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Recent content by Djidji444

  1. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    No, but definitely an ex-Yugoslav here, but I don't want to throw my country under the bus here now. Unfortunately, a smaller country with a poorly structured system and excellent, but underestimated engineers. In the future I will look at pipeline forums too, thanks :)
  2. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    I completely agree, but the situation is such that this part of the pipeline calculation is given to the structural engineer, whether I want it or not, it is even necessary to adjust the calculation to some extent to structural engineering standards, that's why my questions are more inclined to...
  3. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    I'm just not sure how to treat the buoyancy force as a permanent or variable load, according to Eurocode standard(UPL load combination)? This seems to be a topic of discussion for many people, but more often than not I find it being treated as a permanent load. The safety coefficients with...
  4. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    Thank you all for the answers, t is also more logical for me that the answer is B, I just needed confirmation. And LittleInch, of course, one strives to avoid laying pipelines in swamps, but it is difficult to interpret the data from the limited geotechnical study (plus this is the initial...
  5. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    Yes, but it is not the same: A)the buoyancy/uplift force is lower -> you need smaller concrete ballast B)the bouyancy/uplift force is higher -> a larger area of ​​concrete (bigger ballast) is needed to satisfy the stability
  6. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    I am designing concrete block here, therefore, the number of blocks along the entire pipeline route, which directly depends on the buoyancy. And no, dewatering is not part of the the construction process
  7. Djidji444

    PIPELINE UPLIFT/BUOYANCY CONTROL

    Hello, I have a question for the calculation of buoyancy/uplift on the pipe in the ground during the construction phase of the pipeline (a trench is dug and the pipeline is placed on the ground only). According to the geotechnical studies, the assumption that the underground water level is at...
  8. Djidji444

    Underground protective pipe calculation

    I am from South-East Europe so I try to calculate everything in accordance with European standards, which is difficult because they do not deal with this kind of topic. There are standards that determine the working pipe (not protective-sleeve pipe) and recommendations in the position of the...
  9. Djidji444

    Underground protective pipe calculation

    Some parts are under road some under railway. Sleevless pipes are going to be under less significant roads.
  10. Djidji444

    Underground protective pipe calculation

    Unfortunately, solutions with a protective steel pipe (or as you say sleeve pipe) are the only ones applied, both in the country and in the entire region. Personally, I'm always interested in finding and proposing better solutions, so thanks for the links, I'll be happy to read them, but in this...
  11. Djidji444

    Underground protective pipe calculation

    I am not calculating the working pipe in which the oil is, but the protective steel pipe around it. my protective pipe is exposed to soil and traffic load actions. All these effects have been calculated and now I need formulas for the moments and forces that occur within the cross section of the...
  12. Djidji444

    Underground protective pipe calculation

    Does anyone have calculation formulas for how to calculate moments and forces per meter for a pipe loaded like this(as in the picture below), which is actually a buried protection pipe of an oil pipeline? In other words, how to calculate stresses and thus determine whether the adopted...
  13. Djidji444

    GROUP OF PILES - EUROCODE 7

    Hello! Does Eurocode 7 cover the calculation of the bearing capacity of a group of piles and the calculation of the settlement of a group of piles? and if not, how to check these calculations and stay within Eurocode 7? Should you check these calculations at all if you are doing a pile...
  14. Djidji444

    Punching shear perimeter - EUROCODE

    Hello :) I am interested in where the critical section is located when I look at the puching of a column or pile through the footing. Unfortunately, I have very limited space for the pile footing (pile cap) and really big tension and pressure forces in the columns (therefore also in the piles)...
  15. Djidji444

    Negative pressure at footing-soil interface

    Unfortunately, helical piles would also increase the price of everything (I have about 250 foundations), which I am again forbidden to exceed, so now my question boils down to that if the previously mentioned 3 tasks are fulfilled, is it allowed to have negative pressure under the 1/3-1/4 of...
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