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2015WinterShotcreteEMag

Fig. 8 (left and above): Construction sequence Step 3—lattice girder and extrados reinforcement sidewall sections vertical wall sections. The center arch section is open to allow shotcreting of the vertical walls. In the back, the suspended section of the arch wall, three-piece arch plus one piece each for each acting as a ventilation nozzle, which was not vertical ventilation wall on either side. discussed in detail in this paper, can be seen. Step 3: A light plywood formwork was set up Step 4: Shotcrete was applied at the rounded along with first layer of welded wire reinforce- and vertical wall sections—excluding the center ment at the extrados (exterior curve of the arch) part. Only the vertical wall sections were com- side of the lattice girder. The center part of the pleted to full thickness and with both layers of arch was left open to provide access for the con- reinforcement, while the intrados layer of rein- struction of the vertical walls. Figure 8 illustrates forcement at the arch wall sidewall was left out the erected lattice girders of the arch walls and for later completion. As observed in Fig. 9, the Fig. 9: Construction sequence Step 4—curved and vertical sidewall sections are shotcreted Shotcrete • Winter 2015 47


2015WinterShotcreteEMag
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