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Key Construction Points for Compaction Sand Piles in Railway Subgrades

2016-04-28 726 0人评论

　　1．施工前应选择有代表性的地段进行工艺性试验，确定主要工艺参数，并报监理单位确从。
　　2．砂桩施工开始后应及时进行复合地基承载力试验，以确认设计参数。
　　3．砂料应采用含泥量不大于3%的中、粗砂。
　　4．挤密砂桩可采用单管法或双管法施t。施t前至少应做两根试桩。制桩工艺应能保证桩体连续、挤密均匀、桩径不小于设计尺寸、桩体密实程度达紧密状态。
　　5．应严格按照设计桩位、桩长、桩数施工，桩位偏差不应大于桩径之半，桩长允许偏差为-locm，垂直度偏差不应大于1.5%。
　　6．施工顺序应从两侧开始，逐渐向中间推进，或由外向内环绕打设。
　　7．砂桩打完后必须检验合格才可填筑排水砂垫层。

Key Points for Construction of Gravel Piles in Railway Subgrades

Key Construction Points for Sand Piles in Railway Subgrade Using the Casing Method (Sunk Pipe Method)

Key Construction Points for Compaction Sand Piles in Railway Subgrades

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Key Construction Points for Compaction Sand Piles in Railway Subgrades

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