We provide a pre-engineered steel building and steel structure construction solution with a strong commitment to quality and progress. In particular, consulting is the first important step to give our customers the solution that best suits your needs. The consultation process is a tight two-way interaction between our consultant team and our customers. In which, we will base on project’s features to propose:

  • Consulting on optimal design solutions for the overall project structures.

    We not only give consulting on steel structure solutions but also related items of the project such as foundation structure, equipment installation solutions ...

  • Pre-engineered steel buildings or steel structure solutions meet all requirements of the manufacturing process and follow the capital budgeting process.

    Many factors affecting the construction and equipment installation will be considered such as:

  • Not only at meeting the project's requirements, we bring the better and better project for investors and owners by the optimal solution

    which is capable of improving efficiency, saving energy and operation costs. At the same time, the project has a potential life expectancy of 50-70 years.

  • Cost Estimation for Projects.

    In this process, ASI consulting team will estimate, process and allocate cost in the most appropriate and logical way. We will make estimates of the quantity and price of all the resources you need in order to finish the project. From there, ASI helps investors have an overview of the project and have a good preparation of resources for the project.

  • Construction time.

    With extensive experience in the design, manufacturing and erection of many projects, we will give accurate estimates of the time required to complete the project. Therefore, we could complete commitments on progress and quality with customers.

After ASI and customers agree on project solutions, project schedule and plan, the design phase will start.


Based on agreed terms from phase 1 - Consulting, ASI engineer team will carry out the design phase based on the latest American and European pre-engineered steel buildings and steel structures, including:

  • Technical design:

    shows what technical elements the building will have, as well as technical materials for each different component. Technical design is the backbone of the project. The results of this stage are architectural drawings and steel structure drawings

  • Production design:

    this stage provides production drawings so that the factory can fabricate accurately components and accessories. The drawings from the technical stage will be transferred to production drawings. The production drawing should show fully and in detail the size, quantity, shape, and technical specifications of each component.

  • Erection design:

    Erection drawings describe site plans, erection phase diagram and erection requirements with good access to the erection location. Pre-engineered steel building and steel structure requires high erection accuracy to ensure sustainable construction.

ASI Design team with high expertise and rich experience will offer optimal design solutions to bring the highest quality and the most cost-efficient building solutions for our customers. We utilize cutting-edge contemporary engineering softwares for structural analysis and detailing. During more than 1 years, ASI has successfully designed projects in Vietnam and supplied steel structures for export to many regions around the world. We are capable of providing optimal solutions for many types of projects such as factories, warehouses, industrial buildings, commercial centers, public buildings...

We always update cutting-edge contemporary engineering software in pre-engineered steel buildings and steel structure design: SAP 2000 or ETAB, CFS purlin design, Tekla which is used to design production and erection drawings. Designed according to American design standards MBMA (Technical guidance on steel building system), AISC (Technical guidance on steel structures, Allowable Stress Design).


Manufacturing process has three separate stages to manufacture three main constituting components including:

Primary members:

column, beam

Secondary members:

purlin, door…


roof sheet, wall cladding, flashing…

A. Primary member

  1. Cutting:
    • By the CNC automatic multi-head cutting machine, steel plates can be cut to any shape design. All the plates are cut to any required size by extremely hot temperature with thickness up to 80mm.
    • Equipment and machines:

      • CNC automatic cutting machine.
      • CNC Cutting Machine
      • Mechanical cutting machines 6100x20mm is able to cut steel plate with the thickness up to 20 mm.
      • CNC (6100 x 20) mm Shearing Machine
      • Mechanical cutting machine 6100x16mm is able to cut steel plate with the thickness up to 16 mm.
      • CNC (6100 x 16) mm Shearing Machine
  2. Hole Punching
    • After cutting, use the automatic drilling machine to drill or punch holes on the cutter plates as required.
    • Equipment and machines: drilling machine, hole-punching machines.
    • CNC Punching Machine
      CNC Drilling Machine
  3. Assembling
    • Joining steel plates into the beam or column, building components by automatic or semi-automatic assembling machine.
    • Equipment and machines: automatic or semi-automatic assembling machine.
    • Automatic Assembling and Welding Machine
      Assembling and Welding Machine
  4. Welding and connection details welding:
    • After assembling, components are transferred to the next procedure of welding two flanges of steel plates with submerged arc weld. This process creates welds with high quality, big intension and absolute sealing.
    • We apply modern welding technology according to the welding procedure approved by AWS American Welding Association Standards.
    • Equipment and machines: automatic welding machines, hand welding machines.
    • Automatic Welding Machine
  5. Surface cleaning:
    • Built-up steel plates and welds are then cleaned physically or cleaned by using the sand-spraying machine, depending on the customers' choices.
    • Equipment and machines: automatic shot-blasting machine, grinders.
    • Shot Blasting Machine
  6. Painting:
    • ASI uses the industrial high-pressure painting machine according to American technology that creates a tough, durable and beautiful finish. Building components will be sprayed of grey paint coating or red paint coating or other special paints according to the customers' choices.
    • Equipment and machines: High-pressure paint spraying machine, grinders
    • Painting Steel Section

B. Secondary members

  1. Forming:
    • All secondary components such as purlins and girts are manufactured from the Zinc-coated Cold-Rolled Steel Sheet in Coils or black-coated Cold-Rolled Steel Sheet in Coils in accordance with ASTM standard. These components are then cold-formed into “Z” or “C” shape with the thickness from 1,5mm to 2,5mm.
    • Shaped from cold-rolled steel
    • The time during adjusting rollers is around 2 ~ 3 minutes without changing rollers. After the roll is formed by this roll forming machine, the surface will be very smooth and beautiful without any scratch on the surface.
    • Machine: Purlin Rolling Machine

      • C-Purlin forming machine.
      • Z-Purlin forming machine.
      • Z-Purlin Forming Machine
        C-Purlin Forming Machine
  2. Hole Punching
    • Purlins and girts can be supplied plain, or punched using hole punching standard, spaced to your specifications.
  3. Painting:
    • ASI uses the industrial high-pressure painting machine according to American technology. Building components will be sprayed of grey paint coating or red paint coating or other special paints according to the customers' choices.

C. Sheeting


Erection of

pre-engineered buildings and steel structure

is the last step in our building process that all the components from the previous steps come together.

General Rules

Erection Steps

Step 1: Prepare before erection

Check the erection equipment, and materials, including: quantity, safety, quality…

Step 2: Erect column and bracings

The intermediate or interior frames nearest the bearing endwall are usually erected first. This bay usually contains the diagonal bracing. Erect the columns first, tie them together with the sidewall girts and tighten the anchor bolts. Tie all the temporary bracings before releasing the crane load.

Step 3: Erect rafter

After the columns have been erected, the ground-assembled rafter is hoisted into place and connected to the columns. The rafters are assembled on the ground that need to install the flange braces & tighten the splice joints. The flange brace should be bolted to the rafter prior to raising in order to save time. Lift & erect the rafter assembly, ensure to tie enough guy wire ropes & tag lines.

Step 4: Install purlins and girts

Galvanized steel purlins are usually formed in shapes C, Z ... with purlins distance from 1m - 1.5m. Purlins are linked to the main steel frame to support the roof system. All purlins, girts, and eave struts are installed in the braced bay and the entire bay plumbed, aligned and braced before proceeding further. If the building is designed without cable bracing, the erector is responsible for providing temporary erection bracing.

Step 5: Calibrate the first frame

Step 6: Erect next frame

Step 7: Complete installation for the rest frame

Step 8: Erect roof monitor

Step 9: Check completion before covering

Step 10: Erect covering and finish

Clients & Partners