Timber retaining wall with tieback and deadman

[fargofarmer]

Does anybody know how to design a timber retaining wall with tieback and deadman? Can I get reference anywhere? My wall height is approximately 4.5 feet.

thanks

 

[msquared48]

At only 4.5 feet high, why would you need deadmen? I [laced [4X posts at 5 foot centers, buried 2 feet in the ground and cast concrete around them and they are still intact after 25 years. No deadmen needed.

Mike McCann
MMC Engineering

 

[oldestguy]

Usually no one does a design. However there are some pretty good ideas on the Internet, such as "this old house video" on U-Tube for general ideas. That particular video by the landscaper obviously is not engineered, but roughly OK. I'd try to consider the zone of earth that is within the wall height x that width back as needing retaining. So any dead man should go beyond that zone. Sloping back the wall some does a significant job in making it more stable.

 

[msquared48]

The problem is finding suitable cadavers that will not degrade with time.

Mike McCann
MMC Engineering

 

[oldestguy]

I should add, no design usually for low height walls. Sometimes commercial suppliers of wall materials will have recommended practices, etc.

 

[PEinc]

Maybe the attached 1966 paper will help you with the timber wall. Maybe AWPI also has a newer version of this publication.

www.PeirceEngineering.com

 

[SlideRuleEra]

Here is another paper for "Retaining Walls for Residential Applications":

http://www.finlayson.com.au/downloa...ng_walls_for_residential_applications0306.pdf

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[RFreund]

Do yourself (owner) a favor. Use a segmental retaining wall instead.

EIT

http://www.HowToEngineer.com

 

[fargofarmer]

RFreund,

I prefer segmental walls. But, some builders want to save money. I don't know how much they can save. The answer I commonly get from the builders is that the timber walls being constructed for long time and they can stand several years. I believe there may be some way to design these walls. Anyhow, thanks for your input.

PEinc,

Thank you for the paper. I think some of the pages are missing in that paper.

Thanks

 

[PEinc]

Sorry, the pages were out of order. Here it is again with the correct page order.

www.PeirceEngineering.com

 

[RFreund]

Fargo - I hear you but the timber wall will last how long? Where as the block should last much longer. The whole tieback method to me is very suspect. I mean you you have all these 'hinges' along the wall face where the timbers are nailed together. I mean sure you can calc the required deadman but how do you justify the pressure on the facing? I mean what is the lagging spanning between? I have only once seen drawings but no calcs.

Anyway, good luck. I'd be interested to know what you find.


EIT

http://www.HowToEngineer.com