Prefabricated Apartment Building

Multi-Storey Prefabricated Steel Apartment Building | 7-Story Residential Structure Solution

A prefabricated steel apartment building is a modern residential housing system that utilizes a high-strength steel frame (typically Box Columns and H-beams) as the primary load-bearing structure. Designed for urban density, these buildings integrate galvanized steel decking for floors and advanced cladding for walls. This system is increasingly replacing traditional concrete for multi-family housing due to its 50% faster construction speed and superior seismic resilience.

Key Features & Advantages:

High Structural Efficiency: Utilizes Q355B/S355 steel grade, providing high load-bearing capacity with smaller column footprints, maximizing usable living space.

Rapid ROI for Developers: Prefabricated components are bolt-connected on-site, allowing a 7-story complex to be framed within 55 days.

Environmentally Adaptable: Perfect for regions with challenging logistics or soil conditions (like Central Africa), where lightweight steel reduces foundation costs.

Seismic & Wind Resistance: Engineered to meet Eurocodes and AISC standards, ensuring safety in diverse geological zones.

The 7-Story multi storey residential building Project

Project Name: Residential Steel Building (7-Story Apartment)

Location: Bangui, Central African Republic (Logistics via Douala Port, Cameroon)

Scale: 7 Storeys | Total Area: 5,210 sqm | Height: 23.77m

Technical Specification Table：

Case story:

Most of Central Africa lies on a plateau at an altitude of 600-900 meters. The capital, Bangui, is located on the banks of the Ubangi River and has relatively flat terrain, but the soil is mostly laterite and alluvial. This means that foundation design needs to pay special attention to soil bearing capacity.

Designed for the tropical climate of the Central African Republic, Honstar's steel apartment buildings feature enhanced thermal insulation and superior corrosion resistance. We understand the logistical challenges of shipping via Douala Port to Bangui, offering optimized container loading and precision-engineered structures compliant with Eurocode 3 for the Central African market.

The Honstar Solution:

Structural Strength: Given the 7-story height, we used heavy-duty Box Columns to ensure vertical stability while maintaining a slim profile to maximize

Strong Drainage and Leak Prevention During the Rainy Season: The rainy season in Central Africa is characterized by heavy rainfall and strong winds. Roof Slope: The slope of steel structure roofs should be appropriately increased (recommended not less than 10%) to ensure smooth drainage during heavy rain. Waterproofing at Joints: High-quality neutral silicone sealant must be used at window frames, door frames, and joints of corrugated steel plates to prevent leakage under wind pressure during tropical downpours.

Corrosion Protection in Humid Environments: Although Bangui is not near the ocean, extremely high humidity (especially during the rainy season) can still accelerate steel oxidation. Coating Standards: Steel columns (such as box columns) and steel beams must undergo rigorous rust removal (reaching Sa2.5 grade) and be coated with epoxy zinc anti-rust paint. Floor Decking: The galvanized steel decking used for floors should have a zinc coating of 120-180 g/m² to prevent corrosion from the bottom during its service life.

Lightning Protection: Thunderstorms are frequent in the Central African Republic, and steel-structured apartments, being tall metal structures, are highly susceptible to lightning strikes. Lightning Protection Design: A robust lightning rod and down conductor system must be designed, ensuring a grounding resistance of less than 1Ω. When using steel columns as natural down conductors, electrical continuity at welded joints must be ensured.

Logistics Constraints of Inland Transportation: As a landlocked country, all steel structure materials must be transshipped through the port of Douala in Cameroon before being transported by road to Bangui. Component Size Constraints: During Tekla Detailing, the length of individual components must be strictly controlled (ideally not exceeding 11.8 meters to fit into a 40'HQ container). Packaging Reinforcement: After thousands of kilometers of bumpy road travel, the packaging must be extremely robust to prevent paint abrasion or deformation of components during transport.

Global Applicability: This 7-story residential model is an ideal "Blueprint" for urban housing projects in DR Congo, Cameroon, Nigeria, and other rapidly growing African metropolitan areas.

Honstar Expertise: Building the Future of Global Housing

Advanced Manufacturing Power:

Our 177,000 sqm facility features 9 specialized production lines for light and heavy steel. For the Konzi project, we utilized CNC cutting and automated submerged arc welding to ensure every Box Column met ISO and CE quality standards.

Expert Overseas Logistics:

We are experts in "Landlocked Logistics." We handle the complexity of multi-port transshipment and professional packaging to ensure 100% of the 317 tons of steel arrives in perfect condition.

On-Site Installation Leadership:

Honstar provides more materials that every client wants to buy. We dispatch experienced engineers to global sites (from Botswana to Central Africa) to supervise local crews, ensuring the safety and precision of the 7-story assembly.

Global Design Partnership:

Our 18+ R&D engineers are familiar with the specific requirements of investors in Asia, Africa, and South America, providing customized PKPM and Tekla designs that comply with local building codes.

 

FAQ – Prefabricated Steel Apartments 

Q1: Is a steel structure apartment building as quiet as a concrete one?

A: Yes. By using composite floor systems (Steel Deck + Concrete) and sandwich panel walls with rockwool or PU insulation, steel apartments achieve excellent soundproofing and thermal insulation standards.

Q2: How do you prevent rust in high-humidity African climates?

A: All our main components (Box Columns/H-Beams) are treated with high-performance anti-corrosion painting (2-3 layers) or hot-dip galvanizing. This ensures the building remains maintenance-free for decades, even in tropical environments.

Q3: Can the 7-story design be customized for different floor heights?

A: Absolutely. Our engineers can adjust the story height (e.g., the 3.6m or 3.3m standard) and the overall scale to fit your specific plot size and local zoning regulations.

Q4: What is the lifespan of a Honstar steel apartment building?

A: Our residential steel buildings are designed for a 50+ year lifespan, compliant with AISC 360-22 and Eurocode 3 structural integrity standards.