Concrete beam strength repairing and strain monitoring structure
By setting up a predictable reinforcement layer with the ECC layer combined with the FRP rib on the concrete beam, and combining it with an optical fiber sensor for strain monitoring, the problem of difficult and poor results in the prior art concrete beam strength repair methods is solved, and effective improvement of structural strength and reliable monitoring of strain status is achieved.
Patent Information
- Application Number
- CN202421767167.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the prior art, the strength restoration method of concrete beams mainly uses cement-based materials to replace concrete in damaged parts of the beam, which is difficult to ensure the expected reinforcement effect.
A predictable reinforcement layer combining the ECC layer with the FRP rib is used. By setting an ECC layer on the beam substrate and embedded FRP ribs in it, and strain monitoring is achieved by combining an optical fiber sensor to achieve structural reinforcement and state monitoring.
The structural strength of the damaged beam is effectively improved, the expected reinforcement effect is achieved, and the strain status is monitored through optical fiber sensors to ensure the safety and reliability of repair.
Smart Images
Figure CN222810517U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to construction engineering technology, in particular to a concrete beam strength repair and strain monitoring structure. Background Art
[0002] Reinforced concrete beams are the main load-bearing and energy-consuming components of building structures. Existing concrete structures will be subject to various accidental loads such as impacts and collisions or natural environmental factors during service, which will cause the material properties to deteriorate and the structural strength to be weakened. These concrete beam structures can no longer meet the current building safety requirements, so they need to be reinforced or repaired or demolished and rebuilt; but reinforcement and repair are more feasible in terms of economy and time than demolition and reconstruction. And when the strength of the beam body is damaged, it is difficult to repair or replace the existing concrete beam matrix or internal steel bars.
[0003] Currently, most methods for repairing the strength of damaged beams are to use cement-based materials to replace the concrete in the damaged parts of the beams. This is difficult in specific construction operations and cannot guarantee the expected reinforcement effect. Utility Model Content
[0004] In view of the technical problems existing in the prior art, the purpose of the utility model is to provide a concrete beam strength repair and strain monitoring structure to solve the problem that most of the current strength repair methods for damaged beams are to use cement-based materials to replace the concrete in the damaged parts of the beams, which is difficult in specific construction operations and cannot guarantee the expected reinforcement effect.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A concrete beam strength repair and strain monitoring structure is arranged on a beam substrate, comprising: an ECC layer, arranged between the beam substrate and a mounting plate, FRP bars are arranged in the ECC layer, the FRP bars penetrate the ECC layer, and the extension direction of both ends of the ECC layer is consistent with the extension direction of both ends of the beam substrate; and the mounting plate is fixedly connected to the beam substrate and is used to clamp the ECC layer on the beam substrate.
[0007] As a preferred embodiment, the concrete beam strength repair and strain monitoring structure also includes an optical fiber sensor, which is arranged in the FRP bar. The two ends of the FRP bar are flush with the two ends of the ECC layer, and the two ends of the optical fiber sensor are respectively extended from the two ends of the FRP bar.
[0008] As a preferred embodiment, the FRP rib is provided with a groove extending along the axial direction of the FRP rib, the groove is smoothly arranged, and the optical fiber sensor is laid in the groove.
[0009] As a preferred embodiment, an adhesive layer is provided between the optical fiber sensor and the groove, and the adhesive layer is used to adhere the optical fiber sensor into the groove.
[0010] As a preferred embodiment, a protective adhesive layer is provided at the notch of the groove, and the protective adhesive layer is used to separate the optical fiber sensor and the ECC layer.
[0011] As a preferred embodiment, both ends of the FRP rib are provided with protective sleeves, the protective sleeves are sleeved on the outside of the optical fiber sensor, and the protective sleeves are sleeved on the ends of the FRP ribs.
[0012] As a preferred embodiment, a bonding layer is provided between the ECC layer and the beam substrate, and the bonding layer is used to bond the ECC layer to the beam substrate.
[0013] In general, the utility model has the following advantages:
[0014] 1. The concrete beam strength repair and strain monitoring structure of the utility model can effectively improve the strength of the damaged beam structure, including a predictable reinforcement layer made of FRP bars and ECC materials, which has high strength, high toughness and high durability. It can be designed according to the working conditions of the damaged beam and the expected repair strength, prefabricated in the factory in advance, and then glued with epoxy resin and anchored on the end by installing plates on site, so as to effectively improve the strength of the damaged beam structure.
[0015] 2. The utility model is a concrete beam strength repair and strain monitoring structure that can monitor the strain state of damaged concrete beams. A groove is made in the FRP bar, and an optical fiber sensor is embedded. The fiber optic sensor is encapsulated and protected with epoxy resin channels to ensure stable operation of the optical fiber sensor during construction, installation and normal use. The processed FRP bar has both tensile bearing and strain monitoring functions. In the later stage, the strain data derived from the optical fiber sensor can be analyzed to determine the strain state of the damaged beam, thereby ensuring the safety and reliability of the repaired beam.
[0016] 3. The reinforcement layer of the concrete beam strength repair and strain monitoring structure of the utility model is easy to process and produce. The predictable reinforcement layer made of FRP bars and ECC materials is convenient for batch production on factory assembly lines and has high economic efficiency. The installation process at the construction site is convenient to operate, saves time and effort, is less affected by the environment, and has strong applicability.
[0017] 4. The utility model combines the concrete beam structure with the distributed fiber grating sensor technology, provides a new idea for the strength repair design of damaged concrete beams, and is in line with the strategic goal of sustainable development of the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional schematic diagram of the concrete beam strength repair and strain monitoring structure.
[0019] Figure 2 It is the main exploded view of the concrete beam strength repair and strain monitoring structure.
[0020] Figure 3 It is a side view of the concrete beam strength repair and strain monitoring structure.
[0021] Figure 4 It is a top view of the concrete beam strength repair and strain monitoring structure.
[0022] Figure 5 It is the main view of the reinforcement layer of the concrete beam strength repair and strain monitoring structure.
[0023] Figure 6 It is a cross-sectional view of the reinforcement layer of the concrete beam strength repair and strain monitoring structure.
[0024] Figure 7 It is a cross-sectional view of the FRP bars in the concrete beam strength repair and strain monitoring structure.
[0025] Among them, 1 is the ECC layer, 11 is the reserved hole, 21 is the FRP rib, 22 is the optical fiber sensor, 23 is the adhesive layer, 24 is the protective layer, 25 is the protective cover, 3 is the mounting plate, 4 is the expansion bolt, 41 is the screw, 42 is the gasket, 43 is the nut, 5 is the adhesive layer, and 6 is the beam base. DETAILED DESCRIPTION
[0026] The present invention will be further described in detail below in conjunction with specific implementation methods.
[0027] like Figure 1-4As shown, the concrete beam strength repair and strain monitoring structure provided in this embodiment includes a reinforcement layer, a bonding layer 5 and a mounting plate 3. The reinforcement layer is a composite material layer formed by combining an ECC layer 1 and an FRP bar 21. First, the FRP bar 21 needs to be processed, and the side of the FRP bar 21 is grooved to form a groove. The groove surface of the groove is smoothed to ensure that there are no sharp protrusions in the groove. Then, the optical fiber sensor 22 is laid in the groove of the groove, and 502 glue is used as an adhesive layer 23. Then, the groove of the groove is filled with epoxy resin as a protective layer 24. The protective layer 24 is used to separate the groove from the ECC layer. A protective cover 25 is put on the end of the FRP bar; the processed FRP bar 21 is embedded in the ECC material 1, Make their extension directions consistent and their lengths the same, so that the two ends of the FRP tendon 21 are flush with the two ends of the ECC layer 1, and five reserved holes 11 are set in the ECC layer. After the ECC layer 1 solidifies, it forms a prefabricated reinforcement layer with the FRP tendon 21; first, the tensile side surface of the beam base 6 is roughened to expose the coarse aggregate on the surface, and the prefabricated reinforcement layer is pasted to the tensile side of the beam body using epoxy resin as the bonding layer 5. After the epoxy resin is solidified, holes are drilled according to the positions of the reserved holes 11 of the reinforcement layer to form slots on the beam base 6 that communicate with the reserved holes 11. After removing the dust from the slots, expansion bolts 4 are driven in, and the anchor mounting plate 3 is installed using the expansion bolts 4. The reinforcement layer is anchored and clamped on the beam base 6 at the ends using the mounting plate 3. The beam base is a damaged beam.
[0028] As shown in Figures 5 to 7, the FRP rib 21 embedded in the ECC layer 1 needs to be grooved to embed the optical fiber sensor 22. The groove width should be 1.5mm to 2.5mm to ensure the effective cross-section of the FRP rib. The loss of cross-sectional area caused by the groove needs to be considered in the design. The groove wall needs to be smoothed before using 502 glue to paste the optical fiber to avoid damage to the optical fiber sensor 22 during installation. Then, the groove is encapsulated with epoxy resin. After the epoxy resin solidifies, the surface debris of the FRP rib 21 is cleaned again. After the FRP rib 21 is encapsulated with epoxy resin, protective sleeves 25 must be put on both ends, and it must be ensured that the ends of the protective sleeves 25 extend out of the ECC layer 1 during the reinforcement layer production process.
[0029] like Figures 5 to 7 The reinforcement layer is composed of ECC material 1 and FRP bars 21. The FRP bars 21 are preferably made of FRP materials with greater ductility, such as basalt FRP bars. The size of the FRP bars 21 can be designed according to the working conditions of the beam to be repaired. The processed FRP bars 21 are embedded in the middle of the ECC matrix and are evenly and equidistantly arranged in both directions. Before the initial setting of the ECC layer 1, five holes are reserved at the staggered FRP bar 21 sub-packaging positions at both ends.
[0030] like Figures 1 to 7The base of the reinforcement layer is made of ECC material to form an ECC layer 1. The ECC material is a high-ductility cement-based material. The embedded FRP bars 21 are made of FRP materials with high ductility. Before pasting the reinforcement layer, the pasting surface of the beam matrix 6 needs to be roughened so that the coarse aggregate on the surface of the beam matrix 6 is exposed. After the reinforcement layer is prefabricated, epoxy resin is used for pasting, and the pasting position is the tensile side of the beam body. After the reinforcement layer is pasted, the end mounting plate 3 needs to be anchored. The mounting plate anchoring needs to wait for the epoxy resin to solidify and generate strength before it can be carried out. The anchoring installation needs to drill holes at the end of the reinforcement layer, and the drilling position needs to avoid the FRP bars 21 in the ECC layer 1. After drilling, a high-power hair dryer needs to be used to clean the dust in the hole. After installing the expansion bolt screw 41, the mounting plate 3 and the bolt gasket 42 in sequence, tighten the nut 43 from the inside out.
[0031] The specific implementation process of the concrete beam strength repair and strain monitoring structure is as follows: first, the FRP bar 21 is processed, and the side of the FRP bar 21 is grooved. In order to ensure the effective cross-section of the FRP bar, the groove width is 1.5mm~2.5mm, and the groove surface is smoothed. 502 glue is used as the bonding layer 23 to evenly bond and fix the optical fiber sensor 22 along the groove, and then epoxy resin is used as the protective layer 24 to encapsulate the groove, and a protective cover is put on the end of the FRP bar 21; the processed FRP bar 21 is embedded in the ECC layer 1, and the ECC layer 1 forms a prefabricated reinforcement layer after solidification; then the tensile side surface of the beam base 6 is roughened to expose the coarse aggregate on the surface, and the prefabricated reinforcement layer is pasted to the tensile side of the beam body using epoxy resin as the bonding layer 5, and drilling is performed after the epoxy resin solidifies. The drilling position is determined according to the hole at the end of the prefabricated reinforcement layer; after drilling, a high-power hair dryer is used to clean the dust in the hole, and the expansion bolt screw 41, the mounting plate 3 and the bolt gasket 42 are installed in sequence, and the nut 43 is tightened from the inside to the outside.
[0032] In general, the concrete beam strength repair and strain monitoring structure of the utility model is easy to make, convenient for batch production on factory assembly lines, and highly economical. The installation process on the construction site is easy to operate, saving time and effort, less affected by the environment, and highly applicable. At the same time, the utility model combines the concrete beam structure with the distributed fiber grating sensor technology, providing a new idea for the strength repair design of the damaged concrete beam, and is in line with the strategic goal of sustainable development of the construction industry.
[0033] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A concrete beam strength repair and strain monitoring structure, arranged on a beam base, characterized in that: include: The ECC layer is arranged between the beam matrix and the mounting plate, and FRP ribs are arranged in the ECC layer. The FRP ribs penetrate the ECC layer, and the extension direction of the two ends of the ECC layer is consistent with the extension direction of the two ends of the beam matrix; The mounting plate is fixedly connected to the beam matrix and is used to clamp the ECC layer on the beam matrix.
2. A concrete beam strength repair and strain monitoring structure according to claim 1, characterized in that: It also includes an optical fiber sensor, which is arranged in the FRP rib, with two ends of the FRP rib flush with two ends of the ECC layer, and two ends of the optical fiber sensor extending out from two ends of the FRP rib respectively.
3. A concrete beam strength repair and strain monitoring structure according to claim 2, characterized in that: The FRP bar is provided with a groove extending along the axial direction of the FRP bar, the groove is smoothly arranged, and the optical fiber sensor is laid in the groove.
4. A concrete beam strength repair and strain monitoring structure according to claim 3, characterized in that: An adhesive layer is provided between the optical fiber sensor and the groove, and the adhesive layer is used to adhere the optical sensor in the groove.
5. A concrete beam strength repair and strain monitoring structure according to claim 3, characterized in that: A protective adhesive layer is provided at the notch of the groove, and the protective adhesive layer is used to space the optical fiber sensor and the ECC layer.
6. A concrete beam strength repair and strain monitoring structure according to claim 2, characterized in that: Both ends of the FRP bar are provided with protective sleeves, which are sleeved on the outer side of the optical fiber sensor and are sleeved on the end of the FRP bar.
7. A concrete beam strength repair and strain monitoring structure according to claim 1, characterized in that: An adhesive layer is provided between the ECC layer and the beam substrate, and the adhesive layer is used to bond the ECC layer to the beam substrate.