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排水用检查井主要由哪些部分组成？

What are the main parts of the inspection well used for drainage?

排水用检查井主要由井盖、井盖座、井筒、井室等部分组成。井筒及井室壁设置有供维修人员上下的踏步；井室体设置有进出水支管接口；污水井的井座一般设置有供水汇流的流槽，便于污物排放顺畅；雨水井的井座一般设置有供管道中泥沙沉淀的沉泥室，方便后期清理维护。

The inspection well for drainage is mainly composed of manhole covers, manhole covers, wellbore and well chambers. The wall of the wellbore and well chamber is set up and down for the maintenance personnel; the wellbore body is provided with the interface of the water inlet and outlet; the well seat of the sewage well is usually set up with a flow sink to facilitate the smooth discharge of the dirt; the well seat in the well usually has a slime chamber for sediment deposition in the pipeline, which is convenient for the later period of cleaning and maintenance.

4.排水用检查井与“节水、环保”之间有什么关联？

4., what is the relationship between the inspection well and the "water saving and environmental protection"?

排水用检查井是城市地下排水系统中不可或缺的排水设施，其数量非常巨大。排水用检查井一般沿公用设施铺设，每20～40m距离就有一个检查井，而所有的雨水和污水均需在一个个检查井中汇流后再流出。城市中一条排水管线长度短则几百米，长则几十公里，其间检查井星罗棋布。据了解，经雨污分流改造工程后，仅成都市的排水用检查井就在3.5万套以上，全国的排水用检查井数量最少在1500万套以上。而检查井的密封性对节水和环保至关重要，密封性不好会带来严重后果：水资源大量流失；污水会渗入地下进而污染地下水，产生二次污染；雨水和地下水会渗入污水系统中造成污水处理成本大大增加。因此，每个排水用检查井均是一个节水源和防污染源。在水资源严重匮乏的今天，通过数量巨大的排水用检查井实现对雨水和污水的综合利用是非常重要的节水和环保途径。

The drainage well is an indispensable drainage facility in the urban underground drainage system, and its quantity is very huge. The inspection wells for drainage are generally laid along the public facilities, and there is an inspection well at a distance of 20 to 40m, and all the rainwater and sewage are required to flow out after the check of the well. A drainage pipeline in the city is short in length, hundreds of meters in length, and tens of kilometers in length. It is understood that after the reconstruction of the rain and sewage diversion project, only the Chengdu city's drainage inspection wells are more than 35 thousand sets, and the number of the inspection wells in the country is at least 15 million sets. The sealing property of the inspection well is very important for water saving and environmental protection. Poor sealing will bring serious consequences: water resources are lost in a large amount; sewage will infiltrate underground and pollute ground water to produce two pollution; rain and ground water will infiltrate into the sewage system, resulting in a great increase in the cost of sewage treatment. Therefore, each drainage well is a water saving source and a pollution prevention source. It is a very important way of water saving and environmental protection to realize the comprehensive utilization of rainwater and sewage through a large amount of drainage inspection wells in today's serious shortage of water resources.