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近年来,泵送混凝土施工技术有了很大发展。随着固定式泵转变为车载泵,其机动性增加了,并向大型化发展,输送能力比当初的10m~3/h提高约10倍。在固定泵配管中由于采用了吊杆和软管,排出口能连续方便地进行小距离挪动。在大直径管道利用、布料机开发及特殊管的多样化等方面也下了种种的功夫。在长距离和高处送灰问题上,出现了新的挑战,实际纪录不断刷新。混凝土在管内的流动状态可从压力实测中得知,已有了根据单位长度管道压送阻力和泵的能力求压送界限的方案。一、泵送技术的现状 1.压送计划的制订方法现在在选定混凝土泵和研究配管时,一
In recent years, great progress has been made in the construction technology of pumped concrete. As the fixed pump is transformed into an on-board pump, its mobility is increased, and its large-scale development has resulted in an increase in transport capacity of about 10 times from the original 10m~3/h. Due to the use of booms and hoses in the fixed pump piping, the discharge port can be continuously and easily moved in small distances. Various efforts have also been made in the utilization of large-diameter pipes, the development of distributors, and the diversification of special pipes. In the long-distance and high-level issues of graying, new challenges have emerged and the actual record is constantly being refreshed. The flow state of the concrete in the pipe can be known from the pressure measurement, and a scheme for determining the pressure transmission limit according to the pressure feeding resistance per unit length of the pipe and the capacity of the pump has been proposed. First, the status of pumping technology 1. Method of formulating a pressure delivery plan Now when selecting concrete pump and research piping, one