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Ductile iron piles



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The driven ductile iron pile is a simple, fast and highly effective pile system. Over the last 30 years over 5 million meters of this pile system has been installed worldwide predominantly in Europe. TRM piles are a pre-fabricated driven pile system utilizing high strength ductile iron pipes which are manufactured using a spun-cast process having outside diameters of 118 and 170 mm. The standard pile lengths are 5,0 m long. The pipes are manufactured with a tapered socket with an internal shoulder for full engagement at top and a tapered spigot at the bottom. The individual pile sections can be connected with this Plug and Drive® connection to drive a pile of any length.

The TRM system’s inherent advantage is the simplicity of the installation process. The piles are driven to refusal or to a required penetration depth with the use of a high-impact high-frequency hydraulic hammer (i.e. Breaker hammer).

In most applications the hydraulic hammer is mounted on an appropriately sized excavator. At the completion of driving the pile, the pile is cut off and the remaining section of pile is fitted with the appropriate driving shoe and serves as the lead section for the next pile.

The remaining pile is then fitted with an appropriate pile cap plate to receive the load from the superstructure. Based on job specific soil conditions, the pile can be installed as an end-bearing (non-externally grouted) pile or a friction (externally grouted) pile. Design loads according EuroCode (EC) up to 1,200 kN are possible for the 118mm diameter piles and around 2,400 kN is possible for the 170mm piles.

Externally grouted or friction piles are installed with an oversized patented conical grout shoe attached to the base of the lead pile section. As the pile is driven, the annulus created between the pile shaft and the soil is filled simultaneously with a sanded grout bonding the pile shaft to the surrounding soil. Grouted friction piles have external grout diameters of 220mm, 270mm, 320mm and 370mm. These friction piles can be used as tension elements with the addition of tension reinforcing within the pile annulus. When considering skin friction piles, STP values should exceed 3 blows for cohesive soils and 4 blows for non-cohesive soils. Advancing piles in cohesive materials with blow counts exceeding 40 blows in cohesive soils and 60 in non-cohesive soils becomes difficult.


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