Topic 4.2.2 Flashcards
Why are micropiles used
To provide structural support
To underpin foundations
To transfer loads
To enhance mass stability
How small are micropiles
Less than or equal to 300mm in diameter
Capabilities of PIT
Defects can be discovered at an early stage
Testing can be carried out on any accessible pile
The method is quick and economical
Large number of piles can be tested in a single day
Limitations of PIT
Test does not give any information about bearing capacity under load
Minor deficiencies may not be discovered
Presence of debris at pile toe cannot be detected
Gradual changes in cross section may not be detected
Cycles of static load test
1st cycle - 1.5x Design Load
2nd cycle - 2.0x Design Load
3rd cycle - Ultimate load / 2.5-3.0x Design Load
Compression test for pile
Kentledge system
Tension and compression test for pile
Reaction frame system
How can reactions be applied for reaction frame test
Tensile piles
Ground anchors
What should pile layout plan show
Types of pile and specifications of material
Allowable total and differential foundation settlement
Location of piles and site investigation boreholes
Allowable variation limit during installation
What does QP have to ensure during pre-construction
Builder submits a vibration monitoring plan showing locations of vibration monitoring devices with stipulated vibration limit stated
What does QP have to submit to BCA for record
Vibration monitoring plan
