Progress Report > Package IB - South Tunnel Section

Physical Progress | Photographs | Construction Supervision

Physical Progress

Photographs

	South Portal Area May 2003
	Placement of Concrete for East Cable Curb
	Inspection of Double Welding Connection
	Placement of Concrete Foundation Beam
	Placement of Concrete Lining
	Construction of Bench
	Main Tunnel Support At Station 2+124.65
	Construction of Face No.7
	Construction of Evacuation Tunnel
	Installation of Formwork for Cross Passage
	Placement of Concrete Foundation Beam for EP
	Installation of Formwork for Concrete Lining of Electrostatic Precipitator
	Drilling Cores for Checking Thickness of Support Shotcrete
	SITOC Visited the Site

Construction Supervision

Summary

During the reporting period 134.4m of Evacuation Tunnel and 138.05m of Main Tunnel Top Heading was excavated, giving a total length of 2299.9m of Evacuation Tunnel and 2259.3m of Main Tunnel Top Heading excavated to date.

Bench excavation continued with 120.5m being excavated on the West Side and 156.62m excavated on the East Side.

Tunnel lining continued with 191m of main tunnel completed and 43.77m of layby completed.

Excavation of the Electrostatic Precipitator bench continued, and 71.5m completed.

Overall a disappointing months progress due to poor geological conditions at the start of the month and then the contractor’s implementation of a new survey and drilling method which has slowed progress and increased cycle times from 17-24 hrs in the Main Tunnel.  The Main Tunnel is now 1 week behind schedule and Evacuation Tunnel 5 weeks.

Main Tunnel

A total of 138.05m of Main Tunnel Top Heading was excavated over the reporting period, giving a total length of 2259.3m of Main Tunnel Top Heading excavated to date.

Face No.7:  

- 138.05m of Top Heading excavated from St. 2+121.25 to St. 2+259.3

Bench excavation

– 120.5m of bench excavated from St. 1+713.5 to St. 1+834 (West side).

– 156.62m of bench excavated from St. 1+636.9 to St. 1+793.52 (East side)

Electrostatic Precipitator 

- Excavated 71.5m of bench from St. 0+076.25 to St. 0+147.78

Tunnel Lining

Concrete for Foundation Beam -126.02m Fr. St.1+ 553.43 to St.1+679.43 (West Side)

Concrete for Foundation Beam -161.2m Fr. St.1+ 557.1 to St. 1+718.55 (East Side)

Concrete for Tunnel Lining – 191m (16 blocks) from St. 6+466.591 to St. 6+257.555

Concrete Lining of layby 43.77m (7 blocks)

Backfill grouting of tunnel lining from block 14-36

Installation of mole drainpipe:                                            151 m             

Installation of waterproofing membrane:                             118 m

Explosive: 8930 kg 

Shotcrete 50mm thickness: 1391.7 m2 

SN rockbolts 3m: 6 No.

Access Road to Water Reservoir

Construction of drainage ditch – 158 m