Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress
A concrete and prestressed technology, used in bridge reinforcement, bridges, bridge maintenance, etc., can solve the problem that prestressed tendons cannot bend upwards, enhance bending resistance, and cannot solve main tensile stress and shear strength. Undesirable stress state, reduction of reinforcement cost, effect of solving positive and negative bending moment and shear force deficiency
Inactive Publication Date: 2006-09-27
SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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Problems solved by technology
When the beam body is a cast-in-place overall box-shaped or solid section, due to the barrier of the bottom plate, the prestressed tendons cannot be bent upward, so the problem of main tensile stress and shear strength cannot be solved, and it is limited to the enhancement of bending resistance
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] refer to figure 1 , integral cast-in-situ concrete girder bridge of the present invention, slab bridge prestressed reinforcement method, comprises the steps:
[0018] a. lay out the tunnel group, drill the tunnel group formed by many pairs of tunnels 25, 26 through the top 23 and the bottom 24 of the beam body 20, each pair of tunnels 25, 26 is arranged at intervals along the beam body 20 laterally, in pairs The tunnels 25, 26 are longitudinally spaced apart along the beam body 20;
[0019] b. Lay out the prestressed tendon group 10, each prestressed tendon passes through the corresponding tunnel 25, 26, that is, the bottom 24 passes through the tunnel 25 to the top 23 of the board, and then the top 23 passes through the tunnel 26 to the top of the board. plate bottom 24;
[0020] c. Stretch each prestressed tendon, and anchor each prestressed...
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The invention discloses a integrated irrigated concrete bridge and pre-stress strengthen method, which comprises: a, laying hole channel that drilling couples of hole channels (25, 26) through the plate top (23) and the plate bottom (24) on the beam (20) to be transversely distantly arranged along the beam (20) while the couple one (25, 26) are longitudinally distantly arranged; b, laying pre-stress bar group (1), while each is through relative hole channels (25, 26) as from the bottom (24) via hole channel (25) to the top (23), and from the top (23) via hole channel (26) to the bottom (24); c, drawing each pre-stress bar and anchoring the pre-stress bar with the beam (20) via anchoring elements.
Description
technical field [0001] The invention relates to a prestressed strengthening method, in particular to a method for strengthening integral cast-in-situ concrete beam bridges and slab bridges through prestressing. Background technique [0002] Slab bridge is a common bridge type with large quantity and wide area in highway bridges. It has simple structure and clear stress. It can adopt reinforced concrete and prestressed concrete structures; Therefore, it is widely used in general highways, high-grade highways and urban road bridges. Especially the medium and small-span bridges on highways with restricted building heights and plain areas are especially popular, which can reduce the filling height of embankments, occupy less cultivated land and save earthwork volume. With the passage of time, any highway bridge will become an old bridge, and there will be defects and diseases to varying degrees due to various reasons, which need to be repaired, reinforced and reconstructed. Th...
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Inventor 郑远鹄郑旭峰肖世卫李美军牟廷敏张琪朱学雷
Owner SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST