Mainline Railways

Final Location Survey

Once a decision has been taken during preliminary investigations about the general feasibility and desirability of a railway line, surveys are undertaken before the construction of the new line. The following types of surveys are normally conducted:

(a) Traffic survey

(b) Reconnaissance survey

(c) Preliminary survey

(d) Final location survey

 

Once a decision has been taken for a particular railway line to be constructed, a final location survey is done. The instruments used are generally the same as in the case of the preliminary survey. Final location survey is done to prepare working details and make accurate cost estimates in certain cases. The principal differences between the preliminary survey and the final survey are as follows.

(a) In the final location survey, the alignment is fully staked with the help of a theodolite, whereas it is not obligatory to do so in the case of preliminary survey.

(b) In the final location survey, a more detailed project report is prepared and submitted.

(c) All working drawings are prepared in the final location survey.

 

The following tasks are carried out in the final location survey.

(a) The centre line is fully marked by pegs at 20 m. At each 100 m, a large peg should be used.

(b) Masonry pillars are built at tangent points of curves and along the centre line at intervals of 500 m.

(c) Longitudinal and cross levelling is done to ascertain the final gradient of the alignment. All gradients are compensated for curves.

(d) The sites for station yards are fully demarcated.

 

In the final location survey, the following set of drawings is prepared.

(b) General map of the country traversed by the project at a scale of about 20 km to 1 cm Index map, scale about 2.5 km to 1 cm

(c) Index plan and sections

(d) Detailed plans and sections

(e) Plans and cross section

(f) Plans of station yards

(g) Detailed drawings of structures

(h) Plans of junction arrangements

Objectives

The following broad objectives should be kept in mind when selecting the best possible alignment in the final location survey.

(a) Correct obligatory points

(b) Easy grades and flat curves

(c) Minimum cost of construction

(d) Minimum adverse effect on environment

(e) Ease of construction

(f) Potential for high speeds

(g) Avoidance of constraints for future expansion

(h) Minimum maintenance cost

Project Report

A final project report is prepared based on the final location survey. The report consists of the following.

Introduction

In this segment of the report, the following details are covered.

(i) Object of investigation and background

(ii) Programme and methodology of investigation

(iii) Special features of investigation

 

Characteristics of the Project Areas

In this segment the topographical outline of the areas and geographical features of the country are given to the extent to which these are likely to affect the alignment, probable stability of the line, cost of construction, working expenses, or future prospects of the proposed line. Climatic and rainfall characteristics and environmental characteristics such as the presence of corrosive factors, pollution, etc., which may have an effect on the design and maintenance of structures and bridges, are also brought out.

 

Standard of Construction

This segment gives details of the following.

Gauge The gauge adopted for the proposed line and the reasons, if any, for adopting it. Category of line The category of the line, the maximum speed potential of the line, the maximum axle load, the loading standard of bridges, and the basis for adopting the same.

Ruling gradient The gradient adopted and the basis for its selection.

Curves The sharpest degree of curvature adopted, the basis for its adoption, and its impact on the projected speed compatible to the category of line.

Permanent way The rail section adopted, the decision as to whether welding of the rails will be carried out or not, and the type and density of sleepers provided in the project estimate.

Ballast The type and depth of ballast cushion provided.

Stations Spacing of stations in the case of new lines, provision for futureintermediate stations, and the scale of facilities contemplated at stations.

Signalling and telecommunication The standard of signalling adopted and thescale of communication facilities provided.

Traction The type of traction proposed.

Other details Road crossings, station machinery, residential accommodation,service and maintenance facilities, etc.

 

Route Selection

This segment provides relevant information and data related to the various alternative routes examined and gives an insight into the factors influencing the choice of the route adopted for the project.

 

Project Engineering

This section furnishes information and data for the project manager to enable him to understand the scope and extent of the project and to assist him in formulating the strategy for the execution and management of the project. It must focus on the problems likely to be encountered, identify the areas requiring special attention, and place the knowledge and information gathered at the investigation stage for evolving optimal solutions.

 

Estimation of Cost and Construction Schedule

This segment gives a cost estimate of preliminary expenses, land, formation, bridges, permanent way, station building and residential quarters, road crossings, station equipment, signalling and interlocking, rolling stock, etc. The schedule of’ construction as well as investment is also given. A network should be developed for projects costing above Rs 5 million.

 

Project Organization

This section details the organizational structure for the execution of the project, the proposed headquarters of the project manager and other construction officers, as well as the allocation of the various construction activities. Health and hygenic conditions provided to the staff as well as the provision of necessary medical establishments may be indicated, along with suggested plans providing for the housing of staff and labour and the construction of temporary office buildings. Comments regarding the availability of water for construction purposes and its suitability for drinking purposes may also be given. The purpose and final cost allocation of such plans may also be indicated.

 

Tabulated Details

The report is accompanied by tabulated details of curve abstract, gradient abstract, bridge abstract, important bridges, stations, machinery, stations, and station sites.

 

Arrangement of Documents in the Report

All the documents pertaining to a final location survey report should be in the following order.

 

  1. Covering note
  2. Index
  3. Report
  4. A list of drawings accompanying the report
  5. Appendices to the report

 

(a) Historical and geographical aspects

(b) Location report

(c) Rates for construction work

 

Primerail Infralabs uses Standard Procedure and Codes to Ensure Best Quality Deliverables to Client

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Project Report

  • Track Alignment

Primerail Provides Track Alignment using world class licensed Softwares and tools, with Quality Reports & Drawings.

Track Alignment are one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about Track Alignment or any civil engineering needs.

 

  • Bridges GADs & Designs

Bridges are one of the important component of Civil Engineering Discipline.

Primerail offers GAD, Design of Bridges of different span and Specifications according to the Client requirement.

Bridges GADs & Designs are one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about Bridges GADs & Designs or any civil engineering needs.

 

  • RSI Studies & Pier Forces

Primerail Services include Rail Structure Interaction Studies & Analysis using MIDAS, Standard Codes to Deliver Quality Output.

RSI Studies & Pier Forces are one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about RSI Studies & Pier Forces or any civil engineering needs.

 

  • Waterway Studies

Primerail Services include Waterway studies Using Standard Methods, Procedures & Codes

Waterway studies are one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about Waterway studies or any civil engineering needs.

 

  • Formation Stability

One of the main questions in construction is the question of the project stability. The determination of the stability level is usually carried out at the initial stage of construction, but sometimes it is necessary to calculate the stability of an existing structure in order to improve its reliability; the stability analysis here should be rather simple. One of the methods of stability analysis for the construction project may be the evolution of its state through the stability criteria

In order to carry out the analysis of processes and elements composing the notion “construction projectstability”, it is necessary to understand both the content and the sense of this term. In general, the stability is a process or a phenomenon which is able to resist the oscillations and changes.

Primerail Services include Formation Stability Reports.

Formation Stability Reportsare one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about Formation Stability Reports or any civil engineering needs.

 

  • Station Buildings

Primerail Infralabs Offers Complete Station Structural Design, layout along with Architectural Services, according to the Client Requirement.

Our Professionals use world class licensed software like Autodesk AutoCAD, Civil Cad, MicroStation, STAAD Pro etc, to deliver Quality work along with cost effectiveness and Sustainability.

Station Building Architecture & Structures are one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about Station Architecture & Structures or any civil engineering needs.

  • Track Designs

Primerail Infralabs Professional Engineers work on world Class licensed Software like Bentley Systems, Bentley Rail Track, MIDAS, Micro station, STAAD etc to Design and Analyse Tracks.

Our Scope also consists of Rail Track Gauge analysis, Rail Track regression Analysis, Design & Model Tunnels, Design Rail Track Geometry, Generate Rail Engineering Deliverables, Generate Rail Track Construction Deliverables, and Validation of rail design.

Design of Tracks are one of many Services the professional staff at Primerail Infralabs provide. Contact us for more details about Track Designs or any civil Engineering needs.

Station Architecture & Structures

Primerail Infralabs Offers Complete Station Structural Design, layout along with Architectural Services, according to the Client Requirement.

Our Professionals use world class licensed software like Autodesk AutoCAD, Civil Cad, MicroStation, STAAD Pro etc, to deliver Quality work along with cost effectiveness and Sustainability.

Station architecture & Structures are one of many services the professional staff at Primerail Infralabs provide. Contact us for more details about Station Architecture & Structures or any civil engineering needs.

Depot Layouts

The Depot facilities have to provide the Space and Equipment required to support the maintenance of the Metro Rail line infrastructures (i.e. buildings, stations and structures, track, tractive energy, overhead contact line , DC line etc) and operation systems (rail and road signalling and communications, fare collection system, video surveillance, passenger information).

The key preventive and corrective maintenance activities that must be supported are: –

For the track: visual inspections; checking of rail wear, maintenance of the draining system, and mechanical sweeping of the platform and groove of rails, snow removal, removing ice from the flange ways, maintenance of turnouts, etc.

For buildings, stations and structures: inspections and repairs, cleaning, snow removal

For the energy and overhead contact line: inspection and maintenance of substations, battery maintenance, checking wear, sag and mechanical tension of overhead contact line

For operating systems and signalling: inspections, troubleshooting fault signals received at OCC, etc.

Primerail Infralabs Offers Complete and cost effective Depot Designs and Layouts with Assured Quality.

Depot Designs and Layouts are one of many services the professional staff at Primerail Infralabs provide. Contact us for more details about Depot Designs and Layouts or any civil engineering needs.