Rocklok®

The minimum recommended width is 600mm.

GAP 20 or GAP 40 are probably the best options. Otherwise, use non-cohesive compactible gravel with less than 5% passing the #200 sieve, and a particle size of no more than 40mm.

No. Normally walls built on slopes or with toe-slopes require additional buried blocks. Typically, the minimum distance between the face of the first Rocklok block and daylight should be at least 1.5m (minimum bench). For example, the necessary embedment of a Rocklok retaining wall with a 3H:1V (Run:Rise) slope in front of the wall would require 0.5m (2.5 blocks).

No. The pins and the Rocklok blocks are part of a system and used in combination. The pins are not interchangeable with similar products or components from other retaining systems. Cost, performance, and safety may be affected by the use of elements not certified by Cirtex Industries Ltd.

Non-cohesive clean gravels such as drainage metal 25/7, 20/6, or similar aggregates are the suggested materials to be placed inside the Rocklok open cavities, in the gaps between units, behind the units, and in the drainage column.

These coarse gravels will:

• Provide extra draining capacity
• Release hydrostatic pressure
• Increase the weight of the Rocklok units
• Provide direct interlocking between the Rocklok units and the reinforcement geogrid.

Some contractors might prefer to use scoria. Scoria is a suitable material that provides the drainage capacity. However, it is a very light aggregate, and it does not help to increase the structural stability of the Rocklok units by expanding the system weight as drainage metal does.

Note: It is recommended to avoid the use of rounded rocks like pebbles.

The geogrid reinforcement placement should begin on top of the first course (buried block) and continue every 400mm high (two blocks) until the top of the wall.

As a rule of thumb, for the gravity walls to act as independent structures the recommended distance (wall face to wall face) has to be at least a distance twice the height of the lower retaining wall.

Distance (D) >2×H (lower wall)

Note: This rule assumes the walls do not have back or toe slopes and that they are built in suitable ground as defined in NZS 3604:2011. Terraced walls closer than twice the height of the first wall should be evaluated by a chartered professional engineer.