Temporary Retaining Structures Using Sheet Piles

You are building a new foundation or a basement. The excavation is deep, and the soil wants to collapse. You need a retaining structure that holds the ground, works fast, and can be removed when the job is done.

Temporary retaining structures using sheet piles¹ are the most common solution for excavations, basement construction, and underground utilities. Sheet piles are driven into the ground to form a continuous wall that holds back soil and water. After the permanent structure is built, the piles are extracted and reused on another project. They are fast to install, cost-effective, and 100% reusable.

I have supplied sheet piles¹ for temporary retaining structures² across the Middle East, Southeast Asia, and Africa. A metro project in Southeast Asia used temporary sheet piles¹ for a station box, then extracted them for reuse. A high-rise foundation in the UAE used temporary sheet piles¹ for a deep basement. Let me walk you through how temporary retaining structures² work.

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Sheet piling retaining wall

A sheet piling retaining wall¹ is a structure that holds back soil and water using interlocking steel sheet piles driven into the ground.

A sheet piling retaining wall¹ consists of interlocking steel sections driven vertically to form a continuous barrier. For temporary work, the wall is designed to resist soil and water pressure during construction. After the permanent structure is built, the piles are extracted using a vibratory hammer. The piles can be reused on multiple projects.

How Temporary Sheet Pile Walls Work

Let me explain the components and function of a temporary retaining wall.

Wall Components

• Sheet piles: Interlocking steel sections driven to depth
• Walers: Horizontal beams that distribute pressure
• Bracing: Struts or rakers that support the wall
• Tiebacks: Grouted anchors (for deep excavations)

Construction Sequence

1. Drive sheet piles to required depth
2. Excavate to first brace level
3. Install walers and bracing
4. Excavate to final depth
5. Construct permanent structure
6. Remove bracing
7. Extract sheet piles

Advantages of Temporary Sheet Pile Walls

• Fast installation
• Reusable (up to 10 times or more)
• No curing time (unlike concrete)
• Minimal ground loss
• Can be installed in tight urban sites

Temporary vs Permanent Walls

Feature	Temporary	Permanent
Design life	Months to years	50+ years
Corrosion protection	Minimal (allowance)	Coatings or marine grade
Reusability	Yes, multiple times	No
Cost per use	Lower (amortized)	Higher

My Experience
For a metro project, we used temporary sheet piles for the station excavation. After the concrete station was built, we extracted the piles and reused them on another station. The piles were used three times before being retired.

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Steel sheet piling retaining wall

Steel sheet piling retaining walls¹ are the standard choice for temporary excavations because of their strength, speed, and reusability.

A steel sheet piling retaining wall is made from hot-rolled or cold-formed steel sections with integral interlocks. The piles are driven using vibratory hammers for speed and minimal noise. For temporary work, standard carbon steel (ASTM A328) is used with minimal corrosion allowance. The wall is designed as a cantilever or anchored system depending on depth.

Design of Temporary Retaining Walls

Let me walk through the design considerations for temporary sheet pile walls.

Design Life²

• Temporary walls are designed for the construction period (typically 6-24 months)
• No corrosion allowance needed for short duration
• Standard carbon steel (A328, S270GP) is sufficient

Wall Types for Temporary Work

Depth	Wall Type	Typical Section
Up to 4 m	Cantilever	U 400 x 100
4-6 m	Cantilever	U 400 x 125
6-8 m	Cantilever or single brace	U 400 x 170
8-12 m	Braced or anchored	U 600 x 180 or Z-type
12-18 m	Braced or anchored	Z-type (AZ 26, AZ 34)

Bracing Options³

• Internal struts: Steel beams pushing against opposite walls
• Rakers: Diagonal braces bearing on a foundation or slab
• Tiebacks: Grouted anchors (require space behind wall)

Extraction Considerations⁴

• Piles should be driven with extraction in mind
• Vibratory extraction works for most soils
• Jetting or pre-drilling may be needed for hard soils
• Interlocks should be kept clean for easy extraction

My Experience
For a residential foundation in Australia, we used temporary sheet piles for a 5 m excavation. The U 400 x 125 piles were driven, the basement was built, and the piles were extracted in one day. The client reused the piles on another project.

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Sheet pile retaining wall cost

Sheet pile retaining wall cost for temporary work is lower than permanent walls because the piles can be reused and less corrosion protection is needed.

Sheet pile retaining wall cost for temporary work ranges from $300 to $800 per linear meter for material and installation, depending on depth and site conditions. Material cost for used piles is $300-500 per ton, while new piles are $550-800 per ton. The total project cost includes installation, bracing, and extraction. Reusing piles on multiple projects reduces the cost per use.

Cost Breakdown for Temporary Walls

Let me break down the costs for temporary sheet pile retaining walls.

Material Costs

Section	New Cost ($/ton)	Used Cost ($/ton)
U 400 x 100-10.5	550-650	300-400
U 400 x 125-13	600-700	350-450
U 400 x 170-15.5	650-750	400-500
U 600 x 180-13.4	600-700	350-450
AZ 18	650-750	400-500
AZ 26	700-800	450-550

Installation Costs

Depth	Installation Cost ($/linear m)
4 m	200-300
6 m	300-400
8 m	400-500
10 m	500-600
12 m	600-800

Bracing Costs

• Internal struts: $200-400 per linear meter of wall
• Tiebacks: $150-300 per linear meter
• Rakers: $100-200 per linear meter

Total Project Cost Example

• Excavation depth: 8 m
• Wall length: 50 m
• Section: U 400 x 170-15.5
• Material: 50 m × 0.4 m width × 8 m depth? Actually, total length calculation:

Wall length = 50 m
Piles per meter = 2.5 (for 400 mm width)
Total pile length = 50 m × 2.5 × 8 m = 1,000 m
Material cost: 1,000 m × 76 kg/m = 76,000 kg = 76 tons
Material cost: 76 × $650 = $49,400
Installation: 50 m × $400 = $20,000
Bracing: 50 m × $300 = $15,000
Total: $84,400 ($1,688 per linear meter of wall)

Cost Savings with Reuse

• New piles: $49,400
• Used piles: $30,400 (saving $19,000)
• Reusing on second project: Material cost only extraction and handling

My Experience
For a residential project, we used used sheet piles from a previous job. The material cost was 40% less than new piles. The client saved $15,000 on a 30 m wall.

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Sheet pile wall

A sheet pile wall¹ is a retaining structure made from interlocking steel sections that are driven into the ground to hold back soil and water.

A sheet pile wall¹ is a continuous barrier formed by driving interlocking steel sheet piles into the ground. The piles are connected by interlocks that create a watertight seal. The wall can be temporary (extracted after use) or permanent (left in place). Sheet pile walls are used for excavations, waterfront structures, and flood control.

Types of Sheet Pile Walls

Let me summarize the different types of sheet pile wall¹s.

By Function

Type	Description	Best For
Temporary	Extracted after construction	Excavations, basements
Permanent	Left in place	Quay walls, flood walls

By Support

Type	Description	Depth Range
Cantilever	No bracing, relies on embedment	Up to 6 m
Anchored	Tiebacks or ground anchors	6-20 m
Braced	Internal struts or rakers	Any depth

By Profile

Type	Description	Best For
U-type	Symmetric, Larssen interlock	Curved walls, moderate depths
Z-type	Asymmetric, higher efficiency	Deep, straight walls
Straight web	Flat web	Cellular cofferdams

My Experience
For a temporary excavation², we used a braced U-type sheet pile wall¹. The wall was 8 m deep with two levels of internal struts. After the basement was built, we extracted the piles and reused them.

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Residential sheet pile retaining wall

Residential sheet pile retaining walls¹ are used for basement excavations, driveway retaining walls, and slope stabilization on residential properties.

A residential sheet pile retaining wall is a smaller-scale version of industrial sheet pile walls. It is used for home foundations, basement excavations, and retaining walls on sloped lots. Light sections like U 400 x 100 or U 400 x 125 are common. For temporary work, used piles are often used to reduce cost. Installation can be done with smaller equipment.

Residential Applications

Let me explain how sheet piles are used in residential construction.

Common Applications

• Basement excavation support²
• Driveway retaining walls (up to 2 m height)
• Slope stabilization³
• Foundation support
• Garden retaining walls

Typical Sections for Residential Work

Height	Recommended Section
1-2 m	U 400 x 100-10.5
2-3 m	U 400 x 125-13
3-4 m	U 400 x 170-15.5
4-5 m	U 600 x 180-13.4

Cost for Residential Walls

Wall Height	Cost per Linear Meter (installed)
1 m	$150-250
2 m	$250-400
3 m	$400-600
4 m	$600-800

Advantages for Residential

• Fast installation⁴ (days instead of weeks for concrete)
• No curing time
• Minimal site disturbance
• Can be installed on sloped lots
• Used piles available at lower cost

Installation for Residential

• Smaller equipment (mini-excavator with vibratory attachment)
• Can be done in tight spaces
• Less noise than industrial pile driving
• Can be extracted after construction

My Experience
For a residential project in Australia, we supplied U 400 x 125 piles for a 3 m retaining wall. The homeowner needed to level a sloped lot for a new house. The piles were installed in two days, and the wall has held the slope for years.

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Conclusion

Temporary retaining structures¹ using sheet piles are fast, cost-effective, and reusable. Cantilever walls² work for depths up to 6 m. Braced or anchored walls are used for deeper excavations. Used piles reduce cost for temporary work. Residential applications use lighter sections and smaller equipment.

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