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Bridge repair

The characteristics of bridge repair and reinforce project.

A.)The bridge repair and reinforce project is often restricted by the space of the existing structures and components. The space of the construction site is small, and the large prefabricated component is hard to enter the site, therefore cannot play its role.

B.) In order to work without interrupting the traffic or with minimum interruption, the bridge repair and reinforce project requires an easy and rapid construction technique, and a short working period, and is usually conducted by stages.

C.) There is a large amount of work during the process of bridge repair and reinforcement. It is a complex process and there exists many unsafe factors.

D.) The bridge repair and reinforcement work will be disadvantageous to the existing and adjacent structures and components. Therefore, try not to damage the existing structures during the construction process.

E.) Regarding the bridge reinforcement and strengthening, there are many factors should be adequately considered - the strength of new and old structures, the balance between the hardness and service time, and the coordination between the new and old structures.

F.) When structure damage is caused by freeze-saw, corrosion, the uneven settlement of the foundation, etc, effective measures should be taken into consideration to reduce, offset or eliminate all disadvantageous factors to avoid the reinforced structure suffering from further damage. When under the condition that there are damages in both top and bottom structures of the bridge, the top structure can only be reinforced after the bottom structure damage is repaired.

G.) For structures with potential cracking, tilting or collapsing risk, temporary safety precautions should be taken before construction in case of accident.

H.) Bridge reinforcement project has higher economic efficiency comparing with building a new bridge, which costs only 20-30% of new bridge construction.

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