Advantages and disadvantages of different piles; concrete piles
1.Wood piles & concrete pile
2. Prefabricated concrete pile (reinforced) and prestressed concrete pile. (driven) affected by groundwater conditions.
3. Driven and cast-in-place concrete pile Permanently cased (casing left in the ground) Temporarily cased or uncased (casing retrieved).
4.Bored and cast in -place (non -displacement piles)
5.Steel piles (Rolled steel section)
1. Wood piles:[Advantages and disadvantages of different piles]
- The piles are easy to handle.
- Relatively inexpensive where timber is plentiful.
- The Sections were joined together and excess length easily removed from the piles.
The piles will rot above the groundwater level. Have a limited bearing capacity.
- That was Can easily be damaged during on driving by stones and boulders.
- The piles are difficult to splice and are attacked by marine borers in saltwater.
2. Prefabricated concrete piles (reinforced) and prestressed concrete pile. (driven) affected by the groundwater conditions
- Do not corrode or rot.
The concrete piles Are easy to splice. Relatively inexpensive.
- The quality of the concrete is can be checked before driving the concrete pile.
- This type is Stable in squeezing ground, for example, soft clays, silts, and peats pile material can be inspected before the piling.
- Construction procedure was unaffected by groundwater. for the concrete pile.
- Relatively difficult to cut.
- Can be damaged during driving. Replacement piles may be required.
- Sometimes problems with noise and vibration in a concrete pile.
- Cannot be driven with very large diameters or in the condition of limited headroom.
3. Driven and cast-in-place concrete pile Permanently cased (casing left in the ground) Temporarily cased or uncased (casing retrieved):
- Can be inspected before the casting can easily be cut or extended to the required length.
- Relatively inexpensive.
- the concrete pile is Low noise level.
- The concrete pile can be cast before excavation.
- Pile lengths are readily adjustable.
- An enlarged base can be formed which can raise the relative density of a granular founding stratum leading to much higher-end bearing capacity.
- The Reinforcement is not described by the effects of handling or driving the stresses.
- Can drive with closed-end so excluding the effects of GW.
- The heave of the neighboring ground surface, which could lead to reconsolidation and the development of negative skin friction forces on piles.
- The concrete pile’s Displacement of nearby retaining walls. Lifting of previously operate piles, where the penetration at the toe has been sufficient to resist upward movements.
- Tensile strength of damage to unreinforced piles or piles consisting of the green concrete, where forces at the toe have been sufficient to resist upward movements.
- The Light steel section or Precast concrete shell be damaged or distorted by hard driving.
- Cannot be driven where the headroom is limited.
- Relatively expensive.
- Time-consuming. Cannot be used immediately after the installation.
- Limited length.
4.Bored and cast in -place (non -displacement piles):
- The Length can be readily varied to suit various ground conditions in a concrete pile.
- Can be installed in very large diameters.
- End enlargement up to two or three diameters is possible in clays.
- The material of piles is not dependent on handling or driving conditions.
- Can be installed in very long lengths.
- Can be installed without appreciable noise or vibrations.
- Can be installed in conditions of very low headroom.
- No risk of ground heave. Susceptible to “waisting” or “necking” in squeezing ground in a concrete pile.
- Concrete is not placed under ideal conditions and cannot be subsequently inspected.
- The Water under artesian pressure may pipe up and pile shaft washing out cement.
- The Enlarged ends can not be formed in cohesionless materials without special techniques.
- Cannot be readily extended above ground level especially in the river and marine structures.
- The Boring methods may loosen sandy or gravely soils and requiring base grouting to achieve economical base resistance.
- Sinking piles may cause loss of ground I cohesion-less leading to the settlement of adjacent structures.
5. Steel piles (Rolled steel section) :
- The piles are easy to handle and can easily be cut to the concrete pile’ desired length.
- Can be driven through dense layers. The lateral displacement of the soil during driving is low (steel section is H piles and I section piles) can be relatively easily spliced or bolted.
- Can be driven hard and in very long lengths.
- Can carry heavy loads.
- Can be successfully anchored in sloping rock.
- Sometimes the Small displacement piles particularly useful if ground displacements and disturbance critical.
- The piles will corrode,
- Will deviate relatively easy during driving.
- Are relatively expensive.