HOW TO ASSEMBLE COLUMN FORMWORK IN CONSTRUCTION
For large-scale projects or construction carried out on less than ideal ground, the use of formwork to shape the slurry concrete is indispensable. Therefore, the formwork assembly must be done correctly to ensure that the quality of the project is not affected. Today, we would like to share with readers how to assemble column formwork in detail, correctly, please follow the article!
1. What is column formwork installation?
Formwork installation is the process of assembling formwork panels together with connecting accessories. After completing the column reinforcement construction, the column formwork will be assembled. Depending on each type of construction, there are suitable formwork shapes such as rectangular, square, polygonal, circular, etc.
The structure of the column formwork is panels joined together with clamps. Currently, with the development of modern technology, panels are made from many different materials such as:
- Panel formwork is imported from Korea and is commonly used to make column formwork, beam formwork.
- Steel formwork.
- Aluminum formwork.
- Plastic formwork is often used in restaurants or townhouses.
2. The role of properly assembling column formwork
It is not for nothing that people use formwork in large projects or projects built in non-ideal soil. But because column formwork when assembled properly will bring benefits such as:
- Column formwork assembled to the correct designed size will have better resistance to the thrust of concrete.
- Proper assembly will limit risks during construction and ensure the safety of construction workers. If the assembly is not done properly, it will be very dangerous to the lives of workers. In addition, using formwork that does not meet quality requirements will have poor load-bearing capacity, easily collapse, leading to danger.
3. How to calculate column formwork accurately
Before assembling the column formwork, we need to calculate the cross-section and height in the most reasonable way and need to arrange according to a certain process.
- Calculate the height of the formwork: formwork = beam length - floor height. The column cross-section must be larger than the beam and the column needs to be calculated for its entire length.
- Calculate the formwork cross-section: Calculate the column cross-section must be smaller than the beam cross-section. Take the length minus the height of the beam and the floor calculated to the bottom edge of the beam to get the size of the column.
- Calculate the purlin and strut: Understand the load of the floor formwork and the weight of the purlin.
4. Detailed column formwork assembly method
Assembling column formwork is a relatively elaborate and complicated process, so when performing the method of assembling column formwork, it is necessary to follow these steps:
4.1 Preparation before assembling column formwork
In order for the construction to proceed smoothly, quickly and ensure the quality of the column as well as the project, it is necessary to prepare before performing the method of assembling column formwork.
- Carefully check the details of the formwork to ensure that they meet the technical requirements for each type of project.
- Measure and record in detail the measured parameters of the formwork as well as the assembly position to ensure the tightness of the formwork, avoiding loss of concrete water during pouring and compacting. In addition, it is necessary to ensure that the foot of the column formwork is placed in the correct position, firmly avoiding displacement that affects the structure of the column.
- Create and erect the formwork using the beam pouring method.
- Place the steel bars on the floor so that when needed, they can be used to anchor and connect the formwork panels together.
- Process the panels into pieces that fit the size of the column faces so that the panels can fit together tightly.
- Prepare steel or wooden clamps to shape the column formwork.
4.2 Proceed to assemble the column formwork
Usually, when assembling the column formwork, it will be carried out according to the following steps.
Step 1: Determine the position of the column center and column axis most accurately by using a parallel machine. When determining the position, place a wooden pad inside the foundation block to help fix the column foot.
Step 2: Pour the 50mm high column seed to create a template to build the formwork. Process into pieces with the same size as the column face, then assemble the pieces together and use steel or wooden clamps to fix.
Step 3: After the formwork is assembled according to the standards, the concrete will be poured
Concrete is poured into the formwork block through the pouring door or pouring chute.
The free fall height of the concrete when pouring must be lower than 2m to avoid the concrete mixture showing signs of solidification during the falling process, affecting the quality of the project.
Insert the rammer into the formwork block vertically, the depth of each layer of concrete when compacting is about 30cm to 50cm. This helps to compact the mixture more firmly.
An additional layer of cement mortar with a thickness of about 20cm can be poured at the bottom to overcome the porous condition of the column.
5. Some principles when performing column formwork assembly
To perform the correct and technical method of assembling column formwork, it is necessary to pay attention to some important principles:
- Determine the horizontal and vertical center position of the column, and draw the cross-section of the column on the ground in detail.
- It is necessary to fix the column foot with a wooden pad placed in the foundation block to serve as a formwork stand.
- Erect the boards in order from the inside out and ensure that the boards fit together, without gaps.
- Use a plumb line to check the straightness of the column formwork.
- When constructing the formwork, it must be done according to the design in the drawing and the instructions of the site engineer to avoid the case of the formwork collapsing, the concrete losing water after pouring, the structure changing, etc.
- The formwork when designed and constructed must ensure hardness, stability, cleanliness, and ease of disassembly and assembly.
The method of assembling column formwork is a useful method to help shape the concrete as designed and bring durability and solidity to the column as well as the construction. Therefore, this stage needs to be done carefully and strictly according to the correct procedure. Hopefully this article will help readers have a more general view of column formwork assembly and gain more experience when assembling.
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Source: Compiled from the Internet
