The panel discussion was held in three groups. Technical exchanges and practical experience exchanges were carried out on the prestressed concrete pool structure technology, the engineering practice experience of soft soil foundation treatment and the underground pipeline structure technology. A total of 62 papers were exchanged at the meeting. Among them, there are 17 chapters on pool structure, 12 foundation treatments, 1 pipeline structure, 5 slope support protections, and 17 other related to crack calculation, vibration calculation, magnetic suspension technology, light rail tunnel, anti-corrosion technology and network technology. The content of the exchange is extensive, but it is still dominated by various pool structures, soft soil foundation treatment and various pipeline structures. Regarding the application of prestressing technology in the structure of the pool, in the past, only the pre-stress of the wrapped wire in the circular pool was summarized, and the design specifications were listed. However, the unbonded prestress and partial prestress which are widely used in China today. Technology, there is no design and construction technical specifications for the characteristics of the pool structure, according to which the key discussion in the technical exchange.
On the basis of fully summarizing the practical experience, we hope to formulate technical standards and specifications that reflect the characteristics of the pool structure, so as to improve and standardize the design and construction technology level of the prestressed water tank, and better serve the construction of China's water industry projects. In addition, foundation treatment is also the focus of technical exchanges over the years, mainly because the construction sites of water industry projects are mostly located at the edge of towns, engineering geology and hydrogeology are poor, while some structures in water industry projects have little additional load and volume. The large features and control deformation requirements are more prominent, which leads to ground treatment becoming a common problem. The closing ceremony of the conference was chaired by the deputy director and the chief engineer of Shanghai Municipal Engineering Design and Research Institute Wang Dary, the executive vice chairman of the Water Industry Branch, the dean of the Beijing Municipal Engineering Design and Research Institute, Qu Cishui, and the Xi'an municipal design study. Dean of the High Court attended the closing ceremony. At the meeting, the chairman of the committee, Shen Shijie, summarized the academic exchanges of the meeting. Among them, it is mentioned in the exchange paper that many articles relate to the newly revised series of water supply and drainage engineering structural design standards. This is a very good phenomenon. It is also proposed that it is clear that this series of standards belongs to the water industry. The general standard (GB) and special standard (CECS) of engineering structure professional, when applied, only when these standards are specified according to other standards, can not be mixed, so as to avoid unnecessary confusion.
For example, the measures relating to durability require that the "Concrete Structure Design Code" is divided into several different types of environments, and the requirements are separately formulated; while the environmental conditions of the structures and pipeline structures in the water industry engineering are specific, and accordingly, the durability is proposed. The water-cement ratio control of concrete; the application of cement; the anti-seepage and anti-freezing requirements of antimony; the control of alkali content; the thickness of net protective layer of steel; the crack resistance of structural members (medium pull, small pull) and crack Width (bending, large deflection, large bias) control; and such as the calculation formula of crack width, the corresponding international standards are also very uncoordinated, domestic based on slip theory, but the actual experiment "crack spacing" dispersion is very Large, the "maximum crack width" is more discrete, and the structure in the water industry project is dominated by plates and shells, which is different from industrial civil buildings.
Therefore, whether the formula for calculating the crack width is applicable, the only criterion for identification is engineering practice, which is undoubtedly the most fundamental; in addition, the application of the internal and external additives of silicon, the economic indicators of prestressed water and water structures are also carried out in the summary. The explanation. In short, it should be recognized that in the current series of water supply and drainage engineering structural design series standards (which should also include seismic design standards), there are still many issues that need to be further enriched and improved. It is very beneficial to pass this technical exchange and interoperability. of. At the same time, this meeting should also notice that many young people participated in this technical exchange. This is a gratifying event, which fully reflects the successor of our professional team and provides a strong technical development. Protection. Finally, the dean of Qu Jishui gave a speech on behalf of the organizers of the conference, and thanked the members and representatives for their support. Thanks to the cooperation between Xi'an Municipal Management Committee and Xi'an Municipal Design and Research Institute; thanks to Jiangxi Wuguan Industrial Co., Ltd. The Group, Henan Yongli Chemical Co., Ltd. and other strong support from many companies across the country provided good conditions for the meeting.
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