大口径双曲线管廊顶进施工关键技术应用研究

发布时间：2019-06-10 19:59

【摘要】：近年来我国城镇化进程加快,随着城市规模的不断扩大,地下基础设施建设滞后、城市管网系统落后所产生的灾害在我国许多大中城市中频发,严重制约了城市的进一步发展。为解决这一难题,2015年8月,我国开始全面推动城市地下综合管廊建设。郑州市金水路西延高压输电线路架空入地改造工程是郑州市地下综合管廊建设的一部分,该工程全程采用顶管法施工,内径3.5米,外径4.14米,这是郑州市在建的最大口径的电力管廊顶进施工工程项目。本文结合此工程7#—8#井曲线顶管施工区间,利用工程中积累的经验和实测数据,对工程施工中大口径双曲线管廊顶进施工关键技术、管道在土中的受力、以及大口径双曲线管廊顶进的顶推力计算进行应用研究。具体研究内容如下:⑴总结了大口径曲线顶管的研究现状,对工程基本概况和工程难点进行阐述,简单介绍了管廊曲线顶进的基本理论、施工方法和施工工艺。⑵以金水路西延高压输电线路架空入地改造工程Ⅳ标段7#—8#井工程区间为研究背景,对顶管施工中顶管机选型、施工工艺的选择、触变泥浆减阻措施、管节之间的接头处理、中继间的设置、后背墙稳定性验算、顶进过程中的纠偏措施等重要和新颖技术进行应用研究。并计算出在顶进曲线段全截面接触时允许顶力值为31240 kN,大偏心状态下DN3500曲线顶管的允许顶力大小随着张口高度增加而减小。⑶计算出本工程场地管顶土层C、φ的加权平均值为18.13kN/m~2和27.29°,分别使用土柱理论和土拱理论计算深埋顶管管顶竖向土压力,得出结果相差20%以上,并利用ABAQUS有限元软件建立平面应力应变模型,分析管节在土中所受土压力,并与计算所得土压力大小作对比,得出在郑州市粉土地区计算深埋顶管土压力计算需要考虑土拱效应。⑷通过对顶管进行受力分析计算,推导顶力计算公式并估算出顶管顶力的顶推力大小,并将其与实测顶力值进行对比分析,得出一种适用于本工程大口径双曲线管廊顶进的顶推力计算公式。
[Abstract]:In recent years, the process of urbanization in China has accelerated. With the continuous expansion of urban scale, the construction of underground infrastructure lags behind, and the disasters caused by the backwardness of urban pipe network system occur frequently in many large and medium-sized cities in China, which seriously restricts the further development of cities. In order to solve this problem, in August 2015, China began to promote the construction of urban underground integrated pipe gallery in an all-round way. Zhengzhou Jinshui Road West extension High Voltage Transmission Line overhead ground entry Reconstruction Project is a part of Zhengzhou underground integrated pipe corridor construction, the whole project is constructed by pipe jacking method, the inner diameter is 3.5 meters, the outer diameter is 4.14 meters. This is Zhengzhou City under construction of the largest caliber power pipe gallery jacking construction project. In this paper, based on the curve pipe jacking construction interval of well 7 / 8, using the experience and measured data accumulated in the project, the key technology of large diameter hyperbolic pipe corridor jacking construction and the force of pipeline in soil are used in the construction of this project. And the application of the top thrust calculation of large caliber hyperbolic pipe gallery jacking is studied. The specific research contents are as follows: 1 the research status of large caliber curved pipe jacking is summarized, the basic situation and difficulties of the project are described, and the basic theory of pipe corridor curve jacking is briefly introduced. Construction method and construction technology. 2 based on the research background of No. 7 # well section IV of Jinshui Road West extension High Voltage Transmission Line Reconstruction Project, the type selection of pipe jacking machine and the selection of construction technology in pipe jacking construction are taken as the research background. Some important and novel techniques, such as resistance reduction measures of thixoplastic mud, joint treatment between pipe joints, setting up between relays, stability checking calculation of back wall, deviation correction measures in jacking process, etc., are studied in this paper. It is calculated that the allowable top force of DN3500 curve pipe jacking decreases with the increase of opening height when the allowable top force value is 31240 kN, when the full section contact of the jacking curve section is in contact with the full section of the jacking curve section. 3 the pipe top soil layer C of the project site is calculated. The weighted average value of 蠁 is 18.13kN/m~2 and 27.29 掳. The vertical earth pressure at the top of deep buried pipe is calculated by using soil column theory and soil arch theory, and the difference is more than 20%. The plane stress and strain model is established by ABAQUS finite element software. The earth pressure of pipe joint in soil is analyzed and compared with the calculated earth pressure. It is concluded that the soil arch effect should be considered in the calculation of deep buried pipe earth pressure in silt area of Zhengzhou. 4 by analyzing and calculating the force of pipe jacking, The calculation formula of top force is derived and the top thrust of pipe jacking force is estimated, and compared with the measured top force value, a kind of top thrust calculation formula suitable for large diameter hyperbolic pipe gallery jacking in this project is obtained.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3

【参考文献】