Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
reinforcing bars etc.). This zone should make it possible for the different work units to carry out their work
reducing distance for transportation and increasing machinery performance. The timeline presented here implies
dividing the building work into four parts:
• Maritime works (26 months): Breakwaters, rubble mound and berths.
The first task is the breakwater works (18 months): this begins by building the main rubble mound
breakwater that runs for the first 1,300 m and is then vertical for another 2,500 m. During this period,
the rubble mound breakwater to protect the landfill at the south-eastern part of the terminal will also be
carried out.
Both the main breakwater and the east breakwater will be carried out in advance using land-based
and maritime means. The vertical breakwater comprises reinforced concrete caissons that will be built
by maritime means (a floating shipyard for caissons) in a zone that has a sufficient draught or in a
prepared land area. Then, they will be floated to where they are to be put in place. Before they are
anchored, the area will be prepared by creating the rip-rap and the gravel bedding layers. Once they
have been submerged, the cells are filled with granular material and the crowning slab is put in place.
The breakwater work ends with the creation of the protective breakwater crown wall.
The dredging work begins by digging the trench for the bedding layer of the vertical breakwater. As
soon as the mound breakwater has been built and provides sufficient protection, work should begin on
the inner basin (multi-purpose and ancillary berths) up to level 15.00 and subsequently the outer basin
up to level 20.00. The material that is dredged up should be pumped into the zone where the future
terminal is to be situated, so that it can be used as landfill.
The dredging work can be affected by the monsoon season which falls between the months of May to
September. During this period, the south west swell implies higher waves, which in turn means a
reduction in the performance of the dredging equipment. It is estimated that the dredging works should
take around 17 months.
In much the same way, the piers (container, multi-purpose and ancillary berths) shall begin to be built
as the breakwater progresses. There is a 16-month deadline. This work shall be carried out using
maritime means (pontoons or jack-up barges), and land-based means once the rubble mound bunds
have been created. The piles will be put in place first, then the sloping rip-rap protection and finally
the reinforced concrete superstructure (beams and slabs).
• Land works (16 months): Yards, networks, utilities and buildings.
Work on the terminal will be carried out during this phase, beginning with the work to consolidate the
landfill and the creation of the walkway on which paving blocks will be laid. These tasks will take 12
months.
Thereafter, work will be carried out on the terminal access facilities (gates), on the internal railway (8
months) and also on the installations that serve the terminal and the docks (electricity, lighting and
water supply, fire fighting elements, bunkering, sewage and communications).
It is estimated that it will take 10 months to construct the buildings (port management buildings and
operation and maintenance buildings). They will be built in parallel to the aforementioned tasks.
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