超高层泵送混凝土施工技术研究

发布时间：2018-12-21 16:16

【摘要】：随着建筑高度的增加和超高层泵送混凝土施工技术的发展,《混凝土泵送施工技术规程》已无法满足实际施工的要求,在混凝土工程满足泵送规定的前提下,依然存在较多的堵管问题;究其原因主要有以下几点:1、混凝土的可泵性不强且配合比不规范;2、规程中的泵送压力计算公式不太适用于高强度高流动性的混凝土;3、规程中的施工控制要点和注意事项不够完善。因此,为解决以上问题,本文根据某超高层项目的堵管情况,参考该项目混凝土配合比方案,通过添加新材料石墨粉和改变各掺量比例来配制出具有良好可泵性的C60混凝土,以期减少堵管现象的发生。经坍落度实验、压力泌水实验和抗压强度实验得出新材料石墨粉具有提高混凝土可泵性的结论。当粉煤灰比例在15%~20%,石墨粉比例为5%~10%时,混凝土的和易性较好,具备良好的可泵性。而且与该超高层项目相比,在粉煤灰比例为15%、石墨粉比例为5%、沸石粉比例为20%的配合比方案下,混凝土具有更好的可泵性并可节约成本1.435元/m3。而且通过对大量文献和实际工程方案的整理与归纳,本文总结、补充了泵送设备选型的相关公式和要求,列举了不同的泵送压力计算方法并分析其各自的优缺点与适应条件,找出比较适合实际工程的公式并提出应综合考虑混凝土的惯性作用和屈服应力这两个方面来进行泵送压力计算的研究方向;最后整理了有关施工控制要点和注意事项的相关技术要求,为《混凝土泵送施工技术规程》作出补充和完善,也为类似工程的施工提供参考与借鉴。
[Abstract]:With the increase of building height and the development of concrete construction technology of super high-rise pumping concrete, the Technical Specification for concrete pumping Construction can no longer meet the requirements of actual construction. There are still many problems of pipe plugging. The main reasons are as follows: (1) the pumpability of concrete is not strong and the mix ratio is not standard; (2) the formula of pumping pressure in the specification is not suitable for high strength and high fluidity concrete; 3, the construction control points and matters needing attention in the regulations are not perfect enough. Therefore, in order to solve the above problems, according to the pipe plugging situation of a super high building project and referring to the concrete mix ratio scheme of the project, a good pumptible C60 concrete is prepared by adding new material graphite powder and changing the proportion of each dosage. In order to reduce the occurrence of pipe plugging. Through slump test, pressure bleeding test and compressive strength test, it is concluded that the new material graphite powder can improve the pumpability of concrete. When the ratio of fly ash and graphite is between 15 and 20 and the ratio of graphite powder to graphite is 5 ~ 10, the concrete is easy to work and can be pumped well. Compared with this super high level project, the concrete has better pumpability and cost savings of 1.435 yuan / m3 under the mix ratio of 15% fly ash, 5% graphitic powder and 20% boiling stone. Moreover, through the collation and induction of a large number of documents and practical engineering schemes, this paper summarizes, complements the relevant formulas and requirements of pumping equipment selection, enumerates different calculation methods of pumping pressure and analyzes their respective advantages and disadvantages and adaptive conditions. Find out the formula which is more suitable for practical engineering and put forward the research direction of pump pressure calculation which should consider the inertia action and yield stress of concrete synthetically. Finally, the relevant technical requirements of construction control points and matters needing attention are sorted out, which can supplement and perfect the Technical regulations of concrete pumping Construction, and also provide reference for the construction of similar projects.
【学位授予单位】：长春工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU755

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