how to design a concrete bracing system for a secant piles shoring?

[francois23]

i have a project where i have design the
1.shoring system as secant piles
2. due to surrounding restriction i cannot drill anchors for support
3. we are expecting the excavation will stop at -4m for 2 years because the neighbor site after drilling 4 m they found some old remains(monuments) and the project has been stoped ( the entisipated time is 2 years)
4. the shoring will be for only 3 sides where the side of the neighbor where they found some old remains already has a wall of drilled piles.

please give me some advice on how to design the concrete beam for the bracing system.

 

[francois23]

my site dimentions are 20.5m by 22.5m

 

[InDepth]

Cant you make this height work for a cantilevered system?

Other options inclde Internal diagonal braces (footing in excavation) or cross lot bracing (horizontal steel tubes as braces).

 

[irawanfirmansyah]

If there is no surrounding building which is sensitive to settlement, you can adopt cantilever secant piles.
Otherwise, I suggest to use rakers with top end at -1m.

 

[kieran1]

As irawanfirmansyah says rakers and also knee braces at the corners.

Kieran