CIFA concrete pump truck- GIF

[Jon]

Good still shot of an extended concrete truck arm.

[Ralphxyz]

With the tubes full of concrete that must be a heavy static load for the hydraulics to move and hold in the air like that.

Ralph

[Unkle Fuzzy]

The last bit of material when the pour is done is swung over to a clean out area, then a rubber pig is inserted into the line and water pushed up the line behind the pig to squeegee the cement out of the pipes.

Some operators pump a bentonite clay slurry through the pipes before the pour to line the pipes and reduce wear. This coating also assists with cleanout.