Case Study Airforge Building, Pamiers, France

Case study: Airforge building, Pamiers, France SP034a-EN-EU

Case study: Airforge building, Pamiers, France

A typical heavy industrial building, with a height of 22 m and spans of up to 23 m. The steel superstructure supports gantry girders for an overhead crane with capacity of 140 tonnes.

View of the main portal frame during erection

Contents

1. The achievement 2

2. Description 2

3. Project team 4

Case study: Airforge building, Pamiers, FranceC

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1. The achievement 10 500 m2 of industrial building carrying cranes with a capacity up to 140 t

5 halls of various spans: 16 m, 23 m, 22 m and 2 × 23 m

The total length of the building is 98 m and the main hall is 22 m high

1365 tons of structural steelwork completed in 8 months

2. Description The project is a new plant to accommodate a big press with a capacity of 40 000 tons and associated furnaces. 1365 tons of steel were used:

Plate girders: 410 t,

Rolled sections: 673 t,

Gantry girders: 282 t.

Column design is governed by the need to ensure overall stability and satisfy tight horizontal deflection limits for the overhead cranes. For transverse stability, column bases were fixed, with 8 holding down bolts per column, of 52 mm diameter.

Longitudinal stability is ensured by wind-bracing on each column line. Cross bracing is used for the tallest hall. For the other four halls, longitudinal portal frames are adopted. These provide the greatest freedom of passage, without significant increase in steel weight.

Figure 2.1 Vertical bracing

The roof, of 3,1 % slope, consists of steel sheeting externally insulated by rigid rockwool panels (thickness 60 mm) and a waterproof outer layer of weldable elastomer. The roof is supported on rolled or welded plate purlins, generally 6 to 12 m long. For the two bays of 24 m, this distance is halved and the purlins are supported on jack rafters that rest on the ridge beams and eaves beams. One of the characteristics of the roof is that it is partially de-mountable in order to allow the future replacement of the jacks of the press.


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Figure 2.2 Roof structure pre-assembled at ground level to speed erection

The building envelope consists of double-skin insulated panels spanning 6 m horizontally between posts. These posts are generally supported from the ground with simple bases. Near the principal hall the posts have to be suspended from the eaves girders. They are stabilised transversely by the wind girders in the lower halls.

The gantry girders for the 140 t cranes are mono-symmetric welded plate girders; their top flanges are restrained laterally by horizontal lattice beams that resist both wind loads and horizontal crane forces.

Figure 2.3 Crane ways and roof of the main hall


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To ensure an efficient installation of the industrial plant in this factory, the supply of necessary equipment was entrusted to the steelwork erector: platforms, footbridges, staircases, scales, pylons, and pit covers. The assembly of the principal elements of the furnaces was also entrusted to the steelwork erector to make the best use of the specialist erection equipment. Notable features were the 8 chimneys of 18,50 m length and the stainless steel furnace with a total weight of 27t.

3. Project team Project Team

Architect: AGECA

Structural Engineer: TECHNIP

Client: AIRFORGES

Steelwork: GAGNE

Photos: GAGNE


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Quality Record RESOURCE TITLE Case study: Airforge building, Pamiers, France

Reference(s)

ORIGINAL DOCUMENT

Name Company Date

Created by Christophe Antoine CTICM 14/11/2005

Technical content checked by Alain Bureau CTICM 14/11/2005

Editorial content checked by

Technical content endorsed by the following STEEL Partners:

1. UK G W Owens SCI 12/7/06

2. France A Bureau CTICM 12/7/06

3. Sweden B Uppfeldt SBI 21/7/06

4. Germany C Muller RWTH 13/7/06

5. Spain J Chica Labein 21/7/06

Resource approved by Technical Coordinator

TRANSLATED DOCUMENT

This Translation made and checked by:

Translated resource approved by:


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Wrapper Information Title* Case study: Airforge building, Pamiers, France

Series

Description* A typical heavy industrial building, with a height of 22m and spans of up to 23m. The steel superstructure supports gantry girders for an overhead crane with capacity of 140 tonnes.

Access Level* Expertise Public

Identifiers* C:\Documents and Settings\dci\Local Settings\Temporary Internet Filename Files\OLK159\T2104-DFE cxw 3 Jul 06.doc

Format Microsoft Office Word; 6 Pages; 670kb;

Resource Type Client guide Category*

Viewpoint Client, Architect, Engineer

Subject* Single storey building Application Area(s)

Created Date 03/07/2006 Dates

Last Modified Date 23/06/2006

Checked Date 23/06/2006

Valid From

Valid To

Language(s)* English

Author Christophe Antoine, CTICM Contacts

Checked By Alain Bureau, CTICM

Approved by

Editor

Last Modified By

Keywords* Portal frames, Industrial buildings, Single-storey buildings

See Also Eurocode Reference

Worked Example(s)

Commentary

Discussion

Other

Coverage National Applicability EU

Special Instructions


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Case Study Airforge Building, Pamiers, France

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