Previous in Forum: Plasticity Index and Plastic Limit of Soil   Next in Forum: Foundation Pilling
Close
Close
Close
15 comments
Rate Comments: Nested
Commentator

Join Date: Jul 2007
Posts: 61

Forming LARGE Concrete Walls

04/06/2010 7:37 PM

I am getting ready to bid on some concrete work, and am in need of some advice on forming large walls. They will be supporting mining equipment, the largest of which is a primary crusher weighing 365 tons. The wall structures I have found for similar equipment have been roughly 25' high, 40' long, and 10' thick. The plans have not been released for bid yet, they are due around the end of the year, but I wish to get a head start on planing this project. There will be five main structures in all, with about the same wall thickness and height. I wish to find a form system which can be quickly placed once the re-bar is assembled, so while the 1st structure is being formed, the 2nd and 3rd can be having the re-bar tied, the 4th's footing being poured, and the 5th's footing re-bar is being placed. Any help in this matter will be greatly welcome, and probably profitable for all involved, if a suitable system is found.

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
Guru

Join Date: Oct 2007
Location: Transcendia
Posts: 2963
Good Answers: 93
#1

Re: Forming LARGE Concrete Walls

04/06/2010 10:31 PM

You can either use steel sheets for the forms, or plywood forms. Sounds like steel forms for the pour would work out, for otherwise you may well need to work harder to keep the plywood from blowing out.

Not an expert. Just been involved in building and know some of the principles.

__________________
You don't get wise because you got old, you get old because you were wise.
Register to Reply
Guru

Join Date: Oct 2007
Location: Transcendia
Posts: 2963
Good Answers: 93
#3
In reply to #2

Re: Forming LARGE Concrete Walls

04/07/2010 9:00 AM

Nice links on the subject. Looks like you're the expert.

__________________
You don't get wise because you got old, you get old because you were wise.
Register to Reply
Guru

Join Date: Jan 2010
Posts: 2446
Good Answers: 60
#4
In reply to #3

Re: Forming LARGE Concrete Walls

04/07/2010 9:19 AM

thanks

Register to Reply
Guru

Join Date: Jan 2010
Posts: 2446
Good Answers: 60
#5
In reply to #3

Re: Forming LARGE Concrete Walls

04/07/2010 10:49 AM

do i get paid ??

Register to Reply
Guru

Join Date: Oct 2007
Location: Transcendia
Posts: 2963
Good Answers: 93
#6
In reply to #5

Re: Forming LARGE Concrete Walls

04/07/2010 10:12 PM

Figure it's worth 200 bucks an hour for such demonstrable knowledge as a consultant. Figure an hour minimum whether it took you 15 minutes or a full hour. So the GA may be rated as worth 200 bucks. I'm sort of going by my experiences, as a designer, director, and inventor, on a particular job, where I got to where I made 1 hundred and 96 dollars an hour, after practice.

Most money I made per hour, was about 1,750, but that was for acting, which proves you can make a lot of money if you are willing to make a fool of yourself.

Around here on CR4, it is extremely unlikely you will get paid.

How things are valued, and what there real value is, and whether or not you get the money, can be very different things.

Couple of weeks ago a painting I did was sold for 20 bucks. Depending on how much of a fool I make of myself will determine later how much the buyer, or their family might find the investment to be of aid.

Around here I do hope I have helped people, for I have been helped, so I figure it is a wash, mostly, sort of, other than in those cases where I was outside the place contacted, and actually worked to a point where I said, "Either pay to play, or go away." Typically then they go away without paying.

It would be interesting to value every GA on the site at a rock bottom of 15 bucks, and add it up, to see what that figure was as far as any reflection of the overall value of the site.

We can be sure that now and then, sometimes, we en masse have either helped people get jobs done correctly for nothing, and on occasion prevented deaths or fires.

A product, or set of products that CR4 could sell day in and day out would be Grounding Rods, for instance.

__________________
You don't get wise because you got old, you get old because you were wise.
Register to Reply Off Topic (Score 5)
Member

Join Date: Jun 2009
Location: Shell Canada's Albion Sands Project in Northern Alberta
Posts: 7
Good Answers: 1
#8
In reply to #2

Re: Forming LARGE Concrete Walls

04/07/2010 11:30 PM

The first two links are forming companies using PERI forms. http://www.peri.ca/en/company.cfm

__________________
Out of my mind, back in 5 minutes...
Register to Reply
2
Member

Join Date: Jun 2009
Location: Shell Canada's Albion Sands Project in Northern Alberta
Posts: 7
Good Answers: 1
#7

Re: Forming LARGE Concrete Walls

04/07/2010 11:18 PM

Given the specifications I would strongly suggest you look into PERI concrete forms. PERI is the biggest provider and manufacturer of formwork and scaffolding systems in the world. They offer top notch consultation (generally free), and their forms are truly second to none. http://www.peri.ca/en/company.cfm This is the Canadian Link but you can navigate to your region with the drop down menu on the upper right hand corner of the page. You could also look into steel ready forms (previously suggested), the pencil rod tensioning systems inherrent to these forms provide great holding power under the loads specified but the finish isn't as good as the PERI's, nor is the ease and speed of assembly. I wouldn't suggest the plywood systems (called cam locks) for your needs, they require an engineer to design the system for you (because of the large loading of your project). They tend to be slower to assemble as the plywood sheets need to be drilled on site for the loop ties, and these systems are prone to blowouts if they aren't assembled by carpenters proficient with this type of system. Further as far as I know loop ties for the Cam Locks aren't available beyond four feet, although I could certainly be wrong as I am not aware of all of the different manufacturers specifications. Good luck

__________________
Out of my mind, back in 5 minutes...
Register to Reply Good Answer (Score 2)
Anonymous Poster
#9

Re: Forming LARGE Concrete Walls

04/08/2010 1:59 AM

Dear Contributor,

You are very wise ,even at the : bidding stage, to investigate early. No doubt the Client will have already obtained geo-technical advices and more than likely : core drilling of the sites. From experience the advice you have obtained and the address of the Form supplier and Contractors , from others , are all : extremely sound and timely.

I would suggest that you look at what foundations are being planned. More so if the nature of the soil is such that it will require piling to support these walls . Particularly with long term pounding/vibration of crushing equipment . These are, from experience , the punishing tests . Not only of the walls but of the footings and underground support. The integrity of what is above is totally dependent on the work that has been done : below.

Repetitive pours look big , but good site organisation and planning takes care of that. You and your Company do not want to be around if in 5 or 7 years the walls are sinking ! Concentrate first on the foundations.

Good preparation is 80% of execution .

Labor Omnia Vincit

Register to Reply
Power-User

Join Date: May 2006
Posts: 142
Good Answers: 3
#10

Re: Forming LARGE Concrete Walls

04/08/2010 8:58 AM

Contact efco. They will engineer the forms and rent you all the form components. I like their system better than simmons and the rest. They can take the plans and give you exactly what you need and instruct you in the most economical way to handle it. They have people with years of field experience and can quote aci off the top of their heads.

Register to Reply
Guru

Join Date: Jan 2010
Posts: 2446
Good Answers: 60
#11
In reply to #10

Re: Forming LARGE Concrete Walls

04/08/2010 9:12 AM

no need to shout!!

Register to Reply
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4362
Good Answers: 179
#12

Re: Forming LARGE Concrete Walls

04/08/2010 11:21 AM

The various postings about consulting with the form work manufacturer's is dead-on solid.

IF you've already been hired to do the foundation work then I would strongly advise that you somehow obtain in advance the Geotechnical Engineering Report and all finalized foundation plans and details from the Engineer of Record. IF the work is going out to bid and you're one of the bidders, then I would doubt you'd get the necessary information from the EOR.

Also, please keep in mind that each of these reinforced concrete foundations most likely could be classed as a large monolithic concrete placement, which dictates that you're going to have to provide some means of keeping the concrete cool-----please refer to ACI code regarding this matter as it'll factor in heavily in your final cost tally.

Just my 2 Cents for what it's worth.....

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply Off Topic (Score 5)
Guru

Join Date: Oct 2007
Location: Transcendia
Posts: 2963
Good Answers: 93
#13
In reply to #12

Re: Forming LARGE Concrete Walls

04/08/2010 11:55 AM

I'm curious about why you need to keep the concrete cool, and whether or not you mean all the time forever, or just in the initial stages of the "placement". On a relatively small foundation pour, the opposite was the case and I had to go get foiled insulating blankets from the Concrete supply company. Was a cold weather situation.

__________________
You don't get wise because you got old, you get old because you were wise.
Register to Reply
Guru

Join Date: Jan 2010
Posts: 2446
Good Answers: 60
#14
In reply to #13

Re: Forming LARGE Concrete Walls

04/08/2010 12:19 PM

heat effects the hardening/curing process and reduces the finished strengh

Register to Reply
Commentator

Join Date: Jul 2007
Posts: 61
#15

Re: Forming LARGE Concrete Walls

04/08/2010 2:37 PM

Thanks to ALL who responded! I will investigate the links mentioned, and let you all know how it works out!

Thank You Again!

Register to Reply
Register to Reply 15 comments

Good Answers:

These comments received enough positive votes to make them "good answers".
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); CaptMoosie (1); CFECO (1); CONWAYMECH (1); JamesD70 (2); peterg7lyq (5); Transcendian (4)

Previous in Forum: Plasticity Index and Plastic Limit of Soil   Next in Forum: Foundation Pilling
You might be interested in: Bar Code Software

Advertisement