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Title:

HUGUENOT TUNNEL VENTILATION CONTROL

Accession Number:

00788439

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/0041414X

Abstract:

The ten year old Huguenot Toll Tunnel is in the Western Cape area of South Africa, on the N1 main road between Cape Town and Johannesburg. It was excavated as an inverted horseshoe. At present, only its south tube is operational, and has bi-directional traffic flow. Its north bore was excavated but not lined or equipped. Each portal has two 3.2m diameter fans, which serve half the tunnel. Although the fire detection and exhaust system has always functioned well, the first complaints of bad air were received soon after the tunnel opened. This article describes the research which began when it was confirmed that the tunnel's natural airflow, combined with the increase in pollutants from vehicles, adversely affected the ventilation system's performance. Extensive weather data began to be acquired in November 1996, and data analyses were performed in May 1997 and June 1998. It was found that airflows induced in the tunnel by weather often adversely affect the ventilation flows in the south tube, and that part or all of the ventilation system should be switched off in strong weather conditions. The primary objective of the new control system, which uses an expert system and is now being installed, will be to control the ventilation fans more effectively, allowing for airflows induced by the weather.

Language:

English

Corporate Authors:

Miller Freeman

Calderwood Street
London SE18 6QH United Kingdom

Authors:

Bullock, P J

Pagination:

p. 21-4

Publication Date:

1999-12

Serial:

Tunnels & Tunnelling International

Volume: 31
Issue Number: 12
Publisher: Progressive Media Markets, Ltd
ISSN: 0041-414X

Geographic Terms:

Subject Areas:

Bridges and other structures; Highways; Vehicles and Equipment

Source Agency:

Transport Research Laboratory

Crowthorne House, Nine Mile Ride
Wokingham, Berkshire RG40 3GA United Kingdom

Source Data:

IRRD E104246

Files:

ITRD

Created Date:

Mar 3 2000 12:00AM

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