[GT-PPT] Deep Excavation Presentation 20150317

Megaworld Salcedo Skysuites

SOIL EXCAVATION PROTECTIONSMegaworld

OUTLINERetaining Wall SystemsSheet Pile WallsSecant Pile WallsDiaphragm Walls

SHEET PILE WALLS

earthworks.us

SHEET PILE WALLSAdvantages:HIGH RESISTANCE to driving stressesLIGHT WEIGHTREUSABLE on several projects.LONG SERVICE LIFE above or below water with modest protection.Easy to ADAPT the pile LENGTH by either welding or boltingJoints are LESS apt to DEFORM during driving.

SHEET PILE WALLSDisdvantages:RARELY used as part of the PERMANENT structure.Installation of sheet piles is DIFFICULT in soils with boulders or cobbles. In such cases, the desired wall depths may not be reached.Excavation SHAPES are dictated by the sheet pile section and interlocking elements.Sheet pile driving may cause neighborhood DISTURBANCESETTLEMENTS in adjacent properties may take place due to installation vibrations

SECANT PILE WALLS

http://www.secantpile.com

http://www.bylandengineering.com/

SECANT PILE WALLSAdvantages:Increased construction alignment FLEXIBILITY.Increased wall STIFFNESS compared o sheet piles.Can be installed in DIFFICULT GROUND (cobbles/boulders).Used in high WATER TABLE conditions without excessive dewatering.Properly placed columns can be as CLOSE as 3 to 5 from existing buildings.Less NOISE

SECANT PILE WALLSDisdvantages:VERTICALITY tolerances may be hard to achieve for deep piles.Total WATERPROOFING is very difficult to obtain in joints.Increased COST compared to sheet pile walls if depth is less than 12 meters.

DIAPHRAGM WALLS

http://menardbachy.com.au/

http://bagtc.com/

DIAPHRAGM WALLSAdvantages:Used for retaining very DEEP EXCAVATIONS as they can be designed to take very HIGH structural LOADS.The water tight walls formed can be used as permanent structural walls. Reduced number of joints in the wall which ultimately improves the walls WATER TIGHTNESS.Work may be carried out right against existing structures and the line of wall may be adjusted to any SHAPE in plan.Diaphragm wall construction is relatively QUIET, and minimum noise and vibration levels make it suitable for construction in urban areas.

DIAPHRAGM WALLSDisdvantages:Requires HEAVY construction EQUIPMENTConsiderably HIGH COSTRequires LARGE SPACE for storage of reinforcements cages.Need for CONTINUITY in the construction process.

http://www.fletcherconstruction.co.nz/

SUMMARRYComparisonSheet PileSecant PileDiaphragmCostCheapestModerate - HighHighNoise and VibrationYesMachine OnlyMachine OnlyMatls and Eqpt.LowModerateHighWater TightnessGood with Joint TreatmentSatisfactoryExcellentFlexibilityLowHighHigh