ABOUT CONSTRUCTION

In large construction projects such as skyscrapers, cranes are essential.

In the fields of architecture and civil engineering, construction is a process that consists of the building or assembling of infrastructure. Far from being a single activity, large scale construction is a feat of multitasking. Normally the job is managed by the project manager and supervised by the construction manager, design engineer, construction engineer or project architect.

For the successful execution of a project, effective planning is essential. Those involved with the design and execution of the infrastructure in question must consider the environmental impact of the job, the successful scheduling, budgeting, site safety, availability of materials, logistics, inconvenience to the public caused by construction delays, preparing tender documents, etc.

Types of construction projects

In general, there are three types of construction:

1. Building construction
2. Heavy/civil construction
3. Industrial construction

Each type of construction project requires a unique team to plan, design, construct, and maintain the project.

Building construction

Building construction for several apartment blocks. The blue material is insulation cladding, which will be covered later.

A large unfinished building.

Scenic view of the construction of the Havelock City Project in Sri Lanka.

Scenic view of the construction of Phase-1 of the Havelock City Project in Sri Lanka.

Building construction is the process of adding structure to real property. The vast majority of building construction projects are small renovations, such as addition of a room, or renovation of a bathroom. Often, the owner of the property acts as laborer, paymaster, and design team for the entire project. However, all building construction projects include some elements in common - design, financial, and legal considerations. Many projects of varying sizes reach undesirable end results, such as structural collapse, cost overruns, and/or litigation reason, those with experience in the field make detailed plans and maintain careful oversight during the project to ensure a positive outcome.

Building construction is procured privately or publicly utilizing various delivery methodologies, including hard bid, negotiated price, traditional, management contracting, construction management-at-risk, design & build and design-build bridging.

Residential construction practices, technologies, and resources must conform to local building authority regulations and codes of practice. Materials readily available in the area generally dictate the construction materials used (e.g. brick versus stone, versus timber). Cost of construction on a per square metre (or per square foot) basis for houses can vary dramatically based on site conditions, local regulations, economies of scale (custom designed homes are always more expensive to build) and the availability of skilled tradespeople. As residential (as well as all other types of construction) can generate a lot of waste, careful planning again is needed here.

The most popular method of residential construction in the United States is wood framed construction. As efficiency codes have come into effect in recent years, new construction technologies and methods have emerged. University Construction Management departments are on the cutting edge of the newest methods of construction intended to improve efficiency, performance and reduce construction waste.

Building construction is the process of adding structure to real property. The vast majority of building construction projects is small renovations, such as addition of a room, or renovation of a bathroom. Often, the owner of the property acts as laborer, paymaster, and design team for the entire project. However, all building construction projects include some elements in common - design, financial, and legal considerations. Many projects of varying sizes reach undesirable end results, such as structural collapse, cost overruns, and/or litigation reason; those with experience in the field make detailed plans and maintain careful oversight during the project to ensure a positive outcome.

Building construction is produced privately or publicly utilizing various delivery methodologies including hard-bid, negotiated price, traditional management-at-risk design build and design build bridging.

Industrial construction

Industrial construction, though a relatively small part of the entire construction industry, is a very important component. Owners of these projects are usually large, for-profit, industrial corporations. These corporations can be found in such industries as medicine, petroleum, chemical, power generation, manufacturing, etc. Processes in these industries require highly specialized expertise in planning, design, and construction. As in building and heavy/highway construction, this type of construction requires a team of individuals to ensure a successful project.

Construction processes

Design team

Shasta Dam under construction

In the modern industrialized world, construction usually involves the translation of paper or computer based designs into reality. A formal design team may be assembled to plan the physical proceedings, and to integrate those proceedings with the other parts. The design usually consists of drawings and specifications, usually prepared by a design team including the client architects, interior designers, surveyors, civil engineers, cost engineers (or quantity surveyors), mechanical engineers, electrical engineers, structural engineers, and fire protection engineers. The design team is most commonly employed by (i.e. in contract with) the property owner. Under this system, once the design is completed by the design team, a number of construction companies or construction management companies may then be asked to make a bid for the work, either based directly on the design, or on the basis of drawings and a bill of quantities provided by a quantity surveyor. Following evaluation of bids, the owner will typically award a contract to the lowest responsible bidder.

The modern trend in design is toward integration of previously separated specialties, especially among large firms. In the past, architects, interior designers, engineers, developers, construction managers, and general contractors were more likely to be entirely separate companies, even in the larger firms. Presently, a firm that is nominally an "architecture" or "construction management" firm may have experts from all related fields as employees, or to have an associated company that provides each necessary skill. Thus, each such firm may offer itself as "one-stop shopping" for a construction project, from beginning to end. This is designated as a "design Build" contract where the contractor is given a performance specification, and must undertake the project from design to construction, while adhering to the performance specifications.

Construction of a pre-fabricated house

Several project structures can assist the owner in this integration, including design-build, partnering, and construction management. In general, each of these project structures allows the owner to integrate the services of architects, interior designers, engineers, and constructors throughout design and construction. In response, many companies are growing beyond traditional offerings of design or construction services alone, and are placing more emphasis on establishing relationships with other necessary participants through the design-build process.

The increasing complexity of construction projects creates the need for design professionals trained in all phases of the project's life-cycle and develop an appreciation of the building as an advanced technological system requiring close integration of many sub-systems and their individual components, including sustainability. Building engineering is an emerging discipline that attempts to meet this new challenge.

Financial advisors

Many construction projects suffer from preventable financial problems. Underbids ask for too little money to complete the project. Cash flow problems exist when the present amount of funding cannot cover the current costs for labour and materials, and because they are a matter of having sufficient funds at a specific time, can arise even when the overall total is enough. Fraud is a problem in many fields, but is notoriously prevalent in the construction field. Financial planning for the project is intended to ensure that a solid plan, with adequate safeguards and contingency plans, is in place before the project is started, and is required to ensure that the plan is properly executed over the life of the project.

Mortgage bankers, accountants, and cost engineers are likely participants in creating an overall plan for the financial management of the building construction project. The presence of the mortgage banker is highly likely even in relatively small projects, since the owner's equity in the property is the most obvious source of funding for a building project. Accountants act to study the expected monetary flow over the life of the project, and to monitor the payouts throughout the process. Cost engineers apply expertise to relate the work and materials involved to a proper valuation. Cost overruns with government projects have occurred when the contractor was able to identify change orders or changes in the project resulting in large increases in cost, which are not subject to competition by other firm as they have already been eliminated from consideration after the initial bid.

Large projects can involve highly complex financial plans. As portions of a project are completed, they may be sold, supplanting one lender or owner for another, while the logistical requirements of having the right trades and materials available for each stage of the building construction project carries forward. In many English speaking countries, but not the United States, projects typically use quantity surveyors.

Legal considerations

A construction project must fit into the legal framework governing the property. These include governmental regulations on the use of property, and obligations that are created in the process of construction.

The project must adhere to zoning and building code requirements. Constructing a project that fails to adhere to codes will not benefit the owner. Some legal requirements come from malum in se considerations, or the desire to prevent things that are indisputably bad - bridge collapses or explosions. Other legal requirements come from malum prohibitum considerations, or things that are a matter of custom or expectation, such as isolating businesses to a business district and residences to a residential district. An attorney may seek changes or exemptions in the law governing the land where the building will be built, either by arguing that a rule is inapplicable (the bridge design won't collapse), or that the custom is no longer needed (acceptance of live-work spaces has grown in the community).

A construction project is a complex net of contracts and other legal obligations, each of which must be carefully considered. A contract is the exchange of a set of obligations between two or more parties, but it is not so simple a matter as trying to get the other side to agree to as much as possible in exchange for as little as possible. The time element in construction means that a delay costs money, and in cases of bottlenecks, the delay can be extremely expensive. Thus, the contracts must be designed to ensure that each side is capable of performing the obligations set out. Contracts that set out clear expectations and clear paths to accomplishing those expectations are far more likely to result in the project flowing smoothly, whereas poorly drafted contracts lead to confusion and collapse.

Legal advisors in the beginning of a construction project seek to identify ambiguities and other potential sources of trouble in the contract structure, and to present options for preventing problems. Throughout the process of the project, they work to avoid and resolve conflicts that arise. In each case, the lawyer facilitates an exchange of obligations that matches the reality of the project.

Interaction of expertise

Design, finance, and legal aspects overlap and interrelate. The design must be not only structurally sound and appropriate for the use and location, but must also be financially possible to build, and legal to use. The financial structure must accommodate the need for building the design provided, and must pay amounts that are legally owed. The legal structure must integrate the design into the surrounding legal framework, and enforces the financial consequences of the construction process.

Procurement

Procurement describes the merging of activities undertaken by the client to obtain a building. There are many different methods of construction procurement; however the three most common types of procurement are:

1. Traditional (Design-bid-build)
2. Design and Build
3. Management Contracting

Traditional

This the most common method of construction procurement and is well established and recognized. In this arrangement, the architect or engineer acts as the project coordinator. His or her role is to design the works, prepare the specifications and produce construction drawings, administer the contract, tender the works, and manage the works from inception to completion. There are direct contractual links between the architect's client and the main contractor. Any subcontractor will have a direct contractual relationship with the main contractor.

Design and build

This approach has become more common in recent years and includes an entire completed package, including fixtures, fittings and equipment where necessary, to produce a completed fully functional building. In some cases, the Design and Build (D & B) package can also include finding the site, arranging funding and applying for all necessary statutory consents.

The owner produces a list of requirements for a project, giving an overall view of the project's goals. Several D&B contractors present different ideas about how to accomplish these goals. The owner selects the ideas he likes best and hires the appropriate contractor. Often, it is not just one contractor, but a consortium of several contractors working together. Once a contractor (or a consortium/consortia) has been hired, they begin building the first phase of the project. As they build phase 1, they design phase 2. This is in contrast to a design-bid-build contract, where the project is completely designed by the owner, then bid on, then completed.

Kent Hansen, director of engineering for the National Asphalt Pavement Association (NAPA), pointed out that state departments of transportation (DOTs) usually use design build contracts as a way of getting projects done when states don't have the resources. In DOTs, design build contracts are usually used for very large projects.

Management procurement systems

In this arrangement the client plays an active role in the procurement system by entering into separate contracts with the designer (architect or engineer), the construction manager, and individual trade contractors. The client takes on the contractual role, while the construction or project manager provides the active role of managing the separate trade contracts, and ensuring that they all work smoothly and effectively together.

Management procurement systems are often used to speed up the procurement processes, allow the client greater flexibility in design variation throughout the contract, the ability to appoint individual work contractors, separate contractual responsibility on each individual throughout the contract, and to provide greater client control.

Authority having jurisdiction

In construction, the authority having jurisdiction (AHJ) is the governmental agency or sub-agency which regulates the construction process. In most cases, this is the municipality in which the building is located. However, construction performed for supra-municipal authorities are usually regulated directly by the owning authority, which becomes the AHJ.

During the planning of a building, the zoning and planning boards of the AHJ will review the overall compliance of the proposed building with the municipal General Plan and zoning regulations. Once the proposed building has been approved, detailed civil, architectural, and structural plans must be submitted to the municipal building department (and sometimes the public works department) to determine compliance with the building code and sometimes for fit with existing infrastructure. Often, the municipal fire department will review the plans for compliance with fire-safety ordinances and regulations.

Construction on a building in Kansas City

Before the foundation can be dug, contractors are typically required to notify utility companies, either directly or through a company such as Dig Safe to ensure that underground utility lines can be marked. This lessens the likelihood of damage to the existing electrical, water, sewage, phone, and cable facilities, which could cause outages and potentially hazardous situations. During the construction of a building, the municipal building inspector inspects the building periodically to ensure that the construction adheres to the approved plans and the local building code. Once construction is complete and a final inspection has been passed, an occupancy permit may be issued.

An operating building must remain in compliance with the fire code. The fire code is enforced by the local fire department.

Changes made to a building that affect safety, including its use, expansion, structural integrity, and fire protection items, usually require approval of the AHJ for review concerning the building code.

Construction careers

Ironworkers erecting the steel frame of a new building, at the Massachusetts General Hospital, USA.

There are many routes to the different careers within the construction industry which vary by country. However, there are three main tiers of careers based on educational background which are common internationally:

• Unskilled and Semi-Skilled - General site labour with little or no construction qualifications.
• Skilled - On-site managers whom possess extensive knowledge and experience in their craft or profession.
• Technical and Management - Personnel with the greatest educational qualifications, usually graduate degrees, trained to design, manage and instruct the construction process.

Skilled occupations in the UK require Further Education qualifications, often in vocational subject areas. These qualifications are either obtained directly after the completion of compulsory education or through "on the job" apprenticeship training. In the UK, 8500 construction-related apprenticeships were commenced in 2007.

Technical and specialised occupations require more training as a greater technical knowledge is required. These professions also hold more legal responsibility. A short list of the main careers with an outline of the educational requirements are given below:

• Architect - Typically holds at least a 4-year degree in architecture. To use the title "architect" the individual must hold chartered status with the Royal Institute of British Architects and be on the Architects Registration Board.
• Civil Engineer - Typically holds a degree in a related subject. The Chartered Engineer qualification is controlled by the Institution of Civil Engineers. A new university graduate must hold a masters degree to become chartered, persons with bachelors degrees may become an Incorporated Engineer.
• Building Services Engineer - Often referred to as an "M&E Engineer" typically holds a degree in mechanical or electrical engineering. Chartered Engineer status is governed by the Chartered Institution of Building Services Engineers.
• Project Manager - Typically holds a 2-year or greater higher education qualification, but are often also qualified in another field such as quantity surveying or civil engineering.
• Quantity Surveyor - Typically holds a masters degree in quantity surveying. Chartered status is gained from the Royal Institute of Chartered Surveyors.
• Structural Engineer - Typically holds a bachelors or masters degree in structural engineering, new university graduates must hold a masters degree to gain chartered status from the Institution of Structural Engineers.

History

The first buildings were huts and shelters, constructed by hand or with simple tools. As cities grew during the bronze age, a class of professional craftsmen like bricklayers and carpenters appeared. Occasionally, slaves were used for construction work. In the middle ages, these were organized into guilds. In the 19th century, steam-powered machinery appeared, and later diesel- and electric powered vehicles such as cranes, excavators and bulldozers.

ALL ABOUT CALIFORNIA

The State of California is a state located in the western Pacific region of the United States and was the 31st admitted to the Union. It is the most populous state of the United States. It is bordered by Oregon to the north, Nevada to the east, and Arizona to the southeast in the United States, as well as Baja California in Mexico to the south. California's capital city is Sacramento, with the four largest cities being Los Angeles, San Diego, San Jose, and San Francisco. California is known for its diverse climate and geography, as well as ethnically diverse population. The state has 58 counties.

Before becoming a part of the United States, Alta California was colonized by the Spanish Empire in 1769. After Mexican independence in 1821, Alta California remained as part of Mexico until 1846, when it was the independent California Republic for one brief week. Following the conclusion of the Mexican-American war of 1848, California was annexed by the United States and was admitted to the Union as the thirty-first state on September 9, 1850.

California is the third largest state by area in the US; its size gives it a diverse geography, which ranges from sandy and rocky beaches of the Pacific coast, to the rugged snowcapped Sierra Nevada mountains in the east, to desert areas in the southeast and the forests of the northwest. The center portion of the state is dominated by the Central Valley, one of the most productive agricultural areas in the world and the largest of any US state. The Sierra Nevada mountains contain Yosemite Valley, famous for its glacially-carved domes, and Sequoia National Park, home to the giant sequoia trees, the largest living organisms on Earth. The state is home to Mount Whitney, the highest point in the contiguous United States,[2] as well as the second lowest and hottest place in the Western Hemisphere, Death Valley. Many of the trees located in the California White Mountains are the oldest in the world; one Bristlecone pine has an age of 4,700 years.

The California Gold Rush began in 1848, dramatically changing California to accommodate an influx of population and an economic boom. The early 20th century was marked by Los Angeles becoming the center of the entertainment industry, in addition to the growth of a large tourism sector in the state. Along with California's prosperous agricultural industry, other industries include aerospace, petroleum, and computer and information technology. California ranks among the top ten largest economies in the world, and were it a separate country, it would be 34th amongst the most populous countries, just behind Poland, as well as the 6th World's largest economy.

California borders the Pacific Ocean, Oregon, Nevada, Arizona, and the Mexican state of Baja California. With an area of 160,000 mi² (411,000 km²) it is the third largest state in the United States in size, after Alaska and Texas.

California's geography is rich, complex, and varied. In the middle of the state lies the California Central Valley, bounded by the coastal mountain ranges in the west, the Sierra Nevada to the east, the Cascade Range in the north and the Tehachapi Mountains in the south. The Central Valley is California's agricultural heartland and grows approximately one-third of the nation's food.[5] Divided in two by the Sacramento-San Joaquin River Delta, the northern portion, the Sacramento Valley serves as the watershed of the Sacramento River, while the southern portion, the San Joaquin Valley is the watershed for the San Joaquin River; both areas derive its name from the rivers that transit them. With dredging, the Sacramento and the San Joaquin Rivers have remained sufficiently deep that several inland cities are seaports. The Sacramento-San Joaquin Bay Delta serves as a critical water supply hub for the state. Water is routed through an extensive network of canals and pumps out of the delta, that traverse nearly the length of the state, including the Central Valley Project, and the State Water Project. Water from the Sacramento-San Joaquin Bay Delta provides drinking water for nearly 23 million people, almost two-thirds of the state's population, and provides water to farmers on the west side of the San Joaquin Valley. The Channel Islands are located off the southern coast.

The Sierra Nevada (Spanish for "snowy range") include the highest peak in the contiguous forty-eight states, Mount Whitney, at 14,505 ft (4,421 m), Yosemite National Park, and the deep freshwater lake, Lake Tahoe, the largest lake in the state by volume. To the east of the Sierra Nevada are Owens Valley and Mono Lake, an essential migratory bird habitat. In the western part of the state is Clear Lake, the largest freshwater lake by area entirely in California. Though Lake Tahoe is larger, it is divided by the California/Nevada border. The Sierra Nevada falls to Arctic temperatures in winter and has several dozen small glaciers, including Palisade Glacier, the southernmost glacier in the United States.

About 35% of the state's total surface area is covered by forests, and California's diversity of pine species is unmatched by any other state. California contains more forest land than any other state except Alaska. In the south is a large inland salt lake, the Salton Sea. Deserts in California make up about 25% of the total surface area. The south-central desert is called the Mojave; to the northeast of the Mojave lies Death Valley, which contains the lowest, hottest point in North America, Badwater Flat. The distance from the lowest point of Death Valley to the peak of Mount Whitney is less than 200 miles (322 km). Indeed, almost all of southeastern California is arid, hot desert, with routine extreme high temperatures during the summer.

Along the California coast are several major metropolitan areas, including Greater Los Angeles, the San Francisco Bay Area, and San Diego.

By 2007, California's population has reached 37,700,000, making it the most populated state, and is the 13th fastest-growing state. This includes a natural increase since the last census of 1,909,368 people (that is 3,375,297 births minus 1,465,929 deaths) and an increase due to net migration of 774,198 people into the state. Immigration from outside the United States resulted in a net increase of 1,724,790 people, and migration within the country produced a net decrease of 950,592.[10] According to the Sacramento News & Review, California's population will increase to 50 million people by 2025.[11]

California is the second most populous state in the Western Hemisphere, exceeded only by São Paulo State, Brazil. More than 12 percent of US citizens live in California and its population is greater than that of all but 34 countries of the world. California has eight of the top 50 US cities in terms of population. Los Angeles is the nation's second-largest city with a population of 3,849,378 people, followed by San Diego (8th), San Jose (10th), San Francisco (14th), Long Beach (34th), Fresno (36th), Sacramento (37th) and Oakland (44th). Los Angeles County has held the title of most populous county for decades, and is more populous than 42 US states. The center of population of California is at the town of Buttonwillow in Kern County.

As of 2005, The gross state product (GSP) is about $1.62 trillion, the largest in the United States. California is responsible for 13% of the United States gross domestic product (GDP). As of 2005, California's GDP is larger than all but seven countries in the world (and all but eight countries by Purchasing Power Parity).

California is also the home of several significant economic regions, such as Hollywood (entertainment), the California Central Valley (agriculture), the Silicon Valley and Tech Coast (computers and high tech), and wine producing regions, such as the Napa Valley, Sonoma Valley and Southern California's Santa Barbara and Paso Robles areas.

The predominant industry, more than twice as large as the next, is agriculture, (including fruit, vegetables, dairy, and wine). This is followed by aerospace; entertainment, primarily television by dollar volume, although many movies are still made in California; music production and recording studios; light manufacturing, including computer hardware and software; and the mining of borax. Oil drilling has played a significant role in the development of the state.

Per capita personal income was $38,956 as of 2006, ranking 11th in the nation. Per capita income varies widely by geographic region and profession. The Central Valley is the most impoverished, with migrant farm workers making less than minimum wage. Recently, the San Joaquin Valley was characterized as one of the most economically depressed regions in the US, on par with the region of Appalachia.

Many coastal cities include some of the wealthiest per-capita areas in the US The high-technology sectors in Northern California, specifically Silicon Valley, in Santa Clara and San Mateo counties, are currently emerging from economic downturn caused by the dot.com bust, which caused the loss of over 250,000 jobs in Northern California alone. As of spring 2005, economic growth has resumed in California at 4.3%.

California levies a 9.3% maximum variable rate income tax, with 6 tax brackets. It collects about $40 billion per year in income taxes. California's combined state, county and local sales tax rate is from 7.25 to 8.75%. The rate varies throughout the state at the local level. In all, it collects about $28 billion in sales taxes per year. All real property is taxable annually, the tax based on the property's fair market value at the time of purchase. This tax does not increase based on a rise in real property values (see Proposition 13). California collects $33 billion in property taxes per year.

The state of California has 478 incorporated cities and towns, of which 456 are cities and 22 are towns. Under California law, the terms "city" and "town" are explicitly interchangeable; the name of an incorporated municipality in the state can either by "City of (Name)" or "Town of (Name)." Please find the list below:

The majority of these cities and towns are within one of five metropolitan areas. Sixty-eight percent of California's population lives in its three largest metropolitan areas, Greater Los Angeles, the San Francisco Bay Area and the Riverside-San Bernardino Area also know as the Inland Empire. Although smaller, the other two large population centers are the San Diego and the Sacramento metro areas. California is home to the largest county in the contiguous United States by area, San Bernardino County.

ABOUT NEVADA
http://en.wikipedia.org/wiki/Nevada

ABOUT ARIZONA
http://en.wikipedia.org/wiki/Arizona