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Why underground waterproofing membrane waterproofing should be used outside the practice?

The membrane waterproof layer paste in the underground engineering structure of the water surface is usually called the outer waterproof, affixed to the back surface of the water. Outer membrane waterproofing can protect the main structure of underground engineering from the harmful effects of groundwater; waterproof layer can be compacted with earth pressure, and with the load-bearing structure to resist the pressure of groundwater infiltration. And the internal waterproofing method can not protect the main structure, and must also set up a set of lining structure to compress the waterproof layer to resist the pressure of groundwater infiltration, and sometimes even need to set anchor bolt waterproof layer and supporting structure into a whole. Therefore, the general construction of the underground excavation are not used within the waterproofing practices, but the underground construction of underground excavation, the membrane must be waterproof and can not be used outside the waterproofing practices, the use of internal waterproofing practices.

 
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