新型快凝无机植筋胶栓植筋性能试验研究

发布时间：2018-05-06 05:04

本文选题：植筋技术 + 快凝特性　；参考：《湖南大学》2015年硕士论文

【摘要】：二十世纪五十年代以来,建国初期建的很多既有建筑已经进入“中老年期”,我国的基础建设正从大量新建向部分新建部分维修转型。因此,既有建筑设施的维修与加固正蓬勃发展。在维修加固技术中,植筋加固技术由于施工工艺简单、效果理想,已经成为加固技术中一个重要的方法。植筋加固技术是利用植筋胶将钢筋植入结构体内的一种加固技术。传统的植筋多采用有机材料,但普遍存在凝结时间长、耐高温性能差、耐久性差,以及弹性模量低的局限性。为了解决有机植筋胶的上述问题,研制了一种新型快凝无机植筋胶。通过多组试验确定其胶凝材料的配合比,使其符合试验所需的抗压强度及快凝特性。在试块上植筋,在相应条件下进行拉拔试验,对比不同条件下的植筋极限拉拔承载力,分析各因素对拉拔强度的影响。根据拉拔试验中植筋体的破坏现象,并查阅国内外相关研究文献,总结出无机植筋胶植筋的破坏形态;根据拉拔试验植筋体的极限拉拔承载力,总结出无机植筋胶极限拉拔承载力的计算公式。植筋常用于建筑加固工程中植入剪切销钉。工程中植入剪切销钉主要用来抗剪,这一量值与前面所述的极限拉拔承载力并无直接关系。本文为研究剪切力关系与极限拉拔承载力的关系,通过对在加固梁试件中的销钉进行拉拔试验来研究。为描述剪切销钉质量,给出其拉拔合格值的定义。相关的加固技术标准尚未涉及无机胶高温下的性能,通过在混凝土试块上分别采用有机胶和无机胶植筋,对比高温条件下有机胶与无机胶的极限拉拔承载力,对无机胶的耐高温性能进行分析。选择在长沙的夏季做露天环境下距混凝土表面不同深度处的温度测试试验,测得结构构件处于自然正常工作环境下时植筋胶的工作温度。将改进后更适合于实际情况的植筋胶应用于郴州市某加固工程,其剪切销钉采用无机植筋胶植入。通过抽样检测,得到梁、柱剪切销钉的极限拉拔承载力,植筋效果符合预期期望。
[Abstract]:Since the 1950s, many existing buildings built in the early days of the founding of the people's Republic of China have entered the "middle and old age period", and the basic construction of our country is transforming from a large number of new construction to part new partial maintenance. Therefore, the maintenance and reinforcement of existing building facilities is booming. In the maintenance and reinforcement technology, the reinforcement technology has become an important method because of its simple construction technology and ideal effect. Reinforcement is a kind of reinforcement technique which is used to implant steel bars into the body of the structure. Organic materials are often used in the traditional planting tendons, but there are many limitations such as long setting time, poor high temperature resistance, poor durability and low elastic modulus. In order to solve the above problems of organic gluten, a new type of fast coagulating inorganic gluten was developed. The compounding ratio of the cementing material was determined by multi-group tests to make it conform to the compressive strength and fast setting characteristic of the test. The ultimate pull-out capacity was compared under different conditions, and the influence of various factors on the pull-out strength was analyzed. According to the damage phenomenon of the tendon body in the drawing test, and referring to the domestic and foreign related research literature, the failure pattern of the inorganic gluing tendon was summarized, and the ultimate drawing capacity of the steel bar was obtained according to the drawing test. The calculation formula of ultimate drawing capacity of inorganic gluten was summarized. Rebars are often used to insert shear pins in building reinforcement projects. Shear pins are mainly used for shear resistance in engineering, which has no direct relation to the ultimate drawing capacity. In order to study the relationship between shear force and ultimate pull-out capacity, the pull-out test of pin in strengthened beam specimen is carried out in this paper. In order to describe the quality of shearing pin, the definition of drawing qualification value is given. The performance of inorganic adhesive at high temperature has not been involved in the relevant technical standards of reinforcement. The ultimate drawing capacity of organic adhesive and inorganic adhesive under high temperature is compared by using organic glue and inorganic glue to plant steel bar on concrete test piece. The high temperature resistance of inorganic adhesive was analyzed. The temperature test at different depths from the surface of concrete was conducted in summer in Changsha, and the working temperature of gluten was measured when the structure member was in the natural normal working environment. The modified gluten was applied to a reinforcement project in Chenzhou, and the shear pin was implanted with inorganic gluing glue. The ultimate pull-out capacity of shear pin is obtained by sampling test, and the effect of planting steel bar is in line with the expected expectation.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU746.3

【参考文献】