Harbour Arch precinct will encapsulate the principles of new urban living, and present an opportunity for people to live, work, play, relax, and stay in a safe, convenient, enjoyable and sustainable community-focused environment.

earth retention using CFA piles, jet grout sealing columns, anchors, gunite and temporary cased bored piles

The project

Harbour Arch is a mixed-use development. Its six towers will be located alongside landscaped public spaces bustling with shops, restaurants, cocktail bars, international hotels, offices, health clubs and the largest selection of residential apartments in the CBD.

The challenge

Maintaining operational entities alongside the site, dealing with live services and managing the interface thereof with the client, City of Cape Town and Transnet. This included the protection of services of neighbouring buildings as well as working adjacent to and under live fibre and electric cables, sewers and water line. 

Strong ground water was dealt with by well engineered solutions, including jet grouting to seal the basement. 

Other challenges were the variable rock strengths encountered during the installation of the foundation piles and the demolition of old foundations including the removal of existing floor slabs. 

The solution

The project involved the installation of CFA soldier piles with jet grout columns, anchors and gunite for lateral support.  Large diameter temporary cased bored piles were installed for the foundations with loads of up to 16000kN.

Project facts


Harbour Arch Investments

Keller business unit(s)

Keller South Africa

Main contractor(s)

Franki Geotechnical (Pty) Ltd.