Improvements in and relating to the Manufacture of Paving Material and Slabs.
Year: 1896

page_text: Date of Application, 19th May, 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
Improvements in and relating to the Manufacture of Paving
Material and Slabs.
I, HUGO SCHNEIDER, of Strasburg-Kronenburgh, Oberhausberger Strasse 72,
in the German Empire, Contractor and Quarry Master, do hereby declare the
nature of this invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:-
My invention relates to the manufacture of paving material and slabs.
In the manufacture of my improved paving material I use approximately
fifty-five parts of prismatically hewn stones, seven parts of pulverized granite,
thirteen parts of gravel, eighteen parts of natural asphalt and seven parts of
bitumen.
For paving floors, streets and the like, I mix the natural asphalt, pulverized
granite, gravel and bitumen so as to obtain a pulp, which is heated in closed vessels
for about three hours. The surface to be paved having been covered with a layer
of concrete, I pour some of the boiling mixture upon this concrete to form a thin
layer for the reception of a certain quantity of comparatively large prismatic
stones, which are pressed into this soft layer so that their bases nearly touch each
other. Then the spaces between the said prismatic stones are filled up with more
of the boiling mixture, to which smaller prismatic stones and coarse gravel are
added. When the tops of the large prismatic stones have thus been covered the
surface is planed and levelled.
By this means I obtain a hard, impervious and durable material which will
always present a rough surface, ensure a noiseless traffic, and prevent the growth
of fungi. Owing to these properties it is particularly suitable for laying floors of
cellars, breweries, stables, baths and the like, as well as for paving streets.
According to my said invention I also use this improved material in the
manufacture of paving slabs, chiefly designed for covering such parts of the street
or ground as have subterranean pipes, channels or other conduits which require to
be rendered easily accessible. For this purpose it is expedient to employ such
paving slabs in conjunction with concrete slabs in lieu of the layer of concrete
serving as a support for the permanently laid parts of the pavement.
The concrete slabs, intended to be laid one behind the other in the direction of
the pipes or conduits underneath, are made with wooden frames, which may for
instance have a length of one and a half metres, a width of one metre, and a height
corresponding to the thickness of the layer of concrete covering the other parts of
the street or ground. Their bottoms and their long sides are covered with
pasteboard to isolate them from the surface they cover and also from the adjoining
layer of concrete. Flat irons embedded transversely in the concrete slabs,
preferably in or near their middle, serve to strengthen these slabs in order to
obviate the breakage of the same in their removal from the ground. The concrete
slabs are covered with pasteboard at their upper surface to isolate them from the
before mentioned paving slabs, which are produced by pouring the improved
material on the top, these paving slabs being separated from the other paving by
flat irons provided on both their long sides, and from each other by flat irons
arranged at intervals corresponding to the length of the concrete slabs, but so as
to obviate the co-incidence of the joints. All the joints are made perfectly tight
with the aid of cement.
As these paving and concrete slabs are isolated from each other and from the
other parts of the pavement they may be easily removed from their place in order

page_text: to afford access to the pipes or conduits in the ground below, and may be put back
with equal facility, the joints being again rendered tight with cement, so that repairs
or inspections may be effected in a very short time.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. A paving material consisting of natural asphalt, pulverized granite, gravel,
bitumen, and prismatic stones, mixed in or approximately in the proportions
herein before stated.
2. For paving floors, streets and the like, a material consisting of a mixture of
natural asphalt, pulverized granite, gravel and bitumen, which is heated and
poured upon a bed of concrete to form a layer into which prismatic stones are
pressed, the spaces between the latter being then filled up with a further quantity
of the said mixture together with prismatic stones and gravel, substantially as
herein before set forth.
3. Paving slabs consisting of a mixture of natural asphalt, pulverized granite,
gravel, bitumen and prismatic stones, and isolated by flat irons, in combination with
framed concrete slabs strengthened by flat irons and isolated by pasteboards,
substantially as and for the purposes herein before set forth.
Dated this 19th day of May 1896.
PHILLIPS & LEIGH,
No. 22 Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.