Wednesday, October 21, 2020

Rate analysis for Back Filling work

Rate analysis for Back filling Work

Now a day we are releasing all rate analysis series as per our best readers demands, in last blog we got detailed rate analysis about excavation work. Now in this blog we are going to get detailed analysis about back filling work.



There are two types of rate analysis, but you are going to study some government rates, we can found many types of back filling work which are depend on various types are as follows

1. Back filling Material

There are many types of back filling materials which are using at various types of sites. In some important projects like Bridges foundations, metro projects foundations are using crush sand for back filling, on railway track there are using 60-90 mm course aggregates, somewhere 10-20 mm course aggregates are using for back filling, for earthen dams there is using soil for back filling, and some projects of roads, embankments of bridges, building foundations, etc. are using murum. In all world there are commonly using murum for back filling.

2. onsite material

Commonly back filling work is done after excavation work, so therefore lot of excavated material is stock at site, and lot of times to avoid extra cost to buy outside material there are using excavated material to back filling, this method is very commonly using in all over world but sometimes the location of site, type of excavated material, etc. need to buy outside materials.

3. outside material

In some projects which are located are near creek, near ocean, near sea, near dam, near river, water land, there are water table is up to 5ft from ground level and lot of black cotton soil is there so in these cases after excavation there need to buy outside back filling materials.     

4. Distance

When we are going to buy outside material to back filling work there is distance factor is very affected on the rate of the material.

5. Manual

Sometimes need back filling work manually due to site condition or site location. Like hilly area, under the building, small building in crowded public place, no roads for machine travel. Etc.

6. Machine

Now a days we are using all work is done by machine, back filling work is on of from those, now a days lot of types of mini machines are available which are going every were on site like under the building. On road work there is lot of work is done machines.

Now today we are just giving formal information about back filling work. Now we will analyse the common using rate analysis of back filling work which can give idea to how to work out the rate analysis.




There are main 2 types of rate analysis which are using commonly in society.
1. Back filling with site material.
2. Back filling with excavated site material.


We are giving just these 2 types of analysis which are very useful to analyse to get basic knowledge of analysis. After that you can also work on it as per your material types and distance, etc. as we have given some differentiation factor above.

1. Back filling with site material.



In given table you can get easily idea about how we can prepare the analysis of back filling work,
Know the constants required to desired unit to work. He are we are giving you rate analysis details in Cum only, which are using comely in construction industry but material procurement unit might be different than out rate analysis unit. You need to focus on that. If out rate analysis unit is in Cum, but material procurement unit is Brass, so you need to prepare the rate analysis according to that and conversion of material constant will be according to it.
 

Sr. No.

Material/Labour Name

Unit

Constant

Wastage %

Constant with Wastage

Rate

Amount

 

BACK FILLING WITH SITE MATERIAL

 

MATERIAL

1.

Construction Water

Litre

25

5%

26.50

0.08

2.10

 

LABOUR

1.

Back filling by Machine (Mini Poclain)

Cum

0.95

0%

0.95

60.00

57.00

2.

Back filling by Manual

Brass

0.018

0%

0.018

350

6.30

3.

Compaction by vibro roller

Cum

0.015

0%

0.015

2000

30.00

 

TOTAL AMOUNT

95.40

 

OVERHEADS

 

 

 

 

 

 

 

Plant & Machinery

 

 

 

 

1.5%

1.43

 

Water & Electricity Charges

 

 

 

 

1.5%

1.43

 

TOTAL AMOUNT WITH OVERHEADS

98.20

 

CONTRACTORS PROFIT

 

 

 

 

15%

14.73

 

TOTAL AMOUNT WITH PROFIT

112.93

 

SAY

115.00

 
 

2. Back filling with outside material 



As we discussed above as why need outside material, but outside material rate is depend on distance from site. As well as type of material as discussed.

As per basic information from local source and local contractors practice of rate for distance is considered with mutual understanding and previous business relations with contractors.
But in general there are using a practice as follows
0-10 km: Rs. 0.00/Cum
10-20 Km: Rs. 20.00/Cum
20-30 Km: Rs. 40.00/Cum
30-50 Km: Rs. 60.00/Cum
But lot of times this is depend on quantity of work, if there is huge quantity of work, and then there is no one considering this distance factor.
 

Sr. No.    

Material/Labour Name

Unit

Constant

Wastage %

Constant with Wastage

Rate

Amount

 

BACK FILLING WITH SITE MATERIAL

 

MATERIAL

1.

Murum

Brass

0.353

10%

0.3887

900

349.83

2.

Construction Water

Litre

25

5%

26.25

0.08

2.10

 

LABOUR

1.

Back filling by Machine (Mini Poclain)

Cum

0.95

0%

0.95

60.00

57.00

2.

Back filling by Manual

Brass

0.018

0%

0.018

350

6.30

3.

Compaction by vibro roller

Cum

0.015

0%

0.015

2000

30.00

 

TOTAL AMOUNT

445.23

 

OVERHEADS

 

 

 

 

 

 

 

Plant & Machinery

 

 

 

 

1.5%

6.678

 

Water & Electricity Charges

 

 

 

 

1.5%

6.678

 

TOTAL AMOUNT WITH OVERHEADS

458.58

 

CONTRACTORS PROFIT

 

 

 

 

15%

68.78

 

TOTAL AMOUNT WITH PROFIT

527.37

 

SAY

530.00

 
 
Back filling rate analysis are generally as per given formats  but rates are decided are as per quantity of work, if there is huge quantity of work there will be rate are decided as per the quantum of work.

Sometimes distance doesn’t matter if regular contractor is working, as well as sometimes if murum or other quarry material is need to excavate and dump outside that time lot of contractors are directly meet to this land owner and directly deal with him with minimum rates, because both peoples need will fulfil with this procedure. Like if Land Owner wants to do Excavation of a building or plot and other contractor want to back filling material to his site. I these type o cases contractor can get god benefits as he can do excavation of this plot as back filling to another plot but in this work he want heavy machinery like excavator, hywa, dumper, JCB, compactor, roller, dosser, grader, breaker, etc.
 
In back filling work Compaction factor also affecting on rates if any clients given to show the proctor test up to 95% then back filling work need to do very carefully. The back filling work wants to do in layers in 300 mm to 600 mm thickness. As well as back filling need to do under observation to avoid the using of boulders or any other hard materials if using murum. As well as while compaction of murum need to spray the water on compacted surface and then again need to do compaction to achieve the 95% proctor test.




If anyone want to do rate analysis follow these processes and take care while checking the rate of material and labour because it will directly affecting your budget and may be face the losses.

If any issues we are providing the assistance. Contact us with your details and problems we will try to solve your problems.
 
 
Team

CBEC India.

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