Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
2~32~9
BACKGROUND OF INVENTION
Field of the Invention
The present invention relates to a pole
anchoring device for supporting large diameter poles
vertically over a hard surface such as rock, concrete or
the like and wherein the device comprises a harness
assembly interconnectable about a base section of the
pole to support spaced apart anchor bolts disposed
parallel to the pole and a predetermined distance
outwardly therefrom.
Description of Prior Art
In U.S. Patent No. 4,218,858, there is
described a pole anchoring device which is strapped about
the lower portion of a wooden pole whereby to support
that pole vertically over a rock surface. This
anchoring device has been primarily used for anchoring
small diameter wooden poles- such as electrical distribu~
tion or telephone poles. However, with very large
diameter poles of 20" or more, the anchoring bolt would
be subjected to a lot of stress at pole deflection loads
of 5 to 20.
I have therefore devised a new anchoring
assembly wherein I can retain the anchor ~olt attached to
the bottom section of the pole and spaced outwardly
therefrom whereby to greatly increase the retention force
of the pole anchoring device. Also, a new harness has
been developed for increased contact with the pole to
provide better retention of the pole when subjected to
lateral loads. The entire assembly is also symmetrical
2~320as
and made without any weld joints which could give way
when subjected to high working load due to -the deflection
of -these large poles.
Another feature of my pole anchoring device is
that my harness consists of modular or universal size
members which are adjustable to permit interconnection of
a plurality of these about a pole depending on the
diameter of the pole or else simply to increase the
anchor strength of the pole. ~ ;
SUMMARY OF INVENTION
It is therefore a feature of the present
invention to provide a pole anchoring device for
supporting poles vertically over a hard surface, such as
rock, concrete or the like, and wherein the device is
comprised of a harness assembly connected about a base
section of a pole to be supported on a hard surface.
Connecting means is provided to immovably secure the
harness assembly about the base section. The harness
assembly is comprised of harness members each having a
pole engaging section for abutment against a pole and a
bolt support section spaced outwardly from the pole
engaging section. An anchor bolt is guidingly positioned
in the bolt support section of each of the harness
members and extends along an axis substan-tially parallel
to the axis of the pole and spaced a predetermined
distance away from the bolt support section. Anchoring
means is secured to the anchor bolt and disposed below
the bolt support section. The anchor bolt has an
engageable top end portion extending in a top section and
partly above the bolt support section for engagement by
bolt engaging means to impart axial displacement of the
-- 2 ~
2~32009
anchor bolt in an upward direction to actuate the
anchoring means to anchor a lower end of the anchor bolt
in a bore hole formed in the hard surface and spaced
adjacent the pole.
BRIEF DESCRIPTION OF DRAWINGS
A preferred embodiment of the present invention
will now be described with reference to the accompanyiny
drawings in which:
FIGURE 1 is a side view illustrating the pole
anchoring device of the present invention as connected to -
a base section of a large diameter pole to support the
pole over a rock surface;
FIGVRE 2 is a cross-section view of the pole
anchoring device illustrated in Figure 1 illustrating the
configuration of the harness members;
FIGURE 3 is a fragmented end view showing more
details of the harness member;
FIGURE 4 is an enlarged view showing the
construction of the outer channel section of a harness
member and alternate guide means to maintain the anchor
bolt in the outermost portion of the outer channel
section;
FIGURE 5 is a section view showing the bolt
anchor construction; and
FIGURES 6A to 6C are plan views illustrating
poles of varying diameter with harness assemblies having
different numbers of harness elements.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the drawings, and more
particularly to Figures 1 and 2, there is shown generally
at 10, the pole anchoring device of the present invention
. . .
20~2005
for supportincJ a large cliameter pole 11, for example
anywhere from 14" to ~3", vertically over a hard rock
surface 12. The medium or surface 12 could be solid
rock, a concrete bed or any other hard medium. The pole
may be a wooden pole or poles made of concrete, steel or
any other material.
The pole anchoring device 10 comprises a
harness assembly formed by three or more harness members
13, interconnectable to one another abou-t a base section
1~ of the pole 11. As can be better seen from Figure 2,
each of the harness members 13 is formed from a metal
plate, herein a galvanized steel pla-te, and shaped to
define an outer channel section 15 having a bolt support
section 16 in a trough outermost portion thereof. As
hereinshown, the outer channel section is formed as a
shaped channel section with opposed side walls 17 being
outwardly inclined. These inclined wall sections also
merge within a respective one of opposed curved wall
sections 18 which each constitute a pole engaging section
for attachment against the pole 11. At the end of these
curved wall sections 13, there is formed a connecting
flange 19 and these flanges are provided with holes 20,
see Figure 3, whereby to receive therethrough connecting
bolts 21 to secure opposed harness members, such as 13
and 13' in Figure 1, together abou-t the circumference of
the pole 11. The harness members 13 are symmetrical and
therefore universal. At least two further holes 9 are
spaced apart in vertical alignment in each of the opposed
side walls 17 and transversely aligned in pairs to
receive a bolt, herein one of the connecting bolts 21,
temporarily therein to compress the side walls 17 closer
2032009
together to provide adjustability of the harness about a
pole. By co~pressing the side walls 17, the harness
members 13 will deform to adapt to the slight taper that
may exist in -the pole such tha-t the curved wall sections
18 contact the pole throughout its length.
As is also illustrated in Figure 1, a long
anchor bolt 22 is guidingly positioned in the ou-termost
bolt support section 13 and extends parallel to the pole
11 and to the other bolts 22' and spaced a distance "d"
from the outer side wall of the pole 11. This spacing
provides for more stability and greater resistance to
pole deflection when the pole is subjected to lateral
loads.
The anchor bolt 22 has an anchoring assembly 23
in a bottom end thereof with the assembly 23 extending
into a bore hole 24 drilled in the rock surface 12. The
top end portion of the anchor bolt has an engageable end
portion and, as hereinshown, constituted by a threaded
upper end portion 25 about which a nut 26 is in threaded
engagement and arrested on a gripper spacer or washer
element 27 supported across the top edges 28 of the outer
channel section 15 and in contact with the pole. By
threading the nut 26, the bolt 25 will move axially
upwards whereby to actuate the anchoring assembly 23 to
anchor a lower end of the anchor bolt 22 in the bore hole
24. Figure 2 gives a better illustration o~ the
positioning of the bolts relative to the pole.
Referring now additionally to Figures 3 to 5,
it can be seen that the harness members 13 are also
provided with arresting means in the form of connecting
holes 29 also disposed spaced apart along the wall
. .
203200~
sections 18 whereby to receive therethrough lag bolts 30
which are threaded or driven into the pole 11, if the
pole is a wooden pole, as shown in Fiyure 2. Alternate
arresting means can be provided as is obvious to a person
skilled in the ar~.
As can be seen from Figure 1, a plurality of
bolts 21 can be secured along the flanges 19 at regular
spaced intervals in order to place the harness members in
compression retention about the base section 14 of the
pole 11. Guide means in the form of spaced apart guide
bolts 31 extend across the outer channel section spaced
adjacent the trough outermost portion 16 whereby to
captivate the bolt 22 in this outer trough portion 16.
Alternate guide means such as the indenture 33 may be
punched from the side walls 17, as shown in Figure 4, on
each side of the trough outermost portion 16 to retain
the bolt 22 captive therein. Aligned holes are punched
from the side walls 17, as shown in Figure 3, whereby to
receive the guide bolts 31 thereacross.
Abutment means in the form of a plate 34 (see
Fig. 4) or a gripper spacer 27 is supported over the top
and bottom ends of the opposed walls 17 of -the outer
channel section 15 whereby to provide abutment for the
nut 26 in the top end and for the end of the sleeve
section 35 of the anchoring assembly 23. As shown in
Fig. 1, the sleeve section 35 may ex-tend a few inches
above -the bore hole 24 so that the sleeve also provides
added resistance to lateral bending loads on the pole.
The sleeve section 35 is made of heavy gauge steel and is
in close fit in the bore hole 24. This also positions
... .. . .
20320V~
the harness assembly a little higher on the base section
l~ of the pole for added res:istance to the bending
moment.
As can be seen in Figures l and 5, the
anchoring assembly comprises a bottom expansion shell 36
which slides over the bolt and is arrested by the conical
bottom end 37 of the anchor bolt 22. The sleeve section
35 sits on this shell 36 and forms an isolation joint 36'
therewith. This expansion shell is slit, as at 38, to
provide expansion wall sections 39 which have gripping
ridges 40 on the outside wall thereof to grip with the
side wall of the bore hole 24 when displaced outwardly by
axial upward movement of the anchor bolt 22 when a
pulling force is exerted on the bolt 22 by flexion in the
pole ll. This expansion shell grips the side wall of the
bore hole and will permit slight axial movement of the `
entire harness assembly when under severe load, allowing
the anchor bolts together with the harness to move
slightly upward, thereby causing additional expansion of
the shell 36 and increasing the holding power in its bore
hole. However, the shell 36 does not move relative to
the bore hole but merely expands preventing the bore hole
from being expanded. The only movement in the hole is
the bolt within the sleeve 35 and the channel sec-tion 15.
The nut 26 can then be retightened to take up the slack
between the bolt and the harness.
Although in the example herein described, there
is shown a pole anchoring device having only three
harness members 13 interconnected about the pole ll, it
is pointed out that with larger diameter poles, there are
more of these harness sections, for example, six or more
-- 7
. . .
2~32~vg
sections, as shown in Figures 6A to 6C. It is further
pointed out that the manner in which the harness members
are interconnected together, the manner in which the
anchor bolts are retained in the outermost part of the
outer channel section 15, and the specific shape of the
outer channel sec-tions, can be varied without departing
from the ambit of the present invention. It is also
pointed out that by forming the harness members as
described herein, welds are totally eliminated thus the
entire pole anchoring device is stronger, easier to
manufacture and less costly. Because the harness members
are also symmetrical, they can be assembled in either
direction.
As shown in Figure 6A, there are three harness
members 13 positioned about a pole 11 having a diameter
of 19". Each modular harness member 13 has a pitch P of
15.75". By compressing the side walls 17 of the rnembers
13 by the use of bolts 21 in holes 9, an additional
harness member 13 can be provided about the pole
increasing the resistance strength of the harness
assembly, if desired. Of course, the connecting flanges
19 would be spaced closer together as shown in Figures 6B
and 6C. These additional two figures 5how harness
assemblies with many more members 13 disposed about their
base section diameters. Figure 6B is a pole of 26"
diameter, while Figure 6C illustrates a pole with a 43"
diameter.
Tests of my new pole anchoring device 10 using
the same diameter of anchor bolt, have been effectuated
and compared with the test of my anchoring device as
described in U.S. Patent No. 4,218,858 and the resistance
2032009
to bending moments or transverse load has been found to
be improved by abo~t tenfold (XlO), this comparison
having been made with a harness assembly having three
harness elements only. If a fourth element 13 was to
have been added to the assembly, the results would have
been superior. The followincJ table lists the test
parameters and results of tests effectuated on a pole
having a diameter of 19.5". The pole failed when
reaching a load of 220.000 Ibs.
LOADMOMENT AT BASEDEFLECTION OF POLE
K K-FT ~DEG)
4 40 0.3
6 60, 0.5
8 80 1.1
100 1.8
12 120 2.4
14 140 3.4
16 160 4.0
18 180 5.5
19 190 8.2
21 210 12.8
Summarizing the installation, we firstly
de-termine the number of components or harness elements to
be included in the harness assembly. The bore holes are
drilled and the harness is assembled loosely about the
pole base section with the anchor bolts in the bore
holes. If necessary, some of the bolts 21 are disposed
in the holes 9 to compress the side walls 17 of the
channel sections 15. The curved sections 13 of the
harness will conform to the surface of the pole and the
lag bolts 30 are then driven into the pole to maintain
the harness members 13 in position. The bolts 21 are
then removed from the holes 9 and inserted in -the holes
of their respective pairs of connecting flanges 19 and
: , . .
, ~ ,
20320~9
tightened. The base of the pole 11 is sitting on the
ground surface 12 and the jacket or harness is elevated
by the projection oE the sleeves 35 about the ground
surface.
'
-- 10 --
.: . ~ . . . :
