Real Mini Long Flyover Construction ( Part 1 )

A miniature concrete flyover is a scaled-down version of a real flyover, designed mainly for decorative and model-making purposes. It can be used in gardens, landscaping, model train layouts, and architectural displays.

The flyover can include realistic details such as beams, columns, railings, and road surfaces, making it look like a real-world structure on a smaller scale.

In this project, we’ll create a miniature concrete flyover using simple construction techniques and realistic details, making it a great addition to any miniature landscape or display.

Materials Required

To build the miniature concrete flyover, you’ll need the following easily available materials:

1. Sand
2. Cement
3. 1 mm Steel Wire – for reinforcement
4. Sunboard Sheet – for making the formwork
5. Fevi-Quick – for assembling small parts
6. PVC Pipe – for making columns or other structural parts
7. 0.2 mm Wire – for detailed reinforcement and railings
8. Tweezers – for handling small parts
9. Mixing Container and Stirring Stick – for preparing the concrete mix
10. Trowel – for placing and finishing the concrete

A typical flyover consists of several important structural parts:

1. Foundation – Supports the structure and transfers its load to the ground.
2. Pillars – Vertical supports that carry the flyover deck.
3. Flyover Deck – The surface where vehicles travel.
4. Girders – Structural beams that support the deck.
5. Railings/Parapets – Safety barriers along the edges.

For this miniature model, some structural parts such as bearings and detailed foundations are simplified or omitted.

Preparing the Pillar Location & Excavation

Mark the locations for the flyover pillars according to your design. Use a shovel, pipe, or similar tool ( I use machine ) to make holes at the marked points. Make the holes slightly wider than the pillar bases so they can be positioned properly and secured with concrete.

Column Reinforcement

Place the vertical 1 mm steel wires inside the column formwork and position them evenly. Add the horizontal round reinforcement and secure it to the vertical wires using 0.2 mm wire and tweezers.

Repeat the same process for all six columns, making sure the reinforcement is properly aligned and securely fixed before pouring the concrete.

Making the Column Formwork

Use 2.5-inch PVC pipe to make the column formwork. Cut the pipe to the required length (20 cm total: 15 cm column + 5 cm base) and split it vertically into two pieces.

Join the two halves to form a cylindrical shape and secure them firmly so they do not move during concrete pouring.

Repeat the same process for all six columns.

Making the Flyover Beam Formwork

For the flyover beam, use Sunboard sheet to create a simple formwork.

My beam dimensions are 25 cm (L) × 7 cm (W) × 7 cm (H).

1. Measure and mark the required dimensions on the Sunboard sheet.
2. Cut the sheet to make the bottom and side panels of the formwork.
3. Assemble the pieces into a box-shaped form using Fevi-Quick.
4. Check that all sides are straight, properly aligned, and firmly secured before pouring concrete.

Make the Concrete Mixture

1. Mix cement and sand thoroughly in a container until they are evenly combined.
2. Gradually add water while mixing. Avoid adding too much water, as a runny mixture can weaken the concrete.
3. Continue mixing until you get a smooth, workable consistency.

Pouring the Concrete

Slowly pour the concrete mixture into the formwork, making sure it fills all areas around the reinforcement.

Gently tap or vibrate the formwork to remove trapped air bubbles and compact the concrete. Smooth the surface with a trowel and allow it to cure properly.

Curing and Removing the Formwork

Allow the concrete to cure inside the formwork for 2 days.

After curing, carefully remove the formwork to reveal the miniature flyover beam. Take care not to damage the concrete while removing the panels.

Your miniature concrete flyover beam is now ready for the next step.

Making the Flyover Deck Formwork

Plan the flyover deck according to your required size and design. Cut the Sunboard sheet to the desired dimensions and assemble it into a formwork.

Seal all joints properly to prevent concrete from leaking. Apply a thin layer of oil to the inside surfaces; this will help release the concrete after curing.

Place the formwork on a flat and level surface and make sure it is stable and securely supported before pouring the concrete.

Deck Reinforcement

Reinforcement helps improve the strength and durability of the miniature flyover deck. For this project, use 1.5 mm wire as reinforcement.

Arrange the wires evenly across the deck and maintain the required spacing:

1. Horizontal spacing: 2 cm
2. Vertical spacing: 4 cm

Secure the reinforcement properly so it stays in position while pouring the concrete. Make sure the reinforcement is evenly distributed throughout the deck for better strength.

Scaffolding for the Flyover Deck

Scaffolding provides temporary support for the flyover deck while the concrete is being poured and cured.

Use lightweight but sturdy materials such as wooden sticks, dowels, toothpicks, or small metal/plastic rods.

Place the vertical supports evenly along the length of the deck and make sure the scaffolding is stable and properly aligned before pouring the concrete.

Pouring the Concrete Deck

Mix cement, sand, and water to achieve a workable concrete consistency.

Slowly pour the mixture into the deck formwork, starting from one end and moving toward the other. Spread it evenly with a trowel and gently tap the formwork to remove air pockets.

Fill the formwork completely, then use a straight edge to level the surface with a back-and-forth motion. Finally, smooth the surface with a trowel for a clean finish.

Curing and Removing the Formwork

Cover the freshly poured concrete with plastic sheeting to retain moisture and help with proper curing. Allow it to cure for 24–48 hours before carefully removing the formwork.

Once the concrete has hardened, gently remove the formwork and inspect the flyover deck for rough edges or imperfections. Make any necessary touch-ups with a small amount of concrete or patching material.

The miniature flyover deck is now ready for the next stage.

Entry and Exit Ramps

Create a gentle slope at both ends of the flyover to provide a smooth transition from the ground level to the flyover deck.

Use Sunboard or another suitable material to make the ramp, and gradually increase the height toward the deck. Make sure both the entry and exit ramps are properly aligned and have a smooth, even slope.

Making the Column and Entry Ramp

In this design, the flyover is supported by one concrete column, with a sloped entry ramp leading from the ground to the flyover deck.

Mark the position of the column according to your design. Make sure it is properly aligned with the flyover deck.

Cut a 2.5-inch PVC pipe to 15 cm (10 cm column + 5 cm base) and split it vertically into two halves. Place the halves around the reinforcement and secure them firmly in position. Cut the Sunboard sheet to the required dimensions and assemble the pieces into a box using Fevi-Quick. Make sure the box is straight, secure, and leak-proof.

Mix cement, sand, and water, then slowly pour the concrete into the Sunboard box. Tap the formwork gently to remove air bubbles and level the surface with a trowel.

Allow the concrete to cure for 24–48 hours. Carefully remove the Sunboard formwork and clean up any rough edges.

Now follow the previous deck steps for the sloped deck:

1. Step 4: Deck Formwork , Deck Reinforcement , Provide Support

Now follow the previous deck steps for the sloped deck:

Step 5: Pour the Deck Concrete , Cure the Deck and Remove the Formwork

Watch Full Video :

This completes Part 1 of our Miniature Concrete Flyover. In this part, we built the main flyover structure, including the column, deck, reinforcement, formwork, and entry ramp.

But the project doesn't end here! In Part 2, we will build another flyover crossing over this one, creating an X-shaped flyover intersection when viewed from above.

Stay tuned for Part 2!