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Pre-drilling for jet-grouting with W100 in Hammarby, Sweden


Project Description:

Reinforcement work during the construction of the Southern Link highway system in Stockholm. The contractor, Hercules Trevi, first drilled a number of holes with the Wassara W100 and then switched to the jet-grouting equipment for the grouting  phase. There were two reasons for choosing Wassara:

  • The large amounts of water in the formation made the use of pneumatic hammers difficult.
  • Since it was possible to use the jet-grouting pump to run the Wassara hammer it was not necessary to have an air-compressor on site.


Result:

No problems were experienced when switching from drilling with W100 to grouting.
 

Equipment:

Hammer

Wassara W100

 

Bit

Wassara 120 mm

 

Pump

Jet-grouting pump

 

Drilling fluid

Clean water

 

Formation

Mixed, water in formation

 


Project Description:

Reinforcement work during the construction of the Southern Link highway system in Stockholm. The contractor, Hercules Trevi, first drilled a number of holes with the Wassara W100 and then switched to the jet-grouting equipment for the grouting  phase. There were two reasons for choosing Wassara:

  • The large amounts of water in the formation made the use of pneumatic hammers difficult.
  • Since it was possible to use the jet-grouting pump to run the Wassara hammer it was not necessary to have an air-compressor on site.


Result:

No problems were experienced when switching from drilling with W100 to grouting.
 

Equipment:

Hammer

Wassara W100

 

Bit

Wassara 120 mm

 

Pump

Jet-grouting pump

 

Drilling fluid

Clean water

 

Formation

Mixed, water in formation