摘 要：以普通硅酸盐水泥、轻质多孔膨胀珍珠岩为主要原料，利用物理和化学方式发泡，制备了水泥基膨胀珍珠岩多孔吸声材料。研究了制备工艺、膨胀珍珠岩掺量、发泡剂种类和掺量、试样厚度、水灰比、养护温度及压力等对材料吸声性能的影响。 Abstract: The cement-based expansion perlite porous sound absorption material is prepared by normal silicate cement and light porous perlite through physical and chemical foaming. The influences of producing process, contents of expansion perlite, varieties and dosages of foaming agents, thickness of specimens, water-cement ratio, curing temperature and pressure on sound absorption properties of materials are investigate

摘 要：介绍了某固体废弃物中转车间基坑开挖过程中面临的粉煤灰填海基层塌陷、地下腐蚀性水补给速度快等问题。针对该工程基坑挡土墙的实际裂缝出现的情况进行了分析，总结了内在因素和外在因素；并针对开裂原因，采取削坡、放坡、锚喷面层、钢管支撑来进行加固，有效地阻止了裂缝的开展。 Abstract: During the foundation pit excavation of a certain solid waste transfer workshop, some problems are introduced, such as the fly ash filling sea layer sinking and collapse, corrosive underground water supply speed fast and so on. The cracks situation of the foundation pit retaining wall in the project is analyzed, and the intrinsic factors and the external factors are summarized. In view of the causes of cracking, such techniques of cutting slope, put slope, anchor bolt and shotcrete spray the surface, combined steel tube supporting to reinforce are adopted to prevent the crack development effectively.

摘 要：大模板施工工艺广泛应用于高层建筑施工，在这种施工方法中施工缝留置比较随意, 而目前对钢筋混凝土结构进行数值分析时,均认为结构是完整的,造成数值模型与实际结构不符。本文总结了施工缝的研究现状，并对施工缝的传力机理、力学模型进行了分析和探讨。 Abstract: Big template construction technology is widely used in high-rise building construction, in this kind of construction method, more casual construction joints are retained, and currently the numerical analysis on steel reinforced concrete structure are all taken structure as complete, which causes discrepant between the numerical model and the actual structure. In this paper, the research on construction joints is summarized, and the force transmission mechanism and the mechanical model of construction joints are analyzed and discussed.

摘 要：介绍了PCCP成品内压试验机的组成和各部件的功能，并针对成品PCCP不同压力等级要求，论述了如何通过计算确定水压试验机设计中的活节螺栓、内胆、水管路系统等主要结构参数。 Abstract: The components of PCCP（Prestressed concrete cylinder pipe） product internal pressure tester and every part function of the tester are introduced. And according to the different pressure level requirements of PCCP, how to determine some major structure parameters of water pressure testers by calculating（such as live join bolts, inner containers, water piping system and so on）during designing the tester is discussed

摘 要：介绍了自动化整体压制成型高铁用混凝土声屏障单元板生产技术，以解决单元板吸声面料脱落、吸声系数偏低、表面成型粗糙、形状偏差难以保证等难题，为高铁用混凝土声屏障提供优质的单元板。 Abstract: The production technology of high-speed railway concrete acoustic barrier unit plates with automation whole pressing molding is introduced, which can solve the problems such as sound absorbing fabric of unit plates exfoliated, sound absorbing coefficient lower, surface molding roughness, shape deviation hard to ensure and so on. Therefore, this technology can provide good quality unit plates for high-speed railway concrete acoustic barrier

摘 要：国内外关于植筋技术的研究基本上是在较高强度混凝土基材上进行的，而实际工程中仍存在低强度混凝土结构用植筋技术加固的案例。本文利用大型有限元软件ANSYS10.0对C15低强度混凝土中植筋进行了非线性有限元分析，分析了不同荷载下基材和受拉钢筋应力分布的规律。得到了钢筋的荷载-应力曲线和荷载-滑移曲线；求出了三种常用钢筋的极限承载力；经过分析计算，得出了强度折减系数。结果说明，C15低强度混凝土中植筋是可行的，可以指导结构加固设计。 Abstract: The research of planting-bar technique at home and abroad is basically for high strength concrete, but ?the actual engineering still exists the use of planting-bar technique in low strength concrete structure. In this paper, nonlinear finite element analysis of planting-bar in low strength concrete is carried out through finite element software ANSYS 10.0. The stress distribution rule of concrete and bar is analyzed under different loading. The loading-stress curve and loading-slip curve of bars are obtained. The ultimate bearing capacity of three common used bars is obtained, and the strength reduction coefficient of planting-bar is obtained through the calculation. The results show that using planting-bar technique in C15 low strength concrete is possible, which can guide the structure reinforcement design