Pouring of Prefabricated Slabs for Houses

When pouring prefabricated slabs for houses, it is crucial to focus on two core aspects: the selection of prefabricated slabs and the production of cast-in-place strips.

Key Points for Selecting Prefabricated Slabs

1. Type Selection: Prioritize the use of "prestressed hollow slabs," which feature circular holes inside. These slabs ensure load-bearing capacity while significantly reducing self-weight, facilitating transportation and installation. Avoid using solid slabs due to their heavy weight, high cost, and poor seismic performance.
2. Quality Standards: Only use "national standard compliant products" and strictly prohibit the use of "non-standard slabs." Non-standard slabs may have issues such as insufficient steel reinforcement ratios and inadequate concrete strength, directly affecting structural safety.
3. Appearance Inspection: Carefully check for cracks, chipped corners, and other defects on the surface of the prefabricated slabs, especially ensuring that the concrete pouring at both ends is dense. If significant damage or honeycombing is found, replace the slabs immediately. It is recommended to purchase directly from local reputable prefabricated slab factories to ensure reliable product sourcing.

Specifications for Producing Cast-in-Place Strips

1. Location Requirements: Cast-in-place strips must be placed directly above load-bearing walls and cover all joints between prefabricated slabs. This is key to "locking" the dispersed prefabricated slabs into a whole through continuous concrete pouring, effectively preventing issues such as joint cracking and settlement.
2. Size Standards: The width of cast-in-place strips is typically controlled between 15-20 centimeters, adjusted according to building loads and design requirements. Too narrow a strip reduces connection strength, while too wide a strip may add unnecessary loads.
3. Construction Key Points: Before pouring, thoroughly clean dust and debris from the joints between prefabricated slabs to ensure full adhesion between the concrete and the slabs. During pouring, use a layered vibration process to avoid quality defects such as honeycombing and holes. After pouring, strengthen curing to prevent shrinkage cracks from affecting the overall structural integrity.

Supplementary Information

Most residential buildings constructed in China before 1985 used prefabricated slab structures. With advancements in construction technology, cast-in-place concrete and prefabricated buildings have gradually replaced traditional prefabricated slab houses. According to the renovation policies implemented in 2022, existing prefabricated slab houses are primarily repaired and renovated, with only buildings meeting hazardous house standards being demolished. If renovating existing prefabricated slab houses, it is necessary to commission a professional institution to conduct a structural safety assessment and carry out reinforcement work strictly in accordance with current regulations.