Action Pics

dayexco

thought i'd post a few pics of a job we did last summer. new sanitary lift station at a sewer lagoon site, the diversion manholes, etc. lift station was 10' diameter, 18' deep. the diversion manholes had sluice gates in them, would either keep flow going to lower elevation ponds, or into the lift station to pump it up to the new ponds that had to be built at higher elevation due to crappy soil conditions

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PipeGuy

Cool. Was the 120" diameter precast or c.i.p.? How 'bout the pipes pictured, is that ductile or polyethylene?

rino1494

Nice pics.........looks like easy digging too.

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dayexco

all the concrete is precast. the lift station we had to get a crane to set it. we we able to set the 2 diversion manholes ourself. all the piping there is 18" m.j. d.i.p., every joint mega-lugged. lots of bolts LOL...we bought a rechargable dewalt 18 volt 1/2" impact, 3 extra batteries. speeds it up a lot

that is very typical of our soil conditions here. we do have rock here, but from what i read of your posts...nothing like what you have at all. they're scattered, not tight together, and we never have probs with bedrock. closest thing to rock outcroppings to us is about 100 miles to the south. most of our digging is either a very tight clay, or gravel

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PipeGuy

we did the same. it really makes for quick work. our inspectors make us put a torque wrench on the nuts to finish.

rino1494

Do you guys use a manhole transit ?? They seem like they would pay for themselves over time, but we just use a regular transit for our sightline.

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dayexco

you mean to set up the alignment for the pipe laser? we don't use a transit, we use the stringline attached to back of laser, aim for point where it wants to end up, most of the time, can get it within inches.

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dayexco

pipeguy, we torque them all too. here's an interesting thing that happened to us, and something you may want to watch for. we did an ethanol plant here. about 4000' of 12" c-900. it was in the 90's when we put it in, and the line wasn't energized until the next march. we had about 15 leaks on the 12" m.j. fittings. the engineers came to the conslusion that at the time of installation, the pipe was hot, gaskets were hot and "expanded" because of the heat....we tightened/torqued the bolts on the glands, snapped the nuts on mega lugs...over the winter, and cool ground, the gaskets "relaxed"....and the mega lugs prevented the gland from pushing in on the gasket even with the proper torque we had applied on the bolts...interesting, huh? i think it's important to fill these lines absolutely as soon as possible.

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rino1494

How do you shoot your next hub then ?

We set offset stakes running parallel 15' to the main line every 15'. We set up the transit on the center of the pipe and shoot the next hub. Then we dig the trench and measure back 15' and drop a plumb bob. Shoot the plumb bob with the transit and then set up the laser by the transit hitting the dot in the trench. We check the first 60' this way. We hit the next hub pretty much on the money.

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jmic

Rhino,
Same way I was taught.

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dayexco

if we're starting from an existing manhole, we set our laser in the invert of the manhole, hook a stringline up to a notch in the front of the laser made just for it...take it straight up out of the manhole.....hold the stringline straight up, line it up with your hub that you're going to end at, take your laser remote, move the beam left/right so the beam is in direct line with your stringline and hub...nothing to this silly game!! occasionally we'll drop a plumb bob down from an offset hub to check ourself if it's a long run....400' plus, but you'd be amazed how straight you can get em just using the string line

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someday, i'll be as patient as Nick.