Construction methodology for excavation & pilling on a hilly Terrain

Hi Sankar

My reference to demolishing secant piling was for the temporary cantilevered piles that are holding up the higher platforms.

The haul road would have to be a hairpin traverse across the slope - no mean feat of engineering in itself.

Consider the option of cutting back to the batter and the bottom formation and stabilising the slopes with pinned back reinforced grout.

It is best to use an earthfill piling platform if at all possible but if the loose end cannot be restrained by natural repose or support piling then a space frame platform may be the best option.

You really need the input from a qualified strucrural engineer so I suggest you take this problem in that direction.

Best regards

Mike Testro

Hi Sankar

Two other methods are worth considering.

1.  Temporary piling platforms formed by braced scaffolding falsework.

2.  Excavated battered slope stabilisation using pinned reinforced sprayed grout.

Don't forget - always get the design and methods checked by a qualified strucrural engineer before chosing the best method.

Best regards

Mike testro

Hi Sankar

With the possibility of landslides you must either use a battered deep excavation beyond the natural angle of repose of the soil - this depends on the size of your site.

Or you can use a series of retaining wall to hold back the excavated surface to create a level piling platform.

Always start from the bottom and work upwards.

The retaining walls could be steel sheet piling with earth anchors and walings or conctete using secant piling.

I would suggest secant piling as the same rig can be used for this and the structural piles.

Remember that a secant pile is not structurally sound until it has its insitu ring beam constructed and cured.

If the thin white line on your drawing is the natural gound level then at the level of the 3rd flight of stair there is a relatively flat profile which can be made level by cut and fill.

From this you can drive the lower level piles over to the end of the lift shaft using bilnd boring to reach the level of top of the structure support piles and cantilevered retaining piles up to the next two levels. - Stair 5.

Using backfill you now create your second platform and re do the same process up to stair 9.

When you have all your piles in place you can start the excavation to the formation profile within the retaining walls breaking out the temporary suppourt piles as you go.

All of this has to be designed by a qualified structural engineer.

The planning problems are quite tricky especially as you have to allow for curing times of the ring beams and vertical haul roads for the rig access.

Best regards

Mike Testro

Dear sankar vijayan,

 i am karthik from chennai, could u explan what is manhour for excavation, pcc, rcc, backfilling other civil works,

1unit excavation = (manhour) how many manhour

like that above mentioned all, pls explain

j.karthik

nscl

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