The stability of such structures depends on the position of the line of pressure in relation to the extrados and intrados of the arch ring. [Please select]
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The concrete was then carried up to the springing lines, the arch centers in two pieces were placed; the arch bar of the reinforcement was placed and the extrados forms erected up to the 45° lines, all as shown by Fig. [Please select]
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The four sides of the mold formed the extrados, the intrados, and the two ends of the block; the other two sides being left open. [Please select]
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