本文目录一览:
- 1、什么是跌水井?
- 2、跌水井是什么
- 3、跌水井的设置原则
- 4、什么是阶梯式跌水井
什么是跌水井?
跌水井是设有消能设施的窨井,它可以克服水流跌落时产生的巨大冲击力。
如果没有跌水井,当水管下坡时,水流很快,冲击力很大,长时间会把水管冲刷坏的。
跌水井主要用于跌落水头超过Im时的分界处。管道由于地形高差相差大,或支线接人埋设较深的主干线时出现较大的跌落水头。
跌水井是什么
跌水井是在井内水流产生跌落的井。在排水管道中由于管道落差较大,按正常管道坡度无法满足设计要求时,采取做一个内部管道有落差的检查井来满足设计方案。
排水管道中由于管道落差较大,按正常管道坡度无法满足设计要求时,采取做一个内部管道有落差的检查井来满足设计方案,因为在井内水流产生跌落故此这样的井称为跌水井。
同普通窨井相比,跌水井需消除跌水的能量,这一能量的大小决定于水流的流量和跌落的高度。跌水井的构造有不同的设计,决定于消能的措施,其井底构造一般都比普通窨井坚固。
扩展资料
排水管渠和附属构筑物的一般规定
1、排水管渠系统应根据城镇总体规划和建设情况统一布置,分期建设。排水管渠断面尺寸应按远期规划的更高日更高时设计流量设计,按现状水量复核,并考虑城镇远景发展的需要。
2、管渠平面位置和高程,应根据地形、土质、地下水位、道路情况、原有的和规划的地下设施、施工条件以及养护管理方便等因素综合考虑确定。排水干管应布置在排水区域内地势较低或便于雨污水汇集的地带。
3、排水管宜沿城镇道路敷设,并与道路中心线平行,宜设在快车道以外。截流干管宜沿受纳水体岸边布置。管渠高程设计除考虑地形坡度外,还应考虑与其他地下设施的关系以及接户管的连接方便。
4、管渠材质、管渠构造、管渠基础、管道接口,应根据排水水质、水温、冰冻情况、断面尺寸、管内外所受压力、土质、地下水位、地下水侵蚀性、施工条件及对养护工具的适应性等因素进行选择与设计。
5、排水管渠的断面形状应符合下列要求
排水管渠的断面形状应根据设计流量、埋设深度、工程环境条件,同时结合当地施工、制管技术水平和经济、养护管理要求综合确定,宜优先选用成品管。大型和特大型管渠的断面应方便维修、养护和管理。
参考资料来源:百度百科-跌水井
跌水井的设置原则
参见《室外排水设计规范(2011年版)》GB 50014-2006。
管道跌水水头为1.0—2.0m时,宜设跌水井;跌水水头大于2.0m时,应设跌水井;一般跌水水头不大于6米。管道转弯处不宜设跌水井。
跌水井的进水管径不大于200mm时,一次跌水水头高度不得大于6m;管径为300—600mm时,一次跌水水头不宜大于4m。跌水方式一般可采用竖管或矩形竖槽。管径大于600mm时,其一次跌水水头高度及跌水方式应按水力计算确定。
什么是阶梯式跌水井
在排水工程中,当雨水管上下游跌水差≥1m时,污水管上下游差≥50cm时必须使用跌水井,它有三种形式:竖管式跌水井,其跌水处采用管道,见下图
当跌水处采用竖式槽沟时,即为竖槽式跌水井:见下图:
而跌水处采用阶梯时,则为阶梯式跌水井,它可砖砌,见下图:
也可采用混凝土的阶梯式跌水井,见下图:
跌水井的跌差高度、进出口管径、井室参数均应根据工程的工艺要求决定,其结构详见排水检查井图集:
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