大直径盾构砂卵石地层掘进消耗量分析及经济测算研究

Analysis of Excavation Consumption and Economic Evaluation of Large Diameter Shield Tunneling in Sand and Gravel Strata

在大直径盾构项目中,准确合理地测算出工程投资是项目顺利推进的关键。文章以杭州富阳秦望隧道盾构掘进施工项目为研究对象,采用15 m级大直径泥水平衡盾构施工,主要穿越软土和砂卵石地层。目前浙江省已出台大盾构定额方案,但是已有的盾构定额及计价原则仅适用于软土地层,因此直接使用现有定额规范会导致工程造价偏差,影响工程进度。通过分析秦望隧道收集的盾构掘进数据,对掘进区域的砂卵石地质进行分级,统计各分级中的人工、主要材料、机械台班消耗量。依据各分级下的消耗量,测算相应的盾构掘进定额基价。将测算的定额基价与现有定额对比,根据现场施工实际,验证了所提出的分级和定额方案的合理性。

In large-diameter shield tunneling projects,accurately and reasonably calculating the project investment is crucial for the smooth progress of the project.This study focuses on the construction project of Hangzhou Fuyang Qinwang Tunnel using a 15m-class large-diameter slurry balance shield tunneling method,mainly crossing soft soil and sand-gravel strata.Currently,Zhejiang Province has issued standard schemes for large shield tunneling;however,the existing standards and pricing principles are only applicable to soft soil strata.Therefore,directly using the existing standards would result in cost deviations and affect the project schedule.By analyzing the shield tunneling data collected from the Qinwang Tunnel project,the geological conditions of the sand-gravel strata in the excavation area are classified,and the consumption quantities of labor,major materials,and machinery are calculated for each classification.Based on the consumption quantities for each classification,the corresponding shield tunneling standard rates are calculated.A comparison between the calculated standard rates and the existing standards,as well as on-site construction practices,validates the rationality of the proposed classification and standard scheme.