13 Pieces, 7.9 Tons: How Pre-Fab Steel Frames Go Up in Days

Pre-engineered steel frames are shop-fabricated, trucked to site and bolted together. Below is data from an actual 13-piece rigid frame building.

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Basic Specs

 

Item	Value
Frame ID	GJ-1
Total pieces	13 (7 columns + 6 beams)
Total weight	7,920.7 kg (7.9 t)
Material	Q355B
Column type	Tapered WH(300~700)×300×8×12
Beam type	Tapered WH(700~400)×300×8×12
Column height	11.5–12.3 m
Connection	M20 high-strength bolts, shop-plated

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Component List

 

Member	Section	Length	Weight
GZ-1 column	WH(300~700)×300×8×12	11,517 mm	1,081 kg
GZ-2 column	WH300×300×8×14	11,895 mm	998 kg
GZ-3 column	WH300×300×8×14	12,315 mm	1,011 kg
GZ-4 column	WH300×300×8×14	11,925 mm	998 kg
GZ-5 column	WH(300~700)×300×8×12	11,522 mm	1,079 kg
GL-1 beam	WH(700~400)×300×8×12	3,729 mm	344 kg
GL-2 beam	WH400×250×8×10	8,159 mm	573 kg
GL-3 beam	WH(400~700)×300×8×12	3,779 mm	348 kg
GL-4 beam	WH400×250×8×10	8,460 mm	595 kg
GL-5 beam	WH(400~600)×250×8×12	4,080 mm	376 kg
GL-6 beam	WH(600~400)×300×8×12	4,228 mm	382 kg

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Why Installation Is Fast

The speed comes from three design choices:

Shop-fabricated pieces: every member cut, welded and drilled in factory

Bolted connections: M20 bolts, no site welding needed

Tapered sections: tapered columns and beams use only where load is high

Pre-drilled holes: -80×10 cover plates with holes match M20 bolts

Lift-and-bolt: column lifted, beam set, bolts tightened — done

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Advantages

Days not weeks — 13 pieces erected in 2–3 days with one crane

No site welding — bolted connections clean and fast

Q355B lighter — Q355B sections weigh less than Q235 same load

Tapered saves steel — tapered column uses 300mm at base, 700mm at top

Weather independent — bolted erection works in rain and cold

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Disadvantages / Limitations

Factory lead time — needs 4–6 weeks fabrication before delivery

Crane needed — 1-ton pieces need lifting equipment

Bolt inspection — every M20 bolt must be torqued and checked

Transport limits — 12m columns need long trucks

Foundation prep critical — bolt group positions must match exactly

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Typical Applications

Rapid-build factories — production starts in weeks

Warehouse expansion — add space fast

Temporary buildings — event halls, emergency shelters

Remote sites — no welding needed on site

Cold-weather construction — bolted works in winter

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Erection Sequence

Columns lifted and bolted to base plates

Beams lifted and bolted to column brackets

Cover plates -80×10 installed at splices

All M20 bolts torqued to spec

Bracing and purlins follow

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Pre-engineered steel rigid frame — 13 pieces, 7.9 tons total, Q355B tapered columns and beams, M20 bolted connections, shop-fabricated and trucked to site, erected in days for factory and warehouse buildings.

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