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In the following you will find answers to questions that are frequently asked about our products.

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Frequently asked questions – FAQs

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  • TRM driven piles create vibrations. Can they cause damage to surrounding buildings?

    Acceleration values under 2 mm/s occur during the production of the ductile driven pile. These values are completely harmless for buildings which are under protection orders. The technical reason lies with the high-speed hydraulic hammer (550 impacts per minute), which causes minimal liquefaction of the soil in the area immediately surrounding the shaft.

  • How much noise is generated by the TRM driven piles?

    The main source of noise when a pile is driven in is the hydraulic hammer itself; values of over 110 dB have even been measured within a radius of 2 to 3 m. Therefore, it is absolutely essential that each worker wears ear defenders. However, the noise decreases sharply the greater the distance; values of between 80 and 85 dB are generally found within a radius of 20 m. The ""grouted piles"" system using green concrete creates a more pleasant feeling for people in attendance on the site, as well as for neighbors who are affected, of course.

  • How do TRM driven piles cope with horizontal forces?

    Horizontal forces represent a challenge for any low-caliber pile system; the ductile pile resolves this by being inserted at an inclined angle of up to 45°. The bending moments acting upon the pile are converted into longitudinal forces.

  • What are TRM angled piles?

    see horizontal forces

  • What are TRM pile groups?

    Pile groups are manufactured on the basis of general technical rules. An axial distance of three times the diameter of the pile must be complied with.

  • Are TRM ductile piles exposed to corrosion?

    While steel corrodes quickly, ductile cast iron is extremely resistant due to its layer of scales. The corrosion process is slowed down significantly by its higher carbon content. Instead of surface corrosion, ductile cast iron undergoes pitting, which has less of an impact upon static load-bearing capacity than the continuous reduction in the thickness of the wall which surface corrosion entails. Unfortunately, this fact is not taken into account in the Euro Code (EC), and the ductile pile is subjected to a rust rate that depends on how aggressive the soil is. Nevertheless, it offers increased safety for the customer at all times.

  • How do TRM ductile piles cope with vibrations caused by earth tremors?

    Forces exerted by earth tremors, which are primarily treated as tensile forces in the static assessment, are dissipated through the structure's design as a compression and tension pile. (See ""Tensile forces"").

  • How do TRM ductile piles cope with tensile forces?

    Tensile forces are transmitted through the structure's design as a ""tension pile"". The ductile pile becomes a tension pile if there is armoring installed along the entire length of the pile, following completion of the driving process, in the form of an armoring or threaded rod. The tensile force is measured here exclusively over the cross-section of the armoring. In the calculation of the compression force, the additional cross-section can be used, which allows the thickness of the wall of the ductile pile to be reduced.

  • What types of pile load tests can be implemented with TRM ductile piles?

    The ductile pile does not require any special measures in order to conduct pile load tests. Static, dynamic or statnamic (combination of static and dynamic) pile load tests can be selected. Nevertheless, it is important to remember that low-caliber pile systems react sensitively to asymmetric structures. It is advisable to create a pile head that is large enough to absorb horizontal forces. In the case of a dynamic pile load test, bear in mind that there must be an adequately large drop weight (at least 4 tons) to guarantee that the pile actually penetrates the substructure owing to the higher modulus of elasticity (170,000 MPa). If drop weights are too low, this may cause interpretation problems for the PDA (Pile Driving Analyzer).