How to Make Prefabricated Roof Covering for Houses
The methods for making prefabricated roof covering for houses vary depending on the scenario and craftsmanship, with common approaches including simple rural hoisting, constructing a base layer with prefabricated concrete blocks, and prefabricated panel ceiling installation, as detailed below:
In rural house-building scenarios, due to limited equipment, laborers have historically used simple tools to hoist prefabricated panels. A single prefabricated panel can weigh two to three tons. Without a crane, a steel pipe is used as the main tool, employing the principle of leverage or a pulley block system to gradually hoist the concrete panel to the roof installation position. This method relies on the coordination of manpower and simple machinery, requiring multiple people to work together. It also demands high precision in on-site space management and operation, necessitating careful planning of the hoisting path to avoid collisions with walls or other structures.
From a construction craftsmanship perspective, when foreign workers construct the roof base layer using prefabricated concrete blocks, they enhance stability through structural design. Specifically, precision positioning protrusions are designed on both sides of the blocks, which, together with two pre-laid rows of wooden planks, form a bidirectional ribbed beam structure. Gaps are left between the ribbed beams to accommodate the thermal expansion and contraction of materials, preventing structural cracking due to temperature changes. During installation, the block protrusions precisely interlock with the ribbed beams, ensuring overall stability through mechanical interlocking without the need for excessive adhesive materials. This approach improves construction efficiency while guaranteeing the durability of the structure.
If using the prefabricated panel ceiling installation method, special attention must be paid to protecting the prestressed reinforcement. Taking round-hole panels as an example, the operation steps are as follows: First, locate the center of the round-hole panel's holes and use a hammer to open a hole approximately 80 millimeters long and 40 millimeters wide. Insert a steel bar approximately 200 millimeters long and 14 millimeters in diameter into the panel hole as the main load-bearing component. Next, fabricate a wooden block measuring 40 millimeters by 40 millimeters and approximately 150 millimeters long, and securely bind it to the steel bar using No. 8 lead wire to form a stable connection node. Finally, connect the main joist to the wooden block using hangers and arrange the hanging points reasonably to ensure uniform load distribution. This method avoids directly damaging the prestressed reinforcement in the round-hole panel through indirect fixation, thereby ensuring the safety of the structure.
