Steel plate caisson construction of bridge expansion foundation
Content introduction 1 Overview The total length of a bridge is 31 54 m, intersection angle 90 °, the superstructure is 3-8m prefabricated reinforced concrete hollow slab, the bridge deck is continuous structure, expansion joints are set at the two abutments, the substructure is reinforced concrete light pier, and the abutment expansion foundation. The design standard is over - 20, hanging - 120, and the clear width of the bridge deck is 11 m+2 × 0.5 m crash barrier. The bridge is located on horizontal curve and concave curve, with horizontal curve radius R=2000m and concave curve radius R=6000 m. The one-way cross slope of the bridge deck is 2%. 2. The terrain, landform and geological conditions reconstruction project is located in the low hills and piedmont plains in the southwest of the Lesser Khingan Mountains. It belongs to the plain hilly terrain, and is dominated by denudation and accumulation terrain - hillock plain. Most of the land along the line is cultivated land. The bridge site of this bridge is located in the low-lying wet Caodianzi section, with muddy loam up to 3m thick. 3 Construction introduction According to the construction organization design, the foundation of the north abutment was first excavated on May 1. When the excavation reached about 3m, a large area of collapse occurred around the foundation. The original plan was unable to continue the construction, and then the wooden pile was used for construction. However, due to the large water content of the silt loam around, the wooden pile was saturated. The strong lateral soil pressure pushed the wooden pile, deformed and damaged, and buried it in the silt. In view of this situation, under the auspices of the competent department, a site meeting was held with the participation of engineering technicians from the design, construction, supervision and other units to discuss the construction scheme, and finally decided to adopt the construction method of steel plate caisson.
