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球磨铸铁管4——优缺点(精华)

发布时间:2021-03-10 00:27 | 编辑:球磨铸铁管优缺点 | 35 次浏览
球磨铸铁管优缺点

优点:

在中低压管网,球墨铸铁管具有运行安全可靠,破损率低,施工维修方便、快捷,防腐性能优异等。




缺点:

在高压管网,一般不使用,抗压力低。由于管体相对笨重,安装时必须动用机械。打压测试后出现漏水,必须把所有管道全部挖出,把管道吊起至能放进卡箍的高度,安装上卡箍阻止漏水。



        1、沟槽开挖

         沟槽底宽应按下式计:B=D1+2(b1+b2)

        式中:B-管道沟槽底部的开挖宽度(mm) D1-管道结构的外缘宽度(mm) b1-管道一侧的工作面宽度(mm) b2-管道一侧的支撑宽度(mm)。

         2、沟槽支撑

         根据沟槽土质、地下水、开槽断面、荷载条件等因素进行设计,要求牢固可靠,防止塌方、支撑不得妨碍下管和稳管。

         3、 T型接口管道在垂直或水平方向转弯处应设支墩。应根据管径、转角、工作压力等因素经计算确定尺寸。

         4、输送生活饮用水时,管道不应穿过毒物污染区,如必须穿过时应采取防护措施。

       5、凡承插连接的球墨铸铁管线,必须经计算设支墩,参见国家建筑标 准设计图集03SS505《柔性接口给水管道支墩》。

         6、球墨铸铁管的外防腐蚀涂层应根据敷管地的土质情况来选择镀锌和环氧沥青涂层或更高要求的涂层。

         7、 管道安装完、试压合格后,宜用低氯离子水冲洗和0.03%高锰酸


1. Trench excavation
    The bottom width of trench shall be calculated as follows: B = D1 + 2 (B1 + B2)
Where: B - excavation width at the bottom of pipe trench (mm), D1 - outer edge width of pipe structure (mm), B1 - working face width at one side of pipe (mm), B2 - support width at one side of pipe (mm).
2. Trench support
    The design shall be carried out according to the soil quality, groundwater, slotting section, loading conditions and other factors of the trench. It is required to be firm and reliable, and the collapse prevention and support shall not hinder the pipe laying and pipe stabilization.
3. Buttress shall be set at the turning point of T-joint pipeline in vertical or horizontal direction.      The size of buttress should be determined by calculation according to pipe diameter, angle, working pressure and other factors.
4. When transporting drinking water,

     the pipeline should not pass through the poison contaminated area. If it must pass through, protective measures should be taken.
5. All socket connected ductile iron pipelines must be provided with buttresses after calculation. Please refer to the national building standard design atlas 03ss505 "buttresses for flexible joint water supply pipeline".
6. The external anti-corrosion coating of ductile iron pipe shall be galvanized and epoxy asphalt coating or higher coating according to the soil conditions of pipe laying place.
7. After pipeline installation and pressure test, low chloride water and 0.03% permanganate should be used for flushing


山西悦瀚球墨铸管,专业生产厂家,DN80-2600产品种类齐全,价格实惠,欢迎新老顾客来电咨询,全国项目总监电话:138-3563-1999


          产品种类:球墨铸铁管DN80-2600 \ 球墨井盖 \ 球墨胶圈 \ W柔性管 \ 抢修节 \


网址:http://www.fujimechanic-cs.com/


     

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