Box Shaped Steel Structure

Category：

Box Shaped Steel Structure
Browse number：

10
Release time：

2025-03-22 16:52:02
Share：

Detailed Description

1、 Core advantages of box Steel StructureUltra high bearing capacity and torsional performance

Closed section characteristics: The bending stiffness is increased by 50% -80% compared to H-beam, and the torsional stiffness is increased by 3-5 times;

Typical bearing capacity: The axial compressive bearing capacity of a single box column (800 × 800 × 30mm Q355B) is ≥ 40000 kN.

Excellent seismic and wind resistance performance

Uniform stress distribution across the cross-section reduces stress concentration at nodes by 30%;

Suitable for the core tube of super high-rise buildings in high-intensity zones (with a 9-degree fortification).

Flexible adaptation to complex designs

Customizable rectangular, trapezoidal, and polygonal cross-sections;

Internally, it can be filled with concrete (CFST) or reinforced with ribs to enhance overall performance.

Industrial production and rapid construction

Factory prefabrication rate ≥ 95%, on-site welding quantity reduced by 70%;

Maximum single segment lifting weight: 3000 tons (such as steel box girders for cross sea bridges).

2、 Core product series and technical parameters

Product type	Specifications and materials	Technical index	Typical application scenarios
Building Box Column	Section 600×600 to 2000×2000×20-50mm Q355GJC	Slenderness ratio λ ≤ 30, axial compression stability coefficient φ ≥ 0.9	Super high-rise core tube, conversion layer
Bridge steel box girder	Single box multi chamber section, top plate width 12-40m Q345qD	Anti torsion stiffness ≥ 2 × 10 ^ 6 kN · m ²/rad	Cross sea bridge, urban elevated bridge
Industrial heavy-duty platform	Box shaped main beam (H=1.2-3m), Q420A	Uniformly distributed load bearing capacity ≥ 50kN/m ²	Petrochemical pipe gallery, heavy-duty workshop
Composite box type components	Steel box+concrete filling (C60), bolted connection	Combination bending strength increased by 40%	Large span spatial structures and corridors
Irregular cross-section box	Trapezoidal/hexagonal cross-section, cold-formed Q355B	Local buckling critical stress ≥ 0.8 σ y	Artistic building skin and curtain wall support

3、 Key Design and Manufacturing Technologies

section optimization design

Reinforcement rib arrangement:

The spacing between transverse stiffeners should be ≤ 600mm to prevent buckling of the web plate;

The height of the longitudinal stiffeners is ≥ 0.1h (h is the height of the web plate).

Partition design:

The thickness of the internal bulkhead should be ≥ 12mm, with a spacing of ≤ 3m, to ensure the integrity of the cross-sectional closure.

Precision manufacturing process

Assembly of board units:

Laser positioning assembly, misalignment ≤ 1mm/10m;

Four wire submerged arc welding (SAW) is used to form a 50mm thick plate weld in one go.

Cold bending forming technology:

Cold bending radius ≥ 15 times plate thickness (anti cracking), angle deviation ≤ 0.5 °.

Welding and Testing

Full penetration weld:

Groove form: K-type/U-shaped, blunt edge height 2-4mm;

Welding sequence: Symmetrical welding, controlling deformation ≤ 3mm/m.

Non destructive testing:

100% ultrasonic testing (UT)+10% radiographic sampling (RT);

Magnetic particle testing (MT) for all T-joints.

Anti corrosion and fire prevention system

Long term anti-corrosion:

Hot spray aluminum (200 μ m)+epoxy sealing paint (80 μ m), salt spray resistance ≥ 20000 hours;

Fire protection:

Thick fireproof coating (thickness 25mm) with a fire resistance limit of ≥ 3 hours (GB 14907).

4、Quality Inspection and Certification

Testing items	Standards and Methods	Qualified indicators
Geometric dimensions	GB/T 19879-2015	Cross section height deviation ≤ ± 2mm, verticality ≤ 1/1000
welding quality	AWS D1.1/D1.5	UT inspection level I, RT inspection level II
Coating performance	ISO 12944 C5-M	Total dry film thickness ≥ 280 μ m, adhesion ≥ 5MPa
Fire resistance test	GB/T 9978.1-2008	3-hour fire resistance limit, temperature rise on the back fire surface ≤ 140 ℃
Fatigue performance	EN 1993-1-9	No crack propagation under 2 million cycles of load

5、Intelligent construction and operation

BIM digital delivery

LOD 400 precision model: including manufacturing data such as weld seam number and inspection records;

Construction simulation: Collision detection reduces on-site rework rate by 30%.

Health monitoring system

Sensor network:

Strain gauges: monitor the stress distribution of key sections;

Tiltmeter: Real time feedback of structural deformation.

AI warning platform:

Automatic alarm for abnormal data and location of damage (accuracy ± 0.5m).

Maintainability design

Maintenance channel: An 800 × 1200mm maintenance port is reserved inside the box;

Modular replacement: Partial damage can be cut and replaced without the need for overall dismantling.

Contact

Mobile number: 13848510731

Landline number: 0471-6490861

Address: Inside the courtyard of the Outer Transport Company, diagonally opposite the government of Haoqinying Town, Xincheng District, Hohhot City, Inner Mongolia (National Highway 110)