General

OVERVIEW OF THE DOLOMITIC GEOLOGY UNDERLYING CENTURION

OVERVIEW OF THE DOLOMITIC GEOLOGY UNDERLYING CENTURION

Background Between Centurion and Pretoria, in the northern section of the Gautrain route, the rail alignment traverses about 16km of dolomitic ground, of which 5.8km will be on viaducts (elevated structures) with the remaining portion constructed at ground level. This band of dolomites is part of a broad swathe of dolomite bedrock which surrounds the Johannesburg Granite Dome. The dolomites are...

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TRACK LAYING COMMENCING IN GAUTRAIN TUNNELS

TRACK LAYING COMMENCING IN GAUTRAIN TUNNELS

The first tracks are currently being installed in the tunnel section of Gautrain between Marlboro and Sandton. The track construction within the tunnels utilises a ‘state of the art’ trackform system, consisting of pre-cast concrete blocks, surrounded with a rubber boot cast into concrete.  This is different to the non tunnel sections which uses a conventional ballasted track...

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RAISE BORING TECHNOLOGY USED ON GAUTRAIN

RAISE BORING TECHNOLOGY USED ON GAUTRAIN

Traditional top-down (blind sink) shaft sinking methods involve making a hole in the ground which is progressively deepened and lined until the required shaft depth is reached. This technique has been employed on six of the seven Emergency Access Shafts in the underground section of the Gautrain Project. It requires quite a large working area on surface to establish the required equipment and...

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BALANCED CANTILEVER VIADUCTS

BALANCED CANTILEVER VIADUCTS

An innovative construction technique is being used for the construction of the Gautrain viaducts crossing over the busy N1 and N14 freeways on either side of Centurion. The so-called Balanced Cantilever construction method is used for building long-span bridges over areas where construction from the ground upwards is not possible. The method is therefore ideal for the viaducts being constructed...

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VIADUCT ERECTION THROUGH CENTURION

VIADUCT ERECTION THROUGH CENTURION

To date Gautrain viaduct construction has primarily focused on the Johannesburg, Midrand and Ekurhuleni areas, whilst construction in Centurion has focused mainly on ground improvement and foundation installation. Viaduct erection has however recently commenced on the longest Gautrain viaduct (Viaduct 5) which traverses through Centurion and has a total length of over 4km. Figure 1 : Aerial view...

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CONSTRUCTION OF SEGMENTAL VIADUCTS

CONSTRUCTION OF SEGMENTAL VIADUCTS

Most of Gautrain’s sixteen viaduct structures are being constructed using pre-cast segments installed using the underslung girder technique. The advantage of this technique is that it enables the viaduct deck spans to be erected very rapidly on site with minimal disruption to traffic below. Viaducts are essentially multi-spanned bridges crossing over roads or rivers or valleys. On the Gautrain...

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