Improvements in the Mode of Constructing Concrete Buildings.
Year: 1891

page_text: Date of Application, 14th Nov., 1891
Complete Specification Left, 10th Aug., 1892-Accepted, 24th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Mode of Constructing Concrete Buildings.
Í GEORGE JACKSON of 21 Brocklebank Road Earlsfield in the County of
Surrey Builder do hereby declare the nature of this invention to be as follows:-
My invention consists in a new method of erecting concrete walls by which among
other advantages I am able to a great extent to dispense with the apparatus usually
required and I save the labor of finishing the external and internal surfaces or
either of them.
The method in which my said invention is performed consists in forming the wall
of slabs of concrete which form the inside and the outside of the wall and in filling
up the space between the slabs by running in concrete. I form the concrete slabs
with a finished facing on one side if desired and with one or more dovetailed joggles
on the other side, which bond with the concrete when that is run in after the slabs
have been placed in position and I form projecting fillets or tongues and corre
sponding grooves along the four edges of each slab so that when the slabs are placed
in position the tongues of one shall fit into the grooves of the adjoining ones.
slabs I place vertically in parallel planes to receive between them rough concrete
so as to form solid concrete walls faced or not as desired without using any
apparatus such as boards as usually employed when building concrete walls.
The
cast such concrete slabs in a mould of which Figure 1 is a plan and Figure 2 a
longitudinal section through Figure 1 at X Y. Figure 3 is a transverse section of
the mould when laid on a bench ready for filling and Figure 4 is a section of the
mould through Figure 1. at e. e. or e. Figure 5 shews a portion of a wall in process
of being built.
The bottom of this mould is formed of a sheet of glass zinc or other suitable
substance of a suitable size and thickness according to the size of the slab required;
this bottom is most conveniently not attached to the mould but laid on a horizontal
surface and the mould place and temporarily fixed over it. The sides of the mould
marked c and d Figures 1 and 3 may be formed of wood about two inches deep
and about one and a half inches wide. The mould shewn in Figure 2 is constructed
for casting two slabs at one operation. I cast the slabs as follows. If it is desired
to make a slab with a smooth face I place a sufficient quantity of facing material
such as neat Portland cement on the bottom of the mould so as to cover the whole
of the bottom of the mould to a depth of about an eighth of an inch. I then fill up
the remainder of the mould including the spaces between h. h. on Figures 1 and 2
(which form the joggles) with rough concrete leaving a rough surface on the top
side as the mould lies so as to form a good key on the inner surface of each slab so
that the concrete which will be poured in when the slab is placed vertically may
bind with it. If each slab be allowed to remain in the mould until the cement and
concrete are properly set it will be found to have on the surface next the glass
zinc or other suitable bottom of the mould a surface exactly corresponding to the
bottom of the mould which may be perfectly smooth or figured or roughened as
desired.
Having made a sufficient number of the said slabs and having laid the usual
foundations for the walls I proceed to erect the building by fixing two rows of slabs
in a vertical position opposite each other at the required distance as shewn by
Figure 5. then fill up the space between the two rows of slabs with rough
concrete. The notched wood or iron cleat marked d on Figure 5 may be placed
across the slabs at intervals so as to keep them parallel and at a proper width until
the space between them has been filled up with concrete and allowed to set but no
other apparatus is necessary as this cleat and the joints before described hold the