Father of Engineering
Friday, September 21, 2018
Thursday, September 13, 2018
Friday, August 17, 2018
How do we calculate volume of 50Kg cement bag?
How do we calculate volume of 50Kg cement bag?
The basic things you should know to calculate the volume of 1 bag of cement is,
1. Density of cement bag = 1440 Kg/m3
2. Mass of one cement beg = 50kg
3. 1 m3 = 35.3147 cubic feet
4. 1 m3 = 103 liters
Formula of density :-
Density = Mass / Volume
Then :-
Volume = Mass / Density
Volume = 50 Kg / 1440 Kg/m3
Volume = 0.0347 m3
You can also calculate this in CFT or Litres
No of bags required in 1m3 = 1440 / 50 = 28.8 no’s
Then :-
1 bags = 1 / 28.8 = 0.0347m3
35.3147 CFT = 28.8 no’s bags
1 bag = 35.3147 / 28.8 = 1.226 CFT
1 bag = 0.0347m3 = 0.0347 × 103 =34.7
34.7 ≈ 35 Litres
Monday, August 13, 2018
Methods of Estimation for Building Works - Long Wall Short Wall
Long wall and short wall method
The estimation of building quantities like earth work, foundation concrete, brickwork in plinth and superstructure etc. can be worked out long wall short wall method and centerline method.
Long wall and short wall method = This is simple method and there are less chances of mistakes. In this method long wall and short wall are worked out separately.
Long wall length out-to out = (centre to centre length + half breadth on one side + half breadth on the other side)
Long wall length out-to out = (centre to centre length +one breadth)
Q. Calculate the quantity of the following item (shown in fig)
(a) Earthwork in excavation in foundation (b) Concrete in foundation (c) Brick work in foundation and plinth (d) Brickwork in superstructure
Ans. Calculation of quantities = No of wall × Length × Breadth × Height or Depth
Where
Length for Long wall = length of long wall centre to centre + Breadth
Length for Short wall = length of short wall centre to centre - Breadth
The length of long wall centre to centre = 5m + (1/2 × .30m) + (1/2 × .30m) = 5.30m
Where (30cm = .30m)
The length of short wall centre to centre = 4m + (1/2 × .30) + (1/2 × .30) = 4.30m
Where (30cm = .30m)
1. Earthwork in excavation in foundation :
Long Wall = 2 × (5.3m + .90m) × .90m × .90m = 10.04m3
Short Wall = 2 × (4.30m - .90m) × .90m × .90m = 5.51m3
Total = Long wall + Short wall = 10.04m3 + 5.51m3 = 15.55m3
2. Concrete in foundation :
Long Wall = 2 × (5.3m + .90m) × .90m × .30m = 3.35m3
Short Wall = 2 × (4.30m - .90m) × .90m × .30m = 1.81m3
Total = 3.35m3 + 1.81m3 = 5.81m3
3. Brick work in foundation and plinth :
3.1. 1st Footing
Long Wall = 2 × (5.3m + .60m) × .60m × .30m = 2.13m3
Short Wall = 2 × (4.3m -.60m) × .60m × .30m = 1.33m3
3.2. 2nd Footing
Long Wall = 2 × (5.3m + .50m) × .50m × .30m = 1.74m3
Short Wall = 2 × (4.30m - .50m) × .50m × .30m = 1.14m3
3.3. Plinth
Long Wall = 2 × (5.3m + .40m) × .40m × .60m = 2.74m3
Short Wall = 2 × (4.30m - .40m) × .40m × .60m = 1.87m3
Total = (2.13m3 + 1.33m3) + (1.74m3 + 1.14m3) + (2.74m3 + 1.87m3) = 10.95m3
4. Brickwork in superstructure :
Long Wall = 2 × (5.3m + .30m) × .30m × .3.50m = 11.76m3
Short Wall = 2 × (4.30m - .30m) × .30m × 3.50m = 8.40m3
Total = 11.76m3 + 8.40m3 = 20.16m3
The estimation of building quantities like earth work, foundation concrete, brickwork in plinth and superstructure etc. can be worked out long wall short wall method and centerline method.
Long wall and short wall method = This is simple method and there are less chances of mistakes. In this method long wall and short wall are worked out separately.
Long wall length out-to out = (centre to centre length + half breadth on one side + half breadth on the other side)
Long wall length out-to out = (centre to centre length +one breadth)
Q. Calculate the quantity of the following item (shown in fig)
(a) Earthwork in excavation in foundation (b) Concrete in foundation (c) Brick work in foundation and plinth (d) Brickwork in superstructure
Ans. Calculation of quantities = No of wall × Length × Breadth × Height or Depth
Where
Length for Long wall = length of long wall centre to centre + Breadth
Length for Short wall = length of short wall centre to centre - Breadth
The length of long wall centre to centre = 5m + (1/2 × .30m) + (1/2 × .30m) = 5.30m
Where (30cm = .30m)
The length of short wall centre to centre = 4m + (1/2 × .30) + (1/2 × .30) = 4.30m
Where (30cm = .30m)
1. Earthwork in excavation in foundation :
Long Wall = 2 × (5.3m + .90m) × .90m × .90m = 10.04m3
Short Wall = 2 × (4.30m - .90m) × .90m × .90m = 5.51m3
Total = Long wall + Short wall = 10.04m3 + 5.51m3 = 15.55m3
2. Concrete in foundation :
Long Wall = 2 × (5.3m + .90m) × .90m × .30m = 3.35m3
Short Wall = 2 × (4.30m - .90m) × .90m × .30m = 1.81m3
Total = 3.35m3 + 1.81m3 = 5.81m3
3. Brick work in foundation and plinth :
3.1. 1st Footing
Long Wall = 2 × (5.3m + .60m) × .60m × .30m = 2.13m3
Short Wall = 2 × (4.3m -.60m) × .60m × .30m = 1.33m3
3.2. 2nd Footing
Long Wall = 2 × (5.3m + .50m) × .50m × .30m = 1.74m3
Short Wall = 2 × (4.30m - .50m) × .50m × .30m = 1.14m3
3.3. Plinth
Long Wall = 2 × (5.3m + .40m) × .40m × .60m = 2.74m3
Short Wall = 2 × (4.30m - .40m) × .40m × .60m = 1.87m3
Total = (2.13m3 + 1.33m3) + (1.74m3 + 1.14m3) + (2.74m3 + 1.87m3) = 10.95m3
4. Brickwork in superstructure :
Long Wall = 2 × (5.3m + .30m) × .30m × .3.50m = 11.76m3
Short Wall = 2 × (4.30m - .30m) × .30m × 3.50m = 8.40m3
Total = 11.76m3 + 8.40m3 = 20.16m3
Sunday, August 12, 2018
sewage treatment plant
INTRODUCTION
Sewage -general
considerations
It is the technique of
removing harmful impurities from wastewater and household waste waters, both
runoff (effluents) and domestic. This process involves physical, chemical, and
biological processes to remove all types of contaminants. Its objective is to
zero liquid discharge and provide useful fresh water in the environment. The
sewage water is often adversely contaminated with many toxic organic and inorganic
compounds.
sewage treatment plant (Project picture) |
With the growth of
population and the modern cities the conventional method of wastewater disposal
has been replaced by the planed water-carried sewage system. Even in the small
cities the greater safety of sewerage, its convenience, and freedom from
nuisance have caused it to be adopted wherever finances permit.
Definitions:
Sewage: It may be defined as unwanted or undesirable matter either
in solid, semi solid or liquid form. The dry wastes are garbage, ashes etc. In
other words, the waste which contains suspended, colloidal and dissolved
solids, is called sewage.
Sullage: The liquid waste form kitchens, bathrooms and
wash-basins are called as sullage. So it is a type of sewage in a very wet
condition
Storm water: It is the liquid flowing in sewage during the
rainy season or after a period of rainfall is known as storm water
Combined system: A combined system sanitary sewage and storm
water in combined form are carried in a single sewer. So only one set of sewers
is laid for carrying both i.e. storm Water as well as sanitary
Separate system: A separate sewage system two set of sewers are
laid. One for carrying sanitary sewage and the other for carrying storm water.
So the storm water is discharged directly into the natural stream or river
whereas the sanitary sewage is carried to the treatment plant for further
treatment.
Partially separate system: A partially separate
sewage system, the storm water within permissible limits disposed off along
with sanitary sewage through the sewer. The excess quantity of storm water is
collected and conveyed separately. So the remaining portion of storm water is
diverted into a separated set of sewers or stream.
Sewer: An underground pipe or conduit which is used to carrying
sewage is known as sewer
Sanitary sewer: The sewers which carry sanitary sewage and
excludes all other types of sewage like storm sewage, surface water and ground
water is called as sanitary sewers
Sewerage: the various pipe are used to carry sewage. The
network of sewers or pipe used for transporting the sewage is called sewerage.
Dry weather flow: The normal flow in a sewer during a dry
weather is known as Dry weather flow (D.W.F.)
Dilute sewage: The sewage which contain less than 150 ppm of
suspended solids and B.O.D. is called dilute sewage. It includes animal dung
and horse drooping but they are less foul in nature and so does not create bed
smell.
Fresh sewage: The sewage which contains dissolved oxygen
(D.O.) at the point of treatment is called fresh sewage.
Septic sewage: The sewage which is under the treatment
process is known as septic sewage
Per capita demand: Per capita demand may be defined as total
yearly consumption of water for water supply scheme divided by the population
of that area and the number of days in a year’s
Advantages/Disadvantages
Advantages
- Eliminates 97% percent of solid waste
- Helps in improving public health and environment
- Helps natural nitrification without the need of chemicals
- Oxidation and nitration achieved
- Biological phosphorous removal
- Solids and liquids separation
- Removes organics
- Cost effective
- Easily to maintained mechanical work
- Self-sustaining system
Disadvantages
- Cleaning is a hassle
- Most plants need at least three tanks
- Temperature changes affect the tank greatly
- This type of plant requires a big area to be build.
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