Friction reducers for concrete tubes to reduce the thrust force for micro tunnel boring machines.
Application fields
Description
To reduce the thrust force for micro tunnel boring machines, it is also possible to use bentonite with viscous polymer and lubricant additives to fill the annular gap: TFA 34.
This preparation gives much better sliding and considerably reduces the friction between the ground and extrados surface of the machine. The reduction of thrust force on the prefabricated concrete rings is ensured by the use of diluted TFA 34.
