how many safety factors does an engineered problem include? by the time the calculation is done what really is the safety factor. from the material properties that the manufacture uses to provide a piece of wood at some safety factor to the last 1.5 factor at he end.
Here is a scenario...A site is being built near an ancient landslide and in order to build at that site the landslide material or "dirt" must be made structurally sound. I have done this by removing the the lower portion of the landslide and building a buttress at the base of the landslide to...
to prove bridge falsework pads i have poured a 4' x 6' x 12" thick reinforced concrete slab and loaded it with temporary concrete barrier (krail or jersey rail)
we needed 4000 psf so we loaded
it took (24sf x 4000psf)= 98000lbs/8000lb barrier = 12ea pieces of 20' long barrier. we stacked 2...
I got into the heavy civil construction market working for a large contractor. I was very satisfied and am still doing it ten years later. We concentrate on transportation products which require onsite construction management, offsite estimating and job procurement, and an overall insite into...
When you say you wedge it between the wedges, do you mean you put a wedge inbetween the lagging and the flange at each end of the lagging, then by removing the wedges you create relief to ease the removal?
I have been on several projects that use W14X145 or 120 soldier piles with 3x12 wood lagging. How should the lagging be installed to aid in removal without cutting the lagging. Is there an easy way out there to remove the lagging from the bottom up as backfill progresses? Our guys will just...
The company I work for is deciding to purchase AGTEK grading takeoff and modeling software. What is everyones positive and negative feedback on this software? Is the most popular available, or does anyone recommend other vendors? We are a grading contractor and will use it use for bid...
Try checking out the Caltrans Falsework Manual Section 4-5.01. This is used in the design of temporary bridge falsework, but can be very useful for other things as well. http://www.dot.ca.gov/hq/esc/construction/Manuals/Falsework/Falsework.htm
Good Luck
I have bid on landfills with HDPE geomembrane liners (60mil) and HPDE pipe leachate recovery systems. You might want to try a google search on leachate compatibility with HDPE materials and what typical concentrations of benzene are in leachate. Just a thought.
I am dealing with 4 ton riprap. That is about a 2 cy chunk of rock, pretty big. It is for a coastal eddy. The rock will be placed with barge derricks. I dont have a practical way to test this scenario until it actually happens. Any contractors out there with experience?
These are very good responses. I find them to be by experienced people. In my experience skin layovers quickly disenigrate over time with vehicular loading. We always make a clean sawcut, gut out the area, and repave. This could be a deep AC section if the area is small. Similar to...
Ron,
Thanks for your interest. The specification on my job is a minimum 2.4 specific gravity. That's 150 pcf. The source I am looking at is 2.6, 162 pcf. That is the density of the "solid rock", higher than concrete. I assume (I hate using that word, but that is what brings me to write...
I am trying to estimate how many tons of riprap per neat cubic yard of placement. I am thinking along these lines:
1) Determine riprap density from source...assume 155 lbs/ft3 in this case. That's about 2.09 tons/cy of 'rock'
2) Now the part I need someones experience on is how much void to...
I am trying to estimate how many tons of riprap per neat cubic yard of placement. I am thinking along these lines:
1) Determine riprap density from source...assume 155 lbs/ft3 in this case. That's about 2.09 tons/cy of 'rock'
2) Now the part I need someones experience on is how much void to...
