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A few projects I have done recently

Discussion in 'Showtime!' started by CM1995, Mar 15, 2012.

  1. dirty4fun

    dirty4fun Senior Member

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    Those boilers were built 30 miles from where I live. Lots of them still being used in large buildings in the area.
     
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  2. CM1995

    CM1995 Super Moderator

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    As the arena turns...

    So the drilled pier contractor hit an existing storm line 3 times while drilling caissons.

    The first time the foundation contractor hit the 30" line they poured up to the flow line and stopped. The second time they hit the pipe was close to the CMU wall and they stopped.

    After they hit the line the second time we were asked by the GC to uncover the existing 30" storm line from the building to the pump station in order to figure out the extent of damage. We potholed the line in a few places and then had a big on-site white hat meeting with folks wearing shiny shoes - ya'll know that type of meeting. Luckily this time around we weren't the focus of it.:D

    During the meeting I asked the drilled pier super about the last caisson they poured that was in a direct line along the existing 30" from the building to the pump station if they run into anything unusual - He replied no. 5 minutes later he spoke up and said "Well we did dump some extra mud in that hole". I asked how much? He said - "It called for 7 CY's and we dumped 16 CY's". I turned around and told the PM - your storm line is full concrete.:cool:

    The third caisson that filled the line can be seen in the bottom of the pic below - straight inline.


    IMG_1024 (1).jpeg
    So we were awarded a nice CO to replace filled line.

    1970's quality workmanship right here. 30" RCP cut on a 45 and not even grouted. This is where the 30" line that drains the entire arena complex dumps into a pump station with 2 Cat powered 8" pumps that dumps into the box culvert we replaced up thread.

    The gap in that 45 was the way they installed it.

    IMG_1100.jpeg
    The concrete filled pipe looked like a corn dog.

    IMG_1101.jpeg

    Site access was tight to say the least. Yeah we knew the dangers of hammering that close to that deep of a trench but there wasn't another way. There is a fiber optic line underneath the track frame closest to the ditch and a 6" med pressure gas main running under the center of the 325. The hammer purchase has earned it's cost.

    Good talent is priceless ya'll.;)

    IMG_1102 (1).jpeg
     
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  3. CM1995

    CM1995 Super Moderator

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    The repair required 2-60" manhole bases we had cored in the field as the lead time was 2 weeks and the project schedule didn't allow it. Since it was a CO the $5K cost to core holes was covered.

    First two MH's set coming out of the pump station.

    IMG_0923.jpeg
    Setting the second manhole. I thought this was a neat pic.

    IMG_1113 (1).jpeg
    Pulling trench boxes sucks and it sucks even more when you have no room and your closest neighbor is a fiber optic line and a gas line. 14' deep to flow line.

    IMG_0925.jpeg

    Space was tight as the schedule was. Our guys rose to the challenge and got the project back on track.

    This was the tie in point from the new line to the existing. Since this line drains the entire project there was a trailer mounted pump in the trench box for when it rained.

    IMG_1144.jpeg
     
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  4. CM1995

    CM1995 Super Moderator

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    More pics of the tie in.

    IMG_1147.jpeg

    The GC rented a 320 Next Gen excavator for a week and they only used it for 2 days so they let us use the last 3 days to help speed the project along. The Next Gen Cat's are pretty damn nice.

    IMG_1148.jpeg

    Tie into the existing line. The caisson that caused all the problems is behind the road plate next to the trench box.

    IMG_1152.jpeg

    Of course the distance from our last full stick of 30" RCP to the existing line would end up being 9'...

    So we spliced 2 - 4.5 sections of pipe together and poured a concrete collar around them.

    IMG_1162.jpeg

    No we didn't leave the pallet in the ditch..:D
     
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  5. Theweldor

    Theweldor Senior Member

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    As always excellent work.
     
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  6. CM1995

    CM1995 Super Moderator

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    Thanks Weldor. We have a good team that knows what they are doing.
     
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  7. CM1995

    CM1995 Super Moderator

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    18" DIP discharge line from the pump station to the box culvert we replaced back up thread.

    We received a CO to encase the existing pipe with 4500 PSI concrete 1' minimum around the pipe. Spec's didn't call to dowel into the box culvert or the pump station but it need to be.

    IMG_1196.jpeg

    IMG_1196.jpeg

    This is the first time we have used Stay Form the metal mesh stay in place forming panels. Worked like a charm and we didn't have to wreck forms.

    4" gas line that feeds the natural gas powered Cat's in the pump station is sleeved with some 8" ADS we had on site.

    IMG_0957 (1).jpeg

    Poured out.

    62328289790__D98A6F8B-565E-4CE7-8E1C-66C27A8E9A66.jpeg
     
    Last edited: Oct 18, 2020 at 1:22 AM
  8. AzIron

    AzIron Senior Member

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    That's top notch problem solving right there

    Now I would love to see the pier guys face when he gets the back charge for filling it full of mud
     
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  9. mitch504

    mitch504 Senior Member

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    Impressive
     
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  10. Nige

    Nige Senior Member

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    Don't bet on it. He'll be somebody's BIL no doubt.
     
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  11. CM1995

    CM1995 Super Moderator

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    Thanks AZ.

    Well as it turns out the caisson company won't owe a dime. According to the GC they have an iron clad contract that indemnifies them from anything they hit underground - I need to hire their lawyer...

    This company is local and really the only game in town unless you go with a big national outfit such as Long or Keller. There is not that much to drilling piers except the cost of entry which with money cheap these days as big a barrier as it was.
     
  12. AzIron

    AzIron Senior Member

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    Cassions are a good business till down hole problems eat your lunch I have seen a few bad days do to soil conditions not being so friendly