2015年7月上第44卷第13期
D01:10.7672/sgjs2015130023
施工技术
CONSTRUCTION TECHNOLOGY
填石层超深预应力管桩综合施工技术
宋明智，尚增弟，于芳，雷斌，叶绅
（1.深圳市工勘岩土工程有限公司，广东深圳518026；2.深圳市市政工程总公司，广东深圳518026）【摘要】在超过10m以上的深厚填石层施工大直径超深预应力管桩，通常先采用冲击钻进引孔，穿越填石层后回填砂土再施工管桩，存在填石层冲击引孔时间长、易孔、护壁泥浆量大、综合费用高等弊端。在上部填石层采用大直径潜孔锤引孔以穿越填石层，使用筒型钢桩尖以提高桩管的穿透力和垂直度，设置专门的双向泄水孔以克服地
下水浮力，达到了引孔速度快、锤击穿透效果佳、施工费用低的效果。【关键调】地下工程；桩基础；预应力管桩；填石层；施工技术
【中图分类号】TU753.3
【文献标识码】A
[文章编号】1002-8498（2015)13-0023-03
ComprehensiveConstructionTechnologyofUltra-deep
PHCPileinthe StoneFilledLayer
Song Mingzhi, Shang Zengdi, Yu Fang, Lei Bin,Ye Shen
(1. Shenzhen Gongkan Geotechnical Engineering Co. , Lad. , Shenzhen, Guangdong 518026, China;
2. Shenzhen Municipal Engineering Corporation,Shenzhen, Guangdong 518026, China)
Abstract:PHC pile construction with 800mm diameter and over 50 meters depth in more than 10 meters deep stone filled layer, it's usually using traditional construction technology of impact holing. Impact holing method is adopted to pass through the stone fill layer, then backfill sand and construct PHC pile. There are several disadvantages in the previously mentioned method such as spending much time in impact holing, easily causing hole collapse, a great quantity of mud for hole protecting and high cost. In this paper, the authors suggest a new construction technology that using the large diameter DTH hammer to pass through the stone fll layer, and then use long cone steel pile tip to pipe the PHC pile for its high penetration and the perpendicularity of PHC pile can be guaranteed. Besides, there is especially designed two-way drainage hole on the pile to overcome the buoyancy of groundwater. This comprehensive construction technology has the advantages of drilling hole faster, being good at penetrating the stone fill layer and lower cost.
Key words;underground; piles; PHC piles; stone filled layer; construction
引言 0
在超过10m以上的深厚填石层（填石粒径 300~2000mm）施工大直径（$800mm）、超深（50m 左右)预应力混凝土管桩，通常的施工工艺是先采用冲击钻进引孔，穿越填石层后回填砂土再进行管桩施工。这种工法存在填石层冲击破岩困难、易斜孔、易跨孔、护壁泥浆量大、引孔时间长、综合费用高等弊端。本综合施工技术拟在上部填石层采用大直径潜孔锤复合引孔穿越，使用简型钢桩尖以提
【作者简介】宋明智，高级工程师，工程部副经理，E-mail：719782267@qq.c
【收稿日期】2014-07-26 万方数据
23
高桩管的穿透力和垂直度，在管桩端部设置专门的双向泄水孔以克服桩侧应力，实际施工达到了引孔速度快、管桩施工穿透能力强、施工费用低的综合效果。
本文就深厚填石层的大直径、超深预应力混凝土管桩施工工艺进行了探讨，取得的显著效果拓宽了预应力管桩的使用范围，具有一定的借鉴意义和
推广价值。工程概况 1
珠海港高栏港务多用途码头二期工程位于珠海市高栏港区南水作业区，项目场地为开山填筑堆填后形成。港区建(构)筑物为大跨度钢结构设计，