INSTALLATION GUIDE
GRASSGRID DESIGN CONSIDERATIONS
GENERAL PRINCIPLES Installation design for Grassgrid Ground Reinforcement system varies according to the following factors: Application type Anticipated loadings (if trafficked) Nature of existing sub-grade Degree of gradient (if relevant to application type) APPLICATION TYPES Vehicular traffic including: Pedestrians Private cars Light commercial vehicles (including light aircraft) Emergency vehicle access Maintenance vehicles access HGV applications Overspill car parks Gradients including: Cuttings/slopes Motorway embankments Spillways (for flood control works) Water courses including: River bed reinforcement Restraining bank construction Existing bank stabilisation
GRADIENTS Edge restraints are recommended in all applications. With edge restraint: Half-bonded laid up slope, starting from an edge restraint along foot of gradient
LAYING DESIGN The recommended laying design of Grassgrid units is influenced by the specific application type and circumstances: Vehicular traffic Half-bonded – preferably in a restrained area. Edge restraints Edge restraints are recommended wherever possible, especially for heavier loading applications. Sub-grade Stability of sub-grade needs to be assessed as this will affect sub-base requirement. Sub-base If sub-grade is stable: No sub-base required (for lighter loadings only) (see Fig 1) If sub-grade is not stable: Material: granular sub-base type 1 For heavier traffic applications: see Fig 2 and refer to our Technical Department for guidance Laying course Material: sharp sand and (if available) loam (1:1 mix). Compacted depth: 20mm.
(see Fig 3). Sub-grade
Units Staggered vertical jointing plus every 2nd or 3rd row staked with 500mm propriety high pressure impregnated timber pegs of minimum length 500mm or propriety galvanised steel pins to ensure stability. Edge restraints are required for all gradients unless shore restraint pins are used (see under Laying design and Figs 3 and 4). Condition of the sub-grade needs to be assessed as this will affect sub-base requirement. It should be stable, compact and rock-free. Sub-base If sub-grade is stable: No sub-base required. Grassgrid may be laid directly onto sub-grade Laying course Required if laying on sub-base, otherwise optional: Material: sharp sand and (if available) loam (1:1 mix) Compacted depth: 20mm Without edge restraint:
Laying course (optional)
Laying course
PCC Edging
Sub-grade
Laying course (optional)
Laying course
Units
Laying course (optional)
Laying course
Laying course
Units
PCC Edging
Sub-grade
Sub-base
Laying course (optional)
PCC Edging
Sub-grade
Sub-grade
Units
Metal pins or wood placed every 2 or 3 as shore restraints
Fig 1. Light vehicular trafficked – no sub-base.
Fig 2. Heavier trafficked – with sub-base.
Fig 3. G radients – with edge restraint.
Laying course
Laying course
Sub-base
Laying course (optional)
Sub-grade
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Units TECHNICAL INFORMATION: charcon.technical@aggregate.com
Sub-base
Laying course (optional)
Metal pins or wooden stakes placed every 2 or 3 rows to act
Sub-grade
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