CROSSTOWN LRTConstruction Liaison

CommitteeAugust 8, 2017

Agenda

• Fairbank Station

• Oakwood Station

Fairbank Station Aerial View

Main Entrance

Service Building

Secondary Entrance

How We’re Building Fairbank Station:

Support of Excavation – Top Down

• Also known as ‘shoring’ or ‘piling’, support of excavation is a common step in the process of constructing a building.

• An area the size of the station’s footprint (about 100m x 20m) called the ‘station box’ is cut, steel piles are installed around the perimeter, a shallow area is excavated, and braces and tie-backs are installed at the sides to support excavation.

• A concrete roof slab is constructed and placed over top of the excavated area, restoring traffic while crews work safely underground.

• Support of excavation at Fairbank Station will take approximately 1.5 years to complete

Fairbank Station Construction Update

Complete

Demolition at the Service Building

Installation of geotechnical monitoring equipment

Telecommunication utilities relocation

Piling at the Main Entrance and Service Building

Hydro utilities relocation

2017

• Continue piling on the north side of Eglinton Ave W

• Continue wet utilities relocation work on Eglinton Ave W

• Implement traffic staging on the south side of Eglinton Ave W and commence piling

Current Construction Staging

Construction Progress Pictures

Construction Progress Pictures

Construction Progress Pictures

WATERMAIN CUT-AND-CAP

WORK

Construction Progress Pictures

GUIDEWALL CONSTRUCTION

Construction Progress Pictures

PILING NORTHEAST STATION BOX

Oakwood Station Concept: Aerial View

Main Entrance

Secondary Entrance

*60% rendering

Accessible Entrance

The main entrance and technical box are designed with an art feature to animate and highlight the view from Oakwood Avenue.

Oakwood Station Concept: Main Entrance

Outdoor bicycle parking

On-street connections to

TTC Buses

Oakwood Station Concept: Secondary Entrance

Outdoor bicycle parking

How We’re Building Oakwood Station:

Support of Excavation

• Oakwood Station is being constructed using a mined method known as Sequential Excavation Method or SEM. The first stage is support of excavation.

• Support of excavation (shoring) is a common step in the process of installing the foundation of a building.

• In the first stage, crews will install steel piles around the perimeter of the entrance. This has been completed at both entrances.

• In the second stage, crews excavate the area level by level, installing braces and tie-backs as they progress. This work is underway at the main entrance.

• Mining occurs from inside of the excavated main entrance after the support of excavation is complete.

• The underground area to be excavated is divided into manageable segments and the segments are excavated in a planned sequence.

How We’re Building Oakwood Station:

Sequential Excavation Mining Method

• Within the mined area, the station box is constructed accommodating the rail tunnels, associated platform and rail infrastructure.

Oakwood Station Construction Summary

2016

Geotechnical Investigation completed

Demolition 1578-1584 and 1611-1619 Eglinton Ave W completed

Stage one of long-term closure (main entrance)

Support of excavation (shoring) work started at Main and Secondary entrances

Temporary traffic signals installations

60% design completion

2017

Piling operations completed at both entrances

Temporary power works completed (Civil works completed, energization pending crane assembly)

2016 Progress

Oakwood Station Construction Lookahead

August/September 2017• Excavation at main entrance - underway• Geotechnical Instrumentation and Monitoring Plan (phase 2 installations ) –

ongoing periodically • Overhead crane assembly at main entrance - underway• Site service connections (water & sewer) - upcoming

– Starting August 14st

– Some overnight work to reduce impacts at intersection• Stage 3A set up late August/early September 2017 (Staging under review) • Dewatering wells installation on the sidewalk along Eglinton (south and north

side)

2017• Utilities Protection (Sewer lining and replacement, work on the watermain)• Mining work late 2017 (from main entrance)

Site Service Connections

Dewatering System Installation & Operation

• The term “dewatering” means pumping from the ground water at a site where there will be excavation.

• Wells will be drilled in the ground and will be connected above ground in the area required.

• System will operate for the duration of construction (2020).

Oakwood Stage 3A Revised

2017 - 2020

Progress Picture

Progress Picture

Progress Picture

Local Area Map