15/01/10 11:17 Page21 1.3 - STRAND PROPERTIES 15mm (0.6”) Strand type Nominal diameter Nominal cross section Nominal mass Nominal yield strength Nominal tensile strength Specif./min breaking load Young’s modulus Relaxation3 after 1000 h at 20°C and 0.7 x Fpk d Ap M fp0,1k fpk Fpk prEN 10138 – (2006) Y1860S7 15.3 15.7 140 150 1.093 1.172 16361 16401 1860 1860 260 279 (mm) (mm2) (kg/m) (MPa) (MPa) (kN) (GPa) ASTM A 416-06 Grade 270 15.24 140 1.102 16762 1860 260.7 approx 195 max 2.5 (%) 1) Characteristic value measured at 0.1% permanent extension 2) Minimum load at 1% extension for low-relaxation strand 3) Valid for relaxation class acc to prEN 10138-3 or low-relaxation grade acc to ASTM A 416-06 1.4 - TENDON PROPERTIES 15mm (0.6”) Strands numbers Steel area ASTM Y1860S7 (prEN) d=15.3 mm d=15.7 mm Ap=140 mm2 Ap=150 mm2 Steel pipes Ø ext x t e Ap acc to prEN Corrugated steel duct3 Corrugated plastic (recommended) duct VSL PT-PLUS® Grade 270 Øi / Øe e Øi / Øe e ø (ASTM) Breaking load Eccentricity Unit 6-1 6-2 6-3 6-4 6-7 6-7 6-12 6-12 6-15 6-15 6-19 6-19 6-22 6-22 6-27 6-27 6-31 6-31 6-37 6-37 6-43 6-55 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 43 55 d=15.3 mm Ap=140 mm2 d=15.7 mm Ap=150 mm2 d=15.24 mm Ap=140 mm2 d=15.24 mm Ap=140 mm2 [mm2] [mm2] [mm2] [kN] [kN] [kN] [mm] [mm] [mm] [mm] 140 280 420 560 700 840 980 1120 1260 1400 1540 1680 1820 1960 2100 2240 2380 2520 2660 2800 2940 3080 3220 3360 3500 3640 3780 3920 4060 4200 4340 4480 4620 4760 4900 5040 5180 6020 7700 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 1950 2100 2250 2400 2550 2700 2850 3000 3150 3300 3450 3600 3750 3900 4050 4200 4350 4500 4650 4800 4950 5100 5250 5400 5550 6450 8250 140 280 420 560 700 840 980 1120 1260 1400 1540 1680 1820 1960 2100 2240 2380 2520 2660 2800 2940 3080 3220 3360 3500 3640 3780 3920 4060 4200 4340 4480 4620 4760 4900 5040 5180 6020 7700 260 520 780 1040 1300 1560 1820 2080 2340 2600 2860 3120 3380 3640 3900 4160 4420 4680 4940 5200 5460 5720 5980 6240 6500 6760 7020 7280 7540 7800 8060 8320 8580 8840 9100 9360 9620 11180 14300 279 558 837 1116 1395 1674 1953 2232 2511 2790 3069 3348 3627 3906 4185 4464 4743 5022 5301 5580 5859 6138 6417 6696 6975 7254 7533 7812 8091 8370 8649 8928 9207 9486 9765 10044 10323 11997 15345 260.7 521 782 1043 1304 1564 1825 2086 2346 2607 2868 3128 3389 3650 3911 4171 4432 4693 4953 5214 5475 5735 5996 6257 6518 6778 7039 7300 7560 7821 8082 8342 8603 8864 9125 9385 9646 11210 14339 25/30 40/45 40/45 45/501 50/57 55/62 55/62 65/72 65/72 70/77 70/77 75/82 80/87 80/87 80/87 85/92 85/92 90/97 90/97 100/107 100/107 100/107 100/107 100/107 110/117 110/117 110/117 110/117 120/127 120/127 120/127 120/127 120/127 120/127 130/137 130/137 130137 140/147 160/167 9 11 11 11 13 11 10 12 11 13 12 17 16 15 14 13 18 17 16 15 21 20 19 18 17 16 22 21 20 21 26 22/25 76/252 76/252 76/252 58/63 58/63 58/63 76/81 76/81 76/81 76/81 76/81 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 100/106 115/121 115/121 115/121 115/121 115/121 130/136 130/136 130/136 130/136 130/136 130/136 130/136 130/136 130/136 130/136 150/157 150/157 13 11 18 16 15 13 12 25 24 23 22 20 19 18 17 16 15 22 22 21 21 20 27 27 26 25 24 23 22 22 21 20 27 21 [mm] 25.0 x 2.0 33.7 x 2.0/2.5/3.0 42.4 x 2.0/2.5/3.0 48.3 x 2.0/2.5/3.0 76.1 x 2.0/2.5/3.0 76.1 x 2.0/2.5/3.0 80.0 x 2.0/.2.5 80.0 x 2.0/.2.5 101.6 x 3.0/4.0/5.0 101.6 x 3.0/4.0/5.0 101.6 x 3.0/4.0/5.0 101.6 x 3.0/4.0/5.0 108.0 x 3.0/4.0 114.3 x 3.0/4.0/5.0 114.3 x 3.0/4.0/5.0 114.3 x 3.0/4.0/5.0 127.0 x 3.0/4.0/5.0 127.0 x 3.0/4.0/5.0 139.7 x 3.0/4.0 139.7 x 3.0/4.0 152.4 x 3.0/4.0/5.0 168.3 x 3.0/4.0 1) Flat ducts possible as well 2) Flat duct PT-PLUS® with rectangular slab anchorages, for PT-PLUS® see also under 3.1.3 3) If flat ducts (steel or PT PLUS®) to be used with square type castings please contact your VSL representative In plan view, tendons with slab type anchorages must be straight between anchorages or have only unidirectional turns with radii of > m Strands must always be pushed-in prior to concreting Eccentricity e: negligible 4) Given values may slightly vary depending on local availability of ducts They are minimal for most applications For special cases (long tendons, many curvatures, small radii etc.) greater size duct is recommended – please verify with VSL In any case the filling ratio (cross-section steel / duct) must not exceed 0.5 (EN523) 5) Please check with the nearest VSL office for the complete anchorage list V S L P O S T- T E N S I O N I N G S O L U T I O N S 21 Plaq PT:PT Brochure 15/01/10 11:17 Page22 - ANCHORAGES For the selection and the dimensions of the most commonly used anchorages, please consult the VSL data sheets on anchorages For spacing between anchorages and edge distance, refer to individual anchorage data sheet - DUCTING 3.1 TYPES 3.1.1 Bright corrugated steel ducts The most commonly used sheaths are made from rolled steel strip Round and flat (max strands are available) They are corrugated and leak-tight and must have sufficient strength to withstand varying degrees and types of mechanical loading For additional information and details, locally valid norms (or for example EN523) can be consulted PL3 (fib bulletin 33) These EIT tendons permit monitoring of the leak tightness of the tendon encapsulation and protection of the tendon over the entire design life of the structure recommended The PT-PLUS® system is particularly suitable for railroad brides, bridge decks, parking structures and other situations where severe corrosion or high fatigue loading may be expected In addition, the PT-PLUS® system with additional details at the anchorages allows to provide electrically isolated tendons (EIT) and a protection level of Round duct Coupler Half-shell 3.1.2 Galvanized corrugated steel ducts Galvanization is sometimes used to ensure corrosion protection of the metal strip It can provide lower friction losses when stressing the tendon Please check local code requirements Clamp Grout vent connection1 3.1.3 Corrugated PT-PLUS® duct system For enhanced corrosion protection and fatigue resistance of the tendons, use of the VSL PT-PLUS® corrugated plastic duct system is Couplers are available with/without grout vents for a threaded tube with dia 23 mm Dimensions for PT-PLUS® duct system Dimensions in mm, subject to modifications Tendon unit Nominal weight Type 0.5” 0.6” ØA ØB ØC D E ØF G H Duct kg/m Coupler kg/unit 22 59 76 100 115 130 150 5-1 5-12 5-19 5-31 5-37 5-43/55 6-1 6-7 6-12 6-19/22 6-27 6-31/37 6-55 22 58 76 100 115 130 150 25 63 81 106 121 136 157 31 73 91 116 131 146 167 1.5 2.5 2.5 3.0 3.0 3.0 3.5 55 42 52.5 60 60 52 60 27.52 82 100 123 138 153 175 802 108 116 126 127 134 126 27.52 106 124 147 162 177 198 0.180 0.480 0.620 0.980 1.120 1.200 1.620 0.010 0.200 0.250 0.270 0.320 0.380 0.420 One-piece sleeve coupler Flat duct Note: PT-PLUS® ducts come in lengths of approximately m, type 22 ducts are m long Coupler Seal Clip Sleeve Grout vent connection1 Dimensions in mm, subject to modifications 22 V S L P O S T- T E N S I O N I N G S O L U T I O N S Couplers are available with/without grout vents for a smooth tube with dia 16 / 20 mm Plaq PT:PT Brochure 15/01/10 11:17 Page23 The PT-PLUS® flat duct system and type 22 are often used for slab post-tensioning in buildings, for transversal tendons for bridges and for similar structures where the exploitation of a maximum tendon eccentricity in relatively thin members is important be used Ducts normally have a ratio of diameter / wall thickness of 16 to 18, with an internal diameter not smaller than 1.7 Ap (Ap = nominal cross section of the steel area in the tendon), suitable to carry internal pressure during grouting (ETAG013 (2002) e.g specifies MPa / 10 bar design pressure) The following dimensions of external tendon pipes are recommended (see table below) 3.1.4 Smooth plastic ducts Smooth plastic ducts are predominantly used for external tendons Occasionally they have been also used for internal tendons when no bonding steel / concrete is required They are normally made of UV resistant, new high density polyethylene (HDPE) material (virgin granulate) acc to EN12201 and ASTM D3035 or ASTM F714 or equivalent standards Material recycled from previously used PE components shall not Dimensions for steel pipes 3.1.5 Steel pipes In certain applications (e.g cryogenic, nuclear, offshore) where the ducts are subject to high loading when particularly tight tendon curvature is required, or when tendons are in congested parts of structures, steel pipes are used Tubes are thin (in compliance with EN or equivalent Dimensions for smooth plastic ducts Tendon size External pipe diameter (mm) strands bare PE sheathed Wall thickness (mm) strands bare PE sheathed 5-12 / 6-7 75 90 4.3 5.1 5-15/19 / 6-12 90 110 5.4 6.0 110 140 6.6 6.7 5-22/31 / 6-15/19 standards) and machine-bendable, (for recommended dimensions, see 1.2 / 1.4) Steel tubes used externally: dimensions are primarily dictated by the availability of local standardized tubes The table below can serve as a guideline and is based on an internal diameter of ≥ 1.7 Ap where Ap represents the cross section of the prestressing steel 5-37 / 6-22/27 110 160 6.6 7.7 5-43 / 6-31 140 160 8.3 7.7 5-55 / 6-37 160 180 9.5 8.6 Strand Nos Min inside dia for strands with 100 mm2 140 mm2 150 mm2 34 40.2 41.6 45 53.2 55.1 12 58.9 69.7 72.1 15 65.8 77.9 80.6 19 74.1 87.7 90.8 22 79.7 94.3 97.7 27 88.3 104.5 108.2 31 94.7 112.0 115.9 37 103.4 122.4 126.6 43 111.5 131.9 136.5 55 126.1 149.2 154.4 Dimensions in mm, subject to modifications Wall thickness e ≥ Ø / 50 or minimum 1.5 mm Ø = external diameter Where steel pipes need to be welded, e ≥ mm Dimensions in mm, subject to modifications 3.2 FRICTION COEFFICIENT AND LOSSES DUE TO PRESTRESSING 3.2.1 Friction coefficient The following values may be assumed when using the equation Px = Po e -(µφx + kx) : Equation of loss of post-tensioning force along a tendon φx = Accumulated tendon deviation Px = Remaining force at distance x from the stressing end from the stressing end k = Wobble coefficient Po = Stressing force at the stressing end x = Distance from the stressing end µ = Friction coefficient Range Recommended value Corrugated steel sheath µ = 0.16 - 0.24 k = (0.6 - 1.0) x 10-3 m-1 µ = 0.20 k = 0.8 x 10-3 m-1 PT-PLUSđ plastic duct = 0.12 - 0.14 k = (0.8 - 1.2) x 10-3 m-1 µ = 0.14 k = 1.0 x 10-3 m-1 µ = 0.20 - 0.30 k = refer to below µ = 0.25 k = refer to below µ = 0.12 - 0.15 µ = 0.02 - 0.08 k = refer to below µ = 0.14 µ = 0.06 k = refer to below µ = 0.04 - 0.07 k = (0.4 - 0.6) x 10-3 m-1 µ = 0.05 k = 0.5 x 10-3 m-1 Steel pipes incl saddles for external tendons: with clean dry or lubricated strands1 Saddles for external tendons with internal HDPE tube over saddle: - bare strands - greased and plastic sheathed monostrands Greased and plastic sheathed monostrands 3.2.2 Draw-in of wedge at lock-off: max mm This value is independent of the jack or tendon type If necessary, e.g for short tendons, compensation can be provided by appropriate procedures 3.2.3 Other tendon force losses In addition to friction and relaxation losses (see above), also concrete shrinkage and creep as well as a draw-in of the wedge during lock-off must be considered To calculate losses due to concrete shrinkage and creep, reference should be made to the technical documents and standards applicable to each project µ-values depend on lubrication The wobble factor can normally be neglected V S L P O S T- T E N S I O N I N G S O L U T I O N S 23 Plaq PT:PT Brochure 15/01/10 11:17 Page24 3.3 DUCT SPACING AND COVER The cable layout patterns are dictated by the designer When detailing that cable layout, it is absolutely essential to consider the spacing of cables from another, required cover, and radii of curvature Usually the spacing and curvatures are laid down in standards, guidelines or national approvals If not available, VSL recommends that the following guidance values be observed, these being minimum values: Minimum spacing and cover of duct Measurement (a) • Precast elements, elements protected from bad weather, soft environmental conditions • In general • Severe environmental conditions 3.4 SPACING OF THE SUPPORTS AND TOLERANCES The spacing of the supports underneath the steel and plastic ducts must be 10 to 12 times the internal diameter of the duct Kinks are not permitted 30 40 50 SPACING b1, c1 = 0.7 times diameter of the duct b2, c2 = 1.0 times diameter of the duct The fastening fittings must be sufficiently robust and close enough so that the ducts and tendons will not exhibit displacements or deformations in excess of the allowed tolerances For tolerances on cable positions reference should be made to applicable standards and recommendations In determining minimum spacings and concrete cover requirements for ducts, reference should be made to applicable standards and recommendations, see 3.3 Standard steel duct VSL Protection shells are recommended to be fixed on the duct at tendon supports for tendon radii R < Rmin (see under 4.2), and where ducts risk to be dented by closely placed rebars PT-PLUS® plastic duct with protection shell 24 V S L P O S T- T E N S I O N I N G S O L U T I O N S Moreover, under all circumstances and in every direction, whenever a cable displays or potentially displays deviation in the vicinity of an edge of concrete which could lead to spalling of concrete cover, an offset with respect to the theoretical axis is only tolerated provided that equilibrium reinforcing bars have been provided over this zone Plaq PT:PT Brochure 15/01/10 11:18 Page25 3.5 SADDLES FOR EXTERNAL TENDON 3.5.1 Saddles Various solutions are used in practice In most cases, saddles consist of a pre-bent steel tube cast into the surrounding concrete or attached to a steel structure by stiffening plates The connection between the free tendon length and the saddle must be carefully detailed in order not to damage the prestressing steel by sharp angular deviations during stressing and in service It is also important that the protective sheath be properly joined If tendon replacement is a design requirement, the saddle arrangement must be chosen accordingly 3.5.2 Various saddle arrangements 3.5.3 Minimum radius of tendon curvature for external tendons Tendon unit 0.5” 0.6” Minimum radius up to - 12 6-7 2.00 m up to - 19 - 12 2.50 m up to - 31 - 22 3.00 m up to - 43 - 31 3.50 m up to - 55 - 37 4.00 m up to - 43 4.50 m up to - 55 5.00 m - The values are equivalent to approximately Rmin (m) = (1.5 to 1.3) Fpk [MN] ≥ 2.0 m - They apply to smooth steel and HDPE pipe and assume a straight length on either side of the deviation PE pipe through bell-mouth deviator, from anchorage to anchorage (most common detail) PE pipe through deviator pipe, from anchorage to anchorage Diabolo bell-mouth for deviation points at diaphragm segment Deviation pipe protrudes from concrete at sufficient distance and is coupled to PE pipe - DESIGN REQUIREMENTS 4.1 ANCHORAGE ZONE REINFORCEMENT The transfer of the prestressing forces from the anchorage into the concrete produces stresses which exceed the concrete strength and that must be withstood by special reinforcement A distinction may be made between three types of reinforcement a) Local zone reinforcement in the immediate vicinity of the anchorage For this purpose, spirals (helices) or appropriate orthogonal reinforcement are normally used This reinforcement is considered as an integral component of the anchorage and its design lies within the field of responsibility of VSL This reinforcement is specified in approvals and it may only be changed upon approval by VSL The Anchorage data sheets show the required reinforcement for each anchorage 4.2 MINIMUM RADIUS OF TENDON CURVATURE AND TANGENT LENGTH FOR INTERNAL TENDONS Minimum radius of tendon curvature Minimum tangent length b) General zone of reinforcement for resisting the spreading of forces in the structure This reinforcement is designed by the project designer Guidelines for its design can be found in VSL’s report “Detailing for post-tensioning” c) Reinforcement for spalling forces near stress free edges This reinforcement is designed by the project designer as part of the overall reinforcement of the structure Rmin (m) = 3.0 x Fpk [MN] ≥ 2.5 m Lmin = 0.8 m for Fpk ≤ MN = 1.0 m for Fpk ≥ MN, ≤ MN = 1.5 m for Fpk ≥ MN Rmin (m) = 2.50 m for unbonded tendons for 5-1 and 6-1 V S L P O S T- T E N S I O N I N G S O L U T I O N S 25 Plaq PT:PT Brochure 15/01/10 11:18 Page26 - INSTALLATION 5.1 ANCHORAGES It is a requirement that the bearing plate / casting of anchorages are fixed perpendicular to the tendon axis The block-out dimensions and clearance requirement as given under 5.3 should be followed Departures from these data may be possible Please contact VSL 5.2 GROUT VENTS Low point drains should only be foreseen where there is a risk of water freezing inside the duct and hence, drainage is required As a general rule distance between grout vents should not exceed 100 m They should have a range of spacing between vents in the order of 30 – 70 m 5.3 BLOCK-OUT DIMENSIONS AND CLEARANCE REQUIREMENTS B Jack type ZPE-23FJ ZPE-30 ZPE-3 ZPE-60 ZPE-7/A ZPE-12/St2 ZPE-185* ZPE-200 ZPE-19 ZPE-460/31 ZPE-500 ZPE-580* ZPE-750 ZPE-980* ZPE-1000 ZPE-1250 ZPE-1450* ° -60 A A 45° Concrete cover according to applicable standard B * A – 30 30 30 30 50 50 50 50 60 80 80 80 80 80 90 90 B 300-360 600 500 650 650 520 620 950 700 560 950 860 1,200 950 1,200 1,300 1,010 C 1,200 1,350 1,000 1,250 1,400 1,100 1,220 2,000 1,500 1,300 2,000 1,620 2,400 1,760 2,400 2,550 1,850 Jack is designed to be used for 310kN UTS strands stressed to max 85% of the 310kN E D C 26 V S L P O S T- T E N S I O N I N G S O L U T I O N S E D 116 140 200 180 300 310 300 330 390 485 585 500 570 650 790 710 770 E 90 100 150 140 200 200 180 210 250 300 330 280 365 360 450 375 420 Dimensions in mm Plaq PT:PT Brochure 15/01/10 11:18 Page27 5.4 STRESSING JACK DATA Type I (ZPE-23FJ) Type II (ZPE-460/31) Designation ZPE-23FJ Type ZPE-3 ZPE-60 ZPE-7/A ZPE-12/St2 ZPE-185* ZPE-200 ZPE-19 I II III III III II II III II Length (mm) 830 720 475 615 700 610 600 1,170 730 Diameter (mm) 116 140 200 180 280 310 295 315 390 200 250 160 250 160 100 100 300 100 47.10 58.32 103.6 126.4 203.6 309.4 309.3 325.7 500.3 230 488 320 549 500 483 632 500 1,064 523 1,850 600 1,856 600 2,000 614 2,900 580 Stroke (mm) Piston area (cm ) Capacity (kN) (bar) Weight (kg) 23 28 47 74 140 151 120 305 294 Used for 13mm/ 0.5” tendon types 5-1 5-1 5-2 5-3 5-2 to 5-4 5-6 5-7 5-12 5-7 5-12 5-19 5-18 Used for 15mm/ 0.6” tendon types 6-1 6-2 6-2 6-2 6-3 6-4 6-6 6-7 6-3 6-4 6-7 6-6 6-7 6-12 ZPE-460 ZPE-500 ZPE-580* ZPE-750 II III II II II III II II Length (mm) 580 1,000 760 1,185 810 1,150 1,290 840 Diameter (mm) 485 550 500 520 645 790 620 765 Stroke (mm) 100 200 150 150 150 200 150 150 Piston area (cm ) 804.0 894.6 961.7 1,247.0 1,652.3 1,809.5 2,168.0 2,436.9 Capacity (kN) (bar) 4,660 580 5,000 559 5,805 610 7,500 601 9,750 590 10,000 553 12,500 577 14,500 595 Weight (kg) 435 1,064 460 1,100 800 2,340 1,730 1,250 Used for 13mm/ 0.5” tendon types 5-22 5-31 5-22 5-31 5-12 to 5-31 5-31 to 5-55 5-37 to 5-55 5-37 Used for 15mm/ 0.6” tendon types 6-18 6-19 6-18 to 6-22 6-12 6-19 6-22 6-31 to 6-43 6-31 to 6-37 6-43 to 6-55 Designation Type * ZPE-30 Type III (ZPE-1000) ZPE-980* ZPE-1000 ZPE-1250 ZPE-1450* 6-27 6-31 6-37 6-43 6-48 6-55 Jack is designed to be used for 310kN UTS strands stressed to max 85% of the 310kN V S L P O S T- T E N S I O N I N G S O L U T I O N S 27 Plaq PT:PT Brochure 15/01/10 11:18 Page28 VSL LOCATIONS www.vsl.com Middle East / Africa / UNITED ARAB EMIRATES VSL Middle East LLC DUBAI, UAE Phone: +971 885 7225 Fax: +971 885 7226 EGYPT ARGENTINA VSL Sistemas Especiales de Construcción Argentina SA BUENOS AIRES Phone: +54 11 4326 06 09 Fax: +54 11 4326 26 50 BOLIVIA Postensados de Bolivia SAN MIGUEL, LA PAZ Phone: +591 27 70 338 Fax: +591 27 96 183 CHILE VSL Sistemas Especiales de Construcción S.A SANTIAGO Phone: +56 571 67 00 Fax: +56 571 67 01 COLOMBIA Sistemas Especiales de Construcción S.A.S BOGOTA Phone: +57 226 62 30 Fax: +57 271 50 65 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+84 3976 5088 Fax: +84 3976 5089 INDONESIA HO CHI MINH CITY Phone: +84 810 6817 Fax: +84 810 6818 PT VSL Indonesia JAKARTA Phone: +62 21 570 07 86 Fax: +62 21 573 75 57 JAPAN Australia / VSL Japan Corporation TOKYO Phone: +81 3346 8913 Fax: +81 3345 9153 VSL Australia Pty Ltd KOREA QUEENSLAND Phone: +61 3265 64 00 Fax: +61 3265 75 34 VSL Korea Co Ltd SEOUL Phone: +82 553 8200 Fax: +82 553 8255 MALAYSIA VSL Engineers (M) Sdn Bhd KUALA LUMPUR Phone: +603 7981 47 42 Fax: +603 7981 84 22 NEW SOUTH WALES Phone: +61 9484 5944 Fax: +61 9875 3894 VICTORIA Phone: +61 979 503 66 Fax: +61 979 505 47 SOUTH AUSTRALIA Phone: +61 8354 4884 Fax: +61 8354 4883 TASMANIA Phone: +61 6225 3567 Fax: +61 6225 2226 PERTH Phone/Fax: +61 9523 4686 Copyright 2010, VSL International Ltd Printed in France – patented Printed on paper from sustainably managed forests The information set forth in this brochure including technical and engineering data is presented for general information only While every effort has been made to insure its accuracy, this information should not be used or relied upon for any specific application without independent professional examination and verification of its accuracy , suitability and applicability Anyone using this material assumes any and all liability resulting from such use VSL disclaims any and all express or implied warranties of merchantability fitness for any general or particular purpose or freedom from infringement of any patent, trademark, or copyright in regard to the information or products contained or referred to herein Nothing herein contained shall be construed as granting a license, express or implied under any patents ... techniques to provide Electrically Isolated Tendons (refer to GC system in VSL International Technical Catalogue) These tendons may be electrically monitored at any time throughout the life of the structure