Saturday, 10 October 2009
Climate Countdown
Thursday, 13 August 2009
Interpreter Needed

Latest Cabot eNews Published
Thursday, 7 May 2009
Cabot Tower
Historically, various attempts have been made to address similar faults in the structure with little success. Basically, the problem is that the weight of the upper portion of the tower is pressing downwards on the external walls, which due to a lack of ties in the original construction, is causing the stonework to be forced outwards.
It is evident from an analysis of the structure that remedial works have been carried out on at least two previous occasions during the past 100 years. However, the previous attempts made to address the problem were only partially successful, as the work concentrated on the effects and not the underlying cause of the problem. The current issues came to light approximately one year ago when new cracks appeared in the stonework surrounding the observation gallery on the upper levels of the tower. In the past, action had been taken to arrest any movement in the stonework by installing metal rods within the structure and repairing the cracks that appeared in the high-level stonework. However, over the years the metal ties have corroded, causing them to expand, which has exacerbated the problem.
The most important consideration in dealing with this problem is the Health and Safety of the general public. Therefore public access to the tower, and the surrounding area, has been restricted until the whole of the structure can be considered free of danger.
When the recent structural problems occurred, consulting engineers were engaged to advise on the possible causes and suggest ways in which the faults could be resolved on a permanent basis. Due to the complexity and specialist nature of the problem, a number of consultants declined to take on the work but eventually, a consultant was found who was confident that they could resolve the problems.
Subsequently, the consulting engineers were commissioned to undertake a full structural survey of the tower and to report on the extent to which the existing embedded metalwork had contributed to the problem. Their report confirmed that much of the embedded metalwork was badly corroded and that this was contributing to the overall structural problems. It took approximately three months for a specialist EH structural advisor to respond to the consulting engineers suggestions for rectifying the problems and a further two months for EH to attend a site meeting to discuss the implementation of the proposed works. During the intervening six-month period, the cracks in the stonework were closely monitored in order to assess if there was any on-going discernable movement within the structure.
EH stated that they would not allow any intrusive investigative work to take place without reference to the original structural drawings. Unfortunately, after considerable searching to unearth structural drawings of the tower, which included investigating possible locations suggested by EH, no structural drawings of the tower could be located.
EH then insisted that BCC employ a professional researcher from the Society of Architectural Historians to carry out an independent search. The person employed to undertake this work was Dr Sarah Wittingham, who took an additional 4 to 6 weeks to research the problem before concluding that no structural drawings were available.
As no records could be found, EH were asked to approve the solution recommended by our consulting engineers. The consultant’s advice was to dismantle small areas of stonework to expose some of the embedded metal ties, which were thought to be corroded and replace them with a stainless steel mesh, specifically designed to prevent any further movement within the structure.
After some delay, for which EH apologised, a meeting was convened in April this year. At this meeting, EH confirmed that their approach is one of minimal intrusion into the structure. They stated that they would only allow small sections of stonework to be opened up for inspection; they would not allow any of the embedded metalwork to be removed or any additional stabilizing rods/mesh to be installed at this stage.
Currently, discussions are continuing with all professional parties in order to agree the most appropriate way of restoring the tower to it’s original condition. The basic requirement of EH is that any solution must resolve the underlying cause of the problem, must be technically achievable without compromising the architectural design of the tower and must be totally acceptable to the EH structural advisor.
The conditions imposed by EH prevented the consultants proposed works from being implemented. Consequently, EH put forward an alternative suggestion that a solution should be considered that included stabilizing the existing embedded metalwork by cathodic protection. This action would prevent further corrosion of the imbedded metalwork but would not deal with the on-going structural integrity of the tower.
Subsequently a meeting was held with Bristol Contract Services in order to design a system of internal scaffolding within the spiral staircase of the tower that would allow access to the embedded metalwork without restricting access to the staircase from below. Due to the problems with access, each scaffold pole will have to be individually manoeuvred into place without being fixed to the internal stonework of the tower. This work has now been ordered and it is expected that this will take 2/3 weeks to complete.
EH have agreed to return at the end of June, when the ends of the embedded metalwork have been exposed, and make a decision on an overall solution for rectifying the problem.
Until EH have returned to site and inspected the exposed metalwork, they will not give their approval to any of the proposed rectification works going ahead. Consequently, we are currently unable to implement any of the proposals, as we cannot apply for listed buildings consent until the approval of EH has been obtained.
Assuming that EH agree to a solution in June, it is feasible that the tower could be reopened to the general public by the end of the year. However, if EH subsequently decide that further work is necessary, such as the introduction of chemical anchors or additional metal ties, the opening date will be further delayed, as this will be dependent upon EH giving approval to the implementation of their recommendations."
Tuesday, 31 March 2009
Colsten Street?!
Sunday, 29 March 2009
Paper
I was chatting with Peter Abraham the other day about paper, and how, in his many years as a councillors, the growth of IT has affected the amount of it which is created. His view was that today, even with e-mail and the internet, there is just as much of it as there has even been.Thursday, 26 March 2009
Mauretania
A few weeks ago, an e-mail was sent to me and Mark Wright about the neon Mauretania sign at the bottom of Park Street. The sign has been switched off for a few months now, and the person writing the e-mail was concerned that the owners of the building were not taking care of it.
