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Help CenterSteel Sheet & Plate & Steel Sheet Pile，Q355B、SY295、SY390、Q355B/Q355NL、Q235B、Q420P
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1. Product Overview
Steel sheet piles (also known as Larsen sheet piles) are hot-rolled or cold-formed steel components with special interlocking clutches on both edges. Each single pile interlocks tightly with adjacent ones to form a continuous watertight retaining wall for soil and water blocking. They serve as core supporting and anti-seepage materials in civil engineering, water conservancy and port projects, applicable to both temporary construction enclosures and permanent hydraulic structures. Production complies with national standards GB/T 20933-2021 Hot-Rolled Steel Sheet Piles and JG/T 196-2018 Steel Sheet Piles.
2. Product Classification & Core Features
2.1 Classified by Manufacturing Process
(1) Hot-Rolled Steel Sheet Piles (Mainstream for Engineering, Larsen Piles)
Formed under high-temperature rolling with integrated clutches, featuring high assembly precision and excellent water sealing performance. Stable mechanical section properties deliver outstanding bending resistance against earth pressure, and they can be driven, extracted and reused repeatedly. Ideal for deep foundation pits, deep-water cofferdams and permanent quay walls with strict anti-seepage requirements.
Thickness: 10.5mm ~ 22mm
Standard lengths: 6m/9m/12m, customized maximum length up to 15m
Advantages: Clutches prevent sand and water leakage, resist deformation when driven into hard soil layers, long service life
(2) Cold-Formed Steel Sheet Piles
Rolled at normal temperature from thin steel plates with lower cost and flexible length customization. Drawbacks include wide clutch gaps leading to poor water tightness, and high risk of cracking for thick plates. Only suitable for shallow foundation trenches and short-term simple temporary support.
Thickness: 8mm ~ 14mm
Application: Small trenches and shallow earth temporary retaining walls
2.2 Classified by Section Shape
(1) U-Type Steel Sheet Piles (Most Widely Used in China)
U-shaped cross-section with symmetrical central clutches, low driving resistance and flexible assembly, complete full-size specifications for both temporary and permanent works.
| Model | Effective Width (mm) | Section Height (mm) | Web Thickness (mm) | Theoretical Weight (kg/m) | Application Scenarios |
|---|---|---|---|---|---|
| Larsen Type II | 400 | 100 | 10.5 | 61.2 | Shallow foundation pits, river embankments |
| Larsen Type III | 400 | 125 | 13.0 | 76.4 | Municipal foundation pits, bridge cofferdams |
| Larsen Type IV | 400 | 170 | 15.5 | 77.3 | Metro projects, deep foundation pits, river closure |
| PU600 | 600 | 210 | 18.0 | 105.0 | Large docks, deep-water cofferdams |
(2) Z-Type Steel Sheet Piles
Z-shaped cross-section with outward flanges, much higher section modulus and bending capacity than U-type piles of the same width. Wider single-panel coverage improves construction efficiency, with clutches at two ends. Suitable for deep water under high hydraulic pressure and heavy permanent retaining walls.
Typical models: PZ28, PZ35, PZ40
Application: Seaports, cross-sea cofferdams, high-fill permanent retaining walls
(3) Straight (Flat) Steel Sheet Piles
Flat plate surface with prominent clutch tensile performance, not optimized for bending resistance. Mainly used for circular cofferdams, honeycomb composite walls and anti-seepage curtains.
(4) Composite Steel Sheet Piles (H-Beam + Steel Sheet Pile)
Super-rigid composite walls bearing ultra-high lateral loads, exclusively applied to large ports and offshore wind power foundation marine projects.
3. Steel Grades & Mechanical Properties
3.1 Common Steel Grades
Q235B: Ordinary carbon steel, yield strength ≥235MPa. General choice for shallow foundation pits under normal temperature and short-term temporary projects with high cost performance.
Q355B/Q355NL: Low-alloy high-strength steel, yield strength ≥355MPa. Preferred for deep foundation pits, river projects and construction in low-temperature environments.
Q420P: High-strength special steel for hydraulic works, yield strength ≥420MPa. For deep-water docks, permanent cofferdams and projects in frigid regions.
3.2 Core Performance Indicators
Tensile strength: 375~600MPa
Elongation after fracture ≥19%, excellent toughness to avoid brittle fracture during pile driving
Wear-resistant clutches for repeated interlocking, reusable for 5~8 times
Custom anti-corrosion surface treatments available: black anti-rust paint, coal tar epoxy coating, hot-dip galvanizing
4. Core Product Advantages
Excellent Water & Seepage ResistanceIntegrated hot-rolled clutches interlock tightly; water-stop putty can be filled into gaps to block underground water and quicksand completely, eliminating foundation pit leakage and piping.
High Construction Efficiency & Short Construction PeriodRapid driving and extraction with vibratory hammers; no large-area excavation support or concrete curing cycle required, significantly shortening civil construction schedules.
Reusable & Low Comprehensive CostIntact extraction after project completion allows secondary reuse with no construction waste, eco-friendly and cost-saving; greatly reduces sand, stone and cement consumption compared with concrete retaining walls.
Small Footprint & Strong Site AdaptabilityThin cross-section results in narrow retaining walls, suitable for narrow urban areas, utility tunnels and construction adjacent to existing buildings with limited space.
Outstanding Emergency Rescue PerformanceFast pile driving for flood control, landslide containment and foundation pit water burst blocking; easy installation and removal for emergency water interception.
Superior DurabilityBare steel lasts 5~10 years underwater; hot-dip galvanized anti-corrosion treatment extends service life to 20~30 years, meeting requirements of permanent hydraulic structures.
5. Full-Range Application Scenarios
5.1 Municipal & Building Engineering (Temporary Support)
Deep foundation pit enclosure for high-rise building basements and underground parking lots
Retaining & water-stopping walls for metro stations, tunnels and comprehensive utility tunnels
Temporary support for municipal pipe trenches and rainwater channels
5.2 Water Conservancy & River Projects
River dredging, widening, slope protection and flood dike reinforcement
Cofferdams for bridge pier construction, river closure and reservoir anti-seepage walls
Flood control emergency interception barriers in waterlogged areas
5.3 Port & Waterway Engineering (Permanent Structures)
Quay walls for seaports and inland river ports, dry docks and channel revetments
Artificial islands, cross-sea projects and cofferdams for offshore wind power foundations
5.4 Transportation & Special Engineering
Slope reinforcement for expressway and railway roadbeds
Anti-seepage tanks for sewage treatment plants and retaining walls for tailings ponds
Enclosure walls for underground utility tunnels and underpass tunnels
6. Production, Delivery & Packaging Instructions
Custom SizesStandard lengths: 6/9/12m; customized lengths available from 3m to 15m. Regular stock widths: 400/500/600mm; special profiles can be produced on order.
Surface TreatmentStandard factory finish: sprayed black anti-rust paint; optional hot-dip galvanizing and epoxy anti-corrosion coating for marine corrosive environments.
Delivery CycleRegular stock specifications: Shipment from Tianjin Port within 5-7 days.
Packaging & TransportationBundled and fixed with steel strips with lifting lugs for hoisting. Truck delivery directly to factories; sea transportation via containers or bulk carriers for export, complete with material certificates and factory inspection reports.
Inspection StandardsFull factory inspection implemented in accordance with national standards, including dimensional tolerance, tensile test, bending test and clutch assembly precision test. Original quality guarantee certificates provided.
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