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Old 04-13-2011, 12:37 AM   #1
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help, brick walkway to traverse french drain


Hi,
I have perforated pipe in a gravel filled trench about 16"x 2ft. deep. running parallel to my driveway. We are considering pulling up the existing concrete walkway/sidewalk that goes from the front door to the driveway about 15 ft. away.
The trench goes under the existing sidewalk where it meets the driveway. There were frost heave issues with the driveway and I was trying to eliminate any water from being trapped under the apshalt drive. (see pictures).

What is the best way to bridge the gap since there will be nothing for the 2-3 spikes to grab into for the edging, and I need to prevent the smaller base gravel and sand from clogging up the drain tile.

Maybe using a piece of the existing sidewalk as a "bridge" over the trench and putting the 4" base and sand over that?
Or just repour the 4 ft. wide by 16" area over some treated plywood forms which bridges the trench (rather than maneuvering the old...heavy... sidewalk into position.)

Yet the edging spikes still won't have anything to "bite" in into other than the gravel for that 16" width. I guess if we repour and make a "bridge" I can make holes for the spikes to go into...?

Suggestions are appreciated!
Thanks!
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Last edited by D270; 04-13-2011 at 12:46 AM.
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Old 04-13-2011, 08:29 AM   #2
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help, brick walkway to traverse french drain


Forget the spikes to hold the edging in place over the trench. Drill the edging and run 5/8 allthread between the two sides. Use nuts and washers on both inside and outside of the edging. Use care when compacting the base where the allthread passes through it.

I would use filter fabric below the base to stop fines from migrating into the drain below.

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Old 04-13-2011, 12:43 PM   #3
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help, brick walkway to traverse french drain


Thanks....could you explain what 5/8" all thread is....sorry not familiar.
And would this go down into the concrete...or where..

Thanks
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Old 04-13-2011, 01:34 PM   #4
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help, brick walkway to traverse french drain


All-thread ... Steel rod with bolt threads the entire length. Find it in 10ft lengths at your local hardware or big box store, cut to length needed.

I don't see where any concrete would be needed. See graphic below ...

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Old 04-15-2011, 11:47 AM   #5
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help, brick walkway to traverse french drain


Ok, I have seen that...now I know what it is used for!

So you think landscape fabric, with the gravel base on top would compact ok, and last over the gravel trench?

Thanks again, great picture
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