(1 河海大学岩土工程科学研究所, 南京 210098; 2 江苏华岩建设有限公司, 苏州 215101)

摘要: 预应力钢桁架作为支护桩尚未在深基坑工程中得到应用. 通过分析支护桩受力形态得到其优化线路. 以新型预应力钢桁架作为支护桩在实际工程中的应用为例,详细介绍了新型桁架桩的规格尺寸、预应力施加方法、内填水泥浆液的施工方法、桩插入施工的过程等;并以预制预应力混凝土工字桩作为参照组,通过对两者的实测的桩顶水平位移、桩顶沉降、深层水平位移及基坑南侧管线及道路沉降等进行对比,验证新型桁架桩的可行性. 结果表明:采用新型桁架桩与工字桩时,两种支护结构桩顶沉降及桩顶水平位移差异不大;基坑开挖面以下桁架桩刚度沿深度减小,这会导致桩体深层最大水平位移的位置的显著下移;基坑南侧管线及道路沉降可满足设计要求.

关键词: 深基坑; 支护桩; 预应力钢桁架; 工字桩; 水平位移; 沉降; 实测数据分析

中图分类号:TU473. 1 文献标志码:A 文章编号:1002-848X(2023)08-0143-05

DOI:10. 19701 / j. jzjg. 20201003

Study on design and application of new retaining pile with prestressed steel truss

YUAN Yuntao1,2, GUO Chentao1, LI Suchun2, HAN Shuang2, LU Ruiwu2

(1 Geotechnical Research Institute of Hohai University, Nanjing 210098, China; 2 Jiangsu Huayan ConstructionCo. , Ltd. , Suzhou 215101, China)

Abstract: Prestressed steel truss as retaining pile has not been applied in deep foundation pit. By analyzing the force formof the retaining pile, the optimized route was obtained. Taking the application of the new retaining pile with prestressedsteel truss in practical engineering as an example, the specification and size of the new type of retaining pile, the method ofprestressing force application, the construction method of filling cement soil, and the insertion construction process of pilewere introduced in detail. Taking the precast prestressed concrete I-shaped pile as the reference group, the feasibility of thenew truss pile was confirmed by comparing the measured horizontal displacement of pile top, settlement of pile top, deephorizontal displacement and the settlement of the pipelines and roads on the south side of foundation pit . The results showthat when the new truss pile and I-pile are used, the pile top settlement and pile top horizontal displacement of the twosupporting structure have little difference; the stiffness of the truss pile under the excavation surface of foundation pitdecreases along the depth, which will lead to the significant downward movement of the maximum value of the deephorizontal displacement of the pile; the settlement of the pipelines and road on the south side of foundation pit could meetthe design requirements.

Keywords:deep foundation pit; retaining pile; prestressed steel truss; I-pile; horizontal displacement;settlement;analysisof measured data

∗苏州市建设系统科研项目(2020 年度重点支持类).

第一作者:袁运涛,硕士,高级工程师,注册岩土工程师,一级建造师,主要从事岩土及地下结构工程研究工作,Email:635102933@ qq. com.

[引用本文] 袁运涛,郭晨涛,李苏春,等. 新型预应力钢桁架支护桩设计及应用研究[ J]. 建筑结构,2023,53(8):143-147,142. YUAN Yuntao,GUO Chentao,LI Suchun,et al. Study on design and application of new retaining pilewith prestressed steel truss[J]. Building Structure,2023,53(8):143-147,142.