摘要
随着大直径、超深预制管桩的应用,管桩易出现桩身开裂、破损等影响桩基完整性的情况。对于完整性不足的桩基,以往的修补方式存在修补效果不明显,施工不经济的问题。本文以一全预制装配桥梁工程为例,开展管桩精细化修补方法研究。首先,基于高应变法,针对完整性为Ⅲ类的桩基提出不合格桩基的治理流程,并进一步确定完整性系数最小值的位置。通过L-pile软件计算分别计算弯矩、剪力的影响范围,针对位于承载力影响区范围内的桩基进行修补。然后,以钢筋混凝土为填芯材料,开展桩身正截面承载力计算和修补长度分析。通过参数分析得出破损位置以下的填芯长度的影响,确定优化后的填芯长度值。本文提出的精细化修补方式在工程中取得良好效果,具有推广价值。
With the application of large-diameter and ultra-deep prefabricated hollow piles,pile cracking and damage that affect the integrity of pile foundation cannot be ignored.For the pile with insufficient integrity,the previous repair method is not effective and the construction is not economical.This paper takes prefabricated hollow piles construction project of a fully prefabricated assembly bridge as an example,and introduces refinement repair method of high-strength prefabricated hollow pile.Firstly,based on the high strain method,the treatment process of unqualified pile is proposed for the pile within class III,and the position of the minimum integrity coefficient is further determined.The scope of L-pile software calculates affected area of bending and shear,and repairing above the bearing capacity affected area is repaired.Then,with reinforced concrete as the core filling material,the bearing capacity of pile section and repair length are calculated.The influence of core length below damaged position is obtained by parameter analysis,and optimized core length value is determined.The fine repairing method proposed in this paper has achieved good results in engineering and has promotion value.
作者
李晓鹏
刘晓敏
周俊龙
靳春尚
肖永刚
LI Xiaopeng;LIU Xiaomin;ZHOU Junlong;JIN Chunshang;XIAO Yonggang(China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300171,China;China State Construction Bridge Co.,Ltd.,Chongqing 402260,China)
出处
《建筑结构》
北大核心
2023年第S01期2724-2728,共5页
Building Structure
基金
中建股份科研课题(CSCEC-2020-Z-21)
关键词
预制管桩
桩身开裂
完整性
修补方法
精细化施工
precast hollow pile
pile crack
integrity
repair
refinement construction
