Hot Dip Galvanized Pre-Engineered Steel Building for Quick Erection and Custom Designed Solutions
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 the customer's requirements. All the 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 the advantages of low cost, high durability, perfect quality control and fast erection; PEBs are used for various applications such as factories, warehouses, logistics center, showrooms, shopping malls, schools, hospitals, community buildings, etc.
- Factories
- Workshop
- Warehouses
- Cold Storages
- Steel Mills
- Assembly Plant
- 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 the 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.
The purpose of method statement is to describe the guidelines and methodology followed by our company during the fabrication, blasting, painting and supply of pre-engineered structure for any of steel building project.
- Verify the receiving documents and quantity of the received material by stores
- Submit the load for QC inspection by stores
- QC performs visual inspection to confirm surface condition and check for damages
- Dimensional inspection if material passes visual inspection
- Verification of supporting documents like MTC
- Preparation of Incoming Material Inspection Report
Design and Development department will make the drawings of the structural of project. As per the drawings, production department will prepare the items. The preparation of items is divided into two:
- Drawings transferred to storage device using expert software
- Drawings copied 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
- Fabrication drawings prepared by design department
- Automated cutting and drilling machine processes
- Transfer from drilling machine to fit-up section
- Fabrication drawings issued by production engineer
- Fabricators collect prepared beams and connection details
- Fixation of end plates, gusset plates, stiffeners, purlin cleats, stay angle cleats etc.
- Tack welding of components
- QC inspection after fit-up completion
- Planning of jobs to be welded
- Cleaning of welding locations
- Setting wire feed and voltage
- Maintaining fillet size parameters per GB50661-2011 standard
- Removal of spatters and slag
- Grinding of burrs, sharp edges and excessive reinforcements
- QC inspection
- Planning of jobs to be welded
- Cleaning of welding locations
- Setting wire feed and voltage
- Maintaining fillet size parameters per GB50661-2011 standard
- Removal of spatters and slag
- Grinding of burrs, sharp edges and excessive reinforcements
- QC inspection
- Tool Box Talk performed by Foreman
- Barricading of working area
- Recording of fabricated steel ID for traceability
- Crane placement on "in-feed" rack
- High pressure air cleaning
Material is fed into the chamber through conveyor with rubber curtains to prevent abrasive escape.
- Trained machine operators
- Six internally mounted wheels for blasting
- Slow movement through chamber
- Emergence at Grade SA 2/2.5 cleanliness
- Full PPE requirement for personnel
Application of paint normally done once per day in the afternoon after blasting work completion.
- QC inspection of blasted surfaces
- Re-blasting if standards not met
- Ambient conditions check before application
- Surface temperature and humidity requirements
- Atmospheric conditions inspection per GB50205-2001
- Air temperature: 5-40°C
- Substrate temperature: 23-40°C
- Relative humidity: 50-85%
- Application by Airless spray method
- Wet Film Thickness monitoring
- Primer coat: Per project requirement
- Second coat: Per project requirement
- Third coat: Per project requirement
- Touchup at site after erection
- Receiving finished components from painting department
- Proper storage job-wise in yard
- Arranging trucks from contract companies
- Loading after job clearance
- Documentation maintenance
With 20 year warranty in the steel building industry, our company has standard on the quality of steel building. We have acquired the ISO9001 and CE certificate. The followings are the related standard that we strictly follow whether for the 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 up the technical requirements of welded members and improve the standardization of our fabrication.
This manual applies for the design, fabricate and inspection for the fillet weld size.
Length of catheti from maximum isosceles triangle that drawn from the section of fillet welding seam.
- 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)
- Edge welding limitations based on member thickness
- Circular hole limitations: K≤(1/3)d
- Maximum size without groove: 17mm
| Form of Fillet Weld Leg | K Value | Note |
|---|---|---|
| Fillet weld without groove | K=(0.7~1)t and ≤15mm | For most steel structure buildings |
| Fillet weld without groove | K=(0.5~0.6)t | For strengthening ribs and secondary members |
| Fillet weld with groove (CJP and PJP) | K=t/4 and K≤10mm | For most steel structure buildings |
| Fillet weld with groove (CJP and PJP) | K=t/2 and K≤10mm | Important members (crane beams) |
| Parent Metal Thickness (t) (mm) | Minimum Fillet Weld Size |
|---|---|
| t≤6 | 3 (minimum 5 for crane beam) |
| 6 | 5 |
| 12 | 6 |
| t>20 | 8 |
To ensure the welding quality, meeting up the technical requirements of welded members and improve the standardization of our fabrication.
This manual applies for the design, fabricate and inspection of groove joint in terms of manual arc welding, CO2 arch welding, mixed gas arch welding, submerged arc welding and electroslag welding.
Key points on design welding groove:
- Minimize the amount of filler metal
- Easy for beveling
- Convenience for welding operation and slag removal
- Minimize welding stress and deformation
- Favor welding process and slag removal
- Minimize flip-flop during welding
- Consider actual fit-up methods
| Mark | Welding Method | Penetration Type |
|---|---|---|
| MC | Shielded metal arch welding | CJP-complete joint penetration |
| MP | Shielded metal arch welding | PJP-partial joint penetration |
| GC | Shielded arch welding / Self-shielded arc welding | CJP-complete joint penetration |
| GP | Shielded arch welding / Self-shielded arc welding | PJP-partial joint penetration |
| SC | Submerged arc welding | CJP-complete joint penetration |
| SP | Submerged arc welding | PJP-partial joint penetration |
| SL | Electroslag welding | - |
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