Steel – Erection
Steel erection is one of the top 10 most hazardous occupations according to BLS fatality data year after year. Steel erection work includes heavy duty high rise structures, metal buildings and even signs. Steel erection is often the skeletal core of bridges, office buildings, commercial, retail and industrial structures. OSHA published Subpart R, 1926.750, the current steel erection rule in 2001.
What does it mean to erect steel?
Steel erection means constructing buildings with steel that means the major part of the building is steel. Steel beams will be used in for concrete beams. The steel erection helps the designer to build the building in any design. The builder can make moldings, bent etc with the steel. By using the builders can complete their work very fastly. It is not time-consuming when it started. cranes play a major role in the steel erection because the lifting of steel is done with the crane. Using steel erection the builders can build both big buildings and hangars. The building can easily modify at any time because it is made up of steel. The builder can bend, weld, cut anything can do with steel. Steel is a stronger material, it is durable for long periods. Completion of work can be done very quickly with the help of steel erection.
How to Erect a Metal Building
There are numerous steps involved in erecting a metal building. While the process can be seemingly tedious and confusing at times, completing each one of these steps is essential to the assembly of your metal building. Before you decide to purchase a turnkey metal building, you should be aware of the steps involved in erecting it.
The foundation is one of the most important elements of erecting your metal building. You will need to view the instructions to find out where your anchor bolts will go. You will need your slab of cement to be completely flat so that the bolts will be easily found.
Step 2: The Frame
The first part of the framing process begins with the I-Beam columns and the rafters. As these buildings are “pre-engineered,” all of the pieces will be pre-cut, punched, and welded for you. These beams are going to be the heaviest and most essential pieces to the construction of your metal building.
Step 3: Girts, Purlins, and Framed Openings
Once you get the main frameworks up, you can then start to add the girts, purlins, and framed openings that give more support to the walls and roof.
Step 4: Roof and Walls
By this point, most of the framing should be completed. From here you can start to focus on the insulation, walls, and roof sheeting. Simply screw the sheeting into the frame using the fasteners. After the walls are done, you can focus on the roof panels, where you can also remember to include the weather stripping.
Step 5: Aesthetics
The last step in erecting your metal building is adding all of the bells and whistles. This would include any of the trim, accessories and other metal building design options that you purchased. The trim will not only allow your building to look finished, but it will also help to keep the building free of leaks. Lastly, you will add any doors, windows, and vents so that your building is complete.
How much does it cost to erect a steel building?
Steel buildings cost anywhere from $5-$10 per sq ft for the building kit components.
Square foot prices reduce as the overall building size increases (see table below).
Another factor that will keep the price down is if you choose standard size buildings such as: 30’x40′, 60’x40′, 50’x80′, 50’x50′ 60’x100′, 80’x100′ etc. (as opposed to irregular sizes 33’x47′ etc.)
Example Square Foot Building Costs:
|Building Size (ft)||Square Footage (SF)||Estimate Cost||Cost / Square Foot|
What is Fabricated doing steel erecting ?
- steel beam -Beams include purlins, girts and horizontal tubes that bolt . Some beams is required cutting and welding depending on the print that given specs. Below is more info about beams and the fabrication.Attach beam to supporting structure using a sufficient number of bolts or sufficient amount of weld to ensure the structural integrity before weight of load is placed on the connection plates.Ensure columns have sufficient lateral support before installing members, such as crane beams, girts, and outriggers, which could cause the column to be eccentrically loaded.Once load line on the crane has no weight, check the structural stability of the member. If it’s secure, release choker from beam. If required, add additional temporary bracing to secure the member before releasing crane hoist.During the final placing of solid web structural members, the load should not be released from the hoisting line until the member is secured with at least two bolts per connection, wrench tight. Secondary member must have one bolt wrench tight.
- Purlins -In steel construction, the term purlin typically refers to roof framing members that span parallel to the building eave, and support the roof decking or sheeting. The purlins are in turn supported by rafters or walls. Purlins are most commonly used in Metal Building Systems, where Z-shapes are utilized in a manner that allows flexural continuity between spans.Steel industry practice assigns structural shapes representative designations for convenient shorthand description on drawings and documentation: Channel sections, with or without flange stiffeners, are usually referenced as C shapes; Channel sections without flange stiffeners are also referenced as U shapes; Point symmetric sections that are shaped similar to the letter Z are referenced as Z shapes. Section designations can be regional and even specific to a manufacturer. In steel building construction, secondary members such as purlins (roof) and girts (wall) are frequently cold-formed steel C, Z or U sections, (or mill rolled) C sections. Most steel purlin has to have some welding support to insure strength can hold .
- Joists -must exhibit the strength to support the anticipated load over a long period of time. In many countries, the fabrication and installation of all framing members including joists must meet building code standards. Considering the cross section of a typical joist, the overall depth of the joist is critical in establishing a safe and stable floor or ceiling system. The wider the spacing between the joists, the deeper the joist will need to be to limit stress and deflection under load. Lateral support called dwang, blocking, or strutting increases its stability, preventing the joist from buckling under load. There are approved formulas for calculating the depth required and reducing the depth as needed; however, a rule of thumb for calculating the depth of a wooden floor joist for a residential property is to take half the span in feet, add two, and use the resulting number as the depth in inches; for example, the joist depth required for a 14‑foot span is 9 inches. Many steel joist manufacturers supply load tables in order to allow designers to select the proper joist sizes for their projects.
4. Truss- is an assembly of beams or other elements that creates a rigid structure. In engineering, a truss is a structure that “consists of two-force members only, where the members are organized so that the assemblage as a whole behaves as a single object”. A “two-force member” is a structural component where force is applied to only two points. Although this rigorous definition allows the members to have any shape connected in any stable configuration, trusses typically comprise five or more triangular units constructed with straight members whose ends are connected at joints referred to as nodes.
In this typical context, external forces and reactions to those forces are considered to act only at the nodes and result in forces in the members that are either tensile or compressive. For straight members, moments (torques) are explicitly excluded because, and only because, all the joints in a truss are treated as revolutes, as is necessary for the links to be two-force members.
5. bridge- whose load-bearing superstructure is composed of a truss, a structure of connected elements usually forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or sometimes both in response to dynamic loads. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by 19th and early 20th-century engineers. A truss bridge is economical to construct because it uses materials efficiently.