Bridge external prestressed tendon damage vibration signal detection head and system thereof

Abstract

The utility model discloses a bridge external prestressed tendon damage vibration signal detection head and a system thereof, belonging to the technical field of bridge damage vibration signal detection. According to the vibration signal receiving mechanism, at least three piezoelectric acceleration sensors used for capturing cable vibration signals in real time are arranged on the inner surfaces of the two sides of an opening of an annular support in the circumferential direction with the center point of the annular support at equal angles. And the data acquisition and transmission mechanism is mounted on the annular bracket, is electrically connected with the vibration signal receiving mechanism, and is used for receiving the vibration signal transmitted by the vibration signal receiving mechanism and transmitting the vibration signal to an external remote monitoring terminal. The device can more accurately and efficiently capture damage vibration signal data of the external prestressed tendon, and is ingenious and compact in structure and convenient to install and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge damage vibration signal detection, and in particular relates to a bridge external prestressed tendon damage vibration signal detection head and a system thereof. Background Art

[0002] Prestressed concrete beam segment prefabrication and assembly technology is one of the key technologies for the development of industrialized bridge construction. It modularizes prestressed concrete bridges, divides the structure into several standard segments, and prefabricates them in a standardized factory. After maintenance, the segments are transported to the bridge construction site and assembled into an integral bridge span by applying prestress.

[0003] In the prefabrication and assembly of the external prestressed box girder structure across the bridge segment, the joints are made of epoxy resin composite shear key teeth, and the steering block is a crossbeam. In the prefabricated segmental beam, the external prestressed tendons are the most critical load-bearing components of the structure, and their working performance directly affects the safety of the bridge structure. It is crucial to evaluate and analyze the service performance of the external prestressed prefabricated segmental beams by comprehensively considering the structural stress characteristics and combining the problems encountered in the actual design, construction, and operation of the segmental beams of the bridge.

[0004] The biggest advantage of external prestressed tendons or steel strands is that they are outside the concrete structure and can be inspected regularly to understand the vibration frequency changes of the tendons or steel strands, and to collect technical data for future damage detection or wire replacement of external prestressed steel strands. Existing damage detection of external prestressed tendons of bridges often relies on regular manual inspections or simple instrument measurements, which may not be able to monitor the damage changes of prestressed tendons in real time and accurately, and traditional detection equipment and methods may be costly, inefficient, and difficult to achieve remote monitoring. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a bridge external prestressed tendon damage vibration signal detection head and a system thereof, which can more accurately and efficiently capture the damage vibration signal data of the external prestressed tendons, has a smart and compact structure, and is easy to install and use.

[0006] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0007] In a first aspect, the utility model provides a bridge external prestressed tendon damage vibration signal detection head, comprising:

[0008] The ring-shaped bracket is in the shape of an embracing open ring;

[0009] A vibration signal receiving mechanism, wherein at least three piezoelectric acceleration sensors for real-time capture of cable vibration signals are arranged on the inner surfaces of both sides of the opening of the annular support at equal angles to the center point of the annular support along the circumferential direction;

[0010] A data acquisition and transmission mechanism is installed on the annular bracket and is electrically connected to the vibration signal receiving mechanism, and is used to receive the vibration signal transmitted by the vibration signal receiving mechanism and transmit it to an external remote monitoring terminal.

[0011] Furthermore, at the free ends on both sides of the opening of the annular bracket, a resilient clamping guard plate made of spring steel or shape memory alloy is respectively provided, and the inner side of the clamping guard plate is configured with a first anti-slip block having a corrugated or serrated surface.

[0012] Furthermore, the annular bracket includes a first clamping portion in a semi-circular ring shape, and two arc-shaped second clamping portions are respectively detachably connected to both ends of the first clamping portion, and a clamping guard plate is provided at the free end of the second clamping portion.

[0013] Furthermore, on both end faces of the annular bottom of the annular bracket, an inner arc-shaped fixing arc plate is respectively provided, and the inner side of the fixing arc plate is configured with a second anti-slip block having a corrugated or serrated surface.

[0014] Furthermore, a plurality of cavity grooves for detachably installing the piezoelectric acceleration sensor are circumferentially arranged on the inner side surface of the annular bracket, and the top end of the piezoelectric acceleration sensor protrudes out of the cavity groove.

[0015] Furthermore, a buffer rubber strip is circumferentially arranged at the top end and the bottom end of the inner side surface of the annular bracket respectively.

[0016] Furthermore, the data acquisition and transmission mechanism is arranged at the arc-shaped bottom end of the first clamping portion.

[0017] In a second aspect, the present utility model provides a detection system for damage signals of external prestressed tendons of a bridge, including:

[0018] A bridge chamber;

[0019] External prestressed tendons are arranged in the bridge chamber;

[0020] A plurality of detection heads for damage vibration signals of external prestressed tendons of a bridge as described in any one of the first aspect, and the detection heads are at least arranged at the anchorage end, the turning end, the horizontal free section and the inclined free section of the external prestressed tendons;

[0021] An external remote monitoring terminal is communicatively connected to the data acquisition and transmission mechanism of the detection head.

[0022] Compared with the prior art, the beneficial effects achieved by the present utility model:

[0023] The utility model adopts a vibration signal detection head for external prestressed tendons of bridges, which is composed of a ring-shaped bracket, a vibration signal receiving mechanism (piezoelectric acceleration sensor), a data acquisition and transmission mechanism, and structural components such as a rebound force clamping guard plate and anti-sliding blocks. It can capture the vibration signals of external prestressed tendons in real time and transmit them to a remote monitoring terminal. At the same time, a damage signal detection system for external prestressed tendons of bridges is constructed, including a bridge chamber, external prestressed tendons, multiple detection heads, and an external remote monitoring terminal, which can monitor and collect data on key parts such as the anchorage end, turning end, horizontal free section, and inclined free section of external prestressed tendons, helping to accurately locate the damage position. Moreover, both the provided detection head and detection system are dexterously designed in structure, easy to assemble and use, and convenient to operate. Description of the Drawings

[0024] Figure 1 Fig. is a three-dimensional schematic diagram of a vibration signal detection head for external prestressed tendons of bridges provided according to an embodiment of the utility model;

[0025] Figure 2 Fig. is an oblique three-dimensional schematic diagram of a vibration signal detection head for external prestressed tendons of bridges provided according to an embodiment of the utility model;

[0026] Figure 3 Fig. is a schematic diagram of the use state of a vibration signal detection head for external prestressed tendons of bridges provided according to an embodiment of the utility model;

[0027] Figure 4 Fig. is a three-dimensional schematic diagram of a damage signal detection system for external prestressed tendons of bridges provided according to an embodiment of the utility model.

[0028] In the figure:

[0029] 1. First clamping part; 2. Second clamping part; 3. Clamping guard plate; 4. First anti-sliding block; 5. Fixed arc plate; 6. Second anti-sliding block; 7. Buffer rubber strip; 8. Vibration signal receiving mechanism; 9. Data acquisition and transmission mechanism; 10. Chamber; 11. External prestressed tendon; 12. External remote monitoring terminal; 13. Detection head. Detailed Embodiment

[0030] The following further describes the utility model with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the utility model and cannot be used to limit the protection scope of the utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0033] As Figure 1 、 Figure 2 and Figure 3 shown, in the embodiment of the present utility model, a vibration signal detection head for damage of external prestressed tendons of a bridge is provided, including:

[0034] A ring-shaped bracket, which is in a ring shape with an opening.

[0035] A vibration signal receiving mechanism 8, on the inner surfaces on both sides of the opening of the ring-shaped bracket, at least three piezoelectric acceleration sensors for capturing the vibration signals of the cable in real time are arranged circumferentially at equal angles with the center point of the ring-shaped bracket.

[0036] A data acquisition and transmission mechanism 9, which is installed on the ring-shaped bracket and is electrically connected to the vibration signal receiving mechanism 8, is used to receive the vibration signals transmitted by the vibration signal receiving mechanism 8 and transmit them to an external remote monitoring terminal 12.

[0037] In this embodiment, at the free ends on both sides of the opening of the ring-shaped bracket, a rebound force type clamping guard plate 3 made of spring steel or memory alloy is respectively arranged, and a first anti-slip block 4 with a corrugated or serrated surface is arranged on the inner side of the clamping guard plate 3.

[0038] The annular bracket includes a first clamping part 1 in a semi-circular ring shape. At both ends of the first clamping part 1, an arc-shaped second clamping part 2 is detachably connected respectively. At the free end of the second clamping part 2, a clamping guard plate 3 is provided.

[0039] On both end faces of the annular bottom of the annular bracket, an inner arc-shaped fixed arc plate 5 is respectively provided. On the inner side of the fixed arc plate 5, a second anti-slip block 6 with a corrugated or serrated surface is configured.

[0040] On the inner side surface of the annular bracket, a plurality of cavities for detachably installing a piezoelectric acceleration sensor are arranged along the circumferential direction, and the top end of the piezoelectric acceleration sensor protrudes out of the cavity.

[0041] On the top end and the bottom end of the inner side surface of the annular bracket, a buffer rubber strip 7 is respectively arranged along the circumferential direction.

[0042] The data acquisition and transmission mechanism 9 is embedded or placed in the arc-shaped bottom end structure of the first clamping part 1.

[0043] As Figure 4 shown, in the embodiment of the present utility model, a damage signal detection system for external prestressed tendons of a bridge is further provided, including:

[0044] A bridge box chamber 10;

[0045] External prestressed tendons 11, arranged in the bridge box chamber 10;

[0046] A number of damage vibration signal detection heads 13 for external prestressed tendons of a bridge as described in any item of the first aspect, and the detection heads 13 are at least arranged at the anchorage end, the steering end, the horizontal free section and the inclined free section of the external prestressed tendons;

[0047] An external remote monitoring terminal 12, which is communicatively connected with the data acquisition and transmission mechanism 9 of the detection head.

[0048] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present utility model.

Claims

1. A bridge external prestressed tendon damage vibration signal detector, characterized in that: include: The ring-shaped bracket is in the shape of an embracing open ring; A vibration signal receiving mechanism, wherein at least three piezoelectric acceleration sensors for real-time capture of cable vibration signals are arranged on the inner surfaces of both sides of the opening of the annular support at equal angles to the center point of the annular support along the circumferential direction; The data acquisition and transmission mechanism is installed on the annular bracket and is electrically connected to the vibration signal receiving mechanism, and is used to receive the vibration signal transmitted by the vibration signal receiving mechanism and transmit it to an external remote monitoring terminal.

2. The bridge external prestressed tendon damage vibration signal detector according to claim 1 is characterized in that: A rebound force type clamping guard plate made of spring steel or memory alloy is respectively arranged at the free ends on both sides of the opening of the annular bracket, and a first anti-sliding block with a corrugated or serrated surface is arranged on the inner side of the clamping guard plate.

3. The bridge external prestressed tendon damage vibration signal detector according to claim 2 is characterized in that: The annular bracket includes a first semicircular embracing portion, both ends of the first embracing portion are detachably connected to a second arc-shaped embracing portion, and a clamping guard plate is arranged at the free end of the second embracing portion.

4. The bridge external prestressed tendon damage vibration signal detector according to claim 2, characterized in that: An inner arc-shaped fixed arc plate is respectively arranged on the end surfaces on both sides of the annular bottom of the annular bracket, and a second anti-sliding block with a corrugated or serrated surface is arranged on the inner side of the fixed arc plate.

5. The bridge external prestressed tendon damage vibration signal detector according to claim 1, characterized in that: The inner side surface of the annular support is provided with a plurality of grooves along the circumferential direction for disassembling and placing the piezoelectric acceleration sensor, and the top end of the piezoelectric acceleration sensor protrudes from the groove.

6. The bridge external prestressed tendon damage vibration signal detector according to claim 5, characterized in that: A buffer rubber strip is respectively arranged along the circumferential direction at the top and bottom ends of the inner side surface of the annular bracket.

7. The bridge external prestressed tendon damage vibration signal detector according to claim 3, characterized in that: The data acquisition and transmission mechanism is arranged at the arc-shaped bottom end of the first embracing portion.

8. A vibration signal detection system for damage to external prestressed tendons of bridges, characterized in that: include: bridge box room; External prestressed tendons are installed inside the bridge box; A plurality of vibration signal detectors for damage to the external prestressed tendons of the bridge according to any one of claims 1 to 7, wherein the detectors are at least arranged at the anchor end, the turning end, the horizontal free section and the oblique free section of the external prestressed tendons; The external remote monitoring terminal is communicatively connected with the data acquisition and transmission mechanism of the detection head.

Images