Description: 4 Span Deck Plate Girder Bridge
Prototype Information
Definition and use.
Engineering
- nomenclature of girder parts and pic side and inside use micro 50 foot bridge as example with red lines and lettering.
girders are slightly wider in spacing than the rails
Multi-span deck plate girder bridges are not connected to each other. The rails and end bearings on the top of the bridge pier hold the bridge in line. The end stiffeners transfer the weight of the bridge and the train down onto the bridge pier. The end stiffeners are mounted on pedestals which are used to .....
Plate steel riveted or welded to angle steel formed the sides of these
girder type bridges. These sides are fastened to each other by angles
and other shapes such as "I", "WF", "T" and channel shaped steel.These
fabricated beam types can either carry the deck on top or have the deck
pass between the sides.
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| Union Pacific 60 foot plate girder bridge |
The WWSL
I will be kit-batching the Satsop River bridge.
I have six Atlas Thru Plate Girder Bridges, each of them have 10 identically spaced steel plates.
- The prototype 21 panel plate girder bridges would be selectively compressed to 14 panels. To kitbatch this
bridge I need to add 4 panels. Total length of those two
bridges will be 25 inches.
- The 16 panel bridges would be selectively compressed to 10 panels. To kitbatch this bridge I need to shorten the height of the plate girders by approximately 1/3rd. Total length of those two bridges will be 18 inches.
Project Process
Step 2 Cutting the channel and constructing the bridge core
Step 3 Painting the Plate Girders
Step 4 Preparing and Attaching the Bridge Ties
Step 5 Adding Final Track Detail
Step 7 Assembling the Bridge
Construction
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Tool List Hobby table saw. Testors Cement |
Materials 1 - 3/4 inch aluminum trim channel 48 inches long (Hillman) 4-Evergreen 4x12 styrene strips |
Process Step 1
Construction - 10 panel deck plate girder bridge.
The intent is to kitbatch two 10-panel bridges by reducing the girder height relative to the 14-panel plate girder bridges.
Pic of Modification
- Cut the through plate girder bridge apart. I used a 3 inch table saw. (4 bridges)
- Sand the back to remove the knee braces. I used an 18 inch belt sander (8 panels).
- Cut the end plate from each end and save. I used a QEP Trim Shear tool for a quick, clean, sharp snip.
- Measure the plate girder depth and mark a line xxxx down the panel parallel to the base. Cut the plate girder panel at the cut line and sand the panel cut line smooth. I used double stick tape and a metal ruler to mark the line and then used a belt sander to remove the excess plastic. Remove any fused plastic from the sanding.
- Glue an Evergreen 4x12 strip to the bottom of the plate girder to replicate the rivet stiffener plate. Putty any gaps in the girder.
- Glue the end plates to each end. NOTE: The Atlas bridge rivet stiffener plate along the bridge end now becomes the bottom of the plate girder.
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Shorten the height |
Add bottom plate |
Replace end plates |
Construction - 14 panel deck plate girder bridge.
The intent is to kitbatch four 10-panel bridges into two 14-panel bridges.
Pic of Modification
- Cut the through plate girder bridge apart. I used a 3 inch table saw. (4 bridges)
- Sand the back to remove the knee braces. I used an 18 inch belt sander (8 panels).
- Cut 4 plate girder bridge panels at the x panel from the center as shown in the example and sand the c panel cut lines smooth. I used the Trim Shear tool for a quick, clean, sharp snip.
- Cut 2 plate girder bridge panels at the x panel from the center as shown in the picture above and sand the end panel cut lines smooth. I used the Trim Shear tool for a quick, clean, sharp snip.
- Check for square then align and glue the two end panels to either side of each center panel.
- Glue an Evergreen 4x12 strip to the bottom of the plate girder to replicate the rivet stiffener plate. Putty any gaps in the girder.
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Process Step 2 Channel Fabrication
- Utilizing 2 14-panel girders and 2 10-panel girders, layout the girder locations on the side of the aluminum trim channel. Leave a space of one bridge tie width between each plate girder.
- Mark the length on the channel and cut it with a hacksaw. Clean up any burrs with a file.
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Process Step 3 Plate Girder Painting
- Double stick tape girders in their proper position
- Spray 1 red primer
- Spray 2 black color
- Spray 3 black shadow color
- Remove plate girders from the aluminum core
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Process Step 4 Preparing and attaching the Bridge Ties
- Prepare the bridge tie strip for attachment and painting.
- Gently adjust the tie spacing as necessary. The Union Pacific Common Standard was 8 inches between ties.
- Flip the bridge tie flex track updide down and along the straight edge. Starting at the concrete abutment end, lay the ttachment and painting.See 4.1.9c Laying Bridge Ties for additional details.Add initial tie detail.
- Add additional bridge details as appropriate. See4.1.9C Bridge Details
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Attaching the Bridge Ties
- L-girder the length of the bridge
- upside down track
- glue on the ties1. Apply contact cement to top of aluminum channel. Center and attach bridge tie strip to top of aluminum channel. Clamp and allow to dry.
- center aluminum channel
- clamp and weigh down channel
- adding bridge guard rails and guard timbers
Process Step 5 Bridge Tie Painting
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Process Step 6 Bridge Assembly
2. Apply contact cement to side of aluminum channel. Identify the edge of the panel that does NOT have the xxxx and attach 14 panel girder to the side of channel and along bottom of the tie strip. Align end of girder to the edge of tie. Clamp and allow to dry.
3. Repeat step 2 with a 10 panel girder. Ensure a gap between the 14 panel and the 10 panel the gap between two ties. Clamp and allow to dry.
4. Repeat 3 with second 10 panel girder. Clamp and allow to dry.
5. Repeat 2 with second 14 panel girder. Clamp and allow to dry.
6. Turn aluminum channel and complete other side in an identical manner as 1-5 above.
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Process Step 7 Adding Final Track Detail
The assembly of bridge track on
aluminum channel is light, strong, and easy to move to the workbench for
detailing. I attached the girders to the side of the channel with CA.
Atlas Model Railroad Co., Central Valley, and Micro Engineering are
among the suppliers of these parts. Then I added other details to match
the prototype I was modeling.
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Process Step 8 Weathering
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