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Cable Installation in ducting vs Direct Lay - Difference in planning terms?

3 replies [Last post]
Tue, 2013-10-01 09:49
Adam Garnham
User offline. Last seen 9 years 7 weeks ago. Offline
Joined: 3 Oct 2011
Posts: 23
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HI all,

I have a large programme for direct lay cable installation and have now been asked to create a ducted version. I'm not seeing any big differences between the two.

I would imagine you can lay all the ducting during excavation and backfill the trenchs and then pull the cable once all the ducting is in? Cant really see any other schedule alterations that would be required?

Feel like I'm missing a few tricks here so any advice very welcome.

 

Cheers

Adam

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Replies

Wed, 2013-10-02 06:02
#1
Mike Testro
User offline. Last seen 5 weeks 4 days ago. Offline
Joined: 14 Dec 2005
Posts: 4418
Groups: Building Information Modelling, Content Moderators, GPCCAR Editors

Hi Adam

Sorry your attachment did not open.

Of course pulling cables through a duct will take longer than laying cables in an open trench because you have two FS tasks instead of one..

Send me a private message so that I can recieve your file over email.

Best regards

Mike Testro

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Tue, 2013-10-01 11:51
#2
Adam Garnham
User offline. Last seen 9 years 7 weeks ago. Offline
Joined: 3 Oct 2011
Posts: 23
Groups: None

Hi Mike,

Thanks for the comments. I have pulling bays/winches/etc/etc in the plan for pulling the cable through the duct, what I am struggling with is the opinion this is a faster way to lay cable, in my programme it would mean pulling the cable once all ducting is in the ground, rather that intermitant pulls once each section is completed; so it actually extended the programme rather than reducing it. 

This is what I have for trenching and pull on a single section, would you agree with the tasks listed? Excuse all the FS-lag logic I need to correct this as not my doing.

1812
pppic.png

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Tue, 2013-10-01 11:03
#3
Mike Testro
User offline. Last seen 5 weeks 4 days ago. Offline
Joined: 14 Dec 2005
Posts: 4418
Groups: Building Information Modelling, Content Moderators, GPCCAR Editors

Hi Adam

There is a big difference between pulling cables through a duct and laying them in an open trench.

There is a limit to the length of cable that can be pulled in one go - depending on the size and type of cable.

Heavy cable will need a pull winch and intermittent pulling chambers are necessary.

The cost can be offset by not needing armoured cable.

Maybe they want a loose top precast U duct where the cables can be laid normally and the top place on before backfill.

Best regards

Mike Testro

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