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Accropode blocks are man-made unreinforced concrete objects designed to resist the action of waves on breakwaters and coastal structures.

History[edit]

Accropode (1981)

The Accropode is a single-layer artificial armour unit developed by Sogreah in 1981. Accropode concrete armour units are applied in a single layer.

Ecopode (1996)

The Ecopode armour unit with a rock-like appearance was developed by Sogreah to enhance the natural appearance of concrete armourings above low water level. A patent application was filed in 1996. The color and type of rock-like appearance can be specified to match the surrounding landscape.

Accropode II (2004)

In 1999, Sogreah modified the original Accropode shape by chipping away excess materials and adding friction features in the form of small pyramids. A patent application was filed for this modified shape. In 2004 further modifications to the 1999 shape were made, resulting in the Accropode II. The shape modifications are intended to increase interlocking.

Design[edit]

Hydraulic stability[edit]

Specified stability coefficients at design stage:

  • Hudson’s design KD values:
    • 15 on trunk sections (16 for Accropode II)
    • 11.5 on roundheads (12.3 for Accropode II)
  • Van der Meer stability number:

NS = HS/(∆ Dn50)= 2.7 (2.8 for Accropode II)

where:

HS = significant wave height

∆ = relative mass density

Dn50 = nominal diameter

These coefficients are valid for armour slopes from 3H/2V to 4H/3V and for seabed slopes up to 3%.

The uneven surface of the Ecopode improves interlocking by friction, thereby increasing hydraulic stability.

3D simulation of wave motion near an accropodes.[1]

Implementation[edit]

Large Accropode units are lowered into a position offshore by aid of a crane.

Fork-lifting is effective for handling the small to medium size units, whereas large units are handled by sling. Placement for breakwaters generally requires a crane or a barge-mounted crane.

The units can be stored one on top of the other, and placed in a random attitude to obtain the specified packing density. The proper packing method provides an adequate coverage on breakwater slopes.

The use of a remote-release hook is used for placing the unit, while underwater placements may be enhanced by GPS, adhering to a theoretical grid.

Diver inspecting blocks

See also[edit]

References[edit]

  1. ^ MEDUS. (2011) Marine Engineering Division of University of Salerno. Retrieved online 10 April 2011 from: http://www.diciv.unisa.it/docenti/dentale/medus_.php (MEDUS)

External links[edit]

Gallery[edit]

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Accropode — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

28 news items

Báo giao thông

Báo giao thông
Sun, 07 Feb 2016 18:22:57 -0800

Một sà làn chở đầy các khối phủ Chinese Accropode, một chiếc khác được cố định bằng dây chằng phía trên đặt cần cẩu 45 tấn. Trên sà lan có 5 người, trong đó có một tư vấn giám sát theo dõi các hoạt động, hai nhân viên buộc dây, một thợ lái cần cẩu và ...

Réunion 1ère

Réunion 1ère
Wed, 05 Aug 2015 05:24:03 -0700

En début d'après-midi, dans la zone artisanale du Port avant le rond-point Vilebrequins, un accropode de 20 tonnes est tombé du camion qui le transportait vers la route. Plus de peur que de mal ! Aucun blessé, ni aucun dégât n'a été constaté.

Réunion 1ère

Réunion 1ère
Fri, 20 Dec 2013 07:05:55 -0800

L'accropode marquant le début des travaux de la nouvelle route du littoral est posé. Par Gilbert Hoair; Publié le 20/12/2013 | 19:05, mis à jour le 21/12/2013 | 10:48. Les blocs accropodes remplaceront les tétrapodes qui protègent la route actuelle. Le ...

Construction Week Online

Construction Week Online
Mon, 07 Apr 2014 02:56:15 -0700

A 4km breakwater will be constructed to protect the harbors by using quarried rock material of 2.5mn tons and 26,000 special protective concrete units called Accropode II. A 2.5km quay wall will be constructed by using 12,000 concrete block units in ...

Outre-mer 1ère

Outre-mer 1ère
Thu, 24 Sep 2015 06:28:44 -0700

Nouvelle route du littoral : un prêt de 622 millions d'Euros avant la pose du premier accropode · Chantier de la Nouvelle Route du Littoral : où en est l'enquête sur les attributions de marchés ? We were unable to load Disqus. If you are a moderator ...
 
AGERPRES
Mon, 05 Oct 2015 00:07:33 -0700

Proiectul a început cu execuția structurilor costiere proiectate, structuri realizate cu materiale precum: piatră de diferite sorturi, prefabricate — accropode II, acestea fiind special executate în cadrul proiectelor. Toate structurile costiere cu ...

Báo giao thông (lời tuyên bố phát cho các báo) (sự đăng ký)

Báo giao thông (lời tuyên bố phát cho các báo) (sự đăng ký)
Tue, 10 Nov 2015 20:42:52 -0800

Phần việc của Tổng công ty 319 là đúc, vận chuyển và lắp các khối phủ Chinese Accropode phủ thân đê để phá sóng. Công việc tưởng chừng nhẹ nhàng nhưng không hề đơn giản. Chiếc sà lan 1000 tấn chở chiếc cần cẩu bóc từng cục Chinese Accopode ...
 
Hürriyet
Sun, 11 Oct 2015 15:43:03 -0700

Mendireklerin koruma tabakası 26 bin adet 7'şer tonluk "Accropode II" isimli beton ünitelerden oluşacak. 7 metre seviyesine kadar taranacak limanlara daha büyük deniz araçları yanaşabilecek. 2.5 kilometrelik rıhtımlar inşa edilecek. Proje 38 ayda bitecek.
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