Construction of Peripheral Road and Temporary Stabilization of Dyke at Trafigura Tank Farm
The client, Metron Ghana Limited Commissioned PMI to design and
supervise the construction of the peripheral road of the Trafigura Tank
Farm, and also come out with a temporal solution to rectify cracks caused by settlement and poor
construction methods of the dyke at
the Tank Farm.
The scope of works consisted of the
following:
- Detailed design of the road;
- Construction supervision of the
road;
- Design of temporal solution of the
cracks;
- Construction supervision of the
designed solution.
The Works
Peripheral Road
An initial survey was conducted. The
survey was then used for the detailed
engineering design.
Prior to layer works, setting out was
carried out as per the design. All
unsuitable and soft material was
excavated and removed from the road
prism.
Two lower selected layers of 150mm
thickness each was imported, placed
and compacted.
The imported 150mm of sub base
material was compacted to 95%MOD
AASHTO density. Kerb stones were
then laid, followed by the 150mm
crushed G4 Grade base course
material.
The base coarse material
was then mixed, placed and
compacted to the required
specification, 98% MOD AASHTO
Density.
Sand replacement tests were
carried out on to ensure compaction
requirements.
Survey control was also
employed during all the construction
stages to ensure all required slopes
and cross falls were attained.
Temporal Dyke Stabilization
The Dyke was stabilized by carried out
the following works:
- A reinforced concrete footing was
cast all round to hold the slope face
slabs in place.
- Where cracks were too severe, the
entire slope face slab was
demolished and reconstructed using
wire mesh as reinforcement.
- All joints were filled with quarry dust
mixed with bitumen.
- The dyke was then painted with
cement paint to give it a uniform
finish.
The entire valve and tank area was
also levelled compacted and gravelled.
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