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Патент USA US2259374

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Oct. 14, 1941.
Filed oct. 8, 1958
2 sheets-sheet 1
öuapnce Duessmß
F151. 2
Tau. on. O\\_
5TONE_ov. CoNcle-rs
0¢t- 14, 1941. `
ï 2,259,374
Filed Oct. 8, 1958
2 Sheets-Sheet 2
Cmnmce U. GnaMiLsPacHm ‘
Patented Oct. 14, 1,941
' `
>Clarence U. Gramelspacher, Jasper, Ind. Y
Application October 8, 1938, Serial No. `233,992
rc1. »s4-4)
'1 Claim.
This invention Vrelates to the construction of
roads and pavements, and more particularly to
monly observed in bituminous aggregate con
structed -roads and pavements.
Another object is to provide a roadway having
a road or pathway constructed of wood or timber
‘in the form of plies, together with an appropriate
binder and ñller material.
laminated wood slabs positioned beneath the
traveled surface of the highway in order to pro
The invention consists in providing a road or
pavement of b-uilt-up layers comprising a rigid
waterproof base with plywood laid thereon to
form the body of the roadway with a mastic
waterproof surface coating covering the top and
sides of the plywood.
-d-uce an anti-rippling roadway.
the drawings:
Figure 1 'is a perspective view of the construc
tion' of V~the roadway showing the diiferent layers
VFigur-_e -2 is a cross sectional view of the roadway
Wood in the form of blocks has been used here
tofore in the construction of pavements. In this
'orïpavement constructed according to this in--
type of pavement construction, however, wood ,
'blocks are exposed directly to the Wear of trafiic
as well as the surrounding climatic conditions.
The wood block is usually treated with creosote
oil to preserve the wood and prevent the absorp
tion of water which causes swelling. Treated
wood, however, will absorb some water and only i*
by thorough and proper treatment can this be
reduced in amount so as to obviate trouble from
Fig-ure `Bjis an elevation view of the road surface
prior -to applying the surface dressing;
Eig-ure 4 `is -a -View similar to Figure '3, illustrat
:ing `the cutting and laying of the timber em
rFigure 5 is a fragmentary view in section of
the plywood sheet or block employed, showing
the cross grain arrangement of the diiferent
Figure 6 Vis a sectional view of a modified road
Aside from the difficulties encountered by swell
ing, wood block pavements exhibit a high degree
of slipperiness when wet which is very objection
able. Bituminous bonded road surfaces, asphalt
pavements and the like are superior to Wood in
construction similar to that illustrated in -Figure
2, with certain parts broken away.
Referring to the drawings in detail, the nu
meral 1 designates a roadbed which is shaped to
conform to the surface of the finished roadway
this respect but are inferior to wood in the re
or pavement.
Over the roadbed is applied a
sistance offered to wear under heavy traffic con- '
waterproof coating 8 of tar, oil or the like. Any
ditions. Further, due to the pushing force or
pressure exerted against the surface of asphalt
or bituminous pavements, by motor vehicle traf
waterproofing substance may be employed, but
ñc, distinct waves or bumps are produced. Some
times this occurs in recently built pavements.
To overcome this defect various methods have
been devised involving a more careful selection
of materials and more expensive road construc
tion, but the problem has not been entirely solved.
This invention overcomes these defects and pro
vides a highly improved road or pavement con
An object of this invention is to provide an
improved pavement or road construction which
preferably a tar or heavy oil product of coal gas,
water gas or coke oven is used.
Creosote oil or
equivalent heavy oil may be employed either
alone or mixed with tar. A mixture of tar and
creosote oil is somewhat superior as a water
proofing agent to either of these substances alone.
After the application of a waterproof coating
to the roadbed surface, a layer of stone or con
40 crete 9 is applied thereover of desired thickness
and then another waterproofing layer 8 of tar,
oil, or a mixture thereof, is disposed over the
surface of stone or concrete. This seals the con
crete, rock or stone section against the penetra
is inexpensive to build, highly resistant to dis 45 tion of moisture or seepage of water from sur
tortion under traffic, and very durable.
rounding earth. Upon the waterproof layer 8 is
Another object of this invention is to provide
placed a sheet 0r covering Iû of building paper,
an improved roadway or pavement which utilizes
the combination of wood and a suitable surface
libre, plastic or pulp board in order to present
a smooth, regular surface forming a cushion for
dressing to produce a highly improved, inexpen 50 the plywood slabs Il laid thereon. In some in
sive roadway or pavement.
stances the paper or libre board covering may be
Another object is to provide a road wherein
omitted. As an alternative the cushion layer I0
the body of the highway surface comprises ply
may comprise a bituminous mastic of hot tar or
wood. Such a roadway is highly resistant to
asphalt mixed with sand. Sand may be omitted
impact and surface distortion and raveling com 55 and tar alone used as another modificationl
The plywood slabs II, as shown in Figure 5,
comprise alternate cross-grained laminated plies
way or pavement. The space between the outer
edges of the plywood II and the concrete shoul
der I4, as at I5, will be filled with tar or the
surface dressing I3 employed to cover the ply
wood in the construction shown in Figures 1
and 2. In this way the plywood will be thor
oughly sealed from the atmosphere and main
tained waterproof.
of relatively thin sheets of wood IIa held to
gether by glue or resinous material I2 conven
tionally employed for this purpose. For pro
viding greater rigidity the central plies can be
made thicker than the outer sheets. The dimen
sions of the plywood slabs may be varied; in
As a further modification the surface coating
general, however, they are of sufficient width to
extend across substantially one-half the road 10 I3 may comprise concrete or brick. If desired
a combination of concrete and brick sealed with
way surface. Two such slabs are laid with their
tar or equivalent material may be employed as a
ends abutting together at or near the center of
surface dressing for the plywood. In this con
the road as shown in Figures 1 to 4, and
covered with surface dressing. Due to the cross
grained laminated construction of , the ply-,-Y
wood expansion of the slabs is compensated for
and no special joints need be provided. Therply
wood slabs may be laid eitherY Yparallelto> the
> nection, the terms “bonded aggregate” refers to
the Yuse of cement for binding the aggregate as
well as bituminous or other suitable agents.
In the construction of roadways and pave
ments as disclosed by ths invention, comprising
embedded plywood slabs, a resilient highway is
curb, similar to the manner of laying brick, or
diagonally, as illustrated in Figures 3 and 4, re 20 provided which is exceedingly durable and is con
siderably less expensive to build than the con
vention-al hard surface roads.
' Over the layer of plywood is ap'plied a surface
It »is understood, of course, that this inven
dressing I3 of bituminous bonded aggregate.
tion is not limited to the exact details of con
Mineral aggregate employed for this purpose
Amay be crushed stone, slag, gravel, grout, and 25 struction since obvious modiñcations may be
made by persons skilled in the art Within the
the like, the particles smaller than [email protected] inch in
diameter being omitted. Preferably aggregate
scopevof the disclosure and appended claim.
- Having thus fully described by invention, what
I claim asnew and desire to secure by Letters
of hot bitumen or asphalt mixed with coarse 30 Patent is:
An improved roadway or pavement construc
sand may be applied directly over the plywood
tion comprising a roadbed surface having a
ifr desired with or Awithout the use of other ag--_
Waterproof coating thereover, a hard road foun
gregate. This construction makes the pave
having particles ranging in size from 1/2 «to 1%
inchesin diameter is used. A surface dressing
dation surface layer laid thereon, a waterproof
ment thoroughly waterproof and provides for
somel slight expansion of the wood inlaid therein. 35 coating disposed over’said hard foundation sur
face, a cushion layer of sheet material laid over
The wood or'timber plies making up the ply
said waterproof coating, cross-grained plywood
wood are preferably treated with preservative,
such as copper sulphate, zinc chloride, bichloride
of mercury and creosote to prevet the attack of
.wood destroying fungi and insects. ì
In the modification shown in Figure> 6 the
outer margins of the plywood slabs abut against
a concrete shoulder I4 which may be extended
to form the curb and gutter adjacent the road
slabs disposed on said cushion layer, and a
waterproof road surface dressing cover layer ap
40 _pliedoverthe top and side surfaces of said ply
wood, said plywood being thoroughly sealed
against contact with water.
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