River Dargle Flood Scheme, Bray, Co. Wicklow: P1230526_a
River Dargle Flood Defence Scheme.
These images were taken during the first week of November 2016.
Meanwhile, at the Silverbridge site, adjacent to the N11 dual-carriageway:
We last visited here 2 years ago in November 2014, where bank stabilisation works involving excavation, repair and building of a support wall structure were being carried out by JONS Construction on behalf of the National Roads Authority.
We would occasionally catch sight of this work in the distance. Quite an impressive little piece of structural engineering.
Having built a retaining concave wall, backfilled for solidity, they were also drilling, fixing and sealing ground anchors to pin the entire structure together.
Now we see that further works are being undertaken.
Word has it that extra ‘stabilisation work’ has to be done to protect the integrity of the riverbank. At the section here we can see that there’s not much space between the edge of the rock face and the Armco at the side of the dual-carriageway.
Have yet to determine what precisely that will entail. Serious work to re-inforce the side access ramp down to the river.
Gabions consist of steel ‘baskets’ filled with rock pieces. They are filled and then fixed together to provide protection and strength to the existing river bank. They allow ground water to flow through them which helps prevent waterlogging of the bank behind them. Existing examples of these were used, back in 2012, to line the north bank of the existing riverbank adjacent to The Slang/Rehills stretch.
The N11 carriageway runs adjacent to this sunken side of the riverbank -- barely 2 (large) paces divide the two. Even with twin strips of Armco along the roadside, it's perilously close. Traffic speeds along this stretch (maximum speed 100 kmp). Only needs a touch from a heavy veicle to cause secondary impact, which (worst possible scenario) could result in something going airborne.
Working in these confined spaces puts a premium of safety and communication.
The guys have hard-filled a working shelf on the riverbed, to allow machinery access to the rockface. Obviously some serious drilling is called for before some form of extra 'pinning' is put in place.
They have sunk a series of hollowed tubes/casings -- obviously to form the basis for . . . . . .?
And some investigative work around the transverse buttress of the access bridge, parallel to the heavy-duty pipeline carrying water down from the Vartry reservoir.
River Dargle Flood Scheme, Bray, Co. Wicklow: P1230526_a
River Dargle Flood Defence Scheme.
These images were taken during the first week of November 2016.
Meanwhile, at the Silverbridge site, adjacent to the N11 dual-carriageway:
We last visited here 2 years ago in November 2014, where bank stabilisation works involving excavation, repair and building of a support wall structure were being carried out by JONS Construction on behalf of the National Roads Authority.
We would occasionally catch sight of this work in the distance. Quite an impressive little piece of structural engineering.
Having built a retaining concave wall, backfilled for solidity, they were also drilling, fixing and sealing ground anchors to pin the entire structure together.
Now we see that further works are being undertaken.
Word has it that extra ‘stabilisation work’ has to be done to protect the integrity of the riverbank. At the section here we can see that there’s not much space between the edge of the rock face and the Armco at the side of the dual-carriageway.
Have yet to determine what precisely that will entail. Serious work to re-inforce the side access ramp down to the river.
Gabions consist of steel ‘baskets’ filled with rock pieces. They are filled and then fixed together to provide protection and strength to the existing river bank. They allow ground water to flow through them which helps prevent waterlogging of the bank behind them. Existing examples of these were used, back in 2012, to line the north bank of the existing riverbank adjacent to The Slang/Rehills stretch.
The N11 carriageway runs adjacent to this sunken side of the riverbank -- barely 2 (large) paces divide the two. Even with twin strips of Armco along the roadside, it's perilously close. Traffic speeds along this stretch (maximum speed 100 kmp). Only needs a touch from a heavy veicle to cause secondary impact, which (worst possible scenario) could result in something going airborne.
Working in these confined spaces puts a premium of safety and communication.
The guys have hard-filled a working shelf on the riverbed, to allow machinery access to the rockface. Obviously some serious drilling is called for before some form of extra 'pinning' is put in place.
They have sunk a series of hollowed tubes/casings -- obviously to form the basis for . . . . . .?
And some investigative work around the transverse buttress of the access bridge, parallel to the heavy-duty pipeline carrying water down from the Vartry reservoir.