摘要
砂卵石场地的钻孔灌注桩通常采用泥浆护壁旋挖或反循环成孔工艺,该类成孔工艺泥浆用量大、质量控制要求高,易产生塌孔、沉渣超标等质量问题,导致单桩承载力不能满足设计要求。长螺旋钻孔压灌桩工艺无泥皮和沉渣,成桩质量和单桩承载力大幅提升,但对于超长桩,该工艺不能下通长钢筋笼,一定程度上限制了该工艺的使用。结合西安奥体中心工程进行试验研究与论证,将通长配筋改为按桩长2/3且不大于25m配筋,保证了长螺旋钻孔压灌桩在该项目的使用。
The commonly used technology of bored piles in sand and pebble fields is mud protection wall rotary excavation or reverse circulation drilling technology.This type of drilling technology requires a large amount of mud and high-quality control,which is prone to quality problems such as collapse and excessive sludge,resulting in single pile bearing capacity not meeting the design requirements.The long spiral drilling and pressure grouting pile technology have no slurry cake and sediment,greatly improving the quality of the pile and the bearing capacity of a single pile.However,for ultra-long piles,the full-length steel cage cannot be used in this progress,which to some extent limits the use of this technology.Based on the experimental research of the Xi'an Olympic Sports Center project,the reinforcement of the entire length was changed to 2/3 of the pile length and not exceeding 25 meters,guaranteeing the use of this method in the project.
作者
党智荣
李有建
党静茂
刘平
樊明明
Dang Zhirong;Li Youjian;Dang Jingmao;Liu Ping;Fan Mingming(China Jikan Institute Of Eingineering Investigation&Design Co.,Ltd.,Xi'an 710021,Shaanxi,China;Northwest Company of China Construction Eighth Engineering Bureau,Xi'an 710077,Shaanxi,China)
出处
《岩土工程技术》
2024年第4期499-504,共6页
Geotechnical Engineering Technique
关键词
砂卵石场地
泥浆护壁
旋挖钻机成孔
反循环钻机成孔
长螺旋压灌桩
pebble field
mud wall protection
rotary excavation
reverse circulation drilling
long spiral pressure grouting pile
