«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年04期

页码:

171-178

栏目:

岩土工程

出版日期:

2023-07-10

文章信息/Info

Title:

Research on application of micro-steel pipe pile underpinning piled raft foundation of existing building

文章编号:

1673-2049(2023)04-0171-08

作者:

朱彦鹏^1,2,吕向向^1,2,杨奎斌^1,2,吴林平^1,2,韦正德^1,2,施多邦^1,2

(1. 兰州理工大学 土木工程学院,甘肃 兰州 730050; 2. 兰州理工大学 西部土木工程防灾减灾教育部工程研究中心,甘肃 兰州 730050)

Author(s):

ZHU Yanpeng^1,2, LYU Xiangxiang^1,2, YANG Kuibin^1,2, WU Linping^1,2, WEI Zhengde^1,2, SHI Duobang^1,2

(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

关键词:

已有建筑;  托换技术;  微型钢管桩;  施工监测;  加固效果

Keywords:

existing building;  underpinning technology;  micro-steel pipe pile;  construction monitoring;  reinforcement effect

分类号:

TU929

DOI:

10.19815/j.jace.2021.11114

文献标志码:

A

摘要:

为了研究微型钢管桩托换加固已有桩筏基础建筑的实际应用,以三门峡市某已有桩筏基础建筑物的基础托换工程为例,对已经产生倾斜的16层已有建筑物进行事故原因分析,结合以往实际工程案例经验以及各加固方法优缺点对比,最后采用微型钢管桩托换基础和外扩筏板基础相结合的加固方案。通过单桩竖向承载力计算、稳定性计算以及现场原位试桩,确定微型钢管桩施工工艺以及控制参数,利用现场沉降位移监测,对托换加固方案效果进行评价。结果表明:微型钢管桩托换和外扩筏板基础相结合的加固方案不仅施工工期短,加固机理明确,而且施工期间对建筑物扰动较小,综合加固效果显著; 根据监测数据,测点DX1、DX2和DX7处累计沉降量相对较大,其中测点DX1处最大累计沉降位移为-81.1 mm,测点DX7处最大日均沉降为-1.23 mm; 被加固的已有建筑物在施工完微型钢管桩大约15 d以后,日均沉降位移稳定控制在0～0.05 mm?d^-1之间; 研究成果可为填方区地基不均匀沉降加固设计提供一定的参考。

Abstract:

In order to study the practical application of micro-steel pipe pile underpinning piled raft foundation of existing building, a foundation underpinning project of an existing piled raft foundation building in Sanmenxia city was taken as an example. The cause of the accident of the existing 16-story building that has been inclined was analyzed. Combined with the previous actual engineering case experience and the comparison of the advantages and disadvantages of each reinforcement method, and finally a reinforcement plan combining the underpinning of micro-steel pipe pile underpinning and the externally expanded raft foundation was adopted. Through the calculation of vertical bearing capacity of single pile, stability calculation and field test pile, the construction technology and control parameters of micro-steel pipe pile were determined, and the field settlement monitoring was used to evaluate the effect of the underpinning reinforcement scheme. The results show that the reinforcement scheme combining micro-steel pipe pile underpinning and externally expanded raft foundation not only has short construction period and clear reinforcement mechanism, but also has less disturbance to buildings during construction, and the comprehensive reinforcement effect is remarkable. According to the monitoring data, the cumulative settlement at the measuring points DX1, DX2 and DX7 are relatively large. The maximum cumulative settlement at the measuring point DX1 is -81.1 mm, and the maximum daily settlement at the measuring point DX7 is -1.23 mm. About 15 d after the construction of the micro-steel pipe piles, the average daily settlement of the reinforced existing building is stably controlled between 0 and 0.05 mm?d^-1. The research findings can provide some reference for the reinforcement design of uneven settlement of foundation in filling area.

参考文献/References:

[1] 王新武.钢管微型桩在楼房地基加固和纠偏中的综合应用[J].建筑科学,2008,24(11):99-101,104.
WANG Xinwu.The comprehensive application of micro-steel pipe pile in foundation reinforcement and inclination-rectifying[J].Building Science,2008,24(11):99-101,104.
[2]张小兵,陈广涛,赵文强.微型桩在青海李坎公路K14 km加固路肩挡墙基础中的应用[J].施工技术,2009,38(增1):220-222.
ZHANG Xiaobing,CHEN Guangtao,ZHAO Wenqiang.Application of micro-pile in basis of retaining wall reinforcement in K14 kilometers of Qinghai Li-Kan Road[J].Construction Technology,2009,38(S1):220-222.
[3]吴江斌,王向军,宋青君.锚杆静压桩在低净空条件下既有建筑地基加固中的应用[J].岩土工程学报,2017,39(增2):162-165.
WU Jiangbin,WANG Xiangjun,SONG Qingjun.Application of foundation reinforcement by anchor-jacked piles under low clearance[J].Chinese Journal of Geotechnical Engineering,2017,39(S2):162-165.
[4]徐醒华,付兆明,伍锦湛.锚杆静压桩在建筑物基础加固中的应用[J].建筑结构,2004,34(12):22-23.
XU Xinghua,FU Zhaoming,WU Jinzhan.Application of anchor static pressure pile in building foundation reinforcement[J].Building Structure,2004,34(12):22-23.
[5]张 勇,盛宏光,赵红玲,等.应用钢管微型桩对倾斜楼房进行纠偏加固[J].岩石力学与工程学报,2008,27(增1):3122-3126.
ZHANG Yong,SHENG Hongguang,ZHAO Hongling,et al.Rectification and reinforcement of a tilted building by using micro-steel-piles[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(S1):3122-3126.
[6]李清泉,张小兵,程晓伟.钻孔取土和锚杆静压桩在湿陷性黄土地区建筑物纠倾加固中的应用[J].铁道建筑,2013,53(6):118-121.
LI Qingquan,ZHANG Xiaobing,CHENG Xiaowei.Application of drilling soil and anchor static pressure pile in building inclination rectification and reinforcement in collapsible loess area[J].Railway Engineering,2013,53(6):118-121.
[7]朱彦鹏,王海明,杨奎斌,等.黄土填方地基中微型钢管桩承载性状试验研究[J].岩土工程学报,2018,40(增1):198-204.
ZHU Yanpeng,WANG Haiming,YANG Kuibin,et al.Experimental study on bearing characteristics of micro steel tube piles in loess fill foundation[J].Chinese Journal of Geotechnical Engineering,2018,40(S1):198-204.
[8]江岳春.锚杆静压桩加固高层建筑中不均匀拖带沉降控制的探索与应用[J].建筑结构,2021,51(8):110-114.
JIANG Yuechun.Exploration and application of uneven towing settlement control in high-rise buildings strengthened by anchor static pressure piles[J].Building Structure,2021,51(8):110-114.
[9]CHENG X S,HONG J L,LI D.Simplified Timoshenko method for pile underpinning reinforcement of existing self-bearing brick masonry walls[J].Journal of Building Engineering,2021,35:102062.
[10]建筑变形测量规范:JGJ 8—2016[S].北京:中国建筑工业出版社,2016.
Code for deformation measurement of building and structure:JGJ 8—2016[S].Beijing:China Architecture & Building Press,2016.
[11]石鹏鑫.Q₃黄土竖向压缩-回弹特性试验研究[D].西安:西安理工大学,2020.
SHI Pengxin.Experimental study on the characteristics of vertical compression-resilience of Q₃ loess[D].Xi'an:Xi'an University of Technology,2020.
[12]朱彦鹏,王秀丽.工程事故分析与处理[M].北京:中国建筑工业出版社,2020.
ZHU Yanpeng,WANG Xiuli.Analysis and treatment of engineering accidents[M].Beijing:China Architecture & Building Press,2020.
[13]胡 伟,陈林庆,孙光俊,等.定位静压注浆在既有建筑物地基加固中的应用[J].施工技术,2000,29(9):34-44.
HU Wei,CHEN Linqing,SUN Guangjun,et al.Application of locating static pressure grouting method in strengthening the soil retrofication of existing buildings[J].Construction Technology,2000,29(9):34-44.
[14]邓建红,李文彪.树根桩与静压注浆复合地基在某高速公路既有通道地基加固处理中的应用[J].工程勘察,2008,36(12):9-11,20.
DENG Jianhong,LI Wenbiao.Application of composite foundation in reinforcement treatment for a highway existing culvert[J].Geotechnical Investigation & Surveying,2008,36(12):9-11,20.
[15]姚智全,曹光栩,吴渤昕.微型钢管桩不同施工工艺在既有建筑物地基加固工程中的应用与比较[J].建筑科学,2021,37(7):94-99.
YAO Zhiquan,CAO Guangxu,WU Boxin.Application and comparison of different construction technologies of mini steel pipe piles in foundation reinforcement engineering of existing buildings[J].Building Science,2021,37(7):94-99.
[16]王巍伟,易 达.嵌岩钢管水泥浆组合桩在地基处理中的应用[J].施工技术,2015,44(13):43-46,96.
WANG Weiwei,YI Da.Application of rock-socketed steel pipe cement combination pile in foundation treatment[J].Construction Technology,2015,44(13):43-46,96.
[17]龚晓南,陶燕丽.地基处理[M].2版.北京:中国建筑工业出版社,2017.
GONG Xiaonan,TAO Yanli.Ground treatment[M].2nd ed.Beijing:China Architecture & Building Press,2017.
[18]载体桩技术标准:JGJ/T 135—2018[S].北京:中国建筑工业出版社,2018.
Technical standard for piles with ram-compacted bearing sphere:JGJ/T 135—2018[S].Beijing:China Architecture & Building Press,2018.
[19]建筑桩基技术规范:JGJ 94—2008[S].北京:中国建筑工业出版社,2008.
Technical code for building pile foundations:JGJ 94—2008[S].Beijing:China Architecture & Building Press,2008.
[20]朱彦鹏,严紫豪,朱轶凡.微型钢管砂浆复合桩在土体中稳定性计算[J].岩土力学,2020,41(4):1339-1346.
ZHU Yanpeng,YAN Zihao,ZHU Yifan.Stability calculation of micro steel tube mortar composite pile in soil[J].Rock and Soil Mechanics,2020,41(4):1339-1346.
[21]锚杆静压桩技术规程:YBJ 227—91[S].北京:冶金工业出版社,1991.
Technical specification for anchor static pressure pile:YBJ 227—91[S].Beijing:Metallurgical Industry Press,1991.

相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-11-15
基金项目:教育部长江学者创新团队支持计划项目(IRT_17R51)
作者简介:朱彦鹏(1960-),男,教授,博士生导师,E-mail:zhuyp@lut.cn。

常用功能

更新日期/Last Update: 2023-07-01