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  • Users: kieran1
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  1. kieran1

    Piling Hammer Efficiency for Raking Piles

    Can anyone help me in determining the hammer efficiency of a Junttan PM16 piling rig with a 4ton HHK3 hydraulic hammer. I'm trying to determine set calculations for a 1:3 Raking pile. I'm assuming there will be some loss in efficiency due to the rake. I normally assume a 65% efficiency for...
  2. kieran1

    Retaining Wall cold Joint

    I have a situation on site were we are constructing a 9.0m high retaining wall. The stem is 650mm thick and the horizontal pressure is 430KN. The contractor proposed to construct the wall in lifts of 1.2m however the first lift took 3 days and there is two cold joints in the wall. I should say...
  3. kieran1

    Piling Problem

    I have a situation where load bearing piles have been installed behind a proposed jetty. The contractor has said the piles were installed to refusal, which I doubt. It is proposed to dredge the area under the piles after a concrete beam is cast, to a level 6.0m below water level. The piles are...
  4. kieran1

    Retaining Wall Construction Method

    I have a 10m high reinforced concrete to be constructed. The contractor wishes to pour in 1.2m high sections and backfill & compact both sides of the wall to simplify the formwork. The fill in front of the wall will then be excavated out when the wall is complete. Anyone ever do this, what...
  5. kieran1

    Existing Retaining Wall Problem

    We have a site where our client wishes to fill with new offices. The problem is the ground level rises from the front street to the rear of the site by 1.7m. Now the site is only 20m long and 12m wide. To complicate matters there is an existing retaining wall at rear of the site. This retaining...
  6. kieran1

    Bridge Problem

    I'm working on remedial works to an existing bridge an Africa. It looks like it was constructed in the 1960's. Anyway I don't have any details on the existing design. I tried to analyse the bridge for the existing spans with current truck loading etc and it comes no where near to working...
  7. kieran1

    Concrete Compression Ring.

    I asked this in the Earth Retention Engineering Forum but its pretty quite in there. Can anyone recommend any guidance on the design of collar beams for corrugated steel culverts. I need to design these beams to stiffen the cut ends of the culvert. I think the beam needs to be designed as a...
  8. kieran1

    Steel Culvert, Collar Beam Design

    Can anyone recommend any guidance on the design of collar beams for corrugated steel culverts. I need to design these beams to stiffen the cut ends of the culvert. I think the beam needs to be designed as a concrete compression ring. Kieran
  9. kieran1

    Excel Formula

    Can anyone help a rusty engineer write a formula in excell. I want to type a number in a cell which will give an answer in another cell. Sorry if this is pretty basic. If Cell A = 10 answer in other cell is 30 If Cell A = 11 answer in other cell is 30 If Cell A = 12 answer in other cell is 31...
  10. kieran1

    Spring Stifness

    Sorry if this has been covered before. Can anyone point out a rule of thumb for estimating the soil spring stiffness from the bearing capacity. It has been suggested to me a value of 40 times the bearing capacity divided by a factor of safety. (KN/m3 units) This is for modelling a raft...
  11. kieran1

    Foundation Design For Retaining Wall

    I need to design a retaining wall which will retain 10.0m. I have a geotech report that states the N value of the soil at foundation level is 14. Can I assume a bearing capacity of roughly 10N + Overburden pressure. The soil is a Lateritic Clay and the water table is at 9.0m below ground level...
  12. kieran1

    Sierra Leone

    Anyone know what design codes are used in this country?. Also does anyone have any advice for working there? Kieran
  13. kieran1

    Lime soil mixing

    Can anyone offer any experience on this method of ground improvement for a filled site. The contractor is proposing this method of ground improvement on which traditional foundations will be constructed. We had originally specified vibro-compaction. I have read up a bit about the method and...
  14. kieran1

    Pile Design Using Dynamic Probes

    We have been asked by a contractor to design a precast concrete pile (450KN safe working load) However the only information available are dynamic probes. 10 probes were carried out and the N100 values plotted. The average depth is 9 metres for the 25blows/100mm values. The hammer weight is 50Kg...
  15. kieran1

    Helicopter Hanger

    Our Client has asked that we design him a helicopter hanger consisting of a basic 20m Portal Frame with door on gable. We intend to design it as an opensided building for wind forces etc but where would we get information on Helicopter Weights and forces generated by the rotars Etc. He has not...
  16. kieran1

    Concrete Protection In A Storage Building

    Can anyone recommend any special precautions to be taken for the concrete floor and walls in a storage building. The main storage material will be Nitrate based fertilizers. I intend to use horizontally spanning precast concrete wall panels between steel columns for the retention of the...
  17. kieran1

    Jetty Wall Construction

    I'm Designing a Jetty Wall for the docking of boats on an inland freshwater lake. The wall consists of Concrete Manhole Rings filled with concrete. The Wall is Anchored to the Bedrock at the bottom by grouting reinforcing bars into the rock and anchored at the top by tying a reinforced capping...
  18. kieran1

    Go-Kart Track

    Does anyone have any information on the design and layout of go-karting tracks. Are there any standards that apply. Its the first time i have been asked to design one and any information would be most helpful. Kieran
  19. kieran1

    Jetty Wall

    I'm Designing a Jetty Wall for the docking of boats on an inland freshwater lake. The wall consists of Concrete Manhole Rings filled with concrete. The Wall is Anchored to the Bedrock at the bottom by grouting reinforcing bars into the rock and anchored at the top by tying a reinforced capping...
  20. kieran1

    Architectural Masonry

    I recently designed a two storey steel framed shopping centre with the provision for an extra floor some time in the future. Having no specifiaction for the external cladding i allowed for an angle section at first floor around the perimeter of the building to catch the outer leaf of cladding at...

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