建筑翻译高手请进:open drain;cover drain;open drain with grating cover;cover drain with MS grating碰到份图纸,有点糊涂,请高手解疑,先看下面几种drain.1、300mm wide open drain2、300mm wide cover drain3、300mm wide open drain

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建筑翻译高手请进:open drain;cover drain;open drain with grating cover;cover drain with MS grating碰到份图纸,有点糊涂,请高手解疑,先看下面几种drain.1、300mm wide open drain2、300mm wide cover drain3、300mm wide open drain
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建筑翻译高手请进:open drain;cover drain;open drain with grating cover;cover drain with MS grating碰到份图纸,有点糊涂,请高手解疑,先看下面几种drain.1、300mm wide open drain2、300mm wide cover drain3、300mm wide open drain
建筑翻译高手请进:open drain;cover drain;open drain with grating cover;cover drain with MS grating
碰到份图纸,有点糊涂,请高手解疑,先看下面几种drain.
1、300mm wide open drain
2、300mm wide cover drain
3、300mm wide open drain with grating cover
4、300mm wide HD grating hinged cover drain
5、300mm wide cover drain with MS grating.
请先解释一下以上各种drain的定义和区别.
然后回答我的问题:1、open drain顶部是空的还是有grating的?
2、cover drain指的是顶部混凝土的吗,如果是,和box drain有什么区别?
3以上列出的3和5都是with grating,为什么一个叫open一个叫cover?

建筑翻译高手请进:open drain;cover drain;open drain with grating cover;cover drain with MS grating碰到份图纸,有点糊涂,请高手解疑,先看下面几种drain.1、300mm wide open drain2、300mm wide cover drain3、300mm wide open drain
open drain 明渠
cover drain 暗渠
open drain with grating cover使用格栅盖的明渠
HD grating hinged cover drain HD格栅铰链盖的暗渠(HD不知道是什么缩写)
cover drain with MS grating MS格栅的暗渠
问题
1.open drain顶部可以是空的也可以有grating的
2.cover drain应指有顶部混凝土的,box drain可能在形状上是方形的,cover drain指包含渠在里还是在外部包括形状
3.排水通道如果从截面是U字形水可以直接从grating中流入的话就是open drain,类似于室外马路边上的排水;如果做成圆形或者其他形状,不能直接流入而是只通入水的话就是cover drain
ps:我不是做建筑排水的,但工科类的懂一些,以上是我的联想+猜测,自我感觉这种猜测八九不离十,