Retaining wall cost estimation can be done on the basis of the plan, cross-section details and local rates for various works involved.
Retaining wall specifications, cross-section details
The following are the specifications of the retaining wall.
- For RCC work M25 grade concrete is utilised.
- Height of the retaining wall is 30 m and the height is 6 m.
- Main bars 20 mm Dia @ 400 mm c/c,200 mm c/c is utilised in three curtailments and Distribution bars 12 mm Dia @ 250 mm c/c, Vertical bars 12 mm @300 mm C/C, distribution bars 10 mm @ 300 mm c/c is utilised in retaining wall.
- In grade slab, top mat: 16 mm dia main bars @100 c/c, 10 mm dia @200 c/c distribution bars are utilised.
- In grade slab, bottom mat: 16 mm dia main bars @150 mm c/c,10 mm dia distribution bars 250 mm c/c is utilised.
- Depth of grade slab is 500 mm and the length is 3 m.
- The top width of the retaining wall is 200 mm, the bottom width is 600 mm.
Read related topics:
- Brickwork rate analysis| 3 materials
- RCC column cost estimation in 6 steps
- Double room building estimation in 6 steps
RCC Retaining wall quantity estimation 3 steps
- RCC quantity estimation
- Reinforcement quantity estimation
- Cost estimation
1. RCC Quantity estimation
For RCC M25 grade concrete is utilised.
From the cross-section details,Grade slab length =30 m,width=3 m,depth=0.5 m
Wall length =30 m,height=6 m, width is average of top and bottom.
RCC quantity in grade slab = 30 m x 3 m x 0.5 m = 45 cum
RCC quantity of retaining wall is 30 m x (0.6+0.2)*0.5*6=72 cum.
So Total RCC quantity = 45 cum + 72 cum =117 cum.
2. Reinforcement quantity estimation
20 mm dia main bars
Estimation of 20 mm dia main bars @ 400 mm c/c up to the full height
From the cross-section details,20 mm dia @ 400 mm c/c spacing is utilised up to full height 6.5 m.
Number of bars = (Total length-clear cover/spacing) +1 =((30 m- 0.05-0.05)/0.4)+1=(29.9/0.4)+1=76No’s, where,Clear cover =50mm
Cutting length =6.5 m -top cover-bottom cover+2 hooks+0.75 =6.5-0.05-0.07+20×0.020+0.75=7.53 m, where 2 hooks length = 20 x d (dia of bars).
So total cutting length of 20 mm dia @ 400 mm c/c spacing bars =7.53 m x 76 no’s =572.28 m.
Estimation of 20 mm dia main bars @ 400c/c spacing up to 3.6 m height
From the cross-section details,20 mm dia @ 200 mm c/c spacing is utilised up to 3.6 m height.
Number of bars = (Total length-clear cover/spacing) +1 =((30 m- 0.05-0.05-2*0.2)/0.4)+1=(29.5/0.4)+1=75 No’s.
Cutting length =6.5 m -top cover-bottom cover+2 hooks+0.75 -2.4 m=6.5-0.05-0.07+20×0.020+0.75-2.4 m =5.13 m, where 2 hooks length = 20 x d (dia of bars).
So total cutting length of 20 mm dia @ 400 mm c/c spacing bars =5.13 m x 75 no’s =384.75 m.
Estimation of 20 mm dia main bars @ 200c/c spacing up to 1.8 m height
From the cross-section details,20 mm dia @ 200 mm c/c spacing is utilised up to 1.8 m height.
Number of bars = (Total length-clear cover/spacing) +1 =((30 m- 0.05-0.05-2*0.1)/0.2)+1=(29.7/0.2)+1=150 No’s.
Cutting length =6.5 m -top cover-bottom cover+2 hooks+0.75 -4.2 m=6.5-0.05-0.07+20×0.020+0.75-4.2 m =3.33 m, where 2 hooks length = 20 x d (dia of bars).
So total cutting length of 20 mm dia @ 200 mm c/c spacing bars =3.33 m x 150 no’s =499.50 m.
So Total cutting length of 20mm dia =572.28 m +384.75 m +499.5 m=1456.53 m
Unit weight of steel =d x d/162 =20 x 20/162 =2.46 kg/m,where d=dia of steel.
So total weight of 20mm dia steel =1456.53 x 2.46 =3583.06 kg.
12 mm dia Bars
12mm dia distribution bars at 250 mm c/c
From the cross-section details,distribution bars12 mm dia @ 200 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((6.5 m- 0.05-0.07)/0.25)+1=(6.38/0.25)+1=27 No’s.
Cutting length =30 m -2 covers+2 overlaps +6 hooks=30 m-0.05-0.05+2 x 40×0.012+6x10x0.012=31.58 m, where hooks length = 10 x d (dia of bars),overlap lenght=40xd (dia of bars)
So total cutting length of 12 mm dia @ 250 mm c/c spacing bars =31.58 m x 27 no’s =852.66 m.
12mm dia vertical bars at 300 mm c/c
From the cross-section details, vertical bars12 mm dia @ 300 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((30 m- 0.05-0.05)/0.25)+1=(29.9/0.3)+1=101 No’s.
Cutting length =6.5m -top and bottom covers +2 hooks=6.5 m-0.05-0.07+2x10x0.012=6.62 m, where hooks length = 10 x d (dia of bars)
So total cutting length of 12 mm dia @ 300 mm c/c spacing bars =6.62 m x 101 no’s =668.62 m
So total cutting length of 12 mm dia bars = 852.66 m + 668.62 =1521.28 m
Unit weight of steel =dxd/162=12×12/162=0.88 kg/m,where d=dia of steel
So total weight of 12 mm dia steel =1521.28 mx 0.88 kg/m=1338.72 kg
10 mm dia Bars
10 mm dia Bars in wall
From the cross-section details,distribution bars 10 mm dia @ 300 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((6.5 m- 0.05-0.07)/0.3)+1=(6.38/0.3)+1=22No’s.
Cutting length =30 m -2 covers +2 over laps +6 hooks=30 m-0.05-0.05+2x40x0.01+6x10x0.010=31.3 m, where hooks length = 10 x d (dia of bars)
So total cutting length of 10 mm dia @ 300 mm c/c spacing bars =31.3 m x 22 no’s =688.6 m
10 mm dia Bars in Grade slab bottom mat
From the cross-section details,distribution bars 10 mm dia @ 250 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((0.75 m+0.6 m +0.3 m- 0.05)/0.25)+1=(1.6/0.3)+1=7 No’s.
Cutting length =30 m -2 covers +2 over laps +6 hooks=30 m-0.05-0.05+2x40x0.01+6x10x0.010=31.3 m, where hooks length = 10 x d (dia of bars)
So total cutting length of 10 mm dia @ 250 mm c/c spacing bars =31.3 m x 7 no’s =219.1 m
10 mm dia Bars in Grade slab top mat
From the cross-section details,distribution bars 10 mm dia @ 200 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((1.56 m+0.6 m +0.25 m- 0.05)/0.20)+1=(2.36/0.2)+1=13 No’s.
Cutting length =30 m -2 covers +2 over laps +6 hooks=30 m-0.05-0.05+2x40x0.01+6x10x0.010=31.3 m, where hooks length = 10 x d (dia of bars)
So total cutting length of 10 mm dia @ 250 mm c/c spacing bars =31.3 m x 13 no’s =406.9 m
So total cutting length of 10 mm dia =688.6 m +219.1 m +406.9 m=1314.6 m
Unit weight of steel=dxd/162=10×10/162=0.617 kg/m
So total weight of 10 mm dia steel =1314.6 m x 0.617 kg/m =811.10 kg
16 mm dia Bars
16 mm dia Bars in Grade slab bottom mat
From the cross-section details,distribution bars 16 mm dia @ 150 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((30 m-0.05- 0.05)/0.15)+1=(29.9/0.15)+1=200 No’s.
Cutting length =0.75 m+0.6 +0.3 -0.05+20×0.016=1.92 m, where hooks length = 10 x d (dia of bars)
So total cutting length of 16 mm dia @ 150 mm c/c spacing bars =1.92 m x 200 no’s =384 m
16 mm dia Bars in Grade slab top mat
From the cross-section details,distribution bars 16 mm dia @ 100 mm c/c spacing is utilised.
Number of bars = (Total length-clear cover/spacing) +1 =((30 m-0.05- 0.05)/0.10)+1=(29.9/0.1)+1=300 No’s.
Cutting length =1.65 +0.6 +0.25-0.05+20 x 0.016=2.77 m, where hooks length = 10 x d (dia of bars)
So total cutting length of 16 mm dia @ 100 mm c/c spacing bars =2.77 m x 300 no’s = 831 m
So total cutting length of 16 mm dia =384 m +831 m=1215 m
Unit weight of steel=dxd/162=16×16/162=1.58 kg/m
So total weight of 16 mm dia steel =1215 m x 1.58 kg/m =1919.7 kg
So total weight of 20 mm,12 mm,10 mm,16 mm=3583.06 kg+1338.72 kg+811.10 kg+1919.7 kg=7652.58 kg=7.65 MT
3. Cost estimation
The retaining wall cost estimation of RCC work and steelwork can be done by utilising its quantity and item rates.
The cost estimation rate of RCC M25 grade work using RMC vehicle excluding steel and its bending, including centring and shuttering is Rs 6500 /cum
So the cost estimation of RCC work =rate x quantity =6500 x 117 =Rs 760500
The cost estimation of steel rate only labour excluding material is Rs 10200 / MT
So cost estimation of Steel work=rate x quantity = 10200 x 7.65 =Rs 78030.(Cost of steel not considered)
So total cost estimation of retaining wall =Rs 760500+Rs 78050=Rs 838530
Add contingency to cost estimation of about 5% =838530×0.05=Rs 41926.5
So Total cost estimation of RCC retaining wall =Rs 838530 + Rs 41926.5 =Rs 880456.5
Conclusion :
So from the above mentioned 3 steps retaining wall cost estimation can easily be calculated.
Read more topics :
Great content! Super high-quality! Keep it up!
Thanks for posting. I really enjoyed reading it, especially because it addressed my problem. It helped me a lot and I hope it will help others too.
May I request more information on the subject? All of your articles are extremely useful to me. Thank you!
The articles you write help me a lot and I like the topic
Thank you for your articles. They are very helpful to me. Can you help me with something?
May I have information on the topic of your article?
Great content! Super high-quality! Keep it up!
The articles you write help me a lot and I like the topic
Thank you for your post. I really enjoyed reading it, especially because it addressed my issue. It helped me a lot and I hope it will also help others.
Thank you for sharing this article with me. It helped me a lot and I love it.
May I request more information on the subject? All of your articles are extremely useful to me. Thank you!
Thank you for your post. I really enjoyed reading it, especially because it addressed my issue. It helped me a lot and I hope it will also help others.
Hi, Neat post. There’s a problem with your website in internet explorer, would check this? IE still is the market leader and a good portion of people will miss your excellent writing due to this problem.
Thanks for posting. I really enjoyed reading it, especially because it addressed my problem. It helped me a lot and I hope it will help others too.
Thanks for your help and for writing this post. It’s been great.
I really appreciate your help
Your articles are very helpful to me. May I request more information?
Thanks for your help and for writing this post. It’s been great.
Thank you for your articles. They are very helpful to me. May I ask you a question?
Thank you for your post. I really enjoyed reading it, especially because it addressed my issue. It helped me a lot and I hope it will also help others.
Please tell me more about this. May I ask you a question?
Thank you for sharing this article with me. It helped me a lot and I love it.
Thank you for your articles. I find them very helpful. Could you help me with something?
Thank you for writing this post. I like the subject too.
Thank you for your articles. They are very helpful to me. Can you help me with something?
Your articles are very helpful to me. May I request more information?
Thank you for writing this article. I appreciate the subject too.
Good web site! I truly love how it is easy on my eyes and the data are well written. I am wondering how I could be notified whenever a new post has been made. I’ve subscribed to your RSS which must do the trick! Have a nice day!
Thanks for your help and for writing this post. It’s been great.
Thank you for writing this post!
You helped me a lot with this post. I love the subject and I hope you continue to write excellent articles like this.
Thank you for your articles. I find them very helpful. Could you help me with something?
Thank you for your articles. They are very helpful to me. Can you help me with something?
This design is spectacular! You definitely know how to keep a reader amused. Between your wit and your videos, I was almost moved to start my own blog (well, almost…HaHa!) Great job. I really enjoyed what you had to say, and more than that, how you presented it. Too cool!
Hello there, I discovered your site by means of Google even as searching for a comparable topic, your site came up, it appears to be like great. I’ve bookmarked it in my google bookmarks.
Hey! Would you mind if I share your blog with my facebook group? There’s a lot of people that I think would really appreciate your content. Please let me know. Many thanks
you have got an incredible weblog right here! would you wish to make some invite posts on my blog?
Hi! I could have sworn I’ve been to this blog before but after reading through some of the post I realized it’s new to me. Anyhow, I’m definitely delighted I found it and I’ll be bookmarking and checking back often!
Appreciating the time and effort you put into your website and in depth information you present. It’s great to come across a blog every once in a while that isn’t the same old rehashed information. Wonderful read! I’ve bookmarked your site and I’m including your RSS feeds to my Google account.
very nice publish, i actually love this website, carry on it
magnificent post, very informative. I wonder why the other experts of this sector don’t notice this. You must continue your writing. I’m sure, you’ve a huge readers’ base already!
Wonderful blog! I found it while browsing on Yahoo News. Do you have any suggestions on how to get listed in Yahoo News? I’ve been trying for a while but I never seem to get there! Appreciate it
You actually make it seem so easy with your presentation but I find this topic to be really something that I think I would never understand. It seems too complicated and very broad for me. I’m looking forward for your next post, I抣l try to get the hang of it!
My brother recommended I might like this blog. He was totally right. This post truly made my day. You cann’t imagine simply how much time I had spent for this info! Thanks!
Great website you have here but I was wanting to know if you knew of any community forums that cover the same topics talked about in this article? I’d really love to be a part of community where I can get suggestions from other experienced people that share the same interest. If you have any recommendations, please let me know. Thank you!
I have learn several just right stuff here. Definitely value bookmarking for revisiting. I wonder how so much attempt you put to make the sort of great informative website.
Great post. I was checking constantly this blog and I’m impressed! Extremely helpful information specifically the last part 🙂 I care for such info a lot. I was looking for this particular info for a very long time. Thank you and good luck.
you are really a good webmaster. The site loading speed is amazing. It seems that you’re doing any unique trick. Furthermore, The contents are masterpiece. you’ve done a great job on this topic!
Top site ,.. amazaing post ! Just keep the work on !
If I may, I’d like to let my uncle knows about this article so he can hire the right contractor to help him as fast as possible. I had no idea that the type of concrete can slightly influence the total expenses we need to have in order to build a retaining wall. He lives in a house near a deforested hill which has become more prone to landslide occurrence every time it rains nowadays and that poses a major threat towards his safety.