Reinforced concrete beam bending-resistant reinforcing device and reinforced concrete beam
By setting up a high-ductile concrete surface layer at the bottom of the reinforced concrete beam and burying the iron-based shape memory alloy ribs, the problem of high environmental requirements of traditional reinforcement methods is solved, bending bearing capacity and structural durability are improved, and it is suitable for a variety of environments.
Patent Information
- Application Number
- CN202422640266.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-30
AI Technical Summary
The traditional bending reinforcement method of reinforced concrete beams has high environmental requirements and great limitations, and has poor results in environments with high humidity or temperature, which affects the service life and bearing capacity of the structure.
A high-ductile concrete surface layer is installed at the bottom of the reinforced concrete beam, and an iron-based shape memory alloy reinforcement is buried. The recovery stress of the iron-based shape memory alloy is used to convert it into the prestress of the high-ductile concrete surface layer to limit the cracking of the beam and slow down the corrosion through fine cracks.
It improves the bending bearing capacity of reinforced concrete beams, reduces moisture infiltration, extends the structure life, has a wide range of application, good economy, and reduces the impact on the original structure.
Smart Images
Figure CN223281766U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building structure reinforcement, and particularly relates to a reinforced concrete beam anti-bending reinforcement device and a reinforced concrete beam. Background Art
[0002] Reinforced concrete beams are the main force-transmitting components in reinforced concrete structures. Under the influence of various adverse environmental factors, the concrete performance deteriorates and the steel bars are severely corroded. Secondly, due to the development of cracks in the tension zone, moisture can easily penetrate into the original components, further aggravating the corrosion of the steel bars. Due to the change in the use function of the structure, the bending bearing capacity of the reinforced concrete beams is seriously insufficient.
[0003] At present, traditional methods for strengthening reinforced concrete beams against bending generally have high requirements for the working environment and large limitations, such as: increasing the cross-section method, bonding steel method and prestressed reinforcement method; specifically, increasing the cross-section method will greatly reduce the usable space of the building; the reinforcement effect of the bonding steel method depends on the level of adhesive, and there are problems such as aging of structural adhesive, poor high-temperature resistance, and easy rusting of steel plates, which limit the bonding steel method to be unsuitable for environments with high relative humidity and temperature; the prestressed reinforcement method has less impact on the space of the original structure, but is not suitable for working environments with high humidity and structures with large creep. Utility Model Content
[0004] In response to the technical problems existing in the prior art, the utility model provides a reinforced concrete beam bending reinforcement device and a reinforced concrete beam to solve the technical problems that traditional reinforced concrete beam bending reinforcement methods generally have high requirements on the working environment and large limitations.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] The utility model provides a reinforced concrete beam bending reinforcement device, comprising a concrete surface layer and reinforcement materials; the concrete surface layer is arranged on the bottom surface of the reinforced concrete original beam; the reinforcement materials are arranged in the concrete surface layer and along the axial direction of the reinforced concrete original beam; wherein the concrete surface layer is a high-ductility concrete layer, and the reinforcement materials are iron-based shape memory alloys.
[0007] Furthermore, the concrete surface layer includes a first concrete surface layer and a second concrete surface layer; the first concrete surface layer is arranged on the bottom surface of the reinforced concrete original beam, and the second concrete surface layer is arranged on the surface of the first concrete surface layer; the reinforcement material is arranged between the first concrete surface layer and the second concrete surface layer.
[0008] Furthermore, the thickness of the concrete surface layer is 15-30 mm.
[0009] Furthermore, the pre-stretching elongation of the reinforcement is 1%-8%.
[0010] Furthermore, the reinforcement can generate a preset recovery stress under heating conditions after being pre-stretched; wherein, the heating temperature is 100-450° C. and the recovery stress is 200-500 MPa.
[0011] Furthermore, the diameter of the reinforcement is 5-18 mm.
[0012] Furthermore, the number of the reinforcements is two, and the two reinforcements are symmetrically arranged about the axis of the reinforced concrete original beam.
[0013] Furthermore, the first concrete surface layer and the second concrete surface layer have the same thickness.
[0014] Furthermore, the end of the reinforcement is also connected to an external power supply; wherein, the external power supply is used to electrically heat the reinforcement.
[0015] The utility model also provides a reinforced concrete beam, comprising a reinforced concrete original beam and a reinforcement device, wherein the reinforcement device is arranged at the bottom of the reinforced concrete original beam; wherein the reinforcement device adopts the reinforced concrete beam bending reinforcement device
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] The utility model provides a reinforced concrete beam bending reinforcement device, which arranges a high-ductility concrete surface layer at the bottom of the original reinforced concrete beam, and buries iron-based shape memory alloy reinforcement in the high-ductility concrete surface layer. By utilizing the bonding effect between the iron-based shape memory alloy and the high-ductility concrete, the recovery stress of the iron-based shape memory alloy is indirectly converted into prestressed stress inside the high-ductility concrete surface layer, which effectively limits the cracking of the reinforced concrete beam and significantly improves the bending bearing capacity of the reinforced member in the normal use stage. The utility model has low requirements for the working environment and a wide range of applications. Secondly, the high-ductility concrete surface layer is thin in thickness, has good economy, and has little impact on the original structure. At the same time, since the high-ductility concrete surface layer has the characteristic of multiple cracks, the cracks are fine and dense, and the fine cracks can reduce the infiltration of moisture into the original reinforced concrete beam, slow down the corrosion of the original beam steel bars, and form effective protection for the original beam. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A longitudinal cross-sectional view of the reinforced concrete beam flexural reinforcement device provided in Example 1;
[0019] Figure 2 This is a transverse cross-sectional view of the reinforced concrete beam flexural reinforcement device provided in Example 1.
[0020] Among them, 1 concrete surface layer, 2 reinforcement materials; 100 reinforced concrete original beam; 11 first concrete surface layer, 12 second concrete surface layer. DETAILED DESCRIPTION
[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0022] Example 1
[0023] As attached Figure 1-2 As shown, this embodiment 1 provides a reinforced concrete beam bending reinforcement device, including a concrete surface layer 1 and reinforcement 2; the concrete surface layer 1 is arranged on the bottom surface of the reinforced concrete original beam 100, and the reinforcement 2 is arranged in the concrete surface layer 1 and along the axial direction of the reinforced concrete original beam 100.
[0024] In this embodiment 1, the concrete surface layer 1 is a high-ductility concrete layer of preset thickness, which is formed by pressing and troweling high-ductility concrete; wherein the preset thickness of the high-ductility concrete layer is 15-30mm. Preferably, the raw materials of the high-ductility concrete include cement, fly ash, silica fume, sand, PVA fiber and water; wherein, by mass percentage, cement: fly ash: silica fume: sand: water = 1:0.9:0.1:0.76:0.58; based on the total volume of cement, fly ash, silica fume, sand and water after uniform mixing, the volume content of PVA fiber is 1.5%; due to the incorporation of PVA fiber, after the high-ductility concrete cracks, the PVA fiber at the crack can transmit tensile stress, thereby limiting the width of the crack, and the crack exhibits fine and dense characteristics.
[0025] The concrete surface layer 1 includes a first concrete surface layer 11 and a second concrete surface layer 12. The first concrete surface layer 11 is arranged on the bottom surface of the reinforced concrete original beam 100, and the second concrete surface layer 12 is arranged on the surface of the first concrete surface layer 11. The reinforcement 2 is arranged between the first concrete surface layer 11 and the second concrete surface layer 12; wherein, the first concrete surface layer 11 and the second concrete surface layer 12 are set to the same thickness.
[0026] In this embodiment 1, the reinforcement 2 is made of an iron-based shape memory alloy, that is, the iron-based shape memory alloy is embedded in the concrete surface layer 1 in the form of reinforcement; the reinforcement 2 can generate a preset recovery stress under heating conditions after pre-stretching; preferably, the pre-stretching elongation of the reinforcement 2 is 1%-8%, and the diameter is 5-18mm; at a heating temperature of 100-450°C, the recovery stress is 200-500MPa; preferably, the chemical composition of the reinforcement 2 includes, by weight percentage: 15% manganese, 5% silicon, 5% nickel, 8% chromium, 0-1% nitrogen, 0-4% vanadium, 0-0.2% carbon and the balance iron.
[0027] In this embodiment 1, an external power supply is further included; the external power supply is connected to the end of the reinforcement 2 and is used to electrically heat the reinforcement 2 so that the reinforcement 2 generates a preset recovery stress.
[0028] The concrete steps for constructing the reinforced concrete beam bending reinforcement device of the present invention are as follows:
[0029] Step 1: Pre-stretch the reinforcement 2 to obtain the pre-stretched reinforcement 2.
[0030] Step 2: Prepare high-ductility concrete according to the preset mix ratio requirements; apply high-pressure concrete to the bottom surface of the reinforced concrete original beam 100 to form a first concrete surface layer 11; wherein the applied thickness of the high-ductility concrete in the first concrete surface layer 11 is half the thickness of the concrete surface layer 1.
[0031] Step 3: Arrange the pre-stretched reinforcement 2 on the surface of the first concrete surface layer 11.
[0032] Step 4: Press and apply high-ductility concrete on the surface of the first concrete surface layer 11 to form a second concrete surface layer 12 . Thus, a concrete surface layer 1 is formed on the bottom surface of the reinforced concrete original beam 100 .
[0033] Step 5: After the high-ductility concrete of the concrete surface layer 1 is cured, the reinforcement 2 is electrically heated by an external power supply to form a high-ductility concrete reinforced surface layer with prestress, that is, the construction of the reinforced concrete beam bending reinforcement device is completed.
[0034] Working principle:
[0035] The reinforced concrete beam bending reinforcement device described in the present invention forms a concrete surface layer by pressing high-ductility concrete on the bottom surface of the reinforced concrete original beam, and buries iron-based shape memory alloy reinforcement in the high-ductility concrete surface layer. By utilizing the bonding effect between the iron-based shape memory alloy and the high-ductility concrete, the recovery stress of the iron-based shape memory alloy is indirectly converted into prestressed stress inside the high-ductility concrete surface layer, effectively limiting the cracking of the reinforced concrete beam and significantly improving the bending bearing capacity of the test piece during normal use.
[0036] Project example description:
[0037] Taking the anti-bending reinforcement construction process of a reinforced concrete original beam as an example, the reinforced concrete beam anti-bending reinforcement device in this embodiment 1 is described in detail; wherein the dimensional characteristics of the reinforced concrete original beam are: length × width × height = 2000mm × 150mm × 200mm.
[0038] In this engineering example, the thickness of the concrete surface layer is 15 mm; that is, the thickness of the first concrete surface layer and the second concrete surface layer are both 7.5 mm; the diameter of the reinforcement is 8 mm and the length is 2000 mm; the number of reinforcements is two, and the two reinforcements are symmetrically arranged about the axis of the reinforced concrete original beam; the pre-tensioning elongation of the reinforcement is 4%, and the recovery stress is 200 MPa at a heating temperature of 100°C.
[0039] Construction process: Pre-stretch the reinforcement to obtain pre-stretched reinforcement; mix high-ductility concrete according to the mix ratio, and press the first layer of high-ductility concrete with a thickness of 7.5mm on the bottom surface of the original reinforced concrete beam; lay the pre-stretched reinforcement on the surface of the first layer of high-ductility concrete, and arrange it symmetrically along the axis of the original reinforced concrete beam; then, press the second layer of high-ductility concrete with a thickness of 7.5mm; after the high-ductility concrete is cured, the reinforcement is electrified to heat the iron-based shape memory alloy to a temperature of 100°C, so that the iron-based shape memory alloy generates a recovery stress of 200MPa; due to the bonding effect between the iron-based shape memory alloy and the high-ductility concrete surface layer, a preset prestress is generated inside the reinforcement layer, which effectively limits the cracking of the reinforced beam and greatly improves its bending bearing capacity during normal use.
[0040] Example 2
[0041] This embodiment 2 provides a reinforced concrete beam, including a reinforced concrete original beam and a reinforcement device, wherein the reinforcement device is arranged at the bottom of the reinforced concrete original beam; wherein the reinforcement device adopts the reinforced concrete beam anti-bending reinforcement device described in the above embodiment 1; for the structure and construction process of the reinforced concrete anti-bending reinforcement device, please refer to the contents of the above embodiment 1 for details, which will not be repeated here.
[0042] The reinforced concrete beam bending reinforcement device described in the present invention forms a concrete surface layer by pressing high-ductility concrete on the bottom surface of the reinforced concrete original beam, and arranges iron-based shape memory alloy as reinforcement material inside the high-ductility concrete surface layer; the high-ductility concrete surface layer is thin, economical, and has little impact on the original structure; secondly, the high-ductility concrete surface layer has the characteristic of multiple cracks, and the cracks are fine and dense. The small cracks can reduce the infiltration of moisture into the original reinforced concrete beam, slow down the corrosion of the original beam steel bars, form effective protection for the original beam, effectively reduce the impact of the external environment on the reinforced structure, and improve the durability and applicability of the structure.
[0043] It should be noted that the iron-based shape memory alloy is a special metal material with a shape memory effect. After pre-stretching, the iron-based shape memory alloy will return to its original shape when heated to a preset temperature range; therefore, applying constraints to both ends of the iron-based shape memory alloy before heating will generate recovery stress inside the iron-based shape memory alloy; in the present invention, the iron-based shape memory alloy is embedded in the high-ductility concrete surface layer, and the bonding effect between the iron-based shape memory alloy and the high-ductility concrete is utilized. The recovery stress of the iron-based shape memory alloy will be indirectly converted into prestress inside the high-ductility concrete surface layer, effectively limiting the cracking of the reinforced concrete beam and significantly improving the bending bearing capacity of the specimen during normal use.
[0044] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes within the technical scope disclosed by the present invention, any changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field.
Claims
1. A reinforced concrete beam bending reinforcement device, characterized in that: The invention comprises a concrete surface layer (1) and reinforcement (2); the concrete surface layer (1) is arranged on the bottom surface of a reinforced concrete original beam (100); the reinforcement (2) is arranged in the concrete surface layer (1) and along the axial direction of the reinforced concrete original beam (100); wherein the concrete surface layer (1) is a high-ductility concrete layer, and the reinforcement (2) is an iron-based shape memory alloy.
2. A reinforced concrete beam bending reinforcement device according to claim 1, characterized in that: The concrete surface layer (1) comprises a first concrete surface layer (11) and a second concrete surface layer (12); the first concrete surface layer (11) is arranged on the bottom surface of the reinforced concrete original beam (100), and the second concrete surface layer (12) is arranged on the surface of the first concrete surface layer (11); the reinforcement material (2) is arranged between the first concrete surface layer (11) and the second concrete surface layer (12).
3. The reinforced concrete beam bending reinforcement device according to claim 1, characterized in that: The thickness of the concrete surface layer (1) is 15-30 mm.
4. The reinforced concrete beam bending reinforcement device according to claim 1, characterized in that: The pre-stretching elongation of the reinforcement (2) is 1%-8%.
5. The reinforced concrete beam bending reinforcement device according to claim 4, characterized in that: The reinforcement (2) can generate a preset recovery stress under heating conditions after being pre-stretched; wherein the heating temperature is 100-450° C. and the recovery stress is 200-500 MPa.
6. The reinforced concrete beam bending reinforcement device according to claim 1, characterized in that: The diameter of the reinforcement (2) is 5-18 mm.
7. The reinforced concrete beam bending reinforcement device according to claim 1, characterized in that: The number of the reinforcement materials (2) is two, and the two reinforcement materials (2) are symmetrically arranged about the axis of the reinforced concrete original beam (100).
8. The reinforced concrete beam bending reinforcement device according to claim 2, characterized in that: The first concrete surface layer (11) and the second concrete surface layer (12) have the same thickness.
9. The reinforced concrete beam bending reinforcement device according to claim 5, characterized in that: The end of the reinforcement material (2) is also connected to an external power supply; wherein the external power supply is used to electrically heat the reinforcement material (2).
10. A reinforced concrete beam, characterized in that: The invention comprises a reinforced concrete original beam (100) and a reinforcement device, wherein the reinforcement device is arranged at the bottom of the reinforced concrete original beam (100); wherein the reinforcement device adopts the reinforced concrete beam bending reinforcement device according to any one of claims 1 to 9.