What do I need to know before starting the install of a Stonebloc wall?

This article contains some helpful advice on what you should consider before commencing the installation of a Stonebloc retaining wall.

What to Expect:

• Stonebloc is designed to provide a rustic, stone aesthetic with a fast installation. Like all precast concrete products, the blocks are not millimetre precise. Each block has about 5mm play, this means;

• You will see minor gaps between the blocks, this is normal and the blocks will settle over time.
• The texture on the block and the bevelled edges are specifically designed to conceal any minor gaps in the wall.
• The wall needs to be constructed vertical, this means you may need to use precast concrete packing shims during construction to allow for minor variations. It is the installation contractors role to use there skill and experience to make the product work on site. 
• Envirocon produces hundreds of blocks per week. While we hand check every block, sometimes defect blocks get through our QC system and end up on site. If a block is not fitting properly, put it to the side and ask for a replacement. 
• If in doubt, refer to Stonebloc QC guidelines attached at the end of this document. 

Lifting Klaws

 
Stonebloc blocks are lifted using a Ancon® lifting klaw. The lifting klaw is easily connected
to the anchor head by admitting the anchor head into the slot of the lifting klaw and
rotating the tab of the lifting klaw until is rests on the concrete surface.

The klaw is designed so that it cannot accidentally disengage while under load. Despite
this care should be taken when lifting.

Transportation and Shock Loading

Transporting loads over uneven terrain can induce anchor loads that are 5 times greater
then those calculated from weight of the concrete element. Minimise the potential for shock loading by placing the pallets as close to the installation point as possible.

Chains

 
Chains are used to connect the lifting clutch to the lifting point on the lifting machine.
Only certified chains should be used to lift blocks. 

Before lifting, chains should be inspected for:

• Current test tag
• Corrosion
• Worn, Stretched, or deformed links
• Worn, stretched or deformed hooks and fittings
• Wear on load pins and to ensure retainers are installed correctly
  
  

Operators and installers should refer to relevant codes of practice issued by local health and
safety regulators

 
Excavator

Where an excavator is used to lift and maneuver the blocks, the chain should be attached
to the end of the excavator arm via a certified connection, preferably without the bucket.

 
Angle of Chains

When lifting a block with one lifting anchor the chain hangs vertically from the attachment point on the machinery.

 
When lifting block with two or more lifting anchors chains are used to connect the lifting klaws to the machinery. The angle at which these chains hang from the machinery impact the load capacity of the lifting anchors. At a minimum both chains should be the same length.

 
As a minimum the angle at which the chains hang from the machinery should be no greater
then 60°.