Steel lattice columns are the core vertical load-bearing members in modern deep foundation pit support systems. They efficiently carry and transfer the vertical loads from steel struts and steel waling, optimizing the overall load distribution of the support system and ensuring structural stability throughout the entire excavation and basement construction cycle.
As a specialized manufacturer and supplier, we offer both standard and customized steel lattice column products. We can tailor specifications, material grades, and structural configurations based on different geological conditions, excavation depths, and project load requirements - empowering global underground engineering projects with professional customized structural solutions and helping clients overcome various complex foundation pit support challenges.
What Is a Lattice Steel Column?
Lattice steel columns are prefabricated open-lattice temporary steel structural members specifically developed for deep foundation pit support systems. They are connected by shop welding of multiple main angles and lacing bars, with full-penetration welds at chord splice joints and fillet welds at lacing connections. Distinct from traditional solid steel columns, their open lattice configuration significantly reduces self-weight while maintaining extremely high structural stiffness - making them the preferred temporary vertical support member for complex deep foundation pit projects.
Structural Composition
Main Members (Chords): Typically composed of four L-shaped angles, forming the four corners of the column.
Batten Plates / lacing Bars: Steel plates welded at regular intervals, ensuring that all main members act as an integral load-resisting unit.
Mainstream Materials: Primarily Q235B (carbon structural steel) or Q355B (low-alloy high-strength steel). For overseas projects, we also supply equivalent materials per ASTM A36/A572 Gr.50 or EN S235/S355 standards.
Core Structural Features: Open lattice configuration, low slenderness ratio, strong buckling resistance, light self-weight, high overall stiffness, convenient on-site assembly and cutting, and excellent temporary support stability.
Worried about Chinese steel compliance? Contact us for custom designs matching ASTM/EN standards with certified MTCs.
Working Principle of Lattice Column in Deep Excavation Support
Step-by-Step Load Transfer and Stability Assurance
Steel lattice columns serve as the core vertical members of the entire deep foundation pit support system. Working in coordination with bored cast-in-place piles, steel struts, and steel waling, they form a complete, closed-loop load-resisting system for the excavation. Through pre-embedded anchorage installation, they act integrally with the support system, enabling step-by-step load transfer and overall structural stability.
Load Transfer Paths
Horizontal Loads: Earth pressure and water pressure → retaining wall (bored pile wall / diaphragm wall / soldier pile wall, depending on design) → steel waling and internal struts → lattice columns.
Vertical Loads: Self-weight of the support system + construction equipment loads → lattice columns → foundation piles.
Reducing the Slenderness Ratio
In deep foundation pits exceeding 10 m in depth, horizontal struts are highly susceptible to buckling under self-weight or axial compression. Lattice columns provide a rigid vertical support point that effectively reduces the unbraced length of horizontal members, thereby significantly enhancing the overall stability of the system.
Synergistic Effect with the Internal Bracing System
During staged excavation, as soil is progressively removed, lattice columns ensure that the steel struts and waling remain in their precise design positions at all times. They effectively prevent the bracing system from displacement or settlement caused by basal heave, thereby maintaining the structural integrity of the entire construction site.
Why Choose Lattice-type Columns for Deep Excavation Support Systems?
Superior Buckling Resistance
The optimized truss-type lattice configuration effectively reduces the slenderness ratio of vertical members. For the same steel tonnage, the optimized lattice configuration distributes material farther from the centroidal axis, increasing the radius of gyration and reducing the slenderness ratio. This typically achieves 20%-30% higher buckling capacity per unit weight compared to solid sections of equivalent
tonnage.
Significant Weight Reduction
The open-lattice welded design reduces the self-weight of lattice columns by 30%–45% compared to solid members under the same compression rating. This effectively decreases the vertical additional stress on the underlying pile foundations, facilitating settlement control performance that meets project-specific design limits under typical geological conditions.
Higher Construction Efficiency
Lattice columns adopt a fully shop-fabricated, integral on-site lifting construction mode - eliminating the need for secondary on-site cutting and complex welding operations required by traditional solid steel columns. This can significantly shorten the vertical support construction period
compared to cast-in-place concrete columns.
Outstanding Cost-Effectiveness
As removable temporary support members, steel lattice columns are easy to cut and dismantle after construction. Compared with concrete columns, they can save nearly 40% in material waste and post-construction demolition costs. Their modular custom configuration enables reuse across multiple projects, further reducing the comprehensive construction cost of deep foundation pit support systems.
Typical Applications of Lattice-type Steel Column
Super High-Rise Buildings and Multi-Level Basement Excavation Projects
For projects with 3 to 6 levels of basement, excavation depths typically exceed 15–25 m. Lattice columns serve as "soldier pile" supports, carrying the multi-level horizontal steel strut system.
Top-Down Construction Method Projects
In urban centers with tight schedules and constrained sites, the top-down construction method is widely adopted. Steel lattice columns are the core vertical load-transfer members in this method, working in coordination with the floor slab structure and the internal bracing system to enable simultaneous construction of below-grade and above-grade structures.
Soft Soil and Complex Geological Excavation Projects
Primarily used in foundation support for subway stations, pumping stations, and bridge foundations near water bodies. The lightweight characteristics of lattice columns significantly reduce the additional pressure on soft bearing strata, ensuring that the excavation does not experience settlement or displacement.
Long-Span and Irregular Excavation Projects (Subway and Transit Hubs)
For large-area, long-span, and irregularly shaped excavations, customizable steel lattice columns can be flexibly adjusted in specification, height, and structural configuration according to the excavation layout and span - enabling precise positioning of support points.
🚇Facing heavy loads in top-down construction? Contact us for heavy-duty hybrid lattice columns customized to your site.
Lattice Column vs. Solid Steel / Concrete Column for Deep Excavation Support
In practical deep foundation pit support systems, steel lattice columns, solid steel columns, and concrete columns are the three mainstream vertical support solutions. The selection of vertical support members not only determines the overall construction safety of the foundation pit but also directly impacts project cash flow, construction schedule, and overall project profitability. As a specialized steel structure supplier, to help overseas engineering teams quickly complete project selection and optimize support schemes, the following is a comprehensive engineering selection comparison:
| Factor | Steel Lattice Column | Solid-Wall Steel Column | Reinforced Concrete Column |
|---|---|---|---|
| Buckling & Stability | Superior: Large radius of gyration, favorable slenderness ratio, and strong resistance to instability. | Moderate: Weak axis present; prone to overall or local buckling when excessively long. | High: High stiffness, but limited by second-order effects (P–Δ) caused by excessive self-weight. |
| Self-Weight & Foundation Impact | Lowest: Open lattice structure reduces axial load on pile foundation and performs well in soft soils. | High: Large self-weight imposes high demands on local bearing and axial deformation of the bottom pile foundation. | Extreme: Massive self-weight easily causes differential settlement of piles and redistribution of internal forces. |
| Construction Period | Fastest: 100% shop-prefabricated; lowered directly on site after fit-up; supports top-down construction. | Moderate: Shop-prefabricated, but extensive on-site welding and NDT work for multi-segment connections. | Slowest: Requires on-site formwork, rebar tying, and concrete placing, plus reliance on a 28-day curing period. |
| Site Space Usage | Optimal: Open lattice structure facilitates vertical soil removal and excavation operations. | Obstructive: Solid cross-section occupies space and somewhat hinders soil hauling efficiency. | Bulky: Large cross-sections seriously obstruct basement excavation machinery operations. |
| Removal & Recycling | Excellent: Easy cutting and lifting; recycling rate exceeds 70%-80%. | Good: Fast dismantling; high scrap value of steel, but high initial capital tied up in procurement. | Poor: Must be demolished mechanically; cannot be reused; high muck hauling costs. |
| Overall Cost | Economic: Significantly saves schedule, logistics, and later-stage demolition costs. | Premium: High steel tonnage leads to high upfront procurement and heavy-lift direct costs. | Hidden Costs: Materials are inexpensive, but labor, schedule delays, and demolition costs are high. |
| Best Application Scenarios | Deep excavations (>10 m), top-down method, soft soil foundations, and tight-schedule projects. | Medium-shallow excavations; vertical load-bearing members for temporary steel bracing systems. | Shallow excavations, slope-cut support, or "temporary-permanent combined (beam-column integrated)" projects. |
💰Suffering from high demolition costs and delays? Contact us to shorten schedules by 25% and save 40% with reusable columns.
Installation & Quality Control of Lattice Steel Column for Deep Excavation Support
1. Precision Factory Fabrication
Material Certification: All steel angles and plates are supplied with Mill Test Certificates (MTCs) and manufactured in accordance with project requirements, typically complying with ASTM A572 Grade 50 or EN 10025 S355JR, ensuring full material traceability and structural reliability.
Precision Assembly: Dedicated welding jigs are used throughout fabrication to maintain accurate geometry and chord alignment, with dimensional tolerances controlled within ±2 mm.
Staggered Splice Design: Main chord splice joints are staggered (typically 300-500 mm per project specifications) to reduce stress concentration and enhance the overall buckling resistance of the lattice column.
2. Critical Installation Controls
King Post Integration: The steel lattice column is accurately positioned and embedded into the bored pile reinforcement cage to form a rigid King Post. The embedment depth is determined by structural design requirements, typically ranging from 2.5–3.0 m.
Verticality Control: During lifting and installation, column verticality is continuously monitored using surveying equipment such as total stations or digital theodolites to maintain a vertical deviation within 1/200 per GB 50202-2018; column deflection within 1/500.
3.Quality Acceptance Standards
| Inspection Item | Tolerance | Inspection Method |
|---|---|---|
| Section Dimensions | ±5 mm | Steel Ruler |
| Column Length | ±50 mm | Steel Tape |
| Verticality | ≤1/200 (Standard) | Theodolite / Total Station |
| Batten Plate Spacing | ±20 mm | Steel Ruler |
How to Select the Right Steel Lattice Column for Your Project?
Selecting the optimal steel lattice column (main column) is a rigorous engineering decision that directly impacts the structural integrity and economic performance of the deep foundation pit support system. To guide your project procurement and engineering design, our technical team evaluates the following four core parameters in strict accordance with international standards (AISC, Eurocodes).
Selection by Excavation Depth
Medium-shallow foundation pits (≤10 m): Q235B standard steel lattice columns
Medium-deep foundation pits (10-18 m): Enlarged cross-section lattice columns with optimized slenderness ratio
Ultra-deep foundation pits (>18 m): Q355B high-strength lattice columns preferred
Selection by Support Load
For conventional foundation pits with simple layouts and lighter loads: standard four-angle steel lattice columns
For medium-to-high load projects with large spans and multi-level transitions: upgraded main chord specifications
For ultra-deep foundation pits with extremely high loads: custom reinforced structural configurations
Selection by Geological Conditions
For stable geological conditions such as hard soil and rock strata, standard lattice configurations with conventional anti-corrosion treatment are suitable.
For complex geological conditions such as soft soil,silt, and coastal saline-alkali soil ,Q355B high-stiffness lattice columns with upgraded anti-corrosion systems should be selected to ensure long-term foundation pit stability.
Selection by Construction Technology
For conventional open-cut bottom-up construction projects, standard specifications are suitable.
For top-down construction projects, high-strength, high-stiffness custom lattice columns should be selected to accommodate the simultaneous above-grade and below-grade construction conditions.
Selection Recommendations by Project Type
| Project Type |
Recommended Material |
Structure Type |
Typical Dimensions |
|---|---|---|---|
| High-Rise Basement |
Q355B / S355JR (ASTM A572 Gr.50) |
4-Angle Steel Lattice |
460 mm x 460 mm / 500 mm x 500 mm |
| Subway/Metro Station |
Q355B / S355J0 (High-Stiffness Steel) |
Heavy-Duty 4-Angle |
460 mm x 460 mm / 560 mm x 560 mm |
| Soft Soil Trenching |
Q235B / S235JR (Mild Carbon Steel) |
Standard 4-Channel |
300 mm x 300 mm / 350 mm x 350 mm |
| Top-Down Construction |
Custom Q355C/D / S355J2 (Impact-Tested Steel) |
Reinforced Hybrid / H-Beam |
Customized per Load |
🧐Project depth, complex soil conditions, or heavy strut loads making lattice column configuration difficult?
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Why Choose Our Custom Lattice Steel Columns?
Selecting the right supplier is just as important as selecting the right steel lattice column. As a specialized steel structure supplier, we not only provide high-quality steel lattice column products but also offer one-stop engineering solutions for global deep foundation pit projects - from design optimization and custom fabrication through to international delivery - helping contractors, EPC firms, and project owners achieve safer and more efficient construction.
1.Engineering Support & Custom Fabrication
Our engineering team can assist clients with drawing detailing, node optimization, and fabrication drawing design. Based on the finalized drawings, we can custom-fabricate steel lattice columns in various non-standard dimensions, irregular geometries, special cross-sections, and dedicated connection nodes - ensuring a high degree of matching between products and project requirements.
2.Compliance with Global Standards
Our products can be manufactured in accordance with international standards such as ASTM, EN, BS, and AS/NZS. Complete quality documentation can be provided per project requirements, ensuring smooth acceptance for overseas engineering projects. Specific documents include:
Mill Test Certificate (MTC)
WPS (Welding Procedure Specification)
Welder qualification certification
NDT (Non-Destructive Testing) reports (UT, MT, PT, etc.)
Dimensional inspection report
3.High-Precision Fabrication & Strict Quality Control
From raw material inspection to precision fabrication, welding inspection, dimensional verification, surface treatment, and final inspection, every steel lattice column is produced under a comprehensive quality control system to ensure consistent performance and installation accuracy.
4.Professional Technical & Installation Support
We provide comprehensive technical support throughout your project. Our team assists with drawing review, fabrication recommendations, installation guidance, and technical documentation to help ensure efficient on-site assembly and smooth project execution.
Packing & Delivery of Our Structural Steel Lattice Columns
Bundling Method: Medium-sized lattice sections are securely bundled using heavy-duty steel straps or welded transport frames.
Cushioning: EPE foam or rubber pads are placed between stacked chords to prevent surface wear and displacement.
Accessories Packaging: Bolts, stiffener plates, and small connection hardware are packed in labeled steel cases or shrink-wrapped pallets.
Corrosion Protection Treatment: Strapping bars and exposed node connections are coated with anti-rust primer or hot-dip galvanizing before packaging.
Contact now to get steel lattice columns
| Description | Structural Steel Lattice Columns |
| Material |
Q235B, Q355B, Q355D, Q355E, S235JR, S355JR, S355J0, S355J2, ASTM A36, A572 Grade 50
|
| Standard | ASTM, AISC, EN 1090-2, AS/NZS 1554, GB/T 1591,EN 10025 |
| Metal Processing | CNC Cutting, Automated Submerged Arc Welding (SAW), GMAW-CO2 (MAG welding), Drilling, Sandblasting |
| Certification | ISO 9001:2015, CE (EN 1090), AWS Welder Qualification, SGS/BV Factory Audit |
| Application | Industrial Workshops, Warehouses, Transmission Towers, Mining Infrastructures, Bridge Supports,Deep Excavation Support Systems, Foundation Pit Bracing,Top-Down Construction |
| Machining precision | According to ISO 13920 class B or specified project requirements (typically ±2mm) |
| Surface treatment | Hot-Dip Galvanized (ISO 1461), Epoxy Zinc-Rich Primer, Polyurethane Topcoat,Sa 2.5 Shot Blasting |
| Transport | Sea Freight (40'OT/FR Container) or Bulk Carrier |
| Design Support | Tekla Structures (3D Modeling), AutoCAD (Shop Drawings) |
| Packing details | Standard package/Pallet or Container/As per customized specifications |
| MOQ | Small order is accepted |
FAQ:
Why distinguish between lacing bar columns and batten plate columns for lattice columns?
Lacing Bar Type. Diagonal members (such as single angles) are used to form triangular systems, offering clear load transfer paths and minimal shear deformation. This type is suitable for columns with heavier loads and wider chord spacing.
Batten Plate Type. Transverse steel plates are rigidly connected to the chords, resulting in a regular appearance and simpler fabrication. However, due to greater shear deformation, the equivalent slenderness ratio must be introduced in the calculation of the virtual axis.
When should lattice columns be used versus solid-web H-section steel columns?
Choose lattice columns when the structure has large spans, significant heights, or is subjected to substantial lateral forces or heavy-duty crane loads (typically 20 tonnes and above,depending on span and height). In such cases, solid-web columns would require excessively large cross-sections and become uneconomical, whereas lattice columns can deliver extremely high flexural stiffness at a much lower self-weight.
Choose solid-web columns for conventional small to medium-sized buildings, mill buildings with lighter loads, or where space is limited. Solid-web H-section steel columns offer simpler fabrication, easier corrosion protection, and more straightforward connection detailing.
Can steel lattice columns be customized for irregular or non-standard excavation dimensions?
Yes. We support full-dimensional non-standard customization, including column height, cross-sectional specifications, main chord angle size, lacing bar spacing, and anti-corrosion rating - all adjustable on demand. All custom products strictly conform to AISC 360-16 and EN 1993-1-1 (Eurocode 3), perfectly adapting to irregular, large-span, and complex deep foundation pit support systems worldwide.
Are steel lattice columns suitable for soft soil and complex coastal geological conditions?
Yes, they are highly suitable. Compared with solid steel columns and concrete columns, steel lattice columns offer lighter self-weight, higher stiffness, and superior settlement control capability. When combined with Q355 high-stiffness material and upgraded anti-corrosion treatment, they can effectively resist differential settlement in soft soils and salt spray corrosion in coastal environments - making them the optimal temporary steel structural support solution for foundation pits in complex geological conditions.
Do you provide construction technical guidance for overseas projects?
Yes. We provide full-process cross-border technical support, including preliminary support scheme optimization, construction drawing verification, installation parameter guidance, and remote technical coordination - a one-stop service that assists overseas construction teams in standardized installation, optimized construction processes, and improved construction quality and stability of the entire deep foundation pit support system.