RD® pile walls

Wall structures based on steel piles are often the best solution to replace traditional, labor-intensive cast-in-place based retaining wall structures.

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    Based on RD® piles (RD220–RD1200) and installed by drilling, RD® pile walls are suitable for retaining wall structures in difficult ground conditions. The RD® pile wall works extremely well in retaining wall structures that are under not only horizontal loads but also vertical loads.

    Thanks to SSAB’s high-grade steel, our RD® pile walls have excellent bending stiffness and resistance.

    For more detailed information see SSAB’s RD® Pile wall design and installation manual.


    • Retaining wall structures
    • Building foundations
    • Wharves and piers
    • Road and railway structures
    • Bridges

    RD® pile wall structure

    The RD® pile wall is a combination of SSAB's RD large diameter piles and interlocking sections.

    RD® piles are connected by welded interlocking sections, creating a continuous pipe pile retaining wall against horizontal and vertical loads. The RD® pile wall is installed with an oversized ring bit instead of a normal ring bit. The RD® pile wall is always installed by percussion drilling methods, using a DTH hammer. The drilling method is centric.

    RD® pile pipes

    Pile pipes used in RD® pile walls are SSAB’s drilled RD220 – RD1200 piles. RD® drilled piles are special piles, installed by drilling in difficult ground and environmental conditions. The RD400 - RD1200 drilled piles are based on spiral welded steel pipe. The standard steel grade of RD400 – RD1200 piles is S355J2H, but grades S440J2H and S550J2H as well as X60 and X70 are also used. Pile pipes for the RD® wall are spliced by welding.


    In the RD® pile wall the pipe piles are attached to each other by interlocking sections. Adjacent piles are always interlocked using a pair of interlocking sections, a narrow and a wide one. The interlock type specially developed for the RD® pile wall is the SSAB RM/RF interlock.
    SSAB’s RM/RF interlock and the injection channel integrated in it ensure the water tightness of the bottom of the RD® pile wall and its rigid contact with rock without separate injection pipes.

    The SSAB RM/RF interlock can be used with pile sizes RD220 to RD1200.


    RD pile wall


    Standard pile sizes used in RD® pile walls. For project specific dimensions, please contact our sales.

    Standard piles and availability of steel grades of RD® pile wall

    Wall thickness [mm]
      10   12.5  14.2  16 18  20   22  23
    RD270 X X

    RD320 X X

    RD400 X X

    RD500 X X X *
    RD600 X X X X O

    X X X X X O    
    RD800 X X X X X O *  
    RD900 X X X X X O *  
    RD1000 X X X X X O * *
    RD1200 X X X X X O * *
    # = Steel grades S440J2H and S550J2H X = Steel grades S355J2H, S440J2H and S550J2H O = Steel grades S355J2H and S440J2H

    *) Please contact our sales for availability

    Steel grades

    Standard steel grades of SSAB’s retaining walls. Against special order, the piles may also be delivered in MH steel grades according to standard EN10219 or X grades according to API5L.


    Steel grade
    Carbon equivalent
    Chemical composition, max. Mechanical properties

    Impact strength

    CEV max. [%] [%] Mn [%]
    [%] [%] fymin [MPa] fu [MPa]

    Amin [%]


    KV min [J]

    S355J2H 0.45
    355 470-630 20 -20  27
    S440J2H 0.45
    440 490-630 17 -20  27
    550 605-760 14 -20  27

    Order & delivery

    To order RD® pile wall and Combi wall, please contact our sales.

    SSAB applies the General Conditions, ALBIF 2000, for deliveries with the addition that the parties will comply with applicable legislative and regulatory requirements and refrain from participating in any corrupt business practices.

    The technical terms of delivery for steel piles manufactured by SSAB are in accordance with the EN 10219-1 and ETA-12/0526. The dimensions and tolerances are as defined in EN 10219-2 and ETA-12/0526. Engineering work is in accordance with standard EN 1090-2.

    Steel piles are delivered with bundle tags and SSAB's pile markings to enable full traceability and identification.

    Type 3.1 material certificate will be provided according to the standard EN 10204.

    Design tools

    Software for fast and easy design

    RRPileCalc is a design program for SSAB's steel piles. Eurocodes as well as National codes and instructions are applied in the end-bearing pile design.

    PileWallCalc design tool enables easy calculation of cross section properties and bending resistances of the pile walls. The program calculates the bending resistances and normal force resistances of RD® pile wall, Combi wall and Zig-Zag Combi wall.

    Environmental responsibility and sustainability

    SSAB develops new products and services in order to improve our customers’ performance in sustainability and overall efficiency.

    Life cycle assessment data for SSAB’s products are available in the form of Environmental product declarations (EPDs). Manufacturing chain from raw material to finished product is carefully managed.

    SSAB has introduced CE marking for infrastructure products. Declarations of Performance (DoP) indicate the technical characteristics of CE-marked products.


    RD® pile wall - Proven retaining wall solution for difficult ground conditions in urban environments

    Fast and reliable installation and excellent water tightness has resulted in successful customer projects.

    RD® pile wall is specially designed for challenging conditions, for instance, for faster implementation of retaining walls and other foundation structures.

    You can always find the correct pile size and steel grade from SSAB’s extensive RD® pile and steel grade range, which allows you to implement a retaining wall or foundation structure with the best overall economy for all soil conditions and loading situations.

    Retaining wall pile

    Customer cases