Stable Structure Prefab Metal Shed Warehouse with 50 Years Life Cycle Quick Erection and Cost Savings

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:

• Cost Savings: 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.
• Quick Erection: 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.
• Flexibility: Pre-engineered steel buildings are flexible in any requirement of design, easy to expand in the future and also economically with low transportation costs.
• Energy Efficiency: Nowadays, pre-engineered buildings are the green solution for the environment with CO2 reduction, energy efficiency, and recyclability.

• 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 (length, width, depth, thickness)
• Document verification (MTC, heat number matching)
• Prepare Incoming Material Inspection Report

• Transfer drawings to storage device using expert software
• Copy drawings into plate processing machine
• Automated plate processing according to NC files
• Punching of part mark on plates
• 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 by production engineer
• Fit-up of prepared beams and connection details
• Fixation of end plates, gusset plates, stiffeners, purlin cleats, stay angle cleats
• Tack welding in appropriate places
• QC inspection after fit-up completion

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

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

• Tool Box Talk performed by Foreman for every task
• Working area barricaded with information notices
• ID of fabricated steel recorded for traceability
• Raw material steel sections craned onto "in-feed" rack
• Cleaning with high pressure air to remove dust
• Automated blasting through conveyor system
• Six internally mounted wheels for blasting activity
• Full PPE required for personnel

• QC inspection of blasted surfaces before priming
• Ambient conditions check (temperature, humidity)
• Surface must be 3˚C above dew point temperature
• Relative humidity must be 85% or below
• Application by Airless spray method
• Paint material conformity checks
• WFT (Wet Film Thickness) readings during application
• Experienced spray applicators with appropriate PPE

• Primer coat: Per project requirement
• Second coat: Per project requirement
• Third coat: Per project requirement
• Touchup at site - after erection

• Receive finished components from painting department
• Store properly job-wise in the yard
• Arrange trucks from contract signed truck companies
• Start loading after job 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 and follow these related standards for design and fabrication:

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

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

Application Scope: Applying for design, fabrication and inspection of fillet weld size.

Manufacturing Process Flow: Steel plate cutting -> H section assembly -> Automatic welding -> H section strengthening -> Assembly -> Manual welding -> Shot blasting -> Painting -> Storage