Trestle Bridge (triple tier)
Check all parts are present. - You should have
3 x full size trestle tower assembly
2 x reduced size trestle tower assembly
1 x track bed
1 x track girder support
1 plastic bag cont. 10 pieces track plank
1 plastic bag cont. 2x retaining wall
Remove excesses and file/sand where necessary.
If you have a trestle bridge construction kit refer to the following instructions under trestle bridge construction kit. (These instructions and the kit refers to the fixing of the trestle towers to the track girder support. The kit creates a difficult task into and easy task and is recommended.
Instructions using construction kit
Place girder support on work area with beams facing up. Use a pencil to mark the length-ways centre of the girder then every 42mm. you should have five marks. From the construction kit place a cradle either side of the girder support. At the base of each cradle there is a lug that must face toward the girder. The cradle base plate sits flush against the girder. Place the two plates across the girder into the slots of the cradle and form a free standing frame. Starting at the centre mark place the cradle frame in line with the mark and slide a full size trestle tower inside the cradle frame. Position the tower onto the track and within the lugs on the cradle base. Check for square. Once happy with the position glue. Take care not to glue the cradle frame to the girder. Let set.
Once 1st tower is set in position move cradle frame to next 50 mm mark and repeat. The three full size towers are the centred three with the a smaller tower at each end.
Instructions without kit
Place girder support on work area with beams facing up. Use a pencil to mark the length-ways centre of the girder then every 50mm. you should have five marks. Starting at the centre mark place a full size trestle tower across the track . Use what ever means you can to hold in position and glue. Be sure to have the trestle tower assemble square and centred. Let set.
Once 1st tower is set in position move to the next 50 mm mark and repeat. The three full size towers are the centred three with the a smaller tower at each end.
At each end of the girder a retaining wall is also glued. Place the retaining wall in a central position and glue. Paint.
We are now going to prepare the track bed. The track planks sit edgewise on the deck of the track bed to create a border for the track. Place track bed on work area face up. Have a small piece of track sitting on the bed to indicate where the planks should be installed. Start at one end - have two planks positioned edgewise either side of the track with a little room to spare. The first end planks should hang over the track bed by 10mm to help position the finished product onto your layout. Glue the planks into position along the bed using the piece of track as a guide. At the other end the end planks should also hand over the bed for the same reason as before. Paint
Position the bed assembly and the trestle tower assembly and glue the two togeather.