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Stainless Steel Flyover Piers & Girders

Piers, pier caps and box girders in IRS 450 stainless steel, made on a dedicated line. At Allmarc AM InfraCon, our JV with Aakshya Infra, for BMC flyovers in Mumbai: a first for India.

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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

A stainless steel flyover

Stainless steel needs no painting for the life of the bridge. It is also harder to cut and weld, which is why we built a dedicated line for it. 25,000+ T for MMRDA metro bridges, and now 75,000 T for BMC flyovers over the next 3 years.

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

02 / 06

Pier shells

IRS 450 plate, 25 to 75 mm, plasma cut and edge bevelled, then welded on the submerged-arc line with a plate manipulator.

How is it possible at Allmarc?
Messer MultiTherm PRO CNC plasma in the Allmarc works

Used here for: Pier shells

  • Hypertherm XPR 460, first in India
  • 5 oxy-fuel torches
  • 4 x 35 m bed
All our machinery

Used here for: Pier shells

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

03 / 06

Pier cap

A tapered box across the carriageway, with diaphragms under every bearing, fitted and welded in the 30 m bay.

How is it possible at Allmarc?

Used here for: Pier cap

  • Plates matched and tack-welded
  • Automatic feed and stitch welding
  • H and I sections built from plate
All our machinery

04 / 06

Box girders

Flanges, webs, diaphragms and stiffeners welded by the Cloos robot over their full length, milled and drilled at the splices.

How is it possible at Allmarc?

Used here for: Box girders

Tapered rafters and other non-uniform built-up sections, welded faster and with deeper penetration.

  • 40 m, state of the art
  • No programming: weld lines taken from the 3D model
  • Tandem torch: two wires at once
All our machinery
SKDX1030 CNC end-face milling in the Allmarc works

Used here for: Box girders

  • Mills beam and column ends square for bolted splices
All our machinery
Kotec newRun10DX CNC beam drilling line in the Allmarc works

Used here for: Box girders

Heavy profiles that need precise holes, where plasma cannot do the job: the lower structure and panel borders of a ground flare, and every bolted PEB and multi-storey frame.

  • H-beams up to 1,000 x 500 mm
  • Drills 3 faces in one pass
  • Channels, angles and box sections
All our machinery

05 / 06

Shear studs

Studs welded on the top flange to tie in the concrete deck.

06 / 06

Every plate, apart

Pier, cap, girders, diaphragms 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.
Start a project

Have a drawing? Let us build it.

We fabricate to your design, from plate to a packed container. An engineer will tell you honestly how we would build it.

Send us a drawing