Bridge pier reinforcing structure

Abstract

The utility model relates to a pier reinforcing structure, in particular to the technical field of bridge engineering. The device comprises a bridge pier, a steel bar planting hole, an L-shaped steel bar, a pipeline, piezoelectric intelligent elements, a connecting line, a signal generator, a steel formwork, a PZT strain gauge and a signal acquisition system, the signal generator is used for applying an electric excitation signal to one or more piezoelectric intelligent elements, driving piezoelectric ceramics in the piezoelectric intelligent elements are driven to generate vibration, vibration waves are diffused outwards, and the piezoelectric intelligent elements are driven to generate vibration. The PZT strain gauges at the measuring points receive vibration signals and convert the vibration signals into electric signals, the electric signals are collected by the signal collecting system, and time domain analysis, frequency domain analysis and time-frequency domain analysis are carried out on the collected signals so as to monitor the bonding condition of the externally-wrapped reinforced concrete and the old pier and evaluate the reinforcing effect. The technical problems that the combination condition between new concrete and old concrete is actively monitored, and the pier reinforcing effect is effectively evaluated are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a bridge pier reinforcement structure. Background Art

[0002] Traditional reinforced concrete bridge piers are prone to peeling, cracking, steel corrosion and other defects in external corrosive environments such as the ocean, inadequate construction, local collisions, and water erosion, which reduces the durability of the bridge piers. In order to eliminate traffic safety hazards, extend the service life of bridges, or enable bridge piers to meet greater bearing capacity requirements, damaged bridge piers need to be reinforced. The method of increasing the cross-section is a commonly used method for pier reinforcement. The effective combination of new and old concrete before and after reinforcement is the basis for ensuring and improving the cross-section bearing capacity. However, there is a lack of practical technical solutions to effectively evaluate the reinforcement effect. Commonly used methods such as ultrasonic methods are difficult to effectively implement in reinforced bridge piers. The increase in cross-section also increases the difficulty of actively monitoring the reinforcement effect. Utility Model Content

[0003] (1) Technical solution

[0004] In order to solve the above technical problems, the utility model provides a pier reinforcement structure, including a pier, a reinforcement hole, an L-shaped steel bar, a pipeline, a piezoelectric intelligent element, a connecting line, a signal generator, a steel template, a PZT strain gauge, and a signal acquisition system. The pier is provided with a plurality of groups of reinforcement holes equidistantly opened in the vertical direction, each group containing a plurality of reinforcement holes uniformly distributed in a circular shape along the cross section of the pier, the L-shaped steel bars are arranged in the reinforcement holes, the number of the pipelines is three and they are longitudinally fixed at equal intervals along the surface of the pier, a signal cable is arranged in the pipeline, the piezoelectric intelligent element is buried in the reinforcement hole, one end of the signal cable is connected to the signal generator, and the other end is connected to the piezoelectric intelligent element through the connecting line, the outer periphery of the pier is provided with an annular steel template, steel bars are tied between the inner wall of the steel template and the outer wall of the pier, and concrete is poured to form an enlarged cross-section portion, the PZT strain gauge is pasted on the outer wall of the enlarged cross-section portion, and the PZT strain gauge is electrically connected to the signal acquisition system.

[0005] Preferably, the pipeline is a PVC pipe.

[0006] Preferably, at least three piezoelectric intelligent elements are arranged on the same plane of the pier.

[0007] Preferably, the piezoelectric intelligent element is composed of a driving piezoelectric ceramic, a waterproof layer and cement-wrapped aggregate in sequence from the inside to the outside.

[0008] Preferably, the waterproof layer is made of epoxy resin.

[0009] Preferably, the distance between the inner wall of the steel formwork and the outer wall of the pier is 15-30 cm.

[0010] Preferably, a group of the PZT strain gauges is pasted every 50-100 cm on the enlarged cross-section portion along the vertical direction of the pier, and each group contains at least 3 PZT strain gauges equidistantly distributed in a ring shape along the outer wall of the enlarged cross-section portion.

[0011] Preferably, the signal acquisition system is a high-frequency signal acquisition instrument.

[0012] (2) Beneficial effects

[0013] The utility model provides a bridge pier reinforcement structure, using a signal generator to apply an electric excitation signal to a single or multiple piezoelectric intelligent elements, the driving piezoelectric ceramic in the piezoelectric intelligent element will vibrate when driven, and the vibration wave will spread outward, and the vibration signal will be received by the PZT strain gauge at the measuring point and converted into an electrical signal, which will be collected by a signal acquisition system, and the collected signals will be analyzed in the time domain, frequency domain, and time-frequency domain respectively, so as to monitor the bonding condition between the outer reinforced concrete and the old bridge pier and evaluate the reinforcement effect, thereby solving the technical problem of actively monitoring the bonding condition between the new and old concrete and effectively evaluating the bridge pier reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the utility model.

[0015] Figure 2 It is a top view of the utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the piezoelectric intelligent component of the utility model.

[0017] The accompanying drawings are marked as follows: 1-bridge pier, 2-rebar embedding hole, 3-L-shaped steel bar, 4-pipeline, 5-piezoelectric intelligent element, 51-cement-wrapped aggregate, 52-waterproof layer, 53-driving piezoelectric ceramic, 6-connecting line, 7-signal generator, 8-steel formwork, 9-PZT strain gauge, 10-signal acquisition system. DETAILED DESCRIPTION

[0018] The utility model is further described in conjunction with the accompanying drawings and embodiments.

[0019] like Figures 1 to 3As shown, a bridge pier reinforcement structure described in the utility model includes a bridge pier 1, a reinforcement hole 2, an L-shaped steel bar 3, a pipeline 4, a piezoelectric intelligent element 5, a connecting line 6, a signal generator 7, a steel template 8, a PZT strain gauge 9, and a signal acquisition system 10. The bridge pier 1 is provided with a plurality of groups of reinforcement holes 2 equidistantly opened in the vertical direction, each group containing a plurality of reinforcement holes 2 uniformly distributed in a circular shape along the cross section of the bridge pier 1, the L-shaped steel bar 3 is arranged in the reinforcement hole 2, the number of the pipelines 4 is three and they are longitudinally fixed at equal intervals along the surface of the bridge pier 1, A signal cable is arranged in the pipeline 4, the piezoelectric intelligent element 5 is buried in the reinforcement hole 2, one end of the signal cable is connected to the signal generator 7, and the other end is connected to the piezoelectric intelligent element 5 through the connecting line 6. The outer periphery of the pier 1 is provided with a ring-shaped steel template 8, and steel bars are tied between the inner wall of the steel template 8 and the outer wall of the pier 1, and concrete is poured to form an enlarged cross-section portion, and the PZT strain gauge 9 is pasted on the outer wall of the enlarged cross-section portion, and the PZT strain gauge 9 is electrically connected to the signal acquisition system 10.

[0020] Furthermore, the pipeline 4 is a PVC pipe.

[0021] Furthermore, at least three piezoelectric intelligent components 5 are arranged on the same plane of the pier 1 .

[0022] Furthermore, the piezoelectric intelligent element 5 is composed of a driving piezoelectric ceramic 53 , a waterproof layer 52 and a cement-wrapped aggregate 51 in sequence from the inside to the outside.

[0023] Furthermore, the waterproof layer 52 is made of epoxy resin.

[0024] Furthermore, the distance between the inner wall of the steel formwork 8 and the outer wall of the pier 1 is 15-30 cm.

[0025] Furthermore, a group of the PZT strain gauges 9 is pasted every 50-100 cm along the vertical direction of the pier 1 on the enlarged cross-section portion, and each group contains at least 3 PZT strain gauges 9 equidistantly distributed in a circular shape along the outer wall of the enlarged cross-section portion.

[0026] Furthermore, the signal acquisition system 10 is a high-frequency signal acquisition instrument.

[0027] A monitoring method for a bridge pier reinforcement structure comprises the following steps:

[0028] (1) Chiseling

[0029] The surface concrete of the bridge pier 1 to be reinforced is roughened by about 1 cm, in order to increase the surface friction of the old concrete and strengthen the surface bonding of the new and old concrete.

[0030] (2) Drilling and reinforcing bars

[0031] Before drilling, the reinforcement of the bridge pier 1 needs to be inspected, and holes are drilled after avoiding the positions of the longitudinal reinforcement and stirrups, and L-shaped reinforcement 3 is implanted in the holes.

[0032] (3) Bury piezoelectric smart components and install longitudinal pipes and cables

[0033] The three pipes 4 are longitudinally fixed at equal intervals along the surface of the pier 1 . The purpose of installing the pipes is to lay signal cables inside.

[0034] Piezoelectric smart components 5 need to be embedded in the reinforcement holes 2 at the same time, and embedded every 50 to 100 cm along the height direction of the pier 1. At least three piezoelectric smart components 5 need to be ensured in the same plane. The piezoelectric smart components 5 are connected to the longitudinal pipes 4 through connecting lines 6.

[0035] The signal cable is laid in the longitudinal pipe 4 , one end of the signal cable is connected to the signal generator 7 , and the other end is connected to the piezoelectric intelligent element 5 through the connecting line 6 , and the connecting line 6 and the signal cable are tied together.

[0036] (4) Tie steel bars

[0037] Reinforcement is tied around the increased cross-section portion of the outer periphery of pier 1.

[0038] (5) Install steel formwork and pour concrete

[0039] A steel formwork 8 is placed and concrete is poured on the increased cross-section portion of the outer periphery of the pier 1, with the inner side of the steel formwork 8 being 15 to 30 cm away from the outer edge of the pier.

[0040] (6) Demolding and maintenance

[0041] (7) External PZT strain gauge

[0042] Design measuring points on the surface of the reinforced structure and paste PZT strain gauges 9. Design a group of measuring points every 50 to 100 cm along the height of the pier. A group of measuring points is at the same plane height, including at least 3 points, which are arranged at equal intervals.

[0043] (8) Signal acquisition, processing and analysis

[0044] The signal generator 7 applies an electrical excitation signal to a single or multiple piezoelectric smart elements 5. The driving piezoelectric ceramic 53 in the piezoelectric smart element 5 is driven to vibrate, and the vibration wave spreads outward. The PZT strain gauge 9 at the measuring point receives the vibration signal and converts it into an electrical signal. The electrical signal is collected by the signal acquisition system, and the collected signal is analyzed in the time domain, frequency domain, and time-frequency domain to monitor the bonding condition of the outer reinforced concrete and the old bridge pier and evaluate the reinforcement effect. The excitation-acquisition mode of single-shot single-receive, single-shot multiple-receive, and multiple-shot multiple-receive can be adopted for active monitoring.

[0045] The above-mentioned embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but the utility model is not limited to these embodiments. It should be pointed out that for ordinary technicians in this field. Under the premise of not departing from the purpose of the utility model, any improvement made shall fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A bridge pier reinforcement structure, characterized in that: The invention comprises a bridge pier (1), a reinforcement hole (2), an L-shaped steel bar (3), a pipe (4), a piezoelectric intelligent element (5), a connecting line (6), a signal generator (7), a steel template (8), a PZT strain gauge (9), and a signal acquisition system (10). The bridge pier (1) is provided with a plurality of groups of reinforcement holes (2) equidistantly arranged in a vertical direction, each group comprising a plurality of reinforcement holes (2) uniformly distributed in a circular shape along a cross section of the bridge pier (1), the L-shaped steel bar (3) being arranged in the reinforcement hole (2), the number of the pipes (4) being three and being longitudinally fixed at equal intervals along the surface of the bridge pier (1), the pipes ( 4) is provided with a signal cable, the piezoelectric intelligent element (5) is buried in the rebar hole (2), one end of the signal cable is connected to the signal generator (7), and the other end is connected to the piezoelectric intelligent element (5) through the connecting line (6), the outer periphery of the pier (1) is provided with a ring-shaped steel template (8), steel bars are tied between the inner wall of the steel template (8) and the outer wall of the pier (1), and concrete is poured to form an enlarged cross-section portion, the outer wall of the enlarged cross-section portion is pasted with the PZT strain gauge (9), and the PZT strain gauge (9) is electrically connected to the signal acquisition system (10).

2. A bridge pier reinforcement structure according to claim 1, characterized in that: The pipeline (4) is a PVC pipe.

3. The bridge pier reinforcement structure according to claim 1, characterized in that: At least three piezoelectric intelligent elements (5) are arranged on the same plane of the bridge pier (1).

4. The bridge pier reinforcement structure according to claim 1, characterized in that: The piezoelectric intelligent element (5) is composed of a driving piezoelectric ceramic (53), a waterproof layer (52) and cement-coated aggregate (51) in sequence from the inside to the outside.

5. The bridge pier reinforcement structure according to claim 4, characterized in that: The waterproof layer (52) is made of epoxy resin.

6. The bridge pier reinforcement structure according to claim 1, characterized in that: The distance between the inner wall of the steel formwork (8) and the outer wall of the pier (1) is 15-30 cm.

7. The bridge pier reinforcement structure according to claim 1, characterized in that: A group of the PZT strain gauges (9) is attached to the enlarged cross-section portion every 50-100 cm in the vertical direction of the pier (1), and each group contains at least 3 PZT strain gauges (9) equidistantly distributed in a circular shape along the outer wall of the enlarged cross-section portion.

8. The bridge pier reinforcement structure according to claim 1, characterized in that: The signal acquisition system (10) is a high-frequency signal acquisition instrument.

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