we have used precast concrete lintels in the past, in order to reduce the size of an i.c. aperture. double them up to be sure.
you could then at some stage you lid an all could drop down through the hole.Or i could make a frame *inside* the hole to the size of my man hole tray then pour concrete in till it sets. [/u]
marshman said:lower your biscut hight to allow for brick course / courses
then corbel the bricks in to hole size needed.
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