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  • ahmed
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      August 8, 2007 at 8:52 am #2891
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      this is the problem i faced while doin a box girder in oman,four among the 39 air vents provided were damaged
      all the four damaged were the bottom most cables in the web ,so access for driling from top was not possible,also void formers (polystrene) filled in the box prevented the entry into tthe box for puncturing a hole in there

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      Posts: 66
        August 11, 2007 at 4:02 pm #3143
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        Just guessing,
        Did you drill from the side? Knowing the height of the supporting bar (chair) and diameter of the duct you pretty much have exact location for drilling

        I Just wonder what if that was a web in the middle (between boxes)?

        ahmed
        Participant
        Posts: 31
          August 12, 2007 at 9:37 am #3144
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          as said earlier there was polystrene void formers inside the box so it was not possible to drill from inside so finally we decided to go for a vaccum pump for grouting

          AnonymousPosts: 49
            August 28, 2007 at 4:08 am #3151

            This is the correct thing to do. No worries. Be carefull as the vaccum grouting requires different viscosity of the grout.