泵送混凝上有输送量大、效率高的独特优点,采用布料杆在距离远和高层输送混凝土,能起到快速、连续作业的效果。用于深基础、高层建筑施工,布料杆半径周围范围内可任意浇注混凝土。但泵送混凝土也有其特殊要求和不足之处,如要求混凝土一次浇筑量较大,不宜间隙作业,骨料配合比要求严格,水泥用量较大等。国外承包者对泵送混凝土施工,一般须进行估算,选择设备,积累了较多经验,现根据收集到的一些国外资料介绍如下,供国内施工单位参考。一、关于管线压力和设备选择问题 Pumping coagulation has the unique advantages of large transport volume and high efficiency. The adoption of the distribution poles to transport concrete at a distance and a high level can achieve rapid and continuous operation. For deep foundation and high-rise building construction, the concrete can be cast freely in the area around the radius of the distributor pole. However, pumping concrete also has its special requirements and deficiencies, such as requiring a large amount of concrete poured once, not suitable for gap operations, strict requirements of aggregate mix ratio, a large amount of cement and so on. Foreign contractors generally estimate the construction of pumped concrete, select equipment, and accumulate more experience. Now they are introduced according to some of the foreign materials collected for reference by domestic construction agencies. First, on the pipeline pressure and equipment selection