Brief overview of adjustable steel columns

Adjustable steel columns alias screw jacks or beam jacks, belong to hollow steel posts. The purpose of these columns is to provide strong support to the structure. A secured adjustable steel column threaded adjustment mechanism is employed to alter the height of the post with the help of a big screw.

They are frequently utilized in basements.

They are constructed as multi-part assembles, often known as telescopic steel columns, or as single-piece columns.

When a column is applied or set up improperly or its condition is damaged, the column becomes insecure. General faults occur due to persistent utilization of temporary columns, inappropriate installations and extreme exfoliating rust, all of which can cause abrupt collapsing of the column as well as the structure it supports. As a result injury and property damage will occur.

The following are possibly faulty conditions:

The diameter of the post remains under 3 inches as per 2006 International Residential Code (IRC), Section R407.3. Poles which remain under 3 inches go against the IRC, although they are not inevitably faulty. A 2½-inch post is sufficient to support the load over it, whereas a 4-inch post can buckle when the load goes beyond the structural strength of the post. Structural engineers normally take decision whether adjustable steel posts contain equivalent size.

Rust-inhibitive paint is not applied to safeguard the post. The IRC Section R407.2 defines:

All surfaces (interior and exterior) of steel columns should be provided with a shop coat of rust-inhibitive paint, exclusive of corrosion-resistant steel and steel treated with coatings to provide corrosion resistance.

Inspectors are unable to recognize paint as rust-inhibitive. In dry climates where rust is not happen, rust-inhibitive paint should not be applied. Visible signs of rust represent a possible deficiency.

The post is not straight. It should be checked that the highest lateral displacement among the top and bottom of the post should not go beyond 1 inch. However, endurable lateral displacement is influenced by several factors, like the height and diameter of the post. The post should not bend at its centre. Bending implies that the column is unable to endure the weight of the house.

The column is not mechanically attached with the floor. An inspector can’t identify whether a connection among the post and the floor subsists if this connection is wrapped with concrete.

The column is not attached with the beam. The post should be mechanically attached with the beam over to add extra resistance capacity against lateral displacement.

In excess of 3 inches of the screw thread are uncovered.

Cracks exist in upstairs walls. This condition may lead to the failure of the columns.

The following types of adjustable steel columns are commonly found - Single Piece Adjustable Columns, Telescoping Adjustable Columns

To learn how set up a adjustable steel column, go through the following link www.thespruce.com



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Published By
Rajib Dey
www.constructioncost.co
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Some crucial technical drawings terms in construction

Given below the details lists of technical drawings terms essential at construction site.

1. Tender drawings: These types of drawings are provided to the bidders at the tender time to estimate the blank BOQ. It should be studied in accordance with specifications to exact pricing of the BOQ. As for instance, sometimes supports are not cited in tender drawings but if it is given in specification, bidder should take the cost of that supports into consideration at the time of estimating the specific item.

Tender drawings & specifications play an important role in the post contract phase to manage variations.

2. IFC Drawings: It is the abbreviation of “Issued for construction”. This type of drawing is submitted by the consultant for construction purposes and formation of shop drawings to the contractor. Sometimes, the drawings are circulated for reference and information purposes. They are called as “Issued for reference” (IFR) and “Issued for Information” (IFI) respectively.

3. Architectural Drawings & Structural Drawings: These two drawings are responsible to determine the strength of the construction. Generally, the architects create the architectural drawings and the structural engineers create the structural drawings. Mainly, the architects put the client’s requirement into paper. Structural engineers take the responsibility to check that the architect’s design is structurally secure. Both the drawings are dependent on each other.

4. Interior Design Drawings (ID drawings): It offers the details or the interior structure of the construction project. For the commercial building projects it is very important. To provide standard interior to the project, exact coordination with other trades is essential.

5. Shop drawings: It is arranged by the service provider as well as sometimes by Sub-contractor or supplier. The shop drawings provide proper guidance to the people who are executing the actual work at the construction site.

It contains more details as compared to other construction drawings. When MEP Sub-contractor creates shop drawings, he has to submit the IFC, ID drawings, Architectural Drawings & Structural Drawings to make the coordination perfect.

6. Request for Information (RFI): It is extensively applied in construction industry. While generating the shop drawings, if the contractor detects any inconsistency, he should inform it to the consultant for modification. It is called as RFI. The response should be utilized for the continuous process.

7. As-built drawings: The contractor arranges these drawings as soon as the works at construction site are completed. These drawings indicate the actual construction of the project. These drawings are utilized for the final account purposes and the maintenance purposes.



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Published By
Rajib Dey
www.constructioncost.co
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