25m Steel Truss Trestle: HN250 Chords, Box Bracing, Built for Pipes

Steel truss trestles (pipe racks) carry pipes, conveyors and equipment over long spans. Below is data from an actual 24.85 m truss trestle.

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Basic Specs

 

Item	Value
Structure type	Steel truss trestle
Total length	24.85 m (7 panels × 3.05 m)
Width	4.5 m
Height	14.7 m
Truss type	Parallel chord, X-braced
Top chord	HN250×125×6×9, Q355C
Bottom chord	HW250×250×9×14, Q355C
Columns	HM488×300×11×18, HW200×200×8×12
Web members	Box tube 150×6.0, 120×5.0, 60×4.0
Bracing	D152×4.0 round tube, Q355C
Secondary beams	Channel 14a, Q235B

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Member Schedule

 

Member	Section	Material
Top chord	HN250×125×6×9	Q355C
Bottom chord	HW250×250×9×14	Q355C
Main column	HM488×300×11×18	Q355C
Secondary column	HW200×200×8×12	Q355C
Vertical bracing	D152×4.0 round tube	Q355C
Diagonal web	Box 150×6.0	Q235B
Web member	Box 120×5.0	Q235B
Small web	Box 60×4.0	Q235B
Cross beam	Channel 14a	Q235B

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How It Works

The parallel chord truss works as a deep beam:

Chords take axial force: top and bottom chords carry tension and compression

Webs take shear: diagonal and vertical members transfer shear

X-bracing stabilizes: cross bracing prevents lateral sway

Pipe racks on top: pipes and conveyors sit on top chord

Open web = light: open truss weighs less than solid beam

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Advantages

Long span light weight — truss carries 25 m span at fraction of solid beam weight

Open for pipes — open web lets pipes pass through, no obstruction

Q355C toughness — Q355C steel has good low-temperature toughness

Modular panels — 3.05 m standard panels, repeatable fabrication

Bolted connections — truss nodes bolted, fast erection

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Disadvantages / Limitations

Many members — truss has hundreds of parts vs one solid beam

Node fatigue — bolted nodes can fatigue under repeated load

Needs painting — exposed truss members need regular painting

Wind load — open truss catches wind, needs bracing

Inspection access — nodes high up, hard to inspect

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Typical Applications

Pipe racks — industrial plant pipe support racks

Conveyor trestles — bulk material conveyor support

Pedestrian walkways — elevated pedestrian walkways

Power line supports — cable and pipe support structures

Mine trestles — ore processing plant trestles

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Fabrication Notes

Chords shop-cut to length, web members cut to panel geometry

All nodes bolted with gusset plates, no site welding

D152×4.0 bracing bolted between truss panels

Channel 14a cross beams bolted on top chord for pipe support

All Q355C main members, Q235B secondary members

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Steel truss trestle — 24.85 m long, 4.5 m wide, 14.7 m tall, HN250 top chord, HW250 bottom chord, box tube webs, D152×4.0 bracing, Q355C main steel, bolted connections, built for pipe racks and conveyor trestles.

**WhatsApp**: +86‑13889862778, +86‑18242444407
**Email**: eddie@zdsteels.com, wells@zdsteels.com