Post by JohnV on Jun 3, 2017 12:14:17 GMT
Due to my stranding a long way from the jetty, I have had to put my mind to a better way of getting on board than scrambling up a precarious ladder and squeezing through a gap in the rail by the bollards.
You may remember that a bit ago I built a gangway system for Sabina H that consisted of a 9 foot section that could be extended by a further 9 foot if desired.
SAM_0694-01 by mudlarker2, on Flickr
This unfortunately was not long enough to reach the jetty from where I have ended up.
As a result a further section was needed but this was taking the construction method beyond it's limits.
I thought that if I built some really temporary structure, sod's law would ensure that the tides would not make and I would have to use it until the winter ....... and it probably would have to be rebuilt anyway ....... so I decided to make something a bit more robust but still quick to strip out if the tides do make
I decided to build a separate 18 foot bridge section from the jetty using two truss sections vertically as supports, the uprights sitting on bit of scrap ply to prevent them sinking into the mud and supporting the deck sections with a rope catenary. The end nearest the jetty had an additional support of a truss section at an angle from the jetty with the other end supported by a wire strop from a strong point on the deck.
The two supporting towers were held vertical by being shackled to the handrail uprights.
the walkway was of 6mm ply (quite strong enough as it is only unsupported over 9") and has since been given a splash of paint with sand mixed in to make it anti slip
one of the 9' sections of gangway clips onto the end of that giving a gangway about 27 foot long
SAM_0698 by mudlarker2, on Flickr 
SAM_0699 by mudlarker2, on Flickr
You may remember that a bit ago I built a gangway system for Sabina H that consisted of a 9 foot section that could be extended by a further 9 foot if desired.
SAM_0694-01 by mudlarker2, on FlickrThis unfortunately was not long enough to reach the jetty from where I have ended up.
As a result a further section was needed but this was taking the construction method beyond it's limits.
I thought that if I built some really temporary structure, sod's law would ensure that the tides would not make and I would have to use it until the winter ....... and it probably would have to be rebuilt anyway ....... so I decided to make something a bit more robust but still quick to strip out if the tides do make
I decided to build a separate 18 foot bridge section from the jetty using two truss sections vertically as supports, the uprights sitting on bit of scrap ply to prevent them sinking into the mud and supporting the deck sections with a rope catenary. The end nearest the jetty had an additional support of a truss section at an angle from the jetty with the other end supported by a wire strop from a strong point on the deck.
The two supporting towers were held vertical by being shackled to the handrail uprights.
the walkway was of 6mm ply (quite strong enough as it is only unsupported over 9") and has since been given a splash of paint with sand mixed in to make it anti slip
one of the 9' sections of gangway clips onto the end of that giving a gangway about 27 foot long
SAM_0698 by mudlarker2, on Flickr SAM_0699 by mudlarker2, on Flickr
you could attach a cable to the anchor davit 
