Engineered alongside our custom spiral steel stairways, Joint Star Steel Structure Ltd. manufactures full-envelope steel frameworks, acoustic insulated panels, and composite decking to provide complete turnkey construction packages across Thailand.
In high-density industrial facilities, pre-engineered steel buildings (PEB), and contemporary architectural spaces across Thailand, vertical access systems require a precise balance between structural optimization, spatial economy, and environmental resilience. Joint Star Steel Structure Ltd. delivers comprehensive custom OEM spiral steel staircase systems manufactured under strict ISO 9001 quality frameworks, conforming precisely to the Thai Industrial Standards Institute (TIS), the Building Control Act B.E. 2522 (and Ministerial Regulation No. 55 B.E. 2543), alongside international benchmarks including AISC 360-16, ASTM A36, BS EN 1993-1-1 (Eurocode 3), and EN ISO 14122-3.
Unlike rectilinear stairways that occupy extensive horizontal real estate, an engineered spiral or helical steel staircase transfers dead and live loads radially back to a structural central torque tube or outer perimeter helical plate stringers. In industrial manufacturing units within Chonburi and Rayong, our heavy-duty spiral stair towers optimize mezzanine footprint by up to 68% relative to switchback configurations, providing uncompromised emergency egress and routine operational transit to intermediate platforms, crane operator cabins, siloing complexes, and automated picking racks.
Engineered from structural hollow sections (SHS/CHS) conforming to JIS G3444 STK400/STK490 or ASTM A500 Grade B/C. Diameters from 168mm to 406mm absorb torsional dynamic shear loads and bending moments with internal reinforcement diaphragms.
Fabricated with CNC laser precision from Q355B or SS400 plate steel. Available as non-slip diamond checker plate, heavy-duty hot-dip galvanized serrated grating, acoustic mineral core trays, or embedded hardwood architectural finishes.
Roll-formed 38mm to 50mm stainless steel 316 or powder-coated carbon steel handrails forming uninterrupted 3D spatial curves. Balustrade infills accommodate laser-cut aesthetic panels, tensioned marine-grade wire rope, or safety mesh.
Engineered for Thailand's humid tropical and coastal maritime microclimates. Surface preparation to Sa 2.5 shot blast, followed by ISO 1461 hot-dip galvanizing or ISO 12944 compliant 3-coat epoxy-polyurethane high-durability barrier paint systems.
Our engineering department delivers customized OEM staircase fabrications designed specifically for the unique structural configurations, microclimates, and floor-to-ceiling challenges across Thailand’s core commercial and industrial zones.
Across industrial mega-estates in Rayong, Chonburi, and Chachoengsao (such as Amata City, WHA, and Map Ta Phut), manufacturing units demand compact, industrial-grade vertical access to mezzanine offices, heavy overhead crane runways, and maintenance platforms. Our OEM industrial spiral staircases are designed with hot-dip galvanized serrated grating treads that facilitate drainage of cutting oils and moisture while resisting harsh chemical vapors and constant multi-shift foot traffic.
From luxury hospitality developments along the Chao Phraya riverfront to tech-hub headquarters in Sukhumvit and Sathorn, architectural helical staircases serve as monumental focal points. Joint Star Steel provides high-aesthetic OEM spiral systems featuring concealed structural welds, custom curved steel plate stringers, integrated LED under-tread channel routing, and acoustic underlayments that mitigate impact sound transmission within upscale office and retail spaces.
Maritime environments in southern and eastern Thailand exhibit high salinity, torrential monsoon rains, and continuous high humidity (ISO 12944 C4 to C5-M corrosive atmospheric classifications). We engineer corrosion-proof exterior helical stair towers utilizing heavy-gauge structural carbon steel hot-dip galvanized to over 85 µm (minimum 610 g/m² zinc deposition), combined with 316-grade stainless steel hardware and fluorocarbon topcoats to guarantee decades of structural integrity without rust bleed.
Because Joint Star Steel manufactures 750 Type Galvanized Floor Decking Sheets and structural steel frames in-house, our spiral stair systems are detailed concurrently with mezzanine floor joists, primary portal frames, and concrete pour stops. We supply factory-welded connection brackets, shear tabs, and high-strength anchor assemblies (Grade 8.8 / Grade 10.9) that bolt directly into primary structural columns without requiring field modification or destructive structural alterations on site.
This pre-engineered modularity eliminates site welding risks, accelerates project installation timelines by up to 50%, and guarantees compliance with the strict structural deflections mandated by Thai civil engineering inspectors.
The Thai construction and industrial engineering sector is undergoing rapid transformation, propelled by the Thai Government's "Thailand 4.0" development model, aggressive expansion across EEC smart logistics zones, and strict new municipal energy efficiency guidelines. Structural engineers, EPC contractors, and multinational developers operating in Thailand are prioritizing prefabricated, lightweight structural steel products over traditional wet-pour reinforced concrete due to four decisive trends:
Rising on-site labor costs and tight industrial commissioning schedules in Samut Prakan and Pathum Thani mandate knock-down bolt-together stairs that erect within 48 to 72 hours, eliminating prolonged scaffolding obstruction.
Thai's Rating of Energy and Environmental Sustainability (TREES) rewards fully recyclable structural steel with low embodied carbon, moving away from carbon-intensive cast-in-place concrete stair cores.
Ministerial Regulations governing seismic loading in Northern/Central Thailand and high monsoon wind shear along coastal borders require high-ductility steel stair designs with structural elastic recovery.
Industrial buyers calculate 30-year lifecycle maintenance. Hot-dip galvanized and duplex epoxy systems significantly lower maintenance repainting costs within aggressive tropical manufacturing environments.
| Stair Configuration | Structural Capacity | Footprint Requirement | Optimal Thai Application | Protective Coating Options |
|---|---|---|---|---|
| Industrial Central-Column Spiral | Live Load: 4.0 - 5.0 kN/m² Point Load: 3.0 kN |
Compact: Ø 1,600 - 2,400 mm | EEC Logistics Mezzanines, Factory Plant Egress, Chemical Processing Towers | Hot-Dip Galvanized ISO 1461 (>85 µm) or Industrial Polyurethane |
| Double Helical (Plate Stringer) | Live Load: 5.0 kN/m² AISC Architectural Spec |
Medium: Ø 2,600 - 4,500 mm | Bangkok Corporate Atriums, Luxury Hotels, Flagship Automobile Showrooms | High-Gloss Fluorocarbon (PVDF) or Matte Architectural Powder Coating |
| Exterior Marine Helical Tower | Live Load: 5.0 kN/m² Wind Load: 1.8 kPa (Typhoon) |
Engineered to Egress Spec | Phuket / Pattaya Coastal Resorts, Marina Jetties, Offshore Terminals | Duplex System: HDG + Epoxy Barrier Primer + Aliphatic Polyurethane (C5-M) |
| Modular Escape Spiral (Knock-Down) | Conforms to Thai Fire Egress Clear Width ≥ 900 mm |
Standard: Ø 1,800 - 2,200 mm | High-Density Urban Shophouses, Prefab Residential Villas, Modular Camps | Thermally Cured Electrostatic Polyester Powder Coat or Marine Enamel |
Since our establishment in 2010 under the motto “Your Future in Your Home”, Joint Star Steel Structure Ltd. has grown into a leading multinational steel structures fabricator, delivering integrated solutions from concept engineering through precision production and international site supervision.
Our specialized in-house structural engineering department models each staircase in 3D Tekla BIM environments, performing dynamic torsional frequency analysis, Finite Element Analysis (FEA) on cantilever tread joints, and automated clash-detection with building HVAC, fire sprinkler mains, and steel columns.
Beyond staircase components, we design and produce pre-engineered metal buildings, insulated sandwich panels (EPS, PU, Rock Wool), and civil foundation anchor plates. This end-to-end integration simplifies project procurement, eliminating interface conflict between disparate suppliers.
Every custom OEM spiral staircase undergoes a complete vertical trial pre-assembly within our manufacturing facility prior to dispatch. Radiographic, ultrasonic, and magnetic particle non-destructive weld testing (NDT) verify penetration before protective coatings are applied.
Technical, regulatory, and logistics clarifications addressing the direct concerns of Thai project owners, civil engineering contractors, and corporate procurement heads.
Our OEM spiral staircases are engineered to fulfill the stringent requirements set out in the Thailand Building Control Act B.E. 2522 and Ministerial Regulation No. 55 (B.E. 2543). For industrial and public commercial installations:
1. Tread Geometry: We maintain clear stair tread widths ranging from 900 mm to 1,500 mm. Tapered treads are designed such that the minimum tread depth measured at 300 mm from the narrow inner radius is never less than 220 mm to 250 mm, preventing trip hazards.
2. Riser Dimensions: Riser heights are calibrated between 150 mm and 190 mm (standardized across the flight to avoid variances exceeding 5 mm), ensuring safe, fatigue-free ascent.
3. Headroom & Landings: Minimum continuous vertical headroom clearance of 2,000 mm is strictly maintained throughout the 360-degree rotation, with resting landings engineered after every 3,000 mm to 3,500 mm of vertical rise.
For installations situated within 5 km of the Gulf of Thailand or the Andaman Sea, where high temperature, 85%+ relative humidity, and airborne airborne chlorides create an aggressive ISO 12944 C4 to C5-M (Marine) corrosive atmosphere, we recommend two proven protective regimes:
• Heavy Hot-Dip Galvanizing (HDG): Steel components are pickled and submerged in molten zinc bath in accordance with ISO 1461 / ASTM A123, producing an alloyed zinc-iron barrier layer exceeding 85 to 100 microns (610 to 705 g/m²). This provides sacrificial galvanic cathodic protection.
• Duplex Protective Coating System: For high-profile architectural or chemical plant installations, HDG is followed by an epoxy tie-coat and an aliphatic acrylic polyurethane or fluorocarbon (PVDF) topcoat. This duplex system extends service life up to 2.5 times longer than either galvanizing or painting applied independently.
Yes. We routinely process complete international trade documentation for consignments destined for Thai commercial sea ports, including Bangkok Port (Klong Toey) and Laem Chabang Port (Chonburi). Under the ASEAN-China Free Trade Area (ACFTA) or equivalent bilateral trade corridors, our export compliance department issues Certificate of Origin (Form E), allowing Thai importers to legally reduce or eliminate standard import tariffs on fabricated steel structures and accessories.
Each container shipment is supported by stamped mill test certificates (MTC conforming to EN 10204 3.1), piece-marked piece packing lists corresponding to Tekla installation drawings, and non-wood fumigation certification.
Custom spiral staircases are large, 3D volumetric structures that present logistical challenges if shipped fully welded. We employ an engineered "Knock-Down" (KD) modular architecture:
1. Central Column: Fabricated with precision-bored tread mounting sockets or flanged splice joints designed to fit comfortably inside standard 40ft High Cube (40HQ) ocean containers.
2. Stackable Treads: Treads are nested on heavy-duty custom steel pallets, separated by high-density polyethylene foam liners, and banded with high-tensile steel strapping to prevent surface abrasion or impact distortion.
3. Handrail Sections: Curvilinear handrails and stringers are securely cradled in padded structural steel framing cages, numbered with laser-etched stainless steel tags linked directly to step-by-step on-site assembly schematics.
Poorly engineered spiral staircases often suffer from excessive lateral flexure and bounce under pedestrian footfall. Our structural engineers design all spiral structures to adhere to the rigid dynamic criteria of AISC Design Guide 11 (Vibrations of Steel-Framed Structural Systems Due to Human Activity) and BS 5950-1:
• Deflection Limits: Tread cantilever deflection under full design live load (5.0 kN/m²) is limited to L/360 or a maximum of 5 mm.
• Fundamental Natural Frequency: The first fundamental vertical and lateral natural vibration modes are engineered above 5.0 Hz to ensure the structure falls well outside the pacing frequency of human walking or rapid industrial egress, eliminating resonance and psychological sensation of sway.
Yes. As a leading manufacturer of Prefabricated Steel Structures and composite floor decks, we provide customized top-of-flight transition landings and baseplate anchoring mechanisms tailored to your existing conditions:
• Concrete Slabs: Baseplates are sized to distribute reaction loads safely through high-tensile chemical wedge anchors without exceeding localized concrete shear capacity.
• Steel Mezzanines: Custom end-connection plates match the depth of primary mezzanine I-beams or channels, supplied with pre-drilled bolt holes for rapid cold-bolting.
• Wall Cladding Interfaces: Where stair balustrades run adjacent to insulated sandwich panels, we supply perimeter rub-rails and thermal bridge gaskets to preserve panel wall integrity.
