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  1. ab21

    Tremie Method

    Ok thanks all
  2. ab21

    Tremie Method

    I did a skim read of that document, it seems to suggest slump of 400mm? Thats too high!
  3. ab21

    Tremie Method

    Ok, I was worried high slump could jeoparize the concrete or cause segregation? So you guys are saying using tremie method is ok even if we dont get to groundwater and the high slump could be achieved with other admixtures? Thanks
  4. ab21

    Tremie Method

    Hi, I was wondering if anyone has experience in concreting by tremie method. Weve been advised to use this in a location for piled foundations, if groundwater is encountered. Weve decided to use tremie regardless. Would there going to be any issues with using tremie if ground water is not...
  5. ab21

    Pole Foundation (Drilled Shaft)

    Thanks all, you have been very helpful
  6. ab21

    Pole Foundation (Drilled Shaft)

    The pole doesnt have any antennas or other equipment on it and I dont think the client cares about deflection since its not in their design requirements but I know 1.75m is a big number for deflection. The pole is a dead end structure so it will have sustained tension but the moment value I gave...
  7. ab21

    Pole Foundation (Drilled Shaft)

    I use 5% of pole height although I dont think the client cares much about deflection. Thanks
  8. ab21

    Pole Foundation (Drilled Shaft)

    Is deflection an issue for design of transmission structures? I've seen some clients limit deflection under everyday case but I thought transmission design was mainly based on ultimate limit state? and vertical loads for poles are not huge so shouldnt get too much P-delta effect. I take it...
  9. ab21

    Pole Foundation (Drilled Shaft)

    Thank you all for your input, you have been very helpful.
  10. ab21

    Pole Foundation (Drilled Shaft)

    steveh49 Bending moment is 3m below ground level (thats what Ive assumed). Its ultimate moment. I've applied 0.7 reduction factor on soil strength when using Brinch Hansen. Come to think of it, when designing based plate pole, are we assuming that base plate connection to the pile is moment...
  11. ab21

    Pole Foundation (Drilled Shaft)

    Thank you all
  12. ab21

    Pole Foundation (Drilled Shaft)

    Sorry for my stupid question but I havent designed piles before (I have designed pile caps but pile design was given to the contractor). I know maximum moment will be 2000kNm, I've used Brinch Hansen method and I know embedment depth needs to be 8m. The question is how can I design it...
  13. ab21

    Pole Foundation (Drilled Shaft)

    Thank you all. If I were to design a pile foundation, structurally can I design it like a beam (because the soil will restrain it against buckling) or does it have to be designed like a column?
  14. ab21

    Pole Foundation (Drilled Shaft)

    dauwerda and HotRod10 Thanks for your contributions, not doing 10% of height + 0.6m, based on Brinch Hansen method the embeddment depth should be about 8m. I think I will do a cost estimate for using piers as well. This pole only has 5 degree angle on it so works more like a tangent than a...
  15. ab21

    Pole Foundation (Drilled Shaft)

    I will read the document sent. Thanks all for your contributions. The questions I have in my mind at the moment is what is the difference between using a drilled pier and direct embedding the pole? Unless you increase the diameter of the pile the required depth would be the same, and then you...
  16. ab21

    Pole Foundation (Drilled Shaft)

    Lomarandil I will try to get those guidelines but in this instance would I design a single pile with 2000kNm moment? Thats huge for a pile. Ive read that for steel pole its prefered to use drilled shafts rather than direct buried but I dont see the benefit of it except that it eliminates...
  17. ab21

    Pole Foundation (Drilled Shaft)

    Hi, I have a project where I need to design a utility steel pole foundation with large moment (free standing). I know they are mainly directly embedded but want to see what else we could do. From what I read some have designed drilled shafts or pads for these poles, does anyone have any...
  18. ab21

    Transmission Towers- Staggered bracings

    Hi, I have a quick question about a transmission tower I am currently modelling in PLS Tower. I dont have the drawing with me at the moment but I need a quick answer. I have attached a sketch to show staggered bracing in tower legs. Can someone please help me to understand what the L/r ratio...
  19. ab21

    Steel Grillage Type Foundation Design for Transmission Towers

    Hi All, I have to work out capacity of some existing steel grillage foundations for few towers on a route. I have designed concrete foundations for transmission towers but have never designed or come across grillage foundations before. Can someone please tell me where I can find some...
  20. ab21

    Steel angles

    Hi, I have been working in transmission industry for a few months. They use steel angles, single and double angles, a lot in this industry. I have a few questions which I would appreciate if you could answer as I cannot get my head around it. How does compression capacity of the member change...

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