Sheet Piles
SHEET PILES
Sheet Piling is used in cases when-
Enclosing a site or part thereof to prevent the escape of loose sub-soil to safeguard against settlement of structure which is to be erected on it.
Retaining the side of trenches and generally excavations.
Forming cofferdams (watertight enclosures necessary in construction of foundations in water). Their most common use is within temporary deep excavations. They are considered to be most economical where retention of higher earth pressures of soft soils is required.
They have an important advantage in that they can be driven to depths below the excavation bottom and so provide a control to heaving in soft clays or piping in saturated sands.
However sheet piles are more costly and less adaptable to hard driving conditions particularly where boulders or irregular rock surfaces occur.
There are 3 main types of sheet pile walls.
Cantilever
Anchor
Propped
Sheet pile are either of-
Steel
Reinforced concrete
Timber
STEEL SHEET PILES
Trough shaped when driven,the piles are interlockedwith alternate one reversed.
Lenghts- 5.5m for smaller sections 18m for larger sections
The maximum lengths of piles depend upon,
The depth of penetration
Nature of soil
Made of three grades of steel, e.g. mild steel, copper steel and high tensile rust-resisting steel.
When used for permanent work the piles should be coated with acid free tar or similar preservatives. Steel sheet piles Sheet piling driving
DRIVING SHEET PILES
The frame equipment is similar to that of other types of piles, but of lighter construction.
The hammers employed are to be of single-acting type for clay soil.
Double-acting for sand and gravel soil.
Alternatively, in the absence of a frame, hammer suspended from the jib of a crane can be used.
A driving cap or anvil block is used as a protection against damage.
In order to maintain a straight line of vertical piles, it is necessary to provide one or two pairs of horizontal timbers, called waling,
Sheet Piling is used in cases when-
Enclosing a site or part thereof to prevent the escape of loose sub-soil to safeguard against settlement of structure which is to be erected on it.
Retaining the side of trenches and generally excavations.
Forming cofferdams (watertight enclosures necessary in construction of foundations in water). Their most common use is within temporary deep excavations. They are considered to be most economical where retention of higher earth pressures of soft soils is required.
They have an important advantage in that they can be driven to depths below the excavation bottom and so provide a control to heaving in soft clays or piping in saturated sands.
However sheet piles are more costly and less adaptable to hard driving conditions particularly where boulders or irregular rock surfaces occur.
There are 3 main types of sheet pile walls.
Cantilever
Anchor
Propped
Sheet pile are either of-
Steel
Reinforced concrete
Timber
STEEL SHEET PILES
Trough shaped when driven,the piles are interlockedwith alternate one reversed.
Lenghts- 5.5m for smaller sections 18m for larger sections
The maximum lengths of piles depend upon,
The depth of penetration
Nature of soil
Made of three grades of steel, e.g. mild steel, copper steel and high tensile rust-resisting steel.
When used for permanent work the piles should be coated with acid free tar or similar preservatives. Steel sheet piles Sheet piling driving
DRIVING SHEET PILES
The frame equipment is similar to that of other types of piles, but of lighter construction.
The hammers employed are to be of single-acting type for clay soil.
Double-acting for sand and gravel soil.
Alternatively, in the absence of a frame, hammer suspended from the jib of a crane can be used.
A driving cap or anvil block is used as a protection against damage.
In order to maintain a straight line of vertical piles, it is necessary to provide one or two pairs of horizontal timbers, called waling,