Progress Report > Package IB - South Tunnel Section

Physical Progress | Photographs | Construction Supervision

Physical Progress

Photographs

	South Tunnel Portal
	Fixing of Waterproofing Membrane
	Concreting Revision Pipe
	Cleaning for Foundation Beam Concrete
	Placement of Conrete for Foundation Beam
	Drilling of Bench
	Installation of Wire Mesh for Main Tunnel
	Installation of Rockbolt for Main Tunnel
	Construction of Main Tunnel
	Drilling of Face No. 7
	Placement of Concrete for Evacuation Tunnel
	Placement of Concrete for Evacuation Tunnel
	Construction of South Abutment

Construction Supervision

Summary

During the reporting period 92.2m of Evacuation Tunnel and 132.16m of Main Tunnel Top Heading was excavated, giving a total length of 1714.38m of Evacuation Tunnel and 1677.46m of Main Tunnel Top Heading excavated to date.

Bench excavation continued with 322.3m being excavated on the West Side and 358.8m excavated on the East Side.

Tunnel lining continued with 180m of tunnel completed.

Excavation was down over the reporting period due to poor geological conditions in both the Main and Evacuation Tunnel.

Over the reporting period there was no recovery against the original clause 14 construction schedule.  The Main Tunnel is three weeks behind programme and Evacuation nine weeks.

It is expected that progress over the next month will be poor due to the poor geology and the fact that tunnel lining is suspended as there is no lining membrane on site.

Evacuation Tunnel

A total of 92.2m of Evacuation Tunnel was excavated from St. 1+622.2 to St. 1+714.38 over the reporting period. Giving a total length of 1714.38m of tunnel excavated to date. The items carried out during the month can be quantified as follows:

Main Tunnel

A total of 132.16m of Main Tunnel Top Heading was excavated over the reporting period, giving a total length of 1677.46m of Main Tunnel Top Heading excavated to date.

Face No.7 – 132.16m of Top Heading excavated from St. 1+545.3 to St. 1+677.46

Bench excavation  – 195.4m of bench excavated from St. 0+774.7 to St. 0+970.1 and  126.9m from St. 1+097 to St. 0+970.1 (West side).

– 164.35m of bench excavated from St. 0+764 to St. 0+928.35, 151.95m from St. 1+080.3 to St. 0+928.35, 42.5m from St. 1+097 to St. 1+139.5.

The items carried out during the month can be quantified as follows:

Face No. 7: Excavation of 132.16m Top Heading

          Blasting:                                                          18597 kg

          Wire mesh CQS6:                                          473m2            

          Shotcrete 50mm thickness:                           2975.72 m2

          SN rockbolt 3m:                                              70 No.

          SN rockbolts 4m:                                            186 No.

          SW rockbolt 3m:                                             31 No.

          SW rockbolt 4m:                                             120 No.

Bench Excavation

          Blasting:                                                          5708 kg

          Shotcrete for temporary support 50mm:        1381.1m²

          SN rockbolt 3m                                               6 No.

Concrete

          Concrete for Foundation Beam -223m Fr. St. 0+527 to St. 0+750 West Side

          Concrete for Foundation Beam –203m Fr. St. 0+542 to St. 0+745 East Side

          Quantity                                                           206.6m³

          Concrete for Tunnel Lining - 180m from St. 7+745.825 to St. 7+536.57

          Quantity                                                           2461.6m³

          Installation of Mole Drain:                                345m

          Installation of Waterproofing Membrane:        130m of Tunnel

          Completed 50m of drainage ditch

Bridge No. 1

          Excavation for the South Abutment:                           218 m3