無靴端夯擴(kuò)灌注樁（簡稱夯擴(kuò)樁）是一種采用錘擊方式將樁端現(xiàn)澆混凝土夯擴(kuò)成大頭形的灌注樁，由浙江省機(jī)械施工公司與杭州市城建設(shè)計院等單位于1979年共同研試成功，它與國外已獲專利的“法蘭克樁”和“阿爾法樁”同屬樁端夯擴(kuò)型灌注樁。該類樁除具有技術(shù)可靠、工藝科學(xué)、施工周期短、無泥漿和工程造價低等優(yōu)點(diǎn)外，對同直徑的灌注樁而言，單樁承載力有較大幅度提高。

1特點(diǎn)
    1.l由于樁端通過夯擴(kuò)形成大頭，且可根據(jù)不同設(shè)計要求進(jìn)行多次夯擴(kuò)或多節(jié)夯擴(kuò)，增大了樁端或樁身局部截面積，提高了單樁垂直承載力（RK）。
    1.2采用同樁身同標(biāo)號的干混凝土作土塞，成功地解決了施工中孔底止淤的關(guān)鍵質(zhì)量問題，減少了樁的沉降，同時撥管成樁時，樁身混凝土是利用柴油錘和內(nèi)夯管的自重壓密成形，保證了樁身質(zhì)量。
    1.3由于夯擴(kuò)樁是采用打入并夯擴(kuò)成樁，故對樁周及樁端地基土有明顯擠密作用，從而提高了地基土強(qiáng)度，對地基處理有一定復(fù)合作用，同時對防止砂土地震液化有一定效果。
    1.4對設(shè)計要求的適應(yīng)性強(qiáng)，可根據(jù)地基土的分布條件與性質(zhì)來選擇樁長和調(diào)整夯擴(kuò)參數(shù)，以滿足設(shè)計所需的承載力。
    1.5夯擴(kuò)樁施工簡便，周期短，施工中不存在泥漿處理等問題，降低工程造價，具有明顯的經(jīng)濟(jì)效益。
No boots side rammer piles (referred to as compaction pile) is a way by hammering situ concrete pile rammed into a bulk form of the pile, by the mechanical construction company in Zhejiang Province and Hangzhou Urban Construction Design Institute in joint research and testing in 1979 success, it has been patented abroad, "Frank piles" and "Alpha pile" belong to the same type pile rammed pile. In addition to a technical reliability of such piles, process science, short construction period, no mud and engineering and low cost advantages, in terms of the same diameter piles, pile capacity has improved substantially.

1 Features
    1.l as pile rammed through the formation of the bulk, and can be repeated for different design requirements or section rammed rammed, increases the pile or pile partial cross-sectional area, increases the vertical bearing capacity of single pile (RK ).
    1.2 using the same pile with the label of the dry soil plug of concrete for the successful solution of the construction of the key hole quality of the end of silt, reducing the pile settlement, while allocating pipe pile, the pile of concrete and in the use of diesel hammer Undercutting the weight of secret self-forming, to ensure the pile quality.
    1.3 As the pile is the use of rammed and rammed into the pile, so on the pile and pile soil compaction significant role, thereby increasing soil strength, on the ground dealing with the role of a certain compound, at the same time to prevent the sand liquefaction have a certain effect.
    1.4 adaptable design requirements, the distribution according to soil conditions and the nature of selection and adjust long tamping expansion pile parameters, in order to meet the design requirements of the bearing capacity.
    1.5 Compaction Column Construction is simple, short period, the construction does not exist in the mud disposal problems, reduce the project cost, with obvious economic benefits.

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