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104 Aeroton Road, Aeroton Ext. 2
Johannesburg.

P.O. Box 38041, Booysens, 2016
Gauteng, South Africa.

Tel: 011 226-8400
Fax: +27 11 494-1604

Mozambique:
279, Rua Dar Es Salaam, Maputo,

Tel : +258 21 493 392
Fax: +258 21 493 393

Zambia:
Plot 1329, Independence Avenue, Kitwe

Tel: +260 212 213 377
Fax: +260 212 218 833


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Marine Work

Drilling and Grouting

Moma sands jetty
Mozambique

Client : Kenmare Resources Plc
Consulting Engineers : Multiplex Bateman Joint Venture
Main Contractor : Group Five Ltd
Specialist Foundations Subcontractor : Dura Soletanche Bachy (pty) Ltd
Duration Of Works : September 2005 – June 2006
 

Main Quantities

  • 405m long jetty
  • 95 x 610mm 0 piles
  • 6 x 1,200mm 0 berthing and mooring piles
  • 3,500m vibro-drilled length


Construction of a 405m long jetty, 16m above sea level

As part of the Moma Heavy Mineral Sands development in Mozambique, Dura Soletanche Bachy was awarded Group Five the contract for works involving maritime piling and the construction of a jetty stretching 405m out to sea at an approximate height of 16m above sea level.

Design
The alternative solution selected involved the installation of 95 no piles 610mm diameter metal piles for the jetty and 1,200mm diameter piles for the berth and moorings. The jetty were put in place from the banks using the “leap frogging” progress method: the piling rig moves forward as the piles are installed.

Construction
The steel pontoon sections were assembled on the site, the tubes were transported from Johannesburg to Moma in 12 m sections and then the pile tubes butted welded together to produce 36m long tubes.

Construction works commenced on the bank with the assembly of the RB61 crane and the main carriage “Boggie” specially designed and constructed by Dura Soletanche Bachy to run on rails along the jetty for the purpose of transporting the crane, the pile centering frame that allowed the piles to be installed as per specifications, the PTC50 vibratory driver and its power pack.

The 36 m long piles were collected from the welding area by an RB38 crane and transported the length of the jetty by two transport carriages up to the main carriage of the positioning crane. The piles were then vibration driven to set in one single length down to their final depth under the action of a 6 tonne hammer. Once the piles had been driven in pairs (“bent”) a bolted steel section of pontoon was added to act as a walkway. Every 48 hours, the carriage and the crane advanced by 9m to the next “bent” Nº 46 (92 piles), or a distance of 405m where finally drenched.

The 3 no 610mm diameter piles were constructed along the jetty for a loading area, together with six 1,200mm diameter piles, excavated and concreted for berthing and mooring.

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