Offsite steel structure construction

Prefabricated steel buildings, also known as pre-engineered buildings, are structures made from prefabricated steel components that are manufactured in factories and transported to the construction site for assembly.

Prefabricated steel buildings are widely used for industrial projects such as manufacturing plants and warehouses due to their flexibility, ability to span large distances, and fast construction time.

So what is the structure of a prefabricated steel building? What are the components and specifications?

Let's explore the structure of prefabricated steel buildings with DTC E&C to understand the cost estimates and construction work required for building a prefabricated steel building.

1. Components of prefabricated steel buildings

In the structure of prefabricated steel buildings, the following components should be ensured:

• Main structure: This is the structural system that forms the frame of the building, including foundation, foundation beam, column, I-beam truss, etc.
• Secondary structure: These are the weaker connecting parts that form the building, such as partitions, stairs, C-shaped and Z-shaped purlins, etc.
• Cladding: This includes roof panels and wall panels, which serve to protect the building from environmental impacts.

2. Specifications of prefabricated steel buildings

Below are the basic specifications of prefabricated steel buildings:

Span: The distance between two opposite columns, measured horizontally.

Column spacing: The distance between two opposite end columns, measured vertically. Column spacing usually ranges from 6 to 12m.

Height: The height of the outer column, measured from the foundation to the intersection point between the wall and roof. The height determines the ventilation of the prefabricated steel building.

Roof slope: The slope of the roof, with a range of 10-30%. Ensures water drainage for the building.

Floor load capacity: The ability to withstand the load of the foundation system. Floor load capacity depends on the function of the building, as well as the location of machinery, equipment, workload, etc. Roof load capacity: The ability to bear the load of the roof panel, insulation layer, wind load, crane system, etc.

Pre-engineered steel building structure

3. Pre-engineered steel structure

A pre-engineered steel structure includes the following basic components:

3.1 Foundation structure

The foundation structure functions to transfer the load from above down to the pre-cast concrete base below. Nowadays, various types of foundation structures such as single, strip, truss, and pile are widely used and suitable for the geological conditions of each region.

Before pouring concrete, it is necessary to install foundation bolts in advance, which is an important step that requires high precision. This will ensure that the installation of steel columns and beams can be done easily and accurately.

3.2 Workshop floor

The workshop floor is made of concrete and compacted with sand. The thickness of the concrete depends on the load of machinery and vehicles in the workshop. The floor needs to be polished or coated with waterproof epoxy that is easy to clean.

3.3 Main structural frame system

The main structural frame system of the factory includes steel columns, beams, and trusses. These are the most important components, capable of supporting and spanning large distances of up to 100m.

3.4 Skylights and canopy roofs

Skylights are usually placed on the top of the factory building to ventilate and provide ventilation during operation and production.

Canopy roofs are a system of rain and sun coverings at door and window positions.

3.5 Purlins and roof bracing system, column bracing system, and purlin bracing system

The purlins are made of galvanized steel in a C or Z shape with a distance of 1 to 1.5m. This system is tightly tied to the main frame and supports the metal roof system above. The roof bracing system, column bracing system, and purlin bracing system, although lightweight, are essential components of the workshop structure. They play an important role in stabilizing the frame during assembly and use

3.6 Anchor bolts

Anchor bolts are components used to connect the elements of pre-engineered steel buildings into a space or system. The structure of anchor bolts includes: a nut, two black bolts, bolt body, and deformation-resistant pin.

Anchor bolts rely on the friction of the threaded rings and nuts to hold the elements tightly together.

3.7 Beam columns, steel columns Independent layout:

Arrange the steel columns so that they are independent at each span and each knee is supported by straight bars. This not only allows flexible steel layout options but also ensures convenience and ease of construction.

Arrangement of intersection points:

• The positive moment resisting bars should be bent at the mid-span of each span, upward and then connected together to make the steel column resist negative moments.

• The spiral bending of bars to facilitate the connection of diagonal steel bars must ensure symmetry in the vertical plane containing the axis or total axis at the points of the steel bar in the vertical plane. Note that steel columns should not be bent as this will affect the quality of the construction.

3.8 Cover sheet and insulation materia

The cover sheet is coated with a layer of color to increase aesthetics and prevent corrosion from the surrounding environment. In addition, glass wool or air pocket insulation material is needed to regulate the temperature inside the building. This material not only prevents heat but also reduces noise for the factory.

4. Prefabricated steel structure construction process

The process of constructing prefabricated steel structures is entirely done using steel components. The basic implementation process is as follows:

• Locate the central axis and install anchor bolts
• Construct the main frame: columns, beams, purlins, etc.
• Install bracing and secure with bolts
• Cover with roofing and wall cladding

All components are manufactured to specification in a factory before being transported to the construction site for assembly according to the proper process, saving construction time.

DTC E&C - A reputable, quality civil and industrial construction design and construction unit

As the general contractor, DTC E&C undertakes all work from foundation, basement and structure to complete construction and landscape infrastructure. Construction work is carried out at the construction site according to the detailed construction plan agreed upon in the contract, with each phase checked, monitored and accepted upon completion of each item.

We are committed to 100% quality standards for our projects. Construction progress is one of the important criteria in project implementation and is a commitment to timely delivery. Delayed progress has almost never occurred in all the projects we have implemented and completed.

These are the top criteria that have earned the trust of customers for more than 13 years with DTC E&C.

For more information and advice, please contact us:

DTC E&C Vietnam Joint Stock Company

Address: 8th Floor, C Building, 219 Trung Kinh, Yen Hoa, Cau Giay, Ha Noi

Mail: info@daitech.com.vn

Web: daitech.com.vn

 https://noithatdaitech.com

Phone: (+84) 24 3556 0037