According to double radius method and edge bend method, this paper introduces the design theory of roll pass with opposite direction bend in middle part for cold forming of round pipe.
本文在双半径法和边缘弯曲法的基础上，介绍了一种冷弯圆管的中部反向弯曲孔型设计理论。
Based on a certain engineering project, the design and construction technology of double pipe and double liquid grouting method for leak blockade in deep excavation retaining structure are introduced.
在深基坑围护结构中采用双管双液法注浆工艺堵漏的设计及施工工艺，工程实践证明是成功的。
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