Improvements in Bridge-flooring, Decking, Roofing, Fire-resisting Constructions and the like, and in Material for use therein.
Year: 1891

page_text: Date of Application, 16th Feb., 1891
Complete Specification Left, 16th Dec., 1891-Accepted, 16th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Bridge-flooring, Decking, Roofing, Fire-resisting
Constructions and the like, and in Material for use therein.
I JOHN VICTOR BOYD-WILSON of 2 Victoria Mansions Westminster in the
County of Middlesex Engineer do hereby declare the nature of this invention to
be as follows:
:-
The object of my invention is to provide more ready and effective means for
forming bridge floors or decking, fire resisting flooring and other constructions
of a like nature and for this purpose I propose to use a channel beam or girder
of a peculiar section so as to enable the webs to butt close against each other
and to be bolted or rivetted together if desired and in combination with such
beams or girders a concrete formed of special material and in blocks of special
shape or section.
I prefer to use beams or girders of a semi-circular oval or semi-elliptical section
the crown being thickened and in some cases flat on the top or with a bulb on
the under side or the section may be as that of a pointed arch with or without
a bulb or thickening at the apex in all cases however the lower extremities of
the webs terminate vertically and have internal flanges; thus the section is an
arch springing from the upper portions of two right angles facing each other
inwardly thus LJ.
I prefer to form my special concrete or filling of a material known as
"Kieselguhr" either alone or in combination with Portland or other cement and
suitable aggregate in certain proportions and this mixture I term Kieselguhr
Concreto.'
$6
I suspend from the L shaped flanges of the beams blocks of a double T shape
having the centre portion sufficiently wide to fill in between the flanges and the
lower 1 flanges longer than the upper so that the whole fit close together when
in place. I fill in over and all round the beams or girders with the concreto
as before described. Or I may place the beams or girders at distances apart from
each other and form the suspended blocks of a different section; thus instead
of the lower inverted | section carry down the central part of the block and
form at the bottom thereof outwardly extending splays capable of carrying other
blocks suspended between them. The spaces are then filled in and the beams
or girders surrounded and covered with the special concrete before described.
For very light floors (fire-resisting) I use blocks moulded of suitable materials
in the forms of the beams or girders as centreing and fill in over and all round
these blocks the concrete before described and I may suspend from the ___shaped
flanges of these moulded blocks used as centreing the blocks of a double T shape
and either with or without the blocks having splay bottoms.
This form of construction may also be applied to Mansard and pitched roofs,
piers, corridors, balconies, walls, partitions, etc., and for roofing I prefer to use thin
hollow blocks of "Kieselguhr" or other approved concrete.
Dated this 16th day of February 1891.
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Bridge-flooring, Decking, Roofing, Fire-resisting
Constructions and the like, and in Material for use therein.
I JOHN VICTOR BOYD-WILSON late of 2 Victoria Mansions Westminster in
the County of Middlesex and now of 178 St. Vincent Street in the City of
Glasgow, County Lanark Engineer 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 :-
The object of my invention is to provide more ready and effective means for
forming fire-resisting constructions such as floorings of buildings, deckings of piers
and the like bridge flooring, and for other purposes of a similar nature, or, for
roofing.
In carrying out my said invention I propose to employ channel beams or girders
of a peculiar section so that the webs may abut close to each other.if desired and
in combination with these a concrete specially prepared in blocks of peculiar shape
and section as shewn on accompanying sheet of drawings referring to which
Figure 1. is a section shewing one method of construction with concrete blocks
of double T section.
Figure 2. is a section shewing a heavier flooring or construction the concrete
blocks being of different section and
Figure 3. is a section of channel beam or girder rolled out flat before being bent
or drawn to shape shewn by dotted lines.
I prefer to use beams or girders rolled as channel iron and as shewn in Figure 3
and then bent or drawn into semi-circular, oval or semi-eliptical section or shape as
shewn by dotted lines or by A. A. B. B Figures 1 and 2 the metal being in some
cases flat on the crown or it may be thickened out as A¹ or have a bulb on under
side as B¹ the lower extremities of the webs are vertical as at C. C and terminate
in internal flanges D. D. These channel or arched beams or girders are supported
on suitable bearings across the space to be floored or covered, either close together
as Figure 1. or at distances apart as Figure 2. and from or upon the flanges D. D.
I suspend or form concrete blocks of double T section such as E. E. over and
between the metal beams I fill up to the requisite height with concrete F the
whole of which filling as well as the concrete blocking is composed as hereafter
described. The lower flanges of the blocks are longer than the upper T so as to
meet or nearly so under the metal as at E' Figure 1. and the whole of the under-
side of the construction is floated with finer concrete or mixture. When I find it
desirable to place the beams at distances apart as in Figure 2. the suspended
concrete blocks are of different section such as H. H. supporting at H¹, H¹ flat
slabs such as J. J. The concrete being filled in between around and over the
girders as before.
I compose my special concrete for use in these constructions of a material known
as Kieselguhr or Diatomite either alone or in combination with Portland or other
cement and with suitable aggregate and I find in practice that the following
proportions are the most suitable the parts or proportions are by measurement not
weight.
No. 1. 4 parts broken hard burned bricks, burnt ballast slag or the like..
11
11
1
clean cinders or clinkers.
Portland or other cement.
"
"
diatomite or kieselguhr.
وو
No. 2. 5 parts broken hard burned bricks burnt ballast, burnt shale slag or the
227
وو
"
1
like.
clean cinders or clinkers.
Portland or other cement.
diatomite or kieselouhr.

page_text: NO. 3. D
parts broken hard burned bricks burnt ballast, burnt shale or the like.
clean cinders or clinkers.
"
"
No. 4. 3
3
2
parts
وو
وو
1
"
Portland or other cement.
diatomite or kieselgubr.
broken hard burned bricks burnt ballast burnt shale or the like.
clean cinders or clinkers.
Portland or other cement.
diatomite or kieselguhr.
This form of construction may also be applied to Mansard and pitched roofing,
partitions and the like but in such erections I prefer to use or T iron in com-
bination with hollow blocks or solid slabs of my special concrete composed as
before described.
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. In fire resisting constructions the use of channel iron beams or girders of
sections such as shown in Figures 1, 2 and 3 of accompanying drawings and
substantially as herein before described.
2. In concrete or plaster for fire resisting constructions the use of so called
diatomite or kieselguhr.
3. In fire resisting constructions the use of concrete or plaster composed
substantially as hereinbefore described and particularly as
numbered 1, 2, 3, 4.
per formulæ
4. The several fire resisting constructions (or any mere equivalents) as and for
the purposes hereinbefore described.
Dated this 16th day of December 1801
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.