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Retaining walls

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A retaining wall is a prefabricated reinforced concrete structure used to protect slopes, embankments and ground level differences. They are produced from concrete class C35/45 by industrial prefabrication, ensuring high resistance to soil pressure and durability in difficult ground conditions. They are used in road, railroad and industrial construction, and as protective elements in residential construction.

For each retaining wall project, the price is calculated individually based on the height of the structure, the length of the wall and ground conditions. We guarantee comprehensive technical advice, detailed design and timely delivery of prefabricated elements to the construction site. We invite you to get a free quote tailored to the parameters of your project.

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Prefabricated retaining wall – slope protection structures

A retaining wall is a key infrastructure element used to hold earth masses in case of differences in ground levels. Prefabricated retaining structures are characterized by high strength, precision of execution and speed of installation compared to walls made by traditional methods. The prefabrication system ensures repeatability of parameters and quality unattainable with on-site concreting.

The production of retaining walls is based on the use of concrete class C35/45 with a minimum compressive strength of 45 MPa. Reinforcement with A-IIIN class steel in an amount adapted to the static calculations ensures the transfer of tensile forces from soil pressure. The elements are characterized by exposure class XC4/XF4, which guarantees resistance to corrosion and cyclic freezing.

Types of prefabricated retaining wall structures

L-type retaining walls are the most popular solution for heights of 1 to 6 meters. The angular structure consists of a vertical shaft and a horizontal base that uses the weight of the soil for stabilization. The modular system allows elements to be combined to form continuous retaining walls of any length.

Prefabricated precast retaining walls are also available in a T-type variant for greater heights and as solid walls for extreme loads. Special corner elements allow the wall to be broken at different angles. The system also includes slope elements with a slope adapted to the angle of the natural soil chute.

Technical parameters of prefabricated retaining walls

The prefabricated retaining wall is designed for ground pressure in accordance with Eurocode 7, taking into account active pressure, passive pressure and ground loads. The thickness of the stem is from 20 to 60 cm, depending on the height of the structure. The width of the base is 50-70% of the height of the wall, providing stability for rotation and displacement.

The system of prefabricated retaining walls is characterized by modular construction with elements 2-3 m long and weighing 3-15 tons. The facing surface can be smooth, textured or with the possibility of installing cladding. All elements are equipped with transport brackets and connection systems to ensure structural continuity.

Application in various ground conditions

L retaining walls perform well in non-cohesive and cohesive soils with varying degrees of consolidation. A drainage system integrated into the structure drains ground water, eliminating additional hydrostatic pressure. The possibility of anchoring in the native soil increases the load-bearing capacity with a limited base width.

In conditions of chemical aggression, concrete retaining walls made of concrete with increased resistance to sulfates and chlorides are used. Additional protection in the form of epoxy coatings or bituminous insulation extends the life of the structure. The system also allows the construction of sheet pile walls with seals between elements.

Advantages of prefabricated retaining wall

Speed of installation of retaining walls

A prefabricated retaining wall is assembled 10 times faster than a wall made traditionally. Elements delivered ready for construction are laid by crane at a rate of 20-30 mb per day. The lack of need for formwork and waiting for concrete to mature reduces the time of the project by 70%.

High quality prefabricated retaining walls

The production of prefabricated retaining walls under factory conditions guarantees parameters unattainable on site. Concrete matured under controlled conditions reaches a strength of 45-55 MPa. Precise placement of reinforcement with 40-50 mm lagging ensures durability exceeding 100 years.

Cost-effectiveness of L-type retaining wall

L-type retaining walls reduce material consumption by 40% relative to solid walls. Using the weight of the soil on the base minimizes the volume of concrete. The precast system eliminates the cost of formwork, scaffolding and long-term staffing.

Versatility of prefabricated retaining walls

The system of prefabricated retaining walls allows the realization of walls from 1 to 8 meters high. Modular design allows any line of the wall – straight, arched, stepped. The possibility of combining with other protection systems increases design flexibility.

Reliability of retaining walls L

L retaining walls designed in accordance with Eurocode maintain stability with a safety factor of 1.5. Prefabrication eliminates execution errors that can weaken the structure. The system tested in thousands of implementations guarantees predictable structural behavior.

Resistance of concrete retaining walls

Concrete retaining walls made of C35/45 concrete have a frost resistance of F200 and water resistance of W12. Exposure class XF4 provides resistance to de-icing salts used on roads. The surface of architectural concrete does not require additional finishing.

Minimal interference with the environment

Installation of a prefabricated retaining wall reduces earthwork time and noise emissions. Prefabrication reduces construction waste to practically zero. The possibility of dismantling and reusing the elements increases the environmental friendliness of the solution.

Ease of installation integration with the retaining wall

Prefabricated retaining walls allow cable and pipe penetrations to be built in as early as the manufacturing stage. The drainage system can be integrated into the masonry structure. Possibility of installing balustrades, noise barriers and lighting without weakening the structure.

The use of retaining wall in construction

The retaining wall is widely used in various branches of construction as an element to secure and stabilize the ground. Prefabricated retaining structures are used both in large infrastructure projects and in smaller private investments. The versatility of the system allows it to be adapted to the specific requirements of each project.

Road and highway construction

In road infrastructure, retaining walls protect embankments and excavations along transportation routes. The prefabricated system allows quick construction of retaining walls when widening existing roads. Structures up to 8 m high are used at highway interchanges and in road crossings.

Prefabricated L-type retaining walls are used as supports for overpasses and bridge abutments. Resistance to vibration from vehicle traffic and de-icing salts predestines the system for road applications. The ability to integrate noise barriers increases the functionality of the structure along expressways.

Railroad infrastructure

Prefabricated retaining walls protect tracks in trenches and on railroad embankments. The system transfers dynamic loads from passing trains without settling. The prefabricated units are used in the construction of railroad platforms as platform walls and support structures.

In railroad upgrades, the prefabricated retaining wall allows work to be carried out without halting traffic. Elements are assembled in technological breaks, minimizing the impact on operations. The system is used in electrification as supports for traction poles.

Industrial and warehouse construction

Manufacturing plants use prefabricated retaining walls to form storage and maneuvering yards. The system makes it possible to create boxes for bulk materials on three sides. Retaining structures are used as walls for ground silos and retention tanks.

In logistics centers, L retaining walls form unloading ramps adapted to different heights. Prefabricated elements protect slopes at halls founded at different levels. Forklift impact resistance predestines the system for warehouse applications.

Housing and estate construction

In residential areas, concrete retaining walls make it possible to develop plots of land with steep slopes. The system allows the creation of terraces and parking levels on slopes. Precast units are used as retaining walls of underground garages that protrude above ground level.

In single-family construction, the retaining wall protects slopes at properties located on slopes. The possibility of finishing the face surface with different textures matches the structure to the architecture. The system allows integration of landscaping elements – flower pots, benches, lighting.

Flood protection

Prefabricated retaining walls are part of dikes and river embankments. The tightness of the connections between the elements prevents water infiltration. The system makes it possible to quickly build temporary defenses in emergency situations.

Environmental remediation and protection

In degraded areas, prefabricated retaining walls stabilize landslides and protect slopes. The system is used in the reclamation of pits and industrial dumps. The possibility of greening the surface integrates the structure with the natural surroundings.

In wastewater treatment plants, prefabricated retaining walls form process chambers and settling tanks. Resistance to chemical aggression allows contact with wastewater. The system is used at landfills as a safety element.

Technical parameters of the retaining wall

The retaining wall is designed and manufactured in accordance with PN-EN 15258:2009 for precast concrete products – retaining wall elements. Static calculations performed in accordance with PN-EN 1997-1 (Eurocode 7) and PN-EN 1992-1-1 (Eurocode 2). All elements have a CE declaration of performance and a certificate of conformity.

Strength parameters of retaining walls

Prefabricated retaining walls are made of concrete of minimum class C35/45 with characteristic compressive strength fck = 35 MPa for cylindrical specimens. Tensile strength fctm = 3.2 MPa. The elastic modulus of concrete Ecm = 34 GPa ensures limited deformation under load.

L-type retaining walls are reinforced with A-IIIN RB500W grade steel with yield strength fyk = 500 MPa. The degree of main reinforcement is 0.8-1.5% depending on the height and loads. Reinforcement cover: 40 mm on the ground side, 50 mm on the foundation side for exposure class XC4/XF4.

Dimensions of standard elements

Typical prefabricated retaining walls are produced in the following dimensions: total height 1.0-8.0 m (in 0.5 m increments), module length 2.0-3.0 m, stem thickness 200-600 mm increasing linearly with height. The width of the base is 0.5-0.7 of the total height, the thickness of the base is 250-500 mm.

The L-type prefabricated retaining wall has the following geometric parameters: face wall slope 5-10°, front base overhang 0.1-0.15H, rear base overhang 0.4-0.6H. The weight of the elements varies from 3 tons for a height of 1.5 m to 15 tons for 6 m.

Geotechnical parameters and loads

The system of prefabricated retaining walls is designed for the following loads: soil pressure Ka = 0.25-0.35 (φ = 30-35°), ground load qk = 10-40 kN/m², hydrostatic pressure at ground water level. Base-soil friction coefficient μ = 0.4-0.6.

L retaining walls maintain stability with a factor of safety: for rotation ≥ 1.5, for displacement ≥ 1.3, ground bearing capacity ≥ 1.4. Permissible displacement of the crown of the wall L/300, base settlement 50 mm.

Physical and chemical properties

All concrete retaining wall elements are characterized by: frost resistance F200 (200 cycles), water resistance W12 (1.2 MPa), water absorption max 4% by weight. Environmental classification: XC4 (cyclic wetness), XF4 (frost with salts), XA2 (moderate chemical aggression).

Chloride diffusion coefficient D ≤ 8×10-¹² m²/s. Abrasion resistance – class 4 according to PN-EN 1338. Reaction to fire – class A1 (non-flammable product). Asbestos emission – no asbestos content.

Drainage system and water drainage

The retaining wall is equipped with a drainage system: drainage holes φ100 mm every 2-3 m horizontally and vertically, an aggregate filter layer behind the wall, the possibility of connecting a linear drain. The transverse slope of the base 2% in the direction from the slope.

Installation of the retaining wall – execution instructions

Proper installation of a prefabricated retaining wall requires careful preparation of the foundation and adherence to installation procedures. The process includes excavation, foundation preparation, setting of prefabricated elements and construction backfill. The use of appropriate crane equipment and adherence to health and safety rules guarantee the safe execution of the structure.

Ground preparation and foundation

The excavation for retaining walls is made with a reserve of 0.5-1.0 m from the face of the structure for freedom of installation. Slope of the slopes of the excavation adapted to the type of soil – 1:1 for cohesive soils, 1:1.5 for non-cohesive soils. The bottom of the excavation leveled to an accuracy of ±30 mm, compacted to Is ≥ 0.98.

Under L-type retaining walls, a 10-15 cm thick C12/15 lean concrete ballast or a layer of stabilized aggregate is made. In weak-bearing soils, soil replacement or foundation piles are used. The foundation level is a minimum of 0.5 m below the frost zone (1.0-1.2 m below ground level).

Transport and setting up the elements

Prefabricated prefabricated retaining walls are transported in near target position using low-loaders. Unloading with a crane with a lifting capacity of 1.5x the weight of the element with a safety factor. Elements weighing 3-15 tons require mobile cranes of 25-50 tons.

Installation of the prefabricated retaining wall begins with the corner elements that form the geometric base. Elements set on a layer of M10 leveling mortar 2-3 cm thick. Verticality controlled in two perpendicular directions with a tolerance of ±10 mm/3m in height.

Joining elements and expansion joints

Vertical joints between elements of prefabricated retaining walls filled with C30/37 shrinkage-free mortar. Centering inserts and bentonite gaskets are used at joints to ensure tightness. Connecting reinforcement φ12-16 welded or overlapped in assembly sockets.

Expansion joints in retaining walls L made every 15-20 m and at the bends of the route. Expansion gap 20-30 mm wide filled with elastic profile and permanent plastic compound. Expansion joints go through the entire height of the structure including the base.

Implementation of drainage and protection

Behind the concrete retaining walls, a drainage layer of 16-32 mm aggregate is laid with a minimum thickness of 30 cm. A 200 g/m² separation geotextile separates the drainage from the native soil. PVC drainage pipes φ100-150 mm laid with a slope of 0.5% to the collection wells.

Moisture insulation of the retaining wall made in two layers with bituminous compounds or bucket film. Surfaces in contact with the ground protected with a corrosion protection coating. In the splash zone near roads, hydrophobic impregnations are used.

Construction backfill

Backfilling of the prefabricated retaining wall performed in layers of 20-30 cm with compaction to Is ≥ 0.95. Backfill material – non-cohesive aggregate with a friction angle φ ≥ 30°. Compaction with light equipment at a distance of up to 1 m from the wall, further with rollers.

The first layers of backfill at L-type retaining walls laid symmetrically on both sides of the base. Difference in the level of backfill on both sides of the wall max 1 m. Control of displacement of the structure during backfilling – allowed 20 mm.

Quality control and acceptance

After the installation of prefabricated retaining walls, the following measurements are taken: structure geometry (±20 mm), verticality (±1%), crown level (±20 mm). Testing of expansion joints by pouring method. Test loading for 5% of the elements according to the design.

Acceptance documentation for the retaining wall includes: partial acceptance reports, element certificates, soil test results, as-built survey measurements. Displacement monitoring conducted for the first year of operation.

Retaining wall price – comprehensive calculation of retaining structures

The retaining wall price is shaped by many technical and execution factors affecting the final cost of the investment. The pricing includes the cost of prefabricated elements, transportation, installation, foundation and earthworks. Retaining walls price depends on the height of the structure, length, ground conditions and the class of concrete used in production.

Cost components of retaining walls

The main element affecting the price of retaining walls is the cost of the prefabricated elements themselves, which accounts for 50-60% of the investment value. L-type retaining walls unit price per m² of face area increases non-linearly with height – a 4 m wall is 2.5 times more expensive than a 2 m wall. Prefabricated retaining walls price also includes specialized transportation, the cost of which depends on the weight of the elements and distance.

An important component is the prefabricated retaining wall installation price requiring a crane with a lifting capacity of 25-100 tons. Prefabricated retaining walls earthwork price is 15-20% of the cost with standard soil conditions. Additional expenses include drainage, foundations and possible ground reinforcement.

Price list 2024 for retaining walls

Precast concrete prices are seen stabilizing in 2024 after previous increases. Retaining wall price in 2024 per m² of face area is at a competitive level with monolithic structures. Retaining wall L price in 2024 summer season may be higher by 10-15% due to increased demand in road construction.

Current rates in 2024 show the variation in concrete retaining wall price by region of the country. Prefabricated retaining walls in large metropolitan areas cost more due to higher transportation and installation costs. Manufacturers offer discounts of 5-10% for orders of more than 500 m² of construction.

Price forecast for 2025

Projections for 2025 indicate a 4-6% price increase in the segment of retaining structures. Retaining walls price in 2025 will be shaped mainly by rising reinforcing steel and cement costs. Prefabricated retaining walls may gain a price advantage over monolithic ones due to rising labor costs.

In 2025, new L-type retaining wall solutions are expected to be introduced the price will depend on the degree of prefabrication. Elements with integrated drainage and architectural finishes will be 20-30% more expensive. Standard concrete retaining walls will remain the most economical choice.

Cost comparison of different systems

Economic analysis shows that prefabricated retaining walls total price is 30-40% lower than monolithic walls at heights above 3 m. L-type retaining walls are the cheapest prefabricated solution, T-type more expensive by 20-30%. Prefabricated retaining wall price is competitive with reinforced soil walls at heights up to 5 m.

The gabion system is cheaper initially by 40-50%, but retaining walls the price of prefabricated operation is much lower. Palisades and sheet piling compete on price only for temporary structures. Long-term prefabricated retaining walls offer the best value for money.

Cost optimization of retaining structures

Reducing the outlay for the retaining wall price is possible by optimizing the height and using grading. Dividing the high wall into terraces reduces the cost by 20-30%. L-type retaining walls price drops when using typical catalog elements instead of custom production.

Savings in the category of retaining walls prefabricated price is achieved by proper geotechnical diagnosis eliminating oversizing. The use of drainage reduces soil pressure and allows thinner sections. Grouping orders for several investors reduces transportation and installation costs.

Operating costs and durability

Concrete retaining wall system price of operation is limited to periodic maintenance every 5 years. Drainage cleaning and expansion joint filling are the only maintenance work. A design life of 100 years eliminates the need for major repairs.

Investment in high-quality prefabricated retaining walls price higher initially pays for itself through lack of failure and damage. Resistance to freezing cycles of F200 ensures durability in the Polish climate. The total life-cycle cost is the lowest of all retaining structure technologies.

The final retaining wall price of each project requires an individual calculation taking into account local conditions, geotechnical parameters and design requirements. We encourage you to contact us to prepare a detailed offer of retaining structures tailored to your investment.

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Precast concrete units are prefabricated building components produced off-site that can be assembled into larger structures at the project site. These are standard, repetitive modules produced in series at industrial plants, which greatly speed up and facilitate construction work in various construction sectors.

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