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Fiona Scott
Charter Member
 Sep-07-05, 07:32 AM (PDT)
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"building a bridge school project"
 
   I am at primary school and have been given a project to build a bridge. It has to span a 40cm gap. I would like to build a suspension bridge. Can anyone help and please don't make it to difficult.


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  Subject     Author     Message Date     ID  
  RE: building a bridge school projec... Bushman Sep-08-05 1
     RE: building a bridge school projec... Fiona Sep-09-05 2
         RE: building a bridge school projec... Bushman Sep-09-05 3
             RE: building a bridge school projec... Fiona Scott Sep-10-05 4
             RE: building a bridge school projec... sebastian Dec-14-05 6
                 RE: building a bridge school projec... sebastian Dec-14-05 7
  RE: building a bridge school projec... coj Sep-29-05 5
  RE: building a bridge school projec... fhadeela Jan-19-06 8

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Bushman
Charter Member
20 posts		 Sep-08-05, 08:59 AM (PDT)
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1. "RE: building a bridge school project"
In response to message #0
 
   Does your bridge have to hold a weight? What materials can you use?


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Fiona
Charter Member
 Sep-09-05, 05:21 AM (PDT)
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2. "RE: building a bridge school project"
In response to message #1
 
   The work sheet that he handed out says the bridge can't exceed 50cm in length, 20cm in width and 40cm in height. It has to bridge a gap of 40cm. The teacher is going to test how much weight it can hold by puting weights on it. He has not said how much weight and it doesn't say in the work sheet. I can use any material.


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Bushman
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20 posts		 Sep-09-05, 07:53 AM (PDT)
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3. "RE: building a bridge school project"
In response to message #2
 
   Well, I am sorry to say this, but I wouldn't recommend building a suspension bridge.

A would recommend building a truss bridge out of wood. A lot of people use Balsa wood.

As for glue, any common wood glue will work. Elmer's Carpenter wood glue works very well with Balsa wood. You can try adding a little bit of water to the glue. That will help the glue penetrate into the wood, creating a stronger joint.

Don't use super glue.

I would make your bridge 45cm long. Don't try to make it just barely long enough, or just barely under 50cm.

You can find pictures of several bridge trusses here:
http://www.geocities.com/Baja/8205/truss.htm

You can start by making two sides. The hard part will be joining the two sides together. You need to make sure that the bridge is perfectly vertical, otherwise it won't hold very much.

Did any of that make sense?


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Fiona Scott
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 Sep-10-05, 00:24 AM (PDT)
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4. "RE: building a bridge school project"
In response to message #3
 
   Thank you very much for your help. We'll take on board what you said. Well it's off to the hardware shop now !!

Fiona


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sebastian
Charter Member
3 posts		 Dec-14-05, 05:01 AM (PDT)
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6. "RE: building a bridge school project"
In response to message #3
 
   >Well, I am sorry to say
>this, but I wouldn't recommend
>building a suspension bridge.
>
>A would recommend building a truss
>bridge out of wood. A
>lot of people use Balsa
>wood.
>
>As for glue, any common wood
>glue will work. Elmer's Carpenter
>wood glue works very well
>with Balsa wood. You can
>try adding a little bit
>of water to the glue.
>That will help the glue
>penetrate into the wood, creating
>a stronger joint.
>
>Don't use super glue.
>
>I would make your bridge 45cm
>long. Don't try to make
>it just barely long enough,
>or just barely under 50cm.
>
>
>You can find pictures of several
>bridge trusses here:
>http://www.geocities.com/Baja/8205/truss.htm
>
>You can start by making two
>sides. The hard part will
>be joining the two sides
>together. You need to make
>sure that the bridge is
>perfectly vertical, otherwise it won't
>hold very much.
>
>Did any of that make sense?
>how do i biuld a brige out of only elmers school glue and balsen wood?



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sebastian
Charter Member
3 posts		 Dec-14-05, 05:05 AM (PDT)
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7. "RE: building a bridge school project"
In response to message #6
 
   >>how do i biuld a brige out of only elmers school glue and balsen wood? and whats the best way you can bulid it? we also get 9 fet of balson wood.



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coj
Charter Member
 Sep-29-05, 10:44 AM (PDT)
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5. "RE: building a bridge school project"
In response to message #0
 
   the best way to construct a speghetti bridge is to boil your noodles, and die with food color. Good luck little buddy


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fhadeela
Charter Member
 Jan-19-06, 10:26 AM (PDT)
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8. "RE: building a bridge school project"
In response to message #0
 
   i have to build a bridge to hold weight could you please assist as how i can go about it


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