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11、ation, bring added 159 in non public enterprises, individually-1540, created a涵洞轻型井点降水施工方案工程名称：龙九路油田道路改造工程编 制：审 核：大庆油田路桥工程有限责任公司第五工程处2013年4月26日- 14 -目 录1概述- 1 -1.1 编制依据- 1 -1.2 盖板涵工程概况- 1 -1.3 水文地质情况- 1 -1.4 工期计划- 2 -2轻型井点降水法施工- 2 -2.1 方案比选- 2 -2.2 工作原理- 2 -2.3 轻型井点降水设计- 3 -2.3.1、井点管的埋设深度- 4 -2.3.2、
12、需井点管数量- 4 -2.3.3、基坑涌水量计算- 3 -2.3.4、抽水设备选用- 5 -2.4 降水井施工工艺- 5 -2.5 轻型井点施工- 5 -2.5.1施工准备- 5 -2.5.2、井点安装- 6 -2.5.3、抽水- 8 -3 质量标准及质量保证措施- 9 -3.1 质量标准- 9 -3.2 质量保证措施- 10 -4 危险点分析- 11 -4.1 电源线老化漏电伤人。- 11 -4.2塌方- 11 -4.3机械伤害- 11 -4.4高处坠落- 11 -5安全生产及文明施工措施- 11 -6环保措施- 12 -1概述1.1 编制依据1.1.1.施工现场踏勘获得的资料1.1.2.图
13、纸路-121611.1.3.龙九路施工组织设计1.2 盖板涵工程概况 龙九路是让胡路区地区区域路网东西方向的主要交通干道。属于城市中心区交通密集路段、修建路段起子创业大道与龙九路交界处，途径世纪家园、龙南公安分局、景园中学、西寨小区等终至中央大街；长2.786km。 本工程设有涵洞加长5道，共56米。具体位置为：K2+608、K2+698,K2+712,K3+706,K3+716。由于地下水位高，因此在基坑开挖前需要对以上五道涵都进行井点降水。1.3 水文地质情况 该线路位于的地表局部分布有素填土，其下分布淤泥质粉质黏土、粉质黏土、黏土、粉砂，承载力由90kPa210kPa不等。本涵基底位于粉
14、质粘土层上，地基容许承载力180kPa，该地区地下水比较丰富，加大了施工的难度，因此采用轻型井点降水法施工。1.4 工期计划本盖板涵井点降水工程开工、完工时间以满足工期要求为准。分两阶段降水，第一阶段2013.5.15-2013.5.25 第二阶段2013.5.28-2013.6.12轻型井点降水法施工2.1 方案比选方案一 真空预压和堆载预压处理方案真空预压和堆载预压适合处理软土地基，但工期一般在1个月以上，而且经过真空预压和堆载预压处理的地基承载力一般不超过12t/m2。地基承载力要求1520t,因此真空预压和堆载预压无法满足本工程的设计要求。方案二 抛石积淤法本工程吹填区吹填厚度在2.0
15、3.0m左右，要想上车强夯，需要抛2.0m厚左右的山石。每平方米增加造价，造价昂贵。方案三 化学（注浆）加固法高压旋喷注浆法2m深的钻孔每孔费用造价也较高；另外对表层无法加固。所以此法也被弃用。方案四 轻型井点降水法高真空击密法处理软土地基一个周期一般在1天至2天，比真空预压缩短工期接近2/3。经过轻型井点降水法工期短，造价低，相对于化学法和抛石挤淤法节省造价一半。经过比选，认为轻型井点降水法。2.2 工作原理在基础工程施工中经常会遇到地下水的问题，基坑面积大，深度大时更为棘手，如果施工措施不当，就会造成不同程度的经济损失和人员伤亡，这种情况屡见不鲜。轻型井点是沿基坑四周每隔一定距离埋入井点管（直径30-50MM，长5-7M的塑料管）至蓄水层内，利用抽水设备将地下水从井点管内不停抽出，使原有地下水降至坑底以下。在施工过程中要不断的抽水，直至施工完毕。2.3 轻型井点降水设计2.3.3、基坑涌水量计算按无压非完整井环形点系统,基坑远离边界时涌水量计算公式进行计算:Q=1.366*K*(H2-(H+h)/2)2/lg(1+R/r0)+(H+h/2-L)*L*lg(1+0.2(H+h/2)/r0)K：渗透系数，经实测K=8m/d
