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混凝土坝的上游面,一般不设防渗层,但有时因施工中温度控制不好产生裂缝,或对上游面的抗侵蚀、防渗、抗裂和抗冻融性提出较高要求时,就要在整个大坝或部分上游面设置可靠的防渗层。目前国内外常使用沥青,环氧以及环氧玻璃丝布等材料防滲。今年我国首次使用橡胶粘贴法,使橡胶片粘贴成大面积的防渗膜,处理了某混凝土双曲拱坝上游面的裂缝。不论在技术上,还是在经济效益或施工条件等方面都具有独特的优点,值得推广使用。一、国外对防渗橡胶片的评价橡胶片防滲是六十年代兴起的防滲技术,近年来发展很迅速,广泛用于水利水电工程、地下工程、房屋建筑和环境保护等工程上。日本三星胶带株式会社归纳防滲橡胶
The upstream face of a concrete dam generally does not have an anti-seepage layer, but sometimes cracks are generated due to poor temperature control during construction or higher requirements are imposed on the upstream face to resist erosion, seepage, cracking and freezing-thawing resistance Reliable barrier should be provided throughout the dam or part of the upstream face. At home and abroad often use asphalt, epoxy and epoxy glass cloth and other materials seepage. This year for the first time in our country, the rubber paste method was used to make the rubber sheets stick to a large area impermeable membrane and deal with the cracks on the upstream face of a concrete double curvature arch dam. Both in technology, or in terms of economic efficiency or construction conditions have unique advantages, it is worth promoting the use of. I. Evaluation of Impermeable Rubber Sheet Abroad The impermeable rubber sheet is an anti-seepage technology rising in the 1960s and has been developed rapidly in recent years. It is widely used in such projects as water conservancy and hydropower engineering, underground engineering, housing construction and environmental protection. Japan Samsung Tape Co., Ltd. summarized the impermeable rubber