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Flood Grouting

This concept, which was pioneered in Hungary in the 1960s, relies on the basic principle of a chemical reaction to produce a gel, which binds the pipe and surrounding soil particles to form a weak concrete which stabilises the ground and seals defects in the pipe. The system can isolate and seal an entire local sewer network, including the main pipe, laterals and manholes in one operation.
The main application of the system is to seal leaks and infiltration in sewers systems. It is relatively simple to use but due to the volumes of solutions required, only small diameter pipelines should be renovated in this manner. The process will only work where the surrounding soil is porous and granular.
Technology Description
The first solution, S1, is pumped from a tanker into the sewerage system and under hydraulic pressure migrates through the various defects, saturating the backfill. After an hour or so, the solution level in the control manhole will have stabilised and the surplus S1 is pumped from the downstream manhole into the tanker for cleaning and recycling. The second solution, S2, is then immediately pumped into the system under the same hydrostatic head. The solutions react forming the gel, which after 30 minutes becomes non-porous forming a watertight, concrete like structure around the pipe.
A significant advantage of this system is that manholes and lateral connection defects are sealed as well as the main sewer.


Flood Grouting

Last Updated on Thursday, 20 November 2014 12:18

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