Královopolské Tunnels on the Brno City Ring, supportive measures for driving works – compensation grouting - Zakládání staveb, a. s.

Královopolské Tunnels on the Brno City Ring, supportive measures for driving works – compensation grouting


Královopolské Tunnels on the Brno City Ring, supportive measures for driving works – compensation grouting

The project of Kralovopolske Tunnels in Brno required a complete set of passive measures carried out to secure the built-up area on the surface. These measures were supplemented by compensation grouting – an active measure realised within geological layers between the tunnel and foundations of the existing buildings. The principle of compensation grouting lies in carrying out grouting fields under selected buildings followed by repeated controlled high-pressure grouting realised layer by layer in succeeding phases; such grouting allows targeted vertical shifts of monitored measuring points located at the selected objects. This method may minimise deformations induced by driving. The compensation grouting was carried out from a total of seven shafts with linings made of jet grouted columns. Fans of grouting pipes reaching to the length of up to 35 m were carried out from these shafts located under the selected buildings. Prior to activation of the grouting pipes (35/5,5 mm) spread plates made of jet grouted columns were carried out from each of the shafts to ensure even distribution of compensation effects; in some places these plates had micropiles installed.

Measures

Horizontal jet grouting: 14 389 m of bores, 8 884 columns of 600 mm in diameter
Micropiles 70/12 mm: 108 m
Grouting bores diam. 90 mm: 10 042 m
Low-pressure grouting: 16 709 hr (hours of grouting)
Compensation (high-pressure) grouting: 67 175 hr

Client

Road and Motorway Directorate of the CR, Na Pankraci 56, Praha 4

Investor

Road and Motorway Directorate of the Czech Republic, Statutory
City of Brno and State Fund for Transport Infrastructure

Price

Year

19,2 mil. Eur 2007-2009



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  • Type of construction : Traffic projects
  • Country : Czech Republic
  • Financial volume : 100– more mil. Kč
  • Completion date : 2006-2010
  • Supporting technologies : Grouting,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.
K Jezu 1, P. S. 21
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ID Number: 49241567
Tax ID Number: CZ49241567

Company registered in the Commercial Register at the Municipal Court in Prague, Section B, Insert 2139.

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