Mock up Process II.
HALS (Historic American Land Survey )
HALS is a committee who checks the design of any new structure that will be built in historic lands. Since Payne Lake is a historic land, we also had to consider that aspect of our design, which is why we researched old bridges on Alabama.
Once the concept was completed and we had an over all design, series of renderings were sent to our client. From now on, the details may change, but the over all look is going to stay the same. These Images show the view of the bridge at different locations around the lake. Every image has a little map of the lake next to it that shows where the person is viewing the bridge from…
Our client, Cynthia Ragland, is going to submit these images to the committee along with a research that Gene Ford. Gene is an Archeologist who works for Moundville Archeological Park. Hopefully Gene’s documents and his point of view is acceptable to the committee.
What is a Comfortable Angle?
Now there is a section for the bridge, but there are different ways to experience this section. What is an appropriate angle for the walls?
We tried to create the space with a couple of pieces of Foam Boards. We marked the walls at different angles, and asked student in studio to walk through the section, and tell us how they feel about each angle.
Over all the angle: 80-80 seemed to be the solution. We could have a 3 feet wide walkway, and yet spatially be comfortable at waste height, and the bridge didn’t feel like a narrow tunnel.
Dan wheeler/Architect is one of our critics who came from Chicago. After we presented to him he made a suggestion that made everything clear!
By moving the figure from the top of the decking inside the section, we suddenly had a section that functioned:
Forestry has provided a document called ” FSTAG” which stands for Forest Service Trail Accessibility Guidelines. In that document they require Live Load of 65-85 lb. /PSF. We have been trying to decrease our live load because the bridge will, almost, never be fully loaded, and that means pontoons would float so high on the surface of the water. Aesthetically we did not like that idea… The current critique would allow us to have a section that had the most narrow walkway, and decreased our Live Load to 1/3 of what it was before!
More Things to Consider
If we can not build at the site or close to the site, the pieces have to be pre-fabricated. Since the site has no vehicular access, may be they should be floated out there. If we have to float the pre-fabricated pieces out there, should we have a floating bridge?
By floating the bridge, the structure’s foundation is not touching this historical land. It is a very thoughtful way of touching the ground. So…
A lot of farms that survived Clarck-McNary act, eventually turned into catfish farms. Payne Lake used to be a farm which is now a manmade lake with fishing opportunities. It was an intriguing concept to use use catfish farmer’s pontoons for our bridge. We needed to contact some local businesses and find out about them. It was not difficult to find the guy who manufactures them since we are in ”catfish capital of Alabama”.
Pontoons normally last about 20 years, and not too pricy. How many do we need? It depends on “Live Load” and “Dead Load” of the bridge. We need to know the section of the bridge, and how much load creates a safe balance?