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Showing posts with label staircase locks. Show all posts
Showing posts with label staircase locks. Show all posts

Sunday, June 10, 2012

The Bunbury Shuffle

I`m sure the boaters amongst our readers know how a staircase flight works but me and Jaq have many friends and family back home who have no clue. Some of our readers might be new boaters who will enjoy the post. So experienced boaters are excused reading this post; feel free to do the washing up or carry on knitting.
Bunbury staircase locks are the first locks after leaving Nantwich on our journey to Chester. This staircase is made up of two locks and raises/lowers the Shropshire Union canal 15 feet, 7 inches.
Picture 1
There are two lock chambers, and three sets of double gates. The gates in the foreground of the picture above separate the two chambers. The boat in picture 1 above is coming into the top lock to go down. Normally we would encounter just one lock, as you see it in the top picture. We would lower the water level, open the bottom gates and carry on our way. The difference here is two lock chambers to be negotiated. So in picture 2 below I have turned around and I am looking down at the second lock which has one boat entering to go up.

Picture 2
The difference in canal levels from the top lock in picture 1 to the bottom lock in picture 2 is as I mentioned, 15 feet, 7 inches and it will take two courses of action for the boats to swap places. With all gates shut the water is released from the top lock (Pic 1) into the bottom lock (pic 2). This will make the water level in both chambers equal.

Picture 3
In  picture 3 above, the boats are passing each other as they switch places. The gates they are passing through are the ones in the foreground of  picture 1.

So now on the left is the top lock  (picture 1). The boat has come half way on it`s climb and will now let water in to raise it the rest of the way. The boat on the right is in the bottom lock as in picture 2, and will now let water out, lowering it down.

 Things are slightly different when three boats want to use the locks at the same time. Two boats coming down and one going up is possible as is one down and two up. This then becomes the "Bunbury Shuffle".
On the left two boats have come down in the top lock together and one boat has come up on its own. The gates are being opened between the locks. As in picture 3 above, the boats must now swap places so it is time to do the "Bunbury Shuffle". On the right above, one boat going down moves forward and into the vacant space next to the boat going up. The single boat facing us comes into the vacated
space, below left. The last boat then
moves forward, below right. The first boat in has moved across the lock to make this manoeuvre easier for the last boat in. The gates will now close and the two locks will be filled or emptied to take the boats to the upper or lower sections of the canal.

Monday, April 09, 2012

Onto the Llangollen

Hurleston Junction and we leave the Shropshire Union and turn into the first of  4 locks lifting us 34feet up to the Llangollen Canal.
By the time we reach the Welsh town of Llangollen we would have travelled 44 miles and gone through another 17 locks rising us another 109feet.  Amongst those 17 are 3 staircase locks at Grindley brook.
A  staircase lock is 2 or more locks where the upper gate of one lock serves as the lower gate of the next.
Click HERE to see the video of Grindley staircase locks working.


So on we go the picture shows us in the 1st lock having just risen from the Shropshire Union in the picture above. Jaq is walking on to prepare the next lock while I will bring the boat forward and close the gates behind me.
The original plan was a canal linking the River Mersey via Chester and Wrexham to the River Severn at Shrewsbury. The section from the Mersey to Chester was built as was a section up to Frankton locks(now part of the Montgomery). Finance and land purchase issues stopped the original plan and the canal eventually joined the main canal system here at Hurleston in 1805 where Chester can be reached.



At bridge 6 Burland it was good to see the shop had re-opened. Locally made pies on display looked scrummy and Jaq purchased a Steak & Ale plus a Chicken & Mushroom. Highly recommend them folks.
Just a few doors past the stores this neat turntable makes for a safe exit  from a small driveway. The driver just spun the car on the turntable and reversed off ready to safely drive out instead of reversing into a quite busy road.










NB Valerie & Steam Train by Les Biggs

NB Valerie & Steam Train by Les Biggs