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    屈建民
    （北京市衛(wèi)建設(shè)計(jì)所  100054）

[提要]  結(jié)合一個(gè)原設(shè)計(jì)是錘擊預(yù)制樁基礎(chǔ)后改為大直徑人工挖孔擴(kuò)底樁基礎(chǔ)的工程，總結(jié)變更設(shè)計(jì)的成功之處，并對(duì)如何合理應(yīng)用大直徑人工挖孔擴(kuò)底樁基礎(chǔ)提高經(jīng)濟(jì)效益進(jìn)行了探討。
[關(guān)鍵詞]  挖孔擴(kuò)底樁 經(jīng)濟(jì)效益

Compared to primary design of precast pile, a new design is applied in the large diameter pile with bulb shaped size, wluch reduced the cost of the foundation by one third and improving the economic and social profits greatly. The suitable condition and the practical application of large diameter pile with bulb shaped bases are profoundly discussed.
Keywords:  pile with bulb shaped bases;profit