Li Ruoyu continued: "The excessively high column or wall should not be poured to the top at one time, it should be poured in layers, and stop for about 2 hours for each 2m height, and at the same time pay attention to the fact that before the initial setting, after the lower layer of concrete completes most of the plastic settlement, a layer of concrete can be poured to avoid settlement cracks." The pen "fun" pavilion www.biquge.info secondary vibration before the initial setting of concrete is also a good way to avoid settlement cracks. For the reserved holes, embedded parts and steel bars are relatively dense and difficult to pour and easy to defect parts, construction technical measures should be formulated in advance to ensure that the concrete is poured smoothly and vibrated and compacted; ”

"Concrete pouring should be carried out continuously, when it is necessary to intermittently, the concrete pouring interval time between its areas and between the upper and lower layers should be shortened as much as possible, and should be covered and poured before the initial setting of the previous layer of concrete; Party B's running pipe mortar only plays the role of moistening the pipe, and it is strictly forbidden to use it as concrete and pour it into the structural part. ”

"When pouring concrete of different strength grades alternately, Party A must ensure that the concrete of different grades is poured to the correct part to avoid serious quality problems or waste caused by wrong beating, and Party A shall be responsible for the quality and economic losses caused by this. In the process of pouring concrete in the event of force majeure accidents, Party A should actively cooperate with Party B to deal with the accident in order to resume production work in time. ”

Jin Xiaoya nodded and said: "I didn't expect that there is so much attention to pouring concrete, it seems that I will come to the construction site to inspect more in the future, so as not to have problems, and it will be troublesome when the time comes." ”

Li Ruoyu said with a smile: "Mr. Jin only needs to strengthen management, these project departments and supervision units will be responsible, as the owner unit, you bear the responsibility of supervising them, but I hope that we will cooperate more closely, so that there will be no fearless losses." Next, I will talk about the handling of emergencies. ”

"First, the on-site pipe blockage, my company's on-site pumper notified the station dispatcher to stop the material for the first time, and the on-site dispatcher organized the plumber to remove the blockage in a timely manner, and the tower crane at the construction site should actively cooperate to restore pumping in the shortest possible time. The second is the slump abnormality, the slump range of our company's concrete to the site is 120-160mm, the construction site can be based on the pouring site to our company's requirements, but if the site concrete waiting time is longer, the concrete slump will lose more, such as the slump loss is larger, the site dispatch can take the addition of two water reducer and water in a ratio of 1:5 to improve the workability to achieve pumping performance, it is strictly forbidden to add raw water without permission. Our company's on-site dispatch or pump union will reflect this situation to the workshop dispatching room in time for timely adjustment. ”

"Another is the site waiting too long, such as the site of mold explosion, power outage and other reasons caused by concrete waiting for more than 2 hours, our company's on-site dispatch will be in time with the dispatch to contact the concrete to transfer to other sites in a timely manner, such as the inability to process the concrete resulting in waste of concrete must be compensated by the construction unit for the loss of concrete. In addition, in case of traffic jams, our company's front field scheduling will communicate with the construction project in a timely manner, slow down the pouring speed to ensure that the pipe is not blocked, and at the same time, the on-site scheduling will reflect this situation to the station scheduling in a timely manner, and the scheduling will reasonably adjust the transportation capacity to ensure the continuous supply of concrete. ”

"Finally, the pump machine failure, such as the pump failure in the pouring process, the pump operator will notify our company repairman to repair in time for the first time, if the maintenance time is more than 2 hours, our company will replace the pump in time, if there is no equipment to replace the on-site dispatch will negotiate with your constructor in time to stop the pouring, and at the same time do a good job of technical treatment, and re-pouring after the equipment is in place. If these unexpected things happen, I hope that everyone can understand each other and support each other, after all, this is related to the quality of the project, and no one wants quality problems. ”

Jin Xiaoya nodded and said, "That's certain, I hope everyone will cooperate happily!"

Li Ruoyu said: "Let me say again, about the early maintenance after concrete pouring, our commercial concrete is different from on-site self-mixed concrete, in order to effectively control the plastic settlement and plastic shrinkage cracks of ready-mixed concrete, after concrete pouring to before the final setting, measures should be taken to strengthen the early care of concrete; when the concrete strength does not reach 1.2 megapascals, it is not allowed to step on or install formwork supports, or place heavy objects such as steel bars. ”

"When pouring and vibrating concrete, it should be noted that the amount of commercial concrete cementitious material is larger, the slump is larger, and the concrete has good fluidity and is easy to compact, so there is no need for strong vibration when pouring, and the vibration time should be 10 seconds -20 seconds, which can eliminate the bubbles in the concrete. In particular, the slump of pumped concrete is about 140 mm, and it cannot be over-vibrate, otherwise there is more floating slurry on the concrete surface and it is easy to produce shrinkage cracks. When pouring the wall or column, it should be compacted every 30cm thick concrete vibrating once, and the vibrating rod can not be placed in the column for long-term vibration, so as not to affect the appearance of the wall and column due to over-vibration and concrete leakage and water leakage. If the slurry layer is thick after vibrating, a layer of clean gravel can be sprinkled on the surface before the initial setting of the concrete, and then compacted and smoothed. After the ready-mixed concrete is poured and vibrate, it should be separated from 30 minutes to 3 hours, and the second reactivation should be carried out, and the column wall of the vertical structure and the deep beam of the horizontal structure should be strengthened in particular; ”

"After the concrete is poured, before the final setting of the concrete and no later than 12 hours, it is necessary to cover the film or spray the curing liquid; when the construction environment temperature is high, the humidity is low, the wind speed is high and the temperature changes suddenly, it should be immediately covered with thin mold and other moisturizing to prevent water loss and shrinkage. When plastic settlement cracks and plastic shrinkage cracks appear on the surface of concrete before final setting, secondary or multiple compaction and plastering should be carried out in time, and the concrete plastic cracks should be trimmed before the final setting of concrete. ”

"Curing and demoulding, timely and good curing have a very significant impact on the quality of concrete, which is enough to make the strength of concrete normal and good growth, and can reduce the shrinkage of concrete and reduce the probability of cracks. Therefore, the concrete components must be covered and watered immediately after the final setting of the concrete. Especially in high temperature, dry, windy and other weather, the water on the surface of the concrete evaporates very quickly, if not enough water is not replenished in time, it is easy to cause cracking due to surface water loss and contraction, and in serious cases, it will penetrate the entire floor slab, resulting in leakage. Timely implementation of the measures specified in the construction code can prevent the occurrence of this phenomenon. I hope that the comrades of the construction unit must pay attention to it, because this is related to the safety of thousands of ordinary people, their lives and property, and at the same time, if there is a quality problem, causing complaints from buyers, this is also a kind of damage to the image of the developer!" )