Unbonded prestress of box girder or T-shaped girder, and steel-concrete combined reinforcement structure and construction method

The present invention discloses a box girder or beams T and unbonded prestressed steel - reinforced concrete composite structure. The reinforcing structure disclosed comprises a bottom plate, along the bridge plug to the steel plate, Transverse; wherein the bottom plate, along the bridge plug steel plate transverse direction and the reinforcing bridge portion to be disposed around a cavity is formed, the the cavity is provided through a plurality of tendons and the concrete is poured, concrete thickness and 10 ~ 15cm; tendons of the tension side is fixed to the transverse bridge plug plate. First, construction of the reinforcing structure determines the portion to be reinforced; cleaning parts of the surface to be reinforced, the bolt; and then mounting portion to be reinforced and the reinforcing member is provided to enclose the cavity; pouring the concrete in the cavity; final design strength of the concrete to after prestressed and fixed. Reinforcing structure of the present invention have a neat appearance, high stability, and easy construction characteristics.