Pre-engineered Steel Building with 50 Years Life Cycle, Quick Erection, and Cost Savings for Industrial Use

Pre-engineered steel buildings are steel structures built over a structural concept of primary members, secondary members, roof and wall sheeting connected to each other and various other building components.

These buildings can be provided with different structural and non-structural additions such as skylights, wall lights, turbo vents, ridge ventilators, louvers, roof monitors, doors & windows, trusses, mezzanine floors, fascias, canopies, crane systems, insulation etc., based on customer requirements. All steel buildings are custom designed to be lighter in weight and high in strength.

Pre-Engineered Buildings are the most flexible solutions for contractors and owners. With advantages of low cost, high durability, perfect quality control and fast erection; PEBs are used for various applications:

• Factories
• Workshops
• Warehouses
• Cold Storages
• Steel Mills
• Assembly Plants

• Showrooms
• Supermarkets
• Offices
• Shopping Centers
• Exhibition Halls
• Restaurants
• Logistic Centers
• Multi-purpose Buildings

• Schools
• Hospitals
• Conference Halls
• Laboratories
• Museums
• Stadiums
• Farms
• Utility Shelters
• Pump Stations
• Aircraft Hangars
• Airport Terminals

Price per square meter can be 25%-30% lower than conventional steel buildings. Site erection cost is low because of faster erection times and easier erection process.

All steel components are fabricated at the factory and linked by bolts at the site. So the erection process is fast, step by step, easy to install and requires simple equipment. 60% less construction time required compared with traditional R.C.C (reinforced concrete) building.

Pre-engineered steel buildings are flexible in any requirement of design, easy to expand in the future and also economically with low transportation costs.

Nowadays, pre-engineered buildings are the green solution for the environment with CO2 reduction, energy efficiency, and recyclability.

Pre-engineered metal buildings consist of following components:

• Primary Members / Main Frames
• Secondary Members / Cold Formed Members
• Roof & Wall Panels
• Accessories, Buyouts, Crane System, Mezzanine System, Insulation, etc.
• Sandwich Panels

Primary members are the main load carrying and support members of a pre-engineered building. The main frame members include columns, rafters and other supporting members. The shape and size of these members vary based on the application and requirements.

Secondary structural framing refers to purlins, girts, eave struts, wind bracing, flange bracing, base angles, clips and other miscellaneous structural parts. Purlins, girts and eave struts are cold formed steel members which have a minimum yield strength of 345 MPa (50,000 psi) and will conform to the physical specifications of GB/ISO/CE or equivalent.

Standard steel panels are 0.3, 0.4, 0.5 mm or 0.6 mm thick and have a minimum yield strength of 345 MPa. Steel panels are hot dipped and galvanized with zinc or zinc-aluminium coating. The base material is pretreated, before applying a corrosion resistant primer and top coat. The combined thickness of the painted film is 25 microns on the front side and 12 microns on the reverse side.

Other building accessories include anchor bolts, fasteners (bolts, nuts, turnbuckle, expansion bolts), gutters, downspouts, doors, windows, ventilators, skylight panels, louvers and all other building-related materials.

• Verify receiving documents and quantity of received material
• Submit load for QC inspection
• Visual inspection for surface condition and damages
• Dimensional inspection for length, width, depth, thickness
• Verification of supporting documents like MTC
• Preparation of Incoming Material Inspection Report

Design and Development department creates structural drawings. Production department prepares items as per drawings:

• Drawings transferred to storage device using expert software
• Drawings copied into plate processing machine
• Automated machine senses plate length and processes according to NC files
• Punching of part mark on plate
• Drilling of plates as per NC files
• Plasma cutting of plates

• Fabrication drawings prepared by design department
• Automated cutting and drilling machine processes
• Job transferred to fit-up section after completion

• Fabrication drawings issued to production supervisor
• Fabricators collect prepared beams for fit-up
• Connection details fixed by tack welding
• QC inspection after fit-up completion

• Plan jobs to be welded
• Clean welding location free of dust, oil, grease
• Set wire feed and voltage for welding
• Maintain fillet size parameters per GB50661-2011 standard
• Remove spatters and slag after welding
• Grind off burrs, sharp edges and excessive reinforcements
• QC inspection after completion

• Plan jobs to be welded
• Clean welding location free of dust, oil, grease
• Set wire feed and voltage for welding
• Maintain fillet size parameters per GB50661-2011 standard
• Remove spatters and slag after welding
• Grind off burrs, sharp edges and excessive reinforcements
• QC inspection after completion

• Tool Box Talk performed for every task
• Working area barricaded with information notices
• ID of fabricated steel recorded for traceability
• Raw material cleaned with high pressure air
• Material fed into automated blasting chamber
• Six internally mounted wheels throw steel shot at high velocity
• Material emerges fully cleaned (Grade - SA 2/2.5)
• Full PPE required for personnel

• QC inspection of blasted surfaces before priming
• Atmospheric conditions checked and recorded
• Surface temperature must be 3˚C above dew point
• Relative humidity must be 85% or below
• Paint applied by Airless spray method
• Wet Film Thickness readings taken during application
• Experienced spray applicators with appropriate PPE

• Receive finished components from painting department
• Store components properly job-wise in yard
• Arrange trucks from contract signed companies
• Loading starts after clearance confirmation
• Document copies kept in job file

With 20 year warranty in the steel building industry, our company maintains high quality standards. We have acquired ISO9001 and CE certificates. We strictly follow related standards for design and fabrication of steel buildings:

• GB/T1591-2008/2018
• GB/T11263-2010
• GB/T 2518-2008
• GB/T12754-2006
• GB/T 1228-2006

To ensure the quality of fillet weld, meeting technical requirements of welded members and improve standardization of fabrication.

This manual applies for design, fabrication and inspection of fillet weld size.

• All fillet weld size should not be less than drawing and design values
• Minimum fillet weld size K≥1.5×t (t = thickness of thicker welding member)
• Maximum fillet weld size K≤1.2t (t = thickness of thinner welding members)
• For fillet weld on edge of welding members: when t≤6mm, K≤t; when t>6mm, K≤t-(1~2)mm
• For fillet weld in circular holes or trench holes: K≤(1/3)d
• Fillet weld without groove should not exceed 17mm

Steel plate cutting → H section assembly → Automatic welding → H section strengthening → Assembly → Manual welding → Shot blasting → Painting → Storage

H section steel plate checked by factory and applied under design requirements. CNC cutting equipment preferred for quality and material saving. High purity 98.0% acrylic gas and 99.99% liquid oxygen gas used for smooth cutting surfaces.

Assembly process on imported H section production line. 4 hydraulic positioning system presses firmly between upper/lower flange and web plates. CO2 gas shielded welding for fixing.

Equipment: H section steel assembly machine, Model No.: Z20B
Application: H type assembly, flange width 150-800mm, web height 160-2000 mm

H section steel members hoisted into gantry-type submerged arc automatic welding machine. Welding according to specified sequence and parameters. Preheating for ultra-thick plates using electrical heaters.

Equipment: Gantry-type submerged arc automatic welding machine, Model No.: LHA5ZB
Application: Assembly welding of H section steel, maximum cross section 800mm×2000mm

Correction of flange flatness using H section steel flange plate strengthening machine. Flame correction for perpendicularity between flange and web plate. Flame temperature controlled at 600~800ºC.

Equipment: H section steel strengthening machine, Model No.: YTJ60B
Application: Correcting deformation of I beam or H section, flange width 200-1000mm, thickness ≤60mm

Equipment: H section flange strengthening machine, Model No.: HYJ-800
Application: Correcting deformation, flange width 160-800mm, thickness ≤40mm

• Familiarize with component shop drawing and technical requirements
• Re-check model components by related department
• Accurate mark-up
• Inspect component after first assembly
• Pre-assembly for first group, batch assembly after qualification

Manual welding processes as required for specific components and connections.

Equipment: 10-ramming heads shot blasting machine, Model No.: QH1525
Application: Shot blasting of section steels, H section steel, welded members and steel plates. Machine entry size: 1500×2500, up to Sa2.5 Grade.

Member surfaces in even, flat, glossy painting without cracking, peeling or pin holing. Standard thickness: 150μm indoor, 125μm outdoor. Allowable deviation: -25μm.

Equipment: Airless sprayer, Model No.: CPQ9CA
Application: Surface paint of structural members, Derived capacity: 56 L/min, Pressure ratio: 32:1