Low Cost Single Span Pre-engineered Steel Building with 50 Years Life Cycle and Quick Erection

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 according to drawings:

• Transfer drawings to storage device using expert software
• Copy drawings 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 processing
• Transfer from drilling machine to fit-up section

• Fabrication drawings issued to production supervisor
• Fabricators collect prepared beams and connection details
• Fix end plates, gusset plates, stiffeners, purlin cleats, stay angle cleats
• 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
• Record ID of fabricated steel for traceability
• Clean material with high pressure air
• Automated blasting to SA 2/2.5 Grade
• Full PPE required for personnel

• QC inspection of blasted surfaces
• Check ambient conditions (temperature, humidity)
• Apply primer using Airless spray
• Monitor Wet Film Thickness (WFT)
• Experienced spray applicators with appropriate PPE
• Three-coat painting system with site touchup after erection

• Receive finished components from painting department
• Store components properly job-wise in yard
• Arrange trucks from contract signed companies
• Begin loading after clearance confirmation
• Maintain copies of all documents in job file

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

• 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.

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

H section steel plate checked for design compliance. CNC cutting equipment preferred for quality and material saving. High purity gases ensure smooth cutting surfaces.

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

H section members hoisted into gantry-type submerged arc automatic welding machine. Preheating for ultra-thick plates using electrical heaters.

Correction of flange flatness using strengthening machines. Flame correction for perpendicularity. Temperature controlled at 600~800ºC.

• Familiarize with component shop drawing and technical requirements
• Re-check model components by related department
• Accurate mark-up
• Inspect components after first assembly
• Batch assembly after qualified test

Manual welding processes as required for specific applications and complex joints.

Surface of members should be even, flat, glossy with full painting. Color and coating thickness meet design requirements. Standard thickness: 150μm indoor, 125μm outdoor.