塑料检查井承口密封问题是衡量井性能优劣的重要指标，也是工程通过验收闭水试验的关键，因此密封问题被施工方和厂家特别看重。检查井与管道连接的每个地方都存在泄漏问题，可以分为：井坐承口连接、井筒承口连接两类。
The sealing problem of plastic inspection wells is an important index to measure the performance of wells, and it is also the key to pass the acceptance of closed water test. Therefore, the sealing problem is particularly valued by the constructors and manufacturers. There are leakage problems in every place where the inspection wells and pipelines are connected, which can be divided into two categories: wellbore bearing connection and wellbore bearing connection.
塑料检查井与塑料排水管采用橡胶圈和热收缩套连接，可以较好地解决承口密封闭水的问题，但是目前市场上埋地塑料排水管有PVC-U外径系列的波纹管，PVC-U内径系列的波纹管，PVC-U内径系列加筋管，HDPE外径系列的波纹管，HDPE内径系列的波纹管，HDPE中空壁缠绕管，以及HDPE钢带缠绕管等等，相同公称直径的埋地塑料排水管，只要生产厂家不同，或管材类型不同，或环刚度不同，他们的外径尺寸都不相同，在塑料排水管与塑料检查井的施工安装时，管材外径尺寸的不标准、不统一会产生连接不紧密问题。
Plastic inspection wells are connected with plastic drain pipes by rubber rings and heat shrinkable sleeves, which can better solve the problem of sealing water at sockets. But at present, buried plastic drain pipes on the market include corrugated pipes of PVC-U outer diameter series, corrugated pipes of PVC-U inner diameter series, reinforced pipes of PVC-U inner diameter series, corrugated pipes of HDPE outer diameter series, corrugated pipes of HDPE inner diameter series, hollow wall winding pipes of HDPE. As well as HDPE steel band winding pipe and so on, the same nominal diameter of buried plastic drain pipe, as long as the manufacturer is different, or the pipe type is different, or the ring stiffness is different, their outer diameter size is different. In the construction and installation of plastic drain pipe and plastic inspection well, the non-standard and non-uniform outer diameter size of the pipe will cause the problem of not close connection.
塑料检查井座是用模具标准化定制生产的。因此在塑料检查井的安装时，塑料排水管材外径尺寸的不标准、不统一，给塑料检查井的推广和应用带来了很大的困扰。
Plastic inspection wellbore is produced by standardization and customization of moulds. Therefore, in the installation of plastic inspection wells, the size of plastic drainage pipe is not standard and uniform, which brings great trouble to the popularization and application of plastic inspection wells.
如何保证塑料检查井座的承口与各种类型埋地塑料排水管能够连接以及尺寸的匹配，是保证塑料检查井并体密封闭水的一个很重要的前提。
How to ensure that the socket of the plastic inspection wellbore can be connected with various types of buried plastic drainage pipes and the size matching is a very important prerequisite to ensure that the plastic inspection wells are sealed and closed together.
塑料检查井连接排水管在北方一般情况下连接的都是双壁波纹管，但是由于各个生产厂家生产的波纹管波峰有的高，有的低，低的波峰用密封圈连接之后很容易漏水，只能更换加厚的密封圈，建议经销商货施工方在施工之前一定要了解波纹管的详细外径是多少，然后我们在根据波峰的高度来判断用什么样的密封圈。
Plastic inspection wells connected with drainage pipes are usually double-wall corrugated pipes in the north, but because the corrugated pipes produced by various manufacturers have some high, some low www.biaozhigan.net.cnwww.diandongmenc.cnwww.fenshaolu.net.cnwww.fenshaolu.org.cnand low www.zjkdiandongmen.cnwww.xinhaodenggan.cnpeaks which are easily leaked after being connected with sealing rings, only thicker sealing rings can be replaced. It is suggested that distributors and cargo builders should know the detailed outer diameter of corrugated pipes before construction. Then we can judge what kind of sealing ring to use according to the height of the wave crest.