[1]贾强1,2,张鑫1,等.济南商埠区历史建筑地下增层工程设计与施工[J].山东建筑大学学报,2014,(05):464-469.
 Jia Qiang,Zhang Xin,et al.Project design of adding basement of existing buildings by steel tubular pile underpinning technology[J].Journal of Shandong jianzhu university,2014,(05):464-469.
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济南商埠区历史建筑地下增层工程设计与施工
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《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2014年05期
页码:
464-469
栏目:
工程实践
出版日期:
2014-10-15

文章信息/Info

Title:
Project design of adding basement of existing buildings by steel tubular pile underpinning technology
作者:
贾强张鑫夏风敏谭天乐王继国
(1.山东建筑大学土木工程学院,山东济南250013;2.山东省建筑结构鉴定加固与改造重点实验室,山东济南250013)
Author(s):
Jia Qiang 1 2 Zhang Xin 1 2 Xia Fengmin 1 2 et al.
1. School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China; 2. Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures, Shandong Jianzhu University, Jinan 250013, China
关键词:
关键词:地下增层微型钢管桩托换
Keywords:
adding basement steel tubular pile underpinning
分类号:
TU 470
文献标志码:
A
摘要:
摘要:利用微型钢管桩托换支撑既有建筑,下方开挖土方施工地下室是一种既有建筑地下增层的有效方法。但随着钢管四周土方的开挖,钢管稳定性会降低。文章对位于济南商埠区的济南某医院地下增层工程进行了设计,并对钢管稳定性的保证措施进行了研究。结果表明:每向下开挖一定深度需在钢管间设置拉结支撑杆件,钢管两侧挖土的高差应控制在1.5m之内,以减少钢管承担的土压力;钢管桩插入钻孔后,需要在孔壁与钢管间高压注浆,形成对钢管的约束和嵌固;钢管的计算长度系数应根据桩顶的约束情况、桩身露出地面的自由长度、桩的入土长度、桩侧和桩底的土质等条件综合确定;钢管受压稳定性系数为0.814,压应力为46.4N/mm2,远小于强度设计值215N/mm2。
Abstract:
Steel tubular pile underpinning technology is an effective method to develop underground space in retrofitting existing buildings. The stability of the pile under compressed load decreased after the soil around the pile dug. In this paper, the adding basement of Jinan Skin Disease Hospital in commercial port was designed and the stability of the steel tubular piles was studied. The measures of keeping the stability of piles include: installing structural connect components among the piles after certain depth soil dug, limiting the surmount of soil in 1. 5m beside the piles to decrease the soil pressure on the pile, casting cement paste into the gap between the tube and soil after steel tube is inserted in the drill hole. The effective length factor for stability calculation should be based on restricted ability of the pile top edge, free length, pile depth in soil, side and base resistance of pile.The effective length factor for pile stability calculation is 0. 814. The compressive stress of pile is 46.4 N/ mm 2 , less than the design stress of 215 N/ mm 2 .
更新日期/Last Update: 2014-11-08