拉森钢板桩那些事儿

在河北地区的拉森钢板桩定额计价中，土壤级别的关系到施工难度、机械选型以及最终的工程造价。

以下为梳理出的甲级土与乙级土的区别、常规工艺规格以及造价影响因素：

一、甲级土与乙级土的区别

在打桩工程中，土壤级别主要根据机械沉桩的难易程度来划分：

甲级土（较易打入）：

这类土质较软，打桩阻力小，施工速度快，机械损耗低。

乙级土（较难打入）：

土壤中夹有较薄的细砂层，桩经机械作用较易沉入（相比甲级土阻力更大）。

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核心影响：

在河北地区（如石家庄周边），如果地勘报告显示为乙级土，打桩时的振动锤或液压打桩机需要更大的功率，单根桩的沉桩时间会延长，导致机械台班费和人工费增加。如果土层中夹有较厚的粗砂、卵石甚至硬岩（丙级土），则可能需要增加“引孔”工序，造价会进一步大幅上升。

总结：河北定额子目的综合单价与土壤类别（甲级丙类）成正比

二、常规工艺与规格（以 FSP-IV 型为例）

1.常见规格：

FSP-IV 型（4号桩）目前应用最广的型号，截面尺寸：

宽 400mm × 高 170mm × 厚 15.5mm，

理论重量 76.1 kg/m，

常见定尺长度为 9米、12米和 15米。

2.标准工艺流程：

施工准备及定位放线 → 开挖沟槽并安装导向架 → 施打钢板桩（锁口涂抹黄油润滑） → 基坑开挖与围檩支撑安装 → 主体结构施工 → 分层回填 → 振动拔桩 → 拔桩后孔隙注浆或砂土回填处理。