WO2015075748A2

WO2015075748A2 - Next generation traction advanced cantilever support (tracs) systems for single and multiple cantilever configurations for conventional tramway and tunnel ohe (focs and rocs)

Info

Publication number: WO2015075748A2
Application number: PCT/IN2014/000732
Authority: WO
Inventors: Ramakrishnan BALAMUKUNDAN; Nagarajan RAMAKRISHNAN
Original assignee: Balamukundan Ramakrishnan; Ramakrishnan Nagarajan
Priority date: 2013-11-22
Filing date: 2014-11-24
Publication date: 2015-05-28
Also published as: WO2015075748A3

Abstract

The invention relates to an advance cantilever support system for traction application of variety of configurations such as conventional type, tramway type of Overhead Equipment (OHE), Flexible Overhead Contact System, Rigid Overhead Contact System in open route and tunnels. The advanced cantilever support system fulfils all aspects of RAMS (Reliability, Availability, Maintainability and Safety).

Description

NEXT GENERATION TRACTION ADVANCED CANTILEVER SUPPORT (TRACS) SYSTEMS FOR SINGLE AND MULTIPLE CANTILEVER CONFIGURATIONS FOR CONVENTIONAL TRAMWAY AND TUNNEL OHE (FOCS AND ROCS)

Specification

TITLE OF THE INVENTION

Next Generation TRaction Advanced Cantilever Support - (TRACS) systems for Single, Multiple and Tunnel cantilever configurations for Conventional and Tramway Type Overhead Equipment (FOCS & ROCS)"

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims priority from the Provisional Specification No.2239/CHE/2013 dated 22.5.2013 for which the 12 months deadline to submit complete specification ended on - 22.5.2014. This deadline has been extended to 22.1 1.2014 by our post dating request filed in the office on 15.05.2014. Since 22.1 1.2014 falls on a Saturday, this complete specification is filed on the next working day i.e. 24.1 1.2014 and hence the application is filed in time.

FIELD OF THE INVENTION

[0002] The present invention relates to the field of Traction Overhead Equipment, i.e. FOCS (Flexible overhead contact system)& ROCS (Rigid overhead contact system) design and construction.

BACKGROUND OF THE INVENTION

[0003] The cantilever frames are designed to provide support to the contact wire and messenger wire at the required system height and to register the correct stagger of the wires relative to the track centre line.

[0004] The prior art of the cantilever supports for the FOCS / ROCS systems employ a polygonal type of construction using a set of GI / Aluminium tubes associated with a number of cast iron / forged steel / cast aluminium alloy / aluminium bronze castings / copper fittings / porcelain / composite insulators, stainless and GI fasteners. A typical arrangement drawing for cantilever assembly for conventional and tramway type Overhead Equipment(OHE) is attached (Figs 1 and 2 ) with the list of components indicated in the tables 1 and 2. This requires a large number of components involving huge cost and requiring large scale inventory. The more number of components also increases the probabilities of failures thus reducing the reliability index for the system.

[0005] Hence there is a need in the art to develop a cantilever support system with new design features that facilitates simplified mass production, operational efficiency and_^ versatile for application in different types of cantilever. The present inyention satisfies these needs, as well as others, and generally overcomes the deficiencies found in the background art.

OBJECTS OF THE INVENTION

[0006] It is a main object of the invention to develop a cantilever support system with less number of components.

[0007] It is another object of the invention to develop a cantilever support system that is more versatile for application in single and multiple cantilever configurations and improve the flexibility of installations.

[0008] It is yet another object of the invention to develop a cantilever support system that helps to reduce the inventory and cost of construction besides making the design of the system easy.

[0009] It is a further object of the invention to develop a cantilever support system that will suit FOCS arrangement in Tunnel.

[0010] Other objects of the inventions will be apparent from the description of the invention herein below.

SUMMARY OF THE INVENTION

[0011] The present invention relates to an advanced cantilever support system for traction application of variety of configurations such as conventional type, tramway type of Overhead Equipment (OHE). It works on the principle of a cantilever arrangement with one end supported on the traction structure and the load of the OHE carried at the other end.

[0012] The advanced cantilever support system fulfils all aspects of RAMS (Reliability, Availability, Maintainability and Safety)

[0013] The time to install and minimum time to restoration (MTTR) in the event of failures is absolutely less.

[0014] The reduced weight of the assembly reduces the bending moment considerably thus reducing the volume of foundation for the structures resulting in the reduced cost of the installations.

BRIEF DESCRIPTION OF THE DRAWINGS [0015] These and other features, aspects and advantages of the invention will become better understood when the following detailed description is read with reference to the accompanying drawings, wherein:

[0016] Figure 1 prior art -shows the Conventional type Single OHE.

[0017] Figure 2 prior art-shows the Tramway type Single OHE.

[0018] Figure 3 shows the present invention (universal TRACS) Single OFIE for Conventional and Tramway type.

[0019] Figure 4 shows the present invention (universal TRACS)Double OHE for Conventional and Tramway type.

[0020] Figure 5 shows the present invention (universal TRACS) Triple OHE for Conventional and Tramway type.

[0021] Figure 6 shows the Swivel Clip Adopter an important component of the present invention.

[0022] Figure 7 shows the present invention (tunnel TRACS) for Single OHE in tunnels.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO

DRAWINGS

In Open Route Sections:

[0023] The prior art of Single cantilever assemblies for the conventional and tramway type of OHE is shown in the Figures 1 and 2 respectively.

[0024] Conventional Type of Single OHE requires 30 components as shown in Figure 1 and the materials required for the same are listed in table below.

Table 1: Components for prior art Conventional type Single OHE

2403 Stay sleeve

¹

2130 Suspension bracket

¹

1160 Suspension clamp

¹

6030 Bracket insulator

¹

2160 Register arm hook

¹

2080 Bracket tube

¹

2360 Drop bracket

¹

2550 Antiwind clamp

¹

2177 Dropper clip 49 mm

¹

2422 Register arm eye piece

¹

2420 Register arm tube

¹

2423 Tube cap 25 mm

¹

2104 Tube cap 40 mm

¹

2461 RT dropper clip

¹

2391 BFB steady arm hook

¹

2544 BFB steady arm section

¹

2392 BFB steady arm swivel

¹

1220 Swivel clip

¹

1162 SS 'U' bolt for suspension clamp 2

6034 SS 'U' bolt for bracket insulator 2

2404 SS bolt for stay sleeve 2

105S SS bolt for stay insulator 2

2362 SS bolt for drop bracket 1

Bolt GI 16X60/40 mm with nut and locknut 2 30 Bolt GI 16X260.58 mm with nut and locknut 2

[0025] Figure 2 shows the prior art Tramway type Single OHE and the materials needed for the same are listed in table below.

Table 2: Components for prior art Tramway type Single OHE

18 2104 Tube cap 40 mm

¹

19 / 2461 RT dropper clip

¹

20 2391 BFB steady arm hook

¹

21 2544 BFB steady arm section

¹

22 2392 BFB steady arm swivel

¹

23 1220 Swivel clip

¹

24 1 162 SS 'LP bolt for suspension clamp 2

25 6034 SS 'LP bolt for bracket insulator 2

26 2404 SS bolt for stay sleeve 2

27 105S SS bolt for stay insulator 2

28 . 2362 SS bolt for drop bracket 1

29 Bolt GI 16X60/40 mm with nut and locknut 2

30 Bolt GI 16X260.58 mm with nut and locknut 2

[0026] The prior art of Double cantilever assemblies for the conventional and tramway type of OHE require additional small part steel ( SPS), i.e. Multiple Cantilever Cross Arm (MCC) mounted on the structures with backing angles using GI fasteners. Two single cantilever assemblies are erected. Thus the number of items / components required for the arrangement will be increased to 33 in each case.

[0027] The present invention eliminates the need for MCC assembly and combines as many as three OHE supports in one cantilever assembly, as detailed in the Figures 3, 4 and 5. The number of components required in the arrangement for supporting Single, Double and Triple OHEs is only 10, 10 & 1 1 respectively as shown in Figures 3, 4 and 5 respectively.

Table 3: Components for the present invention Single OHE for Conventional and

Tramway type Component No. RI No. Description Qty

1 6020 Insulator 2

2 - Hollow rectangular section

¹

3 - 20 mm rope stay

¹

4 - Top and bottom fittings

5 - Swivel clip adopter

¹

6 1220 Swivel clip

¹

7 - Stay rope clamp assembly

¹

8 - Messenger wire clamp

¹

9 - Bracket section eye piece

¹

10 - Bracket section cap

¹

Table 4: Components for the present invention Double OHE for Conventional and

Tramway type

Table 5: Components for the present invention Triple OHE for Conventional and Tramway type

[0028] The important component of the three OHE supports namely the Swivel Clip Adopter (Figure 6) comprises of the components given in the table below:

Table6: Components of the Swivel Clip Adopter

Component No. Description

1 Tube 33.7 mm nominal bore 3 mm wall thickness

2 Coil spring radius 25 mm & length 200 mm

3 Bolt GI 16X150/35mm

4 Insulator attachment (GI)

5 Cover plate

6 Square plate flange for tube

In tunnels: [0029] The present invention is more suitable in tunnels, especially where restrictions of electrical clearances are of major concern. In view of these restrictions, in the prior art, mostly ROCS type of construction is employed, with cantilever supports at intervals of about 8 to 10 m.

[0030] The present invention also makes it possible to reduce the number of supports to almost 1/3 of the prior art system by adopting spans of about 30 m, resulting in considerable cost reduction. Figure 7 shows the present invention Single OHE in tunnels.

Table 7: Components for the present invention Single OHE in tunnels

[0031] The present invention also makes it possible to install the Regulated FOCS type of system which is considered more efficient for high speed operations.

[0032] All aspects of RAMS requirement are fulfilled in the present invention. Reliability factor is increased as less number of components is used. Use of hot dip galvanised hollow rectangular section reduces the effects of corrosion as compared to the tubes currently in use in the prior art. This also reduces the periodicity of replacement of the cantilevers, as the life of the fittings is increased.

Availability of the components is ensured as all the components are made out of indigenous materials only.

[0033] In view of the use of minimum number of components, the method for erection, adjustments and replacements are made very easy and it is easy to maintain.

[0034] Safety factor is also improved as the live parts of the conductors are kept away from the structure and due to the fact that small and fragile components have been eliminated.

Method of Implementation of the Present Invention

[0035] The components of the new arrangement are made of steel sections and tubes that are available indigenously. The configuration of the cantilever assemblies are designed on the basis of the Layout Plan for OHE, duly taking into consideration the parameters such as Implantation (Setting distance of the structures), the stagger of the messenger wire and contact wire and the height of the contact wire.

Procedure for implementation

[0036] The following procedure is followed for implementation of the present invention.

Tests to be carried out before implementation

1. Design validation for the sections and components.

Cantilever assembly is designed for individual locations based on the setting distance and stagger of the conductors relative to the centre line of the track.

Cantilevers are also designed to carry one, two or three OHE supports depending on the locations.

The cross section of the hollow rectangular section is decided on the basis of various loads, such as dead weight of OHE, radial tension and wind loads, acting on the cantilever at predetermined distances.

Accordingly the cross section of the rectangular hollow section for single, double and three cantilever configurations are designed as 50X75mm, 50X100mm and 50/150mm respectively.

The capacity of the components to withstand these loads with a factor of safety as prescribed by regulations, are ascertained by calculations and the design parameters are concluded. The above activity is termed the design validation.

2. Testing of the assembly and components.

a. Type tests on the main components listed below.

i. The hollow rectangular sections.

ii. The swivel clip adopter.

iii. The composite / porcelain insulator with its end fittings.

b. Type tests are conducted to ensure the chemical and physical properties of the steel materials as required by the governing Specifications.

c. Endurance test for the swivel clip adopters in addition to the physical and chemical properties of the components such as spring, the tubes and the welded components.

d. The insulators are tested for its capacity to withstand tensile and torsion loads, as per design values.

e. Load tests carried out on the cantilever assembly at the site for different configurations 3. Field trials.

a. Goods yards. — One track.

b. Loop lines. — One loop line tension length including turnouts.

c. Main lines. ~ Two tension lengths including IOL and UIOL

d. Sub-urban lines.— Two tension lengths including IOL and UIOL

e. Metro elevated lines. ~ Two tension lengths including IOL and UIOL

f. Metro tunnel section— One loop line with overlaps.

g. High speed sections.— Two tension lengths including IOL and UIOL

4. Documents required.

a. Design General Arrangement (GA) drawings.

b. Specifications for all components. (Part drawings)

c. Design drawings for specific locations as per LOP.

d. Detailed testing procedure for the components and assembly.

e. Formats for testing and commissioning.

f. Format for performance reports.

5. Performance assessment for the installations for final implementation in large sections, i. How it performs?

[0037] While in the design of cantilevers for conventional OHE, one cantilever will be proposed to carry only one OHE, in the present invention one cantilever can take more than one OHE as may be required at overlaps and turn-outs. It also makes it easy to profile the OHE under over line structures and adjustments at Insulated and Un-insulated overlaps.

Claims

CLAIMS We claim:

1. An improved traction advanced cantilever support system of single overhead equipment(OHE) for conventional and tramway type wherein the improvement is characterized by using only ten components for the system (figure 3) comprising insulator -(1), hollow rectangular section (2), rope stay (3), top and bottom fittings (4), swivel clip adopter

(5) , swivel clip (6), stay rope clamp assembly (7), messenger wire clamp (8), bracket section eye piece (9) and bracket section cap (10) wherein the insulator and top and bottom fittings required are two in number and the swivel clip adopter (figure 6) comprising tube (1), coil spring (2), bolt (3), insulator attachment (4), cover plate (5) and square plate flange for tube

(6) and whereby the improvement reduces the number of components than the current state of the art and thereby increasing the reliability, availability, maintainability and safety of the system.

2. An improved traction advanced cantilever support system of double overhead equipment(OHE) for conventional and tramway type wherein the improvement is characterized by using only ten components for the system(figure 4) comprising insulator(l), hollow rectangular section(2), rope stay(3), top and bottom fittings(4), swivel clip adopter(5), swivel clip(6), stay rope clamp assembly(7), messenger wire clamp(8), bracket section eye piece(9) and bracket section cap(10) wherein the insulator required is four , top and bottom fittings is two, swivel clip adopter is two and messenger wire clamp is two in number and the swivel clip adopter (figure 6) comprising tube(l), coil spring(2), bolt(3), insulator attachment(4), cover plate(5) and square plate flange for tube(6) and whereby the improvement reduces the number of components than the current state of the art and thereby increasing the reliability, availability, maintainability and safety of the system.

3. An improved traction advanced cantilever support system of triple overhead equipment(OHE) for conventional and tramway type wherein the improvement is characterized by eleven components for the system(figure 5) comprising insulator(l), hollow rectangular section(2), rope stay(3), top and bottom fittings(4), swivel clip adopter(5), swivel clip(6), stay rope clamp assembly(7), messenger wire clamp(8), bracket section eye piece(9),bracket section cap(10) and diagonal stay rod (11) wherein the insulator required is six, top and bottom fittings is two, swivel clip adopter is three, swivel clip is three, stay rope assembly is two and messenger wire clamp is three in number and the swivel clip adopter (figure 6) comprising tube(l), coil spring(2), bolt(3), insulator attachment(4), cover plate(5) and square plate flange for tube(6) and whereby the improvement reduces the number of components than the current state of the art and thereby increasing the reliability, availability, maintainability and safety of the system.

4. An improved traction advanced cantilever support system of single overhead equipment(OHE) in tunnels wherein the improvement is characterized by three components for the system (figure 7) comprising insulator (1), swivel clip adopter (2) and swivel clip (3) wherein the swivel clip adopter (figure 6) comprising tube(l), coil spring(2), bolt(3), insulator attachment(4), cover plate(5) and square plate flange for tube(6)and whereby the improvement reduces the number of components than the current state of the art in addition to increasing the span of supports from the current 10 m to 30 m and thereby increasing the reliability, availability, maintainability and safety of the system.