WORKLOAD OF A BRIDGE INSPECTOR V B SOOD PROF TRACK 2

WORKLOAD OF A WORKLOAD OF A BRIDGE INSPECTORBRIDGE INSPECTOR

V B SOODV B SOOD

PROF TRACK 2PROF TRACK 2

DUTIES OF A BRIDUTIES OF A BRI

• Inspection of Steel girders including Inspection of Steel girders including bearings of girders > 12.2m – once in 5 bearings of girders > 12.2m – once in 5 yearsyears

• Welded girder – initial inspection after 1 Welded girder – initial inspection after 1 year of installation, then once in 3 yearsyear of installation, then once in 3 years

• PSC, RCC, Composite girder – initial PSC, RCC, Composite girder – initial inspection after 1 year and subsequently inspection after 1 year and subsequently once in 5 years once in 5 years

• Overstressed girders – at least once in a year Overstressed girders – at least once in a year or closer frequency as decidedor closer frequency as decided

• Early steel girder – Floor System– once in a Early steel girder – Floor System– once in a yearyear

• Camber of PSC girders – once in a yearCamber of PSC girders – once in a year

DUTIES OF A BRIDUTIES OF A BRI

• Erection of steel girders for all major bridges, PSC girders.

• Erection of workshop structures and flood light towers if ordered by the Chief Engineer.

• Accountal and periodic verification of stores, tools and plants in his charge.

• Assist the restoration of breaches and accidents on bridges.

• Supervise and measure the works of painting, special repairs including regirdering

• planning of works and labour distribution for departmental works

DISTRIBUTION OF THE DISTRIBUTION OF THE TIME AVAILABLE WITH TIME AVAILABLE WITH

SE(BRIDGE)SE(BRIDGE)The SE(Bridge) has 365 days in a year at

his disposal. The time available is distributed as below:

SE (BRIDGE) SE(BRIDGE)IN CHARGE NOT

INCHARGE

TOTAL DAYS IN ONE YEAR 365 365SUNDAYS 52 52PUBLIC HOLIDAYS 12 12STAFF PAYMENT 12 0LEAVE (AVERAGE) 30 30ACCOMPANYING HIGHER OFFICERS IN 20 20INSPECTIONSASSISTING DIVISIONS IN THEIR WORKS SUCH AS 20 20SLEEPERS SEAT PAINTING, BED BLOCK/ HOLDINGDOWN BOLT REPAIRS, REPAIRS IN MINOR BRIDGES,HEAVY ERECTION ETC

DISTRIBUTION OF THE DISTRIBUTION OF THE TIME AVAILABLE WITH TIME AVAILABLE WITH

SE(BRIDGE)SE(BRIDGE)SE (BRIDGE) SE(BRIDGE)

IN CHARGE NOT INCHARGE

MISCELLANEOUS WORKS/ WASTAGE OF TIME DUE 15 15TO FACTORS BEYOND CONTROL ETC

TRAINING 7 7ESTABLISHMENT/ STORE WORK 48 0MISCELLANEOUS MEETINGS SUCH AS HINDIMEETING, HOUSING COMMITTEE MEETING ETC 12 5TOTAL DAYS ACCOUNTED FOR 228 161NET WORKING DAYS AVAILABLE FOR BRIDGE 137 204INSPECTIONS/ MAINTENANCE

DEFINITION OF DEFINITION OF STANDARD SPANSTANDARD SPAN

The 18.3 m span steel plate girder located in moderate exposure environment, having sliding bearings, approximately 50 km from the SE (Bridge) headquarter, in a section having GMT less than 15 and being inspected conventionally is taken as basic unit on the basis of which the workload of the SE(Bridge) shall be worked out and the factors that affect the workload shall be applied on the same. This span is called standard span.

WORKLOAD WORKLOAD ASSUMPTIONSASSUMPTIONS

The time required for the various activities are assumed out as below:GENERAL INSPECTIONS: One standard span can be inspected under general inspection in 15 minutes time at the bridge. The recording of the results of the inspection requires another 15 minutes per span. Therefore in a day, 12 spans can be inspected.DETAILED INSPECTIONS: One standard span can be inspected under detailed inspection in 60 minutes time at the bridge. The recording of the results of the inspection requires another 30 minutes per span. Therefore in a day, 4 spans can be inspected.


INSPECTIONS OF WORKS such as patch painting, replacement of loose rivets, greasing of bearings, replacement/ strengthening of corroded members, etc. 20 % of the bridges are under painting every year and another 20 % in patch painting. The SE(Bridge) has to visit twice for patch painting- once for setting out the work and once for quality check. For complete painting, the SE (Bridge) has to visit the work at least five times- once for setting, once each for checking cleaning/scrapping, after various coats of painting and at the last for making measurements. The further time is required for other works such as greasing of bearings (one third i.e. 33 spans every year) and other works such as loose rivet replacement, replacement of corroded members. For the same, the workload is estimated per 100 standard spans as 10 days in a year.


Heavy repairs such as replacement/ strengthening of main members of girders, regirdering etc are not covered in this workload and for these works separate work charged organization shall be created.SPECIAL INSPECTIONS: Special inspections are to be done for distressed bridges, after major incidences such as earthquake, floods etc. In a year,per 100 standard spans, the time taken for such inspections is estimated as 5 days.

TIME REQUIRED FOR 100 TIME REQUIRED FOR 100 STANDARD SPANSSTANDARD SPANS

For 100 spans, time required for detailed inspection + time required for general inspection+ time required for inspections of departmental works/ special works excluding heavy repairs + time required for special inspectionsi.e. : (20 % of 100)/4 + (80 % of 100)/12+10 + 5i.e. : 5+6.67+10+5i.e. : 26.67 days are required per 100 standard spans.

WORKLOAD OF BRI IN WORKLOAD OF BRI IN STANDARD SPAN UNITSSTANDARD SPAN UNITS

WORKLOAD OF SE (BRIDGE) IN CHARGE: The SE(Bridge) in charge shall have a workload of (137/26.67)*100 i.e. 513.69 standard spans, say 514 standard spans.WORKLOAD OF SE (BRIDGE) NOT IN CHARGE: The SE(Bridge) not in charge shall have a workload of (204/26.67)*100 i.e. 764.90 standard spans, say 765 standard spans.

FACTORS AFFECTING FACTORS AFFECTING WORKLOAD OF BRIWORKLOAD OF BRI

•MATERIAL OF GIRDER•SPAN LENGTH (L)•TYPE OF GIRDER (T)•TYPE OF BEARING (B)•TYPE OF ENVIRONMENT (E)•LOAD CARRIED (LO)•ACCESSIBILITY (A)•DEGREE OF MODERNIZATION (M)

•AGE OF GIRDER•GAUGE (G)


•MATERIAL OF GIRDERSTEEL GIRDERS REQUIRE RIVET TESTING, PAINTING ETC WHEREAS THE CONCRETE GIRDERS REQUIRE CAMBER MEASUREMENT AND DETILED INSPECTION OF LARGER AREATHEREFORE THIS FACTOR DOES NOT CHANGE WITH MATERIAL OF GIRDER


•SPAN LENGTH (L)FOR SAME SPAN LENGTH, DIFFERENT WEIGHTS MAY BE THERE. THE INSPECTION/ MAINTENANCE EFFORTS ARE DEPENDENT ON SURFACE AREA AND NOT ON THE THICKNESS OF MEMBERS. THIS FACTOR THEREFORE VARIES WITH SQUARE OF THE SPAN, COMPARED WITH THE STANDARD SPAN LENGTH i.e. 18.3 M


•TYPE OF GIRDER (T)GIRDERS WITH FLOORING SYSTEM AND MULTIPLE LEAVES REQUIRE EXTRA EFFORTS, THEREFORE THE EXTRA WORKLOAD IS ASSUMED AS:THROUGH TYPE GIRDERSCABLE STAYED/ SUSPENSION 0.50

SEMI THROUGH PLATE GIRDER/ DECK TYPEOPEN WEB GIRDERS/ PSC I SECTION GIRDER0.25

GIRDERS CARRYING MORE THAN ONE TRACK SHALL BE CONSIDERED FOR ONE TRACK ONLY AND THE WEIGHTAGE FOR SUCH GIRDERS SHALL BE INCREASED BY 60 % i.e.0.60


TYPE OF BEARING (B)

GIRDERS HAVING ROLLER/ ROCKER BEARINGS 0.20GIRDERS BEARINGS REQUIRING ONLY CLEANING -0.10GIRDERS WITH NO BEARINGS -0.15GIRDERS REQUIRING GREASING ONCEIN TWO YEARS WHEN LWR IS TAKENTHROUGH +0.05


TYPE OF ENVIRONMENT (E)TO CATER TO THE EXTRA MAINTENANCE EFFORT FOR THE GIRDERS SUBJECT TO AGGRESSIVE ENVIRONMENT, THE EXTRA WORKLOAD IS ASSUMED AS:VERY SEVERE ENVIRONMENT 0.20 (In salt spray zone and having brackish water in stream, chemically polluted industrial area etc)SEVERE ENVIRONMENT 0.10 (Within 20 km of sea but not having brackish water in stream, polluted locations in metropolitan areas)


LOAD CARRIED (LO)TO CATER TO THE EXTRA MAINTENANCE EFFORT FOR THE GIRDERS SUBJECT TO MORE LOADS REFLECTED AS ANNUAL GMT, THE EXTRA WORKLOAD IS ASSUMED AS:

ANNUAL GMT FACTOR

UPTO 15 0.0015 TO 25 0.0525 TO 40 0.10MORE THAN 40 0.15


ACCESSIBILITY (A)

TO CATER TO THE TIME WASTED IN TRAVELLING TO AND FROM THE GIRDERS TO BRI HEADQUARTER, THE EXTRA WORKLOAD IS ASSUMED AS:

DISTANCE FROMBRI HEADQUARTERUPTO 50 KM 0.0050 KM TO 100 KM 0.20100 KM TO 200 KM 0.40MORE THAN 200 KM 0.50


ACCESSIBILITY (A) TO CATER TO THE TIME WASTED IN TRAVELLING TO AND FROM THE GIRDERS TO BRI HEADQUARTER, THE EXTRA WORKLOAD IS ASSUMED AS:DISTANCE FROMBRI HEADQUARTERUPTO 50 KM 0.0050 KM TO 100 KM 0.20100 KM TO 200 KM 0.40MORE THAN 200 KM 0.50IF MATERIAL TRANSPORT ARRANGEMENTS i.e., TRUCK, THE ABOVE FACTORS SHALL BE REDUCED BY 0.05. IF ROAD VEHICLE SUCH AS JEEPS/ TRACK VEHICLE ETC ARE PROVIDED THE ABOVE FACTORS SHALL BE FURTHER REDUCED BY 0.05.


DEGREE OF MODERNIZATION (M)WHERE THE MODERN METHODS SUCH AS THE NDT, INSTRUMENTATION ETC ARE INCLUDED IN THE INSPECTION METHODS, THE WORKLOAD OF BRI INCREASES CONSIDERABLY. THE MODERNIZATION IS VERY IMPORTANT AS PRESENT METHODS OF INSPECTION ARE NEITHER SCIENTIFIC NOR INSPIRE ANY CONFIDENCE

Depending on the degree of modernization of the inspection system, the BRI workload shall be increased by a factor upto 0.25.


AGE OF GIRDEROLD EARLY STEEL GIRDERS ARE BEING REPLACED ON PROGRAM BASIS. THE NEWER GIRDERS ARE GENERALLY CONCRETE, WHICH REQUIRE MORE INSPECTIONS THAN STEEL GIRDERS

THEREFORE THIS FACTOR IS NOT CONSIDERED TO AFFECT THE WORKLOAD OF BRITHIS ASPECT REQUIRES FURTHER STUDY AFTER THE INTRODUCTION OF CC+8+2 AND 25 T AXLE LOADS


GAUGE (G)THE GIRDERS FOR THE SMALLER GAUGES ARE LESSER IN DEPTH AND GENERALLY LIGHTER. THEREFORE THE WORKLOAD OF A BRI REDUCES ACCORDING TO THE TYPE OF GAUGE.

METER GAUGE -0.30NARROW GAUGE -0.50

FORMULA FOR FORMULA FOR WORKLOAD OF BRIWORKLOAD OF BRI

W = (L2/18.32)*(1+ T) *(1+ B)* (1+ E) *(1+ LO)* (1+ A)* (1+ M)*(1+ G)

FURTHER REQUIREMENT FURTHER REQUIREMENT OF BRIsOF BRIs

•Peculiar local conditions e.g. the NF railway where the restoration after floods is an important activity and additional BRI for the same shall be provided by calculating the average workload based on historical data.•Other works entrusted to the BRI by special orders of the Chief Engineer locally in a railway.•BRIs in headquarter office and under DyCE/Br/Line which have not been incorporated in the above formula. These are required for the streamlined system of bridge register scrutiny, to work in emergency control in headquarter in case of breaches/accidents involving bridges and for assisting the CBE/ DyCE/Br/Line in taking decisions on technical matters relating to the bridge inspections/ maintenance.

REDUCTION FACTOR FOR REDUCTION FACTOR FOR OTHER STRUCTURESOTHER STRUCTURES

WORKLOAD CALCULATED AS PER THE FORMULA GIVEN SHALL BE REDUCED BY THE FOLLOWING FACTORS FOR OTHER STRUCTURESFOOT OVER BRIDGES 75 %WORKSHOP STRUCTURES, INSPECTIONARRANGEMENTS AND OTHER STRUCTURESEXPOSED TO ATMOSPHERE. 50 %WORKSHOP STRUCTURES INSIDE COVERED SHED 60 %

DATA VALIDATIONDATA VALIDATION

FOR BCT DIVISION IN WESTERN RAILWAYIN CHARGE BRIs 3 NOS AND 0.43 NON INCHARGE BRIs ARE CALCULATED. THIS CORRELATES WELL WITH THE 4 BRIs IN BCT DIVISION AS PER CADREFURTHER DATA VALIDATION IS REQUIRED

NEW DEVELOPMENTS NEW DEVELOPMENTS AFFECTING THE FORMULAAFFECTING THE FORMULANEW DEVELOPMENTS THAT WILL AFFECT THE FORMULA GIVEN:•USE OF MOBILE INSPECTING CAR•USE OF REMOTE MEASUREMENT OF STRESSES

RECOMMENDATIONSRECOMMENDATIONS

•FORMULA SHALL BE VALIDATED ON SOME OTHER DIVISIONS•WORK TIME STUDY MAY BE DONE TO VALIDATE THE ASSUMPTIONS•MODERNIZATION OF THE BRIDGE INSPECTIONS IS BEING DONE, ADEQUATE STAFF SHALL BE POSTED AS CALCULATED BY THE FORMULA•SYSTEM OF GENERAL INSPECTIONS SHALL BE INTRODUCED ON ALL RAILWAYS

RECOMMENDATIONSRECOMMENDATIONS

•OTHER WORKLOAD SUCH AS FOUNDATIONS, SUBSTRUCTURE, PROTECTION WORKS ETC SHALL BE CALCULATED AND THE POSTING OF THE IOWs/ BRIs SHALL BE POSTED ACCORDINGLY•A STUDY FOR THE REQUIREMENT OF THE STAFF AS PER THE CURRENT SYSTEM OF WORKING IS REQUIRED FOR THE POST CREATIONS

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WORKLOAD OF A BRIDGE INSPECTOR V B SOOD PROF TRACK 2