GJ Prefabricated Strand Cable System

OVM leads the Chinese prestressing industry

Thanks to 50 years of experience, OVM is now a leading prodouct supplier and specialist contractor inChina in the field of prestressing and other special construction techniques.With a strong reputation forreliability, professionalism and innovation, OVM systems have successfully worked on numerous projectsincluding bridges, highways, high-speed railwavs, buildings, dams, nuclear power plants, and in doing so haveachieved worldwide acknowledgement.

1. Structure of Completed Strand Cable

Epoxy-coated strand, galvanized strand and bare strand can be used for cable.

OVM Brief

1.Reliable anchoring and fatigue performance

Strands of the cable are integrally swaged and anchored at two ends, ensuring a reliable cable system with good fatigue performance. The strands will not slide under high stress, low stress, or even negative stress condition.

2.Compact structure and easy installation

The anchorage of the system is significantly compact, which is beneficial to the optimization and aesthetics of the structure. Swaging anchorage is at least 30% smaller than that of cold-casting and hot-casting anchorage with same load capacity, therefore the dimension of reserved holes in structures can be reduced accordingly.

3.Excellent anti-corrosion and anti-vibration performance

The cable can be customized according to different load requirements. Each strand is individuallygreased, PE sheathed and isolated, then strands bundle will be taped with high strength polyester beltand apply hot-extruded HDPE onto the bundle in the end, which forms triple anti-corrosion protectinglayers of the cable. Rust on one wire will not spread thus to protect the whole cable. As strands areisolated by individual PE sheath, the structure damping is bigger than that of steel wire cable, achievingexcellent anti-vibration performance. Special technique also applied to reduce the tensile stress on HDPEouter layer of cable, preventing stress cracking so as to improve its durability.

Main Features

OVM GJ Prefabricated Strand Cable System

The reliability, durability and adaptability of the structural cables for buildings and bridges are crucial tothe safety and service life of the structures. In order to provide reliable structural cables to the clients, OVMtook its advantages in the field of prestressing systems, had developed proprietary GJ prefabricated strandcable system with integral swaging anchorage. The whole bundle strands of the cable are swaged together,the system featuring reliable anchoring performance, compact structure, easy stressing and adjustment, aswell as outstanding anti-corrosion property, which makes it preferable to cable-stayed bridges.

Applicable Standards

1. Static load performance conforms to standard GB/T 14370-2007 Anchorage, Grip and Coupler for Prestressing Tendons

2. Fatigue load performance conforms to standards PT-2007 Recommendations for Stay Cable Design Testing and installation and FlB-Acceptance ofStay Cable Systems Using Prestressing Steels

3. HDPE material used for cable conforms to standards GB/T 18365-2001 Technical conditions for Hot-extruding PE Protection High Strength Wire Cable of Cable-stayed Bridge and C)/T297-2008 High Density Polyethylene Sheathing Compounds for Bridge Cable

4. PC Strand is with tensile strength of 1860MPa, and conforms to standard ASTM A416 Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete and GB/T 5224-2003 Steel Strand for Prestressed Concrete

5. Characteristic of epoxy-coated strand conforms to standard GB/T25823-2010 Individual Epoxy-coated Wire Prestressing Steel Strand

Main Structure

OVM GJ prefabricated strand cable system with integral swaging anchorage with Integral Swaging Anchorage comprises of pylon end integral swaging anchorage, completed strand cable and girder end integral swaging anchorage.Which end be chose as the stressing end should be decided by actual site situation. For long cable, both end of anchorage can be stressed end together.

Technical Parameters of Completed Strand Cable

Note: The above technical parameters are for strand cables made of strand with Dia.15.24mm and tensile strength of 1860Mpa.

2.Structure of Pylon End Integral swaging Anchorage

1.Cap
2.Integral Swaging Anchorage

3.Spherical Nut

4.Spherical Bearing Plate

5.Bearing Plate

6.Pre-embedded Tube

7.Upper Damper

8.Baffler

9.Completed Strand Cable

3.Structure of Girder End Integral Swaging Anchorage

1.Cap
2.Integral Swaging Anchorage

3.Spherical Nut

4.Spherical Bearing Plate

5.Bearing Plate

6.Pre-embedded Tube

7.Lower Damper

8.Water-proof Cover

9.Completed Strand Cable

4 .Technical Parameters of Integral swaging Anchorage

Equipments & Required Space for Stressing

Construction Procedures

1.Remove the packing material on both ends of anchorage, check the thread of anchorage andcheck if the nut can be screwed on smoothly. The packing material on cable can be removed after completing the construction.

2.Screw out the nuts of anchorage on both ends

3. Weld the plate of protective cap to the pre-embedded plate,and assure center hole of two plates on a same center line.

4. Put down the hauling cable of lifting machine through the reserve tube,spherical plate and nut ofcable. The hauling cable should be with lifting bolt which can be connected with the anchor head of cable.

5. Connect the lifting bolt with anchor head of cable, lift the anchor head out from pre-embeddedplate on the pylon end, continuous lifting until bottom anchorage be pulled into reserved tube, and thenscrew the fixed-end nut of pylon end on.
6.Adjust the fixed-end anchorage position according to actual situation

7. Repeat step 1-6 for the next cable
8. Set up the construction platform, stress and adjust the cable according to designed requirementsof stressing sequence and force controlled.
9.Stressing to the design force, screw the nut on stressing end tightly and remove the stressingequipments

Tests

Static Load Test

Applications