1) Careful design, strict control o

1) Careful design, strict control of the concrete mix ratio, regular inspection, accurate measurement, uniform mixing of the concrete, and proper slump; concrete treatment should be set with chord or chute height exceeding 2 meters; pouring should be layered, and should be used The superimposition method stimulates gravity to prevent leakage; the joints of the pouring formwork should be tightened, and the formwork support should be checked when pouring the formwork to prevent the thick liquid from leaking; the pouring foundation, column and wall roots should be poured in the upper part of the lower part for 1-1.5 hours; intermittent after pouring Pour concrete to avoid "rotten neck". (2) The concrete mixing time should be appropriate, generally 1-2 minutes. (3) When the height of the three concretes exceeds 2 meters, measures should be taken, such as using rope tubes, elephant trunks or vibrating elephant trunks for delicious entertainment. (4) After the concrete enters the mold, the vibration time should be controlled. Generally, the vibration time per point is about 20-30 seconds.