figure. The building has reinforced concrete slab from ground floor to the roof floor. The main dimensions, structural features, loads, materials etc. are also set out below. Calculate the slenderness of the column at B/2 on Ground floor and classify the column whether slender or non-slender (short). The column is considered. Feb 06, · Constructing RCC (Reinforced Cement Concrete) Column involves following four stages of works – Column layout work. Column reinforcement work. .
The reinforced concrete column is an important type of concrete element in a concrete building, especially a high-rise structure. It is highly recommended that in a building project, the design of concrete columns should be prioritized before the design of other concrete elements. Perhaps you have noticed that there have been some concrete buildings which collapsed during their construction, and this may have happened because of design failure or lack of proper supervision. There are many possible reasons why reinforced concrete structures collapse during their construction.
Therefore, it is vital to check every detail of a column before it is cast with concrete. Extra care should be taken during the inception of reinforced concrete column construction. It is advisable to employ qualified construction staff such as a site structural engineer, a technical engineer, a construction manager, a project engineer and site engineer as these are the first experts on hand to check the soundness of the building design and eventually its on site application, in order to ensure the integrity of a completed finished product concrete element.
Qualified site crews are also required to do several critical tasks on site, especially concrete columns.
The foreman, chargehand and steel fixers should have gained enough experience before they can be authorized and chosen to do the job what is the best contrast ratio for a projector constructing vertical reinforcements, as it requires a highly knowledgeable team to interpret every detail of the structural plan.
So, to obtain a high-quality reinforced concrete column, here are 17 steps to follow for the construction of the concrete column. Check the structural plan and install the reinforcing bars. Ensure that the proper bar diameter, grades of steel, and spacing are all inclined as per plan. Check which other trades like the electrical, sanitary, plumbing and mechanical trades are to be embedded along the column.
If applicable, have them installed before the installation of formworks. Make sure that the openings of other trades are completely protected and closed from the wet concrete during the actual pouring. Check the plan and install the formworksproperly braced, and tightened with the approved accessories and how to get taller biceps. If how to build a reinforced concrete column, a professional like a formworks engineers should certify that the formworks installed are credible enough to carry the load brought by the wet concrete and the pressure of the concrete pump if pump is to be used.
Ensure that the plumb line is in-place on two adjacent sides. As a quality engineer or consultant, you have to check using steel tape if the plumb line is parallel to the column as it will show verticality. Check the coordinates. Have the survey team check the placement of installed column formworks with respect to the gridlines to avoid deviations.
Double how to copy a security dongle if necessary. Ensure that the installed formwork is clean and free from laitance.
Recheck if all the dowels, electrical, sanitary and plumbing provisions have been installed alongside with the formworks to avoid chipping work and rectification later on. Prepare or batch the concrete. Concrete may how to draw anthro birds ready-mix concrete or in-situ mix. Recheck the designed how to build a reinforced concrete column needed and required for the structure.
Should the concrete be in situ mix, make sure that the cement and aggregate mixtures is premium so as to get the designed strength. Collect samples for maturity testing. Normally, eight cube or cylinder samples are taken for a 7 day and a 28 day compression test, including spares. Check whether slump and temperature are in line with what was designed.
Approved admixtures may be added as per specifications. The inner surfaces of the formwork should be thoroughly wet, and free from laitance and deleterious substance before pouring fresh concrete. For the actual casting, introduce the concrete continuously. A quality inspector must ensure that the concrete is cast as smoothly as possible and avoids the considerable height difference that promotes aggregate segregation.
It is advisable to use steel chutes or plywood portable chutes whenever necessary. A quality inspector shall make sure that no concrete is used that has already hardened or does not meet the required quality control limits. Concrete pumps must be lubricated using grout before starting the work.
Grout shall be of 1 to 2 cubic meters of quantity. If the weather will not permit the ongoing concreting works, a proper construction joint should be set up as per specs, and at the location where the stress is minimal. Check the structural plan and specs for reference.
Whenever you can, avoid cold joint parts by putting the concrete in layer by layer, while the concrete continues to be in plastic form. Take away the temporary spreader if used in the formworks when the concrete placing has already reached the elevation of the spreader. The concrete should be compacted using a mechanical vibrator.
Avoid vibrating reinforcement and steel reinforcement for no reason should they be permitted to cause aggregate segregation. Provide a spare vibrator in case the one breaks down, to ensure the concrete pouring can continue.
For an in situ mix, place the concrete as soon as possible. After the concrete has settled and has attained its allowable strength on the specified day the safe stripping or removal of formworks may commence. Should there be any defect or noticeable bulges or honeycomb after the removal of formworks, it should be rectified by means of chipping, grinding or any approved tools.
Burlap clothes or any approved similar materials are to be used for the reinforced concrete column curing. This is to ensure that the column will attain its designed strength at the right time.
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Apr 15, · Columns and Beams. The design of reinforced concrete columns and beams is very important to provide structural strength to a building and particularly to withstand earthquakes and other natural disasters. Here we look at the design of columns and beams the placement of the concrete and steel and how these give structural strength.
Home About Contact. C Column? Anre August 19, The construction of a reinforced concrete column R. C Column involves mainly 4 steps. This includes column layout preparation, column reinforcement work, column formwork and Concrete Pouring into the formwork. We will discuss each step in detail in the below section.
Concrete Column Construction Steps The steps included in the construction of reinforced concrete column are:. Column Layout Preparation In this stage, grid lines are drawn through the building plan and the location of columns are marked on the plan.
The same arrangement is followed on the site, where ropes are used to represent the gridlines in the actual building plan gridlines. The final location of the column is related to the arrangement of the ropes. Once the location of the columns is made and marked on the ground, the next step is to prepare the column reinforcement.
The details of column reinforcement i. The cross-section of the column, the number of longitudinal bars, the number of lateral ties Stirrups , the spacing, tie bars, etc are obtained from the structural drawing of the respective column. After making the reinforcement cage, it is enclosed within a form or so-called molds in order to support the poured concrete.
These forms or molds have to be supported until the shuttering process removal of forms. The arrangement used to support these form structures are called as formworks. It can be a simple form like a reinforced cardboard tube or very complex forms like the use of many pieces of wood and metal. Machine mix concrete is mainly preferred for small quantity concrete pouring works. For large quantity works, ready mix concrete is employed.
The concrete must not be poured at a height not more than 5 feet. This consideration will make a choice between different concrete pouring procedures.
The time of removal of formwork for concrete column members ranges from 24 to 48 hours. This is mainly dependent on the:. Concrete column once after the shuttering process is cured for a period of 7 days which helps in acquiring a strength 50 percent greater than uncured concrete.
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