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Suction excavator : ウィキペディア英語版
Suction excavator

A suction excavator or vacuum excavator is a construction vehicle that removes materials from a hole on land, or removes heavy debris on land.
==Description==
A suction excavator produces powerful suction through a wide pipe which is up to or so diameter. The suction inlet air speed may be up to . Its construction is somewhat like a gully emptier but with a wider suction hose and a more powerful suction.
The suction nozzle may have two handles for the operator to hold; those handles may be on a collar which can be rotated to uncover suction-release openings (with grilles over) to release the suction to make the suction nozzle drop anything which it has picked up and is too big to go up the tube.
The end of the tube may be toothed. This helps to cut earth when used for excavating; but when it is used to suck up loose debris and litter, some types of debris items may snag on the teeth. The earth to be sucked out may be loosened first with a compressed-air lance, or a powerful water jet.
Excavating with a suction excavator may called "vacuum excavation", or "hydro excavation" if a water jet is used. Vacuum excavation (also known as suction excavation) is considered a best practice for safely finding and seeing underground utilities, reducing by more than half the chance of damaging buried utilities.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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