MPP 电力管非开挖拉管施工方案:管线避让与顶进

2025-08-18



MPP电力管非开挖拉管施工凭借对地表干扰小、施工效率高的优势,在城市电力管线敷设中应用广泛。其中,管线避让与顶进施工是保障工程安全与质量的核心环节,需通过科学规划与精准操作实现地下管线安全穿越。

管线避让:前期勘察与路径优化

管线避让的前提是全面掌握地下环境。施工前需联合勘察单位采用“物探+钻探”组合技术:通过地质雷达、管线探测仪等设备定位既有地下管线(如给水管、燃气管、通信光缆)的走向、埋深及材质,结合钻探获取精确地质数据,形成地下管线三维分布图。路径规划需遵循“安全距离优先”原则,与既有管线保持不小于1.5倍管径的水平净距,垂直净距不小于0.5米;若遇密集管线区,可采用“上跨”或“下穿”方案——当既有管线埋深较浅时,设计上抬轨迹(坡度≤15°),反之则下沉绕行,确保交叉处净距达标。对无法避让的重要管线,需设置防护套管(如CPVC管)或采用人工挖孔桩隔离,避免施工扰动。

顶进施工:导向控制与动态调整

顶进环节需以“精准导向、稳定推进”为目标。设备选型上,根据管径(常用Φ200-Φ630mm)和地质条件(黏土、砂土、岩石)选用水平定向钻机,配套导向仪(精度±20mm/30m)实时监测钻头轨迹。施工前需在地面布设导向基准线,输入设计轨迹参数(坡度、曲率半径),通过导向钻头内置的探头将位置数据传输至控制台,偏差超50mm时及时调整钻进角度。

泥浆护壁是顶进施工的关键辅助措施。针对砂土、卵石地层,采用膨润土泥浆(黏度30-50s)形成护壁膜,降低孔壁坍塌风险;黏土地层可适当降低泥浆黏度,减少阻力。顶进过程中需控制回拖力(≤管材屈服强度的80%),采用分级顶进模式:初始阶段(前50m)低速推进(1-2m/min),待轨迹稳定后逐步提速,避免管材因受力不均产生开裂。

动态监测与应急保障

为应对施工中的不确定性,需建立“地面+地下”双监测体系:地面布设沉降观测点(间距5-10m),监测地表沉降量(预警值≤30mm);地下采用分布式光纤传感器,实时监测既有管线的位移与应力变化。若发现管线偏移超10mm或沉降过快,立即启动应急预案:停止顶进,调整泥浆配比,必要时采用注浆加固(水泥-水玻璃双液浆)稳定地层。

此外,施工全程需做好安全防护:设置警示区隔离施工场地,配备地下管线应急抢修设备(如封堵器、备用管材),并与管线权属单位建立联动机制,确保突发情况快速响应。通过以上措施,可有效实现MPP电力管非开挖拉管施工中管线的安全避让与精准顶进,为城市电力基础设施建设提供可靠技术支撑。

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