12-24-2006, 08:50 AM
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#8 (permalink)
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| | Re: Velodrome
marian.rosenberg@gmail.com wrote:
> Anyone have a ballpark figure idea of how much it costs to build a
> simple velodrome?
Some time ago I was sitting at an airport with my laptop, real bored
and not wanting to do any work, so I started wondering if I could build
a velodrome on my land. First I Googled info on velodromes, then on
concrete. Below is the complete text of what I wrote. My $20K
estimate is likely very low.
Tom
********* Beginning of Toms Velodrome.txt ********************
The San Diego Velodrome is 333.33 meters. That length is figured from
a line around the velodrome 20 cm above the base of the track.
Another standard size is 250 meters. There seem to be a lot of them
in the world. The smallest is 125 meters (8 laps per km).
A 250 meter velodrome will have 43 degree slope on the ends and 13
degree on ths straights. A 125 meter velodrome will have 50 degree
slopes on the ends.
I couldn't find any info on the aspect ratio but I did find a 250
meter velodrome that was 115 m x 55 m external and 100 m x 40 m on
the infield. That means the track is 7.5 meters wide.
The velodrome external dimensions are then 125.7 yards (377 feet) by
60.15 yards (180.5 feet). Half that size for a 125 meter velodrome.
By simple trig the hole in the ground to create a velodrome with a
50% banked end would be 6.28 meters (6.87 yards, 20.6 feet). Wow!
To determine how much concrete this would be I have to calculate the
area of a 250 meter velodrome track. The area of the straights is
easy.
Each straight is 60 m long (115 m - 55 m) and 7.5 m wide. And there
are two of them. So 2 x 60 m x 7.5 m = 900 m^2 (1076.4 yds^2).
The ends can be considered two concentric circles. The outer one has
a radius of 55 m and the inner has a 40 m radius. The desired area
is the area of the outer circle minus the area of the inner circle.
So (pi x 27.5^2) - (pi x 20^2) = 1119.2 m^2 (1338.5 yrd^2).
So the total is 2019.2 m^2 (2414.94 yrd^2). The actual surface area
is larger than that because this calculation doesn't consider the
banks.
I've seen estimates of concrete driveways at $10/yrd^2. That would
make
the 250 meter velodrome cost $20K. A velodrome wouldn't have to
withstand
the weight of autos but it would have to be built with a sharp slope
and
built solid enough to avoid cracks.
********* End of Toms Velodrome.txt ********************
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