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Help CenterSteel Sheet & Plate & Steel Sheet Pile，PU22、PU28、PU32、PU40、FSP-Ⅲ、FSP-Ⅳ、PZ28、PZ35、PZ40、AZ
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1. Product Overview
Steel sheet piles are hot-rolled or cold-formed special-shaped steel products with precision interlocking clutches on both sides. They are interlocked and spliced together via clutches to form continuous soil-retaining and water-sealing walls. Widely applied in temporary support, permanent hydraulic and foundation pit projects, they feature high strength, excellent water tightness and recyclability, serving as core enclosure materials for geotechnical and port engineering.
2. Product Classification by Production Process
2.1 Hot-Rolled Steel Sheet Piles (Main Engineering Product, Larsen Piles)
Executive Standard: GB/T 20933-2021
Process: Integrally formed by hot rolling steel billets at over 1100°C. The clutches fit tightly with strong section toughness, resistant to driving and extraction without easy tearing.
Application Scenarios: Deep foundation pits, deep-water cofferdams, docks, permanent retaining walls and heavy-load hydraulic projects.
Main Sections: U-type (Larsen), Z-type and straight-web type.
Common Grades: Q355B, Q390B, Q420B, SY295, SY390, S355GP, A690 (special marine anti-corrosion grade).
2.2 Cold-Formed Steel Sheet Piles
Executive Standard: GB/T 29654-2013
Process: Rolled and formed at normal temperature with 8–14mm steel plates, featuring low cost and flexible fixed lengths.
Disadvantages: Poor clutch sealing performance, prone to cracking under heavy loads.
Application Scenarios: Shallow foundation pits, municipal trenches and short-term temporary support.
Common Grade: Q235B, Q355B.
3. Main Section Models and Characteristics
3.1 U-Type Steel Sheet Piles (Larsen Piles, Most Widely Used in Market)
Structure: U-shaped cross-section with centered clutches, enabling stable spliced walls and outstanding water sealing performance.
Representative Models: PU22, PU28, PU32, PU40, FSP-Ⅲ, FSP-Ⅳ (Larsen Type 3 & 4).
Advantages: High versatility, applicable to shallow & deep foundation pits, bridge cofferdams and river regulation.
Applications: Municipal deep foundation pits, bridge bearing platform cofferdams, river embankment protection and temporary water-stop enclosures.
3.2 Z-Type Steel Sheet Piles
Structure: Symmetric flanges with large section modulus, far superior bending and torsional bearing capacity compared with U-type piles, supporting heavy single-pile loads.
Representative Models: PZ28, PZ35, PZ40, AZ Series.
Advantages: Suitable for high earth pressure, deep water and permanent hydraulic structures.
Applications: Port docks, deep-water shipyards, large-scale land reclamation and permanent flood control walls.
3.3 Straight-Web Steel Sheet Piles (Flat Plate Type)
Structure: Flat plate surface with high tensile strength clutches.
Advantages: Capable of splicing circular and cellular box cofferdams.
Applications: Large shipyards, circular foundation pits and underground comprehensive pipe galleries.
3.4 L-Type Thin Sheet Piles
Lightweight cross-section with small floor space and convenient construction; only used for shallow trenches and small slope support.
4. Material Grades and Executive Standards
4.1 Domestic GB Standards
Q235B: Cold-formed thin sheet piles for lightweight temporary projects.
Q355B / SY295: General hot-rolled U-type piles for conventional foundation pit and river projects.
Q390B / SY390: High-strength grade for deep foundation pits and high-water-head cofferdams.
Q420B: Ultra-deep and heavy-load large hydraulic projects.
A690: Marine steel sheet piles resistant to seawater corrosion for docks and coastal permanent structures.
4.2 International Export Standards
European Standard EN10248/EN10249: S235JR, S275JR, S355J2, S430GP
Japanese Standard JIS A5523: SY295, SY390
American Standard ASTM A328, A690M
4.3 Conventional Dimension Parameters
Effective Width: 400mm, 500mm, 600mm, 700mm
Web Thickness: 8mm–24mm
Standard Fixed Length: 6m, 9m, 12m, 15m, 18m; customized lengths from 6m to 24m are available.
Weight per Meter: 30–120kg/m; special-shaped sizes can be customized per drawings.
5. Surface Treatment Options
Black Mill Finish (Standard Factory Delivery): Lowest cost, for short-term temporary projects; anti-rust paint can be applied on site before construction.
Anti-Rust Primer Coating: Grey or red epoxy primer for short-term outdoor anti-corrosion.
Hot-Dip Galvanizing: Zinc coating thickness 80–120μm for permanent anti-corrosion in humid and seawater environments.
Custom Heavy-Duty Anti-Corrosion Coating: Epoxy coal tar pitch and polyurethane coatings for high-corrosion river channels and seawater docks.
6. Core Product Advantages
Excellent Water Sealing Performance: Tightly extruded precision clutches can block underground water without extra anti-seepage materials, delivering stable anti-seepage effect for high-water-level projects.
Efficient Construction & Small Footprint: Rapid driving and extraction by vibratory hammers without extensive earth excavation, highly suitable for narrow construction sites and urban municipal works.
Reusable & Recyclable: Can be completely pulled out after construction without material loss; hot-rolled piles can be reused 15–20 times to greatly reduce overall project cost.
High Strength & Wide Geological Adaptability: Can be driven into sand, clay and gravel layers; matching multiple supports enables foundation pit excavation depth over 12m.
Eco-Friendly & Recyclable: 100% recyclable steel without concrete construction waste, shortening project construction period.
Flexible Forming: Can be assembled into straight, curved, square and circular cofferdams to meet construction demands of special-shaped foundation pits and river bends.
7. Full-Scope Application Scenarios
7.1 Municipal & Construction Engineering
Urban deep foundation pits, underground parking lots, metro stations, pipe gallery trenches and temporary support for old community renovation.
7.2 Water Conservancy & River Engineering
River embankment protection, flood control walls, cofferdams for river dredging, temporary water stop for reservoirs and flood retaining barriers in waterlogged areas.
7.3 Marine & Port Engineering
Port quay walls, shipyards, land reclamation, breakwaters and temporary enclosure for offshore platforms.
7.4 Road & Bridge Infrastructure
Deep-water cofferdams for bridge bearing platforms, pier foundation pits and slope reinforcement of expressways.
7.5 Emergency Temporary Works
Flood emergency water stop, emergency enclosure for foundation pit water gushing and temporary waterproof partitions on construction sites.
8. Supply, Packaging & Lead Time
Loading Port: Tianjin Port, direct delivery from domestic warehouses.
Production Lead Time: 5–7 days for regular stock; 7–10 days for customized special lengths or galvanized products.
Packaging: Bundled with steel strips, 2–5 tons per bundle; labels with model, material grade and length attached to pile ends, together with mill test certificates.
Supporting Qualifications: ISO9001, SGS, BV material inspection reports and factory mechanical property quality guarantee certificates.
Payment Terms: 30% TT advance deposit, balance settled before shipment; L/C letter of credit is not acceptable.
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