Shandong high speed bridge engineering

Project name: high-speed bridge in Ji'nan, Shandong

Strengthening materials: Prestress CFRP plate 3mm thick 50mm width

Construction difficulties: T beam 30m span, large span, reinforced concrete protective layer is more, drilling is not smooth

Project overview

The bridge was opened to traffic in June 5, 1999. The bridge has a full length of 1158.06m, the full width of the bridge is 17.25m, and the width of the bridge is 0.5+15.75+1.0m. The upper structure type (17*30+1*40+20*30) T prestressed concrete m beam, transverse layout of 7 beams, the laminated rubber bearing; substructure for reinforced concrete multi frame abutment, reinforced concrete double column pier, reinforced concrete bored pile foundation; bridge deck pavement for asphalt concrete structure, expansion joints for expansion joint.

Major diseases

At 19 o'clock in the evening of October 1, 2015, a truck carrying 37 tons of resin curing agent moved from south to north to the second span of the bridge's left position. The tire caught fire and ignited the cargo, and the burning cargo leaked down the bridge outlet hole to the bridge. The burning time lasted from 19 to 21, the whole process lasted about 2 hours, and the fire engine was finally extinguished by the fire engine.

The fire caused stress occurs serious burns the main bridge left second hole bridge span T beam, diaphragm, beam and pier column, concrete spalling, exposed rebar.

After testing and evaluation, the strengthening scheme is determined as follows:

1 the carbon fiber grid reinforcement system is used to consolidate the damaged area.

2 by the steel hoop set with inorganic grouting material on the most serious damage to the pier was increasing section reinforcement;

3 the 3 CFPP prestressed plates were arranged at the bottom of each beam, and three T beams were flexural.

4 the bonded steel plate method is used to reinforce and reinforce partially damaged diaphragms.