Project Updates

BLASTING UPDATES

Next Blast:

M11 Cut 1 – Friday 27-04-2018 at 2.00pm

 

 

What is happening now?

The whole country has been affected by the extreme weather conditions of the last few months since the beginning of 2018,  and our project was also heavily affected. Our joint venture took all the necessary measures to protect our workforce during these events by shutting down all operations, but also  recommenced works after the storms had passed.

  • The majority of Earthworks have been completed for the M11 & N30 sections of the scheme, with some works remaining, mainly in the N80 Link Road section.
  • Excavation of rock by means of blasting at the locations of Clogh, are soon due to be completed and each blast is closely controlled and monitored by our site staff and specialists. This material is being processed and stockpiled in order to be reused at structures,  as well as in the final layers of the road pavement.
  • In the same area the new Junction works are at a stage where Temporary Traffic Management will be put in place in order to allow for the connections from the new road to the existing M11. In this first stage the hardshoulder close to the existing Clogh Junction of the Southbound carriageway is now closed off, and will be used by construction traffic.
  • The new road alignments for Ballyeden, Glenteige in M11 as well as Coolnahorana, Ballyorril and Bessmount in N30 have opened to traffic and more are expected to reopen during the Second and Third quarter of 2018 including Dunsinane in N30, Tinacross ,Drumgold and Corbally in M11 .
  • All access Structures have been completed which allow us to maintain access for the local landowners in the areas where works are ongoing. Also all the new culverts are in place and the streams running through them have been diverted.
  • Drainage works for the carriageways are well underway and many subcontractors have started working on our site in order to help us meet our time schedule.
  • Pavement works have also commenced and their outputs are steadily increasing with the help of the weather improvement as the summer approaches and the longer daylight hours.
  • 13 Bridges have been completed to date and another 15 are currently under progress.

 

 

 

 

 

 

 

River Slaney Bridge – N80 Structure 1

The new river Slaney Bridge is the longest bridge of our project (~154m) and one of the most challenging parts for our Joint Venture. Extensive design, construction methodology and procurement of all the structural components was required, as well as a big effort from our teams here on site in order to bring to reality  all these ideas.

The new Bridge is crossing over both River Slaney and the existing railway on the east side of the river and is a three span bridge. The two abutments are built as reinforced earth walls, and the two intermediate piers consist of 8 columns with a height of approximately 6m.

 

 

 

 

 

 

 

In the cross section above you can also see that foundation piles were required with depths up to 15m at the intermediate piers and abutments in order to increase the stability of the structure, which is being built on the banks  of the river that are also prone to flooding.

 

 

 

 

 

For the same reason, the area behind the West Abutment required the installation of 10 arch culverts which allows for flood water to flow through the plain and not affect the structural integrity of the bridge and the road above.

Back to our main structure; 12 steel beams in total were erected in place, 4 beams for each of the 3 spans of the structure. Each beam consists of a pair of steel girders which are connected together laterally with cross  bracings, and with bolts longitudinally in order to increase the stiffness of the deck (as shown below).

 

 

 

 

 

 

 

 

 

 

For the installation of the beams a crawler crane with a capacity of 360tn was required. During each lift and while the beams are still suspended by the crane, workers with harnesses had to do all the bolted connections. After this operation was completed the crane would release carefully the beams which now form a single truss structure resting on specially designed bearings at the two abutments and the two intermediate piers.

On the top of these beams permanent prefabricated formwork will be placed and reinforced concrete will be poured which will form a composite structure (of steel and concrete). A final surface for the pavement will be placed after that in order to allow for the traffic to travel over the river and railway line.

 

 

Below is a summary of expected works over the coming months:

Q2 2018
  • Well Monitoring/ Noise and Vibration Monitoring
  • Minor Remaining Earthworks
  • Drainage
  • Minor Structures Works – Repairs and Snagging
  • Side Road Works
  • Pavement Works
  • Junction Works

 

Q3 2018
  • Well Monitoring/Noise and Vibration Monitoring
  • Minor Remaining Earthworks
  • Drainage
  • Minor Structures Works – Repairs and Snagging
  • Side Road Works
  • Pavement Works
  • Junction Works

 

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