Off-site construction involves the process of planning , designing, fabricating, transporting and assembling building elements for rapid site assembly to a greater degree of finish than in traditional piecemeal on-site construction. Off-site building includes a range of materials, scales and systems, digital software , methods of manufacture and fabrication, and innovations in social and technological integration. Off-site outputs include componentized, panelized, and modularized elements deployed in the service of structural, enclosure, service and interior partition systems. An optimizing strategy of off-site is to integrate these systems and supply chain through research, design, testing, and prototyping. The modular industry consists of two distinct industry segments: re-locatable modular and permanent modular.
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Prefabrication is the practice of assembling components of a structure in a factory or other manufacturing site, and transporting complete assemblies or sub-assemblies to the construction site where the structure is to be located.
The term is used to distinguish this process from the more conventional construction practice of transporting the basic materials to the construction site where all assembly is carried out. The term prefabrication also applies to the manufacturing of things other than structures at a fixed site. It is frequently used when fabrication of a section of a machine or any movable structure is shifted from the main manufacturing site to another location, and the section is supplied assembled and ready to fit.
It is not generally used to refer to electrical or electronic components of a machine, or mechanical parts such as pumps, gearboxes and compressors which are usually supplied as separate items, but to sections of the body of the machine which in the past were fabricated with the whole machine. Prefabricated parts of the body of the machine may be called 'sub-assemblies' to distinguish them from the other components.
An example from house-building illustrates the process of prefabrication. The conventional method of building a house is to transport bricks , timber , cement , sand , steel and construction aggregate , etc. In prefabricated construction , only the foundations are constructed in this way, while sections of walls , floors and roof are prefabricated assembled in a factory possibly with window and door frames included , transported to the site, lifted into place by a crane and bolted together.
Prefabrication is used in the manufacture of ships , aircraft and all kinds of vehicles and machines where sections previously assembled at the final point of manufacture are assembled elsewhere instead, before being delivered for final assembly. The theory behind the method is that time and cost is saved if similar construction tasks can be grouped, and assembly line techniques can be employed in prefabrication at a location where skilled labour is available, while congestion at the assembly site, which wastes time, can be reduced.
The method finds application particularly where the structure is composed of repeating units or forms, or where multiple copies of the same basic structure are being constructed. Prefabrication avoids the need to transport so many skilled workers to the construction site, and other restricting conditions such as a lack of power, lack of water, exposure to harsh weather or a hazardous environment are avoided. Against these advantages must be weighed the cost of transporting prefabricated sections and lifting them into position as they will usually be larger, more fragile and more difficult to handle than the materials and components of which they are made.
Prefabrication has been used since ancient times. For example, it is claimed that the world's oldest known engineered roadway , the Sweet Track constructed in England around BC , employed prefabricated timber sections brought to the site rather than assembled on-site.
Sinhalese kings of ancient Sri Lanka have used prefabricated buildings technology to erect giant structures, which dates back as far as years, where some sections were prepared separately and then fitted together, specially in the Kingdom of Anuradhapura and Kingdom of Polonnaruwa.
After the great Lisbon earthquake of , the Portuguese capital, especially the Baixa district, was rebuilt by using prefabrication on an unprecedented scale. Jose I , a new Pombaline style of architecture and urban planning arose, which introduced early anti-seismic design features and innovative prefabricated construction methods, according to which large multistory buildings were entirely manufactured outside the city, transported in pieces and then assembled on site.
The process, which lasted into the nineteenth century, lodged the city's residents in safe new structures unheard-of before the quake. The first of the prefabricated stones was laid in March By 13 May , the centre of the town had been finished and was officially opened.
In 19th century Australia a large number of prefabricated houses were imported from the United Kingdom. The method was widely used in the construction of prefabricated housing in the 20th century, such as in the United Kingdom as temporary housing for thousands of urban families "bombed out" during World War II.
Assembling sections in factories saved time on-site and the lightness of the panels reduced the cost of foundations and assembly on site. Coloured concrete grey and with flat roofs, prefab houses were uninsulated and cold and life in a prefab acquired a certain stigma, but some London prefabs were occupied for much longer than the projected 10 years. The Crystal Palace , erected in London in , was a highly visible example of iron and glass prefabricated construction; it was followed on a smaller scale by Oxford Rewley Road railway station.
The most widely used form of prefabrication in building and civil engineering is the use of prefabricated concrete and prefabricated steel sections in structures where a particular part or form is repeated many times. It can be difficult to construct the formwork required to mould concrete components on site, and delivering wet concrete to the site before it starts to set requires precise time management. Pouring concrete sections in a factory brings the advantages of being able to re-use moulds and the concrete can be mixed on the spot without having to be transported to and pumped wet on a congested construction site.
Prefabricating steel sections reduces on-site cutting and welding costs as well as the associated hazards. Prefabrication techniques are used in the construction of apartment blocks, and housing developments with repeated housing units. The quality of prefabricated housing units had increased to the point that they may not be distinguishable from traditionally built units to those that live in them.
The technique is also used in office blocks, warehouses and factory buildings. Prefabricated steel and glass sections are widely used for the exterior of large buildings. Detached houses, cottages, log cabin, saunas, etc. Prefabrication of modular wall elements allows building of complex thermal insulation , window frame components, etc. Wood construction in particular benefits from the improved quality. However, tradition often favors building by hand in many countries, and the image of prefab as a "cheap" method only slows its adoption.
However, current practice already allows the modifying the floor plan according to the customer's requirements and selecting the surfacing material, e. Prefabrication saves engineering time on the construction site in civil engineering projects.
This can be vital to the success of projects such as bridges and avalanche galleries , where weather conditions may only allow brief periods of construction. Prefabricated bridge elements and systems offer bridge designers and contractors significant advantages in terms of construction time, safety, environmental impact, constructibility, and cost. Prefabrication can also help minimize the impact on traffic from bridge building. Additionally, small, commonly used structures such as concrete pylons are in most cases prefabricated.
Radio towers for mobile phone and other services often consist of multiple prefabricated sections. Modern lattice towers and guyed masts are also commonly assembled of prefabricated elements. Prefabrication has become widely used in the assembly of aircraft and spacecraft , with components such as wings and fuselage sections often being manufactured in different countries or states from the final assembly site. However, this is sometimes for political rather than commercial reasons, such as for Airbus.
Off-Site fabrication is a process that incorporates prefabrication and pre-assembly. The process involves the design and manufacture of units or modules, usually remote from the work site, and the installation at the site to form the permanent works at the site. In its fullest sense, off-site fabrication requires a project strategy that will change the orientation of the project process from construction to manufacture to installation.
Examples of off-site fabrication are wall panels for homes, wooden truss bridge spans, airport control stations. There are four main categories of Off-Site fabrication, which is often also referred to as Off-Site Construction. These can be described as component or sub-assembly systems, panelised systems, volumetric systems, and modular systems. Below these categories different branches, or technologies are being developed. There are a vast number of different systems on the market which fall into these categories and with recent advances in digital design such as Building Information Modelling BIM , the task of integrating these different systems into a construction project is becoming increasingly a "digital" management proposition.
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Prefabricated construction is the practice of assembling a variety of components of a structure at a manufacturing site and transporting those sub-assemblies to the location of the construction jobsite. Prefabricated construction is sometimes thought of as a low-end and mass produced mode of construction. In reality however, it is quite the opposite. Prefabricated construction is becoming more common, improving in quality and has become available in a variety of budgets. Despite the perception of prefabrication, there are numerous benefits to this type of construction.
Fabrication & Offsite Construction
In structural engineering , a pre-engineered building PEB is designed by a PEB supplier or PEB manufacturer, to be fabricated using best suited inventory of raw materials available from all sources and manufacturing methods that can efficiently satisfy a wide range of structural and aesthetic design requirements. Within some geographic industry sectors these buildings are also called pre-engineered metal buildings PEMB or, as is becoming increasingly common due to the reduced amount of pre-engineering involved in custom computer-aided designs, simply engineered metal buildings EMB. During the s, standardized engineering designs for buildings were first marketed as PEBs. In pre-engineered buildings, the I beams used are usually formed by welding together steel plates to form the I section. The I beams are then field-assembled e.
Structural Fabrication & Erection Work
For an engineer who is new to designing multi-storey buildings it is important that they follow a logical sequence through the various stages of the design process. Six steps that define this sequence are described below. Rules of thumb are included within each step to help the designer quickly and efficiently arrive at a solution that is sensible for a given set of constraints. Two St. Peter's Square, Manchester.
The largest single factory for manufacturing of pre-engineered steel buildings in the world Factory Location: Dammam 1 st Industrial City. Zamil Steel is one of the few pre-engineered buildings companies that offers its clients a complete building system to the worldwide clients. Expertise in the fabrication and installation of structural steel and plate works for wide range of industrial and commercial applications. You are looking for turnkey construction? We are your single, reliable source for full-service construction projects across the Middle-east and Indian subcontinent. Wide variety of process plants, including petrochem plants, refineries, steel, fertilizer plants, desalination plants, and power plants. Zamil Industrial Investment Company.
Prefabrication , the assembly of buildings or their components at a location other than the building site. The method controls construction costs by economizing on time, wages, and materials. Prefabricated units may include doors, stairs, window walls, wall panels, floor panels, roof trusses, room-sized components, and even entire buildings. The concept and practice of prefabrication in one form or another has been part of human experience for centuries; the modern sense of prefabrication, however, dates from about
Prefabrication is the practice of assembling components of a structure in a factory or other manufacturing site, and transporting complete assemblies or sub-assemblies to the construction site where the structure is to be located. The term is used to distinguish this process from the more conventional construction practice of transporting the basic materials to the construction site where all assembly is carried out. The term prefabrication also applies to the manufacturing of things other than structures at a fixed site. It is frequently used when fabrication of a section of a machine or any movable structure is shifted from the main manufacturing site to another location, and the section is supplied assembled and ready to fit. It is not generally used to refer to electrical or electronic components of a machine, or mechanical parts such as pumps, gearboxes and compressors which are usually supplied as separate items, but to sections of the body of the machine which in the past were fabricated with the whole machine. Prefabricated parts of the body of the machine may be called 'sub-assemblies' to distinguish them from the other components. An example from house-building illustrates the process of prefabrication. The conventional method of building a house is to transport bricks , timber , cement , sand , steel and construction aggregate , etc. In prefabricated construction , only the foundations are constructed in this way, while sections of walls , floors and roof are prefabricated assembled in a factory possibly with window and door frames included , transported to the site, lifted into place by a crane and bolted together. Prefabrication is used in the manufacture of ships , aircraft and all kinds of vehicles and machines where sections previously assembled at the final point of manufacture are assembled elsewhere instead, before being delivered for final assembly.
The company boasts of strong human resource capital comprising team of professionally qualified engineers and technicians. Our passion to drive innovation inspires our team members to deliver best-in-class solutions and exceptional service to all our customers. We commit to provide excellence and value in our structural steel solutions and provide high-quality steel products. Our dedicated approach delivers exceptional quality, predictable outcomes, continuous growth, opportunities, and mutually beneficial relationships. Manufacturing Unit is spread over a total area of , Sq.
Facilities & Equipments
We are using below welding process for our structural fabrication. Final Activity in Fabrication component was blast cleaning and painting, Blast cleaning is the accepted way of carrying out surface preparation in a well-runfabrication shop. Abrasive particles are projected on to the surface of the steel at highspeed by either compressed air or centrifugal impeller to remove rust and roughen thesurface before applying the coating. By using shot or slag grits, both of which have anangular profile, surface oxides are removed and a rougher surface is obtained to providean adequate key for metal spraying or special paint. Our customers can be assured that any structure fabricated by Project Spec will be completed on time and in accordance with the highest engineering and architectural standards. We are proud to be a part of the ventures we have worked on and feel honoured by the trust our customers exhibit by including us in their enterprises time after time.
7 Benefits of Prefabricated Construction
Miscellaneous Publication - National Bureau of Standards. United States. National Bureau of Standards. Classified list of specifications.
Concrete masonry systems CMS are familiar to most people because they have been used for such a long time. All types of low-rise buildings are made with these materials, from residential to educational to commercial and industrial. The tough exterior of exposed units provides a durable finish in demanding environments.
Even the best of construction sites tends to have very limited space, be crowded, dirty and sometimes chaotic. Modern project design, construction and management tools make it much easier to move substantial portions of the project work offsite. Various modules, sections of piping or overhead racks and even complete rooms can be built offsite and transported to the site for fit up.
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