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220 BEAM AND MASS CONCRETE PIER UNDERPINNING
• Beams: Contractor's choice.
- Size: site specific.
- Location: site specific.
• Piers:
- Depth: site specific.
- Length: site specific.
- Width on either side of wall centre line (minimum): site specific.
- Depth of hard pack: site specific.
- Gap face to face of piers (maximum): site specific.
• Materials:
- Concrete: site specific.
- Hard packing: site specific.
Water content: Sufficient only to ensure that packing binds together.
• Curing period (minimum):
- Between casting underpinning block and pinning up: site specific.
- Between completion of pinning up and commencement of excavation for the
next sequence of underpinning: site specific.
Extend curing periods to allow for inclement weather.
• Drains/ Services: Locate piers to avoid. Give notice if drains/ services will pass
through beams.
• Features: site specific.

TYPES OF PILING

310 PILES
• Standard: To SPERW, sections B2–B6, as appropriate to the pile type.
• Permitted types: Contractor's choice.
• Project specification: Submit proposals to cover the requirements of SPERW in
clause B1.2 and listed under this heading for the chosen pile type.
• Other requirements: None.

ACCESSORIES FOR UNDERPINNING

410 PRECAST CONCRETE BEAMS
• Standard: BS EN 13369.
• Type: Contractor's choice.
- Composite action: Permitted.
• Details:
- Cross section: Submit proposals.
- Lengths: Submit proposals.
- Loading conditions: Submit proposals.
• Exposure conditions: site specific.
- Cover to reinforcement/ tendon (minimum): To suit exposure conditions.
- Protective treatment to end of beams: site specific.
• Cutting on site: Saw cutting permitted.
• Hard packing:
- Depth: site specific.
- Material: site specific.
- Curing period (minimum): site specific.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01