Technical Commentary

Technical Commentary

The staff of Consult Marine have made some interesting observations over the last two decades, mostly with regard to the correlation of theory & practice.
Some concise technical commentary & photos are presented below. They bring to light a few quirks from the unique & wonderful world of marine construction.

Underwater Concreting
The tremie method is a simple, yet effective way of placing concrete underwater.  A gravity-fed tremie consists of a rigid
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Underwater Inspection of Piles
Sometimes defects in either steel or timber piles are not evident above water (refer to photos – courtesy of Polaris
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Underwater Vacuuming
During underwater foundation preparation, it is sometimes necessary to provide a perfectly prepared and clean surface.  This may require bulk
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Underwater Power Tools
Underwater construction requires the use of specialised tools.  Hydraulic-powered tools are often used due to their relative longevity and safety. 
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Plastic Bar Chairs
Use of either steel or plastic bar chairs is generally avoided in reinforced concrete marine structures.  Plastic is generally difficult
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Pile Splice Connections
Splicing is a common method used to repair defective timber piles in the marine environment.  A pile splice involves replacement
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Stainless Steel Reinforcement
Stainless steel reinforcement is sometimes used in marine structures.  Often when a long service life is desired, or where the
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Raking of Sandstone Seawalls
Raking of sandstone seawalls may be readily achieved by stepping the courses.  Each successive course of blockwork is back-set some
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Marine Borers – Teredinids
Arguably, the most destructive marine borer is the Teredinid (also known as Ship worm).  Evidence of Ship worm is sometimes
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Marine Borers – Pholads
Pholads are marine borers from the mollusc family.  Martesia Striata (refer to photo) is a commonly found Pholad.  It is
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Marine Borers – Isopods
The destructive work of Isopods is one of the most easily recognisable of marine borers.  Examples of Isopods are Limnoria
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Inorganic Coating of Steel Piles
Cathodic protection (CP) may be used on immersed steel piles to protect them from corrosion below mean sea level.  A
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Accelerated Low Water Corrosion
Accelerated Low Water Corrosion (ALWC) can affect unprotected marine steelwork within the lower portion of the tidal zone.  It is
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Timber Piling into Rock
Driving timber piles into rock can be problematic.  There is usually no option but to displacement drive the pile into
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