Hefei, Jinan grouting material - pumping the grouting material of construction of 11 large Precautions 
 Construction pipeline grouting material from production, to warehousing, the whole process by mixing station, truck, pumps, etc., distributed, any link problems (such as mechanical failure, transportation routes blocked, etc.) will directly affect the grouting material pouring Quality. Therefore, a good grasp of each session. 
 1, mixing, transportation 
 Grouting materials, of Hefei grouting material mixing, weighing and mixing time should be consistent with the requirements of the specification, the transport of road as flat, in order to avoid transportation vehicles over the vibration leaving the grouting material segregation, leakage pulp, severe bleeding and loss of slump. 
 In addition, in order to ensure the grout pump, you can not add water, mixing the dry ingredients, then transported by truck to the pumping field (the transit time should be consistent with the table-specific requirements by another mixer, add water mixing 90s over such grouting material mixing fully, greatly reducing the grout material, Hefei, the grouting material segregation, bleeding and plasma leakage and loss of slump is not conducive to the pumping of the grouting material and the factors that affect the quality of the grouting material. 
 2, grout pumping 
 Start pumping, the first conveying the right amount of concrete strength grade stone grouting material lubrication conveying wall, followed by transportation grouting material. 
 Pumping process, subject to the hopper should always leave enough grouting material to prevent inhalation of air blockage. To a long time to stop pumping, required every 4 ~ 5min. Pump, anti-pump 2 stroke, and then pump 2 stroke to prevent the grouting material condenses in the tube. If downtime is more than 30min (depending on temperature, the slump may be) would be appropriate grouting material removed from the pump and pipeline for small slump grouting material, Hefei grouting material should be strict attention. 
 3, the congestion in the construction of pumping grout material and exclude 
 ⑴ blockage of the possible causes and prevention. Deal with congestion is a very troublesome thing, so in order to prevent clogging was mainly from the following aspects to be prepared to reduce the likelihood of clogging. 
 ① In the grouting material, the quality of grouting material in Hefei. The workability of the grout, and performance for the aggregate size is too big or grading does not meet the requirements; sand rate is too low or the grading does not meet the requirements; cement content inappropriate or do not meet quality requirements; uneven mixing or stirring time stay too long has been segregation; artificial lightweight aggregate water absorption is too large. Its slump unstable. Cohesive, poor water retention. Is caused by congestion due to the quality of grouting material, on-site management staff should be strictly controlled and prevention. 
 ② in the pipeline. Pipe joints leakage caused by the slump decline in the course of transmission, pressure relief, bend radius of the bend is too small, the pipe is not straight into the groove, the pipeline is not aligned. 
 ③ In the operational aspects. To be expected downtime is too long. 
 ⑵ plugging after the occurrence of grout, the Hefei grouting material handling measures. Plugging occurred, the first anti-pump dredge, anti-pump dredge is invalid, they should immediately determine the blockage site, stop the clean-up pipeline. 
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