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PC Wire and Strand MachinesPC Wire and Strand Machines

LINE FOR TREATMENT OF LOW RELAXATION STEEL WIRE FOR PRESTRESSED CONCRETE AND STRUCTURAL REINFORCEMENT

High carbon steel wire is used as structural reinforcement in a wide field of applications such as big industrial and civil engineering works (beams and structures of multi-storey buildings, pillars, bridges, structures, docks, highway barriers, rail sleepers for high speed trains, concrete pipes, huge suspension cables for cable-stayed bridges, etc.). To fulfil efficiently the features of load and reinforcement this steel wire must have characteristics of LOW RELAXATION when it undergoes the continuous application of high axial loads (especially if combined with concrete). To produce such type of wire a tension relief treatment is necessary, obtained by placing the wire under a load equivalent to 40 % of its tensile while being heated to a temperature of approx. 400 C with further quick cooling.

PC Wire and Strand Machine

Steel ropes made of high carbon wires mainly in assembly with 2, 3 and 7 wires (1+6 ), but today also in assembly with 19 wires (1+6+12) are more and more frequently used as structural reinforcement in a wide field of applications where it is needed to bear very heavy and continuous loads.

To minimize elongation under continuous load a tension relief treatment is necessary.

PC Wire and Strand Machine
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Key benefits

The treatment lines for PC Wire and PC Strand offered by Eurolls guarantee a technological process with very high performance and excellent quality, as a result of great technical knowledge and long experience in this field.

PC Wire and Strand Machines
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Specifications

MAIN SPECIFICATION AND TECHNICAL DATA LINE FOR PRESTRESSED CONCRETE WIRE:

Material:

Wire diameter range: 3 - 12 mm

Diameter tolerance: ± 0,05 mm

Tensile strength: 1620 - 2100 N/mm2

Wire surface type: Smooth, Indented, Galvanized

Packaging: Strapped coils

Internal diameter > 1220 mm

Welded joints: Not accepted

 

Line:

Working speed: Up to 500 m/min

Wire pay-off: From motorized spool 2000 - 5000 kg

Tensioning system: by Rotating Die or by Double Capstan

Straightening: Quadruple straightener on 4 planes at 45°

Indenting: By cassette with 2 or 3 rolls, adjustable Heating furnace type: Induction with power between 150 and 600 kW

Wire cooling: By dip and spray in tunnel Pulling capstan: Double with vertical/horizontal axis with V shape groove

Capstan diameter: 3000 - 5000 mm

Wire pusher: 4 pairs of gummed rolls hydraulically openable

Cutting to length system: Rotating shear

Collecting baskets (2): With vertical axis Ø 3000 mm weight max. 2000 kg

 

MAIN SPECIFICATION AND TECHNCIAL DATA LINE FOR PRESTRESSED CONCRETE ROPE

Production: Assembly: 1 + 6 (+12 with Tubular in tandem)

Wire diameter range: 2,12 mm - 8,50 mm

Wire diameter tolerances: ± 0,02 mm - ± 0,05 mm

Rope diameter range: 6,35 mm (1/4 inch) - 25,4 mm (1 inch)

Tensile strength: 1620 - 2100 N/mm2

Welded joints: Not allowed

Wire surface type: Smooth, Galvanized, PVC coated, Epoxy impregnated

Rope surface type: Normal or compacted with die (optional)

Packaging: Precision wound coils with strap (every 45°)

Internal diameter 800 mm

External diameter 1300 - 1500 mm

Width 750 mm

Net weight 5000 kg max

PC Wire and Strand Machines

Stranding and relaxation line:

Production speed: Up to 170 m/min

Max productivity: 11000 kg/h

Type of strander: Skip 1+6

Wire pay-off spools:

Flange 900 - 1250 mm

Net weight 1300 - 3000 kg

Post forming: Double wire straightener on 2 planes at 90°

Tensioning system: by two groups of Double Capstans

First Group pulling Capstans:

Type: Double multi-gorge with horizontal axis

Capstan diameter: 1500 - 2500 mm

Max continuous pull: 28000 kg

Pull control: Load cell on diam. 1200 mm pulley, deflection angle 7°

Heating furnace type: Induction with power between 450 and 900 kW

Working temperature: 380 - 420 °C

Wire cooling: Two stages, fist by immersion and second by spray, with temperature control at exit

 

Second Group pulling Capstans:

Synchronization system: Guiding rolls group with linear vertical scroll bar, with constant pull max 500 kg

Type: Double multi-gorge with horizontal axis

Capstan diameter: 1500 - 2500 mm

Max continuous pull: 28000 kg

Strand packaging: Double spool Winding-Unwinding system movable on rails.

Max capacity 28000 kg

 

Respooling and packaging:

Working speed: Up to 400 m/min

Synchronization system: Guiding rolls group with linear vertical scroll bar, with constant pull max 750 kg

Coil preparation: Precision winding spooler (lay on lay) with automatic flange opening and coil extraction/unloading.

Rope head blocking, movement and clamping spool by hydraulic drive.

Predisposition for strapping in 8 radii.

Coil taping and packaging: Automatic taping machine for spiral coating with paper band or plastic film

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Special Applications

Depending on the type of application and use, when a high resistance to environmental and weather agents is required, these ropes can be clad with different materials such as a PVC tube filed with grease, internal impregnation and external film in epoxy resin, heavy galvanize coating (hot) of the single wires composing the rope using zinc or zinc-aluminium.