重载临时道路装配式混凝土面板设计及经济分析

Design and Economic Analysis of Concrete Prefabricated Panels for Heavy-Duty Temporary Roads

针对建筑施工场地临时道路低中等交通频次和大载重的设计特点,结合天津静海区某工程项目临时道路工程地质条件,根据JTGD 40—2011《公路水泥混凝土路面设计规范》进行道路面板设计,计算表明:20 cm厚度预制混凝土面板厚度可以满足车轮荷载和温度梯度变化疲劳极限强度,采用规范要求的构造配筋率即可满足混凝土面板收缩受阻产生的拉应力验算和起吊工况产生的底板拉应力验算。利用天津市道路工程定额计价系统,对比分析了相同厚度预制混凝土面板和现浇混凝土面板的施工综合单价,重复利用2次预制混凝土面板综合单价和现浇混凝土路面板持平;增加周转使用次数才能更好体现装配式混凝土道路面板成本节约、经济效益好的优点。

In view of the design characteristics of these temporary roads on construction sitesare low to medium traffic frequency and high load capacity.Based on the geological conditions of a temporary road project in Jinghai District,Tianjin,and in accordance with Specifications for Design of Highway Cement Concrete Pavements(JTG D40—2011),the road panel design was carried out.The calculation shows that the thickness of 20 cm prefabricated concrete panel can meet the fatigue limit strength of wheel load and temperature gradient chang⁃es.The structural reinforcement ratio required by the specifications can meet the tensile stress calculation caused by the shrinkage resistance of the concrete panel and the tensile stress calculation caused by the lifting condition of the bottom plate.Using the Tianjin road engineering quota pricing system,a comparative analysis was conducted on the comprehensive construction unit prices of concrete prefabricated panels with the same thickness and concrete cast-in-place panels.The comprehensive unit prices of reused concrete prefabricated panels were the same as those of concrete cast-in-place panels cast-in-place road panels,increasing the number of turnover usages can better reflect the advantages of cost savings and good economic benefits of pre⁃fabricated road panels.