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Патент USA US2118330

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2,118,330
Patented' May 24, 1938
UNITED STATES PATENT OFFICE
2,118,350
GltA'l‘IlilG’r- EXPANSION JOINT FOB BRIDGES
Ernest L. Tarot, Brooklyn, N. Y., assigner to Ker
low Steel Flooring Co., Jersey City, N. J., a cor
poration of New Jersey
Application February 17, 1937, Serial No. 126,102
10 Claims. (Cl. 14-16)
This invention relates to grating expansion gether for expansion or contractile movement
joints for bridges and the like and has for its
object to eliminate disadvantages inherent in
many of the previously used types of such joints.
5 Another object is to provide such an expansion
joint which is especially adapted for use with the
type of metal gratings which we manufacture.
One common form of expansion joint on the
highway portion of bridges has been a butt type
joint which is practically vclosed in hot summer
weather but wide open in cold weather. In many
places the distance or sizeof gap which is open
in such types of expansion joint in cold weather
may be as much as about three inches, which is
too large a 'gap for trame to pass over smoothly,
with the result that heavy trucks cause substan
tial impacts which needlessly impair the joint.
Another type of expansion joint in use has in
„ volved oppositely extending tapered fingers which
overlap longitudinally various amounts accord
ing to the temperature or season.
An objec
tion to this type of expansion joint is that ice
forms on `the vsides of the overlapping lingers
due to their being laterally spaced only a small
amount,
perhaps about a quarter of an inch.
25
This formation of ice is sufliciently serious to
impede the functioning of the expansion joint
3
35
and it has been necessary tohave workmen with
blow torches go around and melt the ice thus
formed. Under this invention the tendency of
ice to form at the expansion joint isjsubstan
tìally minimized.
Referring to the drawing, Fig. 1 is a top plan
view of one embodiment of this invention.
Fig. 2 is a section on the line 2-2 of Fig. l.
Fig. 3 is a section on the same line of Fig. l,
but with the grating sections Widely spaced, as
in very cold weather.
'
Fig. 4 illustrates a modiñed type of expansion
40
joint.
,
Fig. 5 shows a further type of expansion joint
adapted for use with grating sections.
Fig. 6 is a lift or bascule type bridge for which
the expansion joint of Fig. 5 is particularly
45 adapted when used with my open grating door.
A grating section I0 on a bridge or the like
is movable with respect to the end of an adja
cent grating section II, so that these adjacent
end portions are quite close together in very hot
50 weather but contract and form a space, I2, be
tween them which may vary up to possibly three
inches in the very coldest weather. Each grat
ing section, I0 and II, may be of any convenient
length and may include several or> any desired
55 number of such lengths which are fastened to
as a unit. Preferably each such section is an
chored to one of its transverse supporting beams
adjacent its central portion in order that the ex-pansive movement of each section may be on
both sides of such anchorage. Ordinary beams
I3 and Il, extend transversely across the bridge
for supporting these grating sections we manu- n
facture. Each grating section is preferably com
prised of straight bars, I5, and spacing bars, I6, 10
which are riveted or welded to the straight bars.
Any convenient type of spacing bar may be used
such as that illustrated or the substantially nor
mal type bar. vA splicing section, I1, is provided
to support the adjacent end portions of the grat 15
ings, Ill and II, and also for the purpose of pro
viding a ñller or bridge when the gap, I2, is large,
in order that vehicular trailic may -travel over
the open gap with ‘a minimum amount of vibra
tion. ‘ This splicing section includes a number 20
of longitudinal members arranged contiguous
alternate longitudinal members of the grating
sections, or, if desired, they may be arranged
contiguous each longitudinal member of the grat
ing sections I0 and II. As illustrated in Fig. 1,
this splicing section has its longitudinal por
tions arranged contiguous alternate longitudinal
grating members and connected tothe longitudi
nal straight bars by headed securing means, I8,
passing through elongated slots, I9, located be 30
low the spacing bars in order that limited rela
tive movement may take place between the splic
ing section and each grating section.
The longitudinal portions of the splicing sec
tion Il are preferably supported on the trans 35
verse beams, I3 and I4, as illustrated and so
shaped as to ñt between these beams and con
tiguous their sides so that the splicing section
longitudinal portions are substantially fixed
while the adjacent ends of the grating sections, 40
I0 and I I, are movable with respect thereto with
temperature change. ` 'I'he longitudinal portions
of the splicing section may be connected by spac
ing portions below the longitudinal straight bars
of the grating sections, I0 and Il, as suggested
in my Patent 2,014,912, dated September I7-, 1935.
0r, if desired, the various longitudinal bars of
45
the splicing section I1 may be disconnected ex
cept as they are connected through the grating
sections. The top of the splicing sections prefer 50
ably is contiguous the under side of the spacing
bar, I B, to assist in supporting the overhang
ing ends of the grating sections. In the em
bodiment illustrated, the headed securing means,
I8, which may be either a bolt or a rivet, is ?xed 55
2
2,118,830
with respect to the portion of the straight bars,
l5, through which it passes beneath the spacing
bar, I6, while the slots, i9, are shown as being
provided in the splicing section.
The central portion of the splicing section is
raised as shown at 2|, to a height substantially
ilush with the top of the grating sections, i0
be understood that if desired this splicing section
may be fastened with respect to either’grating
section and movable with respect to the other.
The splicing section of this invention may serve
the combined oillce of both a splicing section to
support the ends of adjacent gratings and also
as a bridging part oi’ an expansion joint. There
is little or no tendency for ice to form between
and Il, so that when the grating sections are
widely spaced apart, this raised portion, 2 I, serves
longitudinal portions of the expansion joint,`
either in Fig. 5 or in Figs. 1 to 4. It the adjacent 10
ends of the grating sections are oi' the type illus
trated in Fig. 5, these sections may have their
as a bridging element to facilitate smooth travel
of vehicular trañic over the joint in cold weather
without objectionable impact. As shown in Fig.
1, this raised or bridging portion. 2i, lies con
tiguous alternate straight bars, I5. If it is de«
straight bars in substantial alignment when the
raised portion of a splicing section may be placed
contiguous each straight bar, or it desired, a.
15 sired for the splicing section longitudinal mem
bers to be contiguous each of the longitudinal
splicing section between adjacent straight bars
straight bars, l5,l thenvthe raised portion, 2|, in
as in Fig. 4 may be used with the grating ends
of the type shown in Fig. 5. In event an un
alternate straight bars must be considerably
shorter than that shown» in Figs. 1 to 3, or else
20 the bent spacing bar, I6, will have to be termi
nated at alternate straight bars, I5, back from
the ends of alternate straight bars of each sec
tion rather than allowed to extend to the ends
of alternate straight bars as illustrated in Fig. 1.
In Fig. 4, the'long'itudinal portions, I'la, of the
splicing section are arranged between rather
than on the same side of the straight bars, lia,
usually hot day may expand the grating sections
shown `in Fig. 5 until the ends of the bars, 23, 20
abut the spacing bars, lib, that should not be
objectionablev for it shouldbe a relatively simple
matter for either the ends, 23, or the bent bars,
I6b, to be bent by expansion and contract as
may be necessary.
From Fig. 5, it may be seen
that if the ilngers, 23, have their ends abutting
the bent bar, llîb, the .tendency of any of the bars
of each grating section. .This arrangement has to be bent is balanced due to the symmetrical
the advantage of enabling the longitudinal ~ arrangement of the spacing bars, lib.
straight bars of. each grating section to overlap
I claim:
each other longitudinally, if desired. In each
1. A grating expansion joint between sections
embodiment the bent bars must be shaped to for a bridge and over which vehicular trañlc is
allow the necessary relative movement between adapted to pass, comprising longitudinal mem
the splicing section straight bars and the grating bers adapted to move toward and from each other
35 sections. Here again the longitudinal portion of as portions of. said bridge expand and contract,
- the splicing sections may be laterally connected a longitudinal member overlapping portions of
or not, as desired, below the straight bars of the said first mentioned longitudinal members, hav
grating sections.
ing an extension substantially ñush with the top
In Fig. 5 is shown another form of expansion of said sections, adapted to -bridge any gap
40 joint adapted for use with grating sections.
between them and to assist in directly support
This type of joint will be seen to comprise over
lapping straight bar extensions, 23, which are
formed beyond the termination of the bent bars,
I6b, and the straight bars, l5b, are shown as
45
being laterally spaced about midway between
pairs of the straight bars of the other grating
section. An expansion joint of this type is
preferably used without the splicing section de
scribed in connection with Figs. 1 to 4, inclusive.
50 Since the spacing between straight bars oi'. a
Y55
grating section is generally inV excess of two
inches, the lateral spacing between the over
lapping ñngers, 23. is generally in excess of an
inch, with the result that any tendency for ice
to form on the sides of the overlapping bars, 23,
is greatly minimized. The expansion joint shown
in Fig. 5 is especially adapted for- use with lift or
bascule type bridges the adjacent end portions oi
which may be slightly overlapped. ,Such a bridge
60 is illustrated in outline in Fig. 6, where the bas’
cules 2li are pivoted at 25, as is customary.
Among the advantages of this invention may
be mentioned the elimination of any exposed sur
faces adjacent the expansion joint on which sub
65 stantial quantities of snow or ice may collect.
The relatively narrow edge surfaces provided in
gratings allow for very little snow or ice to col
lect. The provision of a raised or bridging part
to the splicing section permits vehicular traffic
70 to travel over a wide gap in cold weather with
little or no impact comparable to what might
occur if the raised or bridging portions were ab
sent. While the splicing section has been illus
trated as being anchored and movable with re
75 spect to each grating section, nevertheless, it will
ing vehicular trafllc as it. passœ over such gap,
said second mentioned longitudinal member be
ing slidably secured to the ñrst mentioned longi
tudinal members so that it need not move with
them.
.,
2. A grating expansion joint between sections
for a bridge and over which vehicularv trame is
adapted topassI comprising longitudinal mem
bers adapted to move toward and from each other
as portions of said bridge expand and contract, a
longitudinal member overlapping portions of said 50
first mentioned longitudinal members, having an
extension substantially flush with the top of said
sections, adapted to bridge any gap between them
and to assist in directly supporting vehicular
trailìc- as it passes over such gap, said second 55
mentioned longitudinal member being slidably
secured to at least one of the iirst mentioned
longitudinal members so that it need not move
with them, and means for holding said second 60
mentioned longitudinal member against move
ment with at least one of said ñrst mentioned
longitudinal members.
’
3. In a bridge or the like paved with metal
grating sections adapted to be moved toward and 65
from each other longitudinally with expansion
and contraction of said sections, each section in
cluding longitudinal substantially straight bars
having 'spacing bars secured between them and
of less depth than the straight bars, a splicing 70
section having longitudinal members secured to
at least some of. the longitudinal members of said
sections by headed securing means fastened to
the longitudinal Amember of one section and pass
ing through a longitudinal elongated slot in the ß
v
2,118,380
contiguous longitudinal member, said spliced sec-~
tion having an elevated portion centrally thereof
rising to a height such that its top is substantially
flush with the tops of said grating sections.
4. In a bridge or the like paved with metal
grating sections adapted to be moved toward and
from each other longitudinally with expansion
and contraction of said sections, each section in
cluding longitudinal substantially straight bars
10 having spacingV bars secured between them and
of less depth than the straight bars, the straight
bars of one section being laterally displaced from
the straight bars in the other grating section, an
expansion joint being formed between said sec15 tions so that a longitudinally extending portion
of one section substantially overlaps another lon
gitudinally extending portion of theother sec
tion to prevent the formation of an open gap lon
gitudinally between the sections at the top or
20
tread surface of said paving, said joint including
a splice section secured to the longitudinal
straight bars of each section below their spacing
bars and having an extension substantially flush
with the top of said sections at their ends.
25
5. In a bridge or the like, an expansion joint
formed between metal grating sections which are
adapted to be moved toward and from each other
30
longitudinally with expansion and contraction of
said sections, each section including longitudinal
substantially straight bars having spacing bars
secured between them and of less depth than the
straight bars, spaced transverse beams on which
said sections are supported, a splicing section
overlapping the adjacent end portions of said sec
35 tions in said joint, and being supported at its
ends on adjacent portions of said sections, a slid
able connection between said splicing section and
the adjacent end portions of said grating sections,
said splicing section being anchored to at least
40 one of said transverse beams.
6. In a bridge or the like, an expansion joint
formed between metal grating sections, which are
adapted to be moved toward and from each other
longitudinally with expansion and contraction of
said sections, each section including longitudinal
substantially straight bars having spacing bars
secured between them, spaced transverse beams
3
gitudinal bars in said grating sections. the longi
tudinal bars of the splicing section having an ex
tension which is substantially flush with the tops
of said grating sections.
7. An expansion joint between metal grating
sections comprising a splicing portion attached
to at least one of said grating sections, having a
part which is substantially flush with the tops of
said gratingsections and which is adapted to
longitudinally overlap the ends of said grating 10
sections.
8. The combination with a pair of metalgrat
ing sections adapted to have a space between
their adjacent ends, of longitudinal members
overlapping said sections, forming anexpansion»
joint and provided with raised portions substan
tially ilush with the tops of said grating sections
at their ends, and supports for said grating sec
tions and longitudinal members.
9. A grating expansion joint for a bridge and 20
over which vehicular trailic is adapted to pass,
comprising longitudinal members adapted to
move toward and from each other as portions of
said bridge expand and contract, a longitudinal
member overlapping portionsl of said iirst men
any gap between them and to assist in directly
supporting vehicular tramo as it passes over such
gap, said second mentioned longitudinal mem
ber being slidable relatively to at least one oi' the 30
iirst mentioned longitudinal members, said sec
ond mentioned longitudinal member having its
end portions provided with supporting means
which is in addition to any connection to either
35
of the ilrst mentioned longitudinal members.
l0. A grating expansion joint for a bridge over
which vehicular trafilc is adapted to pass, com
prising grating sections which are adapted to be
moved relatively toward and from each other
longitudinally with expansion and contraction oi’ 40
said sections, each section including longitudinal
substantially straight bars having bent spacing
bars secured between them and of less depth
than the straight bars, splicing bars secured to
at least some of the straight bars of said sections 45
below the spacing bars and provided with raised
portions substantially ñush with the tops of said
on which sections are supported, a splicing sec-v sections and bridging any gap between the ends
tion overlapping the adjacent end portions of of no more than alternate ones of said straight
50
said sections and including longitudinal bars
slidably secured to longitudinal bars of each grat
ing section, said splicing section being located
contiguous and on opposite sides of adjacent lon
25
tioned longitudinal members, adapted to bridge
bars when the spacing bars extend substantially 50
to the adjacent ends of said grating sections.
ERNEST L. TAROF.
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