Rockfall protection wire netting system

Rockfall protection wire netting system,also named heavy hexagonal wire netting for slope protection,isused to prevent rocks and debris from falling.The mesh is flexible,durable and easily

conforms to the rock face profile.

The steel wire used in the manufacture of Rockfall protection wire netting is heavily zinc

coated or PVC coated according to ASTM A975, PVC coating is extruded over the galvanized

wire to provide extra protection for use in complicated environments such as acidic soils or

water,in salt water or wherever the risk of corrosion.The PVC coating has a nominal

thickness of 0.55mm.

Rockfall protection wire netting system is made of hexagonal woven wire mesh type 80

commonly referred to as double twist mesh as ASTM A975. It is supplied in standard length

and width.

Mesh ;80 x100 mm

Wire dia 2.7 mm

Rockfall protection netting system

Rockfall protection netting system is necessary wherever people or equipment may be located

at the base of a rock face. This is a serious issue because the majority of people who are

killed or seriously injured as a result of rockfalls are affected by small rather than large

pieces of rock.

There are a variety of measures that can be used, including:

Rock traps in the form of ditch and barrier type structures. Often the barrier is simply a

low bank of waste rock or soil.

Placing waste rock against a face, known as slope buttressing (although the stability of the

waste rock also needs to be considered).

Surface protection such as spray concrete, netting, rock bolts or other anchors.Face scaling, ie the controlled removal of loose rock

Intermediate benching, ie the formation of ledges across the face.

Pre-split blasting, ie a method of blasting which results in a less broken surface to the

rock face. However this does not overcome any underlying stability problems, such as weak

layers, within the face and it can be unsightly.

In some circumstances the rock face itself may be of geological importance (it may be a

geological SSSI) and therefore should not be obscured. This will prevent the use of some

surface protection measures, such as netting or spray concrete, and alternatives will need

to be considered. A compromise may be reached by using netting above the key location, for

example, while leaving the important part open.