When the pile is dug, the slag is not lifted, the movable wooden door at the work area is closed, the personnel can not be threatened by the falling of stones and debris at the wellhead;

挖桩时，不提渣，工作区活动木门关闭，无需担心受到井口石块、杂物掉落的威胁；

youdao

When the pile is dug, the slag is not lifted, the movable wooden door at the work area is closed, the personnel can not be threatened by the falling of stones and debris at the wellhead;

挖桩时，不提渣，工作区活动木门关闭，无需担心受到井口石块、杂物掉落的威胁；

youdao