Prefabricated Concrete House Stair Assembly

The assembly of stairs for prefabricated concrete houses requires proper preparation and the selection of an appropriate assembly method, as detailed below:

Preparation Before Assembly

• Determine Installation Information: Clearly identify the installation location, length, and the starting and ending points of the stair assembly to provide basic data for subsequent assembly work.
• Stair Treatment: For stairs requiring assembly, perform a 'squeezing' operation by moving the central reinforcement bars as close to the sides as possible to reduce the stair's weight, facilitating easier handling and assembly. For stairs that need cutting, use professional cutting equipment for vertical cuts to ensure flat and perpendicular cuts, guaranteeing assembly quality.

Stair Assembly Methods

• Notch-Type Assembly: Leave notches at both ends of the stairs and insert the two stair sections into notches fixed on the ground or wall, followed by grouting. This method is suitable for walls or floors with certain load-bearing capacities, enabling a firm connection between the stairs and the ground or wall through the notches and grouting.
• Anchoring-Type Assembly: Use reinforcement bars and anchors to fix the two stair sections together, then fill the gaps with concrete grouting. This assembly method is suitable for stairs that require load-bearing capacity, with the reinforcement bars, anchors, and concrete grouting providing strong load-bearing capabilities.
• Connection Joint Assembly:
  • Resting-Type Stairs: There are two types: high-end fixed hinge support with low-end sliding hinge support, and high-end fixed hinge support with low-end fixed hinge support. For the former, the high end of the prefabricated stair has reserved bolt holes, with the lower part filled with high-strength grout and the top sealed with mortar; the low end also has reserved bolt holes, with the lower part using nut washers to form a cavity and the upper part sealed with mortar. For the latter, the high and low ends are treated the same, with reserved bolt holes filled with high-strength grout at the bottom and sealed with mortar at the top.
  • Anchoring-Type Stairs: There are two types: high-end fixed support with low-end sliding hinge support, and high-end fixed support with low-end fixed support. For the former, the lower longitudinal reinforcement bars at the high end of the stair are anchored in the stair beam, and the upper longitudinal reinforcement bars are anchored in the stair landing slab; the low-end sliding hinge support is the same as that of the resting-type. For the latter, the support structures at the high and low ends are the same, with the lower longitudinal reinforcement bars anchored in the stair beam and the upper longitudinal reinforcement bars anchored in the stair landing slab.
  • Connection Joint Selection: During the split design, select the appropriate connection joint based on the main structural calculation model. If the calculation model does not consider the diagonal bracing effect of the stairs, a low-end sliding hinge support joint can be used; if the diagonal bracing effect of the stairs needs to be utilized, a low-end fixed (hinge) support joint can be used. From the perspective of construction difficulty, resting-type stairs, which do not require supports, are more conducive to construction. Currently, many projects adopt the connection joint with a high-end fixed hinge support and a low-end sliding hinge support.