Post-Tensioning Systems
OVM Technologies

Post-Tensioning Systems

As one of the earliest post-tensioning systems in China, OVM has extensive experience in prestressing technology, and the reliability of the OVM system is extensively acknowledged worldwide. The system is applied from bridges, buildings and geotechnical engineering through to nuclear power plants, water conservancy and hydropower facilities, and renewable energy projects.

Key Features

Why specify OVM post-tensioning systems

  • Matched strands in every common diameter — 12.5 / 12.7 / 12.9 mm, 15.24 / 15.7 mm, 21.8 mm and 28.6 mm.
  • Adaptable to strand of 1,860 MPa through to 2,400 MPa tensile strength.
  • Full range of tendon sizes: 1 to 55 strands, with larger and custom sizes available on request.
  • High anchoring coefficient — reliable and stable under high, low and negative stress conditions.
  • A complete range of identical accessories available against particular project requirements.
  • Backed by OVM's own equipment for installation, tensioning and grouting.
Types

Systems we supply

Bonded post-tensioning system

Uses steel strands or bars encased in ducts, later filled with grout to provide full bond.

Unbonded post-tensioning system

Each tendon is coated with grease and encased in plastic sheathing, allowing independent movement within the concrete.

External post-tensioning system

Tendons run outside the concrete structure, allowing easy inspection, maintenance, and replacement.

Pre-tensioning system

Strands or bars are tensioned before concrete casting and bonded directly into the structure.

Stress bar system

High-strength post-tensioning bars used for structural reinforcement and stability.

Post-Tensioning Systems — OVM project photography
Post-Tensioning Systems — OVM project photography
Product Range

The systems in detail

Each OVM post-tensioning systems variant, with its published features and the labelled components of its assembly.

01

OVM Multistrand Post-Tensioning

The core system: anchorage (stressing-end and dead-end), coupler, strand and duct, assembled as one tendon. Tendons can be stressed at one or both ends as the design requires.

Integral assembly — stressing end

  1. 01Tool anchorage
  2. 02Jack
  3. 03Spacer
  4. 04Wedge
  5. 05Anchor head
  6. 06Spiral reinforcement
  7. 07Strand
  8. 08Bearing plate

Complete tendon layout

  1. 01Grouting tube
  2. 02Duct
  3. 03Vent
  4. 04Coupler
  5. 05Dead-end anchorage type P (alternatively)
  6. 06Anchor plate
  7. 07Grouting / drainage
  8. 08Stressing-end anchorage

Stressing-end Anchorage OVM.M13TA

  1. 01Wedge
  2. 02Anchor head
  3. 03Bearing plate
  4. 04Spiral reinforcement
  5. 05Strand
  6. 06Duct
  • Applicable only to strands with Ap = 98.7 mm² or Ap = 100 mm².
  • Applicable to concrete strength of 40/50 MPa (fc,cylinder / fc,cube) or above.
  • At 32/40 MPa, mesh reinforcement must be added. Contact OVM for other working conditions.

Dead-end Anchorage Type P — OVM.P15 / P13

  1. 01Duct
  2. 02Restraining ring
  3. 03Vent
  4. 04Spiral reinforcement
  5. 05Strand
  6. 06Anchor plate
  7. 07Swaged end
  • The swaged end is formed by a GYJC50-150 swaging machine, which plastically deforms a swage socket lined with a swage spring to grip the strand.
  • Tension load transfers directly to the concrete through bond and the anchor plate.
  • OVM.P15 suits Ap = 140 / 150 mm²; OVM.P13 suits Ap = 98.7 / 100 mm².

Dead-end Anchorage Type H — OVM.H15 / H13

  1. 01Duct
  2. 02Restraining ring
  3. 03Vent
  4. 04Spiral reinforcement
  5. 05Spacer
  6. 06Bulb
  • The most convenient fixed-end solution for on-site operation: force transfers partly by bond and partly through a bulb formed by the YH3 bulb machine.
  • OVM.H15 suits Ap = 140 / 150 mm²; OVM.H13 suits Ap = 98.7 / 100 mm².

Dead-end Anchorage Type PT — OVM.M15A-nPT

  1. 01Bolt 1
  2. 02Plate
  3. 03Swaged end
  4. 04Spring
  5. 05Anchor head
  6. 06Bolt 2
  7. 07Bearing plate
  8. 08Spiral reinforcement
  9. 09Duct
  10. 10Strand
  • Applicable to strands with Ap = 140 mm² or Ap = 150 mm².
  • Applicable to concrete strength of 32/40 MPa (fc,cylinder / fc,cube) or above.

Dead-end Anchorage Type KP — OVM.M15A-nKP

  1. 01Spiral reinforcement
  2. 02Bearing plate
  3. 03Anchor head
  4. 04Wedge
  5. 05Spring
  6. 06Plate 1
  7. 07Bolt 1
  8. 08Bolt 2
  9. 09Plate 2
  • Applicable to strands with Ap = 140 mm² or Ap = 150 mm².
  • Applicable to concrete strength of 32/40 MPa (fc,cylinder / fc,cube) or above.

Coupler OVM.L15 / L13

  1. 01Duct
  2. 02Spiral reinforcement
  3. 03Bearing plate
  4. 04Coupler block
  5. 05Swaged end
  6. 06Protective cover I
  7. 07Bolt
  8. 08Nut
  9. 09Restraining ring
  10. 10Strand
  11. 11Protective cover II
  12. 12Wedge
  • Couplers elongate tendons that, because of length or construction method, cannot be installed or tensioned in one unit.
  • OVM.L15 suits Ap = 140 / 150 mm²; OVM.L13 suits Ap = 98.7 / 100 mm².

Mono-Strand Coupler — OVM15L-F / 13L-F

  1. 01Spiral reinforcement
  2. 02Bearing plate
  3. 03Anchor head
  4. 04Wedge
  5. 05Mono-strand coupler
  6. 06Protective sleeve
  7. 07Plate
  8. 08Restraining ring
  • Connects and elongates single strands: n mono-couplers set in parallel inside one protective sleeve.
  • OVM15L-F suits Ap = 140 / 150 mm²; OVM13L-F suits Ap = 98.7 / 100 mm².
02

OVM Slab Post-Tensioning

Flat anchorages for post-tensioned slabs, where the shallow depth of the member rules out a circular anchor head. Flat steel duct carries the strand group.

Stressing-end Slab Anchorage OVM.BM15/13

  1. 01Wedge
  2. 02Slab anchor head
  3. 03Slab bearing plate
  4. 04Spiral reinforcement
  5. 05Steel flat duct
  6. 06Strand

Stressing-end Anchorage OVM.BM15TA

  1. 01Wedge
  2. 02Slab anchor head
  3. 03Slab bearing plate
  4. 04Strand
  5. 05Spiral reinforcement
  6. 06Steel flat duct

Stressing-end Anchorage OVM.BM13C

  1. 01Wedge
  2. 02Slab anchor head
  3. 03Slab bearing plate
  4. 04Strand
  5. 05Duct
  6. 06Spiral reinforcement

Dead-end Slab Anchorage Type BP

  1. 01Swaged end
  2. 02P-bearing plate
  3. 03Spiral reinforcement
  4. 04Vent
  5. 05Restraining ring
  6. 06Flat duct
  7. 07Strand

Dead-end Slab Anchorage Type BH

  1. 01Flat duct
  2. 02Spiral reinforcement
  3. 03Restraining ring
  4. 04Vent
  5. 05Strand
  6. 06Spacer
  7. 07Bulb

Coupler of Slab Anchorage Type BL

03

OVM Special Post-Tensioning

Ring anchoring, nuclear containment and cryogenic LNG systems — the anchorages OVM developed where a standard linear tendon will not serve.

  • Ring Anchoring System OVM.HM applies prestress to circular structures: both the stressing end and the dead end of the ring tendon combine at one anchor head, which doubles as the coupler.
  • HM15A fully leak-tight ring anchorage uses a double axial extrusion seal and a radial seal to give every strand its own independent anti-corrosion structure — no leakage after 96 hours immersed under 3 m of hydrostatic head.
  • Friction loss is lower than bonded prestressing, and construction efficiency is higher, shortening the programme.
  • Nuclear PT system suits third-generation containment, with a full set of dedicated nuclear tensioning jacks and duct forming plant — pipe expanding, bending and making machines.
  • Cryogenic LNG anchorage performs stably at −196 °C, with a reduced strand deviation angle that lowers local stress concentration. Typical hole counts: 12, 15, 19, 22, 27 and 31.

Applications

Round PC storage tanks — silos, liquid gas tanks and sewage treatment tanksPC containment of nuclear reactorsPC hydrodynamic tunnels and wellsLNG storage tanks operating at cryogenic temperatureOther similar round prestressed concrete structures

Ring Anchoring System HM15 (bonded)

  1. 01HM anchor head
  2. 02Wedge
  3. 03Spacer
  4. 04Deviator A
  5. 05Deviator B
  6. 06Transfer block
  7. 07Stretch tube
  8. 08Stressing jack
  9. 09Strand
  10. 10Tool anchor head
  11. 11Tool wedge

Nuclear power plant post-tensioning anchorage

  1. 01Grouting cap
  2. 02Strand
  3. 03Wedge
  4. 04Anchor head
  5. 05Bearing plate
  6. 06Grouting connector
04

OVM External Prestressing System

Tendons carried outside the concrete section, where inspection, maintenance and replacement matter as much as the prestress itself.

  • Durable, with excellent anti-corrosive and anti-fatigue properties; a damping device can be fitted to reduce tendon vibration.
  • Easy to inspect and maintain, and fully replaceable over the life of the structure.
  • The individual strand deviator reduces stress concentration through the deviation zone.

Basic components

  1. 01External cables, ducts and grouting materials
  2. 02Anchorage system
  3. 03Deviating device
  4. 04Anti-corrosion system
  5. 05Damping device
05

Electrical Isolation PT System — PL2 / PL3

Protection-level tendons for aggressive environments, where the tendon must be electrically isolated from the structure and testable over its service life.

  • Meets EAD 160004, GB/T 14370, fib and ASTRA 12 010.
  • Strong anti-corrosion capability across PL2 and PL3 protection levels.
  • Extends the effective service life of the prestressed structure.
Technical Reference

How the system fits together

Assembly drawings and cross-sections from the OVM post-tensioning systems engineering documentation.

Segment Launching Gantry — OVM Post-Tensioning Systems technical drawing

Segment Launching Gantry

Cable Tightening Machine — OVM Post-Tensioning Systems technical drawing

Cable Tightening Machine

Girder Lifting Gantry — OVM Post-Tensioning Systems technical drawing

Girder Lifting Gantry

System Supply

Components we supply

The individual parts that make up a complete post-tensioning systems installation.

OVM Post-Tensioning System — OVM Post-Tensioning Systems01

OVM Post-Tensioning System

The complete assembly — anchorage, strand, and duct working as one system.

Jack Type YCW — OVM Post-Tensioning Systems02

Jack Type YCW

Anchor Head Assembly — OVM Post-Tensioning Systems03

Anchor Head Assembly

Complete Tendon System — OVM Post-Tensioning Systems04

Complete Tendon System

Hydraulic Pump Unit — OVM Post-Tensioning Systems05

Hydraulic Pump Unit

Compact Pump Unit — OVM Post-Tensioning Systems06

Compact Pump Unit

Equipment & Service

Plant for installation, stressing and grouting

Jacks, pumps, swaging and grouting equipment supplied and supported by OVM alongside the system itself.

Mono-jack YDC

Single-strand stressing jack.

Hydraulic Jack YCW

Multi-strand through-centre stressing jack.

Built-in Jack YDCN

Hollow Piston Jack YC (L)

Hydraulic Pump

ZB4-500, ZB10/320-4/800B, ZB2-500AZ and ZPB-505B/175B units.

Bulb Machine YH3B

Forms the bulb for Type H dead-end anchorages.

Swaging Machine GYJC50-150

Forms the swaged end for Type P anchorages and couplers.

Heading Machine

Intelligent Grouting System LGSTC-700B

Integrated Mix and Grouting Machine GS300

High Speed Mixer JC500

Screw Pump LGB3

Mortar Pump UB3

Vacuum Pump ZKB

Smart Prestressing Tensioning System (OVM-SPT)

Records force and elongation automatically across the stressing sequence.

Standards & Compliance

Designed, tested and certified against

OVM post-tensioning systems comply with the specifications and recommendations below.

AASHTO

American Association of State Highway and Transportation Officials

ASTM

American Society for Testing and Materials

BS

British Standards

EAD 160004-00-0301

Post-tensioning kits for prestressing of structures

ETAG 013

Guideline for European Technical Approval of post-tensioning kits

FIP / fib

Fédération Internationale du Béton recommendations

GB/T 14370

Anchorage, grip and coupler for prestressing tendons

JIS

Japanese Industrial Standards

PTI

Post-Tensioning Institute specifications

Standards We Wrote

Standards OVM helped draft

OVM sits on the drafting committee for the national and industry standards that govern this system.

GB/T 14370-2015

National standard — Anchorages, grips and couplers for prestressing tendons

JT/T 329-2010

Industry standard — Anchorages, grips and couplers for prestressed steel strands of highway bridges

JGJ 85-2010

Industry standard — Technical specification for application of anchorages, grips and couplers for prestressing tendons

Certification

Approvals and test reports

  • Guangxi Famous Brand Product Certificate — OVM Post-Tensioning System products
  • Award Certificate — The Wedge Type Multi-Anchor Stayed Cable System and its installation method
  • Science and Technology Achievement Appraisal Certificate — OVM Post-Tensioning System
  • Anchor System Certification
  • Manufacturing Single Champion Demonstration Enterprise
Track Record

Reference Projects

Malaysian projects carrying OVM post-tensioning systems.

Next step

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