大型核、火电厂取水结构施工技术研究

发布时间：2018-07-02 22:34

本文选题：取水水工结构 + 循泵房沉井　；参考：《上海交通大学》2014年硕士论文

【摘要】：大型核、火电厂厂址多位于沿江、滨海地区,地质条件复杂,其取水构筑物均为大型水工结构,如超大超深的循泵房沉井、大口径取水管道和取水口等,施工具有相当大的难度和风险,因此针对沿江、滨海复杂软土地层中大型取水结构施工关键技术研究有着十分重要的理论意义和工程应用前景。本文依托多个实际工程,运用理论分析、数值模拟、工程实测、方案比选等方法,对大型核、火电厂取水水工结构的循泵房沉井、取水隧道和取水口施工技术进行较系统性地研究,主要研究的内容和结果如下:1.通过开展深井降水工艺、沉井下沉、助沉纠偏措施等关键技术的研究,结合施工方案比选,研发了高灵敏性软土中保护沉井嵌套桩的工艺,并将研究结果应用于江边细砂与海岛高灵敏性软土区域的循泵房沉井施工,在保障工程安全顺利完成的同时加快了施工进度、降低了工程造价。2.针对华能金陵电厂取水盾构需穿越江底抛石沉降区的施工难题,开展了盾构隧道结合气压清障施工工艺和技术的研究,并将成果应用于该工程,使盾构顺利穿越抛石沉降区,可为类似清障工程提供参考。3.在始发段为岩、土交界面的核电取水隧道施工工艺和关键技术研究中,将土压平衡盾构、新奥法、清障技术进行集成创新,首次将该集成创新工艺运用于施工,使盾构机顺利穿越复杂地层,完成了中国核电领域首个大直径盾构海底隧道。4.针对核电超大口径垂直顶升施工难题,研制了相关配套设备、开发了超大口径垂直顶升施工工艺,研究成果在三门核电一期工程中得到首次成功应用。本论文获得的施工工艺和技术研究成果,包括砂层及高灵敏性软土中沉井制作下沉控制技术、助沉纠偏措施、对嵌套桩的保护工艺;抛石沉降区中盾构结合气压清障工艺;岩土交界面中盾构、新奥法、清障技术的集成创新技术;开发的超大口径垂直顶升施工工艺,在工程中均得到了成功应用,可为今后类似的工程提供借鉴和参考。
[Abstract]:The sites of large nuclear and thermal power plants are mostly located along the Yangtze River and coastal areas, and the geological conditions are complex. The water intake structures are all large-scale hydraulic structures, such as ultra-deep caisson, large-caliber water intake pipes and water intake outlets, etc. The construction is very difficult and risky, so it is very important to study the key technology of the construction of large water intake structure along the river and in the coastal complex soft soil strata, which has very important theoretical significance and engineering application prospect. Based on many practical projects, this paper applies the methods of theoretical analysis, numerical simulation, engineering measurement, scheme comparison, etc., to the caisson of a large nuclear and thermal power plant's hydraulic structure. The construction technology of water intake tunnel and water intake is studied systematically. The main contents and results are as follows: 1. Through the research of the key techniques such as deep well dewatering technology, sinking and correcting measures, combined with the comparison and selection of construction scheme, the technology of protecting the nested piles in the high sensitive soft soil is developed. The application of the research results to the caisson construction in the area of riverside fine sand and island high sensitivity soft soil can ensure the project to be completed safely and smoothly at the same time accelerate the construction progress and reduce the project cost. In view of the construction problem that the shield machine of Huaneng Jinling Power Plant needs to pass through the riprap settlement area at the bottom of the river, the research on the construction technology and technology of shield tunnel combined with air pressure clearing barrier is carried out, and the results are applied to the project to make the shield tunneling pass smoothly through the riprap settlement area. It can provide reference for similar obstacle clearing projects. 3. In the study of the construction technology and key technology of the nuclear power intake tunnel at the interface of rock and soil, the integrated innovation of earth pressure balance shield tunneling, new Olympic method and barrier clearing technology was carried out, and the integrated innovation technology was applied in construction for the first time. The shield machine has successfully crossed the complex stratum and completed the first large diameter shield tunneling. 4. In view of the construction problem of super-large caliber vertical jacking in nuclear power plant, the related equipment was developed, and the construction technology of super-large caliber vertical lifting was developed. The research results were successfully applied in the first phase of Sanmen nuclear power project for the first time. The research results of the construction technology and technology obtained in this paper include the sinking control technology in sand layer and high sensitive soft soil, the measures to help the settlement and correction, the protection technology of nested pile, the shield combined with barometric barrier cleaning technology in the area of riprap settlement, and the control technology of sinking-control in sand bed and high sensitive soft soil. The integrated and innovative technology of shield tunneling, new Olympic method and barrier clearing technology in the interface of rock and soil, and the construction technology of super large caliber vertical jacking have been successfully applied in engineering, which can be used for reference and reference for similar projects in the future.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.1

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