Long auger bit for foundation construction

The utility model discloses a long spiral drill bit for foundation construction, which comprises a long spiral drill bit body and a spiral ground drilling blade on the long spiral drill bit body, a mounting shaft is arranged above the long spiral drill bit body, and a quick replacement mechanism matched with the long spiral drill bit body is arranged on the mounting shaft. A limiting mechanism is arranged on the long spiral bit body; and the quick replacement mechanism comprises a fixing block fixedly installed at the bottom end of the installation shaft, a rectangular inserting groove is formed in the bottom of the fixing block, a rectangular clamping block is fixedly connected to the top end of the long spiral drill bit body, and the tops of the two sides of the rectangular clamping block are arranged to be inclined faces. The long spiral drill bit is reasonable in design, the long spiral drill bit body can be conveniently and rapidly replaced in a simple push-pull mode, the replacement efficiency is improv