Prefabricated and assembled building technology is an innovative, green, and energy-efficient construction method that primarily utilizes prefabricated concrete structures. These components are assembled and connected on site to form the building. Today, we will discuss several important considerations to keep in mind during prefabricated assembly construction. Let’s explore these aspects together.
1. Installation and Construction of Prefabricated Stacked Balcony Panels
When hoisting balconies into place, attention should be given to the following four key points:
(1) Prefabricated balconies are lifted using four lifting rings embedded in the panels;
(2) During hoisting, pause the panel approximately 500mm above the working surface to adjust its position before continuing installation slowly;
(3) After aligning the control line and positioning the balcony panel, make fine adjustments to ensure it is level, then use a U-shaped bracket to adjust the elevation;
(4) Once installed, the balcony must be calibrated to guarantee installation quality.
2. Installation and Construction of Prefabricated Composite Panels
(1) Composite panels are lifted using modular lifting beams to ensure a slow, stable hoist;
(2) Pause the panel about 300mm above the working layer during lifting to adjust its direction carefully. Avoid collisions, stop steadily and slowly to protect the panel’s integrity;
(3) Temporary supports should be installed beneath the panel, spaced approximately 150cm apart. Each bay requires 2-3 rows of supports;
(4) For structural layer construction, double-layer supports must be used. Supports can only be removed once the cast-in-place concrete reaches at least 70% of its design strength.
3. Installation and Construction of Prefabricated Bay Windows
Bay windows are lifted using lifting ears, bolts, and reserved nuts. After connecting these components, the bay window is carefully moved into place, maintaining a 300mm gap from the working surface following the position line. When the bay window bolt aligns with the through-wall hole, place the custom U-shaped horizontal bay window spacer, then pull the bay window with a sliding rope to insert the bolt into the wall panel connection hole.
4. Installation and Construction of Prefabricated Staircase Boards
When installing prefabricated stair treads, pause the assembly about 500mm above the work surface. Adjust the direction of the stair treads carefully, and operate slowly to prevent damage caused by shaking or folding. Once roughly positioned, use a pry bar to fine-tune the alignment according to the control line, then weld and secure the stairs in place.
Key Point:
How to Perform Grouting in the Final Stage of Prefabricated Construction?
(1) The grouting material should be mixed on site. Begin by adding 80% of the water into the mixing bucket and mix for 3-4 minutes. Then add the remaining 20% of water, mix evenly, and allow the mixture to stand and release air before grouting.
(2) The grouting material should be used at temperatures between 5-40°C and protected from direct sunlight. Its initial setting time is approximately 15 minutes.
(3) Before grouting, cool the components that will directly contact the grout, typically by sprinkling water. This lowers the surface temperature and prevents the components from becoming too hot or dry, allowing the grouting to be completed efficiently.
(4) For winter grouting, the outdoor temperature must not fall below 5°C to ensure proper curing.
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