Brunel Swivel BridgeBrunel's Other Bridge

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Brunel Swivel Bridge Project 2018

Brunel Swivel Bridge
Investigative work on the rotation of the bridge 2018

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Preparation and Basic Conservation

Our aim this year is to complete the repair of the turntable mechanism to a condition in which it can again turn for trial-turning to be carried out. Our planned work is: This is an ambitious target for 2018, so we need lots of help! Engineering experience is not essential as there is a wide range of tasks to carry out.

The track is an enormous wrought iron forging (about 14 ft diameter) probably made by rolling to a circle which must have been joined by fire-welding, ie, both ends being heated to bright-white heat and hammered together. Excitingly we believe we have located the joint, evidenced by diagonal lines in the working face. The forging is a complicated shape, remarkably accurate and a real tribute to the craftsmen who made it in 1849. We couldn't match this quality of manual forging nowadays.
It is an amazing example of heavy forge-work which should be preserved for future generations.

We plan to work one day per month, with extra days as necessary to maintain progress. We meet on the third or fourth Saturday in each month, as follows:

Sounds like fun? No experience needed, all equipment provided, and you'll get really involved in helping to save Brunel's Other Bridge. We need your help.

Contact Geoff Wallis (jandgwallis@gmail.com) if you wish to help. We need to have an idea of numbers.

Overall Details of work

Funding

As you know, the Bridge is listed Grade 2* and is on Historic England (formerly English Heritage) Buildings at Risk Register. Whilst their funding is severely restricted, HE have been supportive in providing modest grants to carry out trials and erect a temporary roof, which were completed by Bristol City and Avon Industrial Buildings Trust with volunteer help last year.

EH/HE were impressed with the Mann Williams (MW) report that resulted from the grant-funded work that we managed on behalf of the council in 2015 and suggested that we discuss an application for further investigative work on critical areas identified in the report as part of this year's Heritage at Risk programme. They also suggested that we might request further assistance in other areas via their consultancy budget and service.

Contracts will be let by the Avon Industrial Buildings Trust and supervised by their Technical team, comprising Bob Watkins and Geoff Wallis.

We want to thank Bristol City Council, English Heritage, the local amenity societies, our faithful hard-working volunteers, and huge number of supporters for getting the Project this far.

The big challenge lays ahead in securing major funding. We have a well-specified and costed scheme for repair which will form a sound basis for fund-raising.

You can make a donation by

The main donation link is: https://mydonate.bt.com/charities/brunelsswivelbridge.

We have created a project on http://www.neighbourly.com to also help us fund raise for our HLF bid

or you can send a cheque payable to
Avon Industrial Buildings Trust to:
The Treasurer, Thatched Wells, Duckhole, Thornbury, BS35 1LD.

Leaflet giving information, asking for support and how to make a donation

Progress in 2018

August 2018

Our next volunteer workday is this coming Saturday 18th August, and the weather forcast is reasonably good so we plan to make progress on the following: We are starting now at 9.30am at the Bridge. There is plenty of parking space and basic toilets are available. Please wear stout footwear, and you might like to bring overalls, gloves and something to kneel on. We have gloves, high-vis vest and a helmet you can borrow, and we provide tea and coffee!

Youngsters are welcome provided their guardians are in attendance full time please.

Looking forward to seeing you next Saturday.

4 August
21 July was a very productive (and fun) work-day, photos of which can be seen on the website

There are some additional tasks to carry out on the wheels now so we are holding TWO workdays in August, on Saturdays 4th and 18th. We need to make good progress whilst the dry weather holds, and the two dates will give those of us on holiday a second chance to help out!

The next workday is therefore at the end of next week, 4th, when we plan to fit BOTH the south wheels, trial-fit the central collar, and progress the painting. It would be really helpful if one volunteer could please 'meet and greet' visitors as it engages them and avoids those working on other tasks from being distracted.

We'll start at 9.30 am to make best use of the day. There is plenty of parking space and basic toilets are available. Please wear stout footwear, and you might like to bring overalls, gloves and something to kneel on. We have gloves, high-vis vest and a helmet for you to borrow, and we provide tea and coffee!

Youngsters are welcome provided their guardians are in attendance full time please.

Looking forward to seeing you on Saturday 4th.

Report 4 August
By 10.00 today we had the last 250Kg wheel out of Geoff's gropaning estate car, which could be heard sighing with relief! By 12.00 Bob, Geoff and Julian Baldwin had trundled the wheel to the centre of the Bridge on rollers, Egyptian pyramid-style, (but without the slaves) and lowered it into place below the deck. Meanwhile Julian Beel freed off the nuts holding down the bearing of the south west wheel, aligned it and settled it down on its new bronzes. The caps were refitted and the level checked against the adjoining north east bearing. It was about 5mm low so we'll prepare 5mm of copper packing to fit under the bronze shortly.

Ian helped with the wheel-move and then took on preparing the south east bronzes for installation. Julian and Geoff trial-fitted the newly-made collar bearing, and Julian took on the unpleasant task of sanding the rusty cast iron pintle clean, laying on his side in the pit under the Bridge(see July photos).

We were pleased to welcome young Bailey back again with his mum Anne. Bailey helped out with many tasks and finally fitted the new nuts on Julian's bearing using a giant spanner.

Photos of Progress Aug 2018 Well done everyone. See you on 18th August.

July 2018

Our next volunteer workday is next Saturday 21st July. We have lots of important items to progress as follows: As always we meet at 10.00am at the Bridge. There is plenty of parking space and basic toilets are available. Please wear stout footwear, and you might like to bring overalls, gloves and something to kneel on. We have gloves, high-vis vest and a helmet you can borrow, and we provide tea and coffee!

Youngsters are welcome provided their guardians are in attendance full time please.

Report
An intense and hot but very productive day today with all our most expert volunteers working at full tilt. Julian (Beel) and his team worked hard to fit the four lovely new bronze shells to the south west wheel's plummer blocks (those are the big cast iron chairs the bearings sit in). These fitted well but we have now discovered a slight misalignment between the two blocks, so next time we must free off the 'plummer blocks' which support the bronzes and realign them. This realignment is important because each wheel can potentially take many tonnes weight, and once the Bridge is back down on its turntable we can't get at the bearings!.

Chris Eade and his team fitted the new cast bronze ring around the central pintle around which the entire Bridge rotates. Chris valiantly sanded off the rust from the corroded pintle laying on his back under the Bridge, an unpleasant, dirty, dusty, noisy job. Well done Chris, and thank you (see photos). We proved that the new ring will fit, but Geoff has to dress away some excess material, and Chris will drill and tap holes for grease-nipples to be fitted so that we can lubricate the new collar in the future.

Ian and Geoff reclaimed the threads of the rusty holding-down bolts on the NW plummer blocks using our giant new die-nut, and then fitted enormous new nuts. These are 1 1/4 British Standard Whitworth nuts, with a thread developed by Joseph Whitworth in 1841, just eight years before Brunel designed the Swivel Bridge.

Maggie continued the visitor survey, weeded, and photographed, whilst Bob W, David F and Geoff W helped as necessary on the main tasks, whilst Julian Baldwin captured some good, professional-standard, video footage.

We were delighted to welcome the Kay family. 15 year old Charlie is expert at rigging the hoisting equipment now and had the 250Kg SW wheel raised in no time. Then he helped with all the aforementioned tasks, and was soon joined by his mum Polly and younger sister Daisy. Daisy was keen to prove that she could get into the cramped main structural boxes of the Bridge just as Charlie had done when he first visited site three years ago. Charlie has grown far too big to fit through the narrow entrance gap now, but Daisy managed it. However, Charlie then refitted the cover and stood on it, trapping her inside! (Big brotherly love!). Daisy was soon released no worse for her experience, see photos. We'll find a new space for you to climb into one day Charlie.

Charlie's Dad, Martin heroically sanded off the hut's Canary Yellow paint, a hot, dusty job which turned Martin bright yellow for a while! He and Daisy then applied more (white) paint and the south side of the shed now looks really smart.

As the weather is stable and there is so much to do we are holding two volunteer workdays in August, on Saturday 4th and 18th, starting at 9.30am. Do come and join us if you can.


Photos of Progress July 2018

June 2018

We are meeting next Saturday (23rd June) to continue our work on the Bridge, as follows: Report:

On a sweltering day we were happy to hide in the shade under the Bridge and beaver away at two main tasks. Out structural engineer Bob checked how much the new north-west turntable wheel stood above its neighbours, having been renewed with a new full-size casting. It stood 20 mm too high as the original had worn and its supports had been raised on steel packers. Julian, Ian and Bob used a gas-torch borrowed from our friends at Dorothea Restorations to free off the rusted nuts holding down the bearings, lifted the wheel with the chain -hoist and extracted all the packers. (photo attached). They cleaned out under the bearings, lowered the assembly and found that the wheel then levelled accross well with its neighbours.

Meanwhile Geoff was getting thoroughly dirty sanding rust off the turntable track-ring in readiness for painting. To everyone's amusement he emerged unrecognizably black, see photo. Maggie surveyed visitors, photographed and generally tidied up and swept out the base to assist those working in it.

Ian and Geoff finished off the day by painting half the little hut's south wall bright yellow, until beaten by the unrelenting heat of the scorching afternoon sun. Its not often one can say that in England!
Photos of Progress June 2018

May 2018

Workday We next meet on Saturday 26th May to continue our work on the Bridge, as follows: As always we meet at 10.00am at the Bridge. There is plenty of parking space and basic toilets are available. Please wear stout footwear, and you might like to bring overalls, gloves and something to kneel on. We have gloves, high-vis vest and a helmet you can borrow.

Youngsters are welcome provided their guardians are in attendance full time please.

Report: A misty day.

Recently we have made good progress towards recommissioning the turntable wheels as we work towards getting the Bridge rotating again. Two new bronze bearings and a huge bronze ring have been delivered by a local foundry (see photo) and these will shortly be going off to our friends at Croft Engineering for machining.

On the May Bank Holiday Saturday nine faithful volunteers completed some useful tasks. Ian and David heroically laid on their backs and took it in turns to needle-gun rust off the underside of the turntable, an unpleasant, arm-aching task that dropped rust in their faces. They did the job to a high standard so that in June we can complete the detailing and put on a coat of paint. Well done chaps, and thank you again.

14 year old Charlie is now so expert at rigging and operating the chain-hoist (under supervision) that he had the south-west wheel lifted clear of its bearings in no time, and then Julian Beel used his considerable skills as a grinder-artist to sculpt its new bronzes to fit their cast iron beds. Charlie then moved on to investigating and cleaning the control-pits, and removing the tarmac obstructing the tail-wheel track. To our surprise this revealed a 25mm step at a joint in the track, so we now have more work to do! Meanwhile Charlie's dad Martin expertly prepared and painted the south side of the little shed with professional results.

Maggie surveyed, photoed and weeded with Martyn, whilst Julian Baldwin videoed, and Geoff helped out generally. Thank you all for your hard work. See you on 23rd June.
Photos of Progress May 2018

April 2018

We meet again next Saturday 21 April to continue our work on the Bridge, as follows: As always we meet at 10.00am at the Bridge. There is plenty of parking space and basic toilets are available. Please wear stout footwear, and if wrestling with the wheel or bearings you might like to bring overalls, gloves and something to kneel on. We have gloves, high-vis vest and a helmet you can borrow.

Youngsters are welcome provided their guardians are in attendance full time please.

A lovely warm day brought out lots of volunteers, and renewed enthusiasm for getting Mr. B's Bridge turning again. We welcomed a newcomer Jeff, all the way from Cambridge, welcome.

Bob's team including David, Martyn, Charlie and Jeff rigged the lifting gear whilst Geoff's team lifted off the bearing caps on the north east bearing, levered out the bottom bronzes and thoroughly cleaned everything. The recently skimmed 300 Kg wheel was hoisted out of Geoff's car and onto its frame, trundled along the Youngman's board track and lowered into place effortlessly, due in no small measure to young Charlie who led much of this operation himself. Well done Charlie, you are a remarkably mature and practical engineer for your age.

Meanwhile Charlie's dad Martin was turning 'shabby-shed' into 'shabby-chic' by scraping off loose paint, patch-priming the bare wood and undercoating between the rain storms. Martin was ably assisted by Maggie, Anne and young Bailey in his wonderful new red mini-coveralls, red hard hat, red socks and high-tech gloves. Shed 149 has started to look more cared for now, thanks to your hard work.

Julian Beel borrowed his employer's gas-cutting equipment (thank you Dorothea) and freed up the bolts securing one of the SW wheel's bearing blocks. He realigned it and re-tightened the nuts, so that we are now ready to fit the bearings during the May vols day.

Thanks for photographing and doing some survey work Maggie, disrupted eventually by the Portway being closed, and thank you Julian Baldwin for videoing us again.

At the end of the day we placed a straight-edge across the tops of the NW & NE wheels and found 15 mm difference, so now we'll have to seek the reason for this misalignment, which appears to have been long-standing. Just the latest mystery!

Come and join us on 26th May, the week after the royal wedding.

Photos of Progress Apr 2018

March 2018

Sat 31 March. Our next workday is nearly upon us, and there's lots to do: The weather forecast for our 'Soggy Saturday' workday was not promising, but our volunteers were undeterred by drizzle and their enthusiasm was not dampened. We were very pleased to be able to shelter under our hut. It kept us dry and out of the wind. We swiftly completed our main tasks in just four hours, at which point the weather improved! . Bob, David, Martyn and Ian wrestled the 300 Kg. north east wheel from its bearings, wriggled it sideways from under the turntable, hoisted it up, and trundled it along the Youngmans boards Egyptian-pyramid style using rollers and slaves. (Actually, no slaves !). Then David did sterling work de-rusting the wheel with our new needle-gun before it was loaded to Geoff's groaning estate. It will now be delivered to Croft Engineering in Fishponds for skimming.

Meanwhile, Maggie, Julian Beel and Geoff persuaded the bronzes out of their housings on the south east wheel's bearing blocks so that they can be cleaned and dressed to fit the skimmed wheel-shaft. Julian Baldwin was on hand to video this stage of the work. By the way, Julian recently entered his video of the manufacture of the new NW wheel into an international competition and did well, so congratulations Julian.

Finally, Ian Kerr unveiled his Meccano and polystyrene model of the 'setting gear' which sets the Bridge deck at the correct level on the north bank of the Entrance Lock. (See this months photo). Ian has made and exhibited a giant Meccano model of the Swivel Bridge, so the setting gear completes the model.

We should have two wheels ready to re-fit next workday, so do come and join us on 21st April.
Photos of Progress in March 2018

February 2018

Our first workday of 2018 is on Saturday 17th Feb. when we have lots of interesting tasks to carry out. As always we meet at 10.00am at the Bridge. Plenty of parking space and basic toilets are available. Please wear stout footwear, and if wrestling with the wheel you might like to bring overalls, gloves and something to kneel on. Also, it can be chilly next to the river in February so please wrap up well. We have gloves, high-vis vest and a helmet you can borrow.

Bob W, David F, Maggie S, Geoff W and new expert volunteer Julian Beel enjoyed working together in lovely February sun, videoed by our professional-standard media-man Julian.
Our first aim was to install the newly machined 300 Kg.wheel delivered to site in Geoff's long-suffering down-at-the rear estate car. We did this with ease, using our shiny new steel gantry which sits over each wheel-position and provides a 'sky hook' for us to hoist from.
Our new young volunteer Bradley helped operate the chain hoist, spread grease on the bearings for protection and other tasks, supervised by mum Anne. Thank you guys, your help was appreciated. You'll make a great engineer one day Bradley!

We then turned our attention to the south east wheel which wasn't so easy to extract as the headroom is lower. We had to do a 'fox-trot' move by lifting the wheel, rotating it laterally, moving it sideways, and then lifting it out. Fortunately there was about 10mm to spare, but it was fiddly working under the bridge.
We have become experts now at moving the wheels along the deck on their frames using rollers, and can even go up and down a step.

Bob, David and Geoff had a think about how to strengthen the severely corroded beams that carry the weight of the deck above the turntable.
We decided that a series of oak 'pit-props' was the best solution, tightened by folding wedges. Finally we laid down under the structure, and brainstormed a way of centralizing the deck using new bronze bearing blocks, so now we have lots of work to get on with this year. Come and help us!'

Photos of Progress in February 2018

Look at the reports page to see the summaries of the results of inspections of the bridge. Updated 11 January 2016

Photos of Progress in 2018


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