more than the parent metal of stub (usually structural Mild Steel) strength.
Since the towers with different design, size and base width are subjected to testing in
the tower testing station. After testing of each tower, in case of any error, the stubs are cut
from the base plate and the surface of the base plate is smoothened again in order to
accommodate another stub and said testing process is repeated.
Therefore, the conventional practice of stub setting for a transmission line tower and
its testing therein is a very tedious job, which involves substantial time, manpower and
resources. In order to minimize the time frame and labor cost the alternate arrangement has
been suggested for the same.
Therefore, this present invention is intended to develop a novel stub setting
mechanism which can minimize the time and manpower involved, especially in the busy
tower testing stations due to huge demand for testing of transmission line towers; wherein the
instant stub setting mechanism does not involve welding of said stubs on base plates.
4.3. Objective of the Invention:
The primary objective of this present invention is to overcome the drawbacks
associated with the conventional stub setting process for testing of transmission line towers
which conventionally involve welding of stubs on base plates and wherein said towers may
be selected with different design, size and base width in the tower testing station.
Another object of the present invention is to propose to a novel stub setting
mechanism for testing of transmission line towers, particularly relates to a stub arrangement
of tower testing station with newly developed stub setting mechanism.
Another object of the invention is to propose a stub arrangement of tower testing
station wherein said stub arrangement particularly includes the installation of the stub, firmly
mounted with a stub-hub and pin/hinge cylinder assembly at its lower end, into a novel
bearing mounted with the base plate of said stub setting template.
Another object of the invention is to propose a stub arrangement of tower testing
station, wherein it comprises a specially designed bearing with the revolute joint mechanism,
to be mounted with or created as inbuilt structure of the base plate, and for accommodating
the assembly of stub=hub and pin/hinge cylinder of the stub^ particularly in an optionally
selected angle therein.
Another object of the invention is to propose a customized and preferred embodiment
of a Main Bearing Bracket with the revolute joint mechanism towards realizing the novel stub
setting mechanism for testing of transmission line towers; wherein the constructional features
of the said Main Bearing Bracket is so provisioned that it accommodates the assembly of
stub-hub and pin/hinge cylinder within its cavity through engaging its bearings with the said
stub-hub and pin/hinge cylinder assembly therein.
Another object of the invention is to invention is to propose such a stub setting
mechanism for testing of transmission line towers, which successfully meets the requirements
of load bearing standards, namely IS: 802-Part-III: 1978 (Indian towers) and IEC:
60652:2002 (international towers) also comply to the strength requirements of CATIA
simulation of complex loading conditions (similar to real loading conditions).
4.4. Statement of Invention:
The present invention discloses an improvement in stub setting mechanism for testing
of transmission line towers. Presently the stub setting job of transmission line tower is tedious
and time taking, which delays the erection and testing time due to traditional methods of stub
setting.
The invention is intended to propose a preferred embodiment of a Main Bearing
Bracket with the revolute joint mechanism towards realizing the novel stub setting
mechanism for testing of transmission line towers; wherein the constructional features of the
said Main Bearing Bracket is so provisioned that it accommodates the stub-hub and pin/hinge
cylinder assembly within its cavity through engaging its bearings with the said stub-hub and
pin/hinge cylinder assembly therein.
The inventiveness involved with one preferred embodiment of the present invention is
that, it facilitates the stub setting job faster, have probability of minimal errors during testing,
involves no welding job and requires relatively less resources, namely less man power, time
and efforts. Compared with the prior arts, the instant stub setting mechanism is a simple
mechanical structure which can serve the purpose as used in traditional methods of stub
setting with comparatively much lesser time and man power.
4.5. Summary of the Invention:
The present invention discloses an improvement in stub setting mechanism for testing
of transmission line towers. The proposed stub setting mechanism particularly comprises of a
specialized and uniquely designed bearing with a revolute joint mechanism, to be mounted
with or created as inbuilt structure of the base plate, and for accommodating the hub and pin
assembly of the stub, particularly in an optionally selected angle therein. Said bearing with a
revolute joint mechanism is so designed and customized that it can serve efficiently the
purpose as used in traditional methods of stub setting, but by involving comparatively much
less time and man powers therein.
The present invention particularly relates to a novel stub setting mechanism for testing
of transmission line towers, particularly relates to a stub arrangement of tower testing station
with newly developed stub setting mechanism.
The invention, as disclosed herein, relates to the stub arrangement comprising of the
firm mounting of the lower end of the stub unit with a hub and pin assembly, and then
installing the said lower end of the stub into a novel bearing integrated with or created within
the base plate of said stub setting template. The stub arrangement of tower testing station
comprises a specially designed bearing with a revolute joint mechanism, to be mounted with
or created as inbuilt structure of the base plate, and for accommodating the hub and pin
assembly of the stub, particularly in an optionally selected angle therein.
The invention also discloses one preferred customized embodiment of a Main Bearing
Bracket with the revolute joint mechanism towards realizing the novel stub setting
mechanism for testing of transmission line towers; wherein the constructional features of the
said Main Bearing Bracket is so provisioned that it accommodates the stub-hub and pin/hinge
cylinder assembly within its cavity through engaging its bearings with the said stub-hub and
pin/hinge cylinder assembly therein.
It is important to analyze the efficiency and effectiveness of the instant stub setting
mechanism for testing of transmission line towers, and therefore examination through the
simulation studies using CATIA of the said stub setting mechanism including its component
assembly therein as well as a comparative analysis with respect to the traditional practice is
provisioned. The novelties of the present invention are as follows: (a) this mechanism can
reduce the stub setting time, (b) reduces the man power requirement for the same job; (c) It
replaces the welding process(d) It ensures less chance of getting error.
4.6. Detailed Description of the Invention:
Brief description of the drawings:
The figures 1-16 illustrate the various views of the stub setting mechanism.
Fig. 1 A representative view of transmission line tower fixed on stub alone with base plate
and foundation rail.
Fig. 2 A Schematic view of the conventional Stub arrangement of Tower Testing Station.
Fig. 3 Schematic view of the instant Stub arrangement of Tower Testing Station with
newly developed Stub setting Mechanism and the preferred schematic embodiment
of the Main Bearing Bracket.
Fig. 4 Different Schematic views of the Stub arrangement of Tower Testing Station with
newly developed Stub setting Mechanism, showing its major structural components.
Fig. 5 Different schematic views of conventional Stub with base plate.
Fig. 6 Different schematic views of the newly proposed Stub and its lower leg arrangement
with stub-hub and pin/hinge cylinder assembly.
Fig. 7 Different schematic views of the newly proposed Main Bearing Bracket mounted on
the base plate, depicting the main cavity and Main Bearings of the said Main
Bearing Bracket towards realizing the revolute joint mechanism in different angles.
Fig. 8 Isometric view of the conventional Single Stub welded onto the base plate.
Fig. 9 Isometric view of the newly proposed Single Stub mounted onto the base plate using
the novel assembly provisions, particularly the Stub mounting arrangement by
applying the constructional features of the preferred embodiment of the Main
Bearing Bracket.
Fig.10 CATIA simulation of complex loading conditions just before start of deflection, for
conventional art.
Fig. 11 CATIA simulation of complex loading conditions just before start of deflection, for
present art of Stub arrangement of Tower Testing Station.
Fig.12 Loading conditions of lower half (Partial view)
Fig.13 Loading conditions of middle part (Partial view)
Fig.14 Loading conditions of upper half (Partial view)
Fig. 15 CATIA simulation of complex loading conditions after getting deflection for prior
art.
Fig.16 CATIA simulation of complex loading after getting deflection, for present art.
Short details of the numeral indicators, used in the labeling of schematic drawings
representing the Stub arrangement of Tower Testing Station and the proposed Stub Setting
Mechanism thereof, are as under:
1
2
3
4
5
6
7
8
9
10
11
12
Represents a stub along with tower, base plate and rails.
Represents the Stub unit of the tower, wherein in the instant stub setting mechanism
its lower leg section comprises with a stub-hub (7).
Represents the base plate, rigidly/fixedly mounted with Main Bearing bracket (5),
accommodating the assembly of stub-hub (7)-pin/hinge cylinders (10).
Represents the Foundation rail, upon which the base plate and the Stub arrangement
is installed.
Represents the Main Bearing bracket, rigidly/fixedly mounted or integrated on the
Base Plate (3) which accommodates the assembly of stub-hub (7)-pin/hinge cylinders
(10) towards realizing its revolutejoint mechanism in the instantly proposed Stub
setting arrangement.
Represents the Main bearing(s) of the Main Bearing Bracket (5), which engages both
the ends of the pin/hinge cylinder (10).
Represents the Stub-hub, created/mounted at the lower leg section of the stub (2).
It represents plurality of studs, applied for fixing/mounting the base plate (3) on the
Foundation rail (4).
Represents the welding position of the lower stub leg section of the stub (2) on the
base plate (3), particularly in a conventional stub setting arrangement.
Represents the pin/hinge cylinder, passing through the stub-hub (7), wherein both the
free ends of said pin/hinge cylinder are accommodated within a pair of Main
bearings (6) of the Main Bearing Bracket (5), rigidly/fixedly mounted on the base
plate (3); particularly towards realizing the instantly proposed stub setting
mechanism in the Tower Testing Station.
Represents the plurality of slots in the base plate (3) for applying studs (8),
preferably screw-studs, towards rigid/fixed mounting the base plate (3) on the
Foundation rail (4).
Represents the cavity within the Main Bearing Bracket (5) of the instantly proposed
stub setting mechanism, which effectively and firmly accommodates the assembly of
stub-hub (7) and the pin/hinge cylinder (10) to realize its revolute joint mechanism.
In Figure 1 transmission line tower fixed on stub (2) alone with base plate (3) and
foundation rail (4) is shown.
The drawing pertaining to the traditional stub setting method is shown in Figure 2,
wherein stub setting involves shifting of the base plate (3) to the desired location, based on
the tower base distance from foundation rail on which the stubs are mounted by means of
electric arc welding. The distance and inclination between the two diagonally positioned
stubs (2) are maintained by accurately calculating the tower base and slope as per the detailed
drawing. After that, the stub (2) has been temporarily fixed on the base plate (3) by
measuring the exact distances from the center of the tower bed by spot welding. Once the
distances between the tower bases, diagonal distances and inclinations of each stubs therein
are corrected, the final welding are done. In such welding practice selection of welding bid
with sufficient thickness is also vital, keeping in mind that the welding strength should be
more than the parent metal of stub (usually structural Mild Steel) strength. Since the towers
with different design, size and base width are subjected to testing in the tower testing station.
After testing of each tower, in case of any error, stub (2) is cut from the base plate (3) and the
surface of the base plate (3) is smoothened again in order to accommodate another stub (2)
and said testing process is repeated.
Therefore, the conventional practice of stub setting for a transmission line tower and
its testing therein is a very tedious job, which involves substantial time, manpower and
resources. In order to minimize the time frame and labor cost the alternate arrangement has
been suggested for the same.
In Figure 3 the stud arrangement of tower testing station with the instant stub setting
arrangement is shown. To eliminate the conventional practice of welding the lower leg
sectipn of die stub (2) on the base plate (3-), depicted as position (9) in Figures 5 and 8, the
said lower leg section of the stub is provisioned with a stub-hub (7), as shown in Figure 6.
The stub-hub (7) is so formed or mounted at the lower leg section of the stub (2) that it has a
cylindrical pass throughout its main body so that a pin/hinge cylinder (10) is engaged within
the said pass of the stub-hub (7). Alternatively, in an optional embodiment, the construction
of said stub-hub (7) is so selected that two pin/hinge (10) positions are created on the body of
said stub-hub (7) in the same line, in view of a revolute joint mechanism for mounting the
said stub (2) using a specially designed bearing assembly.
As per the schematic representations of Figure 3, the base plate (3) is mounted with
the foundation rail (4) using plurality of studs (8). The base plate (3) is rigidly mounted with
or provisioned with an inbuilt specially designed bearing assembly (5) which comprises of
bearing(s) (6) to assembly and integrate stub (2), involving the revolute joint mechanism due
to provision of stub-hub (7) and pin/hinge cylinder (10) therein. The revolute joint
mechanism of said bearing assembly (5) helps in standardization of various parameters for
testing of transmission towers and positioning of stubs therein without involving any welding
work between base plate (3) and lower leg section of the stub (2).
In a preferred embodiment of the Stub arrangement of Tower Testing Station and the
proposed Stub Setting Mechanism thereof, as depicted in Figure 3, 4 and 9, a specifically
designed Main Bearing Bracket (5) as one preferred and customized embodiment of the
bearing assembly is employed towards integration of the stub (2) on the base plate (3). Said
Main Bearing Bracket (5), as schematically shown in Figure 7, is rigidly/fixedly mounted and
integrated on the base plate (3), preferably by welding or by nut-bolt provisions therein. The
Main Bearing Bracket (5) comprises of a pair of bearings (6), wherein said bearings (6) are
provisioned to accommodate the pin/hinge cylinder (10) towards realizing the revolute joint
mechanism while integrating the Stub (2), mounted with stub-hub (7), within the said Main
Bearing Bracket (5), and thus on to the base plate (3) of the said Stub arrangement of Tower
Testing Station. The dimension and structural features of said Main Bearing Bracket (5) are
mainly made compatible to the stub-hub (7), mounted or created at the lower leg section t>f
the stub (2), wherein the said Main Bearing Bracket is provisioned with a central cavity (1*2)
within its body to firmly and suitably accommodated assembly of said stub-hub (7) and
pin/hinge cylinder (10). On two parallel and vertical walls there are two bearings 6,
positioned in such a manner that each one engages one end of the pin/hinge cylinder (10)
passing through the stub-hub (7). Such complete assembly within the cavity (12) of the Main
Bearing Bracket (5), that is engaging both ends of the pin/hinge cylinder (10) within two
parallel and vertically positioned bearings (6) wherein said pin/hinge cylinder (10) already
passes through the cylindrical pass of the stub-hub (7) of the stub (2), provides easy and
quick load-standardization and stub positioning exercise during the Stub arrangement of
Tower Testing Station, particularly due to the said bearing based revolute joint mechanism of
the said Main Bearing Bracket (5).
Therefore the present disclosure with the help of exemplary drawings particularly
relates to a stub setting mechanism consists of a specialized and uniquely designed Main
Bearing Bracket (5) with a revolute joint mechanism, which serves the purpose of a stub
setting arrangement in any tower testing stations, wherein the lower leg section of the stub (2)
is also made compatible by creating/mounting a stub-hub (7) which is capable of
accommodating a pin/hinge cylinder (10) within its cylindrical pass. This proposed
mechanism provides a better ability to accommodate different types of towers and firmly
fixed with the stub (2) with a minimal effort.
Thus, as per the Figure 9, the stub (2), mounted with stub-hub (7) gets assembled and
integrated within the Main Bearing Bracket (5), particularly using the pair of bearings (6) and
the pin/hinge cylinder (10). Thus the bearings (6) with a revolute joint mechanism in the
specialized designed Main Bearing Bracket (5), automatically orients the stub arrangement in
the direction of tower slope.
The proposed method of the invention shows a simplified mechanism which replaces
all the tedious job of welding and finishing of stub (2). Since the towers with different design,
size and base width are subjected to testing in the tower testing station. After testing of each
tower the stubs are being cut and finishing of the surface of the base plate are accomplished
in order to accommodate another stub.
The proposed methodology replaces the welding which ultimately reduced the time
taken for the same. The major works involves in tower testing are stub setting, erection of
tower and testing or loading the tower as per standards IS : 802; Part- III : 1978 for Indian
towers and IEC : 60652 : 2002 (International towers). The stub setting process consumes an
appreciable amount of time, manpower as well as cost and therefore the instant Main Bearing
Bracket (5) and stub-hub (7)-pin/hinge cylinder (10) based stub setting mechanism for testing
of transmission line towers has ample scope of application.
In the proposed methodology the base plate (3) on which the mechanism is fixed only
needs to be shifted to the proper location on the foundation rail (4), as per the distance
required. Then the tower leg has to be fixed by means of nut and bolt. The specialized
designed bearing with a revolute joint mechanism, as explained with the figures (mainly in
Figures 4, 5, 6, 7 and 9), is so designed that it automatically orients the stub arrangement in
the direction of tower slope.
Said stub setting mechanism is applicable to all kind of testing of transmission towers and to
all complex load conditions, preferably by adjusting and customizing the load bearing
strength and dimension of the Main Bearing Bracket (5), its bearings (6) and the pin/hinge
cylinder (10); and the strength, dimension and size of stub-hub (7) mounted with the lower
leg section of the stub (2); particularly by standardizing the stub setting parameters as per the
strength requirements of CATIA simulation of complex loading conditions (similar to real
loading conditions).
Simulation of the Present Model of Stub Setting by Application of the Novel Bearing
Based Revolute Joint Mechanism:
In traditional design the stub setting is done by using the Theodolite apparatus for
measuring the slope and horizontal height in inclined position (based on tower leg
inclination).
The present invention replaces the job for stub setting process and eliminates the act
of welding each stub, and then cutting it from the base plate. Further, welding is a permanent
fastening, slight mistake /changes in dimension may result in the mismatch of dimensions
which would require repeating the entire process once again.
This can be corrected by adjusting the base plate on the rail with the required distance
(base width and diagonal distances) between the tower legs in the proposed method. Further,
the different bolt holes in the stub accommodate different size of towers, on which the tower
leg can be fitted and adjusted as per the stub height.
The specially designed stainless steel bearing(s) (6), within the embodiment of Main
Bearing Bracket (5), can sustain the complex stresses, which is imparted during the testing.
These stresses are substantially transferred to the base plate (3) and then to the foundation rail
(4) through the said stainless steel bearing(s) (6), and finally bears the complex 3D loads to
serve the purpose. Both models for stub setting, presently proposed one as weir as the
traditional one, have been tested via CATIA simulation software and it has been found that in
comparison to the traditional model, the present model involving the Main Bearing Bracket
(5) and its revolute joint mechanism therein also exhibits similar strength for the purpose of
testing of towers.
Both the models (traditional and the presently proposed herein) have been designed
andsimulated--using-C ATIA software. The C ATI A simulation for-boththe models are shown
in Figures 10-16. The three dimensional loads are applied in three orthogonal directions in
order to see the effect of complex loading conditions (similar to real loading conditions), as
shown in the figures herein below. The purpose is to see the effect of newly design stub
mechanism which should at least carry the same loads as compared to present practice of stub
arrangements.
In Figures 10 and 11 the same loads have been applied in both the models (in
traditional model (Figure 10) as well as in the presently proposed model (Figure 11) of stub
setting). In presence of the complex loading conditions, upto certain limited loads, it has been
observed that the new model comprising the specially designed stainless steel bearing(s) (6),
within the embodiment of Main Bearing Bracket (5), shows similar resistance as shown by
the traditional model. Subsequently on further loading the models, as shown in Figures 12 to
16 deflections are observed, which starts at the stub end. However, the joint at (9) as shown
in Figure 15 between base plate (3) and the stub (2) (in traditional practice) & the joint
between stub (2) and stub-hub (7) on the bearing assembly (in newly designed mechanism) as
shown in Figure 12, 16 remain intact. From the above simulation it can be concluded that, the
developed design can efficiently be used for the purpose. The specially designed stub
mechanism can sustain the complex stresses, which is imparted during the testing. The newly
developed mechanism can save the time, manpower and cost of stub setting process.
Scope of the invention:
Although the invention has been described with reference to specific embodiments, this
description is not meant to be construed in a limiting sense. Various modifications of the
disclosed embodiments, as well as alternate embodiments of the invention, will become
apparent to persons skilled in the art upon reference to the description of the invention. It is
therefore contemplated that such modifications can be made without departing from the spirit
or scope of the present invention as defined.

claim:
1. Stub setting mechanism for testing of transmission line towers, wherein said
mechanism comprises of firm mounting of the stub (2), firmly mounted with a stubhub
(7) and pin/hinge cylinder (10) assembly at its lower end, into the customized
bearing assembly as the customized bearing assembly (5), firmly mounted with the
base plate (3) of said stub setting template; wherein said stub setting mechanism is
characterized in the revolute joint mechanism of said customized bearing assembly
(5), which helps in standardization of various parameters for testing of transmission
line towers and positioning of stubs therein without involving any welding work
between base plate (3) and lower leg section of the stub (2).
2. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein one preferred embodiment of the customized bearing assembly is the
embodiment of Main Bearing Bracket (5) with the revolute joint mechanism towards
realizing the novel stub setting mechanism for testing of transmission line towers;
wherein the constructional features of the said Main Bearing Bracket (5) is so
provisioned that it accommodates the stub-hub (7) and pin/hinge cylinder (10)
assembly within its cavity (12) through engaging its bearings (6) with the said
pin/hinge cylinder (10), already accommodated within the cylindrical pass of the stubhub
(7) therein.
3. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein said stub setting mechanism is characterized in the Main Bearing Bracket (5)
comprising of the bearings (6) and its revolute joint mechanism thereof, which
enables the stub arrangement for its automatic orientation in the direction of tower
slope.
4. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein said stub setting mechanism is characterized in the base plate (3), on which
the customized bearing assembly (5) integrated with the stud (2) through the revolute
joint mechanism of said bearing assembly (5) is fixed, needs only to be shifted to the
proper location on the foundation rail(4), as per the distance required to accommodate
the legs of the tower to be tested.
5. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein the stub-hub (7) is so formed or mounted at the lower leg section of the stub
(2) that it has a cylindrical pass throughout its main body, so that a pin/hinge cylinder
(10) is engaged within the said pass of the stub-hub (7); and wherein alternatively in
an optional embodiment, the construction of said stub-hub (7) is so selected that two
pin/hinge (10) positions are created on the body of said stub-hub (7) in the same line,
compatible to be accommodated within two bearings (6) of the Main Bearing Bracket
(5).
6. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein the assembly of Main Bearing Bracket (5) with a revolute joint mechanism, is
created as inbuilt structure of the base plate or to optionally it is rigidly/fixedly
mounted on the said base plate (3), preferably by welding or by nut-bolt provisions
therein.
7. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein bearings (6) of the Main Bearing Bracket (5) are preferably stainless?-steel
bearings, wherein assembly of stub (2) mounted within stub-hub (7) within the- said
Main Bearing Bracket (5) is characterized in its substantial strength against presence
of load and meeting the requirements of load bearing standard for testing of
transmission line towers, namely IS:802-Part-III: 1978 (Indian towers) and
IEC:60652:2002 (International towers) also comply to the strength requirements of
CATIA simulation of complex loading conditions (similar to real loading conditions).
8. Stub setting mechanism for testing of transmission line towers, as -claimed- in claim 1,
wherein Main Bearing Bracket (5) as one preferred and customized embodiment of
the bearing assembly is employed towards integration of the stub (2) on the base plate
(3), the Main Bearing Bracket (5) comprises of a pair of bearings (6), wherein said
bearings (6) are provisioned to accommodate the pin/hinge cylinder (10) towards
realizing the revolute joint mechanism while integrating the Stub (2), mounted with
stub-hub (7), within the said Main Bearing Bracket (5), and thus on to the base plate
(3) of the said Stub arrangement of Tower Testing Station.
9. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein the dimension and structural features of said Main Bearing Bracket (5) are
mainly made compatible to the stub-hub (7), mounted or created at the lower leg
section of the stub (2), wherein the said Main Bearing Bracket is provisioned with a
central cavity (12) within its body to firmly and suitably accommodated assembly of
said stub-hub (7) and pin/hinge cylinder (10).
10. Stub setting mechanism for testing of transmission line towers, as claimed in claim 1,
wherein said stub setting mechanism is applicable to all kind of testing of
transmission towers and to all complex load conditions, preferably by adjusting and
customizing the load bearing strength and dimension of the Main Bearing Bracket
(5), its bearings (6) and the pin/hinge cylinder (10); and the strength, dimension and
size of stub-hub (7) mounted with the lower leg section of the stub (2); particularly by
standardizing the stub setting parameters as per the strength requirements of CATIA
simulation of complex loading conditions (similar to real loading conditions).