Repair Update – 8-11-2017

Little Switzerland Road repair progress:

Tons of dirt has been excavated.  The photo below shows the excavator at the far (downriver) end of the wall loading the dump truck with the last of the dirt from the upper level.  About half of the 32 top-level anchors are installed and cemented (or grouted) in place as of today.  Three 75′ anchor cables and a 75′ PVC pipe are placed inside a 75′ corrugated pipe.  The PVC pipe is for pumping the grout into the hole so it fills from the inside-out.   Two more 75′ PVC pipes are inserted outside the corrugated pipe.  One is used to pump grout around the outside of the corrugated pipe.  The other is used, after the grout has set, to pressurize the end of the hole to fracture so it flares out to cause a larger grip on the inside end.  Another steel beam (waler) is attached to the wall and the anchors to complete the grip on the other end.  The beam also aids in tension testing of the anchors.

Waler and grout holds top-level anchors in place
Waler and grout holds top-level anchors in place

The grouting plants (cement mixer-looking equipment) are on the roadside; above the drilling area.  Due to hose length restrictions, equipment is moved downriver as the anchor hole driller moves.  The next section to be drilled is the narrowest part of the road which will restrict traffic flow.

Grout Plants - equipment to mix grout
Grout Plants – equipment to mix grout

Next, the excavator will move back to this end (upriver) to scrape another 8′ layer below the top-level anchors.  Another row of 32 anchors, slightly shorter than 75′, will be installed in the same way as the first.  Around the same time, a 10′ ditch will be dug down the center of the road for the drain pipe installation.

installing anchors
installing anchors and the waler

The work crew has been very good to work with us to minimize road closures although full-day road closures are becoming inevitable again.  Kevin Bowles, with Obec Engineering, has been instrumental in keeping the residents apprised and avoiding traffic jams and frustrations.  We would never have been able to secure access, in this way, to our properties without grants from FEMA and Oregon IFA and extensive engineering help from Steve Hodge\Lincoln County Public Works.  Gratitude keeps us patient through the inconvenient times.


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