CN111663459A - Bridge reinforcing device based on high-molecular metal composite material plate and manufacturing method thereof - Google Patents

Abstract

The invention provides a bridge reinforcing device based on a high-molecular metal composite material plate and a manufacturing method thereof, and the bridge reinforcing device is applied to maintenance and reinforcement of bridges. The device comprises a longitudinal beam and a cross beam connected with the longitudinal beam through a connecting plate, wherein the connecting plate is vertically connected with the cross beam; the upper wing plate and the connecting plate of the cross beam are respectively provided with an L-shaped steel plate fixedly connected with the upper wing plate and the connecting plate, and peripheral steel sheets are arranged between the L-shaped steel plate and the upper wing plate and between the L-shaped steel plate and the connecting plate of the cross beam; the L-shaped steel plate is provided with 3 exhaust holes and 1 pouring hole, and a high polymer material interlayer is poured in the pouring hole. The device is welded on the upper wing plate of the beam and the beam connecting plate to prevent the connecting plate from bending out of the plane to generate fatigue cracks, thereby increasing the local fatigue resistance, preventing the fatigue cracks from expanding and improving the overall strength and rigidity of the beam connecting plate. The method can be applied to the reinforcement and repair of the bearing metal structure in large-scale equipment, and can obviously improve the bearing capacity of the metal structure.

Description

A bridge reinforcement device based on polymer metal composite material plate and its manufacturing method

technical field

The invention relates to the technical field of bridges, in particular, to a bridge reinforcement device based on a polymer metal composite material plate and a manufacturing method thereof.

Background technique

Fatigue of steel bridges can be defined as a progressive failure behavior from the formation and slow propagation of local micro-cracks caused by defects or flaws to the final fracture under the action of repeated cyclic stress. Under the action of cyclic loads, the horizontal and vertical connection structures of steel frame bridges are prone to fatigue cracks. These cracks will cause structural damage to a certain extent and pose a threat to the safety of the bridge.

At present, the common method of bridge reinforcement in China is to use carbon fiber composite sheet to reinforce the bridge, and the carbon fiber reinforced composite sheet is a composite material generated by fine fibers wrapped in a resin matrix. The carbon fiber acts as a stiffener, while the resin acts as a binding fiber, usually an epoxy resin. The shear force between the fiber and the concrete is transmitted through the resin to achieve the effect of reinforcement. The method of pasting the carbon fiber composite sheet is to arrange continuous carbon fibers with high strength or high elastic modulus into bundles in one direction, and impregnate them with epoxy resin to form a carbon fiber reinforced composite sheet. The sheet is pasted on the tensile surface of the bridge structure with specially formulated epoxy resin. After the resin is cured, a new stress complex is formed with the original structure, and the carbon fiber can be stressed together with the steel bar. Since the carbon fiber sheet shares the load, the stress of the steel bar is reduced, and the structure is reinforced.

In summary, carbon fiber reinforced composite materials are gradually being widely used in bridge reinforcement due to their light weight, high strength, corrosion resistance, fatigue resistance and other characteristics, and their shortcomings in bridge reinforcement applications have also emerged. as described below:

(1) Bonding carbon fiber board can improve the bending stiffness of the reinforced beam in the later stage of loading, but the stiffness improvement effect in the elastic stress stage is not obvious;

(2) Sticking carbon fiber board can suppress the cracks in the later stage of loading, but the effect of increasing the cracking moment and improving the early cracking is not significant;

(3) The ductility of carbon fiber reinforced composites is insufficient, and the internal force distribution is uneven. Insufficient ductility of materials will directly lead to insufficient ductility of components, and excessive deformation of components will lead to brittle fracture of fiber composites, resulting in brittle failure of structures;

(4) Although carbon fiber has excellent mechanical properties and physical and chemical properties, due to its high price, it leads to high production costs and lacks competitiveness.

SUMMARY OF THE INVENTION

According to the technical problems raised above, a bridge reinforcement device based on a polymer metal composite material plate and a manufacturing method thereof are provided. The invention is applied to the maintenance and reinforcement of bridges. Fatigue cracks are prone to occur at the horizontal and vertical joints of bridges. The device of the invention is welded to the dangerous points of the joints to prevent out-of-plane bending at the joints, thereby increasing the local fatigue resistance, preventing the expansion of fatigue cracks, and improving the beam. The overall strength and stiffness of the connecting plate. The reinforcement device can obviously improve the bearing capacity of the metal structure, so it is very suitable for the reinforcement and repair of the steel bridge structure.

The technical means adopted in the present invention are as follows:

A bridge reinforcement device based on a polymer metal composite material plate, comprising a longitudinal beam and a transverse beam connected with the longitudinal beam through a connecting plate, the connecting plate and the transverse beam are vertically connected; the upper wing plate and the connecting plate of the transverse beam are respectively provided with There is an L-shaped steel plate fixedly connected with it, and a peripheral steel sheet is arranged between the L-shaped steel plate and the upper wing plate and the connecting plate of the beam; 3 exhaust holes and 1 pouring hole are opened on the L-shaped steel plate , a polymer material interlayer is poured in the pouring hole.

Further, the exhaust hole and the pouring hole are respectively engraved with threads, which are respectively used to connect the polymer material pouring valve and the exhaust valve.

Further, when the polymer material interlayer is poured in the pouring hole, a guard beam is provided on the outer surface of the L-shaped steel plate.

Further, the guard beam is adsorbed on the outer surface of the L-shaped steel plate by a magnet.

Further, the polymer material interlayer includes a component A polymer material and a component B polymer material;

The A component polymer material includes the following components by weight: 30-40 parts of castor oil, 60-70 parts of polyester polyol, 5-10 parts of small molecular polyol, 1-1.5 parts of coupling agent, auxiliary dose 0.5-1 serving;

The B component polymer material is polyisocyanate.

Further, the A-component polymer material is mixed with the B-component polymer material in a molar ratio of NCO/OH=1.0-1.2.

Further, the polyester polyol includes, but is not limited to, a mixture of one or more of polycaprolactone diol, polycaprolactone triol, and polytetrahydrofuran diol.

The present invention also provides a method for manufacturing a bridge reinforcement device based on a polymer metal composite material plate, comprising the following steps:

S1. The peripheral steel sheet is fixed to the upper wing plate and the connecting plate of the beam by welding or filling with steel structure adhesive, and the L-shaped steel plate is fixedly connected to the peripheral steel sheet to maintain an L-shaped interior. cavity;

S2. Drill 4 holes unilaterally on the L-shaped steel plate, and the 4 holes are all engraved with threads, one of which is set as a pouring hole to connect the polymer material pouring valve; the other three are set as exhaust holes, connected to exhaust valve;

S3, placing a guard beam on the outer surface of the L-shaped steel plate, and adsorbing the guard beam on the outer surface of the L-shaped steel plate with a magnet;

S4. Connect the exhaust funnel, mix the two-component materials, and inject them into the L-shaped cavity through the pouring hole, so that the polymer material fills the cavity to form a polymer material interlayer; after the pouring, remove the exhaust funnel, and the pouring time controlled within 10 minutes;

S5. After the pouring is completed, the guard beam is kept on the surface of the L-shaped steel plate for 1 hour and then removed.

Compared with the prior art, the present invention has the following advantages:

1. The bridge reinforcement device provided by the present invention increases the local fatigue resistance, prevents the expansion of fatigue cracks, and improves the overall strength and rigidity of the beam.

2. Compared with the reinforced steel structure and the steel-concrete composite structure, the bridge reinforcement device provided by the present invention has more uniform load transmission.

3. In the bridge reinforcement device provided by the present invention, the polymer material interlayer has a larger damping coefficient, and the vibration absorption characteristics of the original structure are significantly improved.

4. Compared with the carbon fiber reinforced composite material, the bridge reinforcement device provided by the present invention has lower cost of the interlayer of the polymer material, which can significantly improve the economy of use and maintenance.

5. The bridge reinforcement device provided by the present invention has simple structure and process, light weight and short production period.

Based on the above reasons, the present invention can be widely promoted in the fields of bridge reinforcement and the like.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of a fatigue crack at the connecting plate of an existing beam.

FIG. 2 is a three-dimensional shape diagram of the bridge reinforcement device of the present invention.

FIG. 3 is a schematic diagram of the connection mode of the bridge reinforcement device of the present invention.

In the figure: 1. Longitudinal beam; 2. Connecting plate; 3. Beam; 4. L-shaped steel plate; 5. Peripheral steel sheet; 6. Exhaust hole; 7. Pouring hole;

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise. Meanwhile, it should be understood that, for convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that the orientations indicated by orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and these orientation words do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as a limitation on the scope of protection of the present invention: the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under its device or structure". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of the present invention.

The horizontal and vertical connection structure of steel frame bridge is prone to fatigue cracks under the action of cyclic loads, as shown in Figure 1. For example, there are 40 horizontal and vertical connection members in the Royal Canyon Bridge, of which 80% have cracks, as shown in Figure 1 As shown, the crack starts at the top of the weld between the connecting plate and the beam web and propagates vertically downward under the cyclic tensile load caused by traffic. Whether it is at the connection between the longitudinal beam and the beam, or at the connection between the beam and the supporting beam, these cracks will cause structural damage to a certain extent, posing a threat to the safety of the bridge.

In view of the above problems, the present invention provides a bridge reinforcement device based on polymer metal composite material plates, as shown in Figs. The connecting plate 2 is vertically connected with the beam 3; the upper wing plate of the beam 3 and the connecting plate 2 are respectively provided with an L-shaped steel plate 4 that is fixedly connected to it, and the L-shaped steel plate 4 is connected with the upper wing plate and the connecting plate of the beam 3. A peripheral steel sheet 5 is arranged between the plates 2 ; the L-shaped steel plate 4 is provided with three exhaust holes 6 and a pouring hole 7 , and a polymer material interlayer 8 is poured in the pouring hole 7 . When pouring the polymer material interlayer 8 in the pouring hole 7 , a guard beam is provided on the outer surface of the L-shaped steel plate 4 . The guard beam is adsorbed on the outer surface of the L-shaped steel plate 4 by a magnet.

Further as a preferred embodiment of the present invention, the exhaust hole 6 and the pouring hole 7 are respectively engraved with threads, which are respectively used to connect the polymer material pouring valve and the exhaust valve.

Further as a preferred embodiment of the present invention, the metal structures in the present invention are made of low-cost steel materials, such as Q235, Q234, etc., and are made by a stamping process.

Further as a preferred embodiment of the present invention, the polymer material interlayer 8 includes a component A polymer material and a component B polymer material;

The A component polymer material includes the following components by weight: 30-40 parts of castor oil, 60-70 parts of polyester polyol (the polyester polyol includes but is not limited to polycaprolactone diol, One or more mixtures of polycaprolactone triol and polytetrahydrofuran diol), 5-10 parts of small molecular polyol, 1-1.5 parts of coupling agent, and 0.5-1 part of auxiliary;

The B component polymer material is polyisocyanate.

As a further preferred embodiment of the present invention, the A-component polymer material and the B-component polymer material are mixed in a molar ratio of NCO/OH=1.0-1.2.

The present invention also provides a method for manufacturing a bridge reinforcement device based on a polymer metal composite material plate, comprising the following steps:

S1, the peripheral steel sheet 5 is fixed on the upper wing plate and the connecting plate 2 of the beam 3 by welding or filling with a steel structure adhesive, and the L-shaped steel plate 4 is fixedly connected on the peripheral steel sheet 5 at the same time, Keep an L-shaped cavity inside;

S2. Drill 4 holes unilaterally on the L-shaped steel plate 4, and each of the 4 holes is engraved with threads, one of which is set as a pouring hole 7, and is connected to a polymer material pouring valve; the other three are set as exhaust holes 6. Connect the exhaust valve;

S3, place a guard beam on the outer surface of the L-shaped steel plate 4, and adsorb the guard beam on the outer surface of the L-shaped steel plate 4 with a magnet;

S4. Connect the exhaust funnel, mix the two-component materials, and inject them into the L-shaped cavity through the pouring hole, so that the polymer material fills the cavity to form the polymer material interlayer 8; after the pouring, remove the exhaust funnel and pour the The time is controlled within 10 minutes;

S5. After the pouring is completed, the guard beam is kept on the surface of the L-shaped steel plate 4 for 1 hour and then removed.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (8)

1. A bridge reinforcement device based on a polymer metal composite material plate, comprising a longitudinal beam (1) and a transverse beam (3) connected with the longitudinal beam (1) through a connecting plate (2), the connecting plate (2) and the The cross beam (3) is vertically connected; it is characterized in that the upper wing plate and the connecting plate (2) of the cross beam (3) are respectively provided with L-shaped steel plates (4) fixedly connected with them, and the L-shaped steel plates (4) ) and the upper wing plate and connecting plate (2) of the beam (3) are provided with a peripheral steel sheet (5); the L-shaped steel plate (4) is provided with three exhaust holes (6) and one pouring hole (6) A hole (7), a polymer material interlayer (8) is poured in the pouring hole (7). 2. The bridge reinforcement device based on the polymer metal composite material plate according to claim 1, characterized in that, the exhaust hole (6) and the pouring hole (7) are respectively engraved with threads, which are respectively used for connecting high Molecular materials cast valves and exhaust valves. 3. The bridge reinforcement device based on polymer metal composite material plate according to claim 1 or 2, characterized in that, when the polymer material interlayer (8) is poured in the pouring hole (7), in the L The outer surface of the profiled steel plate (4) is provided with a guard beam. 4. The bridge reinforcement device based on polymer metal composite material plate according to claim 3, characterized in that the guard beam is adsorbed on the outer surface of the L-shaped steel plate (4) by a magnet. 5. The bridge reinforcement device based on a polymer metal composite material plate according to claim 1, wherein the polymer material interlayer (8) comprises a component A polymer material and a component B polymer material; The A component polymer material includes the following components by weight: 30-40 parts of castor oil, 60-70 parts of polyester polyol, 5-10 parts of small molecular polyol, 1-1.5 parts of coupling agent, auxiliary dose 0.5-1 serving; The B component polymer material is polyisocyanate. 6 . The bridge reinforcement device based on the polymer metal composite material plate according to claim 5 , wherein the A-component polymer material and the B-component polymer material have a molar ratio of NCO/OH=1.0-1.2 Proportional mix. 7 . The bridge reinforcement device based on polymer metal composite material plate according to claim 5 , wherein the polyester polyols include but are not limited to polycaprolactone diol and polycaprolactone triol 7 . , a mixture of one or more of polytetrahydrofuran diols. 8. A method of making a bridge reinforcement device as claimed in any one of claims 1-7, characterized in that, comprising the steps of: S1. Fix the peripheral steel sheet (5) on the upper wing plate and the connecting plate (2) of the beam (3) by welding or filling with steel structure adhesive, and fix the L-shaped steel plate (4) on the An L-shaped cavity is formed inside the peripheral steel sheet (5); S2. Drill 4 holes unilaterally on the L-shaped steel plate (4), and each of the 4 holes is engraved with threads, one of which is set as a pouring hole (7), and is connected to a polymer material pouring valve; the other three are set For the exhaust hole (6), connect the exhaust valve; S3, placing a guard beam on the outer surface of the L-shaped steel plate (4), and adsorbing the guard beam on the outer surface of the L-shaped steel plate (4) with a magnet; S4. Connect the exhaust funnel, mix the two-component materials, and inject them into the L-shaped cavity through the pouring hole, so that the polymer material fills the cavity to form a polymer material interlayer (8); after the pouring, remove the exhaust funnel , the pouring time is controlled within 10 minutes; S5. After the pouring is completed, the guard beam is kept on the surface of the L-shaped steel plate (4) for 1 hour and then removed.

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