Construction and Demolition Waste Conference 2017.

Construction and Demolition Waste Conference 2017. WASTE MANAGEMENT: OISIN HOUSE, TRINITY COLLEGE, DUBLIN 2.

SPEAKER: LIAM HOGAN, HEGARTY DEMOLITION LTD

Contents Introduction

◦ Project Background ◦ Project Waste Management Plan

◦ Waste Streams

◦ Waste arising Breakdown

◦ Recycling Targets

◦ Time-lapse Media

Introduction

Hegarty Demolition Ltd is a widely known name within the Construction industry in Ireland with almost 40 years experience

We have dealt with a complexity of projects ranging from design to completion. Our company offers a complete service, delivering the highest quality product while adhering to all environmental and health & safety regulations.

Our portfolio details us as a company that has been involved in the majority of Dublin’s most high profile projects over the past 40 years.

Our aim is to provide the same levels of specialist advice and innovative problem solving expertise to every contract under our care.

Liam Hogan – Managing Director

Hegarty Demolition Ltd

Project Background

In late 2016 Hegarty Demolition were awarded the contract to demolish Oisin House “a five-storey over basement 1970s office block” situated in the heart of Dublin’s busy city centre. It was being demolished as part of an overall development by Trinity College Dublin.

Oisin House was a 5 storey over basement office block built in the 1970’s which consisted of a Reinforced Concrete Floors with Lift/stair cores onto Load bearing pre-cast panels on all elevations.

It was a typical city centre project with the challenge of busy adjoining streets both pedestrian, vehicular and very little working space around the site.

Project Waste Management Plan Hegarty Demolition developed a site specific waste management plan which is mandatory to comply with planning conditions and must be submitted to the city council’s office prior to commencement on site.

The Waste management plan identified the main waste streams as listed:

◦ Reinforced Concrete ◦ Concrete Blockworks/Masonary ◦ Timber ◦ Steel ◦ Plasterboard ◦ Ceiling Tiles ◦ Carpets ◦ Glass

A pre-demolition Asbestos survey was carried out and established that there was no asbestos present on site.

Project Waste Management Plan Part of the waste management plan we use a daily waste dispatch log which tracks and controls the removal and transport of all wastes once they leave site.

Date &

Time

Docket

Ref No.

EWC Code Driver Name/

Vehicle Reg

Site Area

Location/Grid

Reference where

waste being

removed from

Skip Size &

No. of (e.g. 4 X

11001, 6CY,

14CY, 20CY,

35CY)

Waste Type (1 only)

(Contaminated Soil,

Inert Soil & Stones, Mixed, C&D, Wood,

Metal, Cardboard,

Canteen, Paper, Dry-

Recyclables,

Plasterboard, etc)

Haulage

Company/Wast

e Carrier (Full

Company Name)

Waste Facility

Destination

Company (Full

Company Name)

Any

Additional

Comments

weights

Project Waste Management Plan

Our Aim is to recycle all arisings i.e. “ZERO WASTE TO LANDFILL”.

As Concrete makes up over 90% of the waste it is essential that the building is completely free of soft strip material prior to mechanical demolition.

This enables the concrete arisings to be suitable for crushing and re-use.

Project Waste Management Plan

Soft Strip:

The Structure was stripped back to shell and core.

Ceiling Tiles, carpets, doors, frames, plasterboard, partitions and miscellaneous fixtures and fittings were removed.

Segregation of the main elements such as steel, timber, plasterboard took place on site.

Those materials were loaded into separate waste bins and removed to a recycling facility.

Waste such as ceiling tiles, carpets, insulation were loaded on to mixed waste skips and collected by a private waste disposal company and taken to their waste transfer station where they were sorted into their various waste streams and then transferred to their final recycling destination.

Project Waste Management Plan •Timber is shredded and used in renewable energy.

•Metal is sent to be crushed and baled and exported and it is melted and reused in the metal industry

•Plasterboard is recycled and used in the agricultural industry as a soil conditioner and is spread on the land as it is high in Sulphur and calcium. It is also used in the cement industry, it slows down the drying process in the cement in the hot weather.

•Glass is crushed and used in the making of Concrete blocks.

Project Waste Management Plan

Concrete Crushing:

Following Mechanical Demolition the concrete arisings were further processed on site using pulverisers fitted to 25 Tonne Excavators. Rebar was removed, collected by a special magnet attachment fitted to an excavator and sent to a metal recycling facility.

The Concrete was then crushed using a 40 Tonne Pegson city mobile crusher processing remaining rebar as it passed through and collected by a secondary conveyor with magnet attachment.

All crushed material was suitable for re-use on site to provide piling platforms and make up levels for follow on works.

Project Waste Management Plan Roadblocks to recycling/re-use.

- There is no “end of life” status for processed concrete. This Prevents its re-use as a suitable fill material on construction sites other than the site where it is generated from.

- Due to the requirements for C.E Certification second hand steel cannot be re-used in new construction projects.

- No requirement for designers to incorporate second hand materials in new construction projects.

Project Waste Management Plan

Waste Streams Breakdown Concrete Arisings 9,300 Tonnes - 93.35%

Plasterboard 67 Tonnes - 0.67%

Timber 35 Tonnes - 0.35%

Steel 454 Tonnes - 4.55%

Mixed Waste 92 Tonnes - 0.92%

Asphalt 14 Tonne - 0.14%

____________

Total Arisings 9.962 Tonnes

Concrete: 93.35% (9,300 Tonnes)

Other: 6.63% (662 Tonnes)

Waste Recycling