Layout of Prefabricated Composite Floor Slab Houses

When laying out lines for prefabricated composite floor slab houses, it is essential to focus on the setting of layout holes, the condition of steel bars within the layout holes, and the impact of electromechanical reserved embeddings on the layout. The specific key points are as follows:

The setting of layout holes is a fundamental aspect of the layout work. The positions of the layout holes should be planned during the early design stage of the composite floor slab sections and completed simultaneously by the manufacturer during detailed design. It is recommended to set the layout holes on the composite floor slabs, where the manufacturer can pre-embed water stops with a diameter of 110mm, which can meet the layout requirements and effectively prevent leakage. The positions of the layout holes should avoid wet areas, such as balconies and bathrooms, as these areas require waterproofing treatment later, and the presence of layout holes may damage the waterproof layer. It is advisable to set the layout holes in public areas, such as corridors or living rooms, so that interior decoration can proceed concurrently before the layout holes are sealed, improving construction efficiency.

The condition of steel bars within the layout holes directly affects the structural safety of the composite floor slabs. Prefabricated composite floor slabs are usually equipped with steel bars, but steel bars are generally not set within the layout holes. This is because the layout holes are through-holes in the entire composite floor slab, and setting steel bars within the holes would disrupt the overall load-bearing performance of the slab, leading to local stress concentration and increasing the risk of cracking and deformation. Therefore, the design of the layout holes should be coordinated with the layout of the steel bars in the composite floor slabs to ensure enhanced treatment of the steel bars around the holes to compensate for the impact of the holes on structural strength.

The impact of electromechanical reserved embeddings on the layout should be strictly controlled during the detailed design stage. The prefabricated slabs of composite floor slabs require reserved electromechanical openings and embeddings, the accuracy of which directly affects the processing and production of prefabricated components and construction installation. If the design height of the truss steel bars is incorrect, or if electromechanical wire boxes are missing or misaligned in their embeddings, it will result in inaccurate positioning during layout and may even require on-site opening or adjustment of the embeddings, increasing construction difficulty and cost. Therefore, the detailed design of electromechanical reserved embeddings should closely cooperate with the architectural and structural disciplines to ensure that the positions, dimensions, and elevations of the reserved embeddings meet the design requirements and avoid affecting the layout and subsequent construction due to design errors.

In summary, the layout of lines for prefabricated composite floor slab houses should be comprehensively controlled from three aspects: the setting of layout holes, steel bar treatment, and electromechanical reserved embeddings, to ensure layout accuracy and construction safety.