Reinforcement structure and method for the close-up section of a T-girder bridge.

Abstract

The present invention provides a method and structure for reinforcing the infill section of a T-girder bridge, which reduces the coverage rate of reinforcing materials that are not visible, can be constructed from the underside of the deck slab without obstructing traffic, and reinforces the deck slab and infill section of the T-girder bridge to be reliably integrated. [Solution] In a reinforcement structure 1 for the gap portion of a T-girder bridge B1, which has multiple existing T-girder deck sections 2 and gap portions 3 formed between the deck sections 2, the reinforcement structure 1 for the gap portion of a T-girder bridge is provided to prevent the gap portion 3 from falling out. The structure comprises a groove 4 formed on the lower surface of the deck sections 2 and the gap portion 3 with the vertical direction as the depth direction, a strip-shaped reinforcing material 5 inserted into the groove 4, and a filler material 6 filled into the groove 4 around the reinforcing material 5. The reinforcing material 5 is inserted into the groove 4 with the width direction of the strip-shaped reinforcing material 5 as the vertical direction, and the depth D2 of the groove 4 is made approximately the same as the width T1 of the reinforcing material 5.

Claims

[Claim 1] A reinforcing structure for the gap portion of a T-girder bridge, which includes multiple existing T-girder deck sections and gap portions formed between the deck sections, to prevent the gap portions from falling out. The lower surface of the floor slab and the gap filling portion comprises a groove formed in the vertical direction with depth, a strip-shaped reinforcing material inserted into the groove, and a filling material that fills the groove around the reinforcing material. The reinforcing material is inserted into the groove with the width direction of the strip-shaped reinforcing material as the vertical direction, and the depth of the groove is approximately the same as the width of the reinforcing material. A reinforcing structure for the close-to-bridge section of a T-girder bridge, characterized by the following features. [Claim 2] The reinforcing material is an FRP plate. The reinforcing structure for the gap between T-girders of a bridge according to claim 1, characterized by the above. [Claim 3] The FRP plate is an FRP plate in which unidirectionally arranged reinforcing fibers are impregnated with a thermosetting resin and formed into a strip-shaped plate. The reinforcing structure for the gap between T-girders of a bridge according to claim 2, characterized by the above. [Claim 4] The reinforcing fiber is a carbon fiber, aramid fiber, glass fiber, or basalt fiber. The reinforcing structure for the gap between T-girders of a bridge according to claim 2, characterized by the above. [Claim 5] The FRP plate consists of a central plate positioned below the gap-filling portion and a pair of left and right haunch plates positioned on the haunch portion on the lower surface of the floor slab. The anchoring length at which the central plate and the haunch plate overlap is 2.5 times or more the concrete cover thickness of the floor slab and the infill portion. The reinforcing structure for the gap between T-girders of a bridge according to claim 2, characterized by the above. [Claim 6] The depth of the groove portion shall be less than the minimum cover thickness of 30 mm. The reinforcing structure for the gap between T-girders of a bridge according to claim 1, characterized by the above. [Claim 7] The width of the groove portion shall be between 10 mm and 40 mm. The reinforcing structure for the gap between T-girders of a bridge according to claim 6, characterized by the above. [Claim 8] The ratio of the width of the groove to the width of the reinforcing material is greater than 0.5 and less than or equal to 2.

0. The reinforcing structure for the gap between T-girders of a bridge according to claim 7, characterized by the above. [Claim 9] A method for reinforcing the gaps between T-girders of a T-girder bridge, which comprises existing deck sections of multiple T-girders and gaps formed between the deck sections, by installing a strip-shaped reinforcing material in the gaps between the deck sections. A grooving step is performed to form a groove by cutting grooves in the lower surface of the haunch portion and the lower surface of the gap portion with the vertical direction as the depth direction, A filler material filling step is performed in which a filler material is filled into the grooves cut in the groove cutting step, The system includes a reinforcing material insertion step, in which a strip-shaped reinforcing material is inserted into the groove portion, which has been filled with the filler material in the filler material filling step, with the width direction of the reinforcing material being vertical. A method for reinforcing the gap between T-girders of a bridge, characterized by the following: [Claim 10] In the groove cutting process, the groove is formed to a depth of less than 30 mm, which is the minimum cover thickness. A method for reinforcing the gap between T-girders of a bridge according to claim 9, characterized by the above. [Claim 11] In the groove cutting process, the groove portion is formed to have a width of 10 mm or more and 40 mm or less. A method for reinforcing the gap between T-girders of a bridge according to claim 9, characterized by the above. [Claim 12] In the groove cutting process, the ratio of the width of the groove to the width of the reinforcing material is formed to be greater than 0.5 and less than or equal to 2.

0. A method for reinforcing the gap between T-girders of a bridge according to claim 10 or 11, characterized by the above.

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