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  • Users: nader666
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  1. nader666

    Driving Pre-cast Piles

    Hi everyone, Does anybody know the difference between driving a conventional (regular reinforcement) pre-cast pile and pre-stressed pile, the conventional pile cross section is 10" x 10" and the pre -stressed is 12" x 12" (if there is a difference). Do we need different type of equipment to...
  2. nader666

    pre-stressed concrete piles

    Hi every one, Does anyone know what the effect of cutting the pre-stressed strands to adjust the top pile elevation and weather the epoxy dowels to connect the pile to the pile cap is better than exposing the strands during the cut off procedure and tie them to the pile cap reinforcement, if...
  3. nader666

    Shallow precast sanitary structure

    Hi everyone, I am trying to follow ACI 350 to design a shallow grease trap tank (about 9 feet deep with about 6 feet of liquid) but I am not sure what would be the minimum walls thickness and the minimum wall reinforcement according to ACI 350. Can you please help Thanks
  4. nader666

    Minimum Wall Thickness of Precast Environmental liquid Retaining Structures

    Hi, According to ACI 350-06 - 1.1.1.1, ACI 350 is not covering precast structures covered by ASTM except precast circular tanks. AS per Chapter 14 , the minimum wall thickness is 12" if the wall is 10 feet or more in contact with liquid but for conventionally cast in place walls. I just...
  5. nader666

    Design of underground precast Structure

    Hi everyone, I am the review engineer of a new sewer pump station project which has a 23' deep & 10' diameter grease trap. The contractor has submitted a shop drawing for the grease trap (copy attached) with a monolithic base and solid rings on top, the submitted shop drawing shows 4" thick...
  6. nader666

    Deep Precast Grease Trap Design

    Hi everyone, I am the review engineer of a new sewer pump station project which has a 23' deep & 10' diameter grease trap. The contractor has submitted a shop drawing for the grease trap (copy attached) with a monolithic base and solid rings on top, the submitted shop drawing shows 4" thick...
  7. nader666

    Structural Steel T Supports

    Hi everyone, I have designed a T steel supports for overhead duct line. The contractor have used channels between the T support and the pipe support (photo attached) to make up the difference in elevation due to some short T supports. The contractor did not get a field adjustment approval and...
  8. nader666

    Tanks Repair Using Shotcrete

    Hi everyone, I am using shotcrete mix to repair slab ceiling and walls of wastewater tank. I have proposed the following scope of work for the tanks repair: SCOPE OF WORK 1.Remove of deteriorated concrete cover throughout the tank ceiling and upper section of the walls up to at least 1 foot...
  9. nader666

    Multi-Cell Rectangular Concrete Tank Design

    Hi Everyone, I need help using Autodesk Robot structural analysis software to design multi- cell tank. I would appreciate if you can explain the steps of using the software to design the concrete tank. Thank You so much!
  10. nader666

    TANK WALL DESIGN

    Hi everyone, I am reviewing a modification to wastewater existing tank by adding a dividing wall, the tank is 29' x 29' 18' high and the dividing wall is 18' from the side wall. The structural engineer submitted a structural calculation based on 11.5' water depth using PCA tables using...
  11. nader666

    Using ACI 318 in tanks design

    Hi everyone, I am a reviewing a tank design calculation submitted by a NYS Structural Engineer. I do not agree with the calculation and I want to get your opinion about some of the assumptions in the structural calculation report. 1. The report considered ACI 350 just a recommendation and...
  12. nader666

    4000 psi VS 5000 psi Concrete

    Hi everyone, I am involved in reviewing shop drawings for a sewage treatment plant project. The treatment reinforced concrete tanks were designed based on 5000 psi concrete, the design plans are showing 16" thick walls and # 7 @ 9" vertical rebars. A new structural engineer has been assigned...

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