Soldier Pile Shoring

The Imeco Wall Lining System consists of wide flange I-beams (H-piles), steel shoring plates of various length and height as well as heavy duty trench struts or bracings.



Installation:

The piles can be driven into the soil on both sides of the trench by any hydraulic vibrator or impact hammer of sufficient size and power but we recommend to use our hydraulic Mobilram piling rig for driving and extracting the piles with unmatched performance as well as exact pile verticality. To make sure that the piles are in the correct logitudinal distance we provide pile-distance guides for different plate lengths. A continous flight auger may be used to bore holes in which the piles are inserted if the ground is hard or if vibrating or hammering is not allowed. Depending on the trench depth the piles (beams) may be suppllied with a second vertical guide so that the plates can be moved parallel to each other (step trench). The pile length and the section modulus has to be designed to meet the actual site conditions.

When the piles are in place the excavator makes a first cut of 1.0-1.5 m depth (depending on the ground condition) and installs two shoring plates in between the piles on both sides of the trench. We supply plates in lengths from 3000-6000 mm but 3500 and 4000 mm are most common. The plates are sunken down to the required depth by the excavator using the lower-and-cut method (similar to sinking of well rings) i.e. the backhoe excavates along the plates and pushes them down with the full bucket. A cutting edge at the plate bottom makes this an easy operation. If the height of one base plate bucket of 2400 mm is not sufficient an extension plate with 1300 mm height can be added to reach 3900 mm depth. We strongly recommand to handle the plates during installtion and extraction with the hydraulic excavator as cranes are too slow for this kind of fast operation. For depths of more than 4000 mm we supply bearing piles with two guides so that two parallel rows of shoring plates may be used to protect trenches up to 9000 mm depth.

Depending on pile section, excavation depth and soil condition one or more layers of heavy duty trench struts (bracings) are placed between the piles to support the plates and the soil pressure. For shallow trenches no struts at all are needed which provides and unrestricted room for maximum pipelaying progress. The struts are fixed to the piles by a special cardanic jaws which guarantees optimum load transfer and are hooked-back by two steel chains for optimum workers safety.



Advantages:

  • Excellent installation progress
  • Only one excavator and two men are needed for shoring and excavating (besides the piling group)
  • Useable in all soil conditions, even in hard soil when sheet piles can not be driven
  • Provides maximum clearance below bottom strut for laying large diameter pipes
  • Can be installed in sensitive areas without vibrating or hammering
  • For extra long pipes (up to 12 m) special beams and hydraulic jack are provided for removing the bracings at one pile pair which creates an open space of 12.50 m for very fast pipe laying