长螺旋钻孔压灌砼桩施工及质量控制技术.rar

长螺旋钻孔压灌砼桩施工及质量控制技术

摘要： 长螺旋钻孔压灌砼桩采用长螺旋钻机钻孔，至设计深度后提钻，灌砼，下钢筋笼振捣成桩，既成孔、成桩由一机一次完成任务。在长螺旋干钻法基础上发展的压灌砼桩因其不受地下水位的限制，成桩速度快，低噪音，无振动，单桩承载力高，工程造价低，综合效益好，适应性强等优点近几年在全国各地开始广泛使用。同时，该种新桩型施工技术性强，桩基质量受施工因素影响较大。因此，本人根据实习过程中发现的质量问题并参考有关优秀施工单位总结的施工质量控制技术经验，供大家参考。

关键词： 长螺旋钻孔压灌砼桩 施工技术
一、长螺旋钻孔压灌砼桩的质量优点
1、适应性强：该桩型适用于粘性土，粉土，填土等各种土质，能在有缩径的软土、流沙层、沙卵石层、有地下水等复杂地质条件下成桩。
2、桩身质量好：由于混凝土是从钻杆中心压入孔中，混凝土具有密实、无断桩、无缩颈等特点，并对桩孔周围土有
 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