Timber Pole Retaining Wall Design Nz

The design of these walls is relatively straight forward but several modes of failure need to be considered.

Timber pole retaining wall design nz. The poles may also be of steel section for more heavily loaded walls. Timber poles spaced at 1m centres. Poles are typically spaced between 900 and 1 800 mm and set in concrete see figure 5. Once you ve drawn up your plan measure the quantity of materials you ll need and order them.

Embedded footing cantilever walls may be built from round or square h5 treated timber or precast concrete poles or i beams. Use this step by step worked example 1 to design a cantilever timber pole wall for residential sites. Design and draw up a plan of the retaining wall you want to build including. Handrail only required if fall height is over one metre.

It was presumed that this condition aligns with resource consents requirements especially for retaining walls at the. Active pressure used for design of timber pole retaining walls and at rest pressure used for design of concrete block retaining walls. Laserframe structural timber pinex retaining wall the pinex range of products has been designed to blend superbly into any style of backyard or home and include. 4 timber retaining wall material new zealand pinus radiata a ttt poles ttt sed poles peeled naturally tapered are available as normal or high density poles with a minimum taper of 6mm m as per nzs3605 2001 and treated to a minimum cca hazard class h5 as per nzs 3640 2003.

Unilog poles machined uniform diameter are available as. Timber wall durability council has in the past required h6 treated timber for pole retaining walls. Round or square posts this will determine post spacing and hole depth. The reason is to ensure that the retaining wall would have an expected service life of at least 100 years.

And in high risk loadbearing applications piles house foundations retaining walls and in decking piles vineyard supports veranda posts poles. Wide footing cantilever retaining walls may be built using in situ reinforced concrete or precast masonry blocks. Treatment level application typical uses h4 for timber exposed to the weather and in ground contact fence posts pergola post retaining wall tgv and lumber h5 for timber exposed to the weather ground and fresh water contact. 2 frame square fence posts rails and palings.