Indian Railways - AC Traction Manual Volume 1 PDF

CHAPTER X SURVEYS, ESTIMATES & PROGRAMMES 11000 General Engineering Code covers various aspects of Project development process. The following relevant Chapters of the Code should also be referred: Chapter II Modes of Investigation of Railway Project Chapter III Traffi...

CHAPTER X SURVEYS, ESTIMATES & PROGRAMMES 11000 General Engineering Code covers various aspects of Project development process. The following relevant Chapters of the Code should also be referred: Chapter II Modes of Investigation of Railway Project Chapter III Traffic Survey Chapter IV Engineering Survey - Reconnaissance, Preliminary and Final Location Surveys Chapter V Engineering Survey - Project Reports, Techno- Economic Survey Report and Feasibility Report Chapter VI Estimates I. SURVEYS 11001 Railway Electrification Surveys 1. Only a brief introduction to Railway Electrification surveys is given in this Chapter. 2. Railway Electrification surveys may be classified broadly in two categories;- a) Cost-cum-feasibility-survey as a pre-investment investigation to assist decision making: and b) Foot by foot survey to assist in preparation of working designs and drawings for actual construction work. In case of urgency it may be necessary to include portions of (b) along with (a), but normally the two surveys are taken up separately. 11002 Cost-cum-Feasibility Survey It is quick survey of the route proposed for electrification to examine major engineering installations which may have a bearing on the cost of electrification. 1) Civil Works: This will include study of heavy overline structures like flyovers, road over bridges, through girder bridges and long deck type girder bridges and tunnels to examine whether these will require major or minor modification to permit erection of overhead equipment. An examination of the proposed remodelling plans, rack renewals, reballasting including changes in the level of track, realignment of curves, all having a bearing on track geometry and the dates when these are proposed to be completed, will be necessary. In yards, a survey of track proposed to be wired will have to be examined for track centres to prepare slewing plans and assess their cost, for location of OHE structures. - Feasibility of running 12 wide stock on suburban routes in vicinity of cities. INDIAN RAILWAYS -AC TRACTION MANUAL -VOLUME 1 - Availability of suitable land for location of locomotive shed, remote control centre, maintenance depots. - Quick survey of soil to assess cost involved in foundation. 2. Signalling & Telecommunication works. - Modification needed to existing installations General Power Supply. 3. Modification to track crossings - Modification to HT and LT lines. 11003 Foot by Foot Survey On acceptance of a project report, foot by foot detailed surveys are required for the preparation of working drawings for the electrification. The scope broadly is as under: - - Checking of configuration of layout of the track, chainage of turnout, cross overs, diamond crossing etc., Inter - track distances, curvature of tracks, versine, super elevation, cross section of track formation at an interval of 200m, detail of embankment/cutting etc. - Checking of setting distance of existing signals, signalling rocks, wires junction boxes, cranes blocks etc. - Checking of position of cabins, cable huts, station buildings, goods shed etc. - Checking of position of overline structures. - Determination of type of soil along the route at intervals not more than 5 Km. - Collection of site details regarding bridges, tunnels etc. including study of clearances. The data so collected is utilized to correct and update survey plans. These are then used for of preparation of pegging plans showing tentative location of OHE structures following 'Principles for OHE Layout Plans and Sectioning Diagrams for 25 kV ac Tractions', Appendix I, Vol. II of this manual. Site confirmation of prepegging plans is then carried to ascertain feasibility of structural locations. II. ESTIMATES 11004 Estimates All proposals for- a) The construction or purchase of material for new works or assets, b) The renewal and replacement of existing works or assets, c) The scrapping, dismantlement or abandonment of existing works or assets, d) The repairing or reconditioning; e) Temporary and experimental works; Should be scrutinized by the authority Competent to sanction them before any expenditure or liability is incurred thereon. INDIAN RAILWAYS - AC TRACTION MANUAL - VOLUME 1 Broadly estimates are of two types: - a) Abstract Estimates b) Detailed Estimates 11005 Abstract Estimates An abstract estimate is prepared in order to enable to the authority competent to give administrative approval to the expenditure of the nature and magnitude contemplated to form a reasonably accurate idea to enable that authority to gauge adequately the financial prospects of the proposal. Abstract estimates avoid the expense and delay of preparing estimates for works in detail at a stage when the necessity or the general desirability of the works proposed has not been decided upon by competent authority. An abstract estimate should contain a brief report and justification for the work, specifications, and should mention whether funds are required in the current year and to what extent. It should also show the cost subdivided under main heads and subhead or specific items, the purpose being to present a correct idea of the work and to indicate the nature of the expenditure involved. The allocation of each item as between Capital, Development Fund, Open Line Works - Revenue, Depreciation Reserve Fund and Revenue should be indicated. 11006 Detailed Estimates On receipt of administrative approval to a project or scheme conveyed through the sanction to the abstract estimate relating there to detailed estimate for various works should be prepared and submitted for technical sanction of the competent authority. It should be prepared in sufficient detail to enable the competent authority to make sure that the abstract estimate sanctioned by the higher authority is not likely to be exceeded. No work included in an abstract estimate should be commenced till a detailed estimate for the same is prepared and sanctioned and adequate funds are allotted by the competent authority allots adequate funds. The detailed estimate will comprise (i) statements showing details of estimated cost and (ii) an outer sheet giving the abstract of cost of work, the report, the financial justification and the allocation. 11007 General Rules Applicable to All Estimates 1. Responsibility for Preparation of Estimates For proposals initiated in the Division estimates shall be prepared in the Division. Estimates of works, which the Senior Divisional Electrical Engineer or the Divisional Railway Manager is not empowered sanction, shall be submitted to the Chief Electrical Engineer duly verified by the Accounts Officer for Administrative approval and Technical sanction. 2. Design and Execution The designs and execution of all new works and designs of equipment should conform to IRS/RDSO Standards, Drawings, Codes, Rules, Principles, Guidelines wherever available. No work which infringes "Schedules of Dimensions" shall be executed unless prior sanction of the CRS has been obtained. 3. Altemative Proposals When alternative proposals are made, separate estimate should be prepared for each, together with a general abstract showing in tabular form the comparative cost of the various alternatives. 4. Grouping of Items As far as possible items of estimates chargeable to the same head or sub-head of account should be grouped together so that the number of items under expenditure posted in the Register of Work may be reduced to a minimum. INDIAN RAILWAYS AC TRACTION MANUAL - VOLUME I 5. Grouping of Works a) When two or more works are so connected either by their situation, or by the purpose or purposes which they are designed to serve, that the construction of one necessarily involves that of the other or others, the works should be considered to comprise one scheme and the aggregate estimated cost of the works so connected shall determine the authority competent to sanction expenditure on the scheme. When the works constituting a connected scheme are situated in more than one executive division separate detailed estimates should be prepared of the cost of the work in each division so that the Engineer entrusted with the actual construction may be in a position to watch expenditure against sanctioned estimate of the cost of the work in his charge. 6.Establishment and Other Charges a) It should be ensured that due provision for establishment charges is made in major schemes under the heading 'Establishment'. If any such charges are not foreseen and additional establishment is required, sanction of the competent authority should be obtained and the expenditure shown against 'Establishment' and not against 'Contingencies', the excess being subsequently provided for in a revised estimate, if necessary, or explained in the completion report. b) The engagement of work-charged establishment is subject to the following conditions- i) The cost of establishment should be shown in detail under separate sub-heads of the estimate. ii) If an Engineer, Supervisor, or other staff is actually employed on the supervision of two or more works his pay and allowance should be charged proportionately to those works.. Provisions made in Indian Railway Financial Code should be kept in view in respect of various charges to be included. 7. Currency of Sanction The sanction to estimate shall ordinarily remain current for 5 years from the date it has been accorded, unless it has been renewed for a further term by the acceptance of a revised estimate. Acceptance by competent authority, however, of a budget estimate which includes specific provision for expenditure on a work which is in progress, may be regarded as reviving for the year in which provision is made, the sanction to the estimate regardless of the five years limit. But if no work has been commenced within 2 years of the date of sanction, the sanction shall be considered as having lapsed and fresh sanction shall be obtained from the competent authority by submitting an up-to- date estimate. 8. Register of Estimates All estimates should, before they are submitted for accounts verification for sanction of the competent authorities, be registered in the office of origin. For this purpose register in the following form should be kept- INDIAN RAILWAYS - AC TRACTION MANUAL - VOLUME I