Technical and economic comparison for different types of hanging board method of pile sheet wall
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摘要:
桩板墙是边坡和滑坡治理工程中常用的支挡结构形式，不同类型的挂板方式在结构受力、经济效益和环境保护等方面有显著差异。针对西部山区城市土地开发过程中的工程滑坡治理问题，基于技术经济比选阐明了桩板墙挂板类型和适用性。以兰雅星河湾项目为依托，分析了该滑坡的变形特征和治理工程总体设计，重点对桩板墙挂板方式优化比选进行详细阐述。
Abstract:Pile sheet wall is a common retaining structure in slope and landslide treatment engineering. There are significant differences in structural stress, economic benefits and environmental protection between different types of hanging plate. In view of the landslide treatment project in the process of land opening in western mountainous areas, the types and applicability of pile sheet wall hanging plate are expounded based on technical and economic comparison. Based on Lanya Xinghewan project, this paper analyzes the deformation characteristics of the landslide and the overall design of the treatment project, focusing on the optimization comparison and selection of pile sheet wall hanging plate methods.
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Key words:
- slope; landslide /
- pile sheet wall /
- hanging board method /
- optimization
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表 1 桩板墙类型及适用条件
Table 1. Types and applicable conditions of sheet pile wall
类型 挂板特征 工程效果 适用条件 桩后挂板 （1）挡土板置于桩背；（2）挡土板长度=桩净间距+搭接长度
（3）挖方边坡中，土体开挖量过大，且开挖土体位于墙背及
上部边坡坡脚，易引起山体扰动桩与桩之间空隙较大，影响道路美观 多用于填方边坡 桩前挂板 （1）挡土板置于桩前；（2）挡土板长度可整板浇筑而成，
预留相应伸缩缝；（3）土体开挖量不大，对山体扰动少需将桩体本身用素混凝土浇筑平顺，以图美观 多用于挖方边坡 桩间挂板 （1）挡土板置于桩间；（2）挡土板长度=桩净间距；
（3）土体开挖量介于桩后与桩前挂板之间，
可引起小范围溜塌需将桩间挡土板端头间空隙用素混凝土浇筑平顺，以图美观 多用于填、挖方边坡 斜插板 （1）挂板以一定的角度斜插于桩之间，夹角布置；
（2）桩与板的连接有多种形式，可通过预埋钢筋连接
或在桩上设置斜托或设置支撑块固定桩顶可设置植生槽种植藤蔓、垂吊植物，以提高桩板墙整体绿化效果 多用于绿化要求高的填、挖方边坡 
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表 2 桩间挂板工程量及直接工程费表
Table 2. Analysis of quantities and direct engineering cost of hanging plate between piles
工程名称：兰雅星河湾住宅小区8#楼北侧滑坡治理工程 标段：未命名 项目编码 010101002003 项目名称 挖一般土方 工程量 799.5 m3 定额编号 定额名称 定额单位 数量 单价/元 合计/元 人工费 材料费 机械费 人工费 材料费 机械费 1-9 人工挖土方 四类土
深度 1.5 m以内m3 1.00 24.45 0.00 0.00 24.45 0.00 0.00 1-87 土方运输 运输距离
500~1000 mm3 1.00 6.11 0.00 16.14 6.11 0.00 16.14 小计 30.56 0.00 16.14 分项直接工程费合计/元 46.70 项目编码 010505003003 项目名称 现浇C30混凝土挡土板 工程量 327.06 m3 定额编号 定额名称 定额单位 数量 单价/元 合计/元 人工费 材料费 机械费 人工费 材料费 机械费 借3-357 现浇混凝土构件
挡土板 混凝土10 m3 0.10 922.91 3487.43 0.00 92.29 348.74 0.00 借3-358 现浇混凝土构件
挡土板 模板10 m2 0.59 214.27 215.11 90.08 125.95 126.44 52.95 小计 218.24 475.19 52.95 分项直接工程费合计/元 746.38 项目编码 010515001003 项目名称 现浇构件钢筋 工程量 59.24 t 定额编号 定额名称 定额单位 数量 单价/元 合计/元 人工费 材料费 机械费 人工费 材料费 机械费 5-4 现浇构件非预应力钢筋
螺纹钢Ⅱ级t 0.20 695.4 4318.45 116.61 139.10 863.84 23.33 5-5 现浇构件非预应力钢筋
螺纹钢Ⅲ级t 0.80 709.31 4506.67 116.61 567.42 3605.18 93.28 小计 706.53 4469.02 116.61 分项直接工程费合计/元 5292.16
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表 3 桩前挡板直接工程费增量分析
Table 3. Direct engineering cost increment analysis
序号 项目名称 增量 计算方式 单价 直接工程费/元 1 挖一般土方 −799.5 m3 / 46.70元/m3 −37336.65 2 增加现浇挡土板（C30砼量） 160.44 m3 125 m×13 m×0.3 m（总体积）−327.06 m3（原工程量） 746.38元/m3 119749.21 3 增加现浇钢筋（Φ22、14钢筋） 29.06 t 88.3 t（参考原设计）−59.24 t（原工程量） 5292.16元/t 153790.17 总计 236202.73
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