FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
MANUAL DRIVEN HELICAL PILE FOUNDATION;
GTL LTD, A COMPANY INCORPORATED UNDER THE LAWS OF INDIA WHOSE ADDRESS IS GLOBAL VISION , ES-II, MIDC, TTC INDUSTRIAL AREA , MAHAPE, NAVI MUMBAI -400 710, MAHARASHTRA, INDIA
THE FOLLOWING SPECIFICATION
PARTICULARLY DESCRIBES THE
INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF THE INVENTION
The present invention relates to a helical pile foundation, more specifically to a manual driven helical pile foundation.
BACKGROUND OF THE INVENTION
In the construction industry, soil mechanics is a important consideration. According to the nature and the bearing capacity of the soil; the foundation of a building/structure is selected.
Spread foundations such as footing or raft are used if the soil has adequate bearing capacity; and piles are used if the soil has inadequate bearing capacity.
Piles or piers transfer the load from a weak upper soil layer to a strong layer which is the deeper layer of the soil, thereby increasing the bearing capacity of the soil and the foundation to withstand applied load. This phenomenon is highly dependent on the structure and configuration of the screw pile.
The conventionally available screw piles consists of a central shaft-essentially round or square shaped with helical blade arranged on them in different configurations with its axis positioned parallel to the shaft's length,

In a conventional method to install a pile; the soil is excavated prior to driving the pile either manually or using machines, and the walls of the excavated area is protected using wooden or bamboo shoring. To make the surface firm it is de-watered till the surface is coated with PCC; and then a steel skeleton is inserted. But due to regular bearing and friction piles the side walls of the bore may collapse and the pile may not be installed.
the pile is driven in the excavated area. The time and effort employed in this method is on the higher side.
In another method to install a screw pile 2-3 people using different pile driving mechanisms like excavator or diesel/hydraulic hammer or hydraulic press-in or piling rigs weighing around 5-45 tonnes are used. Depending on the ground conditions/ pile size and depth a pile can be installed in a few hours.
Though the installation time is a matter of few hours, the time and cost factor involved to transport the drive machinery such as the excavator to the site of installation is high.
Further special provisions will have to be made to store the driving machinery and other working tools at the site of installation.

Hence there is a need for a screw pile which is structurally stable and doesn't need heavy driving machinery to be transported to the site to install a screw pile.
BRIEF DESCRIPTION OF THE DRAWINGS
Reference will be made to embodiments of the invention, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Fig.l shows a helical pile foundation as per one embodiment of the invention.
Fig.2 shows a helical pile foundation as per another
embodiment of the invention.
Those skilled in the art will appreciate that the diagram is merely illustrative; and the scope of the invention may not be limited to the size and configuration illustrated.
The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description.

DETAILED DESCRIPTION OF THE INVENTION
The embodiments herein provide a method and system for helical pile foundation. The method of the invention may also be implemented as application performed by a stand alone or embedded system.
The invention described herein is explained using specific exemplary details for better understanding. However, the invention disclosed can be worked on by a person skilled in the art without the use of these specific details.
References in the specification to w one embodiment" or " an embodiment" means that a particular feature, structure, characteristic, or function described in connection with the embodiment is included in at lest one embodiment of the invention. The appearances of the phrase vvin one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
Hereinafter, the preferred embodiments of the present invention will be described in detail.. For clear description of the present invention, known constructions and functions will be omitted.
Fig. 1 shows a manual hand driven helical pile foundation. The helical pile foundation is a conical shaped pre-casted segmented structure which may be assembled at the site of installation.

The manual hand driven helical pile foundation comprises of an elongated shaft member which is a segemented structure further comprising of a plurality of segments(102) defining a longitudinal axis with a radially extending load bearing member. The load bearing member is a helix blade(104), and is integral with the shaft member projecting outwardly from the longitudinal axis of shaft member.
The manual hand driven helical pile foundation; by way of example and not to limit the scope of the invention comprises of five segments, wherein the first segment is at the leading end; and the fifth segment at the trailing end. ' The segments structurally are tubular in shape with fins fabricated at the periphery of the segments, These segments are coupled to each other by threadably fastening them and bolting them at the periphery of the segments. The slots for bolting are configured on the fins at the periphery of the segments. The fins at the periphery of the segment effect better transfer of force, provides stability and also prevent the coupling threads from damage. The diameter of these segments along the pile increases. gradually from the leading end to the trailing end to provide a conical shape to the pile.

The first segment at the leading end of the helical pile bears a helix blade and a cone which is welded at its leading end; and of the segment has a means to receive the second segment at its trailing end. The diameter of the first segment is the least compared to the other segments.
The second segment is coupled and engaged to the first segment at its leading end and has a means to receive the third segment at its trailing end. The diameter of the segment varies incrementally from leading peripheral end of the segment to the trailing peripheral end of the segment so as to accommodate the following segment to the preceding segment. The segments essentially have a trailing peripheral end diameter which is more compared to the preceding segment trailing peripheral end diameter and is equal compared to the following segment's leading peripheral end diameter, and hence to accommodate these segments with varying diameters the segments are fabricated as tapered segments and thus the segments have to be coupled in a iterative order.
Similarly the remaining segments are coupled to the preceding segments and thus the screw pile increases in diameter gradually giving the pile a conical shaped configuration..

These segments are brought separately to the site of installation; and coupled during the installation of the pile.
The manual hand driven helical pile foundation is installed using a tripod stand arrangement. At the site of installation a layout marking is done to place the tripod stand to ensure and create a benchmark to create 90° angle for reference along with water tube level. The first segment is then placed in position and driven into the soil by rotating the segment manually.
Once the first segment is driven into the soil to required depth in the soil; the second segment is coupled by threading and bolting onto the first segment and driven into the soil to required depth. This helps preventing the load from getting transferred on to the threaded portion of the coupling, preventing the coupling to last for a longer duration of time. The same procedure is repeated for driving the remaining segments of the pile to required depth.
The structural configuration of the present invention exerts a pressure on the cone and helix head which cuts into the soil and the pile is driven into the soil. Further the conical structure of the pile allows the force applied at the trailing end of the pile to be effectively transferred from segment to segment, converging the applied force to the leading end of the

pile which is the point of inertia lying along the axis of rotation. Thus the screw pile according to the present invention, requires less force and/or less torque to drive the pile compared to the existing piles. Further the fins at the periphery of the segments and the conical configuration of the pile provides better stability.
Fig.2 shows a manual hand driven helical pile foundation wherein the helical load member extends till the tip of the cone at the first segment. Those skilled in the art will appreciate that the pile illustrated in fig. 2 has the same structural features as illustrated in fig.l.
The manual hand driven helical pile according to the present invention may be based on the following principle:
Ultimate compression capacity (kN)
Qc =Qhelix +Qbearing + Qshaft
Qhelix = 0.5 x x Da x y' x (H32-H12) x Ks x tan $ = 20.56kN
Qbearing = y' x H x Ah x Nq ~ 169.38 kN
Qshaft = 0.5 x Ps x Heff2 x y' x Ks x tanΦ = 26.36kN
Qc = 216.72kN
Safe allowable load carrying capacity of screw pile under compression - 216/ 2 = 105kN

EVALUATION OF UPLIFT CAPACITY Critical embedment ratio, (H/D)cr = 4 H/D = 6/0.5 =12 >4
Breakout factor for deep condition (Fq*) = 25 Uplift Coefficient (Ku) =0.9
For this case. Ultimate screw pile uplift capacity (Qt) = Qhelix
+ Qbearing +Qshaft Qhelix = 0.5 x x Da x y' x (H32-H12) x Ku x
tan 0 = 37 kN
Qbearing'« y' x H x Ah x Fq = 230.7 kN
Qshaft = 0.5 x Ps x Heff2 x y' x Ku x tan Φ= 47.44 kN Qt =315 kN
Safe allowable load carrying capacity of screw pile under tension
or uplift- 315/2 = 155 kN
The bearing capacity of the pile may be analyzed by Terzagi and Peck method,
The manual hand driven helical pile foundation can be implemented to a plurality of structures, sign boars, poles, towers, etc.
However the requirement of the no. of segments and the no. of piles required will be dependent on the structural load and size of the structure

In a preferred embodiment of the present invention the manual hand driven screw pile foundation may be implemented to a telecomm tower under following conditions: Load at the Pile CAP level Height of the Telecom tower =40M Design wind speed =180Kmph C/C spacing of the legs -5m
Total vertical downward load on each leg = 280KN(compressive) Total uplift load due to wind on each leg = 200KN (uplift) Moment acting at the base of the leg = 1296Kn SOIL DATA
Loose to Medium dense soil
Value of about 10 is considered for the design Effective unit weight of the soil = 7.7KN/M2 Coefficient of lateral each pressure (Ks) =0.5 Internal fractional angle of the soil =30 Dimensionless bearing factor{ Nq) =18 PILE DATA
Helix spacing (s)= 2D =2X 0.5 =1.0m Diameter of Helix (D)=0.5m Diameter of shaft {d)=0.25m Internal diameter of the shaft (di)=0.19m Average diameter of helix (Da)=0.5m Area of the bottom helix (Ah) =0.196m2 Diameter of shaft (d) =0.25m

Inner diameter of the shaft (di) = 0.24m
Thickness = 5 'ram
Number of Helix - 2
Diameter of Helix (D) =0.5m
Thickness of Helix - 5 mm
Depth to top helix (HI) =6.0m
Depth to bottom helix (H3) =7.0m
Embedment depth of pile (H) «6.0m
Total length of the pile below GL = 7.5m
Center to center spacing of piles = 1.5 in
With the above configuration for a preferred embodiment the pile may be manufactured by rolling a 5mm MS sheet as a circular tube with a diameter of 250mm and length of 2000mm with one end which may be welded along with a cone(The diameter of the cone at one end may be 250mm and other side will be pointed ) and a helix blade with thickness 5mm which may reduce to 4mm. The width of the helix 125mm as it may roll along with the circular tube of 250mm , than the outer diameter of the helix may be 500mm. The other side may have a threaded portion of up to 100 to 150mm (the threading will be external } . At the Threaded portion the wall thickness may be 3. 5mm thick of the MS Sheet. Just below the threaded portion L Shape flats(fins) may be welded with a projection of 80mm with a hole at centre.

It should be noted that the preferred embodiment is meant to be merely illustrative not limiting the scope of the invention.

WE CLAIM:
1. A manual hand driven screw pile comprises of:
a plurality of tubular segments which are coupled in a iterative
order to form a elongated shaft member;
atleast one radially extending load bearing member at the leading
segment of the screw pile; and
a cone at the leading end of the screw pile, wherein the diameter of screw pile increases gradually from the leading end to the trailing end of the screw pile.
2. A manual hand driven screw pile as claimed in claim 1, wherein the first segment bears the cone at the leading end; and a means to receive the second segment at its trailing end.
3. A manual hand driven screw pile as claimed in claim 1, wherein a trailing segment is coupled and engaged to the preceding segments at it leading end and has a receiving means to receive the trailing segment at its trailing end.
4. A manual hand driven screw pile as claimed in claim 1, wherein the configuration of the segment varies incrementally from the leading peripheral end of the segment to the trailing peripheral end of the segment.
5. A manual hand driven screw pile as claimed in claim 1, wherein the segments further comprise of fins fabricated at its periphery.

6. A manual hand driven screw pile as claimed in claim 1, wherein the segments are coupled by threadably engaging them and optionally bolting them at the fins fabricated at the periphery of the segments.
7. A manual hand driven screw pile as claimed in claim 1, wherein the radially extending load bea-ring member at the first segment is a helical blade.
8. A manual hand driven screw pile as claimed in claim 1 and 5, wherein the helical blade at the first segment extends till the leading end of the first segment.
9. A manual hand driven screw pile as claimed in claim 1 and 5, wherein the helical blade at the first segment extends till the tip of the cone at the leading end of the screw pile.

10. A manual hand driven screw pile as claimed in the above claims is a 5 segment structure.
11. A method to implement the manual hand driven screw pile comprises of steps of: creating a benchmark of 90° angle;
placing the first segment in driving position;
driving the first segment into the soil by rotating the segment
manually;
coupling the trailing segments driving the trailing segments one
after the other to effectively transfer force from segment to

segment, converging the applied force to the leading end of the pile.
12. A method to implement the manual hand driven screw pile as claimed in claim 12, wherein the segments are threadably coupled and optionally bolted at the fins.
13. A method to implement the manual hand driven screw pile as claimed in claim 12 uses a tripod chain-pulley arrangement to drive the screw pile.
14. A manual hand driven screw pile as claimed in the above claims is a conical shaped screw pile.