| Summary: | 碩士 === 國立屏東科技大學 === 土木工程系所 === 99 === PVC waterstops is the important element placed between construction
and expansion joints of concrete slabs for preventing the leakage of
subsurface structures.
Teflon coated thermostatic electric iron is commonly used for PVC
waterstops welding in the European countries and United States of American.
In addition, hog rings are also used to fasten waterstops on the adjacent steel
bars for preventing the dislocation of PVC waterstops during concrete pouring
stage.
These construction techniques are recommended to be used in Taiwan.
Water source, water path, and seepage water pressure are the three important
items to cause leakage at subsurface concrete joints. To eliminate any one of
these items for subsurface structures would prevent leakage. Therefore,
designing waterstops welding at higher location, adding silicon gel around
welding location, and placing expanded polyethylene geofoam at expansion
joints would reduce the potential of leakage near PVC waterstops.
Moreover, waterstops specifications, construction guidance, and test
standards should be updated by government agencies in the near future.
IV
Polyethylene and thermoplastic vulcanized (TPV) waterstops are
recommended to be used for drinking water and chemical storage facilities.
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