1. Formula for calculating column reinforcement during construction

To calculate column formwork accurately, workers need to arrange the steps according to a specific process. Once the preparation is complete, you can start using the available formula to calculate column formwork according to reasonable parameter adjustments:

Note:

• Calculating the height of the formwork requires taking into account the full length of the column and ensuring that the cross-section of the column is larger than the beam.
• Calculating the formwork cross section requires calculating that the column cross section must be smaller than the beam cross section. You subtract the height of the beam and floor from the length to the bottom edge of the beam to get the size of the column.
• Calculating struts and purlins: It is necessary to clearly understand the load of floor formwork as well as the weight of purlins.

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2. How to calculate column formwork during construction

How to calculate column formwork in construction with how to calculate purlins, struts and bottom formwork of formwork beams in construction is as follows:

- Calculate purlins and struts

Before entering the data into the calculation, you need to clearly understand the load directly affecting the purlin system as well as the struts, including the load of the floor formwork and the weight of the beam.

- Calculate formwork for the bottom of formwork beams during construction

To ensure the shape of the beam's bottom board, you need to fill in any gaps or shortages:

• Recipe: qtt = (q1 + q2 + q3 + q4) * 0,3 = 2622,9 * 0,3 = 786,87 daN / m2

- How to calculate the distance of purlins with durability conditions:

•  s = £ R*g (daN/cm2).
• Trong đó: W = 6,55 cm3 – Mômen kháng uốn ván khuôn có bề rộng bằng 300mm.

M – Mô men ở trong ván đáy dầm M =

Từ đó, có thể suy ra khoảng cách giữa xà gồ ngang là lxg = 60cm.

- How to calculate purlin distance based on deflection:

• Tải trọng tiêu chuẩn nhằm có thể tác dụng lên ván của khuôn trên 1m dài => qtc =
• Độ võng của ván khuôn được tính dựa vào công thức: f =
• Độ võng cho phép, trong đó:
  • E – Mô đun đàn hồi thép; E = 2,1.106 kg/cm2.
  • J –  Mô men quán tính bề rộng ván khuôn J = 28,46 cm4.

Kết hợp 2 điều kiện trên ta có thể chọn lxg = 60 cm.

3. Types of shaped column formwork in construction

Easy-to-understand definition of shaped column formwork for those who do not know. This type of equipment is necessary for the construction process. Formwork is made from many diverse raw materials such as bamboo, plywood, wood, etc. Or modernly includes plastic, aluminum, steel, etc. With the main use to firmly shape the body of the building in the first stage when workers start constructing the project. 

There are types of shaped formwork that you can refer to as follows:

• Round column formwork: This type of column is diverse in size, glass circles include 200mm, 300mm, 400mm, 500mm,... Depending on different uses. Besides, the main use of round column formwork is to help effectively shape concrete into columns. And walls for common construction projects,...
• Square column formwork: With a separate structure of 4 steel plates linked together to form deep square pegs. Has the effect of speeding up the concrete pouring process. In addition, at the top of each square formwork there are small round and square holes. For convenient assembly of beam formwork and easy cleaning after use.

4. How to properly close column formwork

Knowing how to calculate column formwork is extremely important, besides how to properly close formwork is also something that needs to be mastered. Accordingly, if you want to achieve the highest efficiency in your work, you need to follow these steps:

Step 1: Determine the horizontal and vertical center of the column and mark the column's cutting eye on the ground and floor surface.

Step 2: Formwork is constructed by fixing the column base with wooden cushions in the foundation block.

Step 3: Perform the construction of the inner arrays and then construct the outer arrays.

Step 4: Nail the connections of the 4 panels together and use the yokes to wedge them tightly.

Step 5: Next, use a rope to check the straightness of the column, heart, and anchor to help the column stay upright.

Step 6: In case the column is large, one side needs to be built first or a 3-sided formwork can be built.

Step 7: Finally, tighten the remaining sides after the reinforcement is completed.

During the construction process, you need to pay careful attention to calculating the parameters. To ensure proper technique of closing column formwork. Below are some notes or requirements about closing formwork as follows:

• Requirements for column formwork molds must be sturdy and tight. To prevent fresh concrete from flowing outside.
• Corresponding size, style, and position of the formwork compared to the design sample. This is to help workers create concrete that meets technical requirements.
• After closing the formwork, it is necessary to ensure installation, movement and reuse. Bearing force when the concrete structure has formed. 
• Standardized formwork design helps increase reuse.

Besides, the time for dismantling column formwork also depends on many factors:

• Beams with an aperture of less than 2m can be dismantled in 7 days.
• Beams with spans from 2 to 8m have a dismantling time of 10 days.
• Beams with apertures over 8m have a dismantling time of 23 days.

5. Introducing a reputable design & construction consulting service provider

The importance of construction units is undeniable because their reputation will ensure the quality and aesthetics of your project. Today, there are many units providing construction design services to meet the increasing construction demand in our country. Therefore, finding a reputable unit is not easy and requires you to spend time researching. During the selection process, you need to research carefully and ensure that the accompanying unit must have high professional qualifications, many years of experience, have a clearly signed contract, transparent costs,... Because Currently, according to feedback from some customers contacting Hung Nghiep Phu, there are many units impersonating construction design consulting companies to scam people for many different purposes. To help customers save time searching, Công ty TNHH Đầu Tư Xây Dựng Hưng Nghiệp Phú confidence will be the best choice for you.

Hung Nghiep Phu Construction Investment Co., Ltd. with the mission of bringing the best solutions and services, accompanying customers to build a prosperous community, Hung Nghiep Phu has been step by step affirming its brand. me. Trust through sincere cooperation, with a team of dynamic, creative, dedicated leaders with strategic vision. Hung Nghiep Phu owns a team of skilled and highly qualified staff who will bring customers the best quality projects.

Hung Nghiep Phu Construction Investment Company Limited - specializes in the construction of civil and industrial projects. We hope to be able to accompany customers in construction projects as well as legal procedures such as preparing planning documents, applying for construction permits, completing works, and applying for fire prevention and fighting certificates. ,... If you have any questions or are in need of designing and completing a project, please contact us immediately for a free consultation!

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