FUNDEX piles

Fundex piles with the length up to 34 m and shaft diameter of 380,450 & 520 mm are made directly in soil foundations by absolutely non-dynamic method using original rotating and pressing (extracting) rigs of IHC FUNDEX Equipment (The Netherlands), producing up to 20 piles per day by one machine.

The heel of the pile is the «lost» (left then in soil) cast iron screw point, which is put in the certain place of the soil surface of the foundation. With the help of bayonet joint through triple hydro-isolated soft laying the lower end of the thick drilling tube is fastened to the point. The upper end of it is fixed in the power working part of the drilling table, moving along the directing jib.

The bore-hole for the future pile is created by rotating and pressing submergence of the system «point-drilling tube» up to the project given mark of the pile heel. During the penetration of the system into the foundation the soil is moved in a radial direction from the well axis and is simultaneously consolidated. This provides more close contact of the stacked concrete with the cylinder soil surface of the bore-hole. Spare air remains inside the tube. When the drill-point reaches the project given mark the cavity is checked on water absence in it.

The prepared reinforcing cage is put in the dry cavity through the open end of the drill tube. Then portion filling with plastic concrete on fine (5-20 mm) filler with tumulus draft is made while stacking 12-14 cm.

The drill tube extraction out of the soil of foundation is made by means of oscilating – back rotation of the tube with its simultaneous application of constant pulling axis force.

As a result of this production cycle, the iron concrete monolithic pile, ready for perception of the bearing capacity after concrete gains enough strength, remains in the soil foundation of the future structure.

Advantages of FUNDEX piles: 

  • refusal to use fabricated piles and following operations concerned (delivery, storage, lifting on the rig, joining etc;
  • full absence of dynamic force on the soil foundation, no vibration while producing piles, which is very important from the point of view of safety of adjoining buildings, especially in narrow construction conditions;
  • conservation of nature composition of soils without weakening their physical-mechanical qualities.
  • good pile bearing capacity on the soil, higher than of the auger pile. This is achieved mainly by   compression (consolidation) of the surrounding soil while the pile is made;
  • no works on removing of the soil from the tube cavity, no necessity of transporting it out of the building site;
  • high efficiency of pile making works;
  • operational control of technological operations while piling works;
  • low noise coming from the special drilling rig (<80 dBa).

Evidently other companies are copying FUNDEX technique, having weighty role in pile foundations arrangement in St.Petersburg.

During 8 years our company has produced more than 26 000 FUNDEX piles, more than 498 000 running meters of piles in the most difficult geo-engineering conditions of St.Petersburg.