Search Results: 'CIFA'

Largest segments
06 March, 2013
The largest operational EP BM in the world is currently excavating the south bore of the Sparvo highway tunnel project in Italy. The outstanding size of the 15.615m Herrenknecht machine and complex geology has required 700mm thick segments with a high level of steel bar reinforcement. This paper is written by Maurizio Pepino, Gianluca Comin and Alfonso Di Cara of main contractor Toto Costruzioni Generali

Finishing India’s longest
18 June, 2012
Following tunnel excavation breakthrough last September, and the final blast in April this year, work is continuing on the long and notoriously difficult Panjal railway tunnel in India to complete support lining including some necessary ground reinforcement work. Maurice Jones reports on the latest progress

Prepared for the long haul
18 October, 2011
Since precast concrete segmental tunnel lining was invented, there has never been so much development of the ‘product’ as in recent years, even though, superficially, it may look the same. Maurice Jones looks at some of these developments aimed at increasing tunnelling progress whilst avoiding mishaps

Lining with security and efficiency
14 February, 2011
Second only to the ‘excitement’ of watching paint dry in frustration stakes, at least in tunnelling, is waiting for concrete to cure. Maurice Jones examines how formwork and concrete mixtures are increasing the efficiency of cast in situ concrete tunnel lining

Portal to point of use
11 February, 2011
There is no operation in tunnelling where timing is as important as it is in concrete delivery, whether the material is for permanent cast in situ lining, sprayed concrete lining or grouting. Thus the means of delivery must be reliable and available, compact enough to work within tunnel section availability (including mucking out operations), and convenient to use at the point of delivery where space is also likely to be at a premium. Maurice Jones examines the various means of tunnel concrete transport

In the mix on site
11 February, 2011
There are many considerations when deciding how to supply the concrete necessary for lining and support in most tunnelling projects. Not least of these are how to source large volumes of material on site, and to deliver it to the location of use. With usually restricted surface space, and often long transport distances, this is no easy task. Maurice Jones checks on some developments to make it easier

The Italian jobs
11 February, 2011
Tunnelling is booming in Italy, with four major projects under construction and a further eight at the tender, design or financing stage. John McKenna reports

Concrete casting
23 April, 2009
In the field of cast in-situ lining, recent trends in customer requirements in addition to cost efficiency include better fuel economy, work-ability over longer periods, greater pumping parameters, faster erection and removal of formwork. Maurice Jones reports

Segmental success in detailed control
30 January, 2009
Technical journalist Maurice Jones examines some recent developments in improving both efficiency and quality of segmental linings

Collaborations for complex casting
13 August, 2008
The equipment adopted for the in-situ casting of tunnel linings can have a major impact on overall project cost and time schedules. Amanda Foley, deputy editor, looks at three recent case histories

Sprayed concrete success
29 April, 2008
Tunnel support and lining methods involving sprayed concrete have had more than their share of controversy. Technical journalist, Maurice Jones, looks at this maturing technology with practitioners and suppliers

Cast in-situ Tunnel Linings
22 October, 2007
Despite advances in sprayed concrete, segmental lining and some other support technologies, many tunnel designers still prefer a cast concrete lining. Technical journalist Maurice Jones checks on advances in this field

Bespoke handling
01 October, 2004
Specialist Plant Associates produce a wide variety of bespoke segment handling equipment to suit customer requirements. Recent contracts in this field include provision of surface segment handling equipment to CTRL's C220, consisting of hydraulic tippers, feeder systems and lifting frames to suit its 7.15m internal diameter fibre-reinforced precast concrete lining.

Tunnel Support Products
20 August, 2001

Shotcrete suppliers
02 May, 2001
Some leading suppliers of shotcreting equipment and materials, and their recent product introductions, are reviewed here by the staff of 'T&T International'

Ancient route to the East revived
02 May, 2001
The Egnatia highway in Greece is the country's biggest ever construction project and one of Europe's most important. Adrian Greeman visited the project headquarters and several key sites.

Supporting Imigrantes
07 April, 2001
The Imigrantes road project in Brazil connects São Paulo, the country's largest city, to Santos, the country's biggest port, so the route improvements, which includes substantial tunnelling, are vital to the economy.

Solution to Guayaquil traffic congestion
07 April, 2001

World's set fair
01 March, 2001
Tunnelling machinery and major symposiums on tunnelling and microtunnelling will be prime features of Bauma 2001 to be held in Munich from 2-8 April. Mike Winney and T&TI report on major points of interest for tunnel engineers

High speed segments for Yellow River diversion
01 July, 2000
The Wanjiazhai Yellow River diversion project will provide the Province's main cities of Taiyuan, Datong and Pingshuo with water through free flowing tunnels to specially constructed reservoirs. Italian contractor Impregilo sends this report.