沣东新城综合管廊E区钢板桩工程质量研究

发布时间：2019-04-04 12:35

【摘要】：市场经济发展使得各个城市有更多的人力物与投入工程项目建设,我国城市综合管廊工程的建设已在各城市全面展开,推进社会资本加大对公共产品有效开发、促进社会资本投入基础设施建设,带动城市经济发展。沣东新城综合管廊项目,属于湿陷性黄土地层;其地质条件影响施工进度、质量、安全。因此向管廊基坑支护的质量、安全性、经济性提出了高要求。由于项目在湿陷性黄土地质条件下前期的试桩过程中,钢板桩在分别进入细沙层、中砂层等过程中,砂层密实度骤增,引起钢板桩无法进尺,达不到设计支护深度,钢板桩支护的稳固性、可靠性受到影响。为解决此问题,文章从如下几个方面进行了研究:(1)本文先通过总结前人对质量控制的研究成果,使用系统性归纳了当前的工程项目管理理论成果,详细且系统的对建设工程项目质量管理和控制的相关原理与方法做出了研究。(2)通过对三桥新街E区综合管廊的工程概况,地质条件,项目设计要求及项目施工的周边环境等事前质量控制因素进行综合研究分析,结合现场作业实际,通过水刀法引孔工艺,解决了在湿陷性黄土地质条件下钢板桩施工过程中达不到设计深度和支护稳定性的要求。(3)本文在前期成功试桩的基础上,通过采用基坑支护结构FRWS7.2软件,根据二级基坑计算进行验算,计算结果验证了原设计钢板桩支护方案的安全性、可行性和合理性;为现场大规模钢板桩作业施工提供科学的计算支撑和质量控制基础,实现预定的环境目标和成本目标,为类似工程项目深基坑支护质量控制提供参考。同时利用局部土锚对钢板桩的拉力作用,通过减少钢板桩的变形,使钢板桩抵抗土压力提高,从而达到了支护要求。利用在砂层较厚的细砂、中砂层中钢板桩顺利施工的应用,拓展了拉森SP-Ⅳ型钢板桩在城市管廊特殊地质砂层中的应用前景。
[Abstract]:The development of market economy makes every city have more manpower and investment in the construction of engineering projects. The construction of urban comprehensive pipe porch project in China has been carried out in all cities in an all-round way to promote the effective development of public goods by increasing social capital. We will promote the investment of social capital in infrastructure construction and drive the economic development of cities. Fengdong new city comprehensive pipe corridor project, belongs to collapsible loess stratum; its geological condition affects construction progress, quality, safety. Therefore, the quality, safety and economy of pipe porch foundation pit support are required. During the pre-test pile test of the project under collapsible loess geological conditions, the density of sand layer increased abruptly in the process of steel sheet pile entering into fine sand layer and middle sand layer respectively, which resulted in steel plate pile being unable to enter the scale and unable to reach the designed support depth. The stability and reliability of steel sheet pile support are affected. In order to solve this problem, this paper has carried on the research from the following several aspects: (1) by summarizing the predecessor's research results on quality control, this paper systematically sums up the current engineering project management theory achievement by summarizing the predecessor's research results. The related principles and methods of quality management and control of construction projects are studied in detail and systematically. (2) through the engineering survey and geological conditions of the integrated pipe porch of Sanqiao New Street E area, this paper makes a detailed and systematic study on the related principles and methods of quality management and control of construction projects. The design requirements of the project and the surrounding environment of the project construction are comprehensively studied and analyzed in advance, and combined with the practice of the field operation, the technology of leading holes by water knife method is adopted. The requirements of steel sheet pile construction under collapsible loess geological conditions can not reach the design depth and support stability. (3) on the basis of successful pile test in the early stage, the FRWS7.2 software of foundation pit supporting structure is adopted in this paper. Based on the calculation of two-stage foundation pit, the safety, feasibility and rationality of the original design of steel plate pile support scheme are verified by the calculation results. It provides scientific calculation support and quality control foundation for the construction of large-scale steel plate pile on the spot, realizes the predetermined environmental and cost targets, and provides reference for the quality control of deep foundation pit support in similar projects. At the same time, the tensile force of the local soil anchor on the steel plate pile is used to reduce the deformation of the steel plate pile so as to increase the resistance of the steel plate pile to the earth pressure, so as to meet the requirements of the support. The application of steel sheet pile in thick fine sand and medium sand layer to the smooth construction of steel sheet pile has expanded the application prospect of Larsen SP- IV steel sheet pile in special geological sand layer of urban pipe porch.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753.3;TU712.3

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