|本期目录/Table of Contents|

[1]吴文清,陈小刚,李波,等.预应力混凝土连续箱梁施工质量评价指标调查[J].建筑科学与工程学报,2009,26(03):42-48.
　WU Wen-qing,CHEN Xiao-gang,LI Bo,et al.Investigation of Construction Quality Evaluating Indices in PC Continuous Box-girder[J].Journal of Architecture and Civil Engineering,2009,26(03):42-48.
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
26卷
期数:
2009年03期
页码:
42-48
栏目:
出版日期:
2009-09-20

文章信息/Info

Title:
Investigation of Construction Quality Evaluating Indices in PC Continuous Box-girder
作者:
吴文清1,陈小刚2,李波1,谢群华1
1.东南大学交通学院,江苏南京210096;2.浙江省交通规划设计研究院,浙江杭州310006
Author(s):
WU Wen-qing1, CHEN Xiao-gang2, LI Bo1, XIE Qun-hua1
1. School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China; 2. Zhejiang Provincial Planning Design & Research Institute of Communications, Hangzhou 310006, Zhejiang, China
关键词:
桥梁工程;  预应力混凝土连续箱梁;  孔道灌浆;  混凝土超方;  施工质量;  评价指标
Keywords:
bridge engineering;  PC continuous box-girder;  duct grouting;  concrete overweight;  construction quality;  evaluating index
分类号:
U446
DOI:
-
文献标志码:
A
摘要:
基于3座预应力混凝土连续箱梁桥的拆除工程,对预应力混凝土箱梁结构的预应力孔道灌浆饱满度、混凝土超方量及混凝土保护层厚度等施工质量评价指标进行了实地调查,并对实测指标进行了统计分析,揭示了预应力混凝土连续箱梁的施工质量现状。结果表明:中国预应力混凝土连续箱梁的总体混凝土超方率偏大,超方率一般在10%～20%,混凝土超方主要集中在箱梁顶板和底板; 箱梁纵向预应力孔道灌浆不密实的比例超过50%,横向预应力孔道灌浆未达到密实状态的比例也超过70%,上述情况将使结构预应力损失增大; 同时,截面混凝土超方及预应力损失增大将使预应力混凝土箱梁截面主拉应力增长明显,从而增大结构开裂的可能性; 提出的量化分析指标有助于正确认识预应力混凝土箱梁桥上部结构普遍开裂和下挠过大的内在原因,为此类结构的研究提供了重要的依据。
Abstract:
Based on the dismantlement of three prestressed concrete(PC)continuous box-girder bridges, several construction quality evaluating indices for PC box-girder structure were investigated on the spot,which consisted of the duct groutingdensity degree of prestressing bars, concrete overweight percent and concrete protector thickness and so on, and then the indices were analyzed statistically to find out the current construction quality of PC continuous box-girder. The results indicate that the overweight ratio of PC continuous box-girder in China is on the high level generally, it varies between 10% and 20%, and the performance of concrete overweight centres at top slab and low slab of box-girder generally. The duct area percentage of partial grouting for longitudinal prestressing bar is more than 50%, and the percentage for lateral prestressing bar duct grouting is more than 70%, but the performance of duct grouting being noncompacted in a large proportion make the prestressing loss increase obviously. In another side, the true calculating example in the paper indicates that concrete overweight and prestressing loss will enlarge the principal tension stress in PC box-girder, and make the possibility of structure cracking increase. The quantized surveyed indices proposed in the paper is helpful to realize the actual reason for cracking and big flexural down-warping of PC box-girder bridge, and also provide the important basis for structural analysis of PC box-girder.

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备注/Memo

备注/Memo:
收稿日期:2009-06-15
基金项目:国家高技术研究发展计划(“八六三”计划)项目(2007AA11Z106)
作者简介:吴文清(1964-),男,浙江龙游人,副教授,工学博士,E-mail:wqwuxu@163.com。
更新日期/Last Update: 2009-09-20