基樁孔污泥處理為何需要空壓機

Question

基樁孔灌漿前污泥處理為何需要空壓機?它的作用在哪裡？謝謝。

Answer 1

這是利用 air lift pump 的原理，將孔底污泥抽出來排掉。

基樁孔底污泥比較重 (所以才會沉在孔底)，鑽掘機上都有污泥抽水機，污泥抽水機連接一大管，大管另一端深入孔底，大管內附一小管，小管管口在大管之底部內部且管口朝上，用空壓機由此一小管打入空氣，使污泥混合空氣，使污泥平均比重降低，容易由大管汲上來排掉。

參考資料(圖片)：(圖片顯示 air lift pump 的原理，不是基樁設備，基樁設備可加裝，)
http://www.engnetglobal.com/tips/glossary.aspx?word=Air Lift Pumps
http://www.frontier.net/~ohare/airliftpumpsmart.gif
http://www.koenderswindmills.com/images/air_lift_pump.jpg


Airlift 是基樁術語 :
Airlift : A pressure method of cleaning loose material out of an open-ended cased pile, caisson or cofferdam cell. Usually compressed air is introduced into the water at the bottom of the casing via a small pipe inside a larger pipe. Air is directed upward out of the larger pipe; this upward flow tends to lift material in the pile.
參考資料：
http://www.apevibro.com/asp/glossary.asp?letter=a
http://www.engnetglobal.com/tips/glossary.aspx?word=Air Lift Pumps
http://en.wikipedia.org/wiki/Airlift_(dredging_device)