成年免费三级视频

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    The use of concrete mixers

    The use of concrete mixers

    The use of concrete mixer must be strictly abide by the "construction machinery safety technical regulations", before use must carefully check the power equipment, work agencies and supporting the use of lifting, transport pouring equipment.

    Start and feed of the concrete mixer: The mixer must be loaded without load and be fed during operation, otherwise the machine will be damaged due to excessive starting torque. Mixer mixing concrete, must be in accordance with the provisions of the ratio of ingredients and water-cement ratio of the amount of feed should be measured in advance the thickness of coarse aggregate, and the theoretical mix ratio conversion into the construction ratio, and then according to the construction ratio and mixer discharge The capacity is calculated for the quality of each component to be added. Feed calculated value should be tested, once determined to strictly enforce the maximum aggregate size should meet the requirements, forced mixer on the maximum aggregate size requirements more stringent, otherwise it will produce card material. If the added material changes or due to rain, snow and other causes of humidity changes, should be re-measured, recalculate and determine the amount of feed. Important concrete structures, toll ratio and water-cement ratio should be checked every 4 hours.

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    成年免费三级视频
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