推荐回答（3个）
洗衣机放卫生间就一个下水管可以把洗衣机的下水管道延伸长点，直接接到同一下水管这就会导致洗衣机内的水排不出去。我看了很多朋友给出的答案，就是直接在下水管上加一个三通，这样确实是增加了一个可以插洗衣机排水管的下水口。
用三通接冷水管分出软管一端接个水龙头；和洗衣机软管上好螺丝对接好。一般洗衣机垫高10公分左右才好排水，为了保持卫生间干燥，可以在洗脸盘10公分以上开孔，如果是陶瓷用陶瓷水接口。冷水接口处加个三通，引出冷水管与洗衣机联接即可。（有时也配合安装恒温阀），用软管或波纹管引出，根据室内情况灵活布管（不锈钢波纹管较好，利于变形布置）。
上水角阀处加三通接洗衣机龙头，下水加斜三通，洗衣机加个底座以利排水。装修若已做好，就不用考虑管道改动了，简单在出水口加一个三通吧。角阀那边加一个活接三通，再用软管接个洗衣机龙头出来就可以了，下水口如果是75的管可以剧短点两条管塞进去刚刚好排水口也一样，购买一个合适的三通即可，把洗脸盆排水管和洗衣机排水管分别插入三通内即可。像这类的东西网上销售的品种规格很多，总有一款适合你的。
没关系，想再放置洗衣机绝对没问题，但必须是滚筒洗衣机，因为它的排水是泵出去的，这样的话用一根管插入洗手盆那个管内，本人原来的洗衣机就是这么做的丝毫不影响使用。在网上或者实体店里买一个一进二出的水龙头就能解决你的问题。但这有个小弊端就是同时放水时可能水量会减小。但总比开墙补救方便此。我个人认为还是可以接受的范围内。
卫生间的下水应该做两个，一个做在洗澡的花洒底下，另外一个坐在洗衣机的旁边，让洗衣机的水能够快速的排出去。
地排法是最常见的卫生间排水方式，通常排水管直接与下水道相连，排水速度较快，维修起来也比较方便，不过部分管道会裸露，需要用其他装饰物将管道包起来。
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