Bored pile installation

Advantages and Features of the Technology

1. High productivity;

2. High-quality filling of the borehole with concrete, as the concrete is supplied under pressure;

3. Low noise level;

4. Ability to construct piles through dense sand layers;

5. Installation of the reinforcement cage.

The construction of bored piles using the Continuous Flight Auger method (CFA) has become widely used in foundation engineering due to its high productivity, load-bearing capacity, technological efficiency, and reliability. This method is particularly effective at sites with irregular soil stratification, including alternating layers of sand and clay.

Under the CFA method, piles are constructed using a continuous hollow-stem auger. Once the auger string reaches the design depth, concrete is pumped through the internal pipe of the auger while the auger string is simultaneously withdrawn from the borehole. After the borehole has been filled with concrete, the reinforcement cage specified by the project is installed using a vibratory driver.

Advantages and Features of the Technology

1. High productivity and high load-bearing capacity.

2. High-quality filling of the borehole with concrete.

3. High accuracy in pile positioning and maintenance of vertical alignment.

4. Ability to construct piles through dense sand layers.

5. No slurry or excavated soil at the construction site.

This technology involves forming a borehole using a special drilling tool that compacts and displaces the soil while advancing to the design depth. Concrete is pumped through an opening in the drilling tool using a concrete pump. The reinforcement cage is then installed into the borehole to the specified design depth using a vibrator.

Advantages and Features of the Technology

1. No dynamic or vibration impact on the soil.

2. Allows boulders encountered at depth to be drilled through or extracted.

3. The borehole is filled through a tremie pipe while the reinforcement cage is already installed. When the required procedure is followed, this prevents the formation of narrowed sections in the pile.

4. During drilling, the actual engineering and geological conditions are directly checked for compliance with the design conditions.

This technology makes it possible to construct individual piles, pile groups, and diaphragm wall structures made of contiguous and secant bored piles. The method is widely used when working close to existing buildings and structures.

Advantages and Features of the Technology

1. Maintaining high directional accuracy.

2. Controlled removal of soil.

3. Low vibration.

4. Compact equipment dimensions.

5. Drilling with casing or using CFA technology.

The use of micropiles makes it possible to strengthen the foundations of existing buildings in extremely confined conditions. Work can also be carried out from basements or microtunnels in any direction.

Micropiles are successfully used to strengthen the foundations of historic buildings during restoration or reinforcement, as well as in connection with deep excavation works, the construction of underground structures, and similar projects. Only a small working area is required for micropile installation, so such piles can be constructed in confined conditions. Work can also be performed in any direction. In terms of technology, micropile drilling does not differ significantly from conventional drilling. The most notable difference between micropiles and bored piles lies in the method of delivering the injection concrete mixture to the bottom of the borehole. The technology is adapted depending on the soil characteristics and the proximity of groundwater.