后张预应力真空压浆施工质量控制     

高磊  郭井宽 《黑龙江科技信息》2011,(15):291-291

真空压浆技术是提高后张预应力混凝土桥梁安全性和耐久性的有效方法。这种方法本身的性质决定了它需要具有高水平的质量控制。由于施工影响因素多,施工现场最终压浆效果不易评判,所以必须重视真空压浆的施工质量控制工作,不断完善施工工艺,确保压浆浆体密实、孔道饱满、安全可靠。  相似文献   

某无粘结预应力平板工程的加固设计及施工技术探讨     

龚文娟 《黑龙江科技信息》2011,(23):189+156-189,156

本文针对某商场首层无粘结预应力平板局部增加底坑,采用有限元分析计算,并用粘碳纤维布的加固方法对原预应力板结构进行加固设计,最后对施工技术提出探讨。  相似文献   

预应力技术在我国桥梁结构中的应用     

王伟 《黑龙江科技信息》2011,(21):280-280

对预应力技术在我国桥梁结构中发展状况进行分析,阐述了预应力在我国桥梁施工中的具体应用。  相似文献   

浅谈砖混结构预制板顺板缝裂缝的原因及防治     

王云峰  任磊钦 《黑龙江科技信息》2011,(24):324-324

通过对几个住宅小区楼板板缝开裂的现场检查,认为一般由原材料质量、地基不均匀沉降、施工工艺、温度变形、预应力空心板徐变等因素引起,而施工工艺达不到规范要求和预应力空心板徐变是导致裂缝的主要原因。针对以上情况提出了相应的防治对策。  相似文献   

箱梁预应力施工工艺及质量控制要点     

马学会 《黑龙江科技信息》2011,(30):312-312

本文结合甘肃省酒嘉城际一级公路北大河桥20米预应力箱梁施工,介绍了后张法预应力箱梁的施工工艺及质量控制要点。  相似文献   

建筑结构设计对张拉控制应力和预应力损失的要求     

赵艳丽  韩克航 《黑龙江科技信息》2011,(33):309-309

在施工阶段,张拉控制应力就是预应力钢筋所受的最大应力。引起预应力损失的因素很多,而且相互影响、相互依存,建筑结构设计对张拉控制应力和预应力损失具有一定的要求,要精确计算和确定预应力损失是一项非常复杂的工作。  相似文献   

预应力混凝土转换梁设计与施工     

涂远 《廊坊师范学院学报(自然科学版)》2014,(3):73-75

通过工程实例,介绍运用中国建筑科学研究院编制的结构设计软件PKPM计算预应力混凝土转换梁的方法,绘制了施工图,并讨论了预应力混凝土转换梁施工中应注意的关键问题.  相似文献   

Deformation mechanism of high-stress and broken-expansion surrounding rock and supporting optimization based on the gray correlation theory     

YU Wei-jian  WANG Ping  DU Shao-hua 《重庆大学学报(英文版)》2014,13(3):99-114

Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deformation and damage of roadway surrounding rock and an analysis of its mechanism were carried out. The gray correlation theory was used in support scheme optimization design. First, causes and mechanism of deformation of the 1 000 m horizontal transport channel were analyzed through field investigation, laboratory test and data processing methods. We arguued that poor engineering geological conditions and deep pressure increases were the main factors, and the deformation mechanism was mainly the ground deformation pressure. Second, the gray correlation theory was used to construct supporting optimization decision method in the deep roadway. This method more comprehensively considers various factors, including construction, costs, and supporting material functions. The combined support with pre-stressed anchor cables, shotcrete layer, bolt and metal net was put forward according to the actual roadway engineering characteristics. Finally, 4 support schemes were put forward for new roadways. The gray relational theory was applied to optimizing the supporting method, undertaking technical and economic comparison to obtain the correlation degree, and accordingly the schemes were evaluated. It was concluded as follows： the best was the flexible retaining scheme using the steel strand anchor; the second best was the one using plate anchors on the top and rigid common screw steel bolt on the two sides; the ttiird was; the rigid common screw steel bolt in full section of roadway; and the worst is the planished steel rigid support. The optimized scheme was applied to the 1000 m level of new excavation roadway. The results show that the roadway surrounding rock can reach a stable state after 5 to 6 months monitoring, with a convergence rate less than 1 mm/d.  相似文献   

连续箱梁桥拓宽拼接方式的分析     

王宗红 《淮北职业技术学院学报》2014,(3):114-115

基于高速公路上混凝土连续箱梁桥的不同特点,结合拓宽工程实践,总结了现有刚接及铰接方式的适用范围及具体构造,然后针对错孔布置桥梁拼接受力复杂、三向预应力箱梁拼接不能破坏横向预应力以及大跨径桥梁拼接等工程难题,提出了箱梁间不连接或弱连接的构造设想,以期对同类工程有参考价值。  相似文献   

预应力混凝土空心板产品质量通病     

付玉玲 《凯里学院学报》2006,24(3):67-67

预应力混凝土空心板在我国城乡建设中广泛使用,极大地满足了我国生产建设需要.一些生产者为谋取利益,降低生产标准、违反质量规范,制造了大量不符合质量要求的产品,给人民的生命、财产安全带来了严重隐患.笔者根据多年工作经验,总结出该产品的质量通病,并提出了应对措施.  相似文献