Pre-engineered Steel Structure Building with 50 Years Lifetime, Quick Erection,

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.

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 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).

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.

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 to confirm surface condition and damages
• Dimensional inspection including length, width, depth, thickness
• Verify supporting documents like MTC
• Prepare Incoming Material Inspection Report

Preparation of Plates:

• Transfer drawings to storage device using expert software
• Copy drawings into plate processing machine
• Automated machine senses plate length and carries out processing
• Punching of part mark on plate
• Drilling of plates as per NC files
• Plasma cutting of plates

Preparation of Beams/Tubes:

• 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
• Prepared beams and connection items collected for fit-up
• End plates, gusset plates, stiffeners fixed by tack welding
• QC inspection after fit-up completion

Submerged Arc Welding Procedure:

• 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

MIG Welding Procedure:

• 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

• 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
• Automated blasting process with six internally mounted wheels
• Full PPE required for personnel

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

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

Purpose: To ensure 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.

Fillet Weld Leg Size Requirements:

• 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

Steel plate cutting aims at quality guarantee and material saving. CNC cutting equipment is preferred for cutting. High purity 98.0% acrylic gas and 99.99% liquid oxygen gas are used to guarantee smoothness and flatness of cutting surface.

Assembly process is set up on imported H section production line. 4 hydraulic positioning system press firmly against between upper/lower flange and web plates. Fixing welding adopts CO2 gas shielded welding.

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

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

• 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 then batch assembly after qualified test

Manual welding processes as required for specific components and connections.

Surface of members should be even, flat, glossy and full painting without cracking, peeling and pin holing. Standard coating thickness: 150μm indoor, 125μm outdoor.