Based on the engineering practice, this paper introduced constructional technique and quality assurance measures of big bore hole digging and pouring with expansion pile head.

通过工程实例，介绍大孔径扩大桩头人工挖孔灌注桩的施工方法及质量保证措施。

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Using planetary gear reducer insteads of worm and worm wheel reducer in the pouring mechanism of melting cast iron pot. It had been used in practice and got its economic result.

用小型行星减速机构代替蜗轮蜗杆减速传动装置，为铸造厂铁水包倾倒机构解决了一项生产难题，在生产中取得效益。

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