A reference I have been pointed to in the past are these stake tests:
http://www.fpl.fs.fed.us/documnts/fplrn/fpl_rn02.pdf
As you can see, the 0.60 CCA holds up pretty well after 40-60 years, as PEinc infers. PEinc also makes some good points that the lagging will not disintegrate and leave a...
As you suspect, one if the differences is in the interlock design. Hot rolled sheet piles have "thumb" and "finger" or "ball" and "socket" designs whereas a colled rolled section will generally have the ends rolled over. The process by which the steel section is formed also has an affect on...
As mentioned, an angle welded to the sheets and then the pipe welded to the angle should work. You may want to shim the angle out a bit to allow more grid to wrap around the pipe instead of just at the sheet pile bellies.
I agree with PEinc, most of the deflection will be out of the sheeting...
I have seen this done with a soldier pile wall. You weld brackets to the face of the wall to hold a pipe spanning between them horizontally. The geogrid then goes from the block to and around the pipe then back to the block.
You can reference CRSI and ACI. CRSI tables for concrete columns can be used to determine the amount of reinforcing needed. ACI has sections that dictate what the shear reinforcing is required. I forget the section off hand, but it indicates a formula for the minimum volume of reinforcing...
Contractors usually calibrate the pumps prior to the intallation of any piles. The grout is pumped into a 55 gallon drum. The drum should measured, 55 gallon drums are not usually 55 gallons. The drum is filled with grout while counting the strokes. Once filled, the volume per stroke can be...
To add to what Ron listed, it is OK and actually preferrable to have the pumped volume to be greater than the theoretical. This is due to the 'head' alluded to and the fact that the auger is rarely absolutely straight. So, while the auger 'wobbles' to the desired tip, a hole of slightly...
Steel sheets can absolutley be spliced together, whether in a low headroom application or not. IIRC, there are even splice guides, similar to the ones used for H-Pile splicing.
I would caution though, that the integrity of the spliced sheet as a moment resisting element may not be as reliable...
I don't have a detail to share, but I would say pay attention to welding requirements for anything you attach to the micropile casing. The casing is generally 80 ksi steel and requires special procedures to have anything welded to it.
Putting the timber piles in first is one solution, although it makes the site somewhat difficult to navigate for the augercast pile installation.
The other solution would be to drive the timber piles second, and ensure that the initial set has taken for all of the augercast piles.
Either way...
Zambo - While waiting 28 days may be the prudent thing to do, think of the cost implications of having the construction equipment, and possibly the crew, on standby. These costs would outweigh any benefit of the additional cure on the pile, in my mind.
If the soil for which the pile is installed is 'dry', it will wick away whatever moisture is within the grout causing it to become less plastic. That is the statement I was trying to make.
Pile load tests on augercast piles can be tested within 7 days if the grout mix is adjust appropriately...
Correct, the problem becomes a simple concrete member in bending.
To resist the bending you could design a tied reinforcing steel cage or size a steel beam to be placed within the pile. The cage can be designed using the latest CRSI Design Handbook in the circular column tables. Or use the...
