Monday, December 5, 2016
Footings are crucial part of foundation development. Footings are generally formed with concrete through rebar reinforcement that is poured into an excavated trench. The footings are developed to provide support to the foundation and avoid settling.
A footing is a foundation unit that is built in brick work, masonry or concrete supported with the base of a wall or a column with the aim of dispersing the load over a huge area. A footing or a shallow foundation is arranged immediately underneath the bottom most part of the Superstructure supported by it.
A combined footing stands for a long footing that supports two or more columns in (generally two) one row. A combined footing belongs to a rectangular or trapezoidal shaped footing.
Download the sample drawing of combined footing design.
Saturday, December 3, 2016
By watching this construction video tutorial, one can sharpen his/her knowledge for developing stairs. The video also provides detailed information on how to measure the individual riser height by separating it into the total height among the lower and upper floors as well as estimate individual part perfectly.
While developing stairs, focus should be given on proper layout and some theoretically delicate calculations. Stairs must adhere to stringent building codes to maintain proper safety and climbing comfort.
There are three prime components in a standard staircase like stringers, treads and risers. Stringers, generally cut from 2 x 12s, which belong to the sloped boards for providing support to the other components and bearing the weight of people walking on the stairs. They're usually arranged 16 in. on center. While defining the width of the staircase, wider width is preferred as people can wal on wide staircases securely and comfortably.
Treads build the top surface of every step, and risers are set up directly below the front lip of each tread. Some stairs don't contain risers but it should be avoided as risers safeguard the uncovered endgrain of the notched stringers from the weather.
Friday, December 2, 2016
Concrete – cement : sand : gravel is a proportions calculator that measures perfect ratios and volumes of cement, water, sand and gravel in litres for producing concrete mix of the needed strength (mark).
The users will be able to indicate the density of the concrete mix, components humidity, porosity of sand & gravel and the requirement for smoothing down the completed structure as well as maintaining the correctness of calculation.
In case you are unaware about them, just keep the default values. Alternatively, you can choose the question symbol to work out, how the measurements will be completed.
The application is specifically developed for the builders who prepare concrete in a mixer independently.
Touch the question symbol if something is uncertain.
Go through the following link to download this useful construction app
Thursday, December 1, 2016
This construction video provides step-by-step instructions on how to measure excavation and backfill concerning trenches.
Trench stands for an extended excavation that is separated from pits or basements. A footing is a good instance of the trench.
In order to find out the volume of excavation for a simple footing, the following formula is used :-
CL x W x D = Cu.Ft. of Excavation
If you want to change to cubic yards, divide the results by 27
It becomes very difficult while going to make calculation for a trench that includes working spaces and sloped sides. The following formula is used for this purpose.
CL x AD x AW = Cu.Ft. of Excavation
Monday, November 28, 2016
This construction tutorial will teach you the detailed method for computing quantity of Cement, Sand & Aggregate in concrete as well as cost of materials with Microsoft Excel.
The volume of executable PCC is taken as 6 cubic meter that should be performed with M15 grade of concrete whose ratio is 1:2:4. MS Excel program is very useful to instantly produce and manage your concrete cost estimates accurately. Get detailed takeoff and summarize the quantities automatically based on the scope or assembly item.
Benefits of excel based estimating:
• Most of the calculations are automated
• User-friendly to use
• Save huge time in calculation
• Easily customizable according to your requirements
Friday, November 25, 2016
This construction video provides detailed methods for estimating the quantity of cement, sand and aggregate in cement concrete to figure out the cost of all the materials. In this video, the volume of PCC to be prepared is taken as 10 cubic meter that is to be completed with M15 grade of concrete in the ratio of 1:2:4.
In a simple term, concrete is defined as a blend of paste and aggregates. The paste is formed with portland cement and water and covers the surface of the fine and coarse aggregates. With a chemical reaction known as hydration, the paste is solidified and becomes stronger to develop the rock-like mass called concrete.
Due to its longevity, firmness and comparatively marginal cost, concrete is mostly recognized for the buildings & infrastructures like houses, schools and hospitals as well as airports, bridges, highways and rail systems all through the globe.
Cement is actually a vital component of concrete. This fine powder is amalgamated with water, sand, and gravel or crushed stone (fine and coarse aggregate) and develops the rock-like mass known as concrete.
Thursday, November 24, 2016
While developing a big project, there should be a perfect technical engineering perception and cautious observation. Besides, other crucial examinations, Reinforced Cement Concrete should be verified for rebar toward the supplied construction drawings / shop drawings or technical specifications.
It should be remembered that the obstacle and cost associated with this activity may cause imperfection from the contractors end and it should be resolved / settled by a well-known consulting firm assigning on the inspection of execution.
One should have sound knowledge and well versed with the binding method of the steel rebar. Given below, some useful construction tips suggested by the top peers:-
a. Initially, one should have good knowledge on how to study a rebar drawing as well as communicate with it in the jobsite. In order to become a proficient rebar checker, you should have the capability to read drawing.
b. Carry a measuring tape with yourself so that you can verify the spacing and the splice length or development length.
c. Use a plastic glove, when checking the rebars as holding steel with bare hands may cause harm to the skin of of your body.
d. Should be familiar with the physical features of the construction component i.e. installing the drainage pipe or electrical conduit or replacing water stopper and any other pipes / embedded item.
e. Use vernier caliper to verify rebar diameter, rebar spacing, rebar development length, lap / splice length, alignment. Other important things range from no sag or buckling in the bars, perfectly fixed & tightened couplers, rust free bars, verifying clear cover, counting no of bars as per drawing specifications and must not be below or over 2 bars.
f. As a newbie in this field, try to keep in touch with contractor’s foreman or site engineer as they know well how to arrange these bars.
g. You should have good knowledge concerning the steel quality tests like tensile strength check or torsion failure strength or coupler tension strength check etc. Make sure that the steel are used after proper verification and poor quality steels are used.
h. Because of rough field conditions and difficultly in setting up / fixing of rebars, the proper design can’t be created. But you must be very careful about it as improper design may lead to collapse of a building.
i. One of the very crucial factors is to retain the exact orientation of bars like main rebars should be always arranged under the distribution or temperature rebars. It can be verified from the drawings submitted to you.