On July 21, at the construction site of the Laixi River Bridge on the Rongzi Expressway (Rongchang–Zigong), as the rotary drilling rig bits at the two construction sites in Sichuan and Chongqing slowly descended, the first pile foundation at each end of the bridge officially began drilling. This marks that the controlling project spanning both Sichuan and Chongqing has entered the substantive construction stage of erecting piers and building girders.