Underground line V. A – track section Dejvická–Bořislavka (SOD 02) - Zakládání staveb, a. s.

Underground line V. A – track section Dejvická–Bořislavka (SOD 02)


Underground line V. A – track section Dejvická–Bořislavka (SOD 02), securing the access tunnel Kanadská (SO 02-29/02)

In the course of construction works on the Prague Underground V.A line it was necessary to carry out a driven access tunnel to connect the E1 foundation pit nearby Kanadská Street with the underground track tubes lead under Evropská Road. This tunnel was designed to enable manipulation with TBM boring shields and pulling them out to the surface. Due to existing geological conditions, low tunnel overburden as well as its required diameter, usual driving procedures were practically impossible to be used. Therefore, prior to driving works it was necessary to design extensive and complicated remediation of the soil environment based on the use of jet grouting technologies.

The following features had to be realised:
- closed vertical cut-off walls made of jet grouted columns, carried out from the surface and fixed into bedrock,
- horizontal protective envelopes made of jet grouted columns, reinforced by micropiles above the future tunnel vault and carried out step by step during driving works in the underground area,
- horizontal securing of the tunnel face with jet grouted columns using fiberglass anchors, also carried out step by step in the course of driving works.
The Kanadská access tunnel is an extraordinary construction due to many reasons, namely:
a) adverse geology (saturated backfills and deluvial clays environment),
b) the scope and structure of driving technologies used,
c) limited tunnel overburden along with the necessity to keep the thoroughfare above the driven tunnel running,
d) large cross section of the driven tunnel (14 m) and the length of secured horizontal sections (17 m).

Amounts and dimensions

Drilling together: 10 931 m
Cut-off wall and securing envelope jet grouting dia. 900 mm: 3342 m
Horizontal vault securing jet grouting dia 600 mm: 2463 m
Minipiles 114/10: 1845 m
Glass fibre anchors: 2674 m
Grout: 2076 m3

 

 

 

 

 

 

 

Client

Association of leading construction companies Metrostav, Co. and Hochtief CZ, Co.

Investor

Prague Public Transport Company Co., Sokolovská 217/42, Praha 9-Vysočany

Price

Year

4,41 mil. EUR 2011 – 2012



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  • Type of construction : Traffic projects
  • Country : Czech Republic
  • Financial volume : 100– more mil. Kč
  • Completion date : 2011-2015
  • Supporting technologies : Jet grouting

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Zakládání staveb, a. s.,
Dobronická č.p. 1371
148 26 Praha 4

 

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Zakládání staveb, a. s.
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ID Number: 49241567
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Company registered in the Commercial Register at the Municipal Court in Prague, Section B, Insert 2139.

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