Underpinning

Underpinning is to replace existing weak foundation

• TRUE

• FALSE

Underpinning is to transfer building load from existing lower depth to higher depth

• TRUE

• FALSE

Which of the followings are reasons for underpinning operation?

• Faulty building foundation

• Soil settlement

• Increase in building load

• Changes in soil bearing capacity

Which of the followings underpinning technique are suitable for both strip foundation and pad foundation

• Traditional underpinning

• Jack pile underpinning

• Needle and pile underpinning

• Pynford stool underpinning

• Root pile underpinning

The statement "to prevent fracture or damage of the wall, the underpinning work should always be carried out in short lengths called legs or bays" is describing ...

• Traditional underpinning

• Jack pile underpinning

• Needle and pile underpinning

• Pynford stool underpinning

• Root pile underpinning

This type of underpinning is quiet, vibration free and flexible since the underpin depth can be adjusted to suit subsoil conditions encountered.

• Traditional underpinning

• Jack pile underpinning

• Needle and pile underpinning

• Pynford stool underpinning

• Root pile underpinning

This type of underpinning can be used where the condition of the existing foundation is unsuitable or badly damage

• Traditional underpinning

• Jack pile underpinning

• Needle and pile underpinning

• Pynford stool underpinning

• Root pile underpinning

This type of underpinning enables the wall to be underpinned in a continuous run without the need for needles or shoring

• Traditional underpinning

• Jack pile underpinning

• Needle and pile underpinning

• Pynford stool underpinning

• Root pile underpinning

This type of underpinning use bored pile as part of its new supporting structure

• Traditional underpinning

• Jack pile underpinning

• Needle and pile underpinning

• Pynford stool underpinning

• Root pile underpinning

Which of the following diagram showing needle and pile underpinning technique

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