Hollow slab beam reinforcing method and hollow slab beam

Abstract

The invention relates to the technical field of bridge reinforcement, in particular to a hollow slab beam reinforcement method. The method comprises the following steps of S1, determining a shear bearing capacity insufficient area and a shear bearing capacity satisfaction area of the hollow slab beam; S2, drilling at least one construction hole in the shear bearing capacity insufficient area so that the cavity of the hollow slab girder is communicated with the construction holes; S3, pouring lateral framework materials into the cavity of the hollow slab beam through the construction holes to form a lateral formwork, wherein the lateral formwork separates the shear bearing capacity insufficient region from the shear bearing capacity satisfaction region; and S4, filling the cavity of the shear bearing capacity insufficient region with reinforcing materials to form a solid reinforcing body. Through the construction holes, it can be ensured that reinforcing materials enter the cavity, andthe lateral formworks can prevent the reinforcing materials from flowing from the shear bearing capacity insufficient area to the shear bearing capacity satisfaction area, so the using amount of the reinforcing materials is reduced, the maintenance and reinforcement cost is reduced, and the situation that the bearing capacity of the lower structure of the bridge is affected due to excessive increase of the dead weight of the hollow slab beam is avoided.

Description

technical field [0001] The invention relates to the technical field of bridge reinforcement, in particular to a method for reinforcing a hollow slab girder and a hollow slab girder. Background technique [0002] Prefabricated ordinary (or prestressed) concrete hollow slab girders are widely used in small and medium-span bridges due to the advantages of rapid factory manufacturing and simple process. Due to technical defects in materials, design, construction technology, etc., and the influence of factors such as overloaded vehicles during the operation period, some ordinary (or prestressed) concrete hollow slab beams in service in my country's early construction have oblique cracks and other shear loads at the ends. The problem of insufficient capacity. For such ordinary (or prestressed) concrete hollow slab girders, it is not only a waste of resources to directly dismantle and rebuild, but also requires interruption of traffic, high cost and long construction period. Espec...

AI Technical Summary

Problems solved by technology

Due to technical defects in materials, design, construction technology, etc., and the influence of factors such as overloaded vehicles during the operation period, some ordinary (or prestressed) concrete hollow slab beams in service in my country's early construction have oblique cracks and other shear loads at the ends. The problem of insufficient ability

For such ordinary (or prestressed) concrete hollow slab beams, if it is directly demolished and rebuilt, it is not only a waste of resources, but also requires interruption of traffic, high cost and long construction period

Especially if this type of bridge crosses special structures, such as railways, military facilities, etc., it will be more difficult to dismantle and rebuild, with higher cost and longer construction period

There are also methods to avoid demolition and reconstruction of the old hollow slab bridge reinforcement methods commonly used at present, such as bridge deck thickening reinforcement method, pasting reinforcement method, external prestressing reinforcement method, structural system modification method, etc., but all have limitations, such as Pasting steel plates and fiber composite materials have problems of bonding effect and durability between reinforcement materials and substrates; external prestressing and changing system reinforcement methods have many problems such as complicated reinforcement process

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