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Bridge Pictures.

 
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Old 07-10-2015, 07:49 PM   #41
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Re: Bridge Pictures.


Yeah, weather has been nice. Fairly cool for this time of year, although today was plenty warm. Rain earlier in the week which was why I went to the side project.

There's a definite trade off between just being a by the hour/day guy oin this job and not having any responsibilities but on the other hand not having any control. Lots I would do different, but never having done project quite like this it's nice to know I won;t loose my shirt on it. I won't make my fortune either though.

If I had bid it the way I still would bid it the project would never have gone through, as it is I think we'll just squeak in @ budget with the HO doing some of the work and having done the forming for the footing and building the trusses even though they weren;t done exactly like I would want them
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Old 07-10-2015, 07:52 PM   #42
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Re: Bridge Pictures.


Really cool project. Looking real nice !
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Old 07-10-2015, 10:52 PM   #43
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Re: Bridge Pictures.


Interesting how you are ranging each voussoir from one side to the other. It's looking great Sean, wish I was there.
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Old 07-11-2015, 08:48 AM   #44
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Re: Bridge Pictures.


Are you going to go over the whole arch or get some weight on it as you go?
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Old 07-11-2015, 10:00 AM   #45
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Re: Bridge Pictures.


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Interesting how you are ranging each voussoir from one side to the other. It's looking great Sean, wish I was there.
Would you have done a course fully across and then another, then another? I think this way is better, first you can keep everything in plane by finding the focus at either end and filling in between them, otherwise you'd be sort of guessing at each the angle of each subsequent course. This is a true ellipse (not my idea, I tried for a segmental, then I tried for a 3 centre, no go he used the string method) So that means that each point on the arch has a different focus. We're cheating a little by finding a focus that works for a couple of courses then once it starts running off the ellipse we move down and extend the string. Non-regular voussoirs have also slowed things down. I wanted to do a 3 centre method that would approximate the shape of the ellipse but he refused, that's when we came up with what will end up being a 7 or 9 centre.

The other thing is that if 1 voussoir fails (lets say 1 out of a total of 300), because of the lap of the voussoirs above and below, the arch will only be 1/300th less strong (the ones above and below and to each side would probably loose some strength because they'd shift so maybe it would be 1/100th or something less strong). If you did 1 course at a time (there are typically 12 stones across so say 12 courses) and one voussoir failed you'd loose that entire ring so the arch would be 1/12th less strong, quite the difference.

I may be wrong about that but it's how I see it
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Old 07-11-2015, 10:03 AM   #46
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Re: Bridge Pictures.


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Are you going to go over the whole arch or get some weight on it as you go?
The sides will be built up at least until the point where the angle of the voussoirs is more than 45*. Want to have some mass there for when the centre is removed. We're past that point now on that one side, but I haven't built up to it yet.

Still not sure how he's going to drop the centre, the other day he said, jeez I should have put it up on wedges....yup
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Old 07-11-2015, 10:11 AM   #47
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Re: Bridge Pictures.


them rocks look heavy
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Old 07-11-2015, 10:16 AM   #48
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Re: Bridge Pictures.


Some certainly are
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Old 07-11-2015, 10:23 AM   #49
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Re: Bridge Pictures.


No, I think you're doing the right thing and it was a smart thing to do. When I did the gothic vault on my oven, I snapped caulk lines on the centering, but on all the others I just used a level.

To bad he didnt have you cut some gauged voussoirs, then you could have marked out your centering. He should have looked at some of your banker work..it would have been convincing!
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Old 07-11-2015, 10:25 AM   #50
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Re: Bridge Pictures.


But like you, I set the two opposing voussoirs and level between them...it's really no different than wall building in that respect.
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Old 07-11-2015, 11:05 AM   #51
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Re: Bridge Pictures.


Sean I grew up building stone wall and veneers with piled high stone...ie most of the time on hillsides...the old man would get mad if we left the big ones at the bottom!...or if someone over picked the pile for nice faces...lol

In that the form is sheathed are you dressing the stone to lay mostly flat on the sheathing or just shopping for flat as can be faced stone.

I.E. it's difficult laying bellied stone on that and getting the perimeters to align unless you pitch all stone perimeters back the same amount ..... coming nice....gee arent you worried the wood will expand when rain comes then spring the bond......kidding.
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Old 07-11-2015, 01:08 PM   #52
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Re: Bridge Pictures.


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To bad he didnt have you cut some gauged voussoirs, then you could have marked out your centering. He should have looked at some of your banker work..it would have been convincing!
He's looking for rustic...like a bridge next to an old grist mill in the countryside, gauged voussoirs wouldn't fit with the rest of the design and definitely would have pushed the project over budget.
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Old 07-11-2015, 01:15 PM   #53
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Re: Bridge Pictures.


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..or if someone over picked the pile for nice faces...lol
My old partner was terrible for that. I could almost always tell which stones he'd go for first. The bottom of his wall would look awesome and the top would look like less awesome, or he'd slow down big time because he'd be scrounging
In that the form is sheathed are you dressing the stone to lay mostly flat on the sheathing or just shopping for flat as can be faced stone.
No, not really either, I'm trying to find the best faces for the front but there are going to be some big joints and some tight ones, particularly heads. It's going slow enough just finding stones that will work. The face in that area will be in and out by 1/2" or more. A trade off
I.E. it's difficult laying bellied stone on that and getting the perimeters to align unless you pitch all stone perimeters back the same amount
I'm doing what I can in what I hope is a timely manner. the faces won;t be perfect...hopefully the troll who ends up living under it doesn't get too angry and stomp me
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Old 07-11-2015, 03:06 PM   #54
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Re: Bridge Pictures.


This is awesome, might even justify a drive up there just to take peek some weekend..... Any hotels/bars in the area?
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Old 07-11-2015, 03:38 PM   #55
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Re: Bridge Pictures.


Couple of bed and breakfasts in town and a couple of bars for sure
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Old 07-11-2015, 08:42 PM   #56
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Re: Bridge Pictures.


Just sawcut the main joists and the falsework will drop enough to get it out. How much rubble fill will there be over the top?
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Old 07-12-2015, 06:51 AM   #57
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Re: Bridge Pictures.


Re;''Trolls living under the bridge''....well said!
Looking nice,so then it's a ''Troll Bridge''
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Old 07-12-2015, 09:03 AM   #58
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Re: Bridge Pictures.


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How much rubble fill will there be over the top?
????
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Old 07-12-2015, 12:49 PM   #59
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Re: Bridge Pictures.


Between the inner face of the arch and the roadway, how thick is the finished bridge at the apex, if that makes any more sense. I just assumed the material between would be rubble, not coursed stone.
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Old 07-12-2015, 01:49 PM   #60
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Re: Bridge Pictures.


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Between the inner face of the arch and the roadway, how thick is the finished bridge at the apex, if that makes any more sense. I just assumed the material between would be rubble, not coursed stone.
Ok. So the voussoirs are a minimum of 12", but the outer face stones are 14-16". At the crown there will be at least 1' of material, and then a concrete roadbed. There are no finished heights really because it needs to work with the existing road that comes in and with the rock pile on the road it's difficult to figure out. The only thing truly determined are minimums. so at the crown of the arch, from intrados to the bottom of the road bed is 2'2" at least.

The material between the outer courses of stone is rubble but it is fitted to some degree so there is lap and it isn't just scrabbly junk (although lots is). It's made up of a variety of sized stones, some weighing over 100lbs (very few) but most in the 10-30lb range with plenty also in the .25-5lb range.

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