Self-repairing structure of reinforced concrete beam

Abstract

The present application relates to a kind of reinforced concrete beam self-repair structure, it is related to reinforced concrete secondary repair technical field.The reinforced concrete beam self-repair structure of the present application, including the first pipe body being arranged in the periphery of the steel body for forming reinforced concrete beam, second pipe body is arranged in the first pipe body, first pipe body and second pipe body form first accommodating cavity between, second pipe body has second accommodating cavity separated from first accommodating cavity in the inside, first accommodating cavity and second accommodating cavity are filled with repair liquid, first pipe body and second pipe body can be successively broken to sequentially release the repair liquid in its inside and repair reinforced concrete beam.Can realize the automatic secondary repair of reinforced concrete structure, improve the crack resistance of the tensile surface of concrete beam while realizing the secondary self-repair of crack in time, provide double protection for crack repair.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of secondary repair of reinforced concrete, in particular to a self-repairing structure of reinforced concrete beam. BACKGROUND

[0002] Reinforced concrete structure inevitably produces micro-cracks due to temperature changes, load effects and other factors. Although the micro-cracks of reinforced concrete usually do not directly endanger its load-bearing and other functions, after the cracks appear, they provide a path for water and harmful substances such as corrosive ions. With the passage of time, the fine cracks will also continuously expand and connect, eventually forming macroscopic cracks visible to the naked eye, accelerating the corrosion and deterioration of the steel bars inside, and reducing the durability of the structure. Therefore, repairing the concrete crack problem as soon as possible is an important measure to prolong the service life of the structure and reduce maintenance costs. Reinforced concrete beams are prone to cracks in the tensile state during use, so the prevention and repair of cracks in the tensile zone of the concrete beam is extremely important.

[0003] Cracks in concrete often occur during construction and normal service, but are difficult to predict. It is difficult for the naked eye to determine the location and size of the cracks in time. In actual engineering, even if detection is carried out, the detection results are all that the concrete cracks have developed to a certain extent, especially internal damage, which is difficult to find. For the detected concrete cracks, the traditional disposal scheme such as plastering and grouting, the way of artificially repairing the cracks from the outside, not only has high cost but also poor effect.

[0004] The self-repairing concept is a principle that some substances released by a biological tissue when the biological tissue is damaged or cracked automatically repair the damaged part. The self-repairing of concrete cracks overcomes the disadvantages of the traditional scheme, and the crack repairing mode changes from passive to active. In the prior art, the crystallization precipitation self-repairing does not depend on external means, but the repairing capacity is weak and difficult to control, and the repairing effect is unstable. The penetration crystallization self-repairing has a short time and a long effect, but the material is expensive and needs a water environment. The electro-deposition method self-repairing can effectively improve the impermeability of concrete, but the repair needs to be powered and is only suitable for hydraulic or harbor concrete structures. The self-repairing concrete mixed with microcapsules has a relatively obvious effect under the action of a quasi-static load, but the research is mostly based on the test level, and the application in actual projects is relatively insufficient, and it is not yet in the stage of wide application. The self-repairing based on magnesium oxide expanding agent has an obvious effect, but the activity and dosage of the expanding agent are difficult to control, which easily leads to poor working performance of the concrete mixture. The shape memory alloy self-repairing can be repeated, but the repair needs to be heated, and the range is limited. The fiber-reinforced self-repairing can better repair the cracks caused by stress or corrosion, and only has a good aggregation effect on cracks with a small width. The microbial self-repairing has the effects of permanent repair and active healing, but the technology is relatively complex, and the repairing effect is affected by many factors. The carbon fiber cloth reinforced self-repairing glass tube can effectively complete the self-repairing of concrete, but it no longer has the self-repairing ability when facing the problem of secondary cracking. SUMMARY

[0005] The self-repairing structure of the reinforced concrete beam can realize the automatic secondary repair of the reinforced concrete structure, improve the crack resistance of the tensile surface of the concrete beam, and realize the timely secondary self-repairing of the cracks, thereby providing double protection for crack repair.

[0006] The self-repairing structure of the reinforced concrete beam comprises a first pipe body arranged outside a steel body for forming a reinforced concrete beam, a second pipe body arranged inside the first pipe body, a first accommodating cavity formed between the first pipe body and the second pipe body, a second accommodating cavity inside the second pipe body and separated from the first accommodating cavity, and a repairing liquid filled in the first accommodating cavity and the second accommodating cavity. The first pipe body and the second pipe body can be broken in sequence to sequentially release the repairing liquid inside to repair the reinforced concrete beam.

[0007] In one embodiment, the first pipe body is internally provided with a plurality of the second pipe bodies, and all the second pipe bodies are arranged along the axial direction of the first pipe body. Through this embodiment, the second pipe bodies at different positions are independent of each other, so that the repair liquid in the second pipe bodies can be released for repair when the reinforced concrete beam breaks at different positions.

[0008] In one embodiment, the first pipe body and the reinforcing body are connected to each other through a connecting piece, and a plurality of the connecting pieces are uniformly arranged in the same direction. Through this embodiment, the integrity of the first pipe body for accommodating the repair liquid and the reinforcing body is maintained, so that the first pipe body always maintains the state of being attached to the reinforcing body during the formation of the reinforced concrete beam.

[0009] In one embodiment, the connecting piece is a fiber cloth strip. Through this embodiment, the flexible connection ensures that the first pipe body is fixed while avoiding accidental breakage at the connection, which may cause the repair liquid in the first pipe body to leak.

[0010] In one embodiment, one end of the first pipe body and the second pipe body is closed, and the other end is threadedly connected with a sealing cover. Through this embodiment, the repair liquid can be easily filled and sealed after filling.

[0011] In one embodiment, the first pipe body and the second pipe body are made of a brittle material. Through this embodiment, when the reinforced concrete beam cracks, the first pipe body and the second pipe body can break to release the repair liquid inside for repairing the reinforced concrete beam.

[0012] In one embodiment, the first pipe body and the second pipe body are made of one of urea-formaldehyde resin, polystyrene, silicon dioxide, ethyl cellulose, or hydroxypropyl methyl cellulose.

[0013] In one embodiment, the outer wall of the first pipe body is provided with an anti-skid structure to increase the static friction between the first pipe body and the reinforcing body. Through this embodiment, the integrity of the first pipe body and the reinforcing body is further improved, so that when the reinforced concrete beam cracks, the first pipe body will break under load when the reinforcing body bends.

[0014] In one embodiment, a plurality of the first pipe bodies are arranged in the same direction on the outer wall of the reinforcing body. Through this embodiment, the outer wall of the reinforcing body is provided with a plurality of first pipe bodies, so that when the reinforced concrete beam cracks at different positions and at different times, the first pipe body at the corresponding position can break to release the repair liquid inside for repair.

[0015] The above technical features can be combined in various suitable manners or replaced by equivalent technical features, as long as the objectives of the present application can be achieved.

[0016] The reinforced concrete beam self-repairing structure provided by the present application has at least the following advantages over the prior art.

[0017] Advantages:

[0018] When the reinforced concrete beam is broken, if the cracking degree is small, the first pipe body is broken to release the repairing liquid in the first accommodating cavity for repairing (at this time, the second pipe body is not broken), and if the reinforced concrete beam is cracked again after the repairing, the second pipe body is broken to release the repairing liquid in the second accommodating cavity for secondary repairing; if the cracking degree is large, the first pipe body and the second pipe body can also be broken at the same time to release the repairing liquid in the first accommodating cavity and the second accommodating cavity for automatic repairing. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be described in more detail below based on the embodiments and with reference to the drawings.

[0020] Figure 1 is a vertical sectional structure schematic diagram of the present application;

[0021] Figure 2 is a side sectional schematic diagram of Figure 1 ;

[0022] Figure 3 is an enlarged schematic diagram of the first pipe body and the second pipe body and the steel body section;

[0023] Figure 4 is a schematic diagram of the first time crack and the first time repairing of the present application;

[0024] Figure 5 is a schematic diagram of the second time crack and the second time repairing of the present application.

[0025] In the drawings, the same components are designated by the same reference numerals. The drawings are not drawn according to the actual proportions.

[0026] Reference numerals:

[0027] 1, reinforced concrete beam; 2, steel body; 3, first pipe body; 4, second pipe body; 5, repairing liquid; 6, first accommodating cavity; 7, second accommodating cavity; 8, connecting piece. DETAILED DESCRIPTION

[0028] The present application will be described in more detail below based on the embodiments and with reference to the drawings.

[0029] As Figures 1-3As shown, the present application provides a self-repairing structure of a reinforced concrete beam 1, which comprises a first pipe body 3 arranged outside a steel body 2 for forming the reinforced concrete beam 1, a second pipe body 4 arranged inside the first pipe body 3, a first accommodating cavity 6 formed between the first pipe body 3 and the second pipe body 4, a second accommodating cavity 7 inside the second pipe body 4 separated from the first accommodating cavity 6, and a repair liquid 5 filled in the first accommodating cavity 6 and the second accommodating cavity 7. The first pipe body 3 and the second pipe body 4 can be broken in sequence to release the repair liquid 5 inside to repair the reinforced concrete beam 1.

[0030] Specifically, during the preparation of the reinforced concrete beam 1, the first pipe body 3 and the second pipe body 4 need to be processed first, i.e. the second accommodating cavity 7 is filled with the repair liquid 5, then the second pipe body 4 is placed inside the first pipe body 3, the first accommodating cavity 6 is filled with the repair liquid 5 and the first pipe body 3 is sealed. The bundled steel body 2 is fixed in a pouring mold, then the sealed first pipe body 3 is bound outside the steel body 2, then the mold is poured with concrete, and finally curing and demolding are performed to form the reinforced concrete beam 1. The first repair is as shown in Figure 4 As shown, when the reinforced concrete beam 1 is broken due to load or other reasons, the first pipe body 3 is broken due to external force, the repair liquid 5 filled in the first accommodating cavity 6 flows out to repair the crack, and the second pipe body 4 is fixed. The second repair is as shown in Figure 5 As shown, when the crack is small, the repair liquid 5 in the first accommodating cavity 6 can also play a certain buffering role because the pipe diameter of the second pipe body 4 is smaller than that of the first pipe body 3. At this time, the second pipe body 4 will not be subjected to external force that can cause it to break, and the second pipe body 4 can maintain the state of sealing the second accommodating cavity 7. When the reinforced concrete beam 1 is subjected to external force for secondary cracking, the second pipe body 4 loses the protection of the first pipe body 3, the second pipe body 4 cracks, and the repair liquid 5 in the second accommodating cavity 7 flows out to repair the reinforced concrete for the second time, providing multiple self-repairing conditions for the crack while reducing the engineering cost, and providing double protection for crack repair. When the crack is large, the first pipe body 3 and the second pipe body 4 are subjected to a large pulling force, and the first pipe body 3 and the second pipe body 4 will break at one time, releasing the filling liquid inside the first accommodating cavity 6 and the second accommodating cavity 7 at the same time, to ensure that enough repair liquid 5 is provided to repair the crack. In theory, a third pipe body can also be sequentially arranged inside the second pipe body 4, and each time the outermost pipe body is broken for self-repairing, and the outermost pipe body is sequentially broken for multiple self-repairing, thereby realizing the function of multiple automatic repairing.

[0031] In one embodiment, a plurality of second tubes 4 are disposed inside the first tube 3, and all the second tubes 4 are arranged along the axial direction of the first tube 3. Through this embodiment, the second tubes 4 located at different positions are independent of each other, and it is possible to release the repair fluid 5 inside the second tubes 4 for repair when the reinforced concrete beam 1 breaks at different locations.

[0032] Specifically, all the second tubes 4 can be flexibly connected by a connecting structure, or no connecting structure can be provided. The overall length of all the second tubes 4 is slightly less than the length of the first tube 3, so that the second tubes 4 can move slightly axially inside the first tube 3.

[0033] In one embodiment, the first tube 3 and the reinforcing bar body 2 are connected to each other by connectors 8, and multiple connectors 8 are evenly arranged in the same direction. Through this embodiment, the first tube 3 used to contain the repair fluid 5 is kept as an integral part of the reinforcing bar body 2, ensuring that the first tube 3 remains in contact with the reinforcing bar body 2 throughout the process of forming the reinforced concrete beam 1.

[0034] Specifically, all the connectors 8 are evenly distributed to ensure the balanced force distribution on the first tube 3.

[0035] In one embodiment, the connector 8 is a fiber cloth strip. This embodiment employs a flexible connection method, ensuring the first tube 3 is fixed while preventing accidental breakage at the connection point, thus avoiding accidental leakage of the repair fluid 5 inside the first tube 3.

[0036] Specifically, connector 8 can also be an elastic rubber strip, etc.

[0037] In one embodiment, one end of the first tube 3 and the second tube 4 are closed, and the other end is threaded with a sealing cap. This embodiment, through the threaded connection, facilitates sealing after the repair fluid 5 has been filled.

[0038] Specifically, as a preferred embodiment, both the first tube 3 and the second tube 4 are in the form of a sealed cap with one end closed and the other end threadedly connected. Similarly, both ends of the first tube 3 and the second tube 4 can be connected by a sealed cap.

[0039] In one embodiment, both the first pipe 3 and the second pipe 4 are made of a fragile material. Through this embodiment, when cracks or other damage occur in the reinforced concrete beam, the first pipe 3 and the second pipe 4 can rupture to release the internal repair fluid 5 to repair the reinforced concrete beam 1.

[0040] In one embodiment, the first tube 3 and the second tube 4 are made of one of urea-formaldehyde resin, polystyrene, silica, ethyl cellulose or hydroxypropyl methylcellulose.

[0041] In one embodiment, the outer wall of the first pipe body 3 is provided with an anti-skid structure to increase the static friction between the first pipe body 3 and the steel body 2. Through this embodiment, the integrity of the first pipe body 3 and the steel body 2 is further improved, and when the reinforced concrete beam 1 cracks, the first pipe body 3 will be broken under load when the steel body 2 bends.

[0042] Specifically, the anti-skid structure can be anti-skid lines, or increase the surface roughness.

[0043] In one embodiment, a plurality of first pipe bodies 3 are arranged in the same direction on the outer wall of the steel body 2. Through this embodiment, the steel body 2 is provided with a plurality of first pipe bodies 3 on the outside, and when the reinforced concrete cracks at different positions and different times, the first pipe body 3 at the corresponding position can be broken to release the repair liquid 5 inside for repair.

[0044] Specifically, the first pipe body 3 is arranged on the lower side of the steel body 2, and for the same reason, the first pipe body 3 can also be arranged in the direction of the external load force received by the steel body 2, or a plurality of first pipe bodies 3 can be arranged circumferentially on the periphery of the steel body 2. Since the concrete in the compression area of the concrete beam is not prone to cracking, in order to avoid material waste and reduce engineering cost, the first pipe body 3 is mainly arranged in the tension zone. The steel body 2 is provided with a plurality of first pipe bodies 3 along the length direction, so that when different parts of the reinforced concrete beam 1 crack at the same time (or at different times), the first pipe body 3 at the corresponding position cracks to release the repair liquid 5 for repair.

[0045] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent parts can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A self-healing structure for a reinforced concrete beam, characterized by, The application relates to a reinforcing bar for reinforcing a reinforced concrete beam, which comprises a first pipe arranged outside a reinforcing bar body for forming the reinforced concrete beam, a second pipe arranged inside the first pipe, a first accommodating cavity formed between the first pipe and the second pipe, a second accommodating cavity arranged inside the second pipe and separated from the first accommodating cavity, and a repairing liquid filled in the first accommodating cavity and the second accommodating cavity, wherein the first pipe and the second pipe can be broken in sequence to release the repairing liquid in the first accommodating cavity and the second accommodating cavity to repair the reinforced concrete beam; a plurality of the first pipes are arranged on the outer wall of the reinforcing bar body in the same direction, a plurality of the second pipes are arranged inside the first pipes, and all the second pipes are arranged in the axial direction of the first pipe; the first pipe and the reinforcing bar body are connected by connecting pieces, a plurality of the connecting pieces are arranged in the same direction, the outer wall of the first pipe is provided with an anti-skid structure to increase the static friction between the first pipe and the reinforcing bar body.

2. A reinforced concrete beam self-repairing structure according to claim 1, characterized in that, The connecting piece is a fiber cloth strip.

3. A reinforced concrete beam self-repairing structure according to claim 1 or 2, characterized in that, One end of the first pipe and the second pipe is closed, and the other end is threadedly connected with a sealing cover.

4. The reinforced concrete beam self-repairing structure according to claim 1 or 2, characterized by, The first pipe and the second pipe are made of a fragile material.

5. A reinforced concrete beam self-repairing structure according to claim 4, characterized in that, The first pipe and the second pipe are made of one of urea-formaldehyde resin, polystyrene, silicon dioxide, ethyl cellulose and hydroxypropyl methyl cellulose.

6. The reinforced concrete beam self-repairing structure according to claim 1 or 2, characterized by, The repairing liquid is epoxy resin.

Images