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  4. Pylon Anchor Boxes
Industries · Infrastructure

Pylon Anchor Boxes

The steel boxes inside a cable-stayed bridge pylon that anchor the stays: E410 plate, anchor tubes at each stay’s angle, machined bearing plates and shear studs.

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Allmarc 3D model · to scale
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How it is built.

Scroll: the camera moves to each part in turn and ends on the exploded view. Drag to turn it round yourself.

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01 / 06

Where the cables hold the bridge

Each stay cable is anchored inside a steel box in the pylon. We made 60 of them, 18 T each, for the Missing Link cable-stayed bridge.

Scroll to see how it is built · drag to turn it round

02 / 06

The box

E410 plate cut and bevelled, welded into a stiff box, matched course to course so the stack goes up true.

How is it possible at Allmarc?

Used here for: The box

In 2024 we were the only buyer of Deratech’s 20 kW, 12 m laser.

  • 20 kW
  • 12 x 3 m bed
  • Pallet changer
All our machinery

Used here for: The box

  • Full-penetration welds on built-up sections
All our machinery

03 / 06

Tubes at the stay angle

Each tube set at its stay’s angle in a jig; an error here is an error in the bridge.

04 / 06

Bearing plates

The plates the anchors bear on, machined flat.

How is it possible at Allmarc?
SKDX1030 CNC end-face milling in the Allmarc works

Used here for: Bearing plates

  • Mills beam and column ends square for bolted splices
All our machinery

05 / 06

Bonded into the pylon

Studs on the outer faces tie the box into the concrete.

06 / 06

Every part, apart

Boxes, tubes, bearing plates and studs.

Why Allmarc

Experience you can trust.

We fabricate to your drawings and prove the fit in our own bay before anything ships. Open any line for the detail.

Talk to an engineer
Heavy or delicate
  • 600 T flare chambers and 1 to 2 mm sheet metal, under one roof.
  • Each job goes to the plant built for it.
Repeat parts, identical
  • Fixtures, robots and CNC lines, so the hundredth matches the first.
  • Machined after welding where it matters.
Proven before it ships
  • Trial-assembled in the works.
  • Inspected and documented at every stage.
Scale
  • 4 plants at Kanbha; about 6,000 T a month from November 2026.
  • ISO 9001, ISO 45001, EN 1090, EN ISO 3834-3; RDSO approved.
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We fabricate to your design, from plate to a packed container. An engineer will tell you honestly how we would build it.

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