New bridge,work in progress

[ColinV6]

Thought I’d share some progress pics of a river bridge we are having built by a local engineering company. It’s a 60ft single span, 15ft width.

Previous one was washed away in last years floods leaving us no access to 77 acres of grass land.

 

[bitwrx]

I like the way it barely fits in their workshop.

 

[ColinV6]

I like the way it barely fits in their workshop.

Haha yeah it certainly takes up all of that bay!!

We were wondering if it was going to be strong enough, I’d say it’s borderline overkill now but better to be safe than sorry!

 

[Wombat]

Cannot beat a good build thread

 

[Wombat]

Haha yeah it certainly takes up all of that bay!!

We were wondering if it was going to be strong enough, I’d say it’s borderline overkill now but better to be safe than sorry!

If you work out the money you have crossing it then on a one off you struggle to overkill it

 

[ColinV6]

If you work out the money you have crossing it then on a one off you struggle to overkill it

Very true, heaviest thing over it I would say would be tanker and tractor at around 22 tones? Old bridge had 2 supports in the middle so could be far less strong. In the end the supports got washed away and the whole thing went. Hence single span this time

 

[Lazy Sod]

I like the way it barely fits in their workshop.

Perhaps we should start a new thread entitled "How to remove a bridge from a workshop"

 

[Dan@JF]

Whats the plan to get it into place?

 

[kill]

Checker plate floor? Or something else?

Can you get that galvanized??

 

[ColinV6]

Whats the plan to get it into place?

It will all get dismantled, blasted and painted, and the 3 915mm beams will get brought down on a lorry. Then craned into place. After that the engineers will simply bolt it all back together on site.

There’s also side rails and the deck will be 6mm chequered plate

 

[ColinV6]

Checker plate floor? Or something else?

Can you get that galvanized??

Yep chequer 6mm plate, don’t want it galvanised because of a) cost, and b) it’ll stick out like a sore thumb on the landscape. It will be going a darker gunmetal grey colour

 

[Chae1]

Dad made a short river crossing with concrete panels!

Haven't broken it yet but i like to hit it at speed to make sure momentum takes me to the other side.

 

[Chae1]

Haha yeah it certainly takes up all of that bay!!

We were wondering if it was going to be strong enough, I’d say it’s borderline overkill now but better to be safe than sorry!

Will the army be crossing it with tanks!?

Certainly looks strong enough.

Dread to think what it costs.

 

[ColinV6]

Dad made a short river crossing with concrete panels!

Haven't broken it yet but i like to hit it at speed to make sure momentum takes me to the other side.

I believe the saying for that is, If in doubt.... FLAT OUT!!

 

[ColinV6]

This was the previous bridge, photo taken about an hour before it let go.. and where it ended up, and what we were left with

 

[suffolksmallholder]

Well looking at the picture in all honesty I'm surprised you've gone and made just a bigger copy! Me, I'd have made an arched bridge on those concrete revetments or improved them to say the least. This looks like it will provide a lovely big area for the water to hit and need even less than the last volume of water to wash it away......Get some new revetments made further away, and higher so when the river surges at least the bridge will be above the water level and the gap is wider to let the water flow through without interruption.

SS

 

[Y Fan Wen]

Dad made a short river crossing with concrete panels!

Haven't broken it yet but i like to hit it at speed to make sure momentum takes me to the other side.

Oh dear! That book and film Around the World in 80 days has a lot to answer. The weaker the bridge the slower you take it. The inertia of a moving mass increases with speed which ups the strain on the structure. That's why there are speed limits on railway bridges. Travelling from Stranraer to Ayr once I passed over a bridge at about 5mph, literally walking pace.

 

[ColinV6]

Well looking at the picture in all honesty I'm surprised you've gone and made just a bigger copy! Me, I'd have made an arched bridge on those concrete revetments or improved them to say the least. This looks like it will provide a lovely big area for the water to hit and need even less than the last volume of water to wash it away......Get some new revetments made further away, and higher so when the river surges at least the bridge will be above the water level and the gap is wider to let the water flow through without interruption.

SS

Abutments are being made a lot stronger, wider and the bridge will sit higher, with a concrete ramp up for the extra height.
An arched bridge is a whole new level of engineering and cost.

 

[Bury the Trash]

Oh dear! That book and film Around the World in 80 days has a lot to answer. The weaker the bridge the slower you take it. The inertia of a moving mass increases with speed which ups the strain on the structure. That's why there are speed limits on railway bridges. Travelling from Stranraer to Ayr once I passed over a bridge at about 5mph, literally walking pace.

Same physics as when you try to plough faster ...it needs corispondingly more power for the same outfit.at the same depth ......

 

[A1an]

Abutments are being made a lot stronger, wider and the bridge will sit higher, with a concrete ramp up for the extra height.
An arched bridge is a whole new level of engineering and cost.

We did a similar thing in 2008 after a flood took out our river crossing that had been there 40 years. We built the same bridge again but raised the abutments another metre.