長螺旋鉆孔壓灌砼樁施工及質量控制技術.rar

長螺旋鉆孔壓灌砼樁施工及質量控制技術

摘要： 長螺旋鉆孔壓灌砼樁采用長螺旋鉆機鉆孔，至設計深度后提鉆，灌砼，下鋼筋籠振搗成樁，既成孔、成樁由一機一次完成任務。在長螺旋干鉆法基礎上發展的壓灌砼樁因其不受地下水位的限制，成樁速度快，低噪音，無振動，單樁承載力高，工程造價低，綜合效益好，適應性強等優點近幾年在全國各地開始廣泛使用。同時，該種新樁型施工技術性強，樁基質量受施工因素影響較大。因此，本人根據實習過程中發現的質量問題并參考有關優秀施工單位總結的施工質量控制技術經驗，供大家參考。

關鍵詞： 長螺旋鉆孔壓灌砼樁 施工技術
一、長螺旋鉆孔壓灌砼樁的質量優點
1、適應性強：該樁型適用于粘性土，粉土，填土等各種土質，能在有縮徑的軟土、流沙層、沙卵石層、有地下水等復雜地質條件下成樁。
2、樁身質量好：由于混凝土是從鉆桿中心壓入孔中，混凝土具有密實、無斷樁、無縮頸等特點，并對樁孔周圍土有
 Long bored piles and concrete grouting quality control

Abstract: The long screw drilling pressure grouting concrete pile with a long auger drilling, designed to provide depth after the drilling, irrigation concrete, vibrated into a pile of reinforced cage, All that hole, into a pile by a machine to complete the task. In the long spiral stem drilling method developed on the basis of pressure grouting concrete piles because of their free water restriction, into the pile speed, low noise, no vibration, high bearing capacity, low cost and good overall efficiency, adaptability In recent years, advantages such as wider use across the country began. Meanwhile, the kind of highly technical construction of the new pile, pile foundation construction influenced by the larger. Therefore, I practice the process according to the quality found in reference to the excellent summary of the construction unit construction quality control experience, for your reference.

Key words: long screw drilling pressure grouting Concrete Piles
A long screw drilling pressure grouting concrete pile quality advantages
1, strong adaptability: the pile suitable for clay, silt, soil and other fill, there are necking in the soft soil, sand layers, sand gravel layer, a groundwater into a pile under complicated geological conditions.
2, pile of good quality: the concrete is the center of pressure from the drill pipe into the hole, concrete is dense, no broken pile, no necking and so on, and there are piles of soil around the hole
 

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