导管已提升很高,导管底口埋入混凝土接近1m.但是灌注在导管中的混凝土仍不能涌翻上来。
原因分析
(1)由于各种原因使混凝土离析,粗骨料集中而造成导管堵塞。
(2)由于灌注时间持续过长,最初灌注的混凝土已初凝,增大了管内混凝土下落的阻力,使混凝土堵管。
治理方法
灌注开始不久发生堵管时,可用长杆冲、捣或用振动器振动导管。若无效果,拔出导管,用空气吸泥机或抓斗将已灌入孔底的混凝土清除,换新导管,准备足够量的混凝土,重新灌注。
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