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Патент USA US2109025

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Feh. 22, 1938.
R. IRVlN
CRIBBING STRUCTURE
Filed Dec. '7, 1936
' 2,109,025
2,109,025
Patented Feb. 22, 1938
UNITED STATES
PATENT OFFICE A
2,109,025
CRIBBING STRUCTURE
Richard Irvin, Pittsburgh, Pa.
Application December '7, 1936, Serial No. 114,661
4 Claims. (Cl. 61-47)
This invention relates to a cribbing structure
of the type embodying a frame work of assem
bled beams to be ?lled with earth, stone, rubble
or the like, for supporting and retaining em
5 bankments of cuts, ?lls and excavations, and for
foundation walls, retaining walls, or analogous
work wherever applicable, of either a permanent
or temporary nature.
1 Important objects and advantages of the in
lU vention are to provide a cribbing structure of
the character described, which employs precast
cribbing members constructed of concretive com~
position material rendering same most durable
and particularly adapated for use in cribbing
1-5 structures of a permanent nature, which em
bodies novel means for maintaining the associ
ated cribbing members in their relative positions,
and which is not affected by any untoward
weather conditions.
20
Further objects of the invention are to pro
vide a construction of the class stated, which is
simple in its construction and arrangement,
which may be readily erected or removed, which
combines minimum Weight and maximum
25 strength, and which is comparatively economical
in its manufacture, erection and maintenance.
With the foregoing and other objects in view
which will appear as the description proceeds,
the invention consists of the novel construction,
30 combination and arrangement of parts herein
speci?cally described and illustrated in the ac
companying drawing, but it is to be understood
that changes in the form, proportions and de
tails of construction may be resorted to that come
35 Within the scope of the claims hereunto appended.
In the drawing wherein like numerals of ref
erence designate corresponding parts through
out the several views:
Figure l is a front view, partly in cross section,
40 of a cribbing structure constructed in accord
ance with the invention.
Figure 2 is a longitudinal cross sectional view
of a header beam. illustrating its connection
with the stringer beams by the key blocks.
45
Figures 3 and 4 are perspective views of the key
block and the connecting block, respectively.
Referring in detail to the drawing i denotes
a header beam and 2 represents a stringer beam.
The header and stringer beams are constructed
50 in various lengths to meet any requirements and
conditions found in practice.
The beams I and 2 are substantially H-shaped
in transverse cross section, having their upper
and lower faces deeply recessed to form longi
55 tudinally disposed grooves, respectively indicated
at 3 and 4, which are half-round and extend uni
formly throughout the lengths of the beams. The
construction of the header beam l and of the
stringer beam 2 are preferably identical in con
struction, excepting that each end of the gooves
3 of the header beams is closed by an end wall 5,
while the ends of the grooves 4 of the stringer
beams are open.
Figure 1 illustrates a front view of cribbing
work employing my improved header beams l 10
and stringer beams 2, which are arranged alter
nately in parallel rows and in super-imposed re
lation to each other. The stringer beams of
each row are disposed horizontally in longitudi
nal alignment with their adjacent ends abutted - 15
against each other. The header beams of each
row are disposed at right angles with respect to
the position of the stringer beams, and the ends
thereof overlap the abutting ends of adjacent
stringer beams.
The assembly of the header and I ‘
stringer beams is identical in its arrangement to
the practice now in common use in cribbing work.
An integrally formed, substantially T-shaped
key block 6, comprising a stringer cross-arm 1
and a header arm 8, is provided and employed for as
looking together the abutting ends of the stringer
beams 2 and the overlapping end of the header
beam l. The arms ‘I and 8 are semi-cylindrical
in transverse cross section, and extend at right
angles relatively to each other. 1 One end of the F:
?at side of the header arm 8 joins with‘ the flat
side of the stringer cross-arm 1, central of the
length of the latter, and extends to but not be
yond the outer edge of said cross~arm 1.
The contour of the key block arms ‘I and 8
conforms to the contour of the grooves 3 and 4
in respective header and stringer beams l and 2.
In the assembly of the cribbing structure, the
cross-arms 1 of the key block 6 overlap the abut
ting ends of the stringer beams 2 and engage in
-i U
the grooves 4 in the latter. The arms 8 engage in
the grooves 3 of the header beams l, and the end
walls 5 overlap and engage the connected end of
said arm 8, as clearly shown in Figure 2. The
engagement of the header arms 8 by the end
walls 5 in the manner stated, prevents the spread
ing movement of the stringer beams from their
positions in connection with the header beams I.
The key blocks are preferably cemented in posi
tion in the grooves of the header and stringer
beams, by a suitable bituminous asphaltic cement.
Such mastic cement allows the slight movements
attending the settling adjustments of the inter
connected parts of the structure without liability 55
2
2,109,025
of fracturing said cement or said inter-connected
parts.
If for any reason it is required to close an
opening between two adjacent rows of stringer
beams, or between two adjacent rows of header
beams, a ?ller beam of similar conformation may
be employed. Suitable connecting blocks 9, either
cylindrical, as shown, or spherical in contour, are
engaged and cemented in the grooves of adjacent
beams, whereby the ?ller beam is held in posi
tion for material retaining or other purposes.
All parts of the cribbing structure, including
the header and stringer beams I and 2, and the
associated key and connecting blocks 6 and 9,
are constructed and precast of concrete embody
ing any suitable concretive composition materials.
Reenforcing rods H? are embedded in the beams
and extend longitudinally in the latter to provide
requisite strength and to allow reduction of their
transverse cross sectional areas to a minimum
for the conservation of weight.
It will here be noted that, while the grooves
3 and 4 in the beams l and 2, are herein illus—
trated and described as being half-round in
transverse cross section, it is obvious that the
con?guration of the grooves may be varied, and
correspondingly shaped key blocks provided for
use in connection therewith. However, the con
tour of the grooves should be such that the ex
30 pansion of any matter in said grooves, due to
freezing or other causes, will be outward to
ward the open side of the grooves and will not
act to apply force or pressure against any points
or parts of the wall of the grooves, whereby the
liability ‘ of fracturing the beams from such
causes is entirely eliminated. The bottoms of
the grooves 3 and 4 are provided with a plu
rality of apertures II to permit the drainage of
water therefrom that might accumulate in any
40 of the grooves.
Under conditions when it is not feasible to use
the key and connecting blocks 6 and 9 for lock
ing the ends of the beams together in the manner
set forth, a concrete mass of low slump consist
45 ency may be successfully employed instead of said
blocks.
From the foregoing description taken in con
nection with the accompanying drawing, the
construction and use of my improved cribbing
50 will be readily apparent to those skilled in the
art to which the invention appertains, and while
disclosing one embodiment of the invention, it is
evident that the novel features thereof may be
varied without departing from the spirit or sac
ri?cing any advantages of the invention.
What I claim is:
1. In a cribbing structure, the combination of
a pair of stringer beams having their adjacent
ends abutted against each other, a header beam
disposed at right angles to said stringer beams
and having an end thereof overlapping the abut
ting ends of said stringer beams, said beams be
ing constructed of reenforced concrete and be
ing
provided
with
longitudinally
extending
1O
grooves, said grooves having apertures extend
ing through the bottoms thereof, and a T-shaped
key block engaged in respective grooves for lock
ing the adjacent ends of said stringer and header 15
beams together.
2. In a cribbing structure including stringer
and hanger beams provided with longitudinally
extending grooves, an integrally formed key block
constructed of concrete and comprising a stringer 20
cross-arm, and a header arm disposed at right
angles to said stringer cross-arm and having one
end thereof joined with the center of the latter
the transverse contours of said stringer cross
arm and of said header arm respectively corre
sponding to the transverse contours of the
grooves of the stringer and header beams.
3. In a cribbing structure, the combination of
a pair of stringer beams having their adjacent
ends abutted against each other, a header beam 30
disposed at right angles to said stringer beams
and having an end thereof overlapping the abut
ting ends of said stringer beams, said beams be
ing constructed of reenforced concrete and be
ing
provided
with longitudinally
extending
grooves, and a T-shaped key block engaged in
respective grooves for locking the adjacent ends
of said stringer and header beams together.
4. In a cribbing structure, the combination of
a pair of stringer beams having their adjacent ,40
ends abutted against each other, a header beam
disposed at right angles to- said stringer beams
and having an end thereof overlapping the abut
ting ends of said stringer beams, said beams be
ing constructed of reenforced concrete and be 45
ing provided with longitudinally extending
grooves, said grooves being substantially half
round in transverse cross section, and a T-shaped
key block engaged in respective grooves for lock
ing the adjacent ends of said stringer and header 50
beams together.
RICHARD IRVIN.
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