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The RPUM method includes execution phases involving the installation of, either suitable reinforcing steel pipes, or of consolidated columns using the JET GROUTING system, reinforced by a steel pipe.
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Using reinforcing pipes, the method consists in the installation of manchette- type steel pipes acting as reinforcement support for the next installation of the steel ribs. At the same time, they are also used as grouting pipes thus forming a continuous canopy of consolidated soil.
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| Grouted Reinforcement steel pile |
1. DRILLING PHASE: The drilling can be performed either by rotation or rotopercussion iJUBEX-ODEX-like).
In the first case, the drilling string itself, fitted with a drag bit at its end, is left in place; while using the roto-percussion, is the casing that has to be left in place.
In both cases, the drilling string or the casing, acting as reinforcing steel of the consolidation treatment, are fitted with special non-return valves , which are built within the wall thickness of the steel pipes and are such as not to suffer damages during the penetration of the soil.
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| Grouted Reinforcement steel pile |
2. GROUTING PHASE: basically there are two possible grouting techniques:
a. The single valve injection technique, using a double packer placed across to each valve securing each individual valve is pressurization.
b. The one shot technique for each individual fore pile by using a packer placed at the top of the pipe.
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