Ageing of structures Prague meeting, October 25th 2006
CTU Prague Inspections of Prague Underground
Daniel Jirásko Line C
Line B Line A
Line A
Line B
Line C Line C Ládví Kobylisy Line B Nádraží Holešovice Line A Vltavská Malostranská Staroměstská Florenc Můstek
Line A
Line B
Line C Line A
Line A – Malostranská st. → Malostranská Staroměstská st. → Můstek st. Staroměstská •Built between 1973 -1978 •2 single track tubes Můstek •Passes bellow Vltava River •Approx. depth 30 m bellow ground surface • Constr. Method - Mechanized tunneling shield. Lining from compressed concrete •Was flooded in 2002 Line A
August 2002 Klárov – near the entrance of Malostranska station Line A - Track 1 – Ch. 19+455 km cracks with undamaged gypsum flat strips Line A –Track 1 – Ch. 19+455 km cracks with undamaged gypsum flat strips Line A - Track 1– Ch. 19+482 km – cracks, seepage, incrustation Line A - Track 1 – Ch.19+535 km – degradation or poor quality of concrete lining on the top Line A - Track 1 – Ch.19+535 km – marks of Fe and Mn incrustation Line A - Track 1 – Ch.19+535 km – detail of Fe and Mn incrustation Line C
Ládví
Kobylisy
Nádraží Holešovice Line B Line C – Florenc St.→ Vltavská St. → Nádraží Holešovice St. Line A You will visit this section tonight. Vltavská • Built between 1978 - 1984 • Passes bellow Vltava River • 2 single track tubes Florenc • Track 1 tube -"Prague" ring tunneling method with erector • Track 2 tube – Mechanized shield • Depth Florenc 9m, Vltavská 21m, Nádraží Holešovice 7m bellow ground surface August 2002 - Florenc Station Cross section of the tunnel tube with concrete tubbings Line C - Track 1– Ch.19+115 km – Horizontally cracked tubbing, seepage with incrustation Line C - Track 1 – Ch.19+115 km – Detail of cracks Line C - Track 1 – Ch.19+115 km – micro cracks Line C - Track 1 – Ch.19+105km – micro cracks Line C - Track 1 – Ch.19+100 km – horizontal cracks in 3 tubbings Line C - Track 1 – Ch. 19+060 km – Diagonal cracks on the tubbing segment Line C - Track 1 – Ch. 19+030 km – Cracks on tubbings, marks of seepage and incrustation Line C - Track 1 – Ch. 18+725 km – horizontal cracks on 9 tubbings , seepage and incrustation along tubbing segments (left side of tunnel) Line C – Ch. 18+725 km – horizontal cracks on 9 tubbings , seepage and incrustation along tubbing segments (right side of tunnel) Line C
Ládví
Kobylisy
Nádraží Holešovice Line B
Line A Line C – Nádraží Holešovice →Kobylisy →Ládví Vltavská • Built between 2000 - 2004 • Lies in the trench in the Vltava River bed • Nádraží Holešovice 7m, Kobylisy 31.5m, Florenc Ládví 7m bellow ground surface Line C
Ládví
Nádraží Holešovice
Line C – Nádraží Holešovice st.→ Kobylisy st.→ Ládví st. Steep tube 3.95% – 112 m vertical distance between Nádraží Holešovice St. and Kobylisy st. Line C
NATM – 1 Ládví double Launching tunnel track tube method – 2 single track tubes
Nádraží Holešovice Line C – Ch. 16+525 km – Cracks on the top of the concrete lining Line C – Ch. 16+400 km – Horizontal micro-cracks Line C – Ch. 16+400 km – Horizontal micro-cracks Line C – Ch. 16+260 km – Diagonal cracks on the top of concrete lining Line C – Ch. 16+250 km – Crack in construction joint Line C – Ch. 15+875 km - Cracks on the concrete base of the rails Line C – Ch. 15+875 km - Cracks on the concrete base of the rails Line C – Ch. 15+811km crack parallel to the construction joint Line C – Ch. 15+448km longitudinal micro-crack Line C – Ch. 15+425km crack along construction/shrinkage joint, damaged gypsum flat strips Line C – Ch. 15+358km crack in construction/shrinkage joint, marks of seepage Line C – Ch. 15+343km crack in construction/shrinkage joint, damaged gypsum flat strips Ageing of structures Prague meeting, October 25th 2006
Summary:
• We have seen approx. 11km of Prague underground of different age, constructed by different technologies in v arious geology conditions.
• We found and map the places where there are visible various marks of deterioration and where would be interesting to focus on further measurement.
Thanks to Dopravní podnik hl.m. Praha for cooperation. Ageing of structures Prague meeting, October 25th 2006
Thank you for your attention.