Date, time & venue 
2012-10-13;9:15 - 12:00;Meet at entrance to Broadway Cinema at The Cyberport Arcade

Project Highlights

HATS Stage 2A Sewage Conveyance System (SCS) project involves the construction of a network of interconnected sewage tunnels and vertical shafts for the conveyance of sewage from the northern and southwestern parts of Hong Kong Island for centralized treatment at the Stonecutters Island Sewerage Treatment Works.  There will be a total of 21km of deep tunnels with depths varying from 70m to 160m below sea level under the project. Contract DC/2007/24 forms part of HATS Stage 2A SCS project and includes the construction of five deep shafts excavated through soil and rock stratum and construction of about 7.5km of tunnels from Aberdeen to Sai Ying Pun by drill and blast techniques. Attendees to this technical site visit will have an opportunity to gain insights into the ongoing construction works. Site walk will be limited to ground level and no entry to tunnel/shaft will be arranged in this site visit.

Gathering Point

Meet at entrance to Broadway Cinema at The Cyberport Arcade (see Map in the attached file). 

We will enter the site as a group.  Latecomers will NOT be entertained.

Rundown

09:15 – 09:30   Gather at Broadway Cinema at Cyberport The Arcade

09:30 – 09:45   Enter the Site as a Group

09:45 – 11:00   Presentation of the project by AECOM RSS and the Contractor + Q&A Session

11:00 – 11:45   Site tour and group photo

11:45 – 12:00   Distribution of CPD certificates

Safety Equipment

Participants must bring along their own safety helmets, safety reflective vest, safety shoes and a valid Green Card (or HKIE Corporate Membership Card) if available

Remarks

If any successfully enrolled participant does not turn up on the date of site visit without good reasons, his/her right to enroll HKIE Civil Division site visits will be suspended for 3 months after the date of the captioned site visit.

Enquiry

please contact Ir. Ian Chung / Ms. jenny Chui at Tel: 3922 9845 or Email: jenny.chui@aecom.com

Registration

The event is free of charge. The number of participants is limited to 20 on a first-come first-served basis.

As of 4:35pm of 10 October 2012 the number of applicants exceeded the capacity. On-line registration is CLOSED.

Successful applicants will be notified by emails.

Report

By Ir Kwan F.C. Chi

A technical visit to the HATS Stage 2A at Cyberport organized by the CV Division was successfully held on 13 October 2012.

HATS Stage 2A involves the construction of a network of interconnected sewage tunnels and vertical shafts for the conveyance of the currently discharged preliminary treated sewage from the northern and southwestern parts of Hong Kong Island to Stonecutters Island for proper treatment; and the expansion of Stonecutters Island sewage treatment works to provide centralised chemical treatment for all sewage from the whole of the HATS catchment.   

Works in Contract No. DC/2007/24 included the construction of deep shafts at five locations, namely Aberdeen, Wah Fu, Sandy Bay, Cyberport and Sai Ying Pun, and approximately 7.5km long of tunnels between Aberdeen to Sai Ying Pun by drill and blast method.  The construction works commenced in July 2009 and is expected to be completed in 2014/15.

The visit started with an informative presentation by Ir Sidney Wong, SRE (Geo) of AECOM Asia Co. Ltd. and Ir Philip Daynes, Design Manager of Leighton-LNS JV to introduce the overall scope of work, current construction progress, detailed construction sequences and major challenges of shaft and tunnel excavation with particular attention to the probing and grouting technique.  An interactive Q&A session was held after the presentation and the area of focus covered construction of tunnel lining, site safety and access, water ingress, and mucking out of excavated materials.

The participants were then led to the 80m deep drop shaft at Cyberport site. The excavation of both shaft and tunnel are carried out inside a noise enclosure to minimise the noise nuisance to the neighborhood.  It was a great experience for the participants to closely observe the excavation works surrounding the shaft and to appreciate the shaft access safeguard procedures including signing in-and-out, CCTV monitors and tracking system. 

After the site visit, the site team further answered some questions from the floor concerning works procedures, future maintenance, site constraints and problems encountered during construction, such as working in confined space, including emergency measures, adverse geological conditions and ground treatment methods to ensure tunnel stability.

Finally, we, on behalf of HKIE and the participants, would like to express our sincere thanks to the site supervision team and Contractor’s representatives for their kind arrangement of this valuable visit, hence that participants gained a good understanding of deep shaft construction and tunnel excavation of HATS Stage 2A Works.

Photo of the Event

Please visit album 20121013 HATS2A