Ross-on-Wye

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Ross-on-Wye

The Flood Alleviation Scheme Work 2008

17th May 2008

Homs Road
The view from the Rope Walk (17-05-08)
The acoustic barrier (Click for a larger image)

The tunnelling works have been stepped up to run 24-hours a day for the next eight weeks to make up for time lost due to problems with the tunnelling machine. Contractor Morgan Est started the 24-hour working this week to hopefully make up the time so the scheme can be completed in September as was planned. The 24-hour working will be confined to weeknights with the work halted on Saturday and Sunday nights.

The delays have been due to the "teeth" on the 50m long tunnelling machine as they have not been able to cope with the variety of rock types encountered underground. Each set of teeth are designed for a specific rock type and are much less efficient when used on other types. The initial surveys done predicted much greater consistency in the bedrock.

Homs Road site (17-05-08)
Homs Road site
(Click for a larger image)

As reported in the Ross-on-Wye Journal2, Herefordshire Council's project manager Martin Jackson said:


"We have looked at alternatives to 24-hour working but have found this will be the best method of making up the lost time and ensuring the works are completed as near to the contract date at the end of September."

He said the main problem had been that the ground had been "different" to what was expected so the teeth chosen for the tunnelling equipment had not been breaking down the rocks efficiently.


"We made an assessment about which teeth to use, but the rocks are different - they are more mixed. We were perhaps expecting it to be more consistent than it is - the right configuration is needed."

Limits on noise for night-time working were written into Morgan Est's contract in case this situation arose. Noise levels are going to be monitored by Herefordshire Council to ensure that compliance with the limits is maintained. In order to reduce noise, various other measures have been put in place such as toning down alarms on the crane as far as safety will permit and keeping surface vehicle movements to a minimum. An acoustic fence has also been erected alongside the brook (as seen in the photo above) to further lessen any noise. Mr Jackson said:


"The cranes have audible warnings, similar to the reversing noises of large lorries. We have changed these so they are less piercing and the acoustic fence will also provide a noise barrier."


Fiveways

The sluice area is now being worked on with the end of the culvert being completed. An access scaffold has been added so that access to the bottom of the culvert can be reached.

The end of the culvert at Fiveways (17-05-08)
The end of the culvert at Fiveways
(Click for a larger image)

The photo below was a night shot taken showing the end of the culvert prior to it becoming flooded.

The culvert (14-05-08)
The culvert
(Click for a larger image)

16th May 2008

Kings Acre

Because the weir into the falling shaft is to be below ground level, the top of the shaft needs to be removed.

In order to do this the sides of the shaft need to be excavated so that the top can be removed.

The falling shaft (16-05-08)
The falling shaft
[Courtesy of Nuttall's]
(Click for a larger image)
The falling shaft (16-05-08)
The falling shaft
[Courtesy of Nuttall's]
(Click for a larger image)

The Chase Brook (16-05-08)
The Chase Brook
[Courtesy of Nuttall's]
(Click for a larger image)

The brook that runs across the bottom of the Chase grounds used to join the Rudhall Brook at Kings Acre. As a result of the works it has been diverted so that it now joins into the culvert. Because this brook also ran down a small culvert that was in very poor condition, this has been excavated so that a new pipe can be laid.


Broadmeadows

In this shot, the Broadmeadows both the temporary (foreground) and new bridges (behind) over the brook can be seen. The temporary bridge is due to be removed.

The Broadmeadows Industrial Estate bridge (16-05-08)
The Broadmeadows Industrial Estate bridge
[Courtesy of Nuttall's]
(Click for a larger image)

The Bund
Lorries arriving at the bund (16-05-08)
Lorries arriving at the bund
[Courtesy of Nuttall's]
(Click for a larger image)

A stream of lorries have been arriving at the bund to deliver and remove various materials to and from this area as the works continue.


The main walls of the throttle have been cast. The only areas that remain to be done are the areas over the opening.

The throttle (16-05-08)
The throttle
[Courtesy of Nuttall's]
(Click for a larger image)

The throttle side (16-05-08)
The throttle side
[Courtesy of Nuttall's]
(Click for a larger image)
The throttle front (16-05-08)
The throttle front
[Courtesy of Nuttall's]
(Click for a larger image)

13th May 2008

Fiveways
The new culvert (13-05-08)
The new culvert
[Courtesy of Nuttall's]
(Click for a larger image)

The area has been further cleared ready for continuing works.


Shuttering has been placed and concrete poured to form the base.

The new base for the end of the culvert (13-05-08)
The new base for the end of the culvert
[Courtesy of Nuttall's]
(Click for a larger image)

12th May 2008

Fiveways
The diverted stream (12-05-08)
The diverted stream
[Courtesy of Nuttall's]
(Click for a larger image)

Because work is being carried out in the sluice area, at the exit point of the new culvert, the stream has been diverted to keep it well away from the work area.


The sides around the end of the culvert need to be dug out so that the final concrete end can be created.

The sluice area (12-05-08)
The sluice area
[Courtesy of Nuttall's]
(Click for a larger image)
The end of the culvert (12-05-08)
The end of the culvert
[Courtesy of Nuttall's]
(Click for a larger image)

The gravel and dirt that has fallen down the sides has been removed ready for further works to be carried out.

The cleared end of the culvert (12-05-08)
The cleared end of the culvert
[Courtesy of Nuttall's]
(Click for a larger image)

Kings Acre
The old culvert grate (12-05-08)
The old culvert grate
[Courtesy of Nuttall's]
(Click for a larger image)

The grate off the old culvert has been put to the side awaiting removal.


Homs Road

This is the acoustic wall (or acoustic barrier) as seen from the Rope Walk and from within the Homs Road site.

The Homs Road wall (12-05-08)
The Homs Road wall
[Courtesy of Nuttall's]
(Click for a larger image)
The accoustic wall (12-05-08)
The acoustic wall
[Courtesy of Nuttall's]
(Click for a larger image)

11th May 2008

Fiveways
Fiveways site (11-05-08)
The Fiveways site
(Click for a larger image)

The sluice area (11-05-08)
The sluice area
(Click for a larger image)

The Kings Acre car park site at Fiveways has been cleared. The large crane has gone and the spoil clamp etc has been removed.

A large pipe has been placed in the Rudhall Brook to guide the water past the old slice area.

Fiveways/Kings Acre car park area (11-05-08)
Fiveways/Kings Acre car park area
(Click for a larger image)

Broadmeadows
The Broadmeadows Bridge (11-05-08)
The Broadmeadows Bridge
(Click for a larger image)

The Broadmeadows bridge is now complete and is regularly in use now that the caravan park is open for the summer.


The Bund
The Bund Throttle (11-05-08)
The Throttle in the Bund

The Throttle (11-05-08)
The Throttle
(Click for a larger image)

The throttle is well under way with its construction.


9th May 2008

Kings Acre

The old culvert has now been replaced with a concrete slab base and the end of the new culvert.

The old culvert has been replaced (09-05-08)
The old culvert has been replaced
[Courtesy of Nuttall's]
(Click for a larger image)

The Bund
The throttle wall (09-05-08)
The throttle wall
[Courtesy of Nuttall's]
(Click for a larger image)

This is a view of the left-hand front wall. The rear wall is being prepared so that the shuttering can be put up around it.


2nd May 2008

Kings Acre

Being as this crane is not currently needed, it is being removed. The crane has had its jib removed so that it can be more easily transported.

Crane leaving site (02-05-08)
Crane leaving site
[Courtesy of Nuttall's]
(Click for a larger image)

The Bund
The throttle (02-05-08)
The throttle
[Courtesy of Nuttall's]
(Click for a larger image)

The shuttering is now being manoeuvred around so that it can be used to form another one of the walls.


1st May 2008

The Bund

One wall has been cast and the shuttering has been removed. The stepped face has been done as the banks will be built up to the level of the stepping and then the wall will be faced with stone or a similar material.

One wall has been cast (01-05-08)
One wall has been cast
[Courtesy of Nuttall's]
(Click for a larger image)

30th April 2008

The Bund

The works at the throttle are rapidly progressing.

The left-hand side of the throttle (30-04-08)
The left-hand side of the throttle
[Courtesy of Nuttall's]
(Click for a larger image)
The right-hand side of the throttle (30-04-08)
The right-hand side of the throttle
[Courtesy of Nuttall's]
(Click for a larger image)

29th April 2008

Homs Road
Looking down into the rising shaft (29-04-08)
Looking down into the rising shaft
[Courtesy of Nuttall's]
(Click for a larger image)

This is the view down the rising shaft at Homs Road. The track that the train runs on, with engine is in the back shunt, can be clearly seen along with the tunnel ventilation system that runs down the shaft in the top left of the shot. The bottom left are the services, such as power and water, to the tunnelling machine. To the top right are water pumps and pipes coming up the shaft to allow any water that seeps into the shaft to be pumped out. At the top is the access tower that allows the engineers to climb down into the shaft.


In this area can be seen the trucks used to remove the spoil from the tunnelling. To the left can just be seen the sections that are used to form the tunnel walls.

The Homs Road area (29-04-08)
The Homs Road area
[Courtesy of Nuttall's]
(Click for a larger image)

28th April 2008

Kings Acre
The end of the old culvert (28-04-08)
The end of the old culvert
[Courtesy of Nuttall's]
(Click for a larger image)

This is the remaining part of the old culvert that ran from Broadmeadows to Fiveways as seen from the Broadmeadows end. The grate that prevented access to the old culvert can be seen in the middle of the shot. It is clear that very little remains of the culvert and this will soon be replaced.

The digger is backfilling over the top of the new culvert as it makes its way from Kings Acre towards Broadmeadows.


At the throttle, the preparation and construction of the shuttering is continuing.

The throttle (28-04-08)
The throttle
[Courtesy of Nuttall's]
(Click for a larger image)

25th April 2008

Kings Acre
The completed bottom of the falling shaft (25-04-08)
The completed bottom of the falling shaft
[Courtesy of Nuttall's]
(Click for a larger image)

The slab has been poured and the base of the falling shaft has been completed.

The hole in the base, top right, is there so that there is a low point in the bottom of the shaft so that water will collect there so that it can be pumped out.

In order to prevent foul water building up in the tunnel any water that seeps into the tunnel or the falling and rising shafts will be pumped out. It has to be remembered that this tunnel will only be used very occasionally; during extreme flooding situations.


The Bund

The work at the throttle has continued and more reinforcing has been positioned along with more shuttering in preparation for the concrete to be poured.

The works at the throttle (25-04-08)
The works at the throttle
[Courtesy of Nuttall's]
(Click for a larger image)
The shuttering at the throttle (25-04-08)
The shuttering
[Courtesy of Nuttall's]
(Click for a larger image)

24th April 2008

Fiveways

This crane, supplied by Ainscough, has been used to move various items around the site.

An Ainscough crane (24-04-08)
An Ainscough crane
(Click for a larger image)
Ainscough crane (24-04-08)
Ainscough lorry
(Click for a larger image)

This Ainscough lorry has come to collect ballast weights that were used with the crane on the Fiveways site.

An Ainscough lorry (24-04-08)
An Ainscough lorry
(Click for a larger image)
The Ainscough lorry (24-04-08)
The Ainscough lorry
(Click for a larger image)

Broadmeadows
The Broadmeadows bridge west parapet (24-04-08)
The Broadmeadows bridge west parapet
(Click for a larger image)

The Broadmeadows bridge parapets are now complete as can be seen in this pair of photos.

The Broadmeadows bridge east parapet (24-04-08)
The Broadmeadows bridge east parapet
(Click for a larger image)

23rd April 2008

Broadmeadows

The channel between the Broadmeadows Bridge at the caravan park and the Broadmeadows Industrial Estate Bridge has been completed.

The Broadmeadows channel (23-04-08)
The Broadmeadows channel
[Courtesy of Nuttall's]
(Click for a larger image)

The work at the throttle is continuing with the various parts of the shuttering being positioned.

The Broadmeadows channel (23-04-08)
The throttle
[Courtesy of Nuttall's]
(Click for a larger image)
The throttle walls (23-04-08)
The throttle walls
[Courtesy of Nuttall's]
(Click for a larger image)

22nd April 2008

Kings Acre
The bottom of the falling shaft (22-04-08)
The bottom of the falling shaft
[Courtesy of Nuttall's]
(Click for a larger image)

The reinforcing steelwork has been positioned in the bottom of the falling shaft and the concrete slab will be poured in thus forming the base.


The Bund

Shuttering is being erected so that the walls of the throttle can be poured.

Shuttering being positioned to form the walls of the throttle (22-04-08)
Shuttering being positioned to form the walls of the throttle
[Courtesy of Nuttall's]
(Click for a larger image)

21st April 2008

Kings Acre
Work continues in the falling shaft (21-04-08)
Preparation work continues in the falling shaft
[Courtesy of Nuttall's]
(Click for a larger image)

The bottom of the falling shaft is having reinforcing steel put in place. This is ready for the concrete slab, that will form its base, to be poured.


The Bund

Work on building the Throttle, which is the cut out in the bund that controls the rate of outflow of water, has continued and the foundations for the side walls are being laid.

The Throttle

The Throttle is built in a similar way to a dam. It comprises of a tunnel of a size that will not allow more water out from behind the bund than the channel through Ross can handle. It then has concrete side walls, that limit the erosion of the bank due to the flowing water, front and back which are then separated by a layer of clay which acts as a water barrier.

Work continues at the throttle (21-04-08)
Work continues at the Throttle
[Courtesy of Nuttall's]
(Click for a larger image)
Throttle construction (21-04-08)
Throttle construction
[Courtesy of Nuttall's]
(Click for a larger image)

16th April 2008

Kings Acre

Since it was sunk, the falling shaft has been pumped out to ensure it does not get flooded.

Additionally the point where the tunnel from the rising shaft in Homs Road has been prepared.

The inside of the falling shaft (16-04-08)
The inside of the falling shaft
[Courtesy of Nuttall's]
(Click for a larger image)

The inspection hatch for the bifurcation chamber (16-04-08)
The inspection hatch for the bifurcation chamber
[Courtesy of Nuttall's]
(Click for a larger image)

The bifurcation chamber has been covered over and the only remaining visible part is the top of the inspection hatch.


10th April 2008

Broadmeadows Industrial Estate

This is the new bridge on the Broadmeadows Industrial Estate. The temporary bridge that has been used during the works is to the right.

The new Industrial Estate bridge (10-04-08)
The new Industrial Estate bridge
[Courtesy of Nuttall's]
(Click for a larger image)

9th April 2008

Fiveways
The final part of the old culvert (09-04-08)
The final part of the old culvert
[Courtesy of Nuttall's]
(Click for a larger image)

The final section/the end of the old culvert is about to be finally removed. Light can be seen through the remaining part thus showing exactly how little remains.


31nd March 2008

Fiveways

This is the remaining section of the old culvert from Broadmeadows to Fiveways. A small amount of water from the brook can be seen flowing out of the culvert and into the area to be occupied by the new culvert.

Water flowing out of the old culvert (31-03-08)
Water flowing out of the old culvert
[Courtesy of Nuttall's]
(Click for a larger image)

22nd March 2008

Broadmeadows
Broadmeadows bridge wall (22-03-08)
Broadmeadows bridge wall
(Click for a larger image)

As must have been the target, the bridge at Broadmeadows was completed far enough to allow the caravan park to open for the Easter weekend. The caravan park was busy with a large mix of touring motor homes and caravans.

Above is one of the new brick built walls of the bridge. Below left is one of the large pumps that have been used to drain the water out from this area the site whilst the construction continues in the bottom water channel. Below right is the upstream side of the new bridge over the Chatterley Brook1.

One of the massive pumps (22-03-08)
One of the massive pumps
(Click for a larger image)
The new Broadmeadows bridge (22-03-08)
The new Broadmeadows bridge
(Click for a larger image)



next Flood alleviation Flood alleviation work 2007 previous


1 The brook referred to as the Chatterley Brook is actually a unnamed brook that flows from Weston-under-Penyard past Chackley Grove. It has only recently become referred to as the Chatterley Brook and locally it was previously known as Chackley Brook.

2 Flood Work Hit By Weak Teeth Ross-on-Wye Journal - Wednesday May 14, 2008


[Page updated: Feb 15 2011 13:31:59]






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