Lukket drenering (BLIX)

Gjelder følgende:

- Drensrør fra TP-er til TBM tunneler.

- Drensrør fra TP Km 12.355 til TBM (OB) tunnel.

- Drensrør fra TP Km 10.662 til TBM (IB) tunnel.

- Drensrør fra toppunkt i Tunnel 1 til TP Km 10.662 og inn i hovedovervannrøret.

- Sentral overvannsledning i TP Km 3.235.

- Sentral overvannsledning i TP Km 11.585.

- Andre drensrør som er oppført som "more critical" i tabell i vedlegg 04.

According to UFB-30-Q-65503_rev.01E The Follo Line project, EPC TBM. FMECA report for the Drainage System ¿[R4]:

- Section 5.3. Overview of preventive maintenance activities with 

Maintenance shall be performed according to list of less critical and more critical areas. A preliminary list of less critical and more critical areas can be found in the FMECA report. Maintenance routine and interval cannot be finalized until the results from the flushing process and testing of tablets for the drainage system are ready.

Relevant areas identified:

Regards to limestone deposits:

- CP Km 10.6620 – pipes in CPs and main drainage around CP

- CP Km 11.1420 – pipes in CPs and main drainage around CP

- Between CP Km 11.1420 and CP Km 11.5850 – pipe KU-LKG-004166

- CP Km 7.9850 – pipe KU-LKG-005819

- Between CP Km 4.6250 and TBM tunnel – pipe KU-LKG-005825

- CP Km 3.2340 – DN 75 pipe

- CP Km 22.3840 – perforated pipe under the slab of the manhole

-Close to CP Km 20.5150 – Top of the DN 315 pipe

- CP Km 20.0350 – main drainage

- Between CP Km 20.5150 and CP Km 20.0350 – DN 75 pipe KU-LKG-007624

- Between CP Km 19.5550 and TBM tunnel – pipes behind the lining (<150 mm)

- Between CP Km 19.075 and TBM tunnel – pipes behind the lining (<150 mm) and pipe between CP and TBM tunnel

- CP Km 13.3150 – pipes in CP

- CP Km 12.8350 – pipes in CP

- CP Km 12.3550 – pipes in CP and pipes behind the lining (<150 mm)

- TBM tunnel 4 OB – DN 75 pipe KU-LKG-007789

- CP Km 18.1150 – pipes in CP

Regards to low or opposite inclination and water flow:

- CP Km 3.235 – storm water pipe

- CP Km 11.5850 – storm water pipe

Regards to remains of cement (list might be updated when cement is removed):

- CP Km 12.1520 IB – Square form sediment inside pipe KU-LKG-005846

- CP Km 14.7550 OB – Large object blocking almost all pipe KU-LKG-006979

Maintenance shall be performed according to list of less critical and more critical areas. A preliminary list of less critical and more critical areas can be found in the FMECA report. Maintenance routine and interval cannot be finalized until the results from the flushing process and testing of tablets for the drainage system are ready.

As the drainage system is different than other drainage systems used in railway tunnels today, generic routines cannot be used. Therefore, experience from testing of tablets and flushing is critical.

Maintenance shall be performed according to list of less critical and more critical areas. A preliminary list of less critical and more critical areas can be found in the FMECA report. Maintenance routine and interval cannot be finalized until the results from the flushing process and testing of tablets for the drainage system are ready.

As the drainage system is different than other drainage systems used in railway tunnels today, generic routines cannot be used. Therefore, experience from testing of tablets and flushing is critical.