Research On Highway Bridge Condition State Assessment And Techniques For Reinforcements

The Hekou bridge is urban river bridge within XiaoGan city on the highway across the water 316, built in the 1960s, when the simple structure, convenient installation, traffic construction in our country were widely adopted. This river bridge is one example. But with the continuous development of transportation, in the operation process later simply-supported beam T some defects were found. Due to the high flange plate is far less than that of T beam height, also did not have enough lateral ties, wing coupling place easily damaged. The number of diaphragm is not enough to set the transverse stiffness of the upper structure, longitudinal cracks formation, single beam was under stress.At the same time as the original design standards cannot satisfy the continuous development of traffic, curing not handled in time, in the wheel crushes perennial bridge, and the rain has damaged reinforced concrete carbonation, leakage, corrosion, component and deformation is a serious effect, safe operation of the bridge.The main work of this paper is the research on river bridge reinforcement method and technical assessment, the concrete content as follows:(1)Introduce the related information bridge reinforcement method and technology condition assessment of the situation at home and abroad.(2) Use highway maintenance comprehensive evaluation standard assessment, the theory, the fuzzy comprehensive evaluation method to evaluate the technique state river bridge, the evaluation of bridge four levels, different methods in 60 points scored results, illustrates the estuary in serious condition, the bridge maintenance and reinforcement to timely.(3) To analyze the reasons why river bridge, which focuses on the beam of T every beam diseases, the influence of the transverse stiffness of the beam bridge is found between the main reasons generating longitudinal cracks, is to improve the overall bridge the transverse stiffness of the key.(4) Introduce several common reinforcement method, puts forward the horizontal clapboard reinforcement method and surfacing consolidation method (composite beams reinforced) two reinforcing scheme, two solutions to improve the principle of the transverse stiffness T beam, and prove the feasibility of the two schemes, according to the actual simulated river bridge girder, through the comparison of the deflection and stress value, strengthening law surfacing elected.(5) Study on bridge deck pavement design and stress, put forward "effect of planting-bar" strengthening surfacing. By considering surface effect and without considering surface effect two cases of load transverse distribution coefficient and the stiffness of the girder is calculated, and the whole section further proved to improve T beam's reinforcement is the ideal effect of the transverse stiffness.(6) Put forward all the disposal scheme of the disease of the Hekou bridge, improve the overall bridge reinforcement effect.