- 14 Jun 2011
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Due to ground subsidence (possibly where a tree was removed 3 years ago) an area of my baseboard sagged by about 30mm or more, this led to a large dip in the track with wagons uncoupling as the passed over the high points at either end and rainwater ponding in the low points in the centre.
Amount of sag
Initially I thought I was faced with the prospect of digging up the centre supporting posts and raising the base board to level it off.
Further inspection revealed that the lattice frame supporting the area had bowed in the middle due to the centre supports sinking so the whole section would require replacement. This looked like turning into a major bit of work.
Offending lattice piece
After a bit of thinking I came up with the idea of leaving everything in place and building an embankment across the area which would raise the track and make the it level.
I have started by obtaining a level for the track using a couple of string lines I then leveled up the track using spacer blocks.
The section where the sag has occurred
Spacer blocks
I intend to build the embankment using acrylic render mixed with some fine gravel, to save the amount of render needed and to reduce the weight.
I plan to put in a couple of low bridges this will allow the water to run under the track and into drainage hole drilled through the baseboard.
In these holes I plan to put in some wicks to break up the water surface tension at the side of the holes and allowed water to flow down them into the garden below.
Amount of sag
Initially I thought I was faced with the prospect of digging up the centre supporting posts and raising the base board to level it off.
Further inspection revealed that the lattice frame supporting the area had bowed in the middle due to the centre supports sinking so the whole section would require replacement. This looked like turning into a major bit of work.
Offending lattice piece
After a bit of thinking I came up with the idea of leaving everything in place and building an embankment across the area which would raise the track and make the it level.
I have started by obtaining a level for the track using a couple of string lines I then leveled up the track using spacer blocks.
The section where the sag has occurred
Spacer blocks
I intend to build the embankment using acrylic render mixed with some fine gravel, to save the amount of render needed and to reduce the weight.
I plan to put in a couple of low bridges this will allow the water to run under the track and into drainage hole drilled through the baseboard.
In these holes I plan to put in some wicks to break up the water surface tension at the side of the holes and allowed water to flow down them into the garden below.
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