Modern Survey for KPTCL 220 KV Transmission Lines

8/10/2019 Modern Survey for KPTCL 220 KV Transmission Lines

1/27

03.03.2014

KARNATAKA POWER TRANSMISSION CORPORATIONLIMITED

TECHNICAL SPECIFICATIONS

FOR

DETAILED SURVEYING

By using Modern Survey Techniques

For 220 KV Transmission Lines


2/27

03.03.2014

CONTENTS______________________________________________________________________

Clause Description____________________________________________________________

1.0 General Information & Scope of Work

2.0 Route Alignment

3.0 Detailed Survey

4.0 Geotechnical Investigation

5.0 Statutory Regulations and Standards

___________________________________________________________


3/27

03.03.2014

TECHNICAL SPECIFICATIONS

FOR DETAILED SURVEY OF 220 KV TRANSMISSION LINES

1.0 General Information & Scope of Work

1.1 The technical specifications cover detailed survey including route alignment,profiling, tower spotting, contouring and soil investigation . The scope of work

inter-alia shall include the following:

a) Route alignment using satellite imageries of NRSA, Google images andSurvey of India maps, inter-alia including:

i. Identification of three alternative route alignments & selection ofoptimized route alignment in consultation with the owner. This shall bedone using low resolution satellite imageries of NRSA, Google images and Survey of India maps. The output shall be in the form of digitizedroute alignment drawing with latest topographical and otherdetails/features up to 5 kms . on either sides of selected route alignment(both in hard and soft copies).

ii. Digital terrain modeling along the selected route using contour data fromtopographical maps.

iii. Associated field work.

b) Detailed Survey using GPS, DGPS, Total Stations, long range scanners &Digital theodolites of reasonable accuracies or alternatively using ALTM,(Airborne Laser Terrain Modeling) techniques, inter-alia including:

i. Digitized profiling along the selected route along with plan details usingPower Line Systems Computer Aided Design and Drafting (PLS-CADD).

ii. Computer aided tower spotting & optimization.

iii Soil resisti it me s rement long the ro te


4/27

03.03.2014

f) Soil investigation along the selected route .

g) Preparation of Survey reports including estimation of Bill of Quantities,identification and explanation of route constraints, infrastructure detailsavailable enroute etc.

h) Soil resistivity tests along the selected route.

1.2 All the bidders shall present their proposed methodology for execution of thework as per specifications and details of the equipment and facilities includingsoft wares available with them, based on which the owner may issue suitableamendments. A pre bid conference if required shall also be held.

1.3 The Provisional quantities for the scope of work are indicated in relevant PriceSchedules of Bid Proposal Sheets. The final quantities for route alignment &detailed survey (quantities in "kms" unit) shall be the route length along the

approved route alignment. The route alignment, detailed survey, includingprofiling & tower spotting, contouring, soil investigation etc. shall be carried outby the Contractor as per the technical specifications stipulated herein.

1.4 The Contractor must note that the Owner shall not be responsible for loss ordamage to properties, trees etc. due to contractor's work during survey. TheContractor shall indemnify the Owner for any loss or damage to properties, treesetc. during the survey work

1.5 The Contractor should note that Owner will not furnish the NRSA satelliteimageries or topographical maps prepared by survey of India but will renderavailable assistance that may be required in obtaining these by providing lettersof recommendation to the concerned authorities. Further, in case the contractoropts for use of ALTM techniques for detailed survey, he shall be responsible forobtaining necessary clearance/ permission as may be required from concerned

authorities. The Owner will provide assistance that may be required in obtainingthese clearance/permissions by providing letters or recommendations to theconcerned authorities

1.6 The Bidders shall give along with their bid clause by clause commentaryindicating their confirmation/comments/observations in respect of all clauses of


5/27

03.03.2014

1.9 After carrying out the detailed survey and soil investigations, the contractor shall

estimate complete BOQ of the transmission lines and submit the same to theOwner.

1.10 No technical deviations what so ever to certain conditions of the biddingdocuments permitted by the owner and therefore, the bidders are advised thatwhile making bid proposals and quoting prices these conditions mayappropriately be taken into consideration.

The bidder shall complete all the schedules and annexures in the bid proposalsheets, technical data sheets specified elsewhere.

This specification covers detailed survey of 220 KV Transmission Line andhanding over of final survey report to KPTCL including complete data.

2.0 Route Alignment

2.1 Route Alignment shall be done using satellite imageries of NRSA (PAN &LlSS-III merged product of minimum resolution corresponding to 1 :25,000scale) and Survey of India topographical maps (scale 1: 50,000). In case therequired Survey of India maps are available in digitized form, the same shall beprocured and used by the Contractor. The Google Imageries, if required mayalso be used route alignment. The contractor shall identify & examine threealternative route alignments and suggest to the Owner the optimal route

alignment between the terminal points.

2.2 Requirement of Transmission Line Routing

a) The alignment of the transmission line shall be most economical from the pointof view of construction and maintenance.

b) Routing of transmission line through protected /reserved forest area should beavoided. In case it is not possible to avoid the forests or areas having large treescompletely, then keeping in view of the overall economy, the route should bealigned in such a way that cutting of trees is minimum.

c) The route should have minimum crossings of Major Rivers, Railway lines,National / State highways overhead EHV power lines and communication lines


6/27

03.03.2014

h) Crossing of power lines shall be minimum. Alignment shall be kept at aspecified distance from existing lines considering ROW and tower fallingdistances.

i) Crossing of communication line shall be minimized and it shall be preferably atright angle. Proximity and parallelism with telecom lines shall be eliminated toavoid danger of induction to them.

j) Areas subjected to flooding such as nalla shall be avoided.

k) Restricted areas such as civil and military airfield shall be avoided. Care shallalso be taken to avoid aircraft landing approaches.

l) All alignment should be easily accessible both in dry and rainy seasons to enablemaintenance throughout the year.

m) Certain areas such as quarry sites, coffee, tea, tobacco and saffron fields and richplantations, gardens & nurseries which will present the Owner problems inacquisition of right of way and way leave clearance during construction andmaintenance should be avoided.

n) Angle points should be selected such that shifting of the points within 100 mradius is possible at the time of construction of the line.

o) The line routing should avoid large habitations, densely populated areas forest,animal/ bird sanctuary etc., to the extent possible.

p) The areas requiring special foundations and those prone to flooding should beavoided.

2.3 For examination of the alternatives & identification of the most appropriate

route, besides making use of information's /data /details available/extractedthrough Survey of India Topographical maps, Google Images and computer-aided processing of NRSA's satellite imagery, the contractor shall also carryoutreconnaissance /walk over survey/ preliminary survey as may be required forverification & collection of additional information/data/details.


7/27

03.03.2014

2.5 Final digitized route alignment drawing with latest topographical and other

details/features including all rivers, railway lines, canals, roads etc. up to 5 kms .on either side of selected route alignment shall be submitted by the Contractorfor Owner's approval along with report containing other information's/details asmentioned above. Changes in the route alignment, if any, during detailed survey,shall be incorporated in the final digitized route alignment drawing.

3.0 Detailed Survey

3.1 The detailed survey shall be carried out using DGPS, Total Stations, digitaltheodolites etc. along the approved route alignment. As an alternative, thecontractor may also use ALTM (Air borne Laser Terrain Modeling) techniquesof equal or better accuracy for the detailed survey.

3.2 Soil resistivity, along the route alignment shall be measured in dry weather byfour electrode method keeping inter-electrode spacing of 50 mtrs. For

calculating soil resistivity formula 2 ar (where a = 50 m and r = meggerreading in ohms) shall be adopted. Measurement shall be made at every 2KMalong the length of route. In case the soil characteristics changes within 2 KM,values shall have to be measured at intermediate locations also. Megger readingand soil characteristics should also be indicated in the soil resistivity results.

3.3 Route Marking

a) The route of the transmission line shall be recorded using DGPS of positionalaccuracy less than 3mtr.

b) The co-ordinates of all the angle points as well as other important crossings,landmarks etc. shall be recorded using DGPS for easy relocating. In addition theangle point locations etc shall be marked using marking stones of size 200 x200 x 1000 mm, with approved marks including painting above the ground level

and yellow lettering and marking the direction of incoming and out going linesare to be marked clearly on the top with red color. If the distance between suchanchor points is more than 1KM one more directional stone is to be fixed. Soalso for the road crossings, railway crossing and nala crossings on both thesides .


8/27

03.03.2014

3.4 Profiling

a) The complete profiling along the route shall be carried out using modernsurveying equipments viz, total stations, DGPS, digital theodolite, long rangescanners etc. Reference levels at every 20 meters along the route are to berecorded. In case of hilly terrain/undulations RL shall also be measured for10mtr on either side of center line in lateral direction (perpendicular to theline).R/Ls at other undulations along the route as well as in the route plan andother enroute details viz. Crossings, building & structure, trees & otherinfrastructure etc. shall also be recorded. Areas along the route, which in theview of the contractor, are not suitable for tower spotting, shall also be marked.

b) The complete profiling details shall be digitized and the data shall be prepared &stored in the format compatible to computer-aided tower spotting software.

c) A printed/plotted output of the digitized profiling shall be submitted by thecontractor to Owners site-in-charge for review before taking up computer-aidedtower spotting.

3.5 Optimization of Tower Location/Tower Spotting.

a) Optimization of tower locations shall be done by the contractor using computer-aided tower spotting software- PLS-CADD. In order to verify the results ofcomputer aided tower spotting, the contractor shall furnish sample

calculations and manual tower spotting drawings for some typical sections.

b) The sag-tension characteristics of the conductor as well as tower spotting datashall be furnished by the contractor for the owners approval before execution.Sag template curves, shall be prepared by the contractor on acrylic sheetindicating cold curve, hot curve, ground clearance curve and supportfooting curve and the same shall be submitted to the owner.

3.6 Tower Spotting.While, profiling and spotting the towers the following shall be borne in mind.

a) Span:

h l h f h ll b f


9/27

03.03.2014

c) Loading

There shall not be any upward force on suspension towers under normal workingconditions and the suspension towers shall support at least the minimum weightspan as provided in the designs. In case uplift is unavoidable, it shall beexamined if the same can be overcome by adding standard body extensions tothe towers failing which tension towers designed for the purpose shall beemployed at such positions.

d) Road Crossing

At all important road crossings, the tower shall be fitted with double suspensionor tension insulator strings depending on the type of tower but the groundclearance at the roads under maximum temperature and in still air shall be suchthat even with conductor broken on adjacent span, ground clearance of the

conductor from the road surfaces shall not be less than 12.00 mtrs. At allnational highways tension towers shall be used and crossing span shall not bemore than 250 meters.

e) Railway Crossings

All the railway crossings coming-enroute the transmission line shall beidentified by the Contractor. At the time of detailed survey, the railway crossingsshall be finalized as per the regulation laid down by the Railway Authorities.The following are the important features of the prevailing regulations (revised in1987).

i. The crossings shall be supported on DD/D type tower on either sidedepending on the merits of each case.

ii.

The crossing shall normally be at right angle to the railway track.iii. The minimum distance of the crossing tower shall be at least equal to theheight of the tower plus 6 mtrs away measured from the centre of thenearest railway track.

iv. No crossing shall be located over a booster transformer, tractionswitching station, traction sub-station or a track cabin location in an


10/27

03.03.2014

g) Power line Crossings

Where this line is to cross over another line of the same voltage or lowervoltage, DD/D type tower with suitable extensions shall be used. Provisions toprevent the possibility of its coming into contact with other overhead lines shallbe made in accordance with the Indian Electricity Rules, 1956/ Indian ElectricityAct 2003 as amended up to date.Minimum clearance in mtr. Between lines when crossing each other

Sl.No.

Nominal System Voltage 66/110 KV 220 KV 400 KV

1. 66/110 KV 3.05 4.58 5.49

2. 220 KV 4.58 4.58 5.49

3. 400 KV 5.49 5.49 5.49

For power line crossings of voltage level of 66 KV and above, an angle towersshall be provided on either side of DD/D type tower which can be temporarydead end condition with proper guying.

The angle of crossing has to be preferably 90 degree and at any time should notbe below 60 degree

h) Telecommunication Line Crossings

The angle of crossing shall be as near to 90 degree possible. However, deviationto the extent of 30 degree may be permitted under exceptionally difficultsituations.

When the angle of crossing has to be below 60 degree, the matter will bereferred to the authority in-charge of the telecommunication System. On arequest from the Contractor, the permission of the telecommunication authoritymay be obtained by the Owner.

Also, in the crossing span, power line support will be as near the


11/27

03.03.2014

3.7 Clearance from Ground, Building, Trees etc.Clearance from ground, buildings, trees and telephone lines shall be provided inconformity with the Indian Electricity Rules, 1956 / Indian Electricity Act2003as amended up to date.

a) The Contractor shall estimate/enumerate numbers of trees that are to be cutwithin right of way of transmission line along the proposed route alignment.

Contractor may please note that Owner will not pay any compensation for anyloss or damage to the properties or for tree cutting due to Contractors surveywork.

b) The trees and bushes existing within 17.50 mtr. on either side of the central linealignment shall be estimated/enumerated by the contractor and marked withquality paint serially from angle point 1 (One) onwards. The trees list shouldcontain the following:

i. Approx. Girth (circumference) measured at a height of 1 mtr. fromGround level.

ii. Approximate height of the tree with an accuracy of + 2 metres.iii. Name of the type of the species/tree.

c) The bushy and undergrowth encountered in the 17.50 mtr. belt on either side of

the central line alignment should also be evaluated with its type, height and girthclearly indicating in the tree /bush statement. The tree/bush statement shouldalso approximately indicate the percentage area within right of way wheretree/bush exist.

d) The contractor shall also intimate the Owner, his assessment about the likelyamount of tree & crop compensation etc. required to be paid by the Ownerduring execution stage for trees in 35 mtr. belt. This assessment shall be doneconsidering prevailing practices/guidelines, local regulations and other inquiriesfrom local authorities.

e) The contractor shall also identify the forest/non-forest/ deemed forest/privateland/Government land areas involved duly authenticated by concerned

h i i


12/27

03.03.2014

vii. The contractor shall furnish village Revenue survey map duly

mentioning the survey nos., name of the owner (to be collected throughRTC-record of rights and tenancy certificate) along the proposed corridorwidth.

viii. The village Revenue survey map is to be certified by Govt. Surveyor andcountersigned by Revenue Inspector/Village Accountant.

ix. The village Revenue survey map is to be digitized and Geo referencedand superimposed on the selected corridor duly indicating the survey noof lands coming under the corridor.

f) The contractor shall finalize the forest clearance proposal on the prescribedformat duly completed in all respects for submission by the owner to the forestdepartment.

3.8 Preliminary Schedule

The profile sheets showing the locations of the towers together with preliminaryschedules of quantities indicating tower types, wind & weight spans, angle ofdeviation, crossing & other details etc. shall be submitted by the contractor forreview & approval by Owners site-in-charge.

3.9 Detailed Survey of Tower Locations.

a) The detailed survey shall be conducted for spotting the tower locations onground conforming to the approved profile and tower schedule.

b) The co-ordinates of all the tower locations shall also be recorded using DGPS ofpositional accuracy less than 3mtr. For easy relocating. The position of all towerlocations shall be marked in the final digitized route alignment drawing withrelative distance from any permanent benchmark in the area.

c) The contractor shall also collect required data at each tower location in respectof soil strata, ground water level, history of water table in adjacent areas/surfacewater and classify the suitable type of foundation at each location and detailedsoil investigations carried out at selected locations etc.

3.10 Contouring at hilly / undulated locations

a) The levels up or down of each pit center with respect to center of tower location


13/27

03.03.2014

position of all type of towers, span length, type of foundation for each tower,

benching & revetment requirement, unequal leg extensions, deviation at allangles, crossing & other details etc.

3.12 Survey Methodology & Precision

a) All elevations shall be referenced to benchmarks established by the survey ofIndia. Leveling operations shall begin and end at benchmarks approved by theOwner.

b) During the leveling of the profile, check surveys will be effected at intervals notexceeding 50 kms . With benchmarks of known elevations. The difference inelevations as surveyed by the contractor and as declared by Survey of India forthese benchmarks shall not exceed the precision required for 3 rd order surveyse24k where k is the distance between benchmarks in km and e is the differencebetween elevations in mm.

c) In the absence of suitable benchmarks the leveling shall be done by twoindependent leveling parties working in opposite directions along the same line.The difference in elevations between the two surveys shall not exceed theprecision required for 3 rd order surveys as stated above.

d) All important objects and features along the transmission line centerline(railways, highways, roads, canals, rivers, transmission lines, distribution lines,telephone lines etc.) shall be surveyed and located with a positional accuracy of1:2000 between points of known horizontal position.

3.13 Survey Report

a) Complete BOQ of the transmission lines as per the technical specifications shallbe furnished in the survey report.

b) Each angle point locations shall be shown with detailed sketches showingexisting in the close vicinity permanent land marks such as specific tree(s), cattleshed, homes, tube wells, temples, electric pole/tower, telephone pole, canal,roads, railway lines etc. The relative distance of land marks from the anglepoints and their bearings shall be indicated in the sketch. These details shall be


14/27

03.03.2014

ii. All observations which the Contractor thinks would be useful to the

construction of the transmission lines mentioned under scope of work areto be reported.

iii. Suggestions regarding the number of convenient zones (linesegments/portions) in which the entire alignment can be divided keepingin view the convenience of line construction, operation, maintenance etc.are to be given.

iv. Suggestions regarding location for setting up stores during lineconstruction in consultation with Owner representatives shall also beprovided by the Contractor.

v. Working months available during various seasons along the final routealignment, with period, time of sowing & harvesting of different type ofcrops and the importance attached to the crops particularly in the contextof way leave problems and compensation payable shall be stated by the

Contractor. vi. Availability of labour of various categories and contractors of civil worksshall also be reported.

vii. Some portions of the line may require clearance from various authorities.The Contractor shall indicate the portion of the line so affected, thenature of clearance required and the name of concerned organizationssuch as local bodies, municipalities, P&T (name of circle), Inlandnavigation, Irrigation Department, PGCIL Zonal railways, DivisionalForest Authorities, Military, Civil and Defence Authorities etc.

d) All the requisite data for processing the case of statutory clearances such asPTCC, Forest, Railway and Highway Authority shall be provided along with thereport.

e) The contractor shall also collect & report details pertaining to pollution levels

envisaged along the transmission line.f) Six copies of survey reports (Hard & soft) and all documents shall be furnished

by the contractor to the Owner.

4.0 Geotechnical Investigations


15/27

03.03.2014

shall apply. Any other information required for such locations shall be obtained by

Contractor and furnished to Owner.

4.2 Scope

a) The scope of work includes detailed soil investigations and furnishing bore logdata at various tower locations. However, during actual execution of work, thelocations shall be decided by the Engineer-in-Charge, depending upon the soilstrata, terrain and other factors. Based on the bore log data/soil parameter/soilinvestigation results, the Contractor shall recommend the type of foundationssuitable for each locations and the same shall be got approved by the Owner.

b) These specifications cover the technical requirements for a detailed Geotechnical

investigation and submission of a detailed Geotechnical Report. The work shallinclude mobilization of all necessary tools and equipment, provision ofnecessary engineering supervision and technical personnel, skilled and unskilledlabour, etc. as required to carry out the entire field investigation as well aslaboratory tests, analysis and interpretation of data collected and preparation ofthe Geotechnical Report. Contractor shall also collect data regarding variation ofsubsoil water table along the proposed line route. The aforementioned work shallbe supervised by a graduate in Civil Engineering having at least 5 years of siteexperience in geotechnical investigation work.

c) Contractor shall make his own arrangements to establish the co-ordinate systemrequired to position boreholes, tests pits and other field test locations. Contractorshall determine the reduced levels (R.L.s) at these locations with respect tobenchmarks used in the detailed survey. Two reference lines shall be establishedbased on survey data/details. Contractor shall provide at site all required survey

instruments to the satisfactions of the Owner so that the work can be carried outaccurately according to specifications and drawings. Contractor shall arrange tocollect the data regarding change of course of rivers, major natural streams andnallas etc., encountered along the transmission line route from the best availablesources and shall furnish complete hydrological details including maximumvelocity discharge, highest flood level (H.F.L.), scour depth etc. of the


16/27

03.03.2014

numbers of vane shear tests are performed and the results correlated with other

soil parameters.

f) One copy of all field records and laboratory test results shall be sent to Owneron a weekly basis. Owner may observe all the laboratory testing procedures.

g) The Contractor shall interact with the Owner to get acquainted with the differenttypes of structures envisaged and in assessing the load intensities on thefoundation for the various types of towers in order to enable him to makespecific recommendation for the depth, founding strata, type of foundation andthe allowable bearing pressure.

h)

After reviewing Contractors geotechnical investigation draft report. Owner willcall for discussions, in order to comment on the report in the presence ofContractors Geotechnical Engineer. Any expenditure associated with theredrafting and finalizing the report, traveling etc. shall be deemed included in therates quoted for the geotechnical investigations.

i) Contractor shall carry out all work expressed and implied in Clause 4.1(b) ofthese specifications in accordance with requirements of the specification.

j) The Contractor shall prepare and submit soil profile along the transmission lineroute (in digitized form, with digitized route alignment drawing as base)indicating salient soil characteristics/features, water table etc. based on detailedsoil investigations and other details/information collected during detailed survey.

4.3 General Requirements

a) Where ever possible, Contractor shall research and review existing localknowledge, records of test pits, bore holes etc. types of foundations adopted andthe behavior of existing structures, particularly those similar to the presentproject.


17/27

03.03.2014

underground works e.g. worked out ballast pits, quarries, old brick fields, mines,

mineral workings etc.

e) It is essential that equipment and instruments be properly calibrated at thecommencement of the work. If the Owner so desires. Contractor shall arrangefor having the instruments tested at an approved laboratory at its cost and shallsubmit the test reports to the Owner. If the Owner desires to witness such tests,Contractor shall arrange for the same.

4.4 Codes and Standards for Geotechnical Investigations.

a) The Geo-technical investigations and report shall conform to all standards,specifications and IS codes of practice (shall be the latest editions including allapplicable official amendments and revision). In case of conflict between thepresent specifications and those referred to herein, the former shall prevail.Internationally accepted standards which ensure equal or higher performance

than those specified shall also be accepted.4.5 Field investigation for soils.

Detailed soil investigation and tests like bores, augher boring, shell and augerboring, SPT, Vane shear test, Dynamic cone penetration test, etc and other testnot specifically mentioned and report of which are required for designing towerfoundations shall be carried out by the contractor as per the relevant IS codes inforce and detailed report shall be submitted to the owner for approval andrecords.

4.6 Essential Requirements

a) Depending on the types of substrata encountered, appropriate laboratory testsshall be conducted on soil and rock samples collected in the field. Laboratorytests shall be scheduled and performed by qualified and experienced personnelwho are thoroughly conversant with the work. Tests indicated in the schedule of

items shall be performed on soil, water and rock samples as per relevant IScodes. One copy of all laboratory test data records shall be submitted to ownerprogressively every week. Laboratory tests shall be carried out concurrently withthe field investigations as initial laboratory tests results could be useful inplanning the later stages of field work. A schedule of laboratory tests shall beestablished by Contractor to the satisfaction of the Owner within one week of


18/27

03.03.2014

d) Undisturbed soil samples retained in liners or seamless tube samplers shall be

removed, without causing any disturbance to the samples, using suitablydesigned extruders just prior to actual testing. If the extruder is horizontal,proper support shall be provided to prevent the sample from breaking. For screwtube extruders, the pushing head shall be free from the screw shaft so that notorque is applied to the soil sample tube shall be cut by means of a high speedhacksaw to proper test length and placed over the mould before pushing thesample into it with a suitable piston.

e) While extracting a sample from a liner or tube, care shall be taken to assure thatits direction of movement is the same as that during sampling to avoid stressreversal.

4.7 Geotechnical Investigation Report

a) General

i. Contractor shall submit a formal report containing geologicalinformation of the region, procedures adopted for geotechnicalinvestigation, field observation, summarized test data, conclusions andrecommendations. The report shall also include detailed bore logs,subsoil sections, field test results, laboratory observations and testsresults both in tabular as well as graphical form practical and theoreticalconsiderations for the interpretation of test results, supportingcalculations for the conclusions drawn etc. initially, Contractor shallsubmit three copies of the report in draft form for Owners review.

ii. Contractors Geotechnical engineer shall visit Owners Corporate Officefor a detailed review based on Owners comments in order to discuss thenature of modifications, if any, to be done in the draft report. Contractorshall incorporate in the report the agreed modifications and resubmit therevised draft report for approval. Ten copies of the detailed final

approved report shall be submitted to Owner together with one set ofreproducible of the graphs, tables etc.

iii. The detailed final report based on field observations, in situ andlaboratory tests shall encompass theoretical as well as practicalconsiderations for foundations for different types of structures


19/27

03.03.2014

conducted, samples collected at different depths and the rock stratum, if

encountered.

iii. Geological information of the area including geomorphology, geologicalstructure, lathe logy, stratigraphy and tectonics, core recovery and rockquality designation (RQD) etc.

iv. Observations and data regarding change of course of rivers, velocity,scour depths, silt factor etc., and history of flood details for mid-streamand river bank locations.

v. Past observations and historical data, if available, for the area or for otherareas with similar soil profile, or with similar structures in thesurrounding areas.

vi. Results of all laboratory test summarized for each sample, for each layer,

along with all the relevant charts, tables, graphs, figures, supportingcalculations, conclusions and photographs of representative rock cores.

c) Recommendations

Recommendations shall be provided for each tower location duly consideringsoil type and tower spotting data. The recommendations shall provide all designparameters and considerations required for proper selection, dimensioning andfuture performance of tower foundations and the following:

i. The subsurface material must provide safe bearing capacity and upliftresistance by incorporating appropriate safety factors thereby avoidingrupture under ultimate loads.

ii. Movement of the foundation, including short and long term componentsunder transient and permanent loading, shall be strictly controlled with

regard to settlement, uplift, lateral translation and rotation.4.8 Rates and Measurements

a) Rates

The contractors quoted rate shall be inclusive of making observations


20/27

03.03.2014

i. Boreholes shall be executed to specified depth of 40m . If refusal strata is

reached (i.e. SPT-N value is greater than 100 continuously for 5m depth)with characteristics of rock the borehole may be terminated at shallowerdepth i.e. at 5m in refusal strata, with prior approval of the Owner.

ii. Laboratory testing shall be conducted on all soil samples to determinegrain size distribution, liquid limit and plastic limit of the different soilstrata encountered.

iii. Geotechnical Report must furnish the following:

Geotechnical investigation schemes. Bore-logs indicating soil stratification, with IS classification,

sampling details and SPT N values. Soil cross-sections along various boreholes in two orthogonal

directions indicating soil stratification based on field and laboratorytests.

Grain size distribution curves. IS classification of soils. Shear tests (UU) to be done on saturated soil samples Bearing capacity of soil at different levels. Scouring depth of river. Highest flood level (H.F.L.). Maximum discharge, velocity etc. (from authenticated source such as

CWC or appropriate State authorities). Recommendations regarding type of foundation to be adopted at thelocation.

c) A check list for reporting results of river crossings locations details, detailed soilinvestigation and river values for river crossing locations shall be furnished tothe owner.

4.10 Special Terms and conditions for Geotechnical Investigation in the Riverbed.

a) Contractor is required to mobilize a suitable arrangement (floating pontoon,plant, equipment etc.) to carry out geotechnical investigation work in creek/river


21/27

03.03.2014

d) Contractor shall make his own arrangements for locating the coordinates and

position of boreholes in creek/river with respect to two grid-lines indicated byPurchaser.

e) Boring in creek or river shall be payable only below the bed level and nopayment shall be made for lowering the casing in water.

f) Contractor shall arrange for necessary transportation on water (e.g. motor boat)to facilitate the supervision of work by officials of Purchaser at its own cost.

g) Full details of the construction plant, proposed working method for boring andsampling in water shall be submitted along with the Tender.

5.0 STATUTORY REGULATIONS AND STANDARDS

5.1 Contractor is required to follow statutory regulations stipulated in Electricity

(Supply) Act 1948, Indian Electricity Rules, Indian Electricity Act 2003 andother local rules & regulations.

5.2 The codes and standards referred to in these specifications shall govern. In caseof a conflict between such codes/standards and these specifications, theprovisions of the specifications shall prevail. Such codes, standards referred toshall mean latest revisions, amendments, changes adopted and published byrelevant agencies.

5.3 Other Internationally acceptable standards which ensure equivalent or betterperformance than those specified shall also be acceptable.


22/27

03.03.2014

ANNEXURE-A

GENERAL DESCRIPTION OF TOWERS FOR TRANSMISSION LINE

1.0 Type of Towers

(a) 400 KV D/C, 220 KV D/C, 110KV/66KV Transmission lines

Type of Tower Deviation Limit Typical Use

DA/A 0 deg 2 deg a) To be used as tangent tower

DB/B 0 deg 15 deg a) Angle tower with tension insulatorstring

DB/B 0 deg c) To be used as section tower

DC/C 15 deg 30 deg a) Medium angle tower with tensioninsulator string.DD/D 30 deg 60 deg a) Large angle tower with tension

insulator string.b) Anchor tower for river crossing

with 0 deg. Deviations on crossingside and 0 deg. To 30 deg.Deviation on line side.

DDE/DE 0 deg a) Complete dead end.

b) Dead end with 0 deg to 15 degdeviation both on line andsubstation side (slack span)

2.0 Tower spotting data will be furnished to the successful bidder during

execution.


23/27

03.03.2014

Technical specification for 220 KV Transmission Lines 23

Typical bill of quantities 220 KV Transmission Line SurveyingRate (Rs)

Sl.No. Description of item Quantity Unit In figures In words Amount (Rs)

1. Preliminary survey for identification of 3alternative routes using low resolution satelliteimageries (1:25,000 PAN + LISS merged) ofNRSA. Google Images and Survey of Indiamaps and finalization of most economical,optimum route showing the topographical andother features upto 5 Kms. on either side andindicating final selected route alignment anddigital modeling in undulated hilly terrain alongthe proposed route using contour data fromtopographical map and submission ofpreliminary survey reports for approval as

detailed in technical specifications.

Kms.

2. Detailed survey along the approved routealignment approved after conducting thepreliminary survey by using Modern Surveyequipments like GPS/DGPS/Totalstations/Digital theodolites including profiling,tower spotting and optimization of locations byusing computer aided techniques like ALTM as

well as other activities as detailed in the scope ofwork using PLS-CADD software andsubmission of draft report for approval.

a) Drawing the route profile includingGeographical features like Nalas, Rivers,

Kms.


24/27

03.03.2014


Gardens, P&T Lines, Railways crossing etc.,

b) leveling of the profile with reference toSurvey of India bench marks (MSL)

c) Tower Schedule.

d) Line Schedule.

e) Burgie details by using Modern Surveytechniques and providing GPS, Co-ordinates ateach anchor points for identification of anchorlocations including permanents marks like poles,telephones lines, buildings etc.,

3 Providing and fixing marking stones of size 200 x 200 x 1000 mm, with approved marks

including painting above the ground level and yellow lettering and marking the direction ofincoming and out going lines are to be markedclearly on the top with red color. If the distancebetween such anchors points is more than 1KMone more directional stone is to be fixed. So also

for the road crossings, railway crossing andnala crossings on both the sides .

Each stone

4 Conducting Soil resistivity test along theselected route and submitting the test results inthe form of draft report as detailed in thetechnical specifications.

Per Test

5. Making 150mm nominal diameter bore holes atvarious locations in soil using suitable approved

Rmtr


25/27

03.03.2014


method of boring including cleaning the bore

holes, collection of samples, observation ofground water level, collection ofundisturbed/disturbed sample and back filling ofbore holes on completion of work as perspecification and instruction of engineer incharge of work .The scope also includes thesubmission of final report containing the borelog details with classification of soil for thepurpose of providing foundation along with GPSco-ordinates of each boreholes.

6. Digitized contouring at undulated/hilly towerlocations as detailed in technical specificationsfor assessing the quantum of benching andrevetment required and submission of draftreport on the work done.

Location

7.Preparation of Schedules.a. PTCC Proposal: containing PTCCquestionnaires, topo sheet extracts with markingof the proposed line, SR report, tower sketch,station single line diagram etc.,(30 copies/set)

Per set

b Railway Crossing proposal with drawinginclusive of graph sheets and other stationerymaterials, labour etc., (10 sets/per crossing)

PerCrossing

c Tree schedule containing the details like nameof trees, girth size, distance from central line ofthe alignment, approximate height of tree etc.,complete and submission of draft report forapproval. The details shall be survey no. wise.

PerHectare


26/27

03.03.2014


d Forest proposals : inclusive of all works like

fixing of stones of size 0.20 x 0.20 x 1.00mburied in the ground at every 20 mts in thecentre line and both ends of the corridor,painting of each tree after chipping, writing thenumbers on the tree, taking girth size of all thetrees coming in the corridor at 1 Mtr height fromGL, approximate height of the tree and forestclearance proposals etc., complete includingsubmission of report/proposal in 10 sets. Thework shall be carried out as per requirement andas per instruction of Engineer-in-charge & as perlatest circular of Forest Department.

Per Km

8. Preparation of Detailed land schedule alongthe Right of Way . Plotting of line route on thedigitized revenue village maps to show details of

land along the line corridor with survey nosalong with its associated name of the land ownerthrough RTC.

Kms

9. Submission of Detailed consolidated report onthe surveying work done appending all approveddraft reports including all relevant informationcollected during survey, calibration certificatesof the instruments used for the work, photos

taken at site and submitting soft copies of alldocuments and reports in 6 sets. The detailedreport shall contain following approved draftreports

Preliminary Report Detailed Survey Report

Job


27/27

03.03.2014


Soil Resistivity Report

Soil classification report with locationwise. Tree Schedule Line Schedule Land schedule. Burgie details Digitized contours

Digitized village map geo referenced andsuperimposed on the line corridorTotal Tender Price (infigures)

(in words)

Documents

Modern Survey for KPTCL 220 KV Transmission Lines