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Riprap & slope protection

Mortared, gabion and loose riprap for slope stabilisation, erosion control and drainage protection.

What the work covers

Every item below is executed to the approved drawings and specification.

  • Mortared riprap for slope protection and erosion control
  • Gabion riprap and retaining structures
  • Loose riprap and free-draining stone placement
  • Slope stabilisation and embankment protection
  • Drainage channel and watercourse protection
  • Riprap maintenance and rehabilitation
Crew bedding armour stone into mortar on a graded slope
Crew bedding armour stone into mortar on a graded slope

Materials used

Everything is approved by submittal before it reaches site.

  • Sound, angular quarried stone, well graded and free of fines
  • Non-woven geotextile filter fabric
  • Graded aggregate bedding between filter and armour
  • Cement mortar where the section is grouted

Where it is used

The situations this package is normally called for.

  • Embankment and cut-slope protection
  • Wadi crossings and channel linings
  • Culvert inlets, outlets and aprons
  • Bridge abutment and pier scour protection
  • Shoulder and verge erosion control

Registered activity and the scope of this work

The company’s commercial registration is issued for building and construction contracting (activity 410001). This package is undertaken within the scope of that registration, the licences in force, and the client’s own approval requirements. Where a package needs an activity or approval we do not currently hold, we say so before pricing rather than after award.

How this is built

A drawing of the method, not a photograph of a completed job.

Riprap and slope protection - typical cross-section A cut through a protected embankment showing compacted subgrade, geotextile filter, graded aggregate bedding, the armour stone layer, a toe trench anchor and the slope drain behind the works. Carriageway Armour stone layer Interlocking, placed not dumped Graded aggregate bedding Grades between filter and armour Geotextile filter Retains fines, passes water Compacted subgrade Toe trench anchor Keys the blanket against sliding Slope drainage outlet Relieves pore pressure Filter laps run downslope, upper sheet over lower. Indicative only - not to scale
Typical section through a protected slope: filter, bedding, armour, toe anchor and drainage.

How this work is run

Before mobilisation

A method statement and risk assessment written for this scope, material submittals approved, manpower and plant confirmed.

While the work runs

Daily supervision, stage inspection against the drawings, and site controls enforced whether or not the client’s representative attends.

At handover

Inspection and test records, as-built drawings, and the defects liability period honoured in writing.

Have works that need pricing?

Send us a scope, drawings, or tender documents and we will come back with a detailed quotation.