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670 INSTALLATION OF PILE FRICTION REDUCERS - REPLACEMENT PILES WITHOUT
TEMPORARY CASING

• Sleeve: Install on completion of drilling but before hole is cleaned out.
• Installing pile: Cast within sleeve.
• Grouting: Where required, fill between sleeve and ground.

675 INSTALLATION OF PILE FRICTION REDUCERS - REPLACEMENT PILES WITH TEMPORARY
CASING

• Sleeve: Drill hole and install sleeve.
• Temporary casing: Drive through the sleeve and excavate for pile.
• Installing pile: Cast to 300 mm above bottom of sleeve, remove temporary casing

and cast within sleeve.
• Grouting: Where required, fill between sleeve and ground.

680 INSTALLATION OF PRECAST CONCRETE WALL BEAMS
• Timing: Install in situ concrete supports and allow to cure before installing wall
beams.
• Cut wall beams: Locate ends centrally above supports.
- Width of gap between ends of beams and between ends of beams and
masonry (maximum): site specific.
• Filling to gaps at beam ends: 1:3 cement:sharp sand mortar.
• Hard filling: Complete hard filling above each beam before commencing breaking
out for subsequent beams.

685 INSTALLATION OF STEEL BEAMS
• Timing: Install wall beams and allow surround to needles and hard packing to cure
before commencing excavation for underpinning..
• Hard filling: Complete hard filling above each needle/ beam before commencing
breaking out for adjacent needles/ beams.

TESTING

710 TESTING MORTAR/ CEMENT GROUT
• Standard: To BS EN 445.
- Exceptions: Strength test using 100 mm cubes.
• Preliminary tests: Required if satisfactory evidence of mix suitability is not available
from other sites.
• Frequency of compliance testing: To BS EN 446, clause 8.4.

COMPLETION

910 HEALTH AND SAFETY FILE - MASS CONCRETE UNDERPINNING
• Requirement: Collate and submit a full set of records for inclusion in the health and
safety file.
- Number of copies: Two.
• Content: For each underpinning block record:
- Date of casting.
- Depth of base below datum.
- Length.
- Width either side of wall.
- Details of drains and services built into block and diameter of sleeving.
• Latest date for submission: Within 14 days of completion.

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