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Survey holes with W80, Chikushi Tunnel, Japan


Project Description:

Construction of a 11.8 km long tunnel for the Shinkansen high speed train on the Japanese island Kyushu. The sub-contractor, New Japan Development Co., drilled 200 meter, 130 meter and 125 meter long horizontal holes for the purpose of survey and drainage. Wassara W80 was chosen for its ability to drill fast and produce straight holes. An additional advantage with using Wassara is its ability to handle water in the formation without any detrimental effects on drilling rate.


Result:

The survey and drainage holes produced by the Wassara hammers fulfilled the customers expectations to full extent.

Equipment:

Hammer

Wassara W80

 

Bit

90 mm

 

Pump

Tomec, model JS135E

 

Drilling fluid

Clean water

 

Drill pipe

Local supplier

 

Rig

Koken RPD130C

 

Formation

Granite


Project Description:

Construction of a 11.8 km long tunnel for the Shinkansen high speed train on the Japanese island Kyushu. The sub-contractor, New Japan Development Co., drilled 200 meter, 130 meter and 125 meter long horizontal holes for the purpose of survey and drainage. Wassara W80 was chosen for its ability to drill fast and produce straight holes. An additional advantage with using Wassara is its ability to handle water in the formation without any detrimental effects on drilling rate.


Result:

The survey and drainage holes produced by the Wassara hammers fulfilled the customers expectations to full extent.

Equipment:

Hammer

Wassara W80

 

Bit

90 mm

 

Pump

Tomec, model JS135E

 

Drilling fluid

Clean water

 

Drill pipe

Local supplier

 

Rig

Koken RPD130C

 

Formation

Granite