Progress Report > Package IB - South Tunnel Section

Physical Progress | Photographs | Construction Supervision

Physical Progress

Photographs

	South Tunnel Portal
	Fixing of Waterproofing Membrane
	Inspection of Double Welded Connection
	Cleaning for Foundation Beam Concrete
	Placement of Concrete for Foundation Beam
	Shotcrete for Finish
	Compacting the Foundation for Fixing Rails for Second Formwork
	Placement of Concrete Lining by the Second Formwork
	Placement of Concrete Lining by the First Formwork
	Construction of Face No.7
	Drilling of Evacuation Tunnel
	Electrostatic
	Mucking of Electrostatic Precipitator

Construction Supervision

Summary

During the reporting period 115.5m of Evacuation Tunnel and 86.32m of Main Tunnel Top Heading was excavated, giving a total length of 1918.1m of Evacuation Tunnel and 1808.82m of Main Tunnel Top Heading excavated to date.

Bench excavation continued with 43.19m being excavated on the West Side and 90.9m excavated on the East Side.

Tunnel lining continued with 199.33m of tunnel completed.

Excavation of the Electrostatic Precipitator continued with 62.36m excavated.

Excavation was down over the reporting period due to poor geological conditions in Main Tunnel, the large amount of plant breakdowns and the Tet holiday.

The Main Tunnel has now passed through the poor ground and is now advancing smoothly.

The second lining form commenced operation.

Over the reporting period time was lost against the original clause 14 construction schedule.  The Main Tunnel is five weeks behind programme and Evacuation 10 weeks.

It is predicted that excavation progress will improve over the next reporting period but tunnel lining will again be down as there is no waterproof membrane on site.

Evacuation Tunnel

A total of 115.5m of Evacuation Tunnel was excavated from St. 1+802.6 to St. 1+918.1 over the reporting period. Giving a total length of 1918.1m of tunnel excavated to date. The items carried out during the month can be quantified as follows:

Explosive:                                          7737 kg

Shotcrete 50mm thickness:                       1265.5 m²

Main Tunnel

A total of 86.32m of Main Tunnel Top Heading was excavated over the reporting period, giving a total length of 1808.82m of Main Tunnel Top Heading excavated to date.

Face No.7:  86.32m of Top Heading excavated from St. 1+722.5 to St. 1+808.82

Bench excavation: 

- 43.19m of bench excavated from St. 1+259 to St. 1+302.19 (West side).

- 90.9m of bench excavated from St. 1+260 to St. 1+350.9 (East side)

Electrostatic Precipitator: Excavated 62.36m of tunnel from Sta. 0+25.34 to Sta. 0+087.7

Tunnel Lining

Concrete for Foundation Beam –293.52m Fr. St. 0+937.5 to St. 1+231.015 (West Side)

Concrete for Foundation Beam –209.79m Fr. St. 0+948.23 to St. 1+158.022 (East Side)

Concrete for Tunnel Lining – 199.331m (17 blocks) from St. 7+396.03 to St. 7+324.21

Installation of waterproofing membrane:                             362m

          Completed 50m of drainage ditch

Bridge No. 1

          Excavation for the South Abutment:                           218 m3