CN204174544U - A kind of bridge strengthening structure based on FRP material - Google Patents

Abstract

The utility model provides a kind of bridge strengthening structure, its offering groove across set direction and being embedded with FRP muscle at bridge panel, the FRP sheet of strip is adhesive with in the longitudinal direction (with across the crossing direction of set direction) of bridge panel, ruggedized construction of the present utility model adopts twocouese reinforcing mode, matching panel structure is two-way by curved or the shear behavior, improves consolidation effect.In addition, adopt FRP muscle as girth member at bridge panel across set direction, FRP muscle can be fixed with adjacent structure (brace summer) easily, be conducive to the stability and the height that improve ruggedized construction, and the FRP sheet of strip is adopted at horizontal direction, then can avoid fluting demand, avoid the problem of transversal slotting.

Description

A bridge reinforcement structure based on FRP material

technical field

The utility model relates to the technical field of bridge reinforcement, in particular to a bridge reinforcement structure based on FRP materials.

Background technique

In bridge engineering construction, whether it is concrete structure, steel structure or steel-concrete composite structure, the bridge deck is usually a reinforced concrete slab structure. Over the past 20 years, the structural systems of these bridges have been exposed to a number of problems, the most serious being corrosion of reinforcement or steel, resulting in premature structural degradation or inadequate function. Due to the small thickness of the protective layer, the direct action of deicing salt on the surface of the bridge deck, and the fact that it is prone to cracking due to long-term traffic loads, the corrosion of steel bars is particularly serious. Therefore, structural reinforcement is required for bridge panels with insufficient structural functions.

In recent years, FRP (Fiber Reinforced Plastics, fiber reinforced composite plastics) materials have been widely used in concrete structures and other structural reinforcement fields due to their characteristics of corrosion resistance, light weight, high strength, and convenient construction. At present, the research on FRP-strengthened reinforced concrete structures mainly focuses on the reinforcement technology of FRP sheets, and various countries have also introduced corresponding specifications one after another. In the FRP reinforced concrete structure, the FRP-concrete bond interface is a weak link, and the interface bond strength often determines the effective stress of FRP (the stress achieved by FRP when the structure reaches the ultimate bearing capacity), thus determining the efficiency and effectiveness of FRP reinforcement. economy. Through the analysis of the previous FRP externally reinforced concrete bridge deck engineering, the reinforcement technology has the following problems in reinforcing the damaged bridge deck structure:

(1) With the increasingly heavy traffic load, the damage area of the reinforced concrete bridge deck is larger, and the traditional FRP external reinforcement method leads to higher construction and material costs, which restricts the promotion of this material with higher durability application;

(2) When the external FRP sheet reinforcement technology is applied to the bridge deck, it is vulnerable to accidental loads such as abrasion and impact, resulting in secondary damage to the reinforcement part, so secondary reinforcement occurs frequently;

(3) The external FRP sheet is not easy to anchor with adjacent components, and it is difficult to improve the stability and rigidity of reinforcement.

(4) If embedded reinforcement is used to reinforce the damaged panel, it is not suitable for longitudinal (perpendicular to the span direction) reinforcement of the panel structure due to the need for slotting;

(5) When the panel structure is subjected to local loads (such as tire loads), the panel structure is usually subjected to bidirectional bending or shearing. The current reinforcement methods are all unidirectional reinforcement, which is difficult to meet the demand.

Contents of the invention

The purpose of the utility model is to avoid the disadvantages of the above-mentioned prior art and provide a bridge reinforcement structure that can match the bidirectional bending or shearing characteristics of the bridge, thereby improving the reinforcement effect.

The purpose of this utility model is achieved through the following technical solutions:

Provided is a bridge reinforcement structure based on FRP materials, including support beams and bridge panels to be reinforced spanning between the support beams, the bottom surface of the bridge panels is provided with grooves along the spanning direction of the bridge panels, the FRP tendons are embedded in the groove, and a strip-shaped FRP sheet is pasted on the bottom surface of the bridge panel along the direction intersecting with the groove.

Preferably, the FRP sheet is arranged vertically to the groove.

Preferably, the ends of the FRP tendons are anchored to the support beams.

Preferably, the groove is also filled with fixing glue to fix the FRP bars in the groove.

Preferably, the depth and width of the groove are both 1.5 times the diameter of the FRP rib.

Beneficial effects of the utility model: the utility model provides a bridge reinforcement structure, which is provided with grooves in the spanning direction of the bridge panel and embedded with FRP ribs, and in the longitudinal direction of the bridge panel (the direction intersecting with the spanning direction) The strip-shaped FRP sheet is pasted, and the reinforcement structure of the utility model adopts a bidirectional reinforcement method, which matches the bidirectional bending or shearing characteristics of the panel structure, and improves the reinforcement effect. In addition, FRP bars are used as reinforcements in the spanning direction of the bridge deck. FRP bars can be easily fixed with adjacent structures (support beams), which is beneficial to improve the stability and height of the reinforced structure. Shaped FRP sheets can avoid the need for slotting and avoid the problem of horizontal slotting.

Description of drawings

Utilize accompanying drawing to further illustrate the utility model, but the embodiment in the accompanying drawing does not constitute any restriction to the utility model, for those of ordinary skill in the art, under the premise of not paying creative work, also can obtain according to following accompanying drawing Additional drawings.

Fig. 1 is a structural schematic diagram of a bridge reinforcement structure based on FRP materials of the present invention.

Fig. 2 is a schematic diagram of the arrangement of FRP tendons and FRP sheets of the present invention.

In Figure 1 are included:

1——supporting beam, 2——bridge panel, 3——groove, 4——FRP tendon, 5——fixing glue, 6——FRP sheet.

Detailed ways

The utility model is further described in conjunction with the following examples.

A specific embodiment of a bridge reinforcement structure based on FRP materials of the present invention, as shown in Figure 1 and Figure 2, includes a support beam 1 and a bridge panel 2 to be reinforced spanning between the support beams 1, the bridge panel 2 The bottom surface of the bridge panel 2 is provided with a groove 3 along the spanning direction of the bridge panel 2 (in the transverse direction in Fig. 1 and Fig. 2), and FRP ribs 4 are embedded in the groove 3, and the depth and width of the groove 3 are the same as the FRP 1.5 times the diameter of the rib 4, the groove 3 is also filled with fixing glue 5 so that the FRP tendon 4 is fixed in the groove 3, the end of the FRP tendon 4 is anchored to the support beam 1, and the bridge panel 2 The bottom surface is also pasted with a strip-shaped FRP sheet 6 along the longitudinal direction (the direction intersecting the spanning direction, the direction perpendicular to the drawing in FIG. 1 , and the longitudinal direction along the drawing in FIG. 2 ).

The above-mentioned bridge reinforcement structure has grooves 3 in the spanning direction of the bridge panel 2 and embedded with FRP ribs 4, and a strip-shaped FRP sheet 6 is pasted in the longitudinal direction of the bridge panel 2 (the direction intersecting with the spanning direction). The reinforcement structure of the utility model adopts a bidirectional reinforcement method, which matches the bidirectional bending or shear characteristics of the panel structure and improves the reinforcement effect. In addition, FRP tendons 4 are used as reinforcements in the spanning direction of bridge deck 2, and FRP tendons 4 can be easily fixed with adjacent structures (support beams 1), which is conducive to improving the stability and height of the reinforced structure. The use of strip-shaped FRP sheet 6 in the lateral direction can avoid the need for slotting and the problem of lateral slotting.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (5)

1. A bridge reinforcement structure based on FRP materials, comprising support beams and bridge panels to be reinforced between the support beams, characterized in that: the bottom surface of the bridge panels is provided with concave holes along the span direction of the bridge panels The groove is embedded with FRP tendons, and the bottom surface of the bridge panel is pasted with a strip-shaped FRP sheet along the direction intersecting with the groove. 2. A bridge reinforcement structure based on FRP material according to claim 1, characterized in that: the FRP sheet is arranged vertically to the groove. 3. The bridge reinforcement structure based on FRP material according to claim 1, characterized in that: the ends of the FRP tendons are anchored to the support beams. 4. A bridge reinforcement structure based on FRP material according to claim 1, characterized in that: the groove is also filled with fixing glue to fix the FRP bars in the groove. 5. A bridge reinforcement structure based on FRP material as claimed in claim 1, characterized in that: the depth and width of the groove are both 1.5 times the diameter of the FRP tendon.