摘要
为阐明液压模板台车的工作性能,并提出台车结构优化建议,设计了性能测试和工程应用试验,测定了台车框架、内外模板、加强横背楞和对拉螺栓关键节点的应力特征,明确了各关键节点的工作性能,借助工程试验验证了台车各部件的适用性,在此基础上提出了台车结构的优化建议。结果表明,台车上横梁和底梁最大应力小于30 MPa,竖梁受力不超过50 MPa,在混凝土浇筑过程中和浇筑完成后,台车框架始终处于稳定状态;内外模板最大应力在20 MPa左右,外模板应力明显小于内模板,内外模板加强横背楞最大应力在40~50 MPa之间,模板结构满足受力要求;外模板对拉螺栓受力较大,最大值接近300 MPa,超过了对拉螺栓材料的屈服强度;工程试验证明台车各部件基本满足管廊建造要求,但是综合分析表明工程实践中还需提高外模板对拉螺栓的强度。研究成果可为地下管廊液压模板台车建造技术的应用提供技术参考。
In order to clarify the working performance of the hydraulic formwork trolley and propose suggestions for the optimization of the trolley structure, the performance test and engineering application test were designed. The stress characteristics of the key joints of the trolley frame, the internal and external formwork, the stiffening cross back and the tension bolt were measured. The working performance of each key node was determined, and the applicability of each component of the trolley was verified by engineering tests. Based on this, the optimization suggestions for the vehicle structure are put forward. The results show that the maximum stress of the beam and bottom beam is less than 30 MPa, and the stress of the vertical beam is less than 50 MPa. The frame of the trolley is always in a stable state during and after concrete pouring. The maximum stress of the inner and outer formwork is about 20 MPa, the stress of the outer formwork is obviously less than that of the inner formwork, and the maximum stress of the inner and outer formwork is between 40 and 50 MPa. Therefore, the formwork structure meets the stress requirements. The tensile force of the outer formwork on the tension bolt is large, and the maximum value is close to 300 MPa, which exceeds the yield strength of the tension bolt material. The engineering test proves that the components of the trolley basically meet the requirements of pipe gallery construction, but the comprehensive analysis shows that the strength of the outer formwork on the bolt should be improved in engineering practice. The research results can provide technical reference for the construction technology of hydraulic formwork trolley for underground pipe corridor.
出处
《土木工程》
2023年第9期1223-1232,共10页
Hans Journal of Civil Engineering
