Clearances Details

8/2/2019 Clearances Details

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D E P A R T M E N T O F T R A N

RAILWAY CONSTRUCTAN D OPERATIONREQ'UIREMENTS

STRUCTURAL AN D ELEC


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0 rown copyright 1977First publidmi 1947Third Edition 1977


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CONTENTS


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1. INTRODUCTION

1.1 These Requirements specify the structura l clearancoil new lines, and on existing railways where new struexisting structures a re mo dified o r where clearances ar


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2. S T A N D A R D D I M E N S I O N SS T R U C T U R A L C L E A R A N C

2.1 Definitions2.1.1 Static Load GaugeThe maximum permitted cross-sectional dimensions applicable, their loads when at rest and located central


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width of 2820 mm) runnin g on straight an d level track hgauge of 1432 mm. The diagram also shows, for starailways, a standard structure gauge which should be and for new or reconstructed works on existing rairectangle, 4640 mm high (measured abo ve designed railfo r doub le tracks (4680 tnm for a single track), which railway operational equipment and structures, and toparagrap hs 2.3.2. a nd 2.3.3. below. W here the railway on the overhead system, or is likely to be so electrifiedistance betweeu the designed rail level an d the undersidiucreased, preferably t o 4780 mm o r more, if this can beeconomy. In a few cases such increased clearance may b


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2.3.2 After allowing for the effects of curvature, inclulateral clearance between the widest portion of the kinfixed structure between rail level an d th e can trail level 3415 mm above rail level on standard gauge railway675 mm, save only:(a) Below platform levc1 (915 mm above rail level on where station platforu~ opings, bridge girders, grorailway opera tional structorcs lnay encroach to clearance of 50 m m outside the kinem atic envelopc.

be permitted between a djacent tracks.(b) In the casc of signal posts a n d o the r isolatcd stru


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3. E L E C T R I C A L C L E A R A N

3.1 Application3.1.1 These requirements apply t o co nstruction or altera tious o r add itions t o all electrified lines, including


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Electuical Cleauanccs3.2.2 The clearances required in paragraph 3.2.l(a) and categories:

* Static clearance, defined as the minimum distance reparts of the overhead equipment (under any per~n ai nt em nc e nd when not subject to uplift from6 structure or the earthed parts of the overhead equip

Passing clearance, defined as the minimum distanceparts of the overhead eq uipment an d any earthed m abetween the pantograph and any earthed material,


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3.2.5 Upli/t of the overhead equipment during the pwhere less than No rm al clearances apply, shall not exUnd er Rcduced clearance conditionsUn der Special Reduccd clearance conditions

3.2.6 The allowance for the luteml m o~ w ne ntslvity) ofRailways' rolling stock is as follows:Lateral (each way) sway of pantograph at a hei4300 mm above railEx tra per metre add itional height

Where dynamic movcments differ from the foregoing,


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3.2.9 A de finition of the kiiiernatic loadgau ge is given inRequirements. For the purpose of determining verticalheight may be taken as the sum of the height of thcvehicle bounce. T he norm al m aximum static load gaugeon the overhcad system on British Railways is 3990 nvehicle bounce is 25 nnn. Wl~erehese valoes differ ashould be made.3.2.10 Limiting values of the i'ertical clearance for Spccial Reduced clearance conditions between the undthe kinematic load gauge, based on the precedingdiagratnmatically in A~:nexure B (for 25kV AC) and A


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lines electrified a t 25kV AC is 4640 mm . G rea ter clearato 4780 mm or more, is desirable where it can be aeconomy in ord er to perm it greater flexibility in theequipment; it may be essential to provide such increplaces, for example where the overhead eq ui p~ neprcsence of switches and crossiugs or on t he ap pro achHea(lvoom at Level Crossings3.2.14 T he m inimum height a t public level crossings belowest portion of the overhead equipment under ttemperature and loading is to be:


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4. REFUGES

Provision4.1 Refuges are to be provided in all tunnels, unless ththet staffcan sta nd in safety durin g the passage of train


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Dim cnsio~is nd C onstruciion4.7 T he niinimtnn d iinensio ~ls f refuges are to be:

Heigh t 2000 lnrnWidth 1400 mmDepth 700 mni

4.8 The floor level of reruges should uot differ substathe lineside walkway unless special means of access refuge must be kept clcar of cables, pipes or other ob4.9 Refuges are to be provided with handholds to assbalance during the passage of a train. Handholds sho


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. . .1. The kinematic envelope is defined ,n paragraph 213 of the Requirements.2 The diinensions shown in red are mandatory. Dimensions shown' in black aredependent on the load gauge and the kinematic envelopederivedtherefrom, andmay vary.3. The kinematic envelope shown is that applicable to British, Railways vehicles(having a maximum static load gauge width of 2820mm) running on track witha nominal standard gauge of 143 2 mm and maintained to full normal tolerances.4. The clearance dimensions given are valid for straight an d evel track only.Due allowance must be made for the effects of horizontal and vertical cuwature. . , 7 .including superelevation, and fo r possible increments in the dimensions of the ! C

: I . . dkinematic envelope (see paragraph 2121 ::5. The Standard Structure Gauge allows for overhead electrification at voltagesup to 25kV. However, to permit some flexibility in the design of the overheadequipment the minimum dimension between rail level and the underside of 1''structures should be increased, preferably to 47 80 mm, or more, if this can be ..achieverkwith reasonable economy. In a few cases such increased clearancemay be essenta : .see paragraph 3.2.13 o theRequirements.6. Clearances given are applicable for speeds not exceeding 200 km/h.7. Permissible infringements, above rail leve, in respect of conductor railequipment guard and check ra s, trainstops; and structures in the space1 between adjacent tracks, are not shown.

I 8 The track spacing-is to be increased for additional running lines or between1 running lines. and sidings: see paragraph 2.6 of the Requirements for details.! 9 Where lineside structures are more than 40m in length, refuges may berequired: see.section 4 of the Requirements or detas.

STANDARD STRUCTUREwa gram illustrating lateral and overhead clearanceor reconstruction and for alterations or additions t

All dimensions in millimetre

Nearest face O signalisolated structures less than 2m inlength but excluding mans carryingoverhead line.equippnt o electrified.- .,railways

l 2185 W234 0 340 0 L7

Centre Line of Track


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REDUCED CLEAR1. NORMAL CLEARANCESWIT H FULL TOLERANCES

2. NORMAL CLEARANCESWlTH CLOSE TOLERANCES

P a s s i n g ~ k a r a n c e

Pass i ng C l earance in 200

Tol erance

Upl i f tConst ruct i on Dept h 120 p i i f t --

Tol eranceD e s i g n e d C o n t a c t W i r e L e v e l"Tol erance A

C o n s t r ~ c t i o n e p t hD e s i g n e d C o n t a c l W i r e L e v e l-v

Toi erance -F--Passi ng C l earance

Track To i crance i Sco No te Gi --Passi ng C i earvnce M 200 Pass i ng C l earance

Track To l erance (See Note G1 -A 26. 44%--Ki nem at i c Load Gsuge-Norm al BR Hei ght 401 5* i num al i c Load Gauge-Norm al B17 Hei ghti nem at i c Load Gauge-Norm al BR Hei ght 4015kb _._d________D e s i g n e d R a i l L e v e l -7 D e s i g n e d R a i l L e v e l3-Desi gned Rai l l . cvc l -F"

Desi gned Rai l Leve i 1 ~~ . IAt Support s

Hei ght o f S t r i ~ ct u i e bove4 7 8 0I-- --


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1. N OR M A L C L EAR A N CESWITH FULL TOLERANCES

Tolerance- 4Construct ion Dcpth ! oD e s i g n e d C o n t a c t W i r e L e v e l 'X iTolerance

Passing Clearance MW 100

'Track Tolerance ISeu Nole G)-- L-- 25 UKinematic Load Gai tgu-Normal OR i ie ight 44015-De s i g n e d i 7 u i l L e ve l ---v

l A t S ~ p p o r t s l 4580He i g h t of Structure above

2. N OR M A L C L EA R A N C ESWITH CLOSE TOLERANCES

Passing Clearance

Upl i f t

Tolerance -AConstruct ion Depth 120 (Sec Na!c D1D e s i g n e d C o n t a c t W i r e L e v e l -%

/

Tolerance2 i oPassing Clearance

--/Track To lerance ( S ee Note G) 2

Kinemat ic ILoud Gauge-Normal an Height 4 0 1 5

De s i g n e d Ra i l Level --v

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