FOAMS AND POLYMERS
In order to make the progress of the TBMs easier and faster Cormix has developed a range of injection foams and polymers for injection at the tunnel face modifying the grounds properties including , permeability , plasticity , workability and texture in addition to reducing friction and abrasion at the cutter head .
Ground conditioning is dependent on the specific geological conditions and the equipment used FOAMS
The use of soil conditioning foams can allow EPD TBMs to achieve better advance rates , reduce torque with less wear and tear on the machine even in poor ground conditions. Cormix has various grades of foam to meet all exacting conditions .
CORMIX SCF : Foaming agent for soil conditioning with shielded tunnel boring machines.
CORMIX SCF 1 : Foaming agent for ground with high to low permeability incorporating a polymer for higher efficiency use in sandy, clay, silts.
CORMIX SCF 2 : Foaming agent with polymer for use in sand, clay and silts.
CORMIX SCF 3 : Foaming agent with polymer use in sand and gravels.
Type of soils and products to use
SCHEMATIC DIAGRAM : APPLICATION RANGE – EPB SHIELD
Compairson of Soil Conditioning when used Foam & Polymers
Cormix polymers are used in conditions where water increases and foam alone is not enough . Used in ground conditions containing fine sand,silts or clay and gravels in conjunction with Cormix SCF foams
Cotmix polymers for TBMs excavation are formulated for the following properties :
- Drying out ground conditions
- Reducing segregation in the TBM mixing chamber
- Reduction in stickiness and adhesion to metal surfaces