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Pre-drilling for jet grouting with W100, Stockholm, Sweden


Project Description

As a part of the construction work of Södra Länken, a new high-way link south of Stockholm, a grout curtain made up of 128 jet columns was created. The purpose of the grout curtain was to avoid infiltration water from leaking into the rock tunnels of Södra Länken at Nobel Valley. Wassara was considered the most suitable technical choice. The choice was based on the fact that the formation consisted of moraine with high water flow, high requirements on minimal impact on surrounding formation as well as with regards to the drilling capacity. Finally, the jet grouting work was performed with a so called ”single-system”.

 


Result
:

The project was completed according to given frames with respect to minimal impact on surrounding formation as well as the impermeability of the grout curtain.

 

*Published with permission from Golder Associates AB
 

Equipment:

Hammer

Wassara W100

 

Drill bit

Wassara 115 mm

 

Jet injection pump

Metax MP 7 for both pre-drilling and jet grouting

 

Drilling fluid

Clean water from fire post

 

Drill string

89 mm jet injection pipe

 

Rig

Hütte HBR 201

 

Formation

Moraine with high water flow

 

Commissioner

Swedish Road Administration

 

Contractor

Züblin Spezialtiefbau GmbH

 

Planning, Management and Quality Control

   Golder Associates

 


Project Description

As a part of the construction work of Södra Länken, a new high-way link south of Stockholm, a grout curtain made up of 128 jet columns was created. The purpose of the grout curtain was to avoid infiltration water from leaking into the rock tunnels of Södra Länken at Nobel Valley. Wassara was considered the most suitable technical choice. The choice was based on the fact that the formation consisted of moraine with high water flow, high requirements on minimal impact on surrounding formation as well as with regards to the drilling capacity. Finally, the jet grouting work was performed with a so called ”single-system”.

 


Result
:

The project was completed according to given frames with respect to minimal impact on surrounding formation as well as the impermeability of the grout curtain.

 

*Published with permission from Golder Associates AB
 

Equipment:

Hammer

Wassara W100

 

Drill bit

Wassara 115 mm

 

Jet injection pump

Metax MP 7 for both pre-drilling and jet grouting

 

Drilling fluid

Clean water from fire post

 

Drill string

89 mm jet injection pipe

 

Rig

Hütte HBR 201

 

Formation

Moraine with high water flow

 

Commissioner

Swedish Road Administration

 

Contractor

Züblin Spezialtiefbau GmbH

 

Planning, Management and Quality Control

   Golder Associates