Lightweight health monitoring system suitable for pile plate type bridge

Abstract

The utility model provides a lightweight health monitoring system suitable for a pile plate type bridge. The lightweight health monitoring system comprises a sensor subsystem, a data acquisition and transmission subsystem, a health monitoring cloud network platform and a bridge early warning system, wherein a strain sensor is mounted in the midspan of a main beam, so that the stress state of a bridge structure under the action of an external load can be accurately monitored; triangular reflection points are installed in the midspan of the main beam, the non-contact deflection monitor is used for monitoring the midspan deflection of the main beam, and the space curved surface effect of the bridge under the load effect can be integrally reflected. Joint meters are mounted at longitudinal bridge joints and pile top expansion joints and can be used for monitoring tiny movement of the structure; an environment temperature sensor is mounted on the section of the support and can monitor the temperature change of the section; each sensor unit is connected with the health monitoring cloud network platform through the data acquisition and transmission unit; the health monitoring system can effectively monitor the health condition of the pile plate type bridge, visualize the real-time state and real-time monitoring data of the bridge, and judge the safety condition of the bridge structure.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge health monitoring, and in particular to a lightweight health monitoring system suitable for pile-slab bridges. Background Art

[0002] Bridge health monitoring is to provide a basis and guidance for bridge operation and maintenance management by evaluating the structural performance and safety status of bridges in real time. With the development of my country's economy and the formation of urban networks, the construction of urban highways is accelerating, and bridge safety has become an important part of traffic safety and social stability.

[0003] In recent years, the country has vigorously promoted green highway construction and put forward new requirements for highway construction. Pile-slab bridges have fast construction speed, less impact on the surrounding environment, can adapt to different geological conditions, and meet different load requirements. They are an efficient and widely used bridge structure. Pile-slab structures have begun to be gradually applied in the field of highway construction in my country. However, there are few theoretical studies on pile-slab roadbeds at home and abroad, and there are no relevant design specifications, which has brought great difficulties to the large-scale application of pile-slab roadbeds.

[0004] Establishing a health monitoring system for sheet-pile bridges not only provides a basis for the long-term safe operation and scientific maintenance of bridge structures, but also provides important data support for the design optimization of this type of structure. In view of this, a lightweight health monitoring system suitable for pile-sheet bridges has become an urgent problem to be solved. Utility Model Content

[0005] The utility model aims to provide a lightweight health monitoring system suitable for pile-slab bridges, aiming to overcome the problem that the bridge health monitoring system in the prior art basically only monitors a single parameter and cannot monitor multiple key indicators of the bridge structure in real time.

[0006] To achieve the above-mentioned purpose, the utility model proposes a lightweight health monitoring system suitable for pile-slab bridges, including a strain sensor, a joint meter, a temperature sensor, a non-contact deflection monitor, a triangular reflection point, a data acquisition and transmission unit, a health monitoring cloud network platform, and a bridge early warning system; the strain sensor, the joint meter, and the temperature sensor are electrically connected to the data acquisition and transmission unit, respectively; the data acquisition and transmission unit and the non-contact deflection monitor upload the monitoring data to the health monitoring cloud network platform, respectively, the bridge early warning system compares the data uploaded to the health monitoring cloud network platform, and when the monitoring index exceeds the threshold, a bridge structure safety early warning is issued.

[0007] As a preferred technical solution of the present application, the strain sensor includes a longitudinal strain sensor, and the longitudinal strain sensor is installed on the bottom plate surface in the middle of the main beam.

[0008] As a preferred technical solution of the present application, the strain sensor includes a transverse strain sensor, and the transverse strain sensor is installed at the bottom of the bridge deck.

[0009] As a preferred technical solution of the present application, the joint meter includes a longitudinal expansion joint joint meter, and the longitudinal expansion joint joint meter is installed between the expansion joint and the beam top.

[0010] As a preferred technical solution of the present application, the seam meter includes a transverse bridge joint seam meter, and the transverse bridge joint seam meter is installed at the longitudinal bridge joint.

[0011] As a preferred technical solution of the present application, the temperature sensor is installed on the belly surface of the support section box girder.

[0012] As a preferred technical solution of the present application, the non-contact deflection monitor is installed on the inner wall of the pier or the stable area, and the triangular reflection point is installed on the web of the mid-span box girder.

[0013] As a preferred technical solution of the present application, the triangular reflection point is installed in the middle of two adjacent bridge piers.

[0014] As a preferred technical solution of the present application, the non-contact deflection monitor has a measurement distance within 500m and a measurement accuracy of less than 0.1mm.

[0015] As a preferred technical solution of the present application, the bridge warning system sets three warning thresholds and four warning status levels based on the physical model of the bridge structure.

[0016] The utility model provides a lightweight health monitoring system suitable for pile-slab bridges. A strain sensor is installed in the middle of the main beam span, which can accurately monitor the stress state of the bridge structure under the action of external loads; a triangular reflection point is installed in the middle of the main beam span, and a non-contact deflection monitor is used to monitor the deflection of the main beam mid-span, which can overall reflect the spatial curved surface effect of the bridge under the action of loads; joint meters are installed at the longitudinal bridge joints and pile top expansion joints, which can be used to monitor small movements of the structure; an ambient temperature sensor is installed on the support cross section, which can monitor the temperature changes of the cross section; each sensor unit is connected to the health monitoring cloud network platform through a data acquisition and transmission unit.

[0017] This health monitoring system integrates multiple sensors to monitor multiple key indicators of the bridge structure in real time. It can effectively monitor its health status, visualize the real-time status and real-time monitoring data of the bridge, and determine the safety status of the bridge structure.

[0018] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a schematic diagram of sensors and equipment in the lightweight health monitoring system of the pile-slab bridge of the utility model;

[0021] Figure 2 It is a schematic diagram of the expansion joint displacement monitoring in the utility model;

[0022] Figure 3 It is a schematic diagram of the longitudinal bridge joint displacement monitoring in the utility model;

[0023] Figure 4 It is a cross-sectional view of pier 1# in the utility model;

[0024] Figure 5 It is a cross-sectional view of the 1# and 2# pier spans in the utility model;

[0025] Description of Reference Numerals

[0026] 1. Strain sensor; 2. Joint gauge; 3. Temperature sensor; 4. Non-contact deflection monitor; 5. Triangular reflection point; 6. Data acquisition and transmission unit; 7. Health monitoring cloud network platform; 8. Bridge early warning system; 101. Longitudinal strain sensor; 102. Transverse strain sensor; 201. Expansion joint longitudinal joint gauge; 202. Transverse bridge joint joint gauge. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] like Figure 1 to Figure 5 As shown, the utility model is suitable for a lightweight health monitoring system for pile-slab bridges, which is composed of a strain sensor 1, a crack meter 2, a temperature sensor 3, a non-contact deflection monitor 4, a triangular reflection point 5, a data acquisition and transmission unit 6, a health monitoring cloud network platform 7, and a bridge early warning system 8.

[0029] Among them, the strain sensor 1, the crack meter 2, and the temperature sensor 3 are electrically connected to the data acquisition and transmission unit 6 respectively; the non-contact deflection monitor 4 and multiple groups of triangular reflection points 5 constitute a non-contact deflection monitoring system for monitoring the dynamic deflection of the bridge mid-span; the data acquisition and transmission unit 6 and the non-contact deflection monitor 4 upload the monitoring data to the health monitoring cloud network platform 7 respectively; the bridge early warning system 8 combines the monitoring data and the physical model to hybrid drive and set the bridge safety threshold.

[0030] like Figure 1 , Figure 5 As shown, the strain sensor 1 includes a longitudinal strain sensor 101 and a transverse strain sensor 102. The longitudinal strain sensor 101 is installed on the lower surface of the bottom plate in the middle of the main beam span to detect the longitudinal strain state of the main beam; the transverse strain sensor 102 is installed at the bottom of the bridge deck to detect the transverse strain state of the main beam; thus, the strain state of the main beam can be judged from two dimensions. That is, the strain sensor is installed in the middle of the main beam span in this application, which can accurately monitor the stress state of the bridge structure under the action of external loads.

[0031] like Figure 1 to Figure 4 As shown, the joint meter 2 includes a longitudinal joint meter 201 for expansion joints and a transverse joint meter 202 for bridge joints. The longitudinal joint meter 201 for expansion joints is installed between the expansion joint and the top of the beam; the transverse joint meter 202 for bridge joints is installed at the longitudinal joints. That is, the present application installs joint meters at the longitudinal joints and the expansion joints at the top of the piles, which can be used to monitor the slight movement of the structure.

[0032] like Figure 1 As shown, two triangular reflection points 5 are installed at the web of the mid-span box girder, and the triangular reflection point 5 is correspondingly installed in the middle position of two adjacent piers. The non-contact deflection monitor 4 is installed on the inner wall or stable area of ​​the 3# pier. The non-contact deflection monitor 4 uses the principle of microwave interferometry to transmit microwaves to the triangular reflection point 5, calculate the phase difference between the two echoes, and estimate the target micro deformation.

[0033] The non-contact deflection monitor 4 can perform multi-target measurements simultaneously, is less affected by bad weather such as light, rain, and wind, and can be used for all-weather monitoring. The measurement distance is within 500m, and the measurement accuracy is better than 0.1mm (30m), that is: the measurement error range of the non-contact deflection monitor 4 is less than 0.1mm per 30m.

[0034] In addition, if Figure 1 As shown, the temperature sensor 3 is installed on the belly surface of the support section box girder to detect the surface temperature of the upper surface of the belly of the support section box girder and the main beam.

[0035] The health monitoring cloud network platform 7 can view the measurement point information, draw the monitoring data curve, and visualize the structural status through the lightweight BIM model. The bridge early warning system 8 sets a multi-level early warning threshold based on the physical model of the bridge structure, and compares it with the strain and displacement data uploaded to the health monitoring cloud network platform 7. When the monitoring index exceeds the threshold, a bridge structure safety early warning is issued.

[0036] The bridge warning system 8 is provided with 3 warning thresholds and 4 warning status levels, and the warning statuses are normal status-green, level 1 warning-blue, level 2 warning-yellow, and level 3 warning-red. The normal status indicates that the structure is very safe; the level 1 warning indicates that a small part of the sensor monitoring data exceeds the level 1 warning threshold, but does not exceed the level 2 warning threshold, and the pile-type roadbed can quickly return to normal; the level 2 warning indicates that most of the sensor monitoring data exceeds the level 1 warning threshold, and the pile-plate roadbed is partially damaged, requiring temporary road control, and sending professionals to the site for local safety assessment. Eliminating the cause of the sensor failure, the level 3 warning indicates that the pile-plate roadbed has serious structural damage, and vehicles should be stopped immediately, reported to the superior department, and the safety assessment of the entire bridge should be conducted.

[0037] The working principle and working process of the lightweight health monitoring system suitable for pile-slab bridges of the utility model are briefly described below.

[0038] The utility model provides a lightweight health monitoring system suitable for pile-slab bridges. A strain sensor is installed in the middle of the main beam span, which can accurately monitor the stress state of the bridge structure under the action of external loads; a triangular reflection point is installed in the middle of the main beam span, and a non-contact deflection monitor is used to monitor the deflection of the main beam mid-span, which can overall reflect the spatial curved surface effect of the bridge under the action of loads; joint meters are installed at the longitudinal bridge joints and pile top expansion joints, which can be used to monitor small movements of the structure; an ambient temperature sensor is installed on the support cross section, which can monitor the temperature changes of the cross section; each sensor unit is connected to the health monitoring cloud network platform through a data acquisition and transmission unit.

[0039] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lightweight health monitoring system suitable for pile-slab bridges, characterized in that: It includes a strain sensor (1), a crack meter (2), a temperature sensor (3), a non-contact deflection monitor (4), a triangular reflection point (5), a data acquisition and transmission unit (6), a health monitoring cloud network platform (7), and a bridge early warning system (8); The strain sensor (1), the crack meter (2), and the temperature sensor (3) are electrically connected to the data acquisition and transmission unit (6), respectively; the data acquisition and transmission unit (6) and the non-contact deflection monitor (4) upload the monitoring data to the health monitoring cloud network platform (7), respectively; the bridge early warning system (8) compares the data uploaded to the health monitoring cloud network platform (7), and issues a bridge structure safety early warning when the monitoring index exceeds a threshold.

2. The lightweight health monitoring system for pile-slab bridges according to claim 1 is characterized in that: The strain sensor (1) comprises a longitudinal strain sensor (101), and the longitudinal strain sensor (101) is installed on the surface of the bottom plate in the middle of the main beam span.

3. The lightweight health monitoring system for pile-slab bridges according to claim 1 is characterized in that: The strain sensor (1) comprises a transverse strain sensor (102), and the transverse strain sensor (102) is installed at the bottom of the bridge deck.

4. The lightweight health monitoring system for pile-slab bridges according to claim 1, characterized in that: The joint meter (2) comprises a longitudinal expansion joint joint meter (201), and the longitudinal expansion joint joint meter (201) is installed between the expansion joint and the beam top.

5. The lightweight health monitoring system for pile-slab bridges according to claim 1, characterized in that: The seam meter (2) comprises a transverse bridge joint seam meter (202), and the transverse bridge joint seam meter (202) is installed at the longitudinal bridge joint.

6. The lightweight health monitoring system for pile-slab bridges according to claim 1, characterized in that: The temperature sensor (3) is installed on the belly surface of the support cross-section box beam.

7. The lightweight health monitoring system for pile-slab bridges according to claim 1, characterized in that: The non-contact deflection monitor (4) is installed on the inner wall of the pier or the stable area, and the triangular reflection point (5) is installed on the web of the box girder in the middle of the span.

8. The lightweight health monitoring system for pile-slab bridges according to claim 7, characterized in that: The triangular reflection point (5) is installed in the middle of two adjacent bridge piers.

9. The lightweight health monitoring system for pile-slab bridges according to claim 1, characterized in that: The non-contact deflection monitor (4) has a measurement distance within a range of 500m and a measurement accuracy of less than 0.1mm.

10. The lightweight health monitoring system for pile-slab bridges according to claim 1, characterized in that: The bridge early warning system (8) sets three early warning thresholds and four early warning status levels based on the physical model of the bridge structure.

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