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Berrinba Warehouse – MagnumStone™ Gravity Wall

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Project Details

Contractor

McNab

Client

Charter Hall

Engineer

Van der Meer

Location

Berrinba, Queensland

Project Information

Looking to build a large storage warehouse on a newly developed, sloped industrial site, McNab sought a robust retaining wall solution to utilise the maximum usable ground potential. Tight on space, with the proposed warehouse to be built close to the neighbouring boundary, they required a wall that was as vertical as possible, one that could support traffic loadings of all vehicles entering the site and could be built within 1m of the boundary edge.

DESIGN

A large MagnumStone wall was designed, extending the full length of the property with a curved return on the northern corner. A wall of this size would normally be designed as a Mechanically Stabilised Earth structure using StrataGrid reinforcement strips, but due to the volume of site won material that McNab desired to use, a MagnumStone Gravity wall with extenders was designed instead. Being able to use the site won fill in conjunction with MagnumStone gave significant cost savings to the project.

Retained to a maximum height of 8m, the wall rose from the lower, main street entrance level along the full length of the property, then curved tightly to extend along the upper edge of the property adjacent to the road.

The MagnumStone gravity wall design also allowed McNab to put services directly behind the wall.

INSTALLATION

Depending on the retained height of the wall, a mixture of small and large extenders were used. Filled with drainage aggregate and wrapped with DuraForce geotextile, services were laid behind the MagnumStone blocks. Once the wall reached its intended height, the pavement surface was placed on top, with a guard rail right on the edge of the wall.

The ease in which MagnumStone blocks can be handled meant an average of 93 units were placed per day, allowing McNab to quickly retain the entire side of the property, giving stable vehicle access to the newly developed site.

The MagnumStone system provided the following benefits to the project:

  • Quick, safe and easy to place with the use of a small excavator
  • Can be placed close to boundary edges
  • Near vertical face for retaining maximum land use

Products used in this Project