It was already risky enough to go there alone with a van not well equipped for sand.

In the truck moving step, after the materials are unloaded by the concrete mixing truck (500), the concrete mixing truck (500) is moved away.

An improved drum for a lorry-based concrete mixer is described.

Disclosed is an operation method of matching a concrete mixing truck (500) with a concrete pumping device (400), comprising an unloading step and a truck moving step.