8.4.3-1
Retaining walls
Component Information
- Code:
- 8.4.3-1
- Sequence:
- 1
- Unit:
- m
- Sub-Element:
- 8.4.3 - 3 Retaining walls
Retaining walls
details, including height (m) above ground, to be stated.
Component Statistics
Measurement Rules
Included Items
Excluded Items
Measurement Rules (6)
Where components are to be enumerated, the number of components is to be stated.
The length of linear components measured is their extreme length, over all obstructions.
Other cost-significant components are to be described and identified separately.Such components are to be measured by area (m2) or linear measurement (m), or enumerated (nr) separately in accordance with the rules of measurement for this sub-element.
Descriptions should include the amount of any PC sum included in the unit rates applied to the item.
Work outside the curtilage of the site is to be described and identified separately.
Where the contractor is only responsible for designing specific elements and/or components of the building project (i.e. not the entire building project), contractor-designed work is to be described and identified separately.
Included Items (20)
Concrete retaining walls, including reinforcement, formwork and design joints.
Fixings cast into or fixed to concrete retaining walls to retain masonry walls (e.g. brickwork,blockwork and stonework) facing wall.
Masonry facing walls to concrete retaining walls (e.g. brickwork, blockwork and stonework), including reinforcement and design joints.
Masonry retaining walls (e.g. brickwork, blockwork and stonework) including reinforcement and design joints.
Crib walls, including timber (including preservative treatment) and precast concrete headers and stretchers, and combined units; and sand and gravel filling.
Gabions, including steel mesh cages/mattresses and wiring together, graded stone filling and filter membranes.
Reinforced earth, including reinforcement layers (e.g. steel, polymeric and geotextile), selected fill material, anchors and soil nails, mesh to support soft landscape facing, concrete, timber facing, etc.
Other types of retaining structure.
Piles associated with external retaining walls (individual, continuous and steel sheet), including piling mats and platforms (installing and removing), piling rigs, cutting off excess lengths of piles or steel sheet piles, cutting out concrete to tops of piles and preparing pile heads and reinforcement, and pile tests.
Trench and pit excavations, including earthwork support (including insertion and extraction of steel sheet piling if used).
Excavating below groundwater level.
Disposal of excavated material, including tipping charges and landfill tax (including inert, non-hazardous and hazardous material where not to be carried out as facilitating works).
Note: where no contamination/remediation strategy report exists, an allowance is to be made within the construction risk allowance for the extra cost of disposing of contaminated material.Disposal of surface water and groundwater.
Consolidating and compacting formation level to receive foundations.
Blinding.
Weep holes.
Land drainage forming an integral part of the retaining wall.
Copings, etc.
Sundry items.
Where works are to be carried out by a subcontractor, the subcontractor’s preliminaries, design fees, risk allowance, overheads and profit, with allowance for these to be made within unit rate applied to element or component.
Excluded Items (2)
Retaining walls that form an integral part of the building (included in sub-elements 1.1.5, as appropriate).
Soft landscape work associated with retaining structures, including provision of topsoil, preparation of topsoil, seeding or turfing, and planting (included in sub-elements 8.3.1 and 8.3.2, as appropriate).
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