The bored piles are constructed by circular cross-section drilling and by placing reinforcement and concrete in the soil.

 

 

Bored piles can be constructed by using various capacity and sizes machinery and equipments, depending on factors such as; soil and groundwater conditions, diameter, capacity and the length of the pile. Bored piles are drilled by bentonite mud or casing depending on the ground conditions during the drilling, and length of the piles and the capacity of the equipment.

 

After drilling, bentonite mud is desanded the reinforcement cage is lowered into the drill with the help of a crane and is placed in the specified elevations.

 

Bored piles are constructed in the following steps respectively;

 

 

The placing of the reinforcement is implemented using tremie pipes starting from the bottom of the pile to the surface.

 

Typically, the bored pile diameters are drilled by conventional drilling equipments to sizes between 65 cm to 300 cm.

 

The main quality conctrol during construction is provided by vertical and depth dimension control run by specially developed measuring instruments, positioning of reinforcement, concrete volume and after construction continuity (integrity) and load tests (static, dynamic, or Oesterberg cell).

 

WHAT İS BORED PILES ?

Bored pile is another type of reinforced concrete pile which is used to support high building which has heavy vertical load. Bored pile is a cast-in-place concrete pile where the bored piles have to be cast on construction site, while other concrete piles like Spun Pile and Reinforced Concrete Square Pile are precast concrete pile which they’re cast in the factory.

Normally bored piling has be to carried on those tall buildings or massive industrial complexes, which require foundations which can bear the load of thousands of tons, most probably in unstable or difficult soil conditions. Bored piling is cast by using bored piling machine which has specially designed drilling tools, buckets and grabs, it’s used to remove the soil and rock. Normally it can be drilling into 50metres depth of soil. The advantage of bored piling is its’ drilling method, little vibration and lower noise level.

The drilling method is depending on the condition of soil, piling contractor has to do soil investigation and decide which drilling technology has to be carried on. Piling contractor decide the correct drilling technology and minimize disturbance of the surrounding soil. For cohesionless soils such as sands, gravels, silts etc, whether it’s under the water table or not, the pile bore hole must be supported using steel casing or stabilizing muds such as bentonite suspension. After these, reinforcement bar will be put into the bore hole and concrete will be poured into the bore hole.

Bored piling is popular to be used in construction as a foundation especially for bridge work and tall building as well. Bored piling work has to be done by specialist bored piling contractor, normal piling contractor can’t be done without experience and knowledge about bored piles.