What Is Steel Piling Pipe

Steel Piling Pipe is a deep foundation support structure used in buildings, Bridges and Marine engineering, driven vertically or rotationally into the earth to carry loads and stabilize the foundation. The following is a comprehensive analysis combining industry standards, process characteristics and practical applications:

1. Basic composition:

• Made of carbon steel or low alloy steel, common manufacturing processes include spiral welding (SSAW), straight seam welding (LSAW) and resistance welding (ERW).
• Typical specifications: Outer diameter 250-1500mm, wall thickness 8-25mm, length up to 12 meters or more, in accordance with EN10025 (such as S355/S275 class) or ASTM A252 (Gr1-Gr3 class) standards.

2. Innovative design:

• Spiral retaining member: The inner wall is designed with continuous or intermittent spiral structure to prevent soil blockage and enhance the friction between the pile and the soil layer (see diagram in Figure 1).
• Liquid injection system: A liquid supply pipe is placed in some piles, and lubricants or curing agents are sprayed through the tip of the piles during construction to optimize the pressing resistance and foundation stability.

1. Excellent mechanical properties:

• High compressive and bending strength, suitable for hard soil or rock geological conditions, such as the South American bridge project 609mm×9.52mm specification pile pipe can withstand more than 100 tons of loads.
• Small roundness error (<1%) to ensure the pile perpendicularity and construction accuracy.

2. Construction efficiency and economy:

• The welding interface is standardized, the connection is fast, and the construction period can be shortened by 30% compared with the traditional concrete pile.
• The cost is 15%-20% lower than U/Z steel sheet pile, and can be recycled, in line with the green construction trend.

3. Corrosion resistance:

• Use 3PE anti-corrosion coating, galvanized or epoxy powder coating technology to extend the service life of Marine environments (such as ports, breakwaters) to more than 50 years.

1. Construction Project:

• Deep foundation of high-rise buildings: for example, ASTM A252 Gr2 spiral steel pipe piles are used in Guyana project to ensure the bearing capacity of soft soil foundation.
• Subway support wall: multiple piles and pipes interlock to form a continuous retaining wall to prevent foundation pit collapse.

2. Transportation and Energy Engineering:

• Bridge piers across the sea: The Argentine project uses ERW steel pipe piles (ASTM A252 Gr3) as the foundation of the piers to resist tidal erosion.
• Offshore wind platforms: large-diameter piles (e.g. 1500mm) are embedded in the seabed to provide anti-overturning support for the wind turbine.

3. Special environment:

• Liquefaction soil reinforcement: The foundation is improved by in-pile grouting techniques, such as the rotary pressing method with liquid curing agent described on page 3.

1. Production process:

• Spiral welded pipe (SSAW) : hot rolled steel strip spiral welded, suitable for large diameter pile pipe (such as the EN10025 standard product in page 1).
• ERW high frequency resistance welding: high production efficiency, low cost, suitable for small and medium caliber standardized production (such as 609mm ERW pile pipe of Xinyue Steel).

2. Construction method:

• Vibration hammer: Traditional construction method, suitable for loose soil.
• Rotary pressing: Through the pile end spiral structure to reduce the disturbance of the surrounding soil, suitable for construction in sensitive urban areas.

Steel Piling Pipe has become the core supporting element of modern infrastructure through material innovation and process upgrading, and the selection needs to be integrated with geological conditions, load requirements and anti-corrosion requirements.