Steel Sheet Piling Sections
1986 Edition

IS 2314 defines three main profiles for steel sheet piling: Z-type, U-type, and flat-type sections. Each profile is assigned a designation combining 'ISPS', the section modulus in cm³ per meter, and a letter representing the profile type (Z, U, or F). Dimensions such as depth, width, and thickness are specified for hot-rolled piles with defined tolerances. Typical ranges include depths between 400-600 mm, widths around 150-200 mm, and thicknesses from 6 to 12 mm. Detailed tables in the standard provide exact measurements and permissible variations.

Dimensional tolerances for width, height, and thickness of steel sheet piles are specified in Table 5 of IS 2314 (Clause 6.1). Width and height tolerances typically range around plus or minus 3 mm, while thickness tolerances vary between ±0.2 mm and ±0.3 mm depending on the actual thickness. Interlock dimensions at pile joints are controlled by Table 6 tolerances to ensure proper fit and watertight joints. The clutch dimension is left to the manufacturer's discretion and is not standardized.

Surface imperfections that do not impair structural performance are allowable provided the sheet piles remain straight and have flat, smooth surfaces. Minor defects can be corrected by grinding, with the depth of grinding limited to the negative thickness tolerance. More substantial defects may require welding repairs, which must follow strict criteria such as complete removal of defective material, a maximum repair depth of 20% of the parent metal thickness, and the total repair area not exceeding 2% of the pile surface. Repairs must ensure the integrity and flatness of the surface.

The tensile strength of joints, especially for flat-type sheet piles made from IS 226-1975 steel, must not be less than 400 tonnes per meter, as per Clause 9.1. For other steel grades, the joint strength should be agreed upon between the purchaser and manufacturer. Welding repairs on joints must be sound, with a minimum excess weld thickness of 1.5 mm which is then ground flush to ensure a smooth finish, maintaining joint integrity and load transfer capacity.

Key sectional properties to consider include the mass per meter (kg/m), mass per square meter of wall, section modulus (cm³ per meter), moment of inertia (cm⁴ per meter), sectional area (cm² per meter), and the perimeter length (cm per meter). These parameters influence the pile's bending strength, stiffness, axial load capacity, and durability. Selecting a section with appropriate properties ensures the piling will withstand the structural demands of the project such as bending moments and soil pressures.