FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
1. Title of the invention: A GRILLAGE FOUNDATION
2. Applicant(s)
NAME NATIONALITY ADDRESS
KEC International Ltd Indian RPG House, 463, Dr. Annie Besant Road, Worli, Mumbai - Maharashtra 400 030, India
3. Preamble to the description
COMPLETE SPECIFICATION
The following specification particularly describes the invention and the manner in which it
is to be performed.

BACKGROUND [0001] Power transmission system transmits electrical energy from an electricity generation site to an electrical substation. In recent years, with increasing power demands and to cover different geographical terrains, deployment of power transmission systems, such as transmission lines, is expanding at a rapid pace. Installation of the power transmission line may involve erecting power transmission structures. Such transmission structures have to be erected on a foundation which has to be designed to withstand the different types of loads that transmission lines are subjected to. In general, most of the foundations of transmission towers are concrete based foundations.
BRIEF DESCRIPTION OF DRAWINGS [0002] The detailed description is provided with reference to the accompanying figures, wherein:
[0003] FIG. 1 illustrates a perspective view of a grillage foundation, in accordance with one example of the present subject matter; [0004] FIG. 2 illustrates top view of a base portion of a grillage foundation, in accordance with an example of the present subject matter;
[0005] FIG. 3A-3B illustrates different views of a grillage foundation, in accordance with an example of the present subject matter;
[0006] FIG. 4A-4B illustrates different views of a grillage foundation, in accordance with another example of the present subject matter; [0007] FIG. 5 illustrates a front view of an assembled grillage foundation under a transmission structure, in accordance with an example of the present subject matter; and

[0008] FIG. 6 illustrates a flowchart depicting exemplary method for
manufacturing a grillage foundation for supporting a super structure, in accordance with an example of the present subject matter.
[0009] It may be noted that throughout the drawings, identical reference numbers
designate similar, but not necessarily identical, elements. The figures are not necessarily to scale, and the size of some parts may be exaggerated to more clearly illustrate the example shown. Moreover, the drawings provide examples and/or implementations consistent with the description; however, the description is not limited to the examples and/or implementations provided in the drawings.
DETAILED DESCRIPTION
[0010] As may be understood, foundation of any superstructure plays an
important role in safety and satisfactory performance of the superstructure as it transmits the applied loads from the superstructure to the ground soil where the superstructure is erected. Such superstructure, such as transmission tower, without having a safe foundation, may be prone to structural instabilities and may even lead to the collapse of the transmission tower. These foundation holds the transmission tower at one place and restricts the effects of different types of loads acted on the transmission tower. Examples of such loads include, but may not be limited to, compression or downward thrust, tension or uplift forces, and lateral forces of side thrusts in both traverse and longitudinal direction.
[0011] Such foundations have to be designed to suit particular soil conditions as
well. Examples of some supporting foundations include, but may not be limited to, Spread foundation, Pile foundation, Raft foundation & Anchor Foundation. Such different types of foundations are discussed as follows:
Spread Foundation
[0012] Such foundations have a large rectangular plan dimensions which is
casted at site in a shallow excavated trench and then backfilled. These foundations

are casted separately for every individual leg of the tower. They are usually of the following types:
• PCC Pyramid Type – Constructed of concrete and steel reinforcement bars, with the base in the shape of the pyramid from which a column or a chimney extends and connected to the leg of the tower.
• RCC Single Step / Double Step type – Constructed using concrete and reinforcement steel bars with base slab in the shape of a rectangle which may be a single step or a double step base slaps and are connected by means of a column or a chimney directly to the leg of the transmission tower.
• Grillage foundation - Constructed using steel sections only, which may include single / two tiers of steel sections. Steel sections are placed perpendicular to each other and are connected through four angle profiles stemming out of the four corners of the steel section and connected directly to the leg of the transmission tower.
Raft Foundation:
[0013] This is a type of foundation in which all four foundation columns/chimneys
are connected together using a large foundation slab to form a massive structure and these foundation piers may be connected to each other with/without intermediate beams. They are constructed using concrete and reinforcement steel.
Pile Foundation:
[0014] Piles are long, slender foundation elements which are driven into the soil
by mechanical means or cast at site directly, generally using reinforcement steel and concrete. They may also be of steel, precast concrete, or composites. Piles may be used singly, or two or more piles are driven to create a closely-spaced group which is then structurally integrated through a pile cap and connected to the main leg of the tower.
Anchor Foundation:

[0015] Anchors are long, slender structural elements which may be made of steel
and constructed using a combination of steel and concrete. Anchors are often installed in a group and tied together through a concrete cap to form a foundation. Generally, they are of the following types.
• Plate Anchors are long rods with flat plates at various levels. They are placed in excavated holes and backfilled with soil.
• Screw Anchors are essentially augers which are screwed directly into the ground.
• Grouted Anchors are long rods which are placed in excavated holes and then grouted to fill the annulus.
[0016] It may be noted that, the above explained foundation use concrete as one
of the main elements which makes them costlier and increases their construction cycle time as well. In an example, the constructor has to wait for a curing period at each stage during construction of such foundation. Such foundations therefore may not offer desired cost benefits and may also not be quick to assemble.
[0017] Examples of a grillage foundation for supporting a superstructure are
described. The grillage foundation as described may be used in lieu of concrete foundations with several advantages. The grillage foundation is made of two or more than two-tier beams placed at the right angles such that the tower loads are evenly dispersed over a large area. The main advantages of such grillage foundations are their low cost and ease of installation. They may be entirely shop-fabricated, i.e., manufactured in the factory and despatched along with the fabricated tower materials. Furthermore, such grillage foundations require minimal installation time and allow immediate tower assembly at site.
[0018] In an example, the grillage foundation includes a base portion. The base
portion may further include a first channel member and a second channel member which are to be placed parallelly and spaced apart on a surface. Each of the first channel member and the second channel member further include a plurality of

grooves positioned along their length. In an example, the plurality of grooves may be positioned along the length of the channel members with a pre-defined distance between the adjacent grooves.
[0019] The base portion further include a plurality of grid members. The plurality
of grid members are inserted through the grooves of the first channel member and
the second channel member. In an example, the plurality of grid members extends
perpendicularly with respect to the first channel member and the second channel
member. In an example, the position of the plurality of grooves along the length of
the first channel member is aligned with the position of the plurality of grooves of the
second channel member and are so shaped that it enables through insertion of
plurality of grid members. The plurality of grid members inserted through the grooves
of the channel members forms a grid of parallelly displaced grid members.
[0020] The grillage foundation may further include a plurality of inclined
members. The plurality of inclined members includes a first end and a second end. The plurality of inclined members extends orthogonally in upward direction from the first channel member and the second channel member. In an example, the second end of the plurality of inclined members is connected to the first channel member and the second channel member and the first end of the plurality of inclined members are converged to a common point to be connected with each other. In one example, the second end of a set of inclined members may be connected to the first channel member and the second end of another set of inclined members may be connected to the second channel member to form a polygon base structure, typically a rectangle with a space between the adjacent inclined members may act as a side surface of the structure.
[0021] The adjacent inclined members of the plurality of inclined members may
be coupled with each via a plurality of connecting members for connecting or coupling adjacent inclined members with each other. In an example, the plurality of connecting members include a set of diagonal connecting members coupling

adjacent inclined members diagonally and another set of lateral connecting members coupling adjacent inclined members laterally with each other. The diagonal connecting members and the lateral connecting members when coupled between the adjacent inclined members restricts relative motion of the adjacent inclined members with each other to reduce buckling of the inclined members.
[0022] As may be understood, once the transmission tower is erected using
above disclosed grillage foundation and subjected to external loads, the applied loads are transferred uniformly to the soil. For example, initially on application of applied loads, the same is equally distributed in the plurality of inclined members from the first end. Thereafter, the equally distributed load from inclined members is transferred to the channel member, which is being uniformly distributed in the plurality of grid members and then finally transferred to the bottom surface of the trench.
[0023] The above aspects are further described in conjunction with the FIGS. 1-
6, and in associated description below. It should be noted that the description and figures merely illustrate principles of the present subject matter. Therefore, various assembly that encompass the principles of the present subject matter, although not explicitly described or shown herein, may be devised from the description and are included within its scope.
[0024] FIG. 1 illustrates a perspective view of a grillage foundation 100, in
accordance with one implementation of the present subject matter. The grillage foundation 100 is to support a structure, such as transmission tower, (not shown in FIG. 1) of a power transmission system. The grillage foundation 100 includes a base portion 102. In an example, the base portion 102 is a quadrilateral, such as square or rectangle, to be placed on a bottom surface of a trench excavated at the site where the superstructure needs to be erected. The base portion 102 further includes a first channel member 104-1 and a second channel member 104-2. The first channel member 104-1 and the second channel member 104-2 are to be placed parallelly

and spaced apart on the bottom surface of the trench to form the base portion 102. An example structure of the first channel member 104-1 and the second channel member 104-2 is a C-shaped beam including a pair of lateral flat surfaces and a connecting surface extended longitudinally from one of the ends of the lateral flat surfaces between the pair of lateral flat surfaces.
[0025] Each of the first channel member 104-1 and the second channel member
104-2 further include a plurality of grooves 106-1, 2, …, N (referred to as grooves
106) positioned along their length. In an example, the grooves 106 may be
positioned along the longitudinally extending connecting surface of the first channel
member 104-1 and the second channel member 104-2 with a pre-defined distance
between the adjacent grooves. In one example, the C-shaped first channel member
104-1 and second channel member 104-2 is to be placed on the bottom surface of
the trench in such a manner that one of the lateral flat surfaces of the C-shaped
channel members comes in contact with the bottom surface of the trench.
[0026] Continuing further, the base portion 102 may further include a plurality of
grid members 108-1, 2, 3, …, N (referred to as grid members 108). In one example, the grid members 108 extends perpendicularly with respect to the first channel member 104-1 and the second channel member 104-2. In an example, the grid members 108 includes a set of L-shaped beam and another set of T-shaped beams. The L-shaped beam comprises a short surface and a long surface connected with the short surface and the T-shaped beam includes a lateral flat surface and a shaft surface extending from the middle of the lateral flat surface. The grid members 108 are inserted through the grooves 106 of the first channel member 104-1 and the second channel member 104-2. The grid members 108 on insertion through the grooves 106 of the first channel member 104-1 and the second channel member 104-2 forms a grid 110 of parallelly displaced grid members 108. In another example, the T-shaped beams may be formed by placing 2 L-shaped beams back to back for

each T-shaped groove in the first channel member 104-1 and the second channel member 104-2.
[0027] Continuing with the present example, the grillage foundation 100 further
includes plurality of inclined members 112-1, 2, 3, and 4 (referred to as inclined members 112) extending orthogonally from the first channel member 104-1 and the second channel member 104-2. It may be noted that the number of inclined members 112, i.e., 4, as depicted in FIG. 1 is just an example and any number of inclined members 112 may be used without deviating from the scope of the invention. The orthogonally extending inclined members 112 further includes a first end 114 and a second end 116. The first end 114 of each of the inclined members 112 may be converged to a common point 118 to be connected with each other, with the second end 116 being connected to the first channel member 104-1 and the second channel member 104-2. In one example, the second end 116 of a set of inclined members (for e.g., 112-1, 112-2 as depicted in FIG.1) may be connected to the first channel member 104-1 and the second end 116 of another set of inclined members (for e.g., 112-3 and 112-4 as depicted in FIG. 2) may be connected to the second channel member 104-2 to form a four-sided base upright structure with a space between the adjacent inclined members 112 may act as a side surface of the structure.
[0028] Each of the orthogonally extending inclined member 112 may be coupled
with adjacent inclined members 112 using a plurality of connecting members 120-1, 2, …, N (referred to as connecting members 120). The connecting members 120 when coupled between adjacent inclined members 112 restricts relative motion of the adjacent inclined members 112 with each other to reduce buckling of the inclined members 112. In an example, the connecting members 120 include a set of diagonal connecting members coupling adjacent inclined members 112 diagonally and another set of lateral connecting members coupling adjacent inclined members 112 laterally with each other.

[0029] The design and structural features of the grillage foundation 100 as just
described is exemplary only, and the subject matter may use additional elements or
members for strengthening the structure of the grillage foundation 100. For example,
the length and angle of inclination of inclined members 112, channel members 104,
grid members 108 and connecting members 120 may be determined based on the
bearing capacity of the soil for design in compression and the Soil density for design
in Uplift. Although FIG. 1 depicts only one grillage foundation 100 for the
transmission tower, the number of foundations for the transmission tower will be for all the four legs.
[0030] FIG. 2 illustrates a top view and side view of the base portion 102 of the
grillage foundation to be installed to support a superstructure, in accordance with an example of the present subject matter. The base portion 102 includes pair of channel members, i.e., first channel member 104-1 and second channel member 104-2, and plurality of grid members, such as grid members 108. In an example, the first channel member 104-1 and the second channel member 104-2, having a plurality of grooves, such as grooves 106, may be placed parallelly and spaced apart. In an example, the grid members 108, when inserted through the grooves 106 of the channel members may extend perpendicularly with respect to the first channel member 104-1 and the second channel member 104-2.
[0031] The grooves 106 provided along the length of each of the first channel
member 104-1 and the second channel member 104-2 may be positioned in such a manner that there is an alignment or synchronization between the grooves 106 of the first channel member 104-1 and the second channel member 104-2. When the grid members 108 inserted through these aligned grooves 106 of the first channel member 104-1 and the second channel member 104-2, forms grid 110 of back to back placed plurality of grid members 108. In an example, the grooves 106 may be so shaped that it enables through insertion of grid members 108. In one example, the grid 110 formed by inserting grid members 108 through the grooves 106 of the

first channel member 104-1 and the second channel member 104-2 includes L-shaped grid members 108 at distal ends 202 of the base portion 102 and T-shaped grid members 108 in between the distal ends 202.
[0032] It may be noted that, there may be number of possible sides from where
the grillage foundation 100 may be viewed to clearly see dimensional and orientational variation of different elements of the grillage foundation 100. Example views may include, but may not be limited to, view from A-A cross-section, view from B-B cross-section, view from C-C cross-section, and view from D-D cross-section. On assuming view from A-A cross-section as front view, view from B-B cross section may be the right view of the grillage foundation 100, view from C-C cross-section may be the back view of the grillage foundation 100, and view from D-D cross-section may be the left view of the grillage foundation 100.
[0033] FIG. 2 further depicts a view of base portion 102 when viewed from side
E. As depicted in view from side E, the base portion 102 includes C-shaped first channel member 104-1 and second channel member 104-2. In an example, an opening 204 of the first channel member 104-1 and an opening 206 of the second channel member 104-2 may face each other. However, other orientations of the channel members are also possible without deviating from the scope of the present subject matter. As may be understood from above, the base portion 102 includes plurality of grid members, such as grid members 108, but from side E, only grid member 108-1 is visible.
[0034] FIG. 3-4 illustrates different views of the grillage foundation 100, as per
an example. For example, FIG. 3A-3B depicts a front view (view from A-A cross section as depicted in FIG. 2) and a back view (view from C-C cross-section), respectively of the grillage foundation 100, whereas FIG. 4A-4B depicts a left side view (view from D-D cross-section) and a right-side view (view from B-B cross-section), respectively of the grillage foundation 100. The grillage foundation 100 includes first channel member 104-1 and second member 104-2 placed parallelly

and spaced apart. As described above, the first channel member 104-1 and the second channel member 104-2 may be a C-shaped beam with an upper lateral flat surface 302 and a lower lateral flat surface 304. One of the ends of the upper lateral flat surface 302 and the lower lateral flat surface 304 may be connected via the connecting surface. In one example, the C-shaped first channel member 104-1 and second channel member 104-2 is to be placed on the bottom surface of a trench (excavated at the site where a superstructure needs to be erected) in such a manner that one of the lateral flat surfaces of the C-shaped channel members comes in contact with the bottom surface of the trench. For example, as depicted in FIG. 3 and FIG. 4, lower lateral flat surface 304 touches or comes in contact with the bottom surface of the trench.
[0035] The connecting surface of the first channel member 104-1 and the second
channel member 104-2 may further include plurality of grooves, such as grooves 106 (not shown in FIG. 3-4) having a certain type of shape which enable insertion of plurality of grid members, such as grid members 108 through them to form the grid 110. In one example, the grid 110 formed by inserting grid members 108 through the grooves 106 of the first channel member 104-1 and the second channel member 104-2 includes L-shaped grid members 108 at distal ends 202 of the base portion 102 and T-shaped grid members 108 in between the distal ends 202. In an example, the L-shaped grid members 108 and the T-shaped grid members 108 are inserted through the grooves 106 in such a manner that the short surface of the L-shaped grid members 108 and the lateral flat surface of the T-shaped grid members 108 comes in contact with the bottom surface of the trench. For example, the L-shaped grid members 108 is placed in the standing position and the T-shaped grid members 108 is placed in an inverted T position. In another example, the T-shaped beams may be formed by placing 2 L-shaped beams back to back for each T-shaped groove in the first channel member 104-1 and the second channel member 104-2.

[0036] Such positioning of grid members 108 provides a maximum contact
surface with reduced foundation size to transfer maximum load or force acted on the foundation uniformly to the soil. Such inclusion of inverted T-shaped grid members 108 further reduces the cost of cutting grooves 106 on the first channel member 104-1 and the second channel member 104-2 as conventional L-shaped grooves require higher number of cuts to be formed on the channel members as compared to the T-shaped grooves.
[0037] As further depicted in FIG. 3-4, the grillage foundation 100 may further
include plurality of inclined members, such as inclined members 112, having first end 114 and the second end 116, which may extend orthogonally from the first channel member 104-1 and the second channel member 104-2. The first end 114 of each of the inclined members 112 may be converged to the common point 118 to be connected with each other, with the second end 116 being connected to the first channel member 104-1 and the second channel member 104-2. In one example, the second end 116 of a set of inclined members (for e.g., 112-1, 112-2 as depicted in FIG.4A-4B) may be connected to the first channel member 104-1 and the second end 116 of another set of inclined members (for e.g., 112-3 and 112-4 as depicted in FIG. 4A-4B) may be connected to the second channel member 104-2 to form a four-sided base upright structure with a space between the adjacent inclined members 112 may act as a side surface of the structure.
[0038] Although four inclined members 112 are depicted, the grillage foundation
100 may include any number of inclined members 112. As a result of that, the base of the structure formed by converging inclined members 112 may be any polygon including any quadrilateral which is one of a square, a rectangle, a rhombus, or any other parallelograms based on the requirement. In one example, the point at which the second end 116 of the inclined members 112 are connected to the first channel member 104-1 and the second channel member 104-2 may be identified based on the approximate load which is subjected on the grillage foundation 100 of the

transmission tower and also on the soil strength related factors as well. Further, the angle of inclination of the inclined members 112 may also be determined based on the inclination angle of the legs of the transmission tower to efficiently and stably support the transmission tower.
[0039] Further, as depicted in FIG. 3-4, each of the inclined members 112 of the
grillage foundation 100 may be coupled to the adjacent inclined members 112 using plurality of connecting members, such as connecting members 120 to restrict relative motion of the adjacent incline members to reduce buckling of the inclined members 112. In an example, the connecting members 120 include a set of diagonal connecting members 404 coupling adjacent inclined members 112 diagonally and another set of lateral connecting members 402 coupling adjacent inclined members 112 laterally with each other. Further, the angle of inclination of diagonal connecting members 120 may be determined in such a manner that they reduce buckling of the inclined members 112 on application of external loads, i.e., connecting members 120 restricts relative motion of the adjacent inclined members 112.
[0040] FIG. 5 illustrates a front view of an example grillage foundation installed
to support a superstructure, such as a transmission tower, in accordance with an example of the present subject matter. While erecting the transmission tower 502 on a site, a grillage foundation, such as grillage foundation 100, is installed for each leg of the transmission tower 502 beneath earth surface 504. As explained above, initially a trench 506 is excavated beneath the earth surface 504 for each leg of the transmission tower 502. Each excavated trench has desired height and width to accommodate the grillage foundation 100. Once trench is excavated, the shop-fabricated grillage foundation 100 is placed in the trench 506 and the common point 118 of each of the grillage foundation 100 is accordingly attached or engaged with the corresponding legs of the transmission tower 502. Once each leg of the transmission tower 502 is supported by the grillage foundation 100, the transmission tower 502 is capable of resisting the designed external loads or forces.

[0041] For example, if the transmission tower 502 is acted upon by any
compression load, the load is transferred to the grillage foundation 100 and then to the soil on which the grillage foundation 100 is placed through each legs of the transmission tower 502. During such transfer of loads, firstly, the load is uniformly distributed among the inclined members 112 of the grillage foundation 100 without disrupting stability of the inclined members 112. In an example, the connecting members 120 connected to the adjacent inclined members 112 restricts relative motion of the adjacent inclined members 112 to reduce buckling of inclined members 104. Thereafter, the load is further transferred to channel members 104, which in turn uniformly distributed amongst the plurality of grid members 108. Such uniform distribution of load or force into the grid members 108 ensures uniform distribution of load to the base soil. It may be noted that, in present subject matter, the larger contact surface provided by the inverted T-shaped grid 110 which may, in one case, may be formed by placing back to back L-shaped members, is utilized to uniformly distributing the applied load. Similarly, the uplift forces are resisted by the inverted earth frustum which is initiated from the bottom of the base portion 102 and the bending moment due to the side thrusts both in the transverse and longitudinal directions are converted into equal axial forces and grid members are designed accordingly.
[0042] FIG. 6 illustrates a method 600 to be implemented to manufacture a
grillage foundation, such as grillage foundation 100, for supporting a structure, such
as transmission tower 502, as per an example of the present subject matter. The
order in which the above-mentioned method is described is not intended to be
construed as a limitation, and some of the described method blocks may be
combined in a different order to implement the method, or alternative method.
[0043] Furthermore, the above-mentioned method may be implemented in a
suitable hardware, computer-readable instructions, or combination thereof. The steps of such method may be performed by either a system under the instruction of

machine executable instructions stored on a non-transitory computer readable
medium or by dedicated hardware circuits, microcontrollers, or logic circuits.
[0044] At block 602, a first channel member and a second channel member
including a plurality of grooves positioned along its length is placed parallelly and spaced apart on a surface. For example, initially, the first channel member 104-1 and the second channel member 104-2 are placed parallelly and spaced apart. Example structure of the first channel member 104-1 and the second channel member 104-2 is an C-shaped beam including a pair of lateral flat surfaces and a connecting surface connecting one of the ends of the lateral flat surface with each other. Each of the first channel member 104-1 and the second channel member 104-2 further include grooves 106 positioned along their length. In an example, the grooves 106 may be positioned along the longitudinally extending connecting surface of the first channel member 104-1 and the second channel member 104-2 with a pre-defined distance between the adjacent grooves. In one example, the C-shaped first channel member 104-1 and second channel member 104-2 is to be placed on the bottom surface of the trench in such a manner that one of the lateral flat surfaces of the C-shaped channel members comes in contact with the bottom surface of the trench.
[0045] At block 604, a plurality of grid members are inserted through the grooves
of the first channel member and the second channel member to form a grid of parallelly displaced grid members. For example, once the first channel member 104-1 and the second channel member 104-2 are placed on the bottom surface of the trench, grid members 108 are inserted through the grooves 106 of the first channel member 104-1 and the second channel member 104-2 to form the grid 110 of parallelly displaced grid members 108. In an example, the grid members 108 includes a set of L-shaped beam and another set of T-shaped beams. In an example, the position of the grooves 106 along the length of the first channel member 104-1 is aligned with the position of the grooves 106 of the second channel member 104-

2 and are so shaped that it enables through insertion of grid members 108. In another example, the T-shaped beams may be formed by placing 2 L-shaped beams back to back for each T-shaped groove in the first channel member 104-1 and the second channel member 104-2.
[0046] In one example, the grid 110 includes L-shaped grid members 108 at
distal ends 202 of the base portion 102 and T-shaped grid members 108 in between the distal ends 202. In an example, the L-shaped grid members 108 and the T-shaped grid members 108 are inserted through the grooves 106 in such a manner that the short surface of the L-shaped grid members 108 and the lateral surface of the T-shaped grid members 108 comes in contact with the bottom surface of the trench.
[0047] At block 606, a plurality of inclined members including a first end and a
second end are connected to the first channel member and the second channel member to form a polygon sided base structure. For example, the inclined members 112 including the first end 114 and the second end 116 extends orthogonally in upward direction from the first channel member 104-1 and the second channel member 104-2. In an example, the second end 116 of the inclined members 112 is connected to the first channel member 104-1 and the second channel member 104-2 and the first end 114 of the inclined members 112 are converged to the common point 118 to be connected with each other. In one example, the second end 116 of a set of inclined members (for e.g., 112-1, 112-2) may be connected to the first channel member 104-1 and the second end 116 of another set of inclined members (for e.g., 112-3 and 112-4) may be connected to the second channel member 104-2 to form a four-sided base structure with a space between the adjacent inclined members 112 acting as a side surface of the structure. In one example, the inclined members 112 may be connected to the channel members (104-1, 104-2) using nuts and bolts.

[0048] At block 608, a plurality of connecting members are connected between
the adjacent inclined members to couple the adjacent inclined members for restricting the relative motion of the adjacent inclined members. For example, connecting members 120 are coupled between the adjacent inclined members 112 to restrict the relative motion of the adjacent inclined members 112. In an example, the connecting members 120 include a set of diagonal connecting members coupling adjacent inclined members 112 diagonally and another set of lateral connecting members coupling adjacent inclined members 112 laterally with each other. The connecting members 120 when coupled restricts relative motion of the adjacent inclined members 112 with each other to reduce buckling of the inclined members 112.
[0049] Once the grillage foundation 100 is manufactured, it is transported to the
desired location where a transmission structure, such as the transmission tower 502, needs to be erected. Initially, the trench 506 is excavated beneath the earth surface 504 for each leg of the transmission tower 502. Each excavated trench has desired height and width to accommodate the grillage foundation 100. Once trench 506 is excavated, the shop-fabricated grillage foundation 100 is placed in the trench 506 and the common point 118 of each of the grillage foundation 100 is attached to the corresponding legs of the transmission tower 502. Once each leg of the transmission tower 502 is supported by the grillage foundation 100, the transmission tower 502 is capable of resisting the designed external loads or forces.
[0050] Although examples for the present disclosure have been described in
language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed and explained as examples of the present disclosure.

I/We Claim:
1. A grillage foundation for supporting a structure, the grillage foundation
comprising:
a base portion comprising:
a first channel member and a second channel member are to be placed
parallelly and spaced apart on a bottom surface of a trench, wherein the first
channel member and the second channel member each comprise a plurality of
grooves positioned along its length;
a plurality of grid members inserted through the grooves of the first
channel member and the second channel member forming a grid of parallelly
displaced grid members;
a plurality of inclined members comprising a first end and a second end, wherein the inclined members extend orthogonally upward from the first channel member and the second channel member, wherein the first end of the plurality of inclined members converge to a common point to be connected with each other and the second end is connected to the channel members; and
a plurality of connecting members for connecting adjacent inclined members.
2. The grillage foundation as claimed in claim 1, wherein the plurality of grid members extends perpendicularly with respect to the channel members.
3. The grillage foundation as claimed in claim 1, wherein the channel member is an C-shaped beam comprising a pair of lateral flat surface and a connecting surface extended between the pair of lateral flat surface.
4. The grillage foundation as claimed in claim 1, wherein the grid members comprises a set of L-shaped beam and another set of T-shaped beam, wherein the L-shaped beam comprises a short surface and a long surface and the T-shaped

beam comprises a lateral flat surface and a connecting surface extending from middle of the lateral flat surface, wherein the T-shaped beam is formed by placing L-shaped beams back to back.
5. The grillage foundation as claimed in claim 4, wherein the grid formed by inserting plurality of grid members through the grooves of the channel members comprises the L-shaped grid members at distal ends of the base portion and T-shaped grid members in between the distal ends, wherein the T-shaped grid members are formed by placing L-shaped beams back to back.
6. The grillage foundation as claimed in claim 3 and 4, wherein the lateral flat surface of the C-shaped channel members, short leg of the L-shaped grid members and the lateral flat surface of T-shaped grid members are to be placed in contact with the bottom surface of the trench.
7. The grillage foundation as claimed in claim 1, wherein the second end of the inclined members connected to the channel member forms a four-sided base structure with a space between adjacent inclined members acting as a side surface of the structure.
8. The grillage foundation as claimed in claim 1, wherein the connecting members comprises a set of diagonal connecting members and another set of lateral connecting members, wherein the connecting members restricts relative motion of the adjacent inclined members to reduce buckling.
9. The grillage foundation as claimed in claim 1, wherein the grooves of the first channel member are aligned with the grooves of the second channel member and are shaped to enable through-insertion of the grid members.

10. A method of manufacturing a grillage foundation for supporting a structure, wherein the method comprises:
placing a first channel member and a second channel member parallelly and spaced apart on a surface, wherein the first channel member and the second channel member each comprise a plurality of grooves positioned along its length;
inserting a plurality of grid members through the grooves of the first channel member and the second member to form a grid of parallelly spaced grid members;
connecting a plurality of inclined members comprising a first end and a second end to the first channel member and the second channel member forming a four-sided base structure with a space between the adjacent inclined members acting as a side surface of the structure, wherein the first end of the plurality of inclined members converge to a common point to be connected with each other and the second end is connected to the channel members;
coupling adjacent inclined members with each other via a plurality of connecting members to restrict relative motion of the adjacent inclined members, wherein the connecting members comprises a set of diagonal connecting members and another set of lateral connecting members.