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Despite
occasional routine maintenance work to the jetty over the years, what remains
consists predominantly of the original construction.
The jetty has, however, over the last few years fallen into disrepair with both
the understructure and the deck missing parts of the wooden structure. This may
be attributed to natural process and the age of the structure itself.
At first, based on appearance, the jetty would appear severely rotten, yet fairly
sound. After a close inspection, consisting of bores into the wood, individual
analysis of the structural members, visual inspection of the sub-marine structure
and probes into the foundation, the jetty is now considered to be too dangerous
to use and has been closed off by the local authority.
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FOOT
AND LOWER TRANSIT BEAMS: |
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The
foot beams are doubled up on either side of the lattice, below the bracing, with
the transit beams between each lattice. These beams are situated approximately
level with spring low, thus 90% of the time below waterline and exposed to wave
action and marine growth. A number of these members have exceeded their marine
life expectancy due to rot, others have been partially or totally dislodged from
the structure and are loose or lying below the water. |
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HEADER
BEAMS: |
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Situated above
the bracing, across the columns, would be exposed to water, only really at spring
high and where large swell is encountered. Main cause of deterioration is due
to corrosion and swelling of bolts. All are in tact and holding to perhaps 40%
of their original strength. |
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BRACING: |
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Situated diagonally
across the columns, they are vital to the stability and strength of the structure.
Loss of these members would condemn the integrity of the structure. Deterioration
is mainly located around the low water mark, where marine rot has eliminated all
structural stability in various members, dislodging them from their fixings. |
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MAIN
COLUMNS: |
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Depending
on their placement, these are at various stages of deterioration, from fairly
sound to non-existent. They are vital to the integrity of the structure. Recently,
a few of these members have been reinforced with a similar, smaller member. From
the roadside to the spring low level, they rest on the bedrock, and have a 500mm
x 500mm concrete supporting foundation to 300mm below the sand level. From spring
low level outward, the columns appear to be piled through the shallow sandy layer
and resting loosely on rock. |
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BEARER
BEAMS: |
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The main facet
of deterioration in the bearer beams is the large quantity of holding down bolts
in the beams, corroding and swelling, causing splitting. The bolts are relatively
small, thus reducing their ability to cause damage. |
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BEARER
PLANKS: |
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Deterioration of planks
due to exposure to the elements as well as vandalism, has resulted in many gaps
in the walkway, with rusted bolts sticking proud. |
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| Repairs over the years
appear to have been in an ad hoc manner, with various timber types and sizes,
causing a scruffy appearance and an uneven walking surface with loose members
causing a tripping hazard. |
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SKIRTING
AND HANDRAIL: |
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The handrail appears to
be a more recent addition, yet it is shabby and in need of repair. It is fixed
to a fairly weak and rotting skirting and will not resist any significant turning
moment and subsequently more of a hazard than a safety measure. |
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BOLTS: |
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All the bolts are extensively
rusted. Corrosion is causing swelling and thus splitting of the timber. Neglecting
the bolts will cause the timbers to fail. |
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