SECTIONAL DRIVEN HIGH-STRENGTH CONCRETE PILE

The sectional driven high-strength concrete pile is built up of sections of high-strength concrete (C45/55 or C60/75). These sections are joined together by means of a steel tube. The steel tube is pressed onto the concrete pile sections by using a special clamping device which results in a clamped splice.

The pile can be driven by means of a small electrically driven pile-driving rig with a drop hammer. A special elastic driving cap has been developed for this pile-driving system which together with the high-strength concrete used in the pile ensure the best alignment between the pile hammer and the pile. As a result a fairly light pile hammer can be used to give an optimal effect. This technique makes it possible to drive the piles deep into the bearing stratum so that a large bearing capacity can be attained.

A special small pile-driving rig has been developed for this pile- driving system. Due to the fact that the dimensions of both the pile-driving rig and the pile section are small, this system is suitable to be used in situations in which the working space is confined, or the working height or the access width is limited.



APPLICATIONS OF SECTIONAL DRIVEN HIGH-STRENGTH CONCRETE PILES:
  • when the working height is limited, for example in existing buildings;
  • in places which are difficult to reach, for example through a narrow alley;
  • in areas where loud vibrations from pile-driving are not permitted;
  • where work has to be carried out at low vibration levels.



TECHNICAL INFORMATION ON SECTIONAL DRIVEN PILES:

  • Diameter of concrete pile sections: 280 mm, 310 mm;
  • Length of pile: depending on the depth of the bearing stratum; a length of 30 m has already been used;
  • Strength of concrete: C45/55 or C60/75;
  • Reinforcement: minimum 88 mm, FeB 500;
  • Allowable shaft bearing capacity 1500 kN; the splice between the sections can resist the same bending moment as the sections themselves; the sectional driven high-strength concrete pile is not used as a tension pile;
  • Maximum rake: 6:1;
  • The pile is built up of sections which are 2 m or 3 m long;
  • Weight of drop hammer: 1000 kg to 2500 kg, depending on the dimensions of the pile and type of soil;
  • Minimum working height: from approx. 4.65 m, depending on the dimensions of the pile and the required type of pile-driving rig;
  • Minimum access width: 1.25 m, depending on the dimensions of the pile and the required type of pile- driving rig;
  • Minimum access height: 1.8 m, depending on the dimensions of the pile and the required type of pile-driving rig;
  • Minimum distance from centre of pile to a wall: 400 mm or more, depending on dimensions of the pile, the required type of machine and the working space available;
  • Monitoring and testing: recording the set of the pile per number of blows; an acoustic reaction test can be carried out on the pile.


Subject to alteration

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