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Construction and Analysis of Pumping Concrete Construction
Abstract: In this paper, the application of pumping concrete construction technology in Luoyang City, the status quo and existing problems were analyzed and engineering examples show that the pumping of concrete construction technology has good social and economic benefits. In order to promote the technology better, the author put forward some concrete suggestions on the development of pumping concrete equipment, the research and development of pumping concrete, the research and application of admixture and admixture and the establishment of commercial concrete base. 0 Preface China's pumping of concrete construction Ji began in 1979 Baoshan Iron and Steel Plant in Shanghai project, currently used in major coastal cities and key national projects, not yet fully promoted in the country. One of the main reasons for the technical requirements of the pump pumping concrete higher than ordinary concrete, and second, to increase the high liquidity of concrete must use admixtures and admixtures, the third is a one-time investment in equipment, and higher quality Construction organization and operation staff. Pumping technology has good social and economic benefits, should be organized to promote. In this paper, the construction of Luoyang Zhongya Hotel as an example analyzed the application of the technology in Luoyang City, and discussed the future should focus on solving the problem. A project example In the nineties the construction of five-star Luoyang Central Asia Hotel, the main structure of the project height of 89.15m, the total amount of concrete 5500m3, concrete design strength classes C50, C40 and C30. As the main body of the building is high, the amount of concrete used is large (the daily maximum pouring capacity is 300m3), the conventional crane can not meet the requirements of engineering progress, concrete pouring quality and pouring strength. Therefore, an automatic concrete mixing plant is set up in the site and pumping concrete Construction technology. 1.1 Selection of raw materials and concrete mix The selection of cement Luoyang Cement Yellow River brand 52.5R, 42.5R Portland cement; coarse and fine aggregate selection of Luoyang good quality local production of sand; admixture selection FDN22000, FDN25C and FN22 , Can adapt to the construction of different seasons. In order to improve the workability of concrete, reduce heat of hydration, reduce and prevent the generation of shrinkage cracks and temperature cracks, reduce the amount of cement to ensure good pumpability and segregation phenomenon, take full advantage of the effect of fly ash, Mixed with concrete in the amount of 5% to 10% of Yao and Meng Power Plant dry row production of â… , â…¡ fly ash, the quality of the test have reached or exceeded GBJ146 -90 standards. According to "Technical Specification for Design of Mixture of Common Concrete" (JGJPT55296), the test strength fcu = fcuk + 1.645σ (σ value 5.5MPa) and the slump control (180 ± 20) mm. After testing the mix proportion of concrete with different pumping height and strength, it is determined that the mixing ratio is shown in Table 1. 1.2 The configuration and construction of pumping equipment selection Hubei production HBT60 towed pump. In the pump tube layout, try to reduce the elbow and hose, elbow bend as far as possible to minimize the pumping pipe resistance. Strict compliance with operating procedures to prevent segregation and clogging of concrete mixes. In addition, a HZS50 automatic concrete mixing plant is set up on the construction site to ensure the mixing quality and supply of concrete. High-rise pumping concrete is a systematic project that requires tight construction organization, otherwise it will cause nesting and quality accidents. Central Asia Hotel construction, from concrete mixing station to the construction site have conducted a full range of strict management.