U.S. patent number 3,850,539 [Application Number 05/259,513] was granted by the patent office on 1974-11-26 for gap-sealing device.
This patent grant is currently assigned to Watson-Bowman Associates, Inc.. Invention is credited to Thomas C. Bowman, Stewart C. Watson.
United States Patent |
3,850,539 |
Bowman , et al. |
November 26, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
GAP-SEALING DEVICE
Abstract
A gap-sealing device suitable for filling and sealing gaps in
the joints of pavements on bridges, overpasses, ramps, parking
structures, and the like and joints in multilayered structures
comprises a pair of parallel, reinforced, elastomeric anchor
members respectively secured to the facing ends of the adjacent
concrete pavement slabs forming the joint, and a sealing element
removably held at its longitudinal edges in said anchor members and
extending transversely of the pavement in the gaps between said
members.
Inventors: |
Bowman; Thomas C. (Buffalo,
NY), Watson; Stewart C. (Williamsville, NY) |
Assignee: |
Watson-Bowman Associates, Inc.
(Buffalo, NY)
|
Family
ID: |
22985258 |
Appl.
No.: |
05/259,513 |
Filed: |
June 5, 1972 |
Current U.S.
Class: |
404/69 |
Current CPC
Class: |
E01D
19/06 (20130101); E04B 1/681 (20130101); E04B
1/6804 (20130101) |
Current International
Class: |
E01D
19/06 (20060101); E01D 19/00 (20060101); E04B
1/68 (20060101); E01c 011/02 () |
Field of
Search: |
;404/64,65,66,67,68,69,56,74,47 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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|
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410,034 |
|
Oct 1966 |
|
CH |
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475,428 |
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Aug 1969 |
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CH |
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Primary Examiner: Byers, Jr.; Nile C.
Attorney, Agent or Firm: Harlan, Jr.; Ashan F.
Claims
We claim:
1. A gap-sealing device particularly suitable for bridges,
over-passes, ramps, and the like which comprises: a pair of
longitudinally extending, laterally spaced anchor members provided
with longitudinally spaced means for fastening them to supports,
each of said members being substantially rectangular in
cross-section, formed of relatively hard elastomeric material, and
provided with a longitudinal passage therethrough, said members
having in their facing edges channels extending longitudinally of
said members, each of said channels comprising a narrow opening and
an enlarged inner portion and having a slit in the wall of said
enlarged inner portion thereof whereby to form a hinged lip at the
lower edge of said anchor member adjacent said channel; a
reinforcing plate extending through said passage and having
substantially the same cross-section as said passage; and an
elongated, flexible, impermeable web of elastomeric material
extending longitudinally between and joining said anchor members,
said web having enlarged side edge portions removably engaged
directly in said channels; and said web being clamped in said
channels.
2. A gap-sealing device as defined in claim 1 in which said anchor
members are of neoprene and said web is of low crystallization
neoprene.
3. A gap-sealing device as defined in claim 1 in which said web is
in part V-shaped in cross-section.
4. A gap-sealing device as defined in claim 1 in which said web
includes a plurality of integral V-shaped sections.
5. A gap-sealing device as defined in claim 1 in which said anchor
members are serrated on at least one surface thereof.
6. A gap-sealing device as defined in claim 5 in which said anchor
members are serrated on both the top and bottom.
7. A gap-sealing device as defined in claim 1 in which the enlarged
edge portions of said web are hollow.
8. A gap-sealing device as defined in claim 1 in which the enlarged
edge portions of said web are sagittal in cross-section.
9. A gap-sealing device as defined in claim 1 in which the enlarged
edge portions of said web are curved in cross-section.
10. A gap-sealing device as defined in claim 1 in which the
enlarged edge portions of said web are rectangular in
cross-section.
11. A gap-sealing device as defined in claim 1 in which said
longitudinal passages lie below the horizontal center lines of the
anchor members.
12. A gap-sealing device as defined in claim 11 in which said
reinforcing plates are of metal.
13. A gap-sealing device as defined in claim 1 in which said anchor
members are provided with bores extending longitudinally thereof
for reception of aligning means.
14. A gap-sealing device as defined in claim 1 in which the lower
facing edges of said anchor members are thickened.
15. A gap-sealing device as defined in claim 14 in which said
anchor members are of neoprene, are serrated on at least one
surface thereof, and are provided with longitudinally extending
bores for reception of aligning means; in which said web is of low
crystallization neoprene and is in part V-shaped in cross-section;
and in which the enlarged edge portions of said web are sagittal in
cross-section.
16. A gap-sealing device as defined in claim 1 in which said anchor
members are of neoprene, are serrated on at least one surface
thereof, and are provided with longitudinally extending bores for
reception of aligning means; in which said web is of low
crystallization neoprene and is in part V-shaped in cross-section;
and in which the enlarged edge portions of said web are sagittal in
cross-section.
Description
BACKGROUND OF THE INVENTION
This invention is concerned with gap-saling devices and relates in
particular to such devices as are employed in filling and sealing
gaps in the joints of pavements on bridges, overpasses, ramps, and
the like.
Gaps in the joints of the pavements on bridges and the like are
provided to permit relative movement of the structural sections on
either side. Such relative movement may occur as a result of
expansion and contraction, usually caused by changes in
temperature, and also as a result of deflections in the structure
and shifting of bearings and/or foundations. Although in some
installations these gaps are left open or partially closed by
relatively moving elements, it is often desirable to seal them to
prevent entrance of dirt and other debris and to prevent passage of
water therethrough. The means employed for sealing the gaps must
provide sealing during widely varying weather conditions and during
considerable relative movement of the abutting structural sections,
while being essentially unaffected by traffic over the gap and not
interfering with such traffic. With many of the devices provided in
the prior art for use in sealing pavement joints the sealing means
is subjected to excessive stresses and/or wear resulting in
failure, and/or the devices are difficult to install or to
repair.
SUMMARY OF THE INVENTION
By the present invention there is provided a gap-sealing device
suitable for filling and sealing gaps in the joints of pavements on
bridges, overpasses, ramps and the like which solves problems
encountered with prior devices designed for this purpose. The novel
device of the present invention is readily and quickly installed
and, if necessary, can be readily repaired. Moreover, it is very
durable because it is quite wear-resistant and is subjected to only
very small working stresses. It completely eliminates the
transmission of deleterious stresses to the structure. It comprises
a pair of parallel, reinforced anchor members which are
respectively secured in recesses in the facing ends of the adjacent
concrete pavement slabs; said members having extending between
them, tranversely of the pavement, in the gap between the members,
a sealing element. The latter comprises a flexible web removably
but firmly held along its longitudinal edges in the anchor members
in a manner to seal the gap against entrance of water and other
material even during relative movement of the pavement slabs to
which the anchor members are attached.
SHORT DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary plan view of the sealing device of the
invention installed in a bridge pavement;
FIG. 2 is an enlarged, fragmentary, sectional view on line 2--2 of
FIG. 1;
FIG. 3 is a partially exploded sectional view on line 3--3 of FIG.
2 showing a joint between two lengths of the sealing device;
FIG. 4 is a further enlarged, fragmentary, sectional view
illustrating a modified form of flexible sealing element or
web;
FIG. 5 is an enlarged, fragmentary, sectional view, similar to FIG.
4, omitting the sealing element and illustrating the configuration
of the anchor members for the sealing element before insertion of
the flexible sealing element;
FIG. 6 is an enlarged, fragmentary, sectional view illustrating a
possible modification of the anchor members used in the present
invention; and
FIGS. 7 - 11, inclusive, are enlarged, fragmentary, sectional
views, similar to FIG. 4, illustrating other modified forms of
sealing elements or webs and means for securing them in place.
DESCRIPTION OF A PREFERRED EMBODIMENT
In the joint shown in FIGS. 1 and 2 the numerals 11 refer to
adjacent and confronting concrete slabs in a bridge pavement, the
slabs being separated at their abutting ends by an opening or gap
12. At the end of each of the slabs 11 there is provided a
tranversely extending, shelf-like, recessed portion 13 in which
there is received an elongated anchor member 15. The anchor members
15 on the adjacent slabs are spaced apart, the outer edge faces 16
thereof preferably extending only to the edges of the respective
slabs 11, and are joined in fluid-tight relation by an intervening
flexible web member 17 in a manner hereinafter described.
The terms "upper," "lower," "top," "bottom," "right," "left,"
"above," "below," "longitudinal," "lateral" and similar terms
describing position and/or direction as used hereinafter refer to
the illustrations in FIGS. 1 - 4, but only for convenience in
description or reference. Such terms should not be so construed as
to imply a necessary positioning of the structure or portions
thereof or to limit the scope of the invention described
herein.
The elongated anchor members 15 are, as shown, substantially
rectangular in cross-section and preferably of greater width than
height. The top 19 and bottom 21 of each of the members 15 are
preferably serrated. Extending longitudinally through each of the
members 15, preferably between a horizontal plane passing through
the middle of the member and the bottom 21 thereof, is a relatively
thin, laterally elongated passage 23. Each of the members 15 is
also provided with a pair of longitudinally extending bores 25,
these being conveniently located, respectively, adjacent the upper
corners of the member. The bores 15 are preferably parallel with
each other and with the sides and top of the anchor members.
In the abutting edge faces 16 of the members 15 there are provided
matching, longitudinally extending channels 27, the inner portions
of which are sagittal in cross-section, which are adapted to
removably receive and hold the similarly shaped edges 29 of the
generally V-shaped flexible web member 17. When installed, as shown
in FIG. 2, the openings to channels 27 are narrow and the edges
thereof fit tightly against the web members at the bases of the
enlarged web edges 29 to ensure sealing between the anchor members
and the web member and to hold the web members securely in
place.
FIG. 2 illustrates in detail the way in which a novel gap-sealing
device according to the present invention is mounted on and between
abutting pavement slabs 11. After insertion of the enlarged edges
of the sealing member 17 in the facing channels 27, the anchor
members 15 are secured in the recessed portions 13 of the concrete
slabs with a suitable adhesive bedding compound applied between
both the serrated bottoms 21 and the concealed side faces of the
members and the contiguous areas of the recessed portions. At
spaced intervals along the length of each of the members 15,
vertical holes 31 are provided through the member, such holes
extending downwardly to an elongated metal reinforcing plate 33
that has substantially the same cross-section as the passage 23 and
extends through the passage. Smaller holes 35 and 36, preferably
concentric with the holes 31, are provided, respectively, through
the plate 33 and the portion of the member 15 below the plate, to
receive threaded studs 37. The studs are fixed in the slab 11 at
their lower ends by suitable means and extend upwardly through the
holes 35 and 36 into the larger holes 31. By the use of nuts 39 and
washers 41, the members 15 can be rigidly but removably anchored to
the slab 11. After the nuts 39 are tightened, the holes 31 may be
filled with a suitable filler 43, for example an epoxy-modified
rubber, a polyurethane resin, or a neoprene or other elastomer
composition. Alternatively, caps of rubber or other elastomer may
be used over the nuts 39.
The anchor members 15 can be made of any plastic or elastomeric
material but are preferably formed of neoprene of at least 70 - 75
durometer hardness to impart high resistance to abrasion and wear.
They may be molded but are preferably extruded, in relatively long
lengths, with the passages 23, bores 25, and channels 27 formed in
the extrusion process. In many cases, the extruded lengths of the
members 15 may be long enough to extend the entire width of the
pavement.
Where use of a single length of anchor member is not feasible, a
joint such as indicated at A in FIG. 1 may be used. FIG. 3
illustrates the way such a joint may be formed. Metal dowels 45 are
inserted in the facing end of the bores 25 of the abutting members
15 to hold the latter in alignment and facilitate insertion of the
reinforcing metal plate 33 into the passages 23 thereby to bridge
the joint. Thus, the joint between the ends of abutting members 15
is firm and secure. If desired, a suitable adhesive may be applied
between the contacting ends of the abutting members 15 to seal the
joint. Alternatively, the abutting ends may be provided with tongue
and groove or mortised joints or be placed in compression. If
desired, the bores 25 need not be provided throughout the entire
length of each member 15. Instead, shorter bores may be drilled or
molded in the ends of sections of the members to receive aligning
dowels in forming end joints.
The flexible sealing web 17, some times referred to as a rolling
gland, is also preferably extruded in relatively long lengths.
Other flexible elastomeric or resinous materials, such as natural
and synthetic rubber, silicones, polytetrafluoroethylene and
ethylene-propylene terpolymers can be used but a
low-crystallization neoprene is most satisfactory in many cases. In
some cases still other materials may be employed, even thin,
flexible metal being satisfactory in some installations of certain
types. The thickness and stiffness of the webs 17 may be varied as
desired to make the webs suitable for a particular installation.
Generally, the width of the web when stretched laterally is at
least twice the width of the gap 12 in the pavement joint. Wider
webs can be used and, in some cases, narrower ones. However, in
installations where the joint is to carry traffic it is important
that the width of the sealing element or web be such that, even
when the gap 12 between the abutting pavement slabs is at a
minimum, for example because of thermal expansion of the slabs, the
web will not protrude from the gap.
As pointed out above, the top and bottom surfaces of the anchor
membors 15 are preferably provided with serrations. The serrations
on the top provide a good gripping surface for the tires of
vehicles and thus tend to minimize slipping or skidding. The
serrations on the bottom serve to distribute and hold the adhesive
bedding compound employed to secure and seal the anchor members 15
in place in the recesses 13 of the slabs 11. Although in the
accompanying drawings the protruding serrations are shown evenly
spaced and with flat outer ends, it will be understood that, if
desired, they may take other forms and be differently spaced.
Compositions suitable for securing the anchor members in the
recesses and, when necessary, for splicing lengths of the anchor
members are well known.
In assemblying the sealing device illustrated in FIGS. 1 - 3, the
anchor members 15 of the pair required for the installation are
laid down in parallel relation with the channels 17 therein facing.
As shown best in FIG. 5, a longitudinal slit 47 is formed in the
lower portion of each channel 27 so that there are lips or flaps 49
provided along the lower edges of the edge faces 16 of the members
15. Thus, the sagittal edges 29 of the web or gland 17 may be
easily inserted in the facing channels by bending back the lips 29.
When, however, the anchor members 15 are bolted in place in the
recessed portions 13 of the pavement slabs, the lips 49 are forced
against the web at the bases of the enlarged edges locking them in
the channels and thus firmly securing the web. As will be seen in
FIGS. 7 to 9, the angle of the slit is not critical.
A modified construction for locking the gland in place is shown in
FIG. 6. In this modification a firm gripping of the edges of the
web or sealing member is achieved by providing the channeled face
of each of the members 15' with a thickened lower edge which
diminishes in thickness inwardly from the face 16' to form a
beveled portion 51. When the anchor members are bolted in place as
in FIG. 2, the bottoms thereof are flattened and the edges of the
web are clamped and sealed firmly even when the openings of the
channels 27' are somewhat oversize to permit easy assembly. The
angle of the beveled portions 51 and the extra thickness of the
edges of the members 15' may vary as required to obtain the desired
amount of compression on the edges of the sealing members used
therewith. If desired, the channels 7' may also be provided with a
slit 47' like the slit 47 in FIG. 5 although this is not
necessary.
In FIG. 4 the structure is the same as above-described except that
the V-shaped web 17 is replaced by a web 17' that is of greater
width than the web 17 and presents in cross-section a multiple
V-formation. The web 17' is also provided with side edges 29' that
are sagittal in cross-section and fit closely in the channels 27 of
the members 15. The greater width of the web 17' permits use of
this modified gap-sealing device in joints having wider pavement
gaps and permits a greater relative movement between the ends of
the abutting pavement slabs without, however, substantially
increased stress in the web. In this modified form of the
invention, as well as in the form shown in FIG. 2, it will be seen
that the flexible web members provide good sealing with the
cooperating anchor members because the edges of the longitudinal
channels 27 fit closely against the web member secured therein. The
web 17' like the web 17, may vary as desired in width, thickness,
and stiffness. As with the web 17, however, it is important in the
installations where the joint is to carry traffic that the web 17'
does not protrude from between the anchor members when the gap 12
is at a minimum.
Obviously, still other suitable web configurations can be used
without departing from the spirit of the present invention. Some of
the possible configurations of the flexible web sealing members are
illustrated in FIGS. 7 - 11. In the first three of these figures
the anchor members are constructed identically except for the shape
of the inner portions of the channels in the edge faces 16. In FIG.
7 the side edges 59 of the web 57 and the inner portions of the
channels 61 are semi-circular in cross-section. In FIG. 8 the web
or gland side edges 59a and the inner portions of the channels 61a
are rounded and somewhat oval in cross-section; and in FIG. 9 the
respective edges 59b and channel portion 61b are rectangular in
cross-section. FIGS. 10 and 11 illustrate another type of web or
sealing member in which the side edges 69 and 79, respectively, of
the sealing members or glands 67 and 77 are, like corresponding
webs 17' and 17, also sagittal in cross-section but asymmetric with
respect to the main portions of the webs. In the latter figures the
channels 80 in the anchor members 65 are shaped to fit the web
edges 69 and 79 and the inner portions thereof are directed
downwardly at an angle to the horizontal. FIGS. 10 and 11 also
illustrate certain other possible modifications, specifically the
omission of the slits communicating with the channels and making
the side edges of a sealing web hollow instead of solid. These
constructions are in some cases desirable.
Assembly of the modified forms of sealing members and anchor
members shown in FIGS. 4 - 9 may be carried out in a manner similar
to that described in connection with the forms shown in FIGS. 1 -
3. However, when the slits opening from inner portions of the edge
channels are omitted, as illustrated in FIGS. 10 and 11, a
different assembly procedure is preferred since the enlarged edges
of the sealing member do not readily pass through the openings of
the channels. The webs may be easily inserted by sliding the
enlarged edge portions into the channels lengthwise. This is
facilitated by the use of a lubricating adhesive composition
applied to the web edges and/or the channels. The use of such an
adhesive, a number of which are commercially available, is in many
cases desirable as it not only holds the sealing members in place
but also seals the joints between such members and the associated
anchor members.
It will be understood that the invention is not to be considered as
limited to the particular designs of webs or sealing members and of
anchor members illustrated and described herein. Other equivalent
designs will be apparent to those skilled in the art. Further, the
types of webs and anchor members shown together are not critical.
Thus, for example, any of the web edge configurations can be used,
if desired, with anchor members in which no slits are provided in
the channels of the anchor members, and web edge configurations
like those shown in FIGS. 10 and 11 can be used with anchor members
formed with slits in the inner portions of the edge channels and/or
a thickened edge as shown in FIG. 6. It is desirable, however, to
have the enlarged edges of the webs fit rather closely in the
channels with which they are used. In this connection it may be
noted that, while not necessary, suitable adhesive can be used to
hold the sealing members in the channels and seal the formed joints
even when the channel forms illustrated in FIGS. 4 - 6 are
used.
Although as illustrated the gap-sealing device of the invention is
installed with the top surfaces of the anchor members flush with
the upper surfaces of the concrete pavement slabs, it will be
recognized that such members may be of greater thickness so as to
extend above the concrete surface, thereby achieving a smooth joint
when an asphalt topping layer is used. In such case, the mmebers
provide curbs for the asphalt at the joints. In fact, there is
nothing critical in the dimensions of the anchor members and they
may be changed in size and shape as desired or convenient. Further,
it will be evident, there is nothing critical in the spacing of the
holes provided in the anchor members for bolting them down. Such
holes are preferably cut or bored in the members after extrusion
thereof and can be located with any desired intervals between them.
In fact, bolting may even be provided for at the abutting ends of
sections of the anchor members (such as shown at A in FIG. 1) by
cutting matching hemicircular notches (not shown) in the members at
such ends. Although the matching holes 35 in the reinforcing plates
33 may be drilled after the plates are installed in the anchor
members, it is preferred to punch or drill such holes prior to such
installation.
Installation of the present novel gap-sealing devices is simple and
inexpensive. This is due not only to the novel construction, but
also to the fact that in many cases a continuous length of the
device can be used and the need of splicing is thus eliminated.
When splicing of the anchor members is required, mitered joints may
be used instead of butt joints, if desired. In many cases, sealing
of the contiguous ends of the anchor members is unnecessary but, as
explained above, they can be sealed by adhesive, if desired.
Expensive is reduced and installation facilitated by having the
anchor members alike so that no distinct right-hand and left-hand
elements are necessary. Consequently, when in position the two
facing anchor members are mirror images of each other. Assembly of
the anchor members and webs or sealing members to form the joint
seals of the present invention can be carried out either before
delivery to the point of installation or at such point. In the
latter case it will generally be more convenient to employ anchor
members having a slit in the inner portion of the edge channels
since the flap thus formed makes it possible to insert the enlarged
edges of the sealing members in the channels without special
holding equipment.
From the foregoing description it will be apparent that the
gap-sealing devices of the present invention are highly efficient.
Not only is no substantial force applied to the anchor members in
use, but the intervening web or sealing member is subjected to
extremely low working stresses and, particularly, to substantially
no tensile stress. Because of the relative thinness of the web
members, devices according to the invention are suitable for use
where severe skew movement may take place since such movement
merely causes a wrinkling of the web. They are also particularly
useful in installations where one of the abutting pavement sections
is at a vertical angle with respect to the other since, because of
its shape and flexibility, the web member adjusts for such
angle.
The novel structure of the invention makes possible easy
installation even when the gap between adjacent pavement slabs
varies in size during the course of installation. Installation of
joint-sealing devices of other types under such a condition is very
difficult, if not impossible. In fact, in some installations long
waiting periods may be required to obtain the necessary conditions.
In the devices of the present invention, the low stress required to
stretch or compress the flexible web or sealing members and the
rigidity of the anchor members, even at end joints therein, because
of the reinforcing metal plates and the longitudinal dowels at such
joints, make it possible to continue installation during expansion
or contraction of the pavement slabs.
As explained above, it is preferred to hold the anchor members in
place by both the use of adhesive and bolting through the
longitudinally extending, reinforcing metal plates. Consequently,
buckling cannot occur and, in use, the installation will be
substantially noiseless as the reinforcing metal members and
securing nuts are situated within the anchor members where they are
not contacted by vehicles or other parts of the roadway.
In addition to having the advantages of being substantially
noiseless and non-buckling, the gap-sealing devices of the present
invention are resistant to wear. In this connection, it sbould be
noted that the design is such that for traffic use the flexible web
members do not protrude above the anchor members and hence are not
subjected to wear. The sealing of the joint gaps is excellent
since, because of the adhesive bedding compound used in securing
the anchor members in the recesses 13, there is no leakage around
them and the snug fit and/or adhesive sealing of the web members,
which are themselves impermeable, in the channels of the anchor
members precludes passage of water into the gap around the
webs.
It will be understood that the scope of the present invention is
not limited to the specific construction described and illustrated
in this application since numerous modifications can be made
therein without departing from the spirit of the invention.
Consequently, the invention should be construed as broadly as
permitted by the appended claims. It will also be understood that
the novel sealing device of the present invention is capable of
wide use and is not limited to use in roadways and the like.
* * * * *