by With the vigorous development of modern industrial science and technology, building houses can also be standardized and manufactured in batches.
It is only necessary to transport the prefabricated standardized finished building components to the construction site for assembly to form a complete building, which is called prefabricated building.
Features of prefabricated buildings: 1.
A large number of building components are produced and processed in workshops.
The types of components mainly include: exterior wall panels, interior wall panels, composite panels, balconies, air-conditioning panels, stairs, prefabricated beams, prefabricated columns, etc.
2.
A large number of on-site assembly operations have greatly reduced the amount of original cast-in-place operations.
3.
The integrated design and construction of architecture and decoration are adopted.
The ideal state is that the decoration can be carried out simultaneously with the main construction.
4.
The standardization of design and the informatization of management.
The more standard the components are, the higher the production efficiency will be.
The corresponding component cost will drop.
With the digital management of the factory, the cost performance of the entire prefabricated building will become higher and higher.
5.
Meet the requirements of green buildings.
6.
Energy conservation and environmental protection.
After the above introduction, we believe that you have a preliminary understanding of prefabricated buildings.
As the future development trend of the construction industry, it is necessary to start learning about the construction process of prefabricated buildings as soon as possible.
In the next time, we will share the installation process of a prefabricated building every week, follow you to understand and learn about prefabricated buildings together.
In the first phase, we will introduce the installation of precast concrete columns in skeleton slab prefabricated buildings.
The installation of precast concrete columns.
The precast concrete is used to bind the steel bars of structural columns and pour concrete in the factory.
The bottom of the column is grouted with the steel bars reserved on the floor through the reserved holes.
At the same time, the top is also reserved with the steel bars, which are grouted or overlapped with the plates, beams and other components.
The specific installation process is as follows: 1.
Before the hoisting of precast columns, the laitance and debris in the binding layer should be cleaned up and the corresponding chiseling treatment should be carried out.
Processing the joint surface ▲ 2.
Surveyors shall set out according to the drawings and floor positioning lines, and set out the positioning lines of precast columns and the positioning control lines 200mm from the columns.
According to the positioning line, determine the installation position of the column and the control line ▲ 3.
Clean and position the reserved reinforcement, use the pre processed accurate reinforcement positioning frame to position the position and spacing of the reinforcement, straighten the skew reinforcement, and do not bend the reinforcement.
Check whether the position of the reserved reinforcement is accurate ▲ 4.
After the positioning of the reinforcement is completed, measure the level of the joint surface of the precast concrete column, and according to the measured data, place shims of appropriate thickness to level the lifting plane.
Determine the horizontal elevation of the joint surface ▲ 5.
Before hoisting the components, firmly connect the U-shaped clamp with the embedded lifting ring at the top of the column.
The prefabricated column shall be hoisted at two points 300 mm from the installation position to stop falling.
Hoisting and installation ▲ 6.
Use a mirror to ensure that the steel bars are correctly aligned with the holes.
After alignment, the lifting personnel will slowly lower the prefabricated column with their hands.
Plug in with the reserved reinforcement ▲ 7.
Install the support base at the reserved nut of the temporary support on the floor, and check whether the support base is firmly installed.
Use the adjustable support rod to temporarily fix the prefabricated column and the floor.
Each component shall be fixed with at least two diagonal braces, and installed on both sides of the component to ensure that the prefabricated column and the floor plane form a 90 degree angle after the installation of the diagonal brace.
Use a guiding rule to check and remove the hook after ensuring that the component is stable.
Install the diagonal support connecting piece ▲ Install the diagonal support ▲ 8.
The gap between the precast column and the floor shall be sealed with mortar, and the sealing shall be dense to ensure that there is no mortar leakage during grouting.
Then, plug up only one discharge hole and insert the grouting pipe for grouting.
There is only one grout discharge hole in the lower row to be plugged.
When the grout flows out in a column, the grouting hole shall be plugged.
Within 24 hours after the grouting operation, the connection between the component and the grouting shall not be subject to vibration or impact.
At the red line, the grouting liquid level ▲ is used to block all grout discharge holes ▲ Installation is completed ▲ Above ▲ is the installation process of prefabricated concrete columns in the framework plate assembly type building.
In the next section, we will continue to share the installation process of the framework plate assembly type large storey PC column segmental prefabrication (column column connection).
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