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Design and build

Design-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 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.

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Saturday, May 23, 2009



Construction Tips
In case of any construction project, proper planning is very important to ensure that the timelines are met and the construction is strong and durable. With the rapid development taking place in the industry, there is often a multiplicity of factors to be considered and decision making can be complex. To avoid your dependency upon the site engineer or contractor, it is advisable to be aware of certain important aspects with regard to construction planning.

Building Configuration

An important feature is regularity and symmetry in the overall shape of the building. A building shaped like a box, such as rectangular both in plan and elevation is inherently stronger than one that is L-shaped or U-shaped such as a building with wings.

Separation of Blocks

Separation of a large building into several blocks may have to be done in order to obtain symmetry and regularity of each block. Separated sections can be treated just like expansion joints.

Adverse Elements

Even before the construction commences, it is essential to check for certain adverse factors whose existence would necessitate the abandonment of that particular site for construction.

1. Immediate neighbourhood of rivers carrying heavy floods

2. Reclaimed soils; land subject to subsidence or settlement

3. Smoke or obnoxious odour due to vicinity to industrial areas

Besides the above factors, you must also ensure that the construction site should not be a part of a land depression. The topographical conditions of a site not only determine its elevation and foundation, but also affect the laying of sewers and drains.

Geological Conditions The geological conditions of the site are also important factors to be considered due to their effect on the foundation and the subsequent life and strength of the construction. If there is a rocky base on the surface or below, the site is optimum as it provides an excellent base for laying the foundation and also prevents damage due to moisture.

Orientation

In northern India, longer walls are generally placed towards north & south and shorter walls towards east & west, so that minimum possible walls are exposed to the sun. The general wind direction of the site also determines the orientation of the building. Plinth It is a good practice to keep plinth level 60 to 75 centimetres above natural ground level.

Plinth

It is a good practice to keep plinth level 60 to 75 centimetres above natural ground level.

Damp Proof Course

Provide a Damp Proof Course (D.P.C.) at plinth level in cement concrete by adding water -proofing compound in the ratio 1 : 2 : 4.

R.C.C. Bands

Provide R.C.C. bands at sill, lintel and roof levels for load bearing constructions.

Brick Masonry
Soak the red bricks in clear water thoroughly before use.
It is desirable to provide expansion joints after every 30 meter length of wall.
Half brick masonry wall should be reinforced with suitable reinforcement at every third or fourth course of wall.

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