Aluminium stoplogs


Stoplogs from the Singen site have a proven record over many years in hydraulic engineering, flood protection, sewage treatment and firewater containment – both the standard design and in many custom-built systems.

Aluminium stoplogs

Aluminium has a number of advantages rendering it particularly suitable for stoplogs.

Since stoplogs usually have to be kept available on-site for several years, low maintenance is particularly important. Aluminium is corrosion-resistant, does not need painting, unlike steel, and, unlike wood, is not destroyed by pests. It does not warp and retains its straightness very well. Aluminium extrusion technology allows for the best possible structural cross-section design.

The aluminium logs weigh very little, so can usually be carried and installed by one person. This speeds up assembly and reduces the risk of accidents.

The increasing need to be watertight, especially in flood protection, has led to a new generation of stoplogs with sealing options. Cross-sections are compatible with previous profiles in terms of retro-fit replacements and adding extras.

Water tightness

Traditionally, stoplog barriers were primarily for closing off areas in an emergency, for temporary use, with only a limited amount needing to be watertight. The first generation of stoplogs from Constellium Singen represented a major step forward, as a seal establishes by itself really quickly thanks to the frame holding its shape so well.

The frames in second-generation logs have recesses in the horizontal joints, into which special seals can be pressed if required.

How to create the seal between the lowest log and the invert, as well as to the sides in the guide channels, needs to be looked at on an individual basis. Being absolutely water-tight takes considerable effort. However, this is often not absolutely necessary as self-sealing is an option in some cases, or in others, the groundwater behind the barrier has to be pumped out anyway.

Constellium Singen Aluminium stoplogs System

Stoplog material according to
EN AW-6060 T 66 EN 573-3
(EN AW-6063 T6 SQ) EN 573-3
Main alloying elements Al; Mg; Si
Application Temporary installation in hydraulic engineering, flood control, sewage technology and fire water retention measure.
General information Very well suited alloy for water and other liquid shut-off measures under normal temperature conditions. Very good experience over many years compared to other alloys or other metals.


PHYSICAL PROPERTIES Weight EN 1999 2,7 g/cm³
Modulus of elasticity EN 1999 70 000 N/mm²
Operating temperature range up to 80°C
Tensile strength DIN EN 755-2 215 N/mm²
Yield point DIN EN 755-2 160 N/mm²
Thermal expansion EN 1999 23 x 10-6/K
Poisson‘s ratio EN 1999 0,3
Hardness, Brinell EN 755-2 ( ~ 70 )
Weldability EN 1999 G-S
CHEMICAL PROPERTIES Atmospheric, Weathering, UV exposure VG
Ozone VG
Aging VG
Drinking water VG-G
Wastewater G
Seawater DIN 81 249-2 G-S
Dilute acids* VG-S
Concentrated acids* G-P
Diluted alkalis* G-P
Concentrated alkalis* S-B
Oils and grease VB
Petrol VG
VG very good
S satisfactory
B not good
G good
P sufficient
n not suitable
* = depending on temperature and type of substance

Mechanical properties & maximum log cross-sections

EN AW-6063 T6 SQ

according to DIN EN 755-2 and DIN 4113 (formerly AIMgSi0.5 F22)

Tensile strengthRm≥215 N/mm²
Yield pointRP 0,2≥ 170 N/mm²
ElongationA= 12%
Modulus of elasticity70 000 N/mm²

Allowable stresses (tension/compression, load case H)

zul σWEZ = 48 N/mm² (welded)

zul σ = 95 N/mm² (base material)

Type/profile numberA/38192B/38193C/38194
Weight per metre length8,51 kg/m7,26 kg/m11,17 kg/m
Weight per m²28,35 kg/m²48,42 kg/m²49,66 kg/m²
Moment of inertia ly137,7 cm⁴363,9 cm⁴1609,9 cm⁴
Section modulus WY55,1 cm³80,8 cm³214,6 cm³

Sealing strips

EPDM Shore 60A

Seal between logs

Profile number M 02075


Profile number M 02092

Maximum log cross-sections

using allowable stresses in the centre of the log, unwelded: zul σ = 95 N/mm², buckles at v ≤ 1,5, reference stress σv ≤; 0,75 x Rpo,2

at a max. deflection of 1/150 of the log span

Structural analysis of the shear strength, when held in the side channels within the limits shown in the diagram, is always possible, even with welded-on end caps. The extent to which the logs fit into the side channels (engagement depth) must be designed so that the logs cannot slip out accidentally. From a structural perspective, a support width of 2 cm is sufficient for analysis of the permissible pressure on the aluminium planks. However, the material or shape of the guide channel (concrete, wood) usually calls for greater support widths or engagement depths.

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