Good still shot of an extended concrete truck arm.
https://s3-us-west-1.amazonaws.com/h...m_unfolded.jpg
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Good still shot of an extended concrete truck arm.
https://s3-us-west-1.amazonaws.com/h...m_unfolded.jpg
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
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.