INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Guidelines for Maximum allowed height of temporary shoring with out tie-backs

Guidelines for Maximum allowed height of temporary shoring with out tie-backs

Guidelines for Maximum allowed height of temporary shoring with out tie-backs

(OP)
Can anybody guide me to "Guidelines for temporary shoring wall" design.
I am trying to find the max allowable height with no tie backs. Also some best practices and design guidelines.
Thanks a bunch

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

Seems like too many variables here to come up with a general rule of thumb...

Pile size, pile spacing, active and passive pressures, surcharges, bridging effect reduction, concrete encasement, if any, to name the most relevant...

Mike McCann, PE, SE (WA)


RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

As Mike said, it depends. 12' is a good height to start considering bracing or tieback anchors. If the wall needs to be a bit taller. try sloping the top few feet and cantilevering the remaining 12'.

Added 12/30/2016
There are many engineers who will design cantilevered walls up to 20 or more feet high. While you can always find heavy enough and long enough soldier beams or SSP to cantilever this high, the performance may be questionable (too much lateral deflection means too much settlement behind the wall) and the extra steel and installation cost may be more than the cost of lighter, shorter, more closely spaced, soldier beams or SSP with tieback anchors added.

www.PeirceEngineering.com

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

You may want to look at the CA Trenching and Shoring Manual. Some member of this forum recommended it in the past and found it very useful and practical. There is a chapter for unrestrained shoring systems. Also there are some guidelines about temporary retention systems.

Here is the link for the manual:

http://www.dot.ca.gov/hq/esc/construction/manuals/...

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

(OP)
Thanks guys.

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

It ain't about the wall. It's about the equipment ya got to build it.

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

I prefer slopes. thumbsup2 If you insist on a wall, I second the calfornia trenching and shoring manual for sheet piles and soldier pile and lagging. I have used SupportIt computer program with pretty good success. Don't think about cantilever walls over 15 feet.

There are lots of other wall options depending on your project requirements. Cut or fill wall? It is a pretty endless subject if you don't provide the specifics for your particular project.

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

Wow. 12 feet, 15 feet.

I have succesfully finish couple projects with 6m, 7m, 9m (30 feet?) . Last one was in a hard limestone and pile socket was 9m too. Total displacement of the retaining system was 4cm!

Maybe it is because of different practices in different countries, however, I don't think this is engineering. We have to be bold.

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

I am not saying that deeper, cantilever walls cannot be designed and built. Sometimes they are the only possible or allowable solution. However, compare the cost for an extra tall, extra stiff, cantilevered wall with the cost of a tiedback or braced wall with much less steel, less drilling, and a greater soldier beam spacing. We do not have to be bold; we do have to consider cost.

www.PeirceEngineering.com

RE: Guidelines for Maximum allowed height of temporary shoring with out tie-backs

Yes, PEinc younare dedinetely right.

For me, I use cantilever walls when I do not have any other choice or I need a permanent shorinf. I am not such a fan of permanent anchors, I do not trust most of the contractors in this issue. So using cantilever walls for permanent applications makes me feel more confident.

But as you said, cost comparison is another thing.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close