FLOATING MARINAS,
LITTLE HARBOURS
AND TEMPORARY SHELTERED
BERTHINGS
Inventor-Designer: Carlo Macrì
Illustration of various projects
Contents
TOURIST FLOATING HARBOURS
INVENTOR-DESIGNER: CARLO MACRI’
VARIOUS PROJECTS' ILLUSTRATION
Lately, also in consequence of a growing
success and development in the italian shipbuilding industry of amusement navigation, it pointed
out the
need of more boat’s places in our country
and an acceleration in the construction
of new tourist harbours and a retraining of the existing
but partly
deteriorated.
The recent legislative measures pro Italian
harbours updating, regarding consistent but not
sufficient investments, the speeding up
of bureaucracy
in giving construction’s authorization and
a more convenient and modern leasing contract
for new craft, in a near future shall drive to a growing
demand of further
berths for permanent and temporary nautical tourism.
In consideration of the huge lack of boat’s
places in Italy: for 400,000 boats and 450,000 small boats we have only
116,000 places available, without
consider and all the crafts landing abroad
in the bordering country. The prospective
of this fast occupation makes realistic the construction
of new
wet docks and all the economic
activities that can follow .
Recent articles, about Genoa Boat Show,
touched upon the possibility, also for tourist harbours,
to accede to different kind of public
funds: community,
national and regional from Local Authorities by the “project financing”, that
is a partnership with groups of private investors.
In this context, the society SVILUPPO ITALIA
SPA through a controlled firm, “Italia Navigando
spa”, is engaged in realizing and retraining
of 50 tourist
harbours in our country in order to place
a network of 25.000 boat’s spaces for
the seamen. Looking at this situation, it seem to me
reasonable put
to the attention of possible interested parties: Public
Autorities, private investors or holding companies some new models of “little
tourist floating
artificial harbours”
planned by myself , which main characteristic is “minimum environmental
impact”.
Considering that this kind of tourist harbour
can be realized, in optimal conditions, only on coasts where soundings
have at least 4-5 metres deep to
the limit of the concrete pier that links
it to the shore, its principal peculiarity are:
1) – minimal occupation of the space on the coast: from 50 metres to a maximum of 200 metres depending on bigness and type of chosen system;
2) – short use of cement works and therefore
minimum impact on soundings in vicinity of the shore: in some cases it
could be used a pile-structure
system as support base;
3) – it doesn’t come out any trouble to the regular undercurrent trend;
4) – same or reduced costs, on the basis
of different models, compared to the same concrete construction with
their bulky sea front’s reefs. Theese
costs can be retrieved thanks to the
sale of “real estates” or useful areas inside the harbours;
5) – possibilities of future enlargements or changes without big difficulties thanks to the modular structure of the main components;
6) – easy substitution and repair of external
barriers in case of heavy accidental deteriorations that can happen during
the years and force to an
extraordinary upkeep in the dockyard. This is
dues to a kind of assembly which allows to separate , without damages of
great importance, the
soaked hulls portion from the emerging and replacing
it temporarily with a cage system that can contain a appropriate number
of floats;
7) – transfer possibilities of the whole port structure in an other place when unforeseeable needs should require;
8) - reduced maintenance of hulls thanks
to structures build with metal alloy suitable for the sea environment both
with worked rolled through newer
and effective treatment “antifouling”
and with proceeding to the covering of plates with epoxy resins that guarantee
their duration for 45-50 years
without particular needs of refitting interventions.
On the other side, with higher costs, titanium can be used for parties
more difficult to replace,
but this means they will be much more resistant
to the corrosion for at least 100 years;
9) – strength and elasticity of the structures
that are well sheltered from sea’s strength, even when
is rough, giving big security to boats
and peoples lodged in the port area;
10) – short time in building works on the
sea-side thanks to standardized prefab that can be set,
in conformity to the case, on a series
of cement pillars with functions of pileworks;
11) – rapidity in assembling of varied
harbour structures that are composed by a series of metal hulls with particular
shapes connectable in an
elastic way one to each other, and can be constructed in shipyard before or simultaneously
at the linking works to the mainland;
12) – three kind of anchorage systems are utilizable. Their chose depends essentially both on the soundings and on strength of sea streams:
a) - “to dead body”, means that the anchorage
is composed of a big chain, which end leans on
the sae bed, that is linked to one or
more blocks
of concrete or metal pieces of different
shape and considerable weight that operate as anchor;
b) – in case of sandy sea floor with
stream of great strength it can be convenient to use the “suction pile
technology”, that is a system which, through
a water suction driven inside
a particular cylinder, vertically laid on sea bottom, brings to a forced
planting and a big stability; on the top of it they
are put one or
more steel components to hooking chains coming from sea surface;
c) – in case of a rocky seabed it can be
used the “drilled pile anchoring system” that consist in a offshore drilling
and a following insertion of a metal
cylinder, provided with big
rings on the top, from which numerous series of retractile sharp
“teeth” get driven out and will stick into the rock locking it;
d) – a fourth and new, because of recent
conception, anchorage support system utilized additionally and as reinforcement
to the preceding
“traditional”, is that of using one or more series of
"hydrodynamic resistance plates" that allow a “mid-water anchorage”.
They circumscribe without
closing a part of the water mass under the hulls,
making more difficult and slow the moving, in vertical and horizontal way,
of floating constructions
from which keels they depart, and that
could be induced them in presence of a strong wave motion on surface;
If we consider that the hulls are equipped,
under the keel, of system that give elasticity to the anchor’s chains
in the hooking point, there we can see
the big stability and the lack of
strong and troublesome vibrations that make more attractive and interesting
this kind of floating little harbour.
USEFUL INFORMATIONS AND EXPLANATION
As illustrated above and showed in designs
and relative descriptions of projects that can be seen throw links listed
below, every little harbour have
his own characteristic that really differentiate
it
from the others models and can make it
more or less right to a coast or an environment.
The proposed examples are only some of
numerous possibilities realizable with floating barrierhulls and everyone can have their various
peculiarity
and total dimensions that involve naturally different costs.
Former experiences in this sector have
showed the best and faster way to realize this kind of
works that involved a partial public investment
linked
to a “project financing” supported by private entrepreneurs and
investors. This allows to find, in short times, when the project is interesting,
the
necessary resources to a fast building of tourist harbours. Most investments
will be get back in
brief time, and the rest in the
medium-long additionally
to a fair margin of profit.
Just an example to clear up in what way
this can happen: if we have a total cost of 100, the public financing could
be 30 and this means that private
should give 70.
When work will be completed, since it
has been stipulated an agreement that privates manage the harbour for 25-30
years, since
in 4-5 years it succeed in selling to boat’s owner and all
the peoples interesting in like trader, artisans, restaurants etc at least
70-80% of available
“real estates”: boat’s places, garages, flats, offices
and every usable space for activities described above, then every investments
can be retrieved
and reinvested. For the part get back in longer time,
advantages are obtained from profit of managing the structure and from
the exclusive concession
in real estate trading.
Fixed that at the end of the agreement,
the ownership of harbours, excluding sold, goes to the promoting Local
Authority, the managing of the harbour
can be kept, with a new contract,
by preceding societies.
The remaining unsold real estates could
be bought from the Local Authority but at the starting
selling price
plus legal interests till to agreement maturity.
This kind of initiative could reveal itself
useful, in particular in southern Regions rich in beautiful environment
often unknown , to give an huge impulse
to a tourist development that can
bring welfare to the local populations giving them, through these constructions
and following economic activities,
new steady and qualified work’s occasions
that can stop the incessant emigration to the northern Italy or foreign
Countries.
SOME PROJECT’S SPECIFICATION
Going into details of various typology
represented in this website we can see at least 4 categories of tourist
harbours showed in particular under its
size aspect that can offer or less
a certain number of services:
1) - SMALL
: generally in pentagonal outline with two sides facing to open sea that
can have a
semicircular shape; inside we can realize 110-130 boat’s places according
to craft’s length;
2) - MEDIUM-SMALL:
same mould but bigger dimensions; 240-280 boat’s places;
3) - MEDIUM:
hexagonal shape; 350-400 boat’s places;
4) - LARGE
or “MARINA”: octagonal shape; 650-700 boat’s places, some of big length;
We can also realize a series of infrastructure
useful for a temporary landing, not a real harbour but anchorage points,
in specific coastal areas with
little gulfs or small bays, that could offer
transitory stays and good protection to crafts.
In any case, this kind of landings can
be easily built also on ordinary rectilinear coasts by segments of floating
breakwater that, opportunely ballasted
and positioned, can safely face
even the stronger sea-storm.
In every project above indicated we can
find or plan smaller harbours with characteristics that depend both
from different local environment and from
investor’s needs.
Total costs of works, could change when
get the “final project”, variation of 5-10% more or less considering different
elements or changes request
from buyers.
The number of boat’s places, calculated
on balanced “mix” of craft’s length, generally from 10 to 40 metres
with predominance of shorter or medium
size but not obligatorily, is likely
to depend on their composition established in the “executive project”.
CONVENIENT DEEPENING FOR LOCAL AUTHORITIES AND INVESTORS
As above-mentioned, Local Agencies’ Administrators
of coastal areas, especially in Southern Italy, where we have normally
the most delay on tourist
port’s development, should undertake in this
sector because they can get, as also indicated in Italia Navigando spa’s
programme, the following
advantages and engagements for weak local economies:
1) – Increase of tourist attraction skill and its rooting in the country;
2) – Promotion, guidelines and coordination of territorial development with the goal of realizing the so-called “Integrated Tourist Poles”;
3) – Increase in value of huge local resources
and treasures: architectural and landscape beauty, historical, cultural,
artistic, artisan and
oenogastronomic patrimony that wait only to be discovered;
4) – facilitation and increase of young entrepreneurial class in the industry of tourism, restoration and hotel;
5) – consolidation and qualification of the local small and medium firm system that could enlarge mostly in commercial, financial and artisan activities;
6) – On Agreement maturity (25-30 years)
with “project financing’s” Investors, the promoting Local Authorities find
themselves as owner of main port
infrastructures without pay out the huge
capital necessary for their building.
With regard to Private Investors, they
can obtain great advantages from this kind of investment that we can call,
in improper way “real estate”.
In fact, incomes deriving from sell: 80/90%
of boat’s places + 80/90% of shops, offices and labs realizable on inner
side of the harbour’s protection
barrier + all apartments and offices
available inside the directional tower, excluding the ground and the top
floor + 80/90% of inner garages and
exterior car’s places, cover the most
part of the expense, in different way, considering model and size of the
planned little harbour.
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Main pictures of various projects
Small and medium-small size tourist harbours