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Auger Boring (Vertical Piling) for Shaft Excavation

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Status: Implemented

MT shaft excavation by break excavators, for the depth of 12 meters and above, requires widening of excavation dimensions which is resulting in more duration, more excavated materials, more foam concrete backfilling, more disruption to public and finally more cost in overall. Using this technique results in 60% additional unwanted excavation as the area highlighted in red hashing below. MT works are usually on critical path and significantly affecting baseline and zones delivery.

Quantitative Outputs:

*Noise level measurement was conducted on spot just next to the excavation machines. NOT AT RESIDENT’s HOUSES.

It is noted that:

Piling technique is 9% more cheaper than excavation by breakers as an overall process.
Piling technique saves around 34% of total duration comparing to breaker technique.
Piling technique produces less noise and dust by 30% which is a great achievement for less public disruption.

Piling Excavation Sequence of Work:

First, piling machine will excavate the shaft as per the arrangement shown .The piling machine will start with the piles located at the center of the shaft to maintain a stable platform to stand on.
Second, jackhammer, bucket and long boom excavators will be used to excavate the remaining portions between the piles. Dewatering system will be installed during this process whenever needed.
Third, mini jackhammer will be used to trim the shaft edges at the lower depth to prepare a smooth surface for front and back walls.

Traditional Breaker Sequence of Work:

First, Breaker will excavate a shaft of 8 x 13m. Then it will go deeper and deeper inside the shaft till it reaches 12m depth as shown in Sketch 1 (Excavation Cross Section).
Second, breaker will excavate a box of 5.2x7.5m for more 5m where the MT machine will be set up.
Third, breaker will be removed from inside the shaft using mobile crane.
The excavated materials will be taken out of the shaft using Long Boom or/and basket bucket.

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Geographical Location	N/A
Area	N/A
Sector	Auger Boring and Tunneling Technology
Status	Complete
View On Map	On Site Construction
Start Date	N/A
Construction company	N/A
Consulting company	N/A

Auger Boring (Vertical Piling) for Shaft Excavation

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Project Description

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Technology Information