The appearance of urban bridges should be beautiful, both inside and outside, and the surface should be flawless, honeycomb-free and pockmarked, so special attention should be paid to the selection of formwork. For cylindrical piers, the formwork is usually assembled in place by assembled steel formwork, and the square symmetry is fixed by stay wires; When the column is too high, add a set of inclined cables in the middle to ensure the sag of the column. After formwork erection, concrete can be poured after inspectors check the verticality and diameter of pier. For square piers, if wooden formwork is used, the inner formwork is usually covered with iron sheet. For beams, the internal formwork generally adopts general-purpose board, but the external formwork is strictly required, and generally adopts 2 cm phenolic resin plywood. If there are obvious requirements for appearance, you should buy imported plates.
For the erection of cast-in-place beam support, foundation treatment should be carried out first. Urban bridges can generally use the existing pavement as the supporting foundation, but attention should be paid to tamping the surrounding backfill parts to prevent uneven settlement. Secondly, the turnover of scaffolding and formwork cannot be repeated too many times. The more times the bridge waits for the turnover of formwork and scaffolding, the longer the construction period. According to the calculated density size of the portal frame, wooden Fang is laid, so that the portal frame support is laid on the wooden Fang, the portal frame is erected to the transverse position of the beam bottom, the portal frame is fixed with steel pipes and fasteners, and the scissors are erected as designed. According to the design elevation and reserved settlement, the bottom formwork is provided with longitudinal and transverse wooden beams, the reserved traffic passage is made of I-beams, and then the phenolic resin plywood is laid.
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