Criblock wall

Criblock wall
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A criblock retaining wall is built using precast concrete elements. They are made into cribs (frames) 1.2m wide
x 0.6m, 0.9m, 1.2m and 1.5m deep. Each crib is approximately 200mm high and filled with stone.
The design principle is gravity, and the design is similar to a gabion basket, except the precast concrete elements add a little more mass.
Concrete criblock walls are typically built by a specialist contractor. A local contractor with some training can also construct them.
Concrete criblock retaining walls are ideal for high retaining structures over 3m high. They are used in highways, rail and housing projects.
Concrete elements
The precast elements to make the cribs are called stretchers and headers. Stretchers run the length of the wall. Headers run from the front to the back on the wall.
The stretchers and headers lock into each other using notches built into the headers.
Stretchers are 1.2m long, whereas headers are 0.65m, 0.95m, and 1.25m long.
Criblock wall design table
The table shows you typical sections of concrete criblock at various wall heights. The table has been developed to calculate budgets. Do not use the table for your project. Every project is different and needs to be designed by a structural engineer.
The higher the wall design, the wider the frames need to be at the bottom of the wall.
Criblock walls are typically inclined to allow gravity to reduce the wall’s mass and keep the design economical.
Free draining fill is required to backfill behind the criblock structure with a land drain at the bottom to reduce any risk from hydrostatic pressure.