Prestressing Tension Machine

Product Overview

Introduction Accelerate your precast concrete production with our high-precision prestressing tension machine series. Specially engineered for the manufacturing of prestressed concrete lintels, hollow core slabs, poles, and beams, our prestressing steel wire tension machine delivers absolute accuracy, uniform tensioning force, and maximum operator safety. Whether you are running a high-volume precast factory or a specialized structural engineering site, our smart hydraulic tensioning systems ensure your steel wires and strands achieve the exact elongation and tensile strength required.

Max. Tensioning Force: 500 kN
Applicable Wire Diameter: $\varnothing$ 5 mm - $\varnothing$ 9 mm ( & Steel Strands)
Max. Cylinder Stroke: 300 mm (Customizable)
Tensioning Speed: 200 - 500 mm/min

Key Advantages

Why choose KELAI precast machinery

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High Output Efficiency

Continuous extrusion technology delivers high output per day, dramatically reducing labor costs and project timelines.

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Robust & Durable Build

Heavy-duty steel frame with wear-resistant components ensures stable operation in demanding construction environments for years.

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Global After-Sales Support

Dedicated technical team provides installation guidance, operator training, and spare parts supply to clients worldwide.

Frequently Asked Questions

Common questions from buyers around the world

A: Yes, we offer both single-wire and multi-wire configurations. For standard long-line precast beds (like hollow core slab lines), our multi-wire prestressing steel wire tension machine can tension the entire array simultaneously using a heavy-duty tensioning beam, ensuring uniform stress distribution and cutting prep time by up to 60%.
A: Our advanced models utilize a dual-control verification method—measuring both hydraulic pressure (force) and piston stroke (elongation) simultaneously. The digital PLC system displays the real-time kN value and automatically matches it against the physical elongation of the steel wire. If any discrepancy exceeds the preset tolerance, the machine pauses automatically and alerts the operator.
A: To ensure long-term reliability in dusty precast environments, we recommend three routine steps:Check the hydraulic oil level weekly and replace the oil filters every 6 months.Regularly inspect the internal teeth of the tensioning wedges/anchors, as worn wedges can cause wire slippage.Calibrate the digital pressure gauge/load cell at least once a year to maintain Class 1 accuracy.
A: Absolutely. No two precast factories are exactly identical. We regularly customize the cylinder stroke, max pulling tonnage, and anchoring frame structures to seamlessly retro-fit into your existing precast long-line concrete beds or post-tensioning projects.

Product Overview & Core Advantages

Our Prestressing Tension Machine integrates a heavy-duty hydraulic jack, an intelligent electric oil pump split-system, and a digital control console. It allows precast manufacturers to pull high-tensile steel wires simultaneously or individually with digital precision, eliminating structural risks caused by manual over-tensioning.

We offer multiple configurations of our prestressing tension machine to fit different precast bed layouts and wire diameters

Key Benefits for Precast Plants:

  • Synchronized High-Precision Pulling: The digital hydraulic control loop maintains a precise force tolerance within $\pm1\%$, ensuring consistent structural camber in all precast elements.
  • Dual-Stage Automation: Features automated tensioning, holding, and releasing cycles via an easy-to-use PLC interface, significantly speeding up bed setup times.
  • Built for High-Tensile Wire: Engineered specifically to handle high-tensile carbon steel wires (typically $\varnothing$ 4mm to $\varnothing$ 9mm) and multi-strand steel cables.
  • Triple Safety Protection: Equipped with an automatic pressure-relief safety valve, an anti-rebound shielding frame, and a digital overload warning system to protect factory floor workers.

Applications in Precast Concrete Manufacturing

Our prestressing steel wire tension machine is the backbone equipment for producing high-load-bearing precast elements used in modern infrastructure.

Primary Applications:

  • Prestressed Hollow Core Slabs: Provides the critical initial tension for long-line casting beds before concrete pouring.
  • Concrete Lintels & T-Beams: Ensures residential door/window lintels and structural T-beams have the tensile strength to resist bending.
  • Electric Concrete Poles & Piles: Used in spinning molds to create high-durability utility poles and foundation pipe piles.
  • Railway Sleepers: Meets the strict, ultra-high-precision tension profiles required for high-speed railway concrete ties.
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