CN217556726U

CN217556726U - Concrete box girder bridge reinforced structure based on FRP section bar

Info

Publication number: CN217556726U
Application number: CN202221066206.0U
Authority: CN
Inventors: 辛灏辉; 高卿林; 刘杰林
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-10-11
Anticipated expiration: 2032-05-06

Abstract

A reinforced structure of a concrete box girder bridge based on FRP (fiber reinforced plastic) sections comprises a concrete box girder, a bridge deck pavement layer, FRP sections at the bottom of the concrete box girder and a concrete box Liang Cebu FRP sections. The concrete box girder is a prefabricated or cast-in-place concrete hollow girder. The bridge deck pavement layer is positioned on the upper part of the concrete box girder; the FRP profiles are spliced at the bottom and the side parts of the box girder, fixed with the box girder by expansion bolts, arranged in the span at the bottom of the box girder along the bridge direction and arranged in the span at the Liang Cebu of the box. The utility model provides a concrete box girder bridge reinforcing scheme based on FRP section bar, make full use of FRP material light, excel in, corrosion-resistant, designability advantage such as good consolidate the concrete box girder effectively, promote the bulk rigidity and the bearing capacity of bridge under the prerequisite that does not increase the bridge dead weight, guarantee the safe and reliable of bridge system.

Description

Concrete box girder bridge reinforced structure based on FRP section bar

Technical Field

The utility model relates to a bridge construction consolidates the field among the civil engineering, in particular to concrete box girder bridge reinforcing scheme based on FRP section bar.

Background

With the acceleration of the urban modernization process, the urban land is tense, the traffic flow is increased rapidly, and the viaducts and the overpasses are constructed in large quantity to improve the vehicle passing efficiency and greatly relieve the traffic jam. The box-shaped section beam has a box chamber, so that the self weight is light, and the box-shaped section beam has good space integral stress performance and excellent section characteristics, so that the box-shaped section beam is widely applied to bridge structures.

In many cases, along with the increase of the service life of the box girder bridge, the structural rigidity of the box girder bridge is reduced, the deflection of the box girder bridge is increased, and the safety service life of the structure is influenced due to various reasons; in addition, due to the reasons of increased allowable load of the structure, service property change, standard updating and the like, the existing structure is difficult to meet new requirements, so the bridge is required to be reformed and reinforced, and the safety and durability level of the highway bridge is improved.

At present, in the reinforcement design of a box girder bridge, in order to improve the local unfavorable stress state of the bridge, reduce the number and the width of cracks of a girder body and realize the prolonging of the service life of a structure, the reinforcement scheme comprises a prestress application technology, a high-strength material added outside and the like. The prestress reinforcing method is characterized in that prestress reinforcing steel bars or composite material reinforcing steel bars are additionally added among beams, and structural reinforcement is realized through the external force action of a tension area of a prestress tensioning release box beam. The FRP bonding reinforcement method is characterized in that high-performance fiber reinforced composite material cloth is selected and bonded on the surface layer of the box girder, so that the box girder and an original member bear force together, wherein carbon fiber reinforced composite materials (CFRP) are mostly used. But the scheme is only suitable for the conditions that the bridge rigidity is enough and the allowable load of the structure is not changed.

When the integral rigidity of the bridge structure is insufficient or the allowable bearing capacity needs to be improved, the prior method is mostly carried out by adopting an external bonded steel reinforcing method or an external concrete reinforcing method. But because steel is easy to corrode in the air, the later-period maintenance cost is high, the self weight of the structure can be greatly improved by wrapping concrete outside, and the requirement on the lower structure of the reinforced bridge is higher. Therefore, an effective reinforcing scheme is not available at present, and the advantages of corrosion resistance, light dead weight and low later maintenance cost can be considered while the rigidity of the bridge is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at prior art not enough, provide a concrete box girder bridge reinforcing scheme based on FRP section bar, utilize advantages such as FRP section bar light, excel in, corrosion-resistant, designability are good, solve current problem.

The technical scheme adopted is as follows:

a concrete box girder bridge reinforcing scheme based on FRP (fiber reinforced plastic) sections structurally comprises a concrete box girder, a bridge deck pavement layer, FRP sections at the bottom of the concrete box girder and a concrete box Liang Cebu FRP sections. The concrete box girder is a prefabricated or cast-in-place concrete hollow girder, and the external section form is one of rectangle, trapezoid and curved edge. The bridge deck pavement layer is positioned on the upper part of the concrete box girder; the FRP profile at the bottom of the concrete box girder is arranged at the midspan position at the bottom of the box girder, the FRP profile at the bottom of the concrete box Liang Cebu is arranged at the side-span position of the box Liang Cebu, the specific arrangement length is calculated according to the actual reinforcement requirement, and the profile and the box girder are fixed by expansion bolts.

The FRP section comprises a C-shaped FRP section, an I-shaped FRP section and an I-shaped FRP section with an inclined web plate, the end part of the flange of the section needs to be prefabricated with an outer tenon and an outer mortise, and the section can be spliced into a continuous FRP hollow panel through an adhesive.

In the embodiment of the reinforcing scheme of the concrete box girder bridge based on the FRP profiles, the C-shaped and I-shaped FRP profiles are selected for the bottom of the box girder and are spliced into a continuous FRP hollow panel with a vertical web plate, and the continuous FRP hollow panel is mainly used for bearing tensile load caused by bending moment; the two sides of the box girder are made of C-shaped and web-inclined I-shaped FRP sectional materials which are spliced into a web-inclined continuous FRP hollow panel which is mainly used for bearing shearing load.

The utility model provides a concrete box girder bridge reinforcing scheme based on FRP section bar through arranging the FRP section bar in case bottom of the roof beam and lateral part, utilizes advantages such as FRP section bar light, excel in, corrosion-resistant, designability are good, consolidates concrete box girder bridge effectively, promotes the bulk rigidity and the bearing capacity of bridge under the prerequisite that does not increase the bridge dead weight, guarantees the safe and reliable of bridge system.

Drawings

Fig. 1 is the utility model discloses an FRP section bar arranges the position sketch along the bridge direction in the embodiment of the utility model.

Fig. 2 is the utility model discloses an FRP section bar reinforced concrete box girder section view.

Fig. 3 is a detailed view of the type and structure of the FRP section in the embodiment of the present invention.

Detailed Description

The embodiment of the utility model discloses a do not limit the utility model discloses a patent range, all utilize the equivalent structure or equivalent flow transform that the specification content was done, or direct or indirect application is in other relevant technical fields, all including on the same reason the utility model discloses within the patent protection scope.

The utility model provides a concrete box girder bridge reinforcement scheme based on FRP section, the structure includes concrete box girder 1, bridge deck pavement layer 2, concrete box girder bottom FRP section 3 and concrete box girder lateral part FRP section 4. The concrete box girder 1 is a prefabricated or cast-in-place concrete hollow girder, and the external section form is one of rectangle, trapezoid and curved edge. The bridge deck pavement layer 2 is positioned on the upper part of the concrete box girder 1; the FRP profile 3 at the bottom of the concrete box girder and the FRP profile 4 at the side of the concrete box girder are spliced and respectively arranged at the bottom of the box girder 1 and the side of the box girder 1 and are fixed with the box girder 1 by expansion bolts 5.

In the embodiment of the reinforcing scheme of the concrete box girder bridge based on the FRP profiles provided by the utility model, the FRP profiles 3 at the bottom of the concrete box girder comprise C-shaped FRP profiles 6 and I-shaped FRP profiles 7, and are mainly used for bearing the tensile load caused by bending moment; the FRP profiles 4 at the side parts of the concrete box girder comprise C-shaped FRP profiles 6 and I-shaped FRP profiles 8, and are mainly used for bearing shearing load. The outer tenons 9 and the outer mortises 10 are prefabricated at the flange end parts of the FRP profiles 3 at the bottom of the concrete box girder and the FRP profiles 4 at the side parts of the concrete box girder, so that the continuous FRP hollow panel can be spliced by adhesives.

The utility model discloses during the use, after the quantity of selecting concrete box girder bottom FRP section 3 and concrete box girder lateral part FRP section 4 according to 1 cross sectional dimension of concrete box girder, at first the C shape FRP section 6 that will have outer tenon 9 is fixed in box girder one side through expansion bolts 5. And then, an I-shaped FRP section 7 or an I-shaped FRP section 8 with an inclined web plate is selected, the outer mortise 10 of the section is spliced with the outer tenon 9 of the fixed section through an adhesive, and the flange on the other side of the section and the box girder 1 are reinforced by adopting an expansion bolt 5. Repeating the work, and finally selecting the C-shaped FRP section with the outer mortise 10 to be bonded with the fixed section through the adhesive to form the closed continuous FRP hollow panel.

Considering that the bending moment of the concrete box girder bridge is larger at the midspan position and the shearing force is larger at the edge-crossing position, the FRP profile 3 at the bottom of the concrete box girder is arranged at the midspan position of the concrete box girder 1 when the bridge is reinforced, the FRP profile 4 at the side of the concrete box girder is arranged at the edge-crossing position of the concrete box girder 1, and the concrete arrangement length is calculated according to the actual reinforcement requirement.

Compare in current reinforced structure, concrete box girder bridge reinforcing scheme based on FRP section bar, make full use of FRP material light, excel in, corrosion-resistant, designability advantage such as good, through utilizing FRP section bar expansion bolts 5 to be fixed in concrete box girder 1's bottom and lateral part, consolidate concrete box girder 1 effectively, promote the bulk rigidity and the bearing capacity of bridge under the prerequisite that does not increase the bridge dead weight.

Claims

1. The utility model provides a concrete box girder bridge reinforced structure based on FRP section bar, includes concrete box girder (1), bridge deck pavement layer (2) are located concrete box girder (1) upper portion, its characterized in that: the box beam bottom FRP profile (3) is rigidly connected to the bottom of the box beam (1), the box Liang Cebu FRP profile (4) is rigidly connected to the side of the box beam (1), the box bottom FRP profile (3) comprises a C-shaped FRP profile (6) and an I-shaped FRP profile (7) and is spliced through an adhesive, and the box Liang Cebu FRP profile (4) comprises a C-shaped FRP profile (6) and an I-shaped FRP profile (8) with an inclined web and is spliced through an adhesive.

2. The FRP profile-based concrete box girder bridge reinforcing structure as claimed in claim 1, wherein: the FRP profile (3) at the bottom of the concrete box girder is arranged in a region with large bending moment in the span of the concrete box girder (1), and the FRP profile (4) of the concrete box Liang Cebu is arranged in a region with large shearing force in the span of the concrete box girder (1).