ArcelorMittalProducts & ServicesProduction RangeCombined wallsCombined walls with steel tubes
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Combined walls with steel tubes

Combined walls with steel tubes are an alternative to the HZ-M/AZ system. Tubular piles are the main retaining elements of the combined wall (king piles), carrying horizontal loads from soil and water pressures and vertical loads from the superstructure or anchoring system. The intermediary AZ sheet piles (infill sheets) transfer the horizontal loads from the retained soil and water to the tubular piles. Note that infill sheet piles are usually shorter than the king piles.

In some countries, U-type or cold formed steel sheet piles are used as infill sheets. ArcelorMittal does not recommend to use double or triple U-piles as infill sheets because of their reduced rotation capacity (interlocks are located on the neutral axis). Cold formed sheet piles have a looser and weaker interlock shape, so that ArcelorMittal does not recommend them as infill sheets.

One advantage of steel tubes is that they can be built-up from the same outside diameter tubes, but with different thicknesses over the length in order to adapt the resistance of the piles to the variable moments along the height. This solution is however only economically viable for rather long steel tubes because of the cost of butt-welding.

The main disadvantage of large diameter tubes is shipping (high cubage factor) and the weight of a single element to be driven (may require quite powerful driving equipment).

Buckling and torsion of relatively slender tubes may be a concern for high strength steels. A European project has studied these complex phenomenon for foundation piles and the results have been published a few years ago.

Tubular piles from ArcelorMittal are available in numerous European and US steel grades (large number of own facilities producing coils). The piles are provided with C9 connectors, which guarantees the minimum interlock hook connection (see EAU 2012), and can be coated on request.

ArcelorMittal Commercial RPS supplies spirally welded tubular piles manufactured in ArcelorMittal Projects’ mill in Dintelmond (NL). Tubes are delivered with EN 10204 - 2004 certification. The Dutch mill is equipped with a deep-water quay and can export tubular foundation piles with diameters up to 3000 mm, wall thicknesses up to 25 mm, and lengths up to 49 m without butt-welding.

The table below gives an overview of some of the possible combined wall systems. Please refer to our brochure “Spirally welded steel pipes” for further details.
Last modified: December 10, 2018
Metric units Imperial units

Combiwall - tubes

Section
Dia. 864 x 10.0
Dia. 864 x 12.0
Dia. 864 x 14.0
Dia. 914 x 10.0
Dia. 914 x 12.0
Dia. 914 x 14.0
Dia. 1016 x 12.0
Dia. 1016 x 14.0
Dia. 1016 x 16.0
Dia. 1219 x 14.0
Dia. 1219 x 16.0
Dia. 1219 x 18.0
Dia. 1422 x 16.0
Dia. 1422 x 18.0
Dia. 1422 x 20.0
Dia. 1524 x 16.0
Dia. 1524 x 18.0
Dia. 1524 x 20.6
Dia. 1626 x 18.0
Dia. 1626 x 20.0
Dia. 1626 x 22.2
Dia. 1829 x 18.0
Dia. 1829 x 20.0
Dia. 1829 x 22.0
Dia. 2032 x 20.0
Dia. 2032 x 22.0
Dia. 2032 x 24.0
Dia. 2540 x 21.0
Dia. 2540 x 23.0
Dia. 2540 x 25.0
Dia. 2997 x 21.0
Dia. 2997 x 23.0
Dia. 2997 x 25.0
Section Dimension tube Intermediate Sheet Piles = AZ 25-800 - D
D t G60 G80 G100 Isys Wsys
mm mm kg/m2 kg/m2 kg/m2 cm4/m cm3/m
Dia. 864 x 10.086410.0132148165134 5803 115
Dia. 864 x 12.086412.0149165181153 1603 545
Dia. 864 x 14.086414.0165181198171 4703 970
Dia. 914 x 10.091410.0134150166149 6503 275
Dia. 914 x 12.091412.0152167183171 3103 750
Dia. 914 x 14.091414.0169184200192 6804 215
Dia. 1016 x 12.01 01612.0157172188213 7704 210
Dia. 1016 x 14.01 01614.0175191206242 2504 770
Dia. 1016 x 16.01 01616.0193209224270 3805 320
Dia. 1219 x 14.01 21914.0187202216367 1906 025
Dia. 1219 x 16.01 21916.0208222236413 0406 775
Dia. 1219 x 18.01 21918.0228242256458 4407 520
Dia. 1422 x 16.01 42216.0220233247597 5508 405
Dia. 1422 x 18.01 42218.0242255269665 6909 365
Dia. 1422 x 20.01 42220.0264278291733 25010 315
Dia. 1524 x 16.01 52416.0226238251706 6609 275
Dia. 1524 x 18.01 52418.0249261274788 25010 345
Dia. 1524 x 20.61 52420.6279291304893 35011 725
Dia. 1626 x 18.01 62618.0255267280923 42011 360
Dia. 1626 x 20.01 62620.02792913031 019 14012 535
Dia. 1626 x 22.21 62622.23053173301 123 59013 820
Dia. 1829 x 18.01 82918.02662772891 230 70013 460
Dia. 1829 x 20.01 82920.02913033151 360 02014 870
Dia. 1829 x 22.01 82922.03163283401 488 48016 275
Dia. 2032 x 20.02 03220.03023133241 758 57017 310
Dia. 2032 x 22.02 03222.03293403511 926 22018 960
Dia. 2032 x 24.02 03224.03553663772 092 85020 600
Dia. 2540 x 21.02 54021.03403503593 161 30024 890
Dia. 2540 x 23.02 54023.03693793893 452 08027 180
Dia. 2540 x 25.02 54025.03984084183 741 47029 460
Dia. 2997 x 21.02 99721.03573663754 688 01031 285
Dia. 2997 x 23.02 99723.03893974065 122 29034 185
Dia. 2997 x 25.02 99725.04204294385 554 82037 070


D Diameter of tube
t Thickness of tube
G60 Mass of the combiwall with LAZ = 60% Ltube
G80 Mass of the combiwall with LAZ = 80% Ltube
G100 Mass of the combiwall with LAZ = 100% Ltube
Isys Moment of inertia of the system
Wsys Equivalent elastic section modulus of the system
Downloads
Spirally welded steel pipes 2010
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