They did get the culverts covered today

fixerupper · Jul 30, 2013

Didn't think they would get this far today but the sand trucks came through. They lost power to the scale at the gravel pit so that's why the sand was coming in slow. It's pretty well packed on top so tomorrow they should be able to tidy things up a bit. That twisted tile will be replaced and re-routed a bit.

Friday

Monday evening

Today right before quitting time.

Anonymous-0 · Jul 30, 2013

Any idea of the load capacity of the new bridge?

fixerupper · Jul 30, 2013

That's something I should ask the county inspector. I would think the rating would go more by axle weight than by gross but I'm no expert. They are trussed inside. The trusses will stay for a year. If he shows up tomorrow while I'm home I'll ask him. Jim

S2710 · Jul 31, 2013

On the road that I live on we have two six foot culverts like the ones that are posted here. They have no weight restrictions on the road. I have seen a semi with a large dozer on the lowboy go across it more then once. The pipes are 40 plus years old and a few years ago they add on to them to widen the road.

Bob

JML755 · Jul 31, 2013

(quoted from post at 22:23:52 07/30/13) Any idea of the load capacity of the new bridge?

I think it will be whatever you can haul on the roads leading up to it. When I put my culvert in (42") I bought it through the County and they said it met State standards for an interstate highway.

Russ from MN · Jul 31, 2013

I think that would depend on how much fill is on top of the tubes.

Mike Aylward · Jul 31, 2013

Interesting they don't use seep collars on the top end of the tubes. Do they not use them in your area? Mike

fixerupper · Jul 31, 2013

The county engineer stopped by today so I asked him about the load rating. He said it will take the heavy manure tanks with no problem. They're one gauge heavier than standard. I don't know about the collars. Maybe they didn't think they were needed in this location. Once the become grass is established it'll stay put. Jim

retired farmer · Jul 31, 2013

From the looks of the job they did, I will give it six months before it starts sinking and leaking.

david - or · Jul 31, 2013

In my opinion the two culverts are too close to each other. For full design strength the spacing of round culverts is supposed to be a minimum of 1/2 the culvert diameter. Minimum spacing in any event is supposed to be one foot so that adequate compaction of the soil between the culverts can be achieved.

Similarly, the cover depth looks a little too shallow. Minimum cover is supposed to be 1/2 the culvert diameter for full design strength.

Soil quality and soil compaction around a culvert is very important. Flexible culverts like these rely upon the soil forming a bearing arch around the culvert. The culvert doesn"t carry the live weight of vehicles, the surrounding soil does.

dpendzic · Jul 31, 2013

culverts are designed according to the AASHTO specifications
Most common is the H20 loading which is a 20 ton 2 axle truck. The rear axle loading is 80% of the total weight --thus 16 ton axle
added to this is the impact factor and that is 30%.
Therefor a semi rig with axles spaced out can go over safely.
Most states limit total load of a semi to 40 ton, and if you have an R permit you can go to 60 ton.

Matt_In · Jul 31, 2013

Around me they would have shut the job down for not having any erosion control near a "wetland"

dpendzic · Jul 31, 2013

forgot to add--most culverts are designed for one foot of fill over the top--but it is essential that the sides of the culvert pipe are compacted in 6 inch lifts to 100% maximum compaction

fixerupper · Jul 31, 2013

That's interesting information. These culverts are possibly 24" apart just by guessing. They did have a little vibrator packer down there between them when the sand went in but I was gone when most of the filling was done. I'm estimating there's 12" of sand and another 12" of black dirt on top of the tubes. Jim

showcrop · Aug 1, 2013

What did they do? 50lbs at a time on a bathroom scale? LOL!!. When I had my dump truck and the scale had a problem they just guestimated and we kept trucking and no one worried about it.

fixerupper · Aug 1, 2013

I think the truckers used a previous scale ticket and kept on a truckin. Jim

They did get the culverts covered today

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