A Study on Cases of Adjusting Cant over the Cant Deficient Section

Caused by the Application of Track Improvement Work

Kwang-Eun Kim†, Sam-Hyeok Choi*, Hee-Wan Oh**, Yoon-Suk Kang***, Yong-Gul Park****

Abstract At the time of opening, 81% of mainline tracks of Seoul Metro were built with ballasted tracks due to limited technical capability, construction cost and construction period. All the ballasted tracks have been promoted to replace to slab tracks due to its deterioration of track function resulting from the wear of ballast by abrasion and fragmentation by long-term use and its requirement of higher maintenance cost and more frequent repairs and maintenance. In this study, in order to apply the appropriate cant suitable for real site condition when improving tracks, the relationship and effect of rail wear before and after adjusting cant have been analysed by taking the curves of tracks and driving speed into consideration.

Keywords : Roadbed improve, Cant, Rail wear, Curved section, Track irregularity

1~4 2004 7

2,3,4R=241~499m

10 Data

R=13 1m20m

Fig 1 Comprehensive inspection car rail wear measurement

1~4 2004 R200~R499 5km/h .

.

, . C : , R : , V : ( ), : (0~100mm)

1979.5.9 1025 11 1

160Table 1

0~40

Table 1 Cities railway(Seoul Subway) cant set standards

1 2,3,4 5,6,7,8

C=10×

C�160

C�160 C' = 0-75

C' = 40

C�160 C' = 0-75

C' = 40

C' = 0-75

C' = 40

C' = 0-75 C' = 40

C' = 0-100 C' = 40

Table 2 . R 241 R499 13~65mm .

)100~0(8.11 1

2

mmCRVC ���

RV 2

'3.112

CRVC ���

'3.112

CRVC ���'3.11

2

CRVC ��� '8.11

2

CRVC ���

'8.112

CRVC ���

C'=0~100mm , C'=40mm C 30mm

. , 3~12mm .

Table 2 Seoul Subway cant deficiency status

(m) (km/h) (mm) (mm) (mm)400 75 166 110 56

400 75 166 110 56

497 75 134 80 54

499 75 133 68 65

499 75 133 92 41

241 55 148 135 13

256 60 166 126 40

399 70 145 90 55

250 60 170 130 40

249 55 143 130 13

, , , .

,

. Fig 2 .

Fig 2 Pitting underground double track structure dimension table

Table 3 Cant underground double track structure adjustment before and after pitting Specification Table

(L=600×C)

W=24,000/R (qc) (qe)

S=2,250/R (h)

(a=W+qc+S

(a=W-qe

A B A' B' E H

R km/h C m

250 60 123 74 96 350 103 9 128 455 0 2,560 2,200 2,660 2,100 4,760 5,380

250 60 143 86 96 407 120 9 149 512 0 2,610 2,200 2,712 2,100 4,760 5,399

- - +20 +12 - +57 +17 - +21 +57 - +50 - +52 - - +19

, Table 3 R=250m , 20mm 57mm, 17mm

, ,

(Fig 3) 0~75mm .

.

.

. 2004 (5km/h) ( ) 3~12mm ,

Fig 3 Cant deficiency Fig 4 Laying cant and balance cant

Fig 4 . , ,

.

, 4 / Fig 5,6 /

2~7 . Fig 5 250m( , 50kg ) ,

( , 60kg ) 0.6~0.9mm Fig 6 ( ), .

Fig 5 Cant rise before the rail average wear Fig 6 Cant rise after the rail average wear

, .

) .

. )

.

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report, Civil and Track Design