Sheet Piling
Interlocking steel sheets driven to create continuous retaining walls and cofferdams.
Sheet piling consists of interlocking steel sections driven into the ground to form a continuous wall for earth retention, water exclusion, or structural support. Individual sheets connect via ball-and-socket or thumb-and-finger interlocks that allow the wall to flex while maintaining water-tightness. Sheet pile walls are used for temporary excavation support (cofferdams, shoring), permanent waterfront structures (bulkheads, seawalls), flood protection, and below-grade parking or utility construction. Materials include hot-rolled steel (Z-sections, U-sections), cold-formed steel, vinyl, and fiberglass composite. Steel sheet piles are the most common for structural applications, with section moduli ranging from 10 to 200+ in³/ft depending on profile. Installation methods include vibratory driving (most common), impact driving, and press-in (silent) methods for urban environments.
Technical Specifications
Common Applications
Installation Process
- 1Survey and mark wall alignment; set template or guide frame
- 2Position first sheet pile pair using crane; check plumb and alignment
- 3Drive sheets using vibratory hammer to design tip elevation
- 4Thread subsequent sheets into interlock of previously driven sheet
- 5Continue driving sequence along wall alignment
- 6Install wale beams, tiebacks, or bracing as excavation proceeds
- 7Seal interlocks if water-tightness is required (sealant or welding)
- 8Complete cap beam or coping for permanent installations
Frequently Asked Questions
How deep can sheet piles be driven?
Sheet piles are routinely driven to depths of 40–80 feet. Maximum depth depends on soil conditions, hammer energy, and sheet pile section strength. In soft soils, depths of 100+ feet are achievable.
Can sheet piles be removed and reused?
Yes — steel sheet piles used for temporary applications (cofferdams, shoring) are commonly extracted and reused on multiple projects. Extraction is performed using vibratory hammers.
What is the difference between vibratory and impact driving?
Vibratory hammers use high-frequency vibration to reduce soil friction, allowing sheets to slide into place. Impact hammers deliver discrete blows. Vibratory is faster and quieter but less effective in dense soils or for achieving high tip resistance.
Are sheet pile walls watertight?
Standard interlocks allow some seepage. For water-tight applications, interlocks can be sealed with bituminous sealant, polyurethane, or welded. Vinyl and composite sheets offer better inherent water-tightness.
How long do steel sheet piles last?
In non-marine environments, steel sheet piles last 50–100+ years. In marine/splash zone conditions, corrosion rates of 0.001–0.003 inches per year per side are typical. Coatings, cathodic protection, or added sacrificial thickness extend service life.
What is a cofferdam?
A cofferdam is a temporary enclosure built in water (or water-bearing soil) to create a dry work area. Sheet pile cofferdams are the most common type, consisting of interlocking sheets driven to form a closed perimeter, then dewatered.
Can sheet piles be installed without vibration?
Yes — hydraulic press-in methods (like the Giken Silent Piler) install sheets by pressing them in using previously installed sheets as reaction. This is ideal for urban areas where vibration must be minimized.
What is the cost difference between temporary and permanent sheet pile walls?
Temporary walls cost $30–$80/sf because sheets are extracted and reused. Permanent walls cost $80–$200/sf because sheets remain in place, coatings are applied, and cap/coping structures are added.