31-10-2016, 04:26 PM
1462680239-SheetPileitsApplication.pptx (Size: 902.29 KB / Downloads: 5)
Sheet Pile:
Rolled structural shape with interlocks on the flange tips.
The interlocks permit individual sections to be connected in order to form a continuous steel wall that is earth tight and water resistant.
According to Stanislav (2006)
“Sheet pile walls consist of continuously interlocked pile segments embedded in soils to resist horizontal pressures. Classified as a flexible retaining system, sheet pile walls can tolerate relatively large deformations.”
Uses of Sheet Pile
Sheet piles are being used as retaining systems for many years. They are widely used for several purposes such as:
Large and waterfront structure
Erosion protection
Stabilizing ground slopes
Shoring walls of trenches and other excavations, and cofferdams
Types Of Sheet Pile
According to Material
Wooden sheet pile
Concrete sheet pile
Aluminum sheet pile
Vinyl sheet pile
Steel sheet pile
According to section
Foundation Pipes
Omega section
Z section
U section
Wooden Sheet Pile
Wooden sheet piles are the oldest construction materials used for temporary light structures to prevent cave-ins.
All woods degrades over times, especially when exposed to water and extreme temperatures, where fungus and bugs accelerate decomposition.
Wood sheet piling is still used today, however the wood is either fully encapsulated, or treated with chemicals like chrome, aluminum or steel plating.
Concrete Sheet Pile
Precast concrete sheet piles are more aesthetics but are heavy and produce large disturbance during driving.
Concrete sheet piles are primarily used as bulkheads in either fresh or saltwater, in this case they are normally tied back with dead men.
Rock in close proximity to the ground surface is a concern with this type of sheet pile walls as they are normally installed by jetting.
Aluminum Sheet Pile
Aluminium sheet piles have cross-sections similar to those of steel.
It is constructed using 6061 alloy, and often anodized or painted or visible applications.
Aluminium is 100 per cent recyclable, durable and resistant to corrosion from air, water, extreme temperature and chemicals, but is more expensive than other types.
Vinyl Sheet Pile
Vinyl also known as the “infrastructure plastic,” is the most widely used sheet piling for heavy loads and marine applications today.
Vinyl is not only inert, durable and less expensive than wood, concrete and steel, it is 100 percent recyclable.
Steel Sheet Pile
The steel sheet pile alternative is the most popular due to its strength, ease of handling and ease of construction.
Steel sheet piles are available in various cross-section shapes.
They can have problems with corrosion that can be prevented by coating.
Their thickness is about 10 to 13mm; the allowable stress is 170 Mpa to 210 Mpa (25 – 30ksi).
Why Steel Pile Is Prefer
Resistant to high driving stresses
Relatively lightweight
Reusable
Long service life
Easy to increase length by welding
Joints are less apt to deform; and
Can produce a watertight wall
Foundation Pipes
Effective weight foundation solutions to take vertical bearing capacity and when combined with steel sheet piles, pipe pile
Omega Section
Innovative section allowing installation of sheet pile that is adjacent to existing structure and flexibility of changing profile widths with the wide range of omega section
Z Section
Continuous form of the web and location of the interlock symmetrically on each side of the neutral axis provides positive influence on the section modulus on the Z section
U Section
Symmetrical form of the single element made U section convenient for re-use or even applied as permanent solution
Waterfront Structure
Suitable for offshore construction as it is designed to cater for heavy vertical loads.
Railway And Tunnel
Support structure for railway and tunnel construction
Steel sheet pile helps to minimize excavation and disposal works
Bridge
Can act as foundation and abutment of the bridge
Requiring minimum space and construction time
Basement
Can be used for top down construction (permanent) or bottom up construction (temporary)
Highway Construction
Act as retaining structure for excavation works.
Can be installed easily and extracted anytime. The steel sheet pile can then be re-used and carried forward for later construction stages.
Canalization
Used as support, protection and beautification of river embankment
Can also function as flood protection wall
Advantage
Maintain it shape during installation
Environmentally friendly
Produce with recycled steel
No risk of exposure and disposal of hazardous or contaminated material
Displace soil than remove it
Support of adjacent structure is not compromised due to soil movement
For retention wall, steel sheet piling have excellent stability, especially in area with earthquakes.
Useful in very soft clay soils
Disadvantages
Sections can rarely be 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 disturbance.
Settlements in adjacent properties may take place due to installation vibrations.
Piling Machinery
Service Crane
Sheet Piling Hammer
Placing And Driving Of Sheet Pile
Place sheet pile on that shown in the construction drawings.
Temporary wales, templates, or guide structure have to be carried on to ensure the sheet pile are placed to correct alignment
After sheet pile is set on place, jetting machine will be start driving the sheet piles.
Cutting off and Splicing
Excessive of sheet pile will be cutting-off and removed from site.
Inspection of Driven Pilling
Contractor shall inspect the interlocked joints of driven sheet piles extending above ground.
If the sheet piles are out of interlock, then the sheet piles have to be removed and replaced with new sheet pile.
Conclusion
Sheet pile are the structural tools, where are design to resist horizontal forces as embedded in soils and also used as the retaining system.
They are used of the different materials which plays an important role in their applications.
The steel sheet pile is alternative and the most popular in construction.
The sheet pile also are most advantages and providing higher due it strength.