Civil Engineering Focus on Geotechnical Engineering
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LanguageEnglish
Pages78
FormatPDF
Size3.86 MB

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Civil Engineering Focus on Geotechnical Engineering



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Preface to Civil Engineering Focus on Geotechnical Engineering

WHILE MANY OF its competitors are at sea when it comes to implementing successful marine solutions, Franki Africa,

part of the JSE-listed Esorfranki group, has its feet firmly on the ground, successfully delivering solutions in this challenging environment.

Some of the company's most successful contracts in the last decade are a testimony to this.

These projects include the installation of foundations for a shipbuildingand repair yard, a quay wall and a dry dock in the Port of St Louis in Mauritius;

the Frois Des Mascareignes job, also in Mauritius, which involved major expansion to the existing berthing facilities;

in the Seychelles the Tuna Quay where the quay was extended more than 200 m and by more than 1800 m2.

And the demanding R213 million Transnet-designed Berth 208 in the Port of Richards Bay.

So, when it came to the piling and foundation work for the extension into the sea of Durban's Sandile Thusi (Argyle) Road stormwater outflow pipe (known as the 'shotgun pier' because of its double-barrelled structure),

it was no surprise that Franki was asked by all the tenderering main contractors to quote as the specialist subcontractor for this work.

Ultimately the contract was awarded to Esor Africa, Franki's stable- mate in the Esorfranki group. Franki did the temporary works and iling 20 years ago,

when the original out- flow was constructed. In the 20 years since the 'shotgun' was first constructed, there demanding R213 million Transnet- designed Berth 208 in the Port of Richards Bay.

So, when it came to the piling and foundation work for the extension into the sea of Durban's Sandile Thusi (Argyle) Road stormwater outflow pipe (known as the 'shotgun pier' because of its double-barrelled structure),

it was no surprise that Franki was asked by all the tenderering main contractors to quote as the specialist subcontractor for this work.

Ultimately the contract was awarded to Esor Africa, Franki's stable-mate in the Esorfranki group. Franki did the temporary works and iling 20 years ago, when the original out- flow was constructed.

In the 20 years since the 'shotgun' was first constructed, there have been significant sand deposits on this stretch of beachfront, effectively leaving the outlet in the middle of the beach.

This has necessitated its extension back into the sea, to prevent silting-up and further flooding back in the stormwater system.

The basic scope of works was to design and construct both a temporary jetty and co fferdam with a 5 m high protection wall for the construction of the extended concrete 'shotgun' outfall.

These two critical components not only allow for the construction of the permanent structure.\

But also ensure access and a safe working environment for the main contractor. "While on the face of it the task doesn't seem that complicated,

working in the ocean is obviously never easy and several factors complicate the production process and make accuracies very chal lenging.

" says Marcel Hofmann, Franki's Durban divisional manager The temporary jetty, a key element in this contract, is 70 m long and needed to be sufficiently strong to support two tracked 80 t crawler cranes.

This was achieved by installing 28 steel tube piles in pairs for the legs of each jetty section.

The process requires a guide frame, which assists with the positioning of the piles, and then, with the right equipment,

they are installed to the required depih," says Ilofmann, aling thai th constrinitial protection from the sea and access to ihe jeiy throughont the project as achieved using sheet piles. uction of an abutment to provide

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