How to Make a Prefabricated House Roof Template

The prefabricated house roof template can be made by referring to the room ceiling formwork procedure. The specific steps are as follows:

Step 1: Shear Wall Positioning
Use an impact drill to drill holes at predetermined positions and insert steel bars for positioning, or weld positioning steel bars through electric welding. Then install the shear wall formwork and temporarily do not reinforce it after closing the formwork. This step requires ensuring that the perpendicularity and spacing of the positioning steel bars meet the design requirements to avoid subsequent construction deviations.

Step 2: Scaffolding Erection
Taking steel pipe coupler scaffolding as an example, determine the positions of the upright steel pipes according to the room size, keeping a distance of about 300mm from the shear wall. The spacing between upright steel pipes should not exceed 1.2 meters and should be evenly distributed. Pull horizontal steel pipes at a height of 1.8 meters to form a stable support structure. The scaffolding needs to bear the load of the ceiling formwork and concrete pouring, so the connections between steel pipes must be firmly coupled to avoid loosening.

Step 3: Leveling and Beam Bottom Installation
Based on the one-meter construction line provided by the line setter, use a level to mark the elevation on the upright steel pipes. Install the beam bottom pipes according to the marked lines, correct and fix the beam bottom formwork, and then install the beam side formwork (beam flange plates). This step requires strict control of the beam bottom elevation and levelness to ensure that the roof slope or flatness meets the design requirements.

Step 4: Installing Main Beams and Wooden Battens
Make main beams according to the room size, using two steel pipes with a diameter of 5 centimeters placed side by side as the main beams. Lay wooden battens evenly on top of them, with a spacing of no more than 250mm. The main beams and wooden battens need to be closely fitted to avoid local uneven stress causing formwork deformation.

Step 5: Laying Plywood
Measure the diagonal length of the room to ensure that the four corners of the room are right angles before laying the plywood. The plywood needs to be tightly spliced and have a flat surface to avoid concrete leakage or an uneven surface during concrete pouring.

Step 6: Reinforcing Shear Walls and Preparing for Concrete Pouring
Fix the upper opening of the shear wall according to the size with nails and align the lower opening with the construction line through positioning steel bars to ensure perpendicularity. Use steel pipes with a diameter of 5 centimeters to reinforce the shear wall. The bolts are sleeved with plastic pipes for reuse, and five bolts are set for a floor height of 2.9 meters. The ceiling and shear wall formwork need to be reinforced at one time, and then concrete pouring can be carried out.

Alternative Solution: Steel Formwork Support Structure
If using steel formwork support, first erect a steel formwork support system, use steel formwork (or wooden boards) to support the roof area, lay steel bars and fix them, set up barriers around the roof, and finally carry out concrete pouring. This method is suitable for scenarios with high requirements for formwork strength, but attention should be paid to the splicing accuracy and support stability of the steel formwork.