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HEK tube pile

The HEK tube pile is a 100% soil displacement screw pile with permanent steel casing, which is applied vibration-free. The HEK tube pile is ideal for use in very soft soil layers where vibration and noise nuisance are unacceptable.

The HEK tube pile system consists of a steel casing outfitted with a screw tip. A hydraulic drilling motor screws it to its desired depth, optionally in combination with an axial pressure force (pull-down). During the screwing, the HEK tube pile acts against soil relaxation and prevents mixing of the soil layers. This makes this pile system also very suitable for sites with contaminated soil.

With the HEK tube pile inclinations up to 1:1 are possible and when the working height is limited the HEK tube pile can be manufactured by adding the casing in parts. It is possible to screw the HEK tube pile below the working level and to fill it later. 

In order to penetrate sand layers with a high cone resistance, they can be drilled using grout injection. The grout film around the drill pipe and the screw tip temporarily lowers the friction and drilling resistance during drilling. Through grout injection, a mixed-in-place mortar shell the size of the screw point is inserted into the bearing sand layer. As a result of this increase in diameter, the tensile and load-bearing capacity of the pile will increase.

The HEK tube pile is installed at the calculated pile tip level. By recording the torque, axial pressing force and drilling time, information about the soil becomes available, enabling the determination of the minimum pile tip level. As a rule, we use concrete with the qualities C20/25 and C28/35 for the HEK tube pile. The head of the pile can be reinforced or the pile can be reinforced over its full length.

For the execution, the minimum permissible center-to-center distance is approximately two times the diameter of the screw tip. The minimum distance between abutment and pile (for the execution) is approximately 0.50 meters (1.6 feet), but depending on the required machine it can be greater. Depending on the soil, pile lengths can go up to more than 40 meters (131 feet).

HEK tube pile click to enlarge

The following specifications are standard. In consultation different diameters are possible.

Shaft diameter Tip diameter
168 mm 290 mm
219 mm 370 mm
273 mm 470 mm
324 mm 560 mm
356 mm 560 mm
385 mm 560 mm
406 mm 560 mm
456 mm 670 mm
508mm 670 mm
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